//
// validate our input
//
static void s_PngReadValidate(png_structp png_ptr,
png_infop info_ptr,
size_t& width,
size_t& height,
size_t& depth,
size_t& x, size_t& y, size_t& w, size_t& h)
{
// store and validate our image's parameters
width = png_get_image_width(png_ptr, info_ptr);
height = png_get_image_height(png_ptr, info_ptr);
depth = png_get_channels(png_ptr, info_ptr);
png_byte color_type = png_get_color_type(png_ptr, info_ptr);
png_byte bit_depth = png_get_bit_depth(png_ptr, info_ptr);
// we support only RGB and RGBA images
if ( color_type != PNG_COLOR_TYPE_RGB &&
color_type != PNG_COLOR_TYPE_RGB_ALPHA ) {
string msg("CImageIOPng::ReadImage(): unhandled color type: ");
msg += NStr::NumericToString((int)color_type);
NCBI_THROW(CImageException, eReadError, msg);
}
// ...and only with a bit depth of 8
if (bit_depth != 8) {
string msg("CImageIOPng::ReadImage(): unhandled bit depth: ");
msg += NStr::NumericToString((int)bit_depth);
NCBI_THROW(CImageException, eReadError, msg);
}
// this goes along with RGB or RGBA
if (depth != 3 && depth != 4) {
string msg("CImageIOPng::ReadImage(): unhandled image channels: ");
msg += NStr::NumericToString((int)depth);
NCBI_THROW(CImageException, eReadError, msg);
}
if (x != (size_t)-1 && y != (size_t)-1 &&
w != (size_t)-1 && h != (size_t)-1) {
// further validation: make sure we're actually on the image
if (x >= width || y >= height) {
string msg("CImageIOPng::ReadImage(): invalid starting position: ");
msg += NStr::NumericToString(x);
msg += ", ";
msg += NStr::NumericToString(y);
NCBI_THROW(CImageException, eReadError, msg);
}
// clamp our width and height to the image size
if (x + w >= width) {
w = width - x;
LOG_POST_X(27, Warning
<< "CImageIOPng::ReadImage(): clamped width to " << w);
}
if (y + h >= height) {
h = height - y;
LOG_POST_X(28, Warning
<< "CImageIOPng::ReadImage(): clamped height to " << h);
}
}
png_read_update_info(png_ptr, info_ptr);
}
static void read_png_file_low(const char* file_name, png_image_data_t *png_image_data)
{
png_structp png_ptr;
int number_of_passes;
char header[8]; // 8 is the maximum size that can be checked
int y;
/* open file and test for it being a png */
FILE *fp = fopen(file_name, "rb");
if (!fp)
abort_("[read_png_file] File %s could not be opened for reading", file_name);
fread(header, 1, 8, fp);
if (png_sig_cmp(header, 0, 8))
abort_("[read_png_file] File %s is not recognized as a PNG file", file_name);
/* initialize stuff */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
abort_("[read_png_file] png_create_read_struct failed");
png_image_data->info_ptr = png_create_info_struct(png_ptr);
if (!png_image_data->info_ptr)
abort_("[read_png_file] png_create_info_struct failed");
if (setjmp(png_jmpbuf(png_ptr)))
abort_("[read_png_file] Error during init_io");
png_init_io(png_ptr, fp);
png_set_sig_bytes(png_ptr, 8); /* 8 == sig_read ? */
png_read_info(png_ptr, png_image_data->info_ptr);
/* set transformations */
/*
if ((png_image_data->info_ptr->color_type & PNG_COLOR_TYPE_RGB) == 0)
transforms |= PNG_TRANSFORM_BGR;
*/
if (png_get_valid(png_ptr, png_image_data->info_ptr, PNG_INFO_sBIT))
{
png_color_8p sig_bit;
png_get_sBIT(png_ptr, png_image_data->info_ptr, &sig_bit);
printf("sig_bit: %d\n", sig_bit);
png_set_shift(png_ptr, sig_bit);
}
/* TODO DFG: is this needed? */
number_of_passes = png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, png_image_data->info_ptr);
/* read file */
if (setjmp(png_jmpbuf(png_ptr)))
abort_("[read_png_file] Error during read_image");
#if 1
png_image_data->row_pointers = (png_bytep*) qemu_malloc(sizeof(png_bytep) * png_image_data->info_ptr->height);
for (y=0; y < png_image_data->info_ptr->height; y++)
png_image_data->row_pointers[y] = (png_byte*) qemu_malloc(png_image_data->info_ptr->rowbytes);
png_read_image(png_ptr, png_image_data->row_pointers);
#endif
/* DFG TODO: Cleanup */
/* png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL); */
fclose(fp);
}
void PNGImageDecoder::headerAvailable()
{
png_structp png = m_reader->pngPtr();
png_infop info = m_reader->infoPtr();
png_uint_32 width = png_get_image_width(png, info);
png_uint_32 height = png_get_image_height(png, info);
// Protect against large images.
if (width > cMaxPNGSize || height > cMaxPNGSize) {
longjmp(JMPBUF(png), 1);
return;
}
// We can fill in the size now that the header is available. Avoid memory
// corruption issues by neutering setFailed() during this call; if we don't
// do this, failures will cause |m_reader| to be deleted, and our jmpbuf
// will cease to exist. Note that we'll still properly set the failure flag
// in this case as soon as we longjmp().
m_doNothingOnFailure = true;
bool result = setSize(width, height);
m_doNothingOnFailure = false;
if (!result) {
longjmp(JMPBUF(png), 1);
return;
}
int bitDepth, colorType, interlaceType, compressionType, filterType, channels;
png_get_IHDR(png, info, &width, &height, &bitDepth, &colorType, &interlaceType, &compressionType, &filterType);
// The options we set here match what Mozilla does.
// Expand to ensure we use 24-bit for RGB and 32-bit for RGBA.
if (colorType == PNG_COLOR_TYPE_PALETTE || (colorType == PNG_COLOR_TYPE_GRAY && bitDepth < 8))
png_set_expand(png);
png_bytep trns = 0;
int trnsCount = 0;
if (png_get_valid(png, info, PNG_INFO_tRNS)) {
png_get_tRNS(png, info, &trns, &trnsCount, 0);
png_set_expand(png);
}
if (bitDepth == 16)
png_set_strip_16(png);
if (colorType == PNG_COLOR_TYPE_GRAY || colorType == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
if ((colorType & PNG_COLOR_MASK_COLOR) && !m_ignoreGammaAndColorProfile) {
// We only support color profiles for color PALETTE and RGB[A] PNG. Supporting
// color profiles for gray-scale images is slightly tricky, at least using the
// CoreGraphics ICC library, because we expand gray-scale images to RGB but we
// do not similarly transform the color profile. We'd either need to transform
// the color profile or we'd need to decode into a gray-scale image buffer and
// hand that to CoreGraphics.
readColorProfile(png, info, m_colorProfile);
#if USE(QCMSLIB)
bool decodedImageHasAlpha = (colorType & PNG_COLOR_MASK_ALPHA) || trnsCount;
m_reader->createColorTransform(m_colorProfile, decodedImageHasAlpha);
m_colorProfile.clear();
#endif
}
// Deal with gamma and keep it under our control.
double gamma;
if (!m_ignoreGammaAndColorProfile && png_get_gAMA(png, info, &gamma)) {
if ((gamma <= 0.0) || (gamma > cMaxGamma)) {
gamma = cInverseGamma;
png_set_gAMA(png, info, gamma);
}
png_set_gamma(png, cDefaultGamma, gamma);
} else
png_set_gamma(png, cDefaultGamma, cInverseGamma);
// Tell libpng to send us rows for interlaced pngs.
if (interlaceType == PNG_INTERLACE_ADAM7)
png_set_interlace_handling(png);
// Update our info now.
png_read_update_info(png, info);
channels = png_get_channels(png, info);
ASSERT(channels == 3 || channels == 4);
m_reader->setHasAlpha(channels == 4);
if (m_reader->decodingSizeOnly()) {
// If we only needed the size, halt the reader.
#if defined(PNG_LIBPNG_VER_MAJOR) && defined(PNG_LIBPNG_VER_MINOR) && (PNG_LIBPNG_VER_MAJOR > 1 || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 5))
// '0' argument to png_process_data_pause means: Do not cache unprocessed data.
m_reader->setReadOffset(m_reader->currentBufferSize() - png_process_data_pause(png, 0));
#else
m_reader->setReadOffset(m_reader->currentBufferSize() - png->buffer_size);
png->buffer_size = 0;
#endif
}
}
SDL_Surface *IMG_LoadPNG_RW(SDL_RWops *src)
{
SDL_Surface *volatile surface;
png_structp png_ptr;
png_infop info_ptr;
png_uint_32 width, height;
int bit_depth, color_type, interlace_type;
Uint32 Rmask;
Uint32 Gmask;
Uint32 Bmask;
Uint32 Amask;
SDL_Palette *palette;
png_bytep *volatile row_pointers;
int row, i;
volatile int ckey = -1;
png_color_16 *transv;
/* Initialize the data we will clean up when we're done */
png_ptr = NULL; info_ptr = NULL; row_pointers = NULL; surface = NULL;
/* Check to make sure we have something to do */
if ( ! src ) {
goto done;
}
/* Create the PNG loading context structure */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL,NULL,NULL);
if (png_ptr == NULL){
IMG_SetError("Couldn't allocate memory for PNG file");
goto done;
}
/* Allocate/initialize the memory for image information. REQUIRED. */
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
IMG_SetError("Couldn't create image information for PNG file");
goto done;
}
/* Set error handling if you are using setjmp/longjmp method (this is
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in png_create_read_struct() earlier.
*/
if ( setjmp(png_ptr->jmpbuf) ) {
IMG_SetError("Error reading the PNG file.");
goto done;
}
/* Set up the input control */
png_set_read_fn(png_ptr, src, png_read_data);
/* Read PNG header info */
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
&color_type, &interlace_type, NULL, NULL);
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
png_set_strip_16(png_ptr) ;
/* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
* byte into separate bytes (useful for paletted and grayscale images).
*/
png_set_packing(png_ptr);
/* scale greyscale values to the range 0..255 */
if(color_type == PNG_COLOR_TYPE_GRAY)
png_set_expand(png_ptr);
/* For images with a single "transparent colour", set colour key;
if more than one index has transparency, or if partially transparent
entries exist, use full alpha channel */
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
int num_trans;
Uint8 *trans;
png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans,
&transv);
if(color_type == PNG_COLOR_TYPE_PALETTE) {
/* Check if all tRNS entries are opaque except one */
int i, t = -1;
for(i = 0; i < num_trans; i++)
if(trans[i] == 0) {
if(t >= 0)
break;
t = i;
} else if(trans[i] != 255)
break;
if(i == num_trans) {
/* exactly one transparent index */
ckey = t;
} else {
/* more than one transparent index, or translucency */
png_set_expand(png_ptr);
}
} else
ckey = 0; /* actual value will be set later */
}
if ( color_type == PNG_COLOR_TYPE_GRAY_ALPHA )
png_set_gray_to_rgb(png_ptr);
png_read_update_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
&color_type, &interlace_type, NULL, NULL);
/* Allocate the SDL surface to hold the image */
Rmask = Gmask = Bmask = Amask = 0 ;
if ( color_type != PNG_COLOR_TYPE_PALETTE ) {
if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) {
Rmask = 0x000000FF;
Gmask = 0x0000FF00;
Bmask = 0x00FF0000;
Amask = (info_ptr->channels == 4) ? 0xFF000000 : 0;
} else {
int s = (info_ptr->channels == 4) ? 0 : 8;
Rmask = 0xFF000000 >> s;
Gmask = 0x00FF0000 >> s;
Bmask = 0x0000FF00 >> s;
Amask = 0x000000FF >> s;
}
}
surface = SDL_AllocSurface(SDL_SWSURFACE, width, height,
bit_depth*info_ptr->channels, Rmask,Gmask,Bmask,Amask);
if ( surface == NULL ) {
IMG_SetError("Out of memory");
goto done;
}
if(ckey != -1) {
if(color_type != PNG_COLOR_TYPE_PALETTE)
/* FIXME: Should these be truncated or shifted down? */
ckey = SDL_MapRGB(surface->format,
(Uint8)transv->red,
(Uint8)transv->green,
(Uint8)transv->blue);
SDL_SetColorKey(surface, SDL_SRCCOLORKEY, ckey);
}
/* Create the array of pointers to image data */
row_pointers = (png_bytep*) malloc(sizeof(png_bytep)*height);
if ( (row_pointers == NULL) ) {
IMG_SetError("Out of memory");
SDL_FreeSurface(surface);
surface = NULL;
goto done;
}
for (row = 0; row < (int)height; row++) {
row_pointers[row] = (png_bytep)
(Uint8 *)surface->pixels + row*surface->pitch;
}
/* Read the entire image in one go */
