void save_to_png(char* filename) {
int i;
// use malloc rather than the stack since an array of several million bytes will overflow the stack
uint8_t *pixels = malloc(width * height * 3 * sizeof(uint8_t));
// switch the framebuffer in order to force the full texture to be saved
glBindFramebuffer(GL_FRAMEBUFFER, framebuffers[fb]);
glViewport(0, 0, width, height);
// copy pixels from screen
glActiveTexture(0);
glBindTexture(GL_TEXTURE_2D, textures[fb]);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, (GLvoid *)pixels);
// use libpng to write the pixels to a png image
png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png) goto png_fail;
png_infop info = png_create_info_struct(png);
if (!info) {
png_destroy_write_struct(&png, &info);
goto png_fail;
}
if(filename == NULL) {
// filename => current time in milliseconds
char tmp[256];
snprintf(tmp, 256, "%llu.png", get_time_us() * 1000);
filename = tmp;
}
FILE *file = fopen(filename, "wb");
if (!file) {
png_destroy_write_struct(&png, &info);
goto png_fail;
}
png_init_io(png, file);
png_set_IHDR(png, info, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_colorp palette = png_malloc(png, PNG_MAX_PALETTE_LENGTH * sizeof(png_color));
if (!palette) {
fclose(file);
png_destroy_write_struct(&png, &info);
goto png_fail;
}
png_set_PLTE(png, info, palette, PNG_MAX_PALETTE_LENGTH);
png_write_info(png, info);
png_set_packing(png);
png_bytepp rows = (png_bytepp)png_malloc(png, height * sizeof(png_bytep));
for (i = 0; i < height; ++i) {
rows[i] = (png_bytep)(pixels + (height - i - 1) * width * 3);
}
png_write_image(png, rows);
png_write_end(png, info);
png_free(png, palette);
png_destroy_write_struct(&png, &info);
fclose(file);
free(pixels);
printf("PNG: finished at %llu\n", get_time_us());
render_prepare_screen();
return;
png_fail:
fail("Failed to create PNG\n");
}
static int write_png_palette(
png_struct *png_ptr, png_info *info_ptr, SDL_Surface *scr)
{
int i, result = -1;
png_color *palette;
palette = malloc(sizeof(*palette) * scr->format->palette->ncolors);
if (palette)
{
// Convert SDL palette to libpng
for (i = 0; i < scr->format->palette->ncolors; i++) {
palette[i].red = scr->format->palette->colors[i].r;
palette[i].green = scr->format->palette->colors[i].g;
palette[i].blue = scr->format->palette->colors[i].b;
}
png_set_PLTE(png_ptr, info_ptr,
palette, scr->format->palette->ncolors);
free(palette);
result = 0;
}
return result;
}
pngquant_error rwpng_write_image8(FILE *outfile, png8_image *mainprog_ptr)
{
png_structp png_ptr;
png_infop info_ptr;
pngquant_error retval = rwpng_write_image_init((png_image*)mainprog_ptr, &png_ptr, &info_ptr, outfile);
if (retval) return retval;
/* set the image parameters appropriately */
int sample_depth;
if (mainprog_ptr->num_palette <= 2)
sample_depth = 1;
else if (mainprog_ptr->num_palette <= 4)
sample_depth = 2;
else if (mainprog_ptr->num_palette <= 16)
sample_depth = 4;
else
sample_depth = 8;
png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
sample_depth, PNG_COLOR_TYPE_PALETTE,
0, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_BASE);
png_set_PLTE(png_ptr, info_ptr, &mainprog_ptr->palette[0], mainprog_ptr->num_palette);
if (mainprog_ptr->num_trans > 0)
png_set_tRNS(png_ptr, info_ptr, mainprog_ptr->trans, mainprog_ptr->num_trans, NULL);
rwpng_write_end(&info_ptr, &png_ptr, (png_image*)mainprog_ptr);
return SUCCESS;
}
static int save_png_sub(RefImage *image, Value w)
{
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
png_infop info_ptr = png_create_info_struct(png_ptr);
png_bytepp rows = malloc(sizeof(png_bytep) * image->height);
png_bytep data = (png_bytep)image->data;
int color_type = PNG_COLOR_TYPE_RGB;
int i;
png_set_write_fn(png_ptr, &w, png_write_callback, png_flush_callback);
switch (image->bands) {
case BAND_L:
color_type = PNG_COLOR_TYPE_GRAY;
break;
case BAND_LA:
color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
break;
case BAND_P:
color_type = PNG_COLOR_TYPE_PALETTE;
break;
case BAND_RGB:
color_type = PNG_COLOR_TYPE_RGB;
break;
case BAND_RGBA:
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
free(rows);
return FALSE;
}
png_set_IHDR(png_ptr, info_ptr,
image->width, image->height, 8, color_type