png_read_image(png_ptr, row_pointers);
/* read rest of file, get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
/* Load the palette, if any */
palette = surface->format->palette;
if ( palette ) {
if(color_type == PNG_COLOR_TYPE_GRAY) {
palette->ncolors = 256;
for(i = 0; i < 256; i++) {
palette->colors[i].r = i;
palette->colors[i].g = i;
palette->colors[i].b = i;
}
} else if (info_ptr->num_palette > 0 ) {
palette->ncolors = info_ptr->num_palette;
for( i=0; i<info_ptr->num_palette; ++i ) {
palette->colors[i].b = info_ptr->palette[i].blue;
palette->colors[i].g = info_ptr->palette[i].green;
palette->colors[i].r = info_ptr->palette[i].red;
}
}
}
done: /* Clean up and return */
png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : (png_infopp)0,
(png_infopp)0);
if ( row_pointers ) {
free(row_pointers);
}
return(surface);
}
static gint
gegl_buffer_import_png (GeglBuffer *gegl_buffer,
GInputStream *stream,
gint dest_x,
gint dest_y,
gint *ret_width,
gint *ret_height,
const Babl *format, // can be NULL
GError **err)
{
gint width;
gint bit_depth;
gint bpp;
gint number_of_passes=1;
png_uint_32 w;
png_uint_32 h;
png_structp load_png_ptr;
png_infop load_info_ptr;
guchar *pixels;
/*png_bytep *rows;*/
unsigned int i;
png_bytep *row_p = NULL;
g_return_val_if_fail(stream, -1);
if (!check_valid_png_header(stream, err))
{
return -1;
}
load_png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, error_fn, NULL);
if (!load_png_ptr)
{
return -1;
}
load_info_ptr = png_create_info_struct (load_png_ptr);
if (!load_info_ptr)
{
png_destroy_read_struct (&load_png_ptr, &load_info_ptr, NULL);
return -1;
}
if (setjmp (png_jmpbuf (load_png_ptr)))
{
png_destroy_read_struct (&load_png_ptr, &load_info_ptr, NULL);
g_free (row_p);
return -1;
}
png_set_read_fn(load_png_ptr, stream, read_fn);
png_set_sig_bytes (load_png_ptr, 8); // we already read header
png_read_info (load_png_ptr, load_info_ptr);
{
int color_type;
int interlace_type;
png_get_IHDR (load_png_ptr,
load_info_ptr,
&w, &h,
&bit_depth,
&color_type,
&interlace_type,
NULL, NULL);
width = w;
if (ret_width)
*ret_width = w;
if (ret_height)
*ret_height = h;
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
{
png_set_expand (load_png_ptr);
bit_depth = 8;
}
if (png_get_valid (load_png_ptr, load_info_ptr, PNG_INFO_tRNS))
{
png_set_tRNS_to_alpha (load_png_ptr);
color_type |= PNG_COLOR_MASK_ALPHA;
}
switch (color_type)
{
case PNG_COLOR_TYPE_GRAY:
bpp = 1;
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
bpp = 2;
break;
case PNG_COLOR_TYPE_RGB:
bpp = 3;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
bpp = 4;
break;
case (PNG_COLOR_TYPE_PALETTE | PNG_COLOR_MASK_ALPHA):
bpp = 4;
break;
case PNG_COLOR_TYPE_PALETTE:
bpp = 3;
break;
default:
g_warning ("color type mismatch");
png_destroy_read_struct (&load_png_ptr, &load_info_ptr, NULL);
return -1;
}
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb (load_png_ptr);
if (bit_depth == 16)
bpp = bpp << 1;
if (!format)
format = get_babl_format(bit_depth, color_type);
#if BYTE_ORDER == LITTLE_ENDIAN
if (bit_depth == 16)
png_set_swap (load_png_ptr);
#endif
if (interlace_type == PNG_INTERLACE_ADAM7)
number_of_passes = png_set_interlace_handling (load_png_ptr);
if (png_get_valid (load_png_ptr, load_info_ptr, PNG_INFO_gAMA))
{
gdouble gamma;
png_get_gAMA (load_png_ptr, load_info_ptr, &gamma);
png_set_gamma (load_png_ptr, 2.2, gamma);
}
else
{
png_set_gamma (load_png_ptr, 2.2, 0.45455);
}
png_read_update_info (load_png_ptr, load_info_ptr);
}
pixels = g_malloc0 (width*bpp);
{
gint pass;
GeglRectangle rect;
for (pass=0; pass<number_of_passes; pass++)
{
for(i=0; i<h; i++)
{
gegl_rectangle_set (&rect, 0, i, width, 1);
if (pass != 0)
gegl_buffer_get (gegl_buffer, &rect, 1.0, format, pixels, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
png_read_rows (load_png_ptr, &pixels, NULL, 1);
gegl_buffer_set (gegl_buffer, &rect, 0, format, pixels,
GEGL_AUTO_ROWSTRIDE);
}
}
}
png_read_end (load_png_ptr, NULL);
png_destroy_read_struct (&load_png_ptr, &load_info_ptr, NULL);
g_free (pixels);
return 0;
}
static int readpng( FILE *f, GrContext *grc, int use_alpha )
{
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
png_byte buf[8];
png_byte *png_pixels = NULL;
png_byte **row_pointers = NULL;
png_byte *pix_ptr = NULL;
png_uint_32 row_bytes;
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int color_type;
int alpha_present;
int i, x, y, r, g, b;
int alpha = 0, ro, go, bo;
int maxwidth, maxheight;
GrColor *pColors = NULL;
/* is it a PNG file? */
if( fread( buf,1,8,f ) != 8 ) return -1;
if( ! png_check_sig( buf,8 ) ) return -1;
png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
if( !png_ptr ){
return -1;
}
info_ptr = png_create_info_struct( png_ptr );
if( !info_ptr ){
png_destroy_read_struct( &png_ptr,NULL,NULL );
return -1;
}
if( setjmp( png_jmpbuf(png_ptr) ) ){
png_destroy_read_struct( &png_ptr,&info_ptr,NULL );
return -1;
}
png_init_io( png_ptr,f );
png_set_sig_bytes( png_ptr,8 );
png_read_info( png_ptr,info_ptr );
png_get_IHDR( png_ptr,info_ptr,&width,&height,&bit_depth,
&color_type,NULL,NULL,NULL);
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
if( bit_depth == 16 )
png_set_strip_16( png_ptr );
/* expand paletted colors into true RGB triplets */
if( color_type == PNG_COLOR_TYPE_PALETTE )
png_set_expand( png_ptr );
/* expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
if( color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8 )
png_set_expand( png_ptr );
/* expand paletted or RGB images with transparency to full alpha channels
so the data will be available as RGBA quartets. */
if( png_get_valid( png_ptr,info_ptr,PNG_INFO_tRNS ) )
png_set_expand( png_ptr );
/* transform grayscale images into rgb */
if( color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA )
png_set_gray_to_rgb( png_ptr );
/* we don't do gamma correction by now */
png_read_update_info( png_ptr,info_ptr );
png_get_IHDR( png_ptr,info_ptr,&width,&height,&bit_depth,
&color_type,NULL,NULL,NULL);
if( color_type == PNG_COLOR_TYPE_RGB )
alpha_present = 0;
else if( color_type == PNG_COLOR_TYPE_RGB_ALPHA )
alpha_present = 1;
else{
png_destroy_read_struct( &png_ptr,&info_ptr,NULL );
return -1;
}
row_bytes = png_get_rowbytes( png_ptr,info_ptr );
png_pixels = (png_byte *) malloc( row_bytes * height * sizeof(png_byte) );
if( png_pixels == NULL ){
png_destroy_read_struct( &png_ptr,&info_ptr,NULL );
return -1;
}
row_pointers = (png_byte **) malloc( height * sizeof(png_bytep) );
if( row_pointers == NULL ){
png_destroy_read_struct( &png_ptr,&info_ptr,NULL );
free( png_pixels );
png_pixels = NULL;
return -1;
}
for( i=0; i<height; i++ )
row_pointers[i] = png_pixels + i * row_bytes;
png_read_image (png_ptr, row_pointers);
png_read_end (png_ptr, info_ptr);
png_destroy_read_struct( &png_ptr,&info_ptr,NULL );
/* write data to context */
maxwidth = (width > GrSizeX()) ? GrSizeX() : width;
maxheight = (height > GrSizeY()) ? GrSizeY() : height;
pColors = malloc( maxwidth * sizeof(GrColor) );
if( pColors == NULL ){
free( row_pointers );
row_pointers = NULL;
free( png_pixels );
png_pixels = NULL;
return -1;
}
for( y=0; y<maxheight; y++ ){
pix_ptr = row_pointers[y];
if( alpha_present && use_alpha ){
memcpy( pColors,GrGetScanline( 0,maxwidth-1,y ),
sizeof(GrColor)*maxwidth );
}
for( x=0; x<width; x++ ){
r = *pix_ptr++;
g = *pix_ptr++;
b = *pix_ptr++;
alpha = 0;
if( alpha_present )
alpha = *pix_ptr++;
if( x < maxwidth ){
if( alpha_present && use_alpha ){
if (alpha == 0) {
GrQueryColor( pColors[x],&r,&g,&b );
}
else if (alpha != 255) { // if a==255, rgb not modified
float f1, f2;
f1 = (alpha/255.0);
f2 = ((255-alpha)/255.0);
GrQueryColor( pColors[x],&ro,&go,&bo );
r = (r * f1) + (ro * f2);
g = (g * f1) + (go * f2);
b = (b * f1) + (bo * f2);
}
}
pColors[x] = GrAllocColor( r,g,b );
}
}
GrPutScanline( 0,maxwidth-1,y,pColors,GrWRITE );
}
if( pColors) free( pColors );
if( row_pointers ) free( row_pointers );
if( png_pixels ) free( png_pixels );
return 0;
}
png_byte *Texture::load(char* filename, int &width, int &height) {
png_byte header[8];
//open file as binary
FILE *fp = fopen(filename, "rb");
if (!fp) {
return TEXTURE_LOAD_ERROR;
}
//read the header
fread(header, 1, 8, fp);
//test if png
int is_png = !png_sig_cmp(header, 0, 8);
if (!is_png) {
fclose(fp);
return TEXTURE_LOAD_ERROR;
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fclose(fp);
return TEXTURE_LOAD_ERROR;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, (png_infopp) NULL, (png_infopp) NULL);
fclose(fp);
return TEXTURE_LOAD_ERROR;
}
png_infop end_info = png_create_info_struct(png_ptr);
if (!end_info) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
fclose(fp);
return (TEXTURE_LOAD_ERROR);
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
return (TEXTURE_LOAD_ERROR);
}
png_init_io(png_ptr, fp);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
int bit_depth, color_type;
png_uint_32 twidth, theight;
png_get_IHDR(png_ptr, info_ptr, &twidth, &theight, &bit_depth, &color_type, NULL, NULL, NULL);
width = twidth;
height = theight;
png_read_update_info(png_ptr, info_ptr);
int rowbytes = png_get_rowbytes(png_ptr, info_ptr);
png_byte *image_data = new png_byte[rowbytes * height];
if (!image_data) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
return TEXTURE_LOAD_ERROR;
}
png_bytep *row_pointers = new png_bytep[height];
if (!row_pointers) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
delete[] image_data;
fclose(fp);
return TEXTURE_LOAD_ERROR;
}
// Does OpenGL really need the inverted row-based format?
// Seems as it doesn't, maybe myth or rumor?
// row_pointers[height - 1 - i] = image_data + i * rowbytes;
for (int i = 0; i < height; ++i) {
row_pointers[i] = image_data + i * rowbytes;
}
png_read_image(png_ptr, row_pointers);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
delete[] row_pointers;
fclose(fp);
return image_data;
}
// *image_data_ptr should be deleted with free()
// return value of 1 == success.
int pngLoad(const char *file, int *pwidth,
int *pheight, unsigned char **image_data_ptr,
bool flip) {
FILE *infile = fopen(file, "rb");
if (!infile) {
printf("No such file: %s\n", file);
return 0;
}
/* Check for the 8-byte signature */
char sig[8]; /* PNG signature array */
int len = fread(sig, 1, 8, infile);
if (len != 8 || !png_check_sig((unsigned char *) sig, 8)) {
fclose(infile);
return 0;
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fclose(infile);
return 4; /* out of memory */
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, (png_infopp) NULL, (png_infopp) NULL);
fclose(infile);
return 4; /* out of memory */
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
fclose(infile);
return 0;
}
png_init_io(png_ptr, infile);
png_set_sig_bytes(png_ptr, 8); // we already checked the sig bytes
png_read_info(png_ptr, info_ptr);
int bit_depth=0;
int color_type=0;
png_uint_32 width=0, height=0;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, NULL, NULL, NULL);
*pwidth = (int)width;
*pheight = (int)height;
// Set up some transforms. Always load RGBA.
if (color_type & PNG_COLOR_MASK_ALPHA) {
// png_set_strip_alpha(png_ptr);
}
if (bit_depth > 8) {
png_set_strip_16(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
png_set_gray_to_rgb(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_palette_to_rgb(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_RGB) {
png_set_filler(png_ptr, 255, PNG_FILLER_AFTER);
}
// Update the png info struct.
png_read_update_info(png_ptr, info_ptr);
unsigned long rowbytes = png_get_rowbytes(png_ptr, info_ptr);
unsigned char *image_data = NULL; /* raw png image data */
if ((image_data = (unsigned char *) malloc(rowbytes * height))==NULL) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 4;
}
png_bytepp row_pointers = NULL;
if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(image_data);
image_data = NULL;
return 4;
}
if (flip) {
for (unsigned long i = 0; i < height; ++i)
row_pointers[height - 1 - i] = (png_byte *)(image_data + i*rowbytes);
} else {
for (unsigned long i = 0; i < height; ++i)
row_pointers[i] = (png_byte *)(image_data + i*rowbytes);
}
png_read_image(png_ptr, row_pointers);
free(row_pointers);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
fclose(infile);
*image_data_ptr = image_data;
return 1;
}
uint8 *readpng_get_image(uint32 *pChannels, uint32 *pRowbytes, uint32 *pWidth, uint32 *pHeight)
{
png_uint_32 width, height;
int bit_depth, color_type;
uint8 *image_data = NULL;
png_uint_32 i, rowbytes;
png_bytepp row_pointers = NULL;
/* alternatively, could make separate calls to png_get_image_width(),
* etc., but want bit_depth and color_type for later [don't care about
* compression_type and filter_type => NULLs] */
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
NULL, NULL, NULL);
*pWidth = width;
*pHeight = height;
/* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
* transparency chunks to full alpha channel; strip 16-bit-per-sample
* images to 8 bits per sample; and convert grayscale to RGB[A] */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
if (bit_depth == 16)
png_set_strip_16(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
/* all transformations have been registered; now update info_ptr data,
* get rowbytes and channels, and allocate image memory */
png_read_update_info(png_ptr, info_ptr);
*pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);
*pChannels = (int)png_get_channels(png_ptr, info_ptr);
if ((image_data = (uint8 *)malloc(rowbytes*height)) == NULL) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(image_data);
image_data = NULL;
return NULL;
}
Trace((stderr, "readpng_get_image: channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
/* set the individual row_pointers to point at the correct offsets */
for (i = 0; i < height; ++i)
row_pointers[i] = image_data + i*rowbytes;
/* now we can go ahead and just read the whole image */
png_read_image(png_ptr, row_pointers);
free(row_pointers);
row_pointers = NULL;
png_read_end(png_ptr, NULL);
return image_data;
}
static GstFlowReturn
gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
{
GstFlowReturn ret = GST_FLOW_OK;
GstCaps *caps = NULL, *res = NULL;
GstPadTemplate *templ = NULL;
gint bpc = 0, color_type;
png_uint_32 width, height;
g_return_val_if_fail (GST_IS_PNGDEC (pngdec), GST_FLOW_ERROR);
/* Get bits per channel */
bpc = png_get_bit_depth (pngdec->png, pngdec->info);
/* We don't handle 16 bits per color, strip down to 8 */
if (bpc == 16) {
GST_LOG_OBJECT (pngdec,
"this is a 16 bits per channel PNG image, strip down to 8 bits");
png_set_strip_16 (pngdec->png);
}
/* Get Color type */
color_type = png_get_color_type (pngdec->png, pngdec->info);
#if 0
/* We used to have this HACK to reverse the outgoing bytes, but the problem
* that originally required the hack seems to have been in ffmpegcolorspace's
* RGBA descriptions. It doesn't seem needed now that's fixed, but might
* still be needed on big-endian systems, I'm not sure. J.S. 6/7/2007 */
if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_bgr (pngdec->png);
#endif
/* Gray scale converted to RGB and upscaled to 8 bits */
if ((color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
(color_type == PNG_COLOR_TYPE_GRAY)) {
GST_LOG_OBJECT (pngdec, "converting grayscale png to RGB");
png_set_gray_to_rgb (pngdec->png);
if (bpc < 8) { /* Convert to 8 bits */
GST_LOG_OBJECT (pngdec, "converting grayscale image to 8 bits");
png_set_gray_1_2_4_to_8 (pngdec->png);
}
}
/* Palette converted to RGB */
if (color_type == PNG_COLOR_TYPE_PALETTE) {
GST_LOG_OBJECT (pngdec, "converting palette png to RGB");
png_set_palette_to_rgb (pngdec->png);
}
/* Update the info structure */
png_read_update_info (pngdec->png, pngdec->info);
/* Get IHDR header again after transformation settings */
png_get_IHDR (pngdec->png, pngdec->info, &width, &height,
&bpc, &pngdec->color_type, NULL, NULL, NULL);
pngdec->width = width;
pngdec->height = height;
GST_LOG_OBJECT (pngdec, "this is a %dx%d PNG image", pngdec->width,
pngdec->height);
switch (pngdec->color_type) {
case PNG_COLOR_TYPE_RGB:
GST_LOG_OBJECT (pngdec, "we have no alpha channel, depth is 24 bits");
pngdec->bpp = 24;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
GST_LOG_OBJECT (pngdec, "we have an alpha channel, depth is 32 bits");
pngdec->bpp = 32;
break;
default:
GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),
("pngdec does not support this color type"));
ret = GST_FLOW_NOT_SUPPORTED;
goto beach;
}
caps = gst_caps_new_simple ("video/x-raw-rgb",
"width", G_TYPE_INT, pngdec->width,
"height", G_TYPE_INT, pngdec->height,
"bpp", G_TYPE_INT, pngdec->bpp,
"framerate", GST_TYPE_FRACTION, pngdec->fps_n, pngdec->fps_d, NULL);
templ = gst_static_pad_template_get (&gst_pngdec_src_pad_template);
res = gst_caps_intersect (caps, gst_pad_template_get_caps (templ));
gst_caps_unref (caps);
gst_object_unref (templ);
if (!gst_pad_set_caps (pngdec->srcpad, res))
ret = GST_FLOW_NOT_NEGOTIATED;
GST_DEBUG_OBJECT (pngdec, "our caps %" GST_PTR_FORMAT, res);
gst_caps_unref (res);
/* Push a newsegment event */
if (pngdec->need_newsegment) {
gst_pad_push_event (pngdec->srcpad,
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0));
pngdec->need_newsegment = FALSE;
}
beach:
return ret;
}
bool PngDecoder::readData( Mat& img )
{
volatile bool result = false;
AutoBuffer<uchar*> _buffer(m_height);
uchar** buffer = _buffer;
int color = img.channels() > 1;
if( m_png_ptr && m_info_ptr && m_end_info && m_width && m_height )
{
png_structp png_ptr = (png_structp)m_png_ptr;
png_infop info_ptr = (png_infop)m_info_ptr;
png_infop end_info = (png_infop)m_end_info;
if( setjmp( png_jmpbuf ( png_ptr ) ) == 0 )
{
int y;
if( img.depth() == CV_8U && m_bit_depth == 16 )
png_set_strip_16( png_ptr );
else if( !isBigEndian() )
png_set_swap( png_ptr );
if(img.channels() < 4)
{
/* observation: png_read_image() writes 400 bytes beyond
* end of data when reading a 400x118 color png
* "mpplus_sand.png". OpenCV crashes even with demo
* programs. Looking at the loaded image I'd say we get 4
* bytes per pixel instead of 3 bytes per pixel. Test
* indicate that it is a good idea to always ask for
* stripping alpha.. 18.11.2004 Axel Walthelm
*/
png_set_strip_alpha( png_ptr );
}
if( m_color_type == PNG_COLOR_TYPE_PALETTE )
png_set_palette_to_rgb( png_ptr );
if( m_color_type == PNG_COLOR_TYPE_GRAY && m_bit_depth < 8 )
#if (PNG_LIBPNG_VER_MAJOR*10000 + PNG_LIBPNG_VER_MINOR*100 + PNG_LIBPNG_VER_RELEASE >= 10209) || \
(PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR == 0 && PNG_LIBPNG_VER_RELEASE >= 18)
png_set_expand_gray_1_2_4_to_8( png_ptr );
#else
png_set_gray_1_2_4_to_8( png_ptr );
#endif
if( CV_MAT_CN(m_type) > 1 && color )
png_set_bgr( png_ptr ); // convert RGB to BGR
else if( color )
png_set_gray_to_rgb( png_ptr ); // Gray->RGB
else
png_set_rgb_to_gray( png_ptr, 1, 0.299, 0.587 ); // RGB->Gray
png_set_interlace_handling( png_ptr );
png_read_update_info( png_ptr, info_ptr );
for( y = 0; y < m_height; y++ )
buffer[y] = img.data + y*img.step;
png_read_image( png_ptr, buffer );
png_read_end( png_ptr, end_info );
result = true;
}
}
close();
return result;
}
gfx_t *gfx_load_png(char *filename) {
gfx_t *gfx = 0;
int i, x, y;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_infop end_info = NULL;
png_uint_32 width, height, rowbytes;
int bit_depth, color_type;
png_byte *image_data = 0;
png_bytep *row_pointers = 0;
uint8_t sig[8];
FILE *infile;
infile = fopen(filename, "rb");
if (!infile) {
fprintf(stderr, "cant open `%s`\n", filename);
return 0;
}
if (0) {
fail:
if (gfx) free(gfx);
if (image_data) free(image_data);
if (row_pointers) free(row_pointers);
fclose(infile);
return 0;
}
fread(sig, 1, 8, infile);
if (!png_check_sig(sig, 8)) {
fprintf(stderr, "bad signature for `%s`\n", filename);
return 0;
}
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fprintf(stderr, "png_create_info_struct: out of memory for `%s`\n", filename);
goto fail;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
fprintf(stderr, "png_create_info_struct: out of memory for `%s`\n", filename);
goto fail;
}
end_info = png_create_info_struct(png_ptr);
if (!end_info) {
fprintf(stderr, "error: png_create_info_struct returned 0.\n");
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
goto fail;
}
// setjmp() must be called in every function that calls a PNG-reading libpng function
if (setjmp(png_jmpbuf(png_ptr))) {
jmpbuf_fail:
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
goto fail;
}
png_init_io(png_ptr, infile);
png_set_sig_bytes(png_ptr, 8); // tell libpng that we already read the 8 signature bytes
png_read_info(png_ptr, info_ptr); // read all PNG info up to image data
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, NULL, NULL, NULL);
png_read_update_info(png_ptr, info_ptr);
rowbytes = png_get_rowbytes(png_ptr, info_ptr);
image_data = malloc(rowbytes * height * sizeof(png_byte)+15);
if (!image_data) {
fprintf(stderr, "load_png: could not allocate memory for PNG image data\n");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
goto jmpbuf_fail;
}
row_pointers = malloc(height * sizeof(png_bytep));
if (!row_pointers) {
fprintf(stderr, "load_png: could not allocate memory for PNG row pointers\n");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
goto jmpbuf_fail;
}
for (y = 0; y < height; y++) {
row_pointers[height - 1 - y] = image_data + y * rowbytes;
}
png_read_image(png_ptr, row_pointers);
if (bit_depth != 8 && bit_depth != 16 && color_type != PNG_COLOR_TYPE_PALETTE) {
fprintf(stderr, "load_png: unsupported bit_depth=%d\n", bit_depth);
goto fail;
}
if (color_type == PNG_COLOR_TYPE_RGB) { //RGB
gfx = new_gfx(width, height);
if (bit_depth == 8) {
for (y = 0; y < height; y++) {
png_byte *row = row_pointers[y];
for (x = 0; x < width; x++) {
gfx_set(gfx, x, y, R8G8B8(row[0], row[1], row[2]));
row += 3;
}
}
} else {
for (y = 0; y < height; y++) {
png_byte *row = row_pointers[y];
for (x = 0; x < width; x++) {
gfx_set(gfx, x, y, R8G8B8(row[1], row[3], row[5]));
row += 6;
}
}
}
} else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
gfx = new_gfx(width, height);
if (bit_depth == 8) {
for (y = 0; y < height; y++) {
png_byte *row = row_pointers[y];
for (x = 0; x < width; x++) {
gfx_set(gfx, x, y, R8G8B8A8(row[0], row[1], row[2], 0xFF-row[3]));
row += 4;
}
}
} else {
for (y = 0; y < height; y++) {
png_byte *row = row_pointers[y];
for (x = 0; x < width; x++) {
gfx_set(gfx, x, y, R8G8B8A8(row[1], row[3], row[5], 0xFF-row[7]));
row += 8;
}
}
}
} else if (color_type == PNG_COLOR_TYPE_PALETTE) {
uint32_t cmap[GFX_CMAP_SIZE];
png_colorp palette;
int num_palette; // palette size
png_bytep trans;
int num_trans;
png_color_16p trans_values;
gfx = new_gfx(width, height);
if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette) == 0) {
fprintf(stderr, "load_png: couldn't retrieve palette\n");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
goto fail;
}
if (png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, &trans_values) == 0) {
num_trans = 0;
}
for (i = 0; i < num_palette; i++) {
int a = i < num_trans ? 0xFF - trans[i] : 0;
cmap[i] = R8G8B8A8(palette[i].red, palette[i].green, palette[i].blue, a);
}
gfx_set_cmap(gfx, cmap);
if (bit_depth == 8) {
for (y = 0; y < height; y++) {
png_byte *row = row_pointers[y];
for (x = 0; x < width; x++) {
gfx_set(gfx, x, y, row[0]);
row++;
}
}
} else if (bit_depth == 4) {
for (y = 0; y < height; y++) {
png_byte *row = row_pointers[y];
for (x = 0; x < width; ) {
png_byte c = row[0];
for (i = 4; i >=0 ; i-=4) {
gfx_set(gfx, x, y, (c>>i)&0xF);
if (++x == width) break;
}
row++;
}
}
} else if (bit_depth == 2) {
void PNGImageDecoder::headerAvailable()
{
png_structp png = reader()->pngPtr();
png_infop info = reader()->infoPtr();
png_uint_32 width = png->width;
png_uint_32 height = png->height;
// Protect against large images.
if (png->width > (png_uint_32)cMaxPNGSize || png->height > (png_uint_32)cMaxPNGSize) {
m_failed = true;
longjmp(png->jmpbuf, 1);
return;
}
// We can fill in the size now that the header is available.
if (!m_sizeAvailable) {
m_sizeAvailable = true;
m_size = IntSize(width, height);
}
int bitDepth, colorType, interlaceType, compressionType, filterType, channels;
png_get_IHDR(png, info, &width, &height, &bitDepth, &colorType,
&interlaceType, &compressionType, &filterType);
// The options we set here match what Mozilla does.
// Expand to ensure we use 24-bit for RGB and 32-bit for RGBA.
if (colorType == PNG_COLOR_TYPE_PALETTE ||
(colorType == PNG_COLOR_TYPE_GRAY && bitDepth < 8))
png_set_expand(png);
png_bytep trns = 0;
int trnsCount = 0;
if (png_get_valid(png, info, PNG_INFO_tRNS)) {
png_get_tRNS(png, info, &trns, &trnsCount, 0);
png_set_expand(png);
}
if (bitDepth == 16)
png_set_strip_16(png);
if (colorType == PNG_COLOR_TYPE_GRAY ||
colorType == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
// 1/6/10 CSidhall - Added it as a param setting option
bool gammaOn = IsGammaCorrectionActive();
if(gammaOn) {
// EA/Alex Mole: Don't bother with this as it *always* causes extra work
// which we (Criterion) never need
//// Deal with gamma and keep it under our control.
double gamma;
if (png_get_gAMA(png, info, &gamma)) {
if ((gamma <= 0.0) || (gamma > cMaxGamma)) {
gamma = cInverseGamma;
png_set_gAMA(png, info, gamma);
}
png_set_gamma(png, cDefaultGamma, gamma);
}
else
png_set_gamma(png, cDefaultGamma, cInverseGamma);
}
// Tell libpng to send us rows for interlaced pngs.
if (interlaceType == PNG_INTERLACE_ADAM7)
png_set_interlace_handling(png);
// Update our info now
png_read_update_info(png, info);
channels = png_get_channels(png, info);
assert(channels == 3 || channels == 4);
reader()->setHasAlpha(channels == 4);
if (reader()->decodingSizeOnly()) {
// If we only needed the size, halt the reader.
reader()->setReadOffset(m_data->size() - png->buffer_size);
png->buffer_size = 0;
}
}
static vita2d_texture *_vita2d_load_PNG_generic(const void *io_ptr, png_rw_ptr read_data_fn)
{
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
goto error_create_read;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
goto error_create_info;
}
png_bytep *row_ptrs = NULL;
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)0);
if (row_ptrs != NULL)
free(row_ptrs);
return NULL;
}
png_set_read_fn(png_ptr, (png_voidp)io_ptr, read_data_fn);
png_set_sig_bytes(png_ptr, PNG_SIGSIZE);
png_read_info(png_ptr, info_ptr);
unsigned int width, height;
int bit_depth, color_type;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
&color_type, NULL, NULL, NULL);
if ((color_type == PNG_COLOR_TYPE_PALETTE && bit_depth <= 8)
|| (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
|| png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)
|| (bit_depth == 16)) {
png_set_expand(png_ptr);
}
if (bit_depth == 16)
png_set_scale_16(png_ptr);
if (bit_depth == 8 && color_type == PNG_COLOR_TYPE_RGB)
png_set_filler(png_ptr, 0xFF, PNG_FILLER_AFTER);
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_palette_to_rgb(png_ptr);
png_set_filler(png_ptr, 0xFF, PNG_FILLER_AFTER);
}
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand_gray_1_2_4_to_8(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(png_ptr);
if (bit_depth < 8)
png_set_packing(png_ptr);
png_read_update_info(png_ptr, info_ptr);
row_ptrs = (png_bytep *)malloc(sizeof(png_bytep) * height);
if (!row_ptrs)
goto error_alloc_rows;
vita2d_texture *texture = vita2d_create_empty_texture(width, height);
if (!texture)
goto error_create_tex;
void *texture_data = vita2d_texture_get_datap(texture);
unsigned int stride = vita2d_texture_get_stride(texture);
int i;
for (i = 0; i < height; i++) {
row_ptrs[i] = (png_bytep)(texture_data + i*stride);
}
png_read_image(png_ptr, row_ptrs);
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)0);
free(row_ptrs);
return texture;
error_create_tex:
free(row_ptrs);
error_alloc_rows:
png_destroy_info_struct(png_ptr, &info_ptr);
error_create_info:
png_destroy_read_struct(&png_ptr, (png_infopp)0, (png_infopp)0);
error_create_read:
return NULL;
}
int read_header(const char *filename, dt_imageio_png_t *png)
{
png->f = g_fopen(filename, "rb");
if(!png->f) return 1;
#define NUM_BYTES_CHECK (8)
png_byte dat[NUM_BYTES_CHECK];
size_t cnt = fread(dat, 1, NUM_BYTES_CHECK, png->f);
if(cnt != NUM_BYTES_CHECK || png_sig_cmp(dat, (png_size_t)0, NUM_BYTES_CHECK))
{
fclose(png->f);
return 1;
}
png->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png->png_ptr)
{
fclose(png->f);
return 1;
}
png->info_ptr = png_create_info_struct(png->png_ptr);
if(!png->info_ptr)
{
fclose(png->f);
png_destroy_read_struct(&png->png_ptr, NULL, NULL);
return 1;
}
if(setjmp(png_jmpbuf(png->png_ptr)))
{
fclose(png->f);
png_destroy_read_struct(&png->png_ptr, &png->info_ptr, NULL);
return 1;
}
png_init_io(png->png_ptr, png->f);
// we checked some bytes
png_set_sig_bytes(png->png_ptr, NUM_BYTES_CHECK);
// image info
png_read_info(png->png_ptr, png->info_ptr);
png->bit_depth = png_get_bit_depth(png->png_ptr, png->info_ptr);
png->color_type = png_get_color_type(png->png_ptr, png->info_ptr);
// image input transformations
// palette => rgb
if(png->color_type == PNG_COLOR_TYPE_PALETTE) png_set_palette_to_rgb(png->png_ptr);
// 1, 2, 4 bit => 8 bit
if(png->color_type == PNG_COLOR_TYPE_GRAY && png->bit_depth < 8)
{
png_set_expand_gray_1_2_4_to_8(png->png_ptr);
png->bit_depth = 8;
}
// strip alpha channel
if(png->color_type & PNG_COLOR_MASK_ALPHA) png_set_strip_alpha(png->png_ptr);
// grayscale => rgb
if(png->color_type == PNG_COLOR_TYPE_GRAY || png->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png->png_ptr);
// reflect changes
png_read_update_info(png->png_ptr, png->info_ptr);
// png->bytespp = 3*bit_depth/8;
png->width = png_get_image_width(png->png_ptr, png->info_ptr);
png->height = png_get_image_height(png->png_ptr, png->info_ptr);
#undef NUM_BYTES_CHECK
return 0;
}
char * load_png(char *name, int *width, int *height) {
FILE *png_file = fopen(name, "rb");
assert(png_file);
uint8_t header[PNG_SIG_BYTES];
fread(header, 1, PNG_SIG_BYTES, png_file);
assert(!png_sig_cmp(header, 0, PNG_SIG_BYTES));
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert(png_ptr);
png_infop info_ptr = png_create_info_struct(png_ptr);
assert(info_ptr);
png_infop end_info = png_create_info_struct(png_ptr);
assert(end_info);
assert(!setjmp(png_jmpbuf(png_ptr)));
png_init_io(png_ptr, png_file);
png_set_sig_bytes(png_ptr, PNG_SIG_BYTES);
png_read_info(png_ptr, info_ptr);
*width = png_get_image_width(png_ptr, info_ptr);
*height = png_get_image_height(png_ptr, info_ptr);
png_uint_32 bit_depth, color_type;
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
color_type = png_get_color_type(png_ptr, info_ptr);
if(color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_gray_1_2_4_to_8(png_ptr);
if (bit_depth == 16)
png_set_strip_16(png_ptr);
if(color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png_ptr);
else if(color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
png_set_gray_to_rgb(png_ptr);
}
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(png_ptr);
else
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
png_read_update_info(png_ptr, info_ptr);
png_uint_32 rowbytes = png_get_rowbytes(png_ptr, info_ptr);
png_uint_32 numbytes = rowbytes*(*height);
png_byte* pixels = malloc(numbytes);
png_byte** row_ptrs = malloc((*height) * sizeof(png_byte*));
int i;
for (i=0; i<(*height); i++)
row_ptrs[i] = pixels + ((*height) - 1 - i)*rowbytes;
png_read_image(png_ptr, row_ptrs);
free(row_ptrs);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(png_file);
return (char *)pixels;
}
bool initSludge (char * filename) {
int a = 0;
mouseCursorAnim = makeNullAnim ();
FILE * fp = openAndVerify (filename, 'G', 'E', ERROR_BAD_HEADER, gameVersion);
if (! fp) return false;
if (fgetc (fp)) {
numBIFNames = get2bytes (fp);
allBIFNames = new char * [numBIFNames];
if (! checkNew (allBIFNames)) return false;
for (int fn = 0; fn < numBIFNames; fn ++) {
allBIFNames[fn] = readString (fp);
}
numUserFunc = get2bytes (fp);
allUserFunc = new char * [numUserFunc];
if (! checkNew (allUserFunc)) return false;
for (int fn = 0; fn < numUserFunc; fn ++) {
allUserFunc[fn] = readString (fp);
}
if (gameVersion >= VERSION(1,3)) {
numResourceNames = get2bytes (fp);
allResourceNames = new char * [numResourceNames];
if (! checkNew (allResourceNames)) return false;
for (int fn = 0; fn < numResourceNames; fn ++) {
allResourceNames[fn] = readString (fp);
}
}
}
winWidth = get2bytes (fp);
winHeight = get2bytes (fp);
specialSettings = fgetc (fp);
desiredfps = 1000/fgetc (fp);
delete[] readString (fp); // Unused - was used for registration purposes.
size_t bytes_read = fread (& fileTime, sizeof (FILETIME), 1, fp);
if (bytes_read != sizeof (FILETIME) && ferror (fp)) {
debugOut("Reading error in initSludge.\n");
}
char * dataFol = (gameVersion >= VERSION(1,3)) ? readString(fp) : joinStrings ("", "");
gameSettings.numLanguages = (gameVersion >= VERSION(1,3)) ? (fgetc (fp)) : 0;
makeLanguageTable (fp);
if (gameVersion >= VERSION(1,6))
{
fgetc(fp);
// aaLoad
fgetc (fp);
getFloat (fp);
getFloat (fp);
}
char * checker = readString (fp);
if (strcmp (checker, "okSoFar")) return fatal (ERROR_BAD_HEADER, filename);
delete checker;
checker = NULL;
unsigned char customIconLogo = fgetc (fp);
if (customIconLogo & 1) {
// There is an icon - read it!
int n;
long file_pointer = ftell (fp);
png_structp png_ptr;
png_infop info_ptr, end_info;
int fileIsPNG = true;
// Is this a PNG file?
char tmp[10];
bytes_read = fread(tmp, 1, 8, fp);
if (bytes_read != 8 && ferror (fp)) {
debugOut("Reading error in initSludge.\n");
}
if (png_sig_cmp((png_byte *) tmp, 0, 8)) {
// No, it's old-school HSI
fileIsPNG = false;
fseek(fp, file_pointer, SEEK_SET);
iconW = get2bytes (fp);
iconH = get2bytes (fp);
} else {
// Read the PNG header
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
return false;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, (png_infopp) NULL, (png_infopp) NULL);
return false;
}
end_info = png_create_info_struct(png_ptr);
if (!end_info) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
return false;
}
png_init_io(png_ptr, fp); // Tell libpng which file to read
png_set_sig_bytes(png_ptr, 8); // 8 bytes already read
png_read_info(png_ptr, info_ptr);
png_uint_32 width, height;
int bit_depth, color_type, interlace_type, compression_type, filter_method;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, &compression_type, &filter_method);
iconW = width;
iconH = height;
if (bit_depth < 8) png_set_packing(png_ptr);
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) png_set_gray_to_rgb(png_ptr);
if (bit_depth == 16) png_set_strip_16(png_ptr);
png_set_add_alpha(png_ptr, 0xff, PNG_FILLER_AFTER);
png_read_update_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, &compression_type, &filter_method);
}
gameIcon = new unsigned char [iconW*iconH*4];
if (! gameIcon) return fatal ("Can't reserve memory for game icon.");
int32_t transCol = 63519;
Uint8 *p = (Uint8 *) gameIcon;
if (fileIsPNG) {
unsigned char * row_pointers[iconH];
for (int i = 0; i<iconH; i++)
row_pointers[i] = p + 4*i*iconW;
png_read_image(png_ptr, (png_byte **) row_pointers);
png_read_end(png_ptr, NULL);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
} else {
for (int t2 = 0; t2 < iconH; t2 ++) {
int t1 = 0;
while (t1 < iconW) {
unsigned short c = (unsigned short) get2bytes (fp);
if (c & 32) {
n = fgetc (fp) + 1;
c -= 32;
} else {
n = 1;
}
while (n --) {
*p++ = (Uint8) redValue(c);
*p++ = (Uint8) greenValue(c);
*p++ = (Uint8) blueValue(c);
*p++ = (Uint8) (c == transCol) ? 0 : 255;
t1++;
}
}
}
}
}
if (customIconLogo & 2) {
// There is an logo - read it!
int n;
long file_pointer = ftell (fp);
png_structp png_ptr;
png_infop info_ptr, end_info;
int fileIsPNG = true;
// Is this a PNG file?
char tmp[10];
bytes_read = fread(tmp, 1, 8, fp);
if (bytes_read != 8 && ferror (fp)) {
debugOut("Reading error in initSludge.\n");
}
if (png_sig_cmp((png_byte *) tmp, 0, 8)) {
// No, it's old-school HSI
fileIsPNG = false;
fseek(fp, file_pointer, SEEK_SET);
logoW = get2bytes (fp);
logoH = get2bytes (fp);
} else {
// Read the PNG header
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
return false;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, (png_infopp) NULL, (png_infopp) NULL);
return false;
}
end_info = png_create_info_struct(png_ptr);
if (!end_info) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
return false;
}
png_init_io(png_ptr, fp); // Tell libpng which file to read
png_set_sig_bytes(png_ptr, 8); // 8 bytes already read
png_read_info(png_ptr, info_ptr);
png_uint_32 width, height;
int bit_depth, color_type, interlace_type, compression_type, filter_method;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, &compression_type, &filter_method);
logoW = width;
logoH = height;
if (bit_depth < 8) png_set_packing(png_ptr);
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) png_set_gray_to_rgb(png_ptr);
if (bit_depth == 16) png_set_strip_16(png_ptr);
#ifdef WIN32
// Windows wants a BGR bitmap
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_bgr(png_ptr);
#endif
png_set_add_alpha(png_ptr, 0xff, PNG_FILLER_AFTER);
png_read_update_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, &compression_type, &filter_method);
}
if ((logoW != 310) || (logoH != 88)) return fatal ("Game logo have wrong dimensions. (Should be 310x88)");
gameLogo = new unsigned char [logoW*logoH*4];
if (! gameLogo) return fatal ("Can't reserve memory for game logo.");
// int32_t transCol = 63519;
Uint8 *p = (Uint8 *) gameLogo;
if (fileIsPNG) {
unsigned char * row_pointers[logoH];
for (int i = 0; i<logoH; i++)
row_pointers[i] = p + 4*i*logoW;
png_read_image(png_ptr, (png_byte **) row_pointers);
png_read_end(png_ptr, NULL);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
} else {
for (int t2 = 0; t2 < logoH; t2 ++) {
int t1 = 0;
while (t1 < logoW) {
unsigned short c = (unsigned short) get2bytes (fp);
if (c & 32) {
n = fgetc (fp) + 1;
c -= 32;
} else {
n = 1;
}
while (n --) {
#ifdef WIN32
// Windows wants a BGR bitmap
*p++ = (Uint8) blueValue(c);
*p++ = (Uint8) greenValue(c);
*p++ = (Uint8) redValue(c);
#else
*p++ = (Uint8) redValue(c);
*p++ = (Uint8) greenValue(c);
*p++ = (Uint8) blueValue(c);
#endif
*p++ = (Uint8) /*(c == transCol) ? 0 :*/ 255;
t1++;
}
}
}
}
}
numGlobals = get2bytes (fp);
globalVars = new variable[numGlobals];
if (! checkNew (globalVars)) return false;
for (a = 0; a < numGlobals; a ++) initVarNew (globalVars[a]);
// Get the original (untranslated) name of the game and convert it to Unicode.
// We use this to find saved preferences and saved games.
setFileIndices (fp, gameSettings.numLanguages, 0);
char * gameNameOrig = getNumberedString(1);
char * gameName = encodeFilename (gameNameOrig);
delete gameNameOrig;
changeToUserDir ();
#ifdef _WIN32
mkdir (gameName);
#else
mkdir (gameName, 0000777);
#endif
if (chdir (gameName)) return fatal ("This game's preference folder is inaccessible!\nI can't access the following directory (maybe there's a file with the same name, or maybe it's read-protected):", gameName);
delete [] gameName;
// Get user settings
readIniFile (filename);
// There's no startup window on Linux and respecting this
// option from the ini file would disable commandline options.
#if defined __unix__ && !(defined __APPLE__)
if (! showSetupWindow()) return 0;
saveIniFile (filename);
#else
if (! gameSettings.noStartWindow) {
if (! showSetupWindow()) return 0;
saveIniFile (filename);
}
#endif
// Now set file indices properly to the chosen language.
languageNum = getLanguageForFileB ();
if (languageNum < 0) return fatal ("Can't find the translation data specified!");
setFileIndices (NULL, gameSettings.numLanguages, languageNum);
if (dataFol[0]) {
char *dataFolder = encodeFilename(dataFol);
#ifdef _WIN32
mkdir (dataFolder);
#else
mkdir (dataFolder, 0000777);
#endif
if (chdir (dataFolder)) return fatal ("This game's data folder is inaccessible!\nI can't access the following directory (maybe there's a file with the same name, or maybe it's read-protected):", dataFolder);
delete dataFolder;
}
positionStatus (10, winHeight - 15);
return true;
}
color_image_t * color_image_png_load( FILE* fp, const char* file_name )
{
// read the header
png_byte header[8];
fread(header, 1, 8, fp);
if (png_sig_cmp(header, 0, 8))
{
fprintf(stderr, "error: %s is not a PNG.\n", file_name);
fclose(fp);
return 0;
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
fprintf(stderr, "error: png_create_read_struct returned 0.\n");
fclose(fp);
return 0;
}
// create png info struct
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
fprintf(stderr, "error: png_create_info_struct returned 0.\n");
png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
fclose(fp);
return 0;
}
// create png info struct
png_infop end_info = png_create_info_struct(png_ptr);
if (!end_info)
{
fprintf(stderr, "error: png_create_info_struct returned 0.\n");
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
fclose(fp);
return 0;
}
// the code in this if statement gets called if libpng encounters an error
if (setjmp(png_jmpbuf(png_ptr))) {
fprintf(stderr, "error from libpng\n");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
return 0;
}
// init png reading
png_init_io(png_ptr, fp);
// let libpng know you already read the first 8 bytes
png_set_sig_bytes(png_ptr, 8);
// read all the info up to the image data
png_read_info(png_ptr, info_ptr);
// variables to pass to get info
int bit_depth, color_type;
png_uint_32 temp_width, temp_height;
// get info about png
png_get_IHDR(png_ptr, info_ptr, &temp_width, &temp_height, &bit_depth, &color_type,
NULL, NULL, NULL);
// Update the png info struct.
png_read_update_info(png_ptr, info_ptr);
// Row size in bytes.
int rowbytes = png_get_rowbytes(png_ptr, info_ptr);
// Allocate the image_data as a big block, to be given to opengl
png_byte * image_data;
image_data = NEWA(png_byte, rowbytes * temp_height);
assert(image_data!=NULL);
// row_pointers is for pointing to image_data for reading the png with libpng
png_bytep * row_pointers = NEWA(png_bytep, temp_height);
assert(row_pointers!=NULL);
// set the individual row_pointers to point at the correct offsets of image_data
unsigned int i;
for (i = 0; i <temp_height; i++)
row_pointers[i] = image_data + i * rowbytes;
// read the png into image_data through row_pointers
png_read_image(png_ptr, row_pointers);
// copy into color image
color_image_t* image = color_image_new(temp_width,temp_height);
if( color_type==0 ) {
assert((unsigned)rowbytes == temp_width || !"error: not a proper gray png image");
for(i=0; i<temp_width*temp_height; i++)
image->c1[i] = image->c2[i] = image->c3[i] = image_data[i];
}
else if( color_type == 2 ) {
assert((unsigned)rowbytes == 3*temp_width || !"error: not a proper color png image");
for(i=0; i<temp_width*temp_height; i++) {
image->c1[i] = image_data[3*i+0];
image->c2[i] = image_data[3*i+1];
image->c3[i] = image_data[3*i+2];
}
} else
assert(!"error: unknown PNG color type" );
// clean up
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
free(row_pointers);
return image;
}
GLubyte*
glmReadPNG(const char* filename, GLboolean alpha, int* width_ret, int* height_ret, int* type_ret)
{
png_structp png_ptr;
png_infop info_ptr;
png_uint_32 width, height;
int bit_depth, color_type, interlace_type;
FILE *fp;
unsigned char *buffer;
int y, bytes_per_row;
int channels;
int format;
png_bytepp row_pointers;
printf("62");
if ((fp = fopen(filename, "rb")) == NULL) {
printf("64");
pngerror = ERR_OPEN;
return NULL;
}
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also supply the
* the compiler header file version, so that we know if the application
* was compiled with a compatible version of the library. REQUIRED
*/
/*png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
(void *)user_error_ptr, user_error_fn, user_warning_fn);*/
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, err_callback, warn_callback);
if (png_ptr == NULL) {
pngerror = ERR_MEM;
fclose(fp);
return 0;
}
/* Allocate/initialize the memory for image information. REQUIRED. */
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
pngerror = ERR_MEM;
fclose(fp);
png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
return 0;
}
/* Set error handling if you are using the setjmp/longjmp method (this is
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
buffer = NULL;
if (setjmp(setjmp_buffer)) {
pngerror = ERR_PNGLIB;
/* Free all of the memory associated with the png_ptr and info_ptr */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
fclose(fp);
/* If we get here, we had a problem reading the file */
if (buffer) free(buffer);
return NULL;
}
/* Set up the input control if you are using standard C streams */
png_init_io(png_ptr, fp);
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk). REQUIRED
*/
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
&interlace_type, NULL, NULL);
/**** Set up the data transformations you want. Note that these are all
**** optional. Only call them if you want/need them. Many of the
**** transformations only work on specific types of images, and many
**** are mutually exclusive.
****/
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
png_set_strip_16(png_ptr);
/* strip alpha bytes from the input data without combining with th
* background (not recommended) */
/* png_set_strip_alpha(png_ptr); */
/* extract multiple pixels with bit depths of 1, 2, and 4 from a single
* byte into separate bytes (useful for paletted and grayscale images).
*/
/* png_set_packing(png_ptr); */
/* change the order of packed pixels to least significant bit first
* (not useful if you are using png_set_packing). */
/* png_set_packswap(png_ptr); */
/* expand paletted colors into true RGB triplets */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png_ptr);
/* expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand(png_ptr);
/* expand paletted or RGB images with transparency to full alpha channels
* so the data will be available as RGBA quartets */
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
/* Add filler (or alpha) byte (before/after each RGB triplet) */
/* png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER); */
png_read_update_info(png_ptr, info_ptr);
channels = png_get_channels(png_ptr, info_ptr);
/* allocate the memory to hold the image using the fields of info_ptr. */
bytes_per_row = png_get_rowbytes(png_ptr, info_ptr);
buffer = (unsigned char*) malloc(bytes_per_row*height);
format = channels;
row_pointers = (png_bytepp) malloc(height*sizeof(png_bytep));
for (y = 0; y < height; y++) {
row_pointers[height-y-1] = buffer + y*bytes_per_row;
}
png_read_image(png_ptr, row_pointers);
png_read_end(png_ptr, info_ptr);
free(row_pointers);
/* clean up after the read, and free any memory allocated - REQUIRED */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
/* close the file */
fclose(fp);
/* that's it */
if (buffer) {
*width_ret = width;
*height_ret = height;
switch(format) {
case 1:
*type_ret = GL_LUMINANCE;
break;
case 2:
*type_ret = GL_LUMINANCE_ALPHA;
break;
case 3:
*type_ret = GL_RGB;
break;
case 4:
*type_ret = GL_RGBA;
break;
}
pngerror = ERR_NO_ERROR;
}
else {
pngerror = ERR_MEM;
}
return buffer;
}
static
void setup_qt(QImage& image, png_structp png_ptr, png_infop info_ptr, float screen_gamma=0.0)
{
if (screen_gamma != 0.0 && png_get_valid(png_ptr, info_ptr, PNG_INFO_gAMA)) {
double file_gamma;
png_get_gAMA(png_ptr, info_ptr, &file_gamma);
png_set_gamma(png_ptr, screen_gamma, file_gamma);
}
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int color_type;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
if (color_type == PNG_COLOR_TYPE_GRAY) {
// Black & White or 8-bit grayscale
if (bit_depth == 1 && info_ptr->channels == 1) {
png_set_invert_mono(png_ptr);
png_read_update_info(png_ptr, info_ptr);
if (image.size() != QSize(width, height) || image.format() != QImage::Format_Mono) {
image = QImage(width, height, QImage::Format_Mono);
if (image.isNull())
return;
}
image.setNumColors(2);
image.setColor(1, qRgb(0,0,0));
image.setColor(0, qRgb(255,255,255));
} else if (bit_depth == 16 && png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
png_set_expand(png_ptr);
png_set_strip_16(png_ptr);
png_set_gray_to_rgb(png_ptr);
if (image.size() != QSize(width, height) || image.format() != QImage::Format_ARGB32) {
image = QImage(width, height, QImage::Format_ARGB32);
if (image.isNull())
return;
}
if (QSysInfo::ByteOrder == QSysInfo::BigEndian)
png_set_swap_alpha(png_ptr);
png_read_update_info(png_ptr, info_ptr);
} else {
if (bit_depth == 16)
png_set_strip_16(png_ptr);
else if (bit_depth < 8)
png_set_packing(png_ptr);
int ncols = bit_depth < 8 ? 1 << bit_depth : 256;
png_read_update_info(png_ptr, info_ptr);
if (image.size() != QSize(width, height) || image.format() != QImage::Format_Indexed8) {
image = QImage(width, height, QImage::Format_Indexed8);
if (image.isNull())
return;
}
image.setNumColors(ncols);
for (int i=0; i<ncols; i++) {
int c = i*255/(ncols-1);
image.setColor(i, qRgba(c,c,c,0xff));
}
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
const int g = info_ptr->trans_values.gray;
if (g < ncols) {
image.setColor(g, 0);
}
}
}
} else if (color_type == PNG_COLOR_TYPE_PALETTE
&& png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE)
&& info_ptr->num_palette <= 256)
{
// 1-bit and 8-bit color
if (bit_depth != 1)
png_set_packing(png_ptr);
png_read_update_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
QImage::Format format = bit_depth == 1 ? QImage::Format_Mono : QImage::Format_Indexed8;
if (image.size() != QSize(width, height) || image.format() != format) {
image = QImage(width, height, format);
if (image.isNull())
return;
}
image.setNumColors(info_ptr->num_palette);
int i = 0;
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
while (i < info_ptr->num_trans) {
image.setColor(i, qRgba(
info_ptr->palette[i].red,
info_ptr->palette[i].green,
info_ptr->palette[i].blue,
info_ptr->trans[i]
)
);
i++;
}
}
while (i < info_ptr->num_palette) {
image.setColor(i, qRgba(
info_ptr->palette[i].red,
info_ptr->palette[i].green,
info_ptr->palette[i].blue,
0xff
)
);
i++;
}
} else {
// 32-bit
if (bit_depth == 16)
png_set_strip_16(png_ptr);
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
QImage::Format format = QImage::Format_ARGB32;
// Only add filler if no alpha, or we can get 5 channel data.
if (!(color_type & PNG_COLOR_MASK_ALPHA)
&& !png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
png_set_filler(png_ptr, 0xff, QSysInfo::ByteOrder == QSysInfo::BigEndian ?
PNG_FILLER_BEFORE : PNG_FILLER_AFTER);
// We want 4 bytes, but it isn't an alpha channel
format = QImage::Format_RGB32;
}
if (image.size() != QSize(width, height) || image.format() != format) {
image = QImage(width, height, format);
if (image.isNull())
return;
}
if (QSysInfo::ByteOrder == QSysInfo::BigEndian)
png_set_swap_alpha(png_ptr);
png_read_update_info(png_ptr, info_ptr);
}
// Qt==ARGB==Big(ARGB)==Little(BGRA)
if (QSysInfo::ByteOrder == QSysInfo::LittleEndian) {
png_set_bgr(png_ptr);
}
}
static FIBITMAP * DLL_CALLCONV
Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {
png_structp png_ptr;
png_infop info_ptr;
png_uint_32 width, height;
png_colorp png_palette;
int color_type, palette_entries;
int bit_depth, pixel_depth; // pixel_depth = bit_depth * channels
FIBITMAP *dib = NULL;
RGBQUAD *palette = NULL; // pointer to dib palette
png_bytepp row_pointers = NULL;
int i;
fi_ioStructure fio;
fio.s_handle = handle;
fio.s_io = io;
if (handle) {
try {
// check to see if the file is in fact a PNG file
unsigned char png_check[PNG_BYTES_TO_CHECK];
io->read_proc(png_check, PNG_BYTES_TO_CHECK, 1, handle);
if (png_sig_cmp(png_check, (png_size_t)0, PNG_BYTES_TO_CHECK) != 0)
return NULL; // Bad signature
// create the chunk manage structure
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, error_handler, warning_handler);
if (!png_ptr)
return NULL;
// create the info structure
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
return NULL;
}
// init the IO
png_set_read_fn(png_ptr, &fio, _ReadProc);
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
// because we have already read the signature...
png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK);
// read the IHDR chunk
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, NULL, NULL, NULL);
pixel_depth = info_ptr->pixel_depth;
// get image data type (assume standard image type)
FREE_IMAGE_TYPE image_type = FIT_BITMAP;
if (bit_depth == 16) {
if ((pixel_depth == 16) && (color_type == PNG_COLOR_TYPE_GRAY)) {
image_type = FIT_UINT16;
#ifndef FREEIMAGE_BIGENDIAN
// turn on 16 bit byte swapping
png_set_swap(png_ptr);
#endif
}
else if ((pixel_depth == 48) && (color_type == PNG_COLOR_TYPE_RGB)) {
image_type = FIT_RGB16;
#ifndef FREEIMAGE_BIGENDIAN
// turn on 16 bit byte swapping
png_set_swap(png_ptr);
#endif
} else {
// tell libpng to strip 16 bit/color files down to 8 bits/color
png_set_strip_16(png_ptr);
bit_depth = 8;
}
}
// set some additional flags
switch(color_type) {
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_RGB_ALPHA:
#ifndef FREEIMAGE_BIGENDIAN
// flip the RGB pixels to BGR (or RGBA to BGRA)
if(image_type == FIT_BITMAP)
png_set_bgr(png_ptr);
#endif
break;
case PNG_COLOR_TYPE_PALETTE:
// expand palette images to the full 8 bits from 2 bits/pixel
if (pixel_depth == 2) {
png_set_packing(png_ptr);
pixel_depth = 8;
}
break;
case PNG_COLOR_TYPE_GRAY:
// expand grayscale images to the full 8 bits from 2 bits/pixel
if (pixel_depth == 2) {
png_set_expand(png_ptr);
pixel_depth = 8;
}
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
// expand 8-bit greyscale + 8-bit alpha to 32-bit
png_set_gray_to_rgb(png_ptr);
#ifndef FREEIMAGE_BIGENDIAN
// flip the RGBA pixels to BGRA
png_set_bgr(png_ptr);
#endif
pixel_depth = 32;
break;
default:
throw "PNG format not supported";
}
// Get the background color to draw transparent and alpha images over.
// Note that even if the PNG file supplies a background, you are not required to
// use it - you should use the (solid) application background if it has one.
png_color_16p image_background = NULL;
RGBQUAD rgbBkColor;
if (png_get_bKGD(png_ptr, info_ptr, &image_background)) {
rgbBkColor.rgbRed = (BYTE)image_background->red;
rgbBkColor.rgbGreen = (BYTE)image_background->green;
rgbBkColor.rgbBlue = (BYTE)image_background->blue;
rgbBkColor.rgbReserved = 0;
}
// if this image has transparency, store the trns values
png_bytep trans = NULL;
int num_trans = 0;
png_color_16p trans_values = NULL;
png_uint_32 transparent_value = png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, &trans_values);
// unlike the example in the libpng documentation, we have *no* idea where
// this file may have come from--so if it doesn't have a file gamma, don't
// do any correction ("do no harm")
double gamma = 0;
double screen_gamma = 2.2;
if (png_get_gAMA(png_ptr, info_ptr, &gamma) && ( flags & PNG_IGNOREGAMMA ) != PNG_IGNOREGAMMA)
png_set_gamma(png_ptr, screen_gamma, gamma);
// all transformations have been registered; now update info_ptr data
png_read_update_info(png_ptr, info_ptr);
// color type may have changed, due to our transformations
color_type = png_get_color_type(png_ptr,info_ptr);
// create a DIB and write the bitmap header
// set up the DIB palette, if needed
switch (color_type) {
case PNG_COLOR_TYPE_RGB:
png_set_invert_alpha(png_ptr);
if(image_type == FIT_BITMAP) {
dib = FreeImage_Allocate(width, height, 24, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
} else {
dib = FreeImage_AllocateT(image_type, width, height, pixel_depth);
}
break;
case PNG_COLOR_TYPE_RGB_ALPHA :
dib = FreeImage_Allocate(width, height, 32, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
break;
case PNG_COLOR_TYPE_PALETTE :
dib = FreeImage_Allocate(width, height, pixel_depth);
png_get_PLTE(png_ptr,info_ptr, &png_palette,&palette_entries);
palette = FreeImage_GetPalette(dib);
// store the palette
for (i = 0; i < palette_entries; i++) {
palette[i].rgbRed = png_palette[i].red;
palette[i].rgbGreen = png_palette[i].green;
palette[i].rgbBlue = png_palette[i].blue;
}
// store the transparency table
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
FreeImage_SetTransparencyTable(dib, (BYTE *)trans, num_trans);
break;
case PNG_COLOR_TYPE_GRAY:
dib = FreeImage_AllocateT(image_type, width, height, pixel_depth);
if(pixel_depth <= 8) {
palette = FreeImage_GetPalette(dib);
palette_entries = 1 << pixel_depth;
for (i = 0; i < palette_entries; i++) {
palette[i].rgbRed =
palette[i].rgbGreen =
palette[i].rgbBlue = (i * 255) / (palette_entries - 1);
}
}
// store the transparency table
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
FreeImage_SetTransparencyTable(dib, (BYTE *)trans, num_trans);
break;
default:
throw "PNG format not supported";
}
// store the background color
if(image_background) {
FreeImage_SetBackgroundColor(dib, &rgbBkColor);
}
// get physical resolution
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_pHYs)) {
png_uint_32 res_x, res_y;
// we'll overload this var and use 0 to mean no phys data,
// since if it's not in meters we can't use it anyway
int res_unit_type = 0;
png_get_pHYs(png_ptr,info_ptr,&res_x,&res_y,&res_unit_type);
if (res_unit_type == 1) {
BITMAPINFOHEADER *bih = FreeImage_GetInfoHeader(dib);
bih->biXPelsPerMeter = res_x;
bih->biYPelsPerMeter = res_y;
}
}
// get possible ICC profile
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_iCCP)) {
png_charp profile_name = NULL;
png_charp profile_data = NULL;
png_uint_32 profile_length = 0;
int compression_type;
png_get_iCCP(png_ptr, info_ptr, &profile_name, &compression_type, &profile_data, &profile_length);
// copy ICC profile data (must be done after FreeImage_Allocate)
FreeImage_CreateICCProfile(dib, profile_data, profile_length);
}
// set the individual row_pointers to point at the correct offsets
row_pointers = (png_bytepp)malloc(height * sizeof(png_bytep));
if (!row_pointers) {
if (palette)
png_free(png_ptr, palette);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
FreeImage_Unload(dib);
return NULL;
}
// read in the bitmap bits via the pointer table
for (png_uint_32 k = 0; k < height; k++)
row_pointers[height - 1 - k] = FreeImage_GetScanLine(dib, k);
png_read_image(png_ptr, row_pointers);
// check if the bitmap contains transparency, if so enable it in the header
if (FreeImage_GetBPP(dib) == 32)
if (FreeImage_GetColorType(dib) == FIC_RGBALPHA)
FreeImage_SetTransparent(dib, TRUE);
else
FreeImage_SetTransparent(dib, FALSE);
// cleanup
if (row_pointers) {
free(row_pointers);
row_pointers = NULL;
}
// read the rest of the file, getting any additional chunks in info_ptr
png_read_end(png_ptr, info_ptr);
// get possible metadata (it can be located both before and after the image data)
ReadMetadata(png_ptr, info_ptr, dib);
if (png_ptr) {
// clean up after the read, and free any memory allocated - REQUIRED
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
}
return dib;
} catch (const char *text) {
if (png_ptr)
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
if (row_pointers)
free(row_pointers);
if (dib)
FreeImage_Unload(dib);
FreeImage_OutputMessageProc(s_format_id, text);
return NULL;
}
}
return NULL;
}
void LoadPNG (char *filename, byte **pic, int *width, int *height)
{
png_structp png;
png_infop pnginfo;
byte ioBuffer[8192];
int len;
byte *raw;
*pic=0;
len = ri.FS_LoadFile (filename, (void **)&raw);
if (!raw)
{
ri.Con_Printf (PRINT_DEVELOPER, "Bad png file %s\n", filename);
return;
}
if( png_sig_cmp(raw,0,4))
return;
png = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
if(!png)
return;
pnginfo = png_create_info_struct( png );
if(!pnginfo)
{
png_destroy_read_struct(&png,&pnginfo,0);
return;
}
png_set_sig_bytes(png,0/*sizeof( sig )*/);
mypng_struct_create(); // creates the my_png struct
my_png->tmpBuf = raw; //buf = whole file content
my_png->tmpi=0;
png_set_read_fn(png,ioBuffer,fReadData );
png_read_info( png, pnginfo );
png_get_IHDR(png, pnginfo, &my_png->Width, &my_png->Height,&my_png->BitDepth, &my_png->ColorType, &my_png->Interlace, &my_png->Compression, &my_png->Filter );
// ...removed bgColor code here...
if (my_png->ColorType == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png);
if (my_png->ColorType == PNG_COLOR_TYPE_GRAY && my_png->BitDepth < 8)
png_set_gray_1_2_4_to_8(png);
// Add alpha channel if present
if(png_get_valid( png, pnginfo, PNG_INFO_tRNS ))
png_set_tRNS_to_alpha(png);
// hax: expand 24bit to 32bit
if (my_png->BitDepth == 8 && my_png->ColorType == PNG_COLOR_TYPE_RGB)
png_set_filler(png,255, PNG_FILLER_AFTER);
if (( my_png->ColorType == PNG_COLOR_TYPE_GRAY) || (my_png->ColorType == PNG_COLOR_TYPE_GRAY_ALPHA ))
png_set_gray_to_rgb( png );
if (my_png->BitDepth < 8)
png_set_expand (png);
// update the info structure
png_read_update_info( png, pnginfo );
my_png->FRowBytes = png_get_rowbytes( png, pnginfo );
my_png->BytesPerPixel = png_get_channels( png, pnginfo ); // DL Added 30/08/2000
InitializeDemData();
if((my_png->Data)&&(my_png->FRowPtrs))
png_read_image(png, (png_bytepp)my_png->FRowPtrs);
png_read_end(png, pnginfo); // read last information chunks
png_destroy_read_struct(&png, &pnginfo, 0);
//only load 32 bit by now...
if (my_png->BitDepth == 8)
{
*pic= my_png->Data;
*width = my_png->Width;
*height = my_png->Height;
}
else
{
ri.Con_Printf (PRINT_DEVELOPER, "Bad png color depth: %s\n", filename);
*pic = NULL;
free(my_png->Data);
}
mypng_struct_destroy(true);
ri.FS_FreeFile ((void *)raw);
}
static e_texture_t* e_loadpng(e_device_t* device,int mipmaps,fs_handle_t file)
{
unsigned int width,height;
unsigned int rowbytes;
unsigned char* data;
unsigned char** rows;
unsigned int i;
int bpp,type;
int format;
png_structp png;
png_infop info;
e_texture_t* texture;
if(!e_checkpng(file))
return 0;
png=png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,(png_error_ptr)0,(png_error_ptr)0);
if(!png)
return 0;
info=png_create_info_struct(png);
if(!info)
{
png_destroy_read_struct(&png,0,0);
return 0;
}
//Needed by libpng
if(setjmp(png_jmpbuf(png)))
{
png_destroy_read_struct(&png,&info,0);
if(rows)
sys_free(rows);
if(data)
sys_free(data);
return 0;
}
//Read up to image data
png_set_read_fn(png,(png_voidp)file,e_readpng);
png_set_sig_bytes(png,8);
png_read_info(png,info);
png_get_IHDR(png,info,&width,&height,&bpp,&type,0,0,0);
if(width!=e_pow2(width)||
height!=e_pow2(height))
longjmp(png_jmpbuf(png),1);
//Convert this image to fit the required format
if(type==PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png);
if(type==PNG_COLOR_TYPE_GRAY||
type==PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
if(type==PNG_COLOR_TYPE_GRAY||bpp<8)
png_set_expand(png);
if(png_get_valid(png,info,PNG_INFO_tRNS))
png_set_tRNS_to_alpha(png);
png_read_update_info(png,info);
rowbytes=png_get_rowbytes(png,info);
//Allocate memory to store the image
data=(unsigned char*)sys_alloc(rowbytes*height);
if(!data)
longjmp(png_jmpbuf(png),1);
rows=(unsigned char**)sys_alloc(sizeof(unsigned char*)*height);
if(!rows)
longjmp(png_jmpbuf(png),1);
for(i=0;i<height;i++)
rows[i]=data+(height-(i+1))*rowbytes;
//Read png
png_read_image(png,rows);
png_read_end(png,0);
sys_free(rows);
texture=(e_texture_t*)sys_alloc(sizeof(e_texture_t));
texture->width=width;
texture->height=height;
glGenTextures(1,&texture->id);
glBindTexture(GL_TEXTURE_2D,texture->id);
texture->bpp=(type&PNG_COLOR_MASK_ALPHA)?32:24;
format=(type&PNG_COLOR_MASK_ALPHA)?GL_RGBA:GL_RGB;
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
if(mipmaps)
gluBuild2DMipmaps(GL_TEXTURE_2D,(type&PNG_COLOR_MASK_ALPHA)?4:3,texture->width,texture->height,format,GL_UNSIGNED_BYTE,data);
else
glTexImage2D(GL_TEXTURE_2D,0,format,texture->width,texture->height,0,format,GL_UNSIGNED_BYTE,data);
sys_free(data);
return texture;
}
void PNGAPI
png_read_png(png_structp png_ptr, png_infop info_ptr,
int transforms,
voidp params)
{
int row;
if (png_ptr == NULL) return;
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel from opacity to transparency
*/
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
png_set_invert_alpha(png_ptr);
#endif
/* png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk).
*/
png_read_info(png_ptr, info_ptr);
if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
png_error(png_ptr, "Image is too high to process with png_read_png()");
/* -------------- image transformations start here ------------------- */
#if defined(PNG_READ_16_TO_8_SUPPORTED)
/* tell libpng to strip 16 bit/color files down to 8 bits per color
*/
if (transforms & PNG_TRANSFORM_STRIP_16)
png_set_strip_16(png_ptr);
#endif
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
/* Strip alpha bytes from the input data without combining with
* the background (not recommended).
*/
if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
png_set_strip_alpha(png_ptr);
#endif
#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
/* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
* byte into separate bytes (useful for paletted and grayscale images).
*/
if (transforms & PNG_TRANSFORM_PACKING)
png_set_packing(png_ptr);
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
/* Change the order of packed pixels to least significant bit first
* (not useful if you are using png_set_packing).
*/
if (transforms & PNG_TRANSFORM_PACKSWAP)
png_set_packswap(png_ptr);
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
/* Expand paletted colors into true RGB triplets
* Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
* Expand paletted or RGB images with transparency to full alpha
* channels so the data will be available as RGBA quartets.
*/
if (transforms & PNG_TRANSFORM_EXPAND)
if ((png_ptr->bit_depth < 8) ||
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
png_set_expand(png_ptr);
#endif
/* We don't handle background color or gamma transformation or dithering.
*/
#if defined(PNG_READ_INVERT_SUPPORTED)
/* invert monochrome files to have 0 as white and 1 as black
*/
if (transforms & PNG_TRANSFORM_INVERT_MONO)
png_set_invert_mono(png_ptr);
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED)
/* If you want to shift the pixel values from the range [0,255] or
* [0,65535] to the original [0,7] or [0,31], or whatever range the
* colors were originally in:
*/
if ((transforms & PNG_TRANSFORM_SHIFT)
&& png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
{
png_color_8p sig_bit;
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_shift(png_ptr, sig_bit);
}
#endif
#if defined(PNG_READ_BGR_SUPPORTED)
/* flip the RGB pixels to BGR (or RGBA to BGRA)
*/
if (transforms & PNG_TRANSFORM_BGR)
png_set_bgr(png_ptr);
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
/* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
*/
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_READ_SWAP_SUPPORTED)
/* swap bytes of 16 bit files to least significant byte first
*/
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
png_set_swap(png_ptr);
#endif
/* We don't handle adding filler bytes */
/* Optional call to gamma correct and add the background to the palette
* and update info structure. REQUIRED if you are expecting libpng to
* update the palette for you (i.e., you selected such a transform above).
*/
png_read_update_info(png_ptr, info_ptr);
/* -------------- image transformations end here ------------------- */
#ifdef PNG_FREE_ME_SUPPORTED
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
#endif
if (info_ptr->row_pointers == NULL)
{
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
info_ptr->height * png_sizeof(png_bytep));
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_ROWS;
#endif
png_memset(info_ptr->row_pointers, 0, info_ptr->height
* png_sizeof(png_bytep));
for (row = 0; row < (int)info_ptr->height; row++)
info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
png_get_rowbytes(png_ptr, info_ptr));
}
png_read_image(png_ptr, info_ptr->row_pointers);
info_ptr->valid |= PNG_INFO_IDAT;
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
transforms = transforms; /* quiet compiler warnings */
params = params;
}
void png_load_from_memory(aasset_buffer_t& buf, raw_bitmap_t* out_bitmap)
{
//png header - 8 bytes
if (png_sig_cmp(buf.data(), 0, 8))
{
my_assert(false && "Couldn't load texture. It isn't png file.");
return;
}
auto png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
my_assert(png_ptr && "Couldn't load texture. Png load error.");
MAKE_GUARD(png_ptr, [](decltype(png_ptr) ptr)
{ png_destroy_read_struct(&ptr, (png_infopp)NULL, (png_infopp)NULL);});
auto info_ptr = png_create_info_struct(png_ptr);
my_assert(info_ptr && "Couldn't load texture. Png load error.");
auto info_deleter = [png_ptr](decltype(info_ptr) ptr)
{ png_destroy_info_struct(png_ptr, &ptr);};
MAKE_GUARD(info_ptr, info_deleter);
// the code in this if statement gets called if libpng encounters an error
if (setjmp((long*) png_jmpbuf(png_ptr)))
{
my_assert(false && "error from libpng");
return;
}
png_set_read_fn(png_ptr, &buf, read_from_aasset_buffer);
// tell libpng we already read the signature
png_set_sig_bytes(png_ptr, 8);
buf.seek(8);
png_read_info(png_ptr, info_ptr);
png_uint_32 width = 0;
png_uint_32 height = 0;
int bitDepth = 0;
int colorType = -1;
auto res = png_get_IHDR(png_ptr, info_ptr, &width, &height, &bitDepth, &colorType, NULL, NULL, NULL);
my_assert(res == 1);
bool transparency = false;
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
{
png_set_tRNS_to_alpha(png_ptr);
transparency = true;
}
// Expands PNG with less than 8bits per channel to 8bits.
if (bitDepth < 8)
{
png_set_packing(png_ptr);
// Shrinks PNG with 16bits per color channel down to 8bits.
}
else if (bitDepth == 16)
{
png_set_strip_16(png_ptr);
}
uint32_t format = 0;
switch (colorType)
{
case PNG_COLOR_TYPE_RGB:
format = transparency ? GL_RGBA : GL_RGB;
break;
case PNG_COLOR_TYPE_RGBA:
format = GL_RGBA;
break;
case PNG_COLOR_TYPE_PALETTE:
{
png_set_palette_to_rgb(png_ptr);
format = transparency ? GL_RGBA : GL_RGB;
break;
}
default:
my_assert(false && "Png read error. Uknown color type");
return;
}
//apply transformations
png_read_update_info(png_ptr, info_ptr);
out_bitmap->init(width, height, format);
auto row_size = png_get_rowbytes(png_ptr, info_ptr);
my_assert(row_size > 0);
my_assert(row_size == width * out_bitmap->bytes_per_pixel());
auto row_ptrs = new png_bytep[height];
MAKE_GUARD(row_ptrs, [](decltype(row_ptrs) ptr)
{ delete[] ptr;});
for (int32_t i = 0; i < height; ++i)
{
row_ptrs[height - (i + 1)] = out_bitmap->get_row(i);
}
png_read_image(png_ptr, row_ptrs);
}
Error ImageLoaderPNG::_load_image(void *rf_up,png_rw_ptr p_func,Image *p_image) {
png_structp png;
png_infop info;
//png = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, NULL, NULL);
png = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,_png_error_function,_png_warn_function,(png_voidp)NULL,
_png_malloc_fn,_png_free_fn );
ERR_FAIL_COND_V(!png, ERR_OUT_OF_MEMORY);
info = png_create_info_struct(png);
if (!info) {
png_destroy_read_struct(&png,NULL,NULL);
ERR_PRINT("Out of Memory");
return ERR_OUT_OF_MEMORY;
}
if (setjmp(png_jmpbuf(png))) {
png_destroy_read_struct(&png,NULL,NULL);
ERR_PRINT("PNG Corrupted");
return ERR_FILE_CORRUPT;
}
png_set_read_fn(png,(void*)rf_up,p_func);
png_uint_32 width, height;
int depth, color;
png_read_info(png, info);
png_get_IHDR(png, info, &width, &height, &depth, &color, NULL, NULL, NULL);
//https://svn.gov.pt/projects/ccidadao/repository/middleware-offline/trunk/_src/eidmw/FreeImagePTEiD/Source/FreeImage/PluginPNG.cpp
//png_get_text(png,info,)
/*
printf("Image width:%i\n", width);
printf("Image Height:%i\n", height);
printf("Bit depth:%i\n", depth);
printf("Color type:%i\n", color);
*/
if (depth<8) { //only bit dept 8 per channel is handled
png_set_packing(png);
};
if (depth > 8) {
png_set_strip_16(png);
png_read_update_info(png, info);
}
if (png_get_valid(png,info,PNG_INFO_tRNS)) {
// png_set_expand_gray_1_2_4_to_8(png);
png_set_tRNS_to_alpha(png);
png_read_update_info(png, info);
png_get_IHDR(png, info, &width, &height, &depth, &color, NULL, NULL, NULL);
}
int palette_colors = 0;
int palette_components = 0;
int components = 0;
Image::Format fmt;
switch(color) {
case PNG_COLOR_TYPE_GRAY: {
fmt=Image::FORMAT_GRAYSCALE;
components=1;
} break;
case PNG_COLOR_TYPE_GRAY_ALPHA: {
fmt=Image::FORMAT_GRAYSCALE_ALPHA;
components=2;
} break;
case PNG_COLOR_TYPE_RGB: {
fmt=Image::FORMAT_RGB;
components=3;
} break;
case PNG_COLOR_TYPE_RGB_ALPHA: {
fmt=Image::FORMAT_RGBA;
components=4;
} break;
case PNG_COLOR_TYPE_PALETTE: {
int ntrans = 0;
png_get_tRNS(png, info, NULL, &ntrans, NULL);
//printf("transparent colors %i\n", ntrans);
fmt = ntrans > 0 ? Image::FORMAT_INDEXED_ALPHA : Image::FORMAT_INDEXED;
palette_components = ntrans > 0 ? 4 : 3;
components = 1;
png_colorp colors;
png_get_PLTE(png, info, &colors, &palette_colors);
} break;
default: {
ERR_PRINT("INVALID PNG TYPE");
png_destroy_read_struct(&png, &info, NULL);
return ERR_UNAVAILABLE;
} break;
}
//int rowsize = png_get_rowbytes(png, info);
int rowsize = components * width;
DVector<uint8_t> dstbuff;
dstbuff.resize( rowsize * height + palette_components * 256 ); // alloc the entire palette? - yes always
DVector<uint8_t>::Write dstbuff_write = dstbuff.write();
uint8_t* data = dstbuff_write.ptr();
uint8_t **row_p = memnew_arr( uint8_t*, height );
for (unsigned int i = 0; i < height; i++) {
row_p[i] = &data[components*width*i];
}
png_read_image(png, (png_bytep*)row_p);
if (palette_colors) {
uint8_t *r_pal = &data[components*width*height]; // end of the array
png_colorp colors;
int num;
png_get_PLTE(png, info, &colors, &num);
int ofs = 0;
for (int i=0; i < palette_colors; i++) {
r_pal[ofs + 0] = colors[i].red;
r_pal[ofs + 1] = colors[i].green;
r_pal[ofs + 2] = colors[i].blue;
if (palette_components == 4) {
r_pal[ofs + 3] = 255;
};
ofs += palette_components;
};
if (fmt == Image::FORMAT_INDEXED_ALPHA) {
png_color_16p alphas;
png_bytep alpha_idx;
int count;
png_get_tRNS(png, info, &alpha_idx, &count, &alphas);
for (int i=0; i<count; i++) {
//printf("%i: loading alpha fron transparent color %i, values %i, %i, %i, %i, %i\n", i, (int)alpha_idx[i], (int)alphas[i].index, (int)alphas[i].red, (int)alphas[i].green, (int)alphas[i].blue, (int)alphas[i].gray);
//r_pal[alpha_idx[i]] = alphas[i].gray >> 8;
r_pal[i*4+3] = alpha_idx[i];
};
};
};
memdelete_arr( row_p );
p_image->create( width, height, 0,fmt, dstbuff );
png_destroy_read_struct(&png, &info, NULL );
return OK;
}
ImageNode *LoadPNGImage(const char *fileName)
{
static ImageNode *result;
static FILE *fd;
static unsigned char **rows;
static png_structp pngData;
static png_infop pngInfo;
static png_infop pngEndInfo;
unsigned char header[8];
unsigned long rowBytes;
int bitDepth, colorType;
unsigned int x, y;
png_uint_32 width;
png_uint_32 height;
Assert(fileName);
result = NULL;
fd = NULL;
rows = NULL;
pngData = NULL;
pngInfo = NULL;
pngEndInfo = NULL;
fd = fopen(fileName, "rb");
if(!fd) {
return NULL;
}
x = fread(header, 1, sizeof(header), fd);
if(x != sizeof(header) || png_sig_cmp(header, 0, sizeof(header))) {
fclose(fd);
return NULL;
}
pngData = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(JUNLIKELY(!pngData)) {
fclose(fd);
Warning(_("could not create read struct for PNG image: %s"), fileName);
return NULL;
}
if(JUNLIKELY(setjmp(png_jmpbuf(pngData)))) {
png_destroy_read_struct(&pngData, &pngInfo, &pngEndInfo);
if(fd) {
fclose(fd);
}
if(rows) {
ReleaseStack(rows);
}
DestroyImage(result);
Warning(_("error reading PNG image: %s"), fileName);
return NULL;
}
pngInfo = png_create_info_struct(pngData);
if(JUNLIKELY(!pngInfo)) {
png_destroy_read_struct(&pngData, NULL, NULL);
fclose(fd);
Warning(_("could not create info struct for PNG image: %s"), fileName);
return NULL;
}
pngEndInfo = png_create_info_struct(pngData);
if(JUNLIKELY(!pngEndInfo)) {
png_destroy_read_struct(&pngData, &pngInfo, NULL);
fclose(fd);
Warning("could not create end info struct for PNG image: %s", fileName);
return NULL;
}
png_init_io(pngData, fd);
png_set_sig_bytes(pngData, sizeof(header));
png_read_info(pngData, pngInfo);
png_get_IHDR(pngData, pngInfo, &width, &height,
&bitDepth, &colorType, NULL, NULL, NULL);
result = CreateImage(width, height, 0);
png_set_expand(pngData);
if(bitDepth == 16) {
png_set_strip_16(pngData);
} else if(bitDepth < 8) {
png_set_packing(pngData);
}
png_set_swap_alpha(pngData);
png_set_filler(pngData, 0xFF, PNG_FILLER_BEFORE);
if(colorType == PNG_COLOR_TYPE_GRAY
|| colorType == PNG_COLOR_TYPE_GRAY_ALPHA) {
png_set_gray_to_rgb(pngData);
}
png_read_update_info(pngData, pngInfo);
rowBytes = png_get_rowbytes(pngData, pngInfo);
rows = AllocateStack(result->height * sizeof(result->data));
y = 0;
for(x = 0; x < result->height; x++) {
rows[x] = &result->data[y];
y += rowBytes;
}
png_read_image(pngData, rows);
png_read_end(pngData, pngInfo);
png_destroy_read_struct(&pngData, &pngInfo, &pngEndInfo);
fclose(fd);
ReleaseStack(rows);
rows = NULL;
return result;
}
void loadNativePNG(texture_t* tmpTex)
{
png_structp png_ptr;
png_infop info_ptr;
unsigned int width;
unsigned int height;
int i;
int bit_depth;
int color_type ;
png_size_t rowbytes;
png_bytep *row_pointers;
png_byte header[8];
char realPath[1024];
memset(realPath, 0, 1024);
strcat(realPath, FS_Gamedir());
if (tmpTex->path[0] != '/')
strcat(realPath, "/");
strcat(realPath, tmpTex->path);
tmpTex->format = TEXTURE_TYPE_UNKNOWN ;
file = zip_fopen(APKArchive, realPath, 0);
//LOGI("[Android Main] Opening %s", realPath);
if ( !file )
abort_textureLoading_("Could not open file '%s'\n",tmpTex->path);
zip_fread(file, header, 8);
if (png_sig_cmp(header, 0, 8) != 0 )
abort_textureLoading_("[read_png_file] File is not recognized as a PNG file.\n", tmpTex->path);
// initialize
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL)
abort_textureLoading_("[read_png_file] png_create_read_struct failed");
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
abort_textureLoading_("[read_png_file] png_create_info_struct failed");
if (setjmp(png_jmpbuf(png_ptr)))
abort_textureLoading_("[read_png_file] Error during init_io");
png_set_read_fn(png_ptr, NULL, png_zip_read);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
//Retrieve metadata and transfer to structure bean tmpTex
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, NULL, NULL, NULL);
tmpTex->width = width;
tmpTex->height = height;
// Set up some transforms.
/*if (color_type & PNG_COLOR_MASK_ALPHA) {
png_set_strip_alpha(png_ptr);
}*/
if (bit_depth > 8) {
png_set_strip_16(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
png_set_gray_to_rgb(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_palette_to_rgb(png_ptr);
}
// Update the png info struct.
png_read_update_info(png_ptr, info_ptr);
// Rowsize in bytes.
rowbytes = png_get_rowbytes(png_ptr, info_ptr);
tmpTex->bpp = rowbytes / width;
if (tmpTex->bpp == 4)
tmpTex->format = TEXTURE_GL_RGBA;
else
tmpTex->format = TEXTURE_GL_RGB;
LOGI("DEBUG: For %s, bpp: %i, color_type: %i, bit_depth: %i", realPath, tmpTex->bpp, color_type, bit_depth);
//Since PNG can only store one image there is only one mipmap, allocated an array of one
tmpTex->numMipmaps = 1;
tmpTex->data = malloc(sizeof(uchar*));
if ((tmpTex->data[0] = (uchar*)malloc(rowbytes * height))==NULL)
{
//Oops texture won't be able to hold the result :(, cleanup LIBPNG internal state and return;
free(tmpTex->data);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return;
}
//Next we need to send to libpng an array of pointer, let's point to tmpTex->data[0]
if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL)
{
// Oops looks like we won't have enough RAM to allocate an array of pointer....
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(tmpTex->data );
tmpTex->data = NULL;
return;
}
//FCS: Hm, it looks like we are flipping the image vertically.
// Since iOS did not do it, we may have to not to that. If result is
// messed up, just swap to: row_pointers[ i] = ....
for (i = 0; i < height; ++i)
//row_pointers[height - 1 - i] = tmpTex->data[0] + i * rowbytes;
row_pointers[ i] = tmpTex->data[0] + i*rowbytes;
//Decompressing PNG to RAW where row_pointers are pointing (tmpTex->data[0])
png_read_image(png_ptr, row_pointers);
//Last but not least:
// Free LIBPNG internal state.
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
//Free the decompression buffer
free(row_pointers);
zip_fclose(file);
}
GLuint png_texture_load(const char * file_name, int width, int height)
{
png_uint_32 temp_width, temp_height;
int bit_depth, color_type, i;
png_byte header[8];
GLuint texture;
FILE *fp = fopen(file_name, "rb");
if (fp == 0)
{
perror(file_name);
return 0;
}
// read the header
fread(header, 1, 8, fp);
if (png_sig_cmp(header, 0, 8))
{
fprintf(stderr, "error: %s is not a PNG.\n", file_name);
fclose(fp);
return 0;
}
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
fprintf(stderr, "error: png_create_read_struct returned 0.\n");
fclose(fp);
return 0;
}
// create png info struct
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
fprintf(stderr, "error: png_create_info_struct returned 0.\n");
png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
fclose(fp);
return 0;
}
// create png info struct
end_info = png_create_info_struct(png_ptr);
if (!end_info)
{
fprintf(stderr, "error: png_create_info_struct returned 0.\n");
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
fclose(fp);
return 0;
}
// the code in this if statement gets called if libpng encounters an error
if (setjmp(png_jmpbuf(png_ptr))) {
fprintf(stderr, "error from libpng\n");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
return 0;
}
// init png reading
png_init_io(png_ptr, fp);
// let libpng know you already read the first 8 bytes
png_set_sig_bytes(png_ptr, 8);
// read all the info up to the image data
png_read_info(png_ptr, info_ptr);
// variables to pass to get info
// get info about png
png_get_IHDR(png_ptr, info_ptr, &temp_width, &temp_height, &bit_depth, &color_type, NULL, NULL, NULL);
#if 0
if (width ) {
width = temp_width;
}
if (height ) {
height = temp_height;
}
#endif
// Update the png info struct.
png_read_update_info(png_ptr, info_ptr);
// Row size in bytes.
rowbytes = png_get_rowbytes(png_ptr, info_ptr);
// glTexImage2d requires rows to be 4-byte aligned
rowbytes += 3 - ((rowbytes-1) % 4);
// Allocate the image_data as a big block, to be given to opengl
image_data = (png_byte*)malloc(rowbytes * temp_height * sizeof(png_byte)+15);
if (image_data == NULL)
{
fprintf(stderr, "error: could not allocate memory for PNG image data\n");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
return 0;
}
// row_pointers is for pointing to image_data for reading the png with libpng
row_pointers = (png_bytep*)malloc(temp_height * sizeof(png_bytep));
if (row_pointers == NULL)
{
fprintf(stderr, "error: could not allocate memory for PNG row pointers\n");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
free(image_data);
fclose(fp);
return 0;
}
// set the individual row_pointers to point at the correct offsets of image_data
for (i = 0; i < temp_height; i++)
{
row_pointers[temp_height - 1 - i] = image_data + i * rowbytes;
}
// read the png into image_data through row_pointers
png_read_image(png_ptr, row_pointers);
// Generate the OpenGL texture object
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, temp_width, temp_height, 0, GL_RGB, GL_UNSIGNED_BYTE, image_data);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
// clean up
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
free(image_data);
free(row_pointers);
fclose(fp);
return texture;
}
int
png_include_image (pdf_ximage *ximage, FILE *png_file)
{
pdf_obj *stream;
pdf_obj *stream_dict;
pdf_obj *colorspace, *mask, *intent;
png_bytep stream_data_ptr;
int trans_type;
ximage_info info;
/* Libpng stuff */
png_structp png_ptr;
png_infop png_info_ptr;
png_byte bpc, color_type;
png_uint_32 width, height, rowbytes;
pdf_ximage_init_image_info(&info);
stream = NULL;
stream_dict = NULL;
colorspace = mask = intent = NULL;
rewind (png_file);
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, warn);
if (png_ptr == NULL ||
(png_info_ptr = png_create_info_struct (png_ptr)) == NULL) {
WARN("%s: Creating Libpng read/info struct failed.", PNG_DEBUG_STR);
if (png_ptr)
png_destroy_read_struct(&png_ptr, NULL, NULL);
return -1;
}
#if PNG_LIBPNG_VER >= 10603
/* ignore possibly incorrect CMF bytes */
png_set_option(png_ptr, PNG_MAXIMUM_INFLATE_WINDOW, PNG_OPTION_ON);
#endif
/* Inititializing file IO. */
png_init_io (png_ptr, png_file);
/* Read PNG info-header and get some info. */
png_read_info(png_ptr, png_info_ptr);
color_type = png_get_color_type (png_ptr, png_info_ptr);
width = png_get_image_width (png_ptr, png_info_ptr);
height = png_get_image_height(png_ptr, png_info_ptr);
bpc = png_get_bit_depth (png_ptr, png_info_ptr);
/* We do not need 16-bpc color. Ask libpng to convert down to 8-bpc. */
if (bpc > 8) {
png_set_strip_16(png_ptr);
bpc = 8;
}
/* Ask libpng to gamma-correct.
* It is wrong to assume screen gamma value 2.2 but...
* We do gamma correction here only when uncalibrated color space is used.
*/
if (!png_get_valid(png_ptr, png_info_ptr, PNG_INFO_iCCP) &&
!png_get_valid(png_ptr, png_info_ptr, PNG_INFO_sRGB) &&
!png_get_valid(png_ptr, png_info_ptr, PNG_INFO_cHRM) &&
!png_get_valid(png_ptr, png_info_ptr, PNG_INFO_sRGB) &&
png_get_valid(png_ptr, png_info_ptr, PNG_INFO_gAMA)) {
double G = 1.0;
png_get_gAMA (png_ptr, png_info_ptr, &G);
png_set_gamma(png_ptr, 2.2, G);
}
trans_type = check_transparency(png_ptr, png_info_ptr);
/* check_transparency() does not do updata_info() */
png_read_update_info(png_ptr, png_info_ptr);
rowbytes = png_get_rowbytes(png_ptr, png_info_ptr);
/* Values listed below will not be modified in the remaining process. */
info.width = width;
info.height = height;
info.bits_per_component = bpc;
if (compat_mode)
info.xdensity = info.ydensity = 72.0 / 100.0;
else
{
png_uint_32 xppm = png_get_x_pixels_per_meter(png_ptr, png_info_ptr);
png_uint_32 yppm = png_get_y_pixels_per_meter(png_ptr, png_info_ptr);
if (xppm > 0)
info.xdensity = 72.0 / 0.0254 / xppm;
if (yppm > 0)
info.ydensity = 72.0 / 0.0254 / yppm;
}
stream = pdf_new_stream (STREAM_COMPRESS);
stream_dict = pdf_stream_dict(stream);
stream_data_ptr = (png_bytep) NEW(rowbytes*height, png_byte);
read_image_data(png_ptr, stream_data_ptr, height, rowbytes);
/* Non-NULL intent means there is valid sRGB chunk. */
intent = get_rendering_intent(png_ptr, png_info_ptr);
if (intent)
pdf_add_dict(stream_dict, pdf_new_name("Intent"), intent);
switch (color_type) {
case PNG_COLOR_TYPE_PALETTE:
colorspace = create_cspace_Indexed(png_ptr, png_info_ptr);
switch (trans_type) {
case PDF_TRANS_TYPE_BINARY:
/* Color-key masking */
mask = create_ckey_mask(png_ptr, png_info_ptr);
break;
case PDF_TRANS_TYPE_ALPHA:
/* Soft mask */
mask = create_soft_mask(png_ptr, png_info_ptr, stream_data_ptr, width, height);
break;
default:
/* Nothing to be done here.
* No tRNS chunk or image already composited with background color.
*/
break;
}
break;
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_RGB_ALPHA:
if (png_get_valid(png_ptr, png_info_ptr, PNG_INFO_iCCP))
colorspace = create_cspace_ICCBased(png_ptr, png_info_ptr);
else if (intent) {
colorspace = create_cspace_sRGB(png_ptr, png_info_ptr);
} else {
colorspace = create_cspace_CalRGB(png_ptr, png_info_ptr);
}
if (!colorspace)
colorspace = pdf_new_name("DeviceRGB");
switch (trans_type) {
case PDF_TRANS_TYPE_BINARY:
mask = create_ckey_mask(png_ptr, png_info_ptr);
break;
/* rowbytes changes 4 to 3 at here */
case PDF_TRANS_TYPE_ALPHA:
mask = strip_soft_mask(png_ptr, png_info_ptr,
stream_data_ptr, &rowbytes, width, height);
break;
default:
mask = NULL;
}
info.num_components = 3;
break;
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_GRAY_ALPHA:
if (png_get_valid(png_ptr, png_info_ptr, PNG_INFO_iCCP))
colorspace = create_cspace_ICCBased(png_ptr, png_info_ptr);
else if (intent) {
colorspace = create_cspace_sRGB(png_ptr, png_info_ptr);
} else {
colorspace = create_cspace_CalGray(png_ptr, png_info_ptr);
}
if (!colorspace)
colorspace = pdf_new_name("DeviceGray");
switch (trans_type) {
case PDF_TRANS_TYPE_BINARY:
mask = create_ckey_mask(png_ptr, png_info_ptr);
break;
case PDF_TRANS_TYPE_ALPHA:
mask = strip_soft_mask(png_ptr, png_info_ptr,
stream_data_ptr, &rowbytes, width, height);
break;
default:
mask = NULL;
}
info.num_components = 1;
break;
default:
WARN("%s: Unknown PNG colortype %d.", PNG_DEBUG_STR, color_type);
}
pdf_add_dict(stream_dict, pdf_new_name("ColorSpace"), colorspace);
pdf_add_stream(stream, stream_data_ptr, rowbytes*height);
RELEASE(stream_data_ptr);
if (mask) {
if (trans_type == PDF_TRANS_TYPE_BINARY)
pdf_add_dict(stream_dict, pdf_new_name("Mask"), mask);
else if (trans_type == PDF_TRANS_TYPE_ALPHA) {
pdf_add_dict(stream_dict, pdf_new_name("SMask"), pdf_ref_obj(mask));
pdf_release_obj(mask);
} else {
WARN("%s: Unknown transparency type...???", PNG_DEBUG_STR);
pdf_release_obj(mask);
}
}
/* Finally read XMP Metadata
* See, XMP Specification Part 3, Storage in Files
* http://www.adobe.com/jp/devnet/xmp.html
*
* We require libpng version >= 1.6.14 since prior versions
* of libpng had a bug that incorrectly treat the compression
* flag of iTxt chunks.
*/
#if PNG_LIBPNG_VER >= 10614
if (pdf_get_version() >= 4) {
png_textp text_ptr;
pdf_obj *XMP_stream, *XMP_stream_dict;
int i, num_text;
int have_XMP = 0;
num_text = png_get_text(png_ptr, png_info_ptr, &text_ptr, NULL);
for (i = 0; i < num_text; i++) {
if (!memcmp(text_ptr[i].key, "XML:com.adobe.xmp", 17)) {
/* XMP found */
if (text_ptr[i].compression != PNG_ITXT_COMPRESSION_NONE ||
text_ptr[i].itxt_length == 0)
WARN("%s: Invalid value(s) in iTXt chunk for XMP Metadata.", PNG_DEBUG_STR);
else if (have_XMP)
WARN("%s: Multiple XMP Metadata. Don't know how to treat it.", PNG_DEBUG_STR);
else {
/* We compress XMP metadata for included images here.
* It is not recommended to compress XMP metadata for PDF documents but
* we compress XMP metadata for included images here to avoid confusing
* application programs that only want PDF document global XMP metadata
* and scan for that.
*/
XMP_stream = pdf_new_stream(STREAM_COMPRESS);
XMP_stream_dict = pdf_stream_dict(XMP_stream);
pdf_add_dict(XMP_stream_dict,
pdf_new_name("Type"), pdf_new_name("Metadata"));
pdf_add_dict(XMP_stream_dict,
pdf_new_name("Subtype"), pdf_new_name("XML"));
pdf_add_stream(XMP_stream, text_ptr[i].text, text_ptr[i].itxt_length);
pdf_add_dict(stream_dict,
pdf_new_name("Metadata"), pdf_ref_obj(XMP_stream));
pdf_release_obj(XMP_stream);
have_XMP = 1;
}
}
}
}
#endif /* PNG_LIBPNG_VER */
png_read_end(png_ptr, NULL);
/* Cleanup */
if (png_info_ptr)
png_destroy_info_struct(png_ptr, &png_info_ptr);
if (png_ptr)
png_destroy_read_struct(&png_ptr, NULL, NULL);
pdf_ximage_set_image(ximage, &info, stream);
return 0;
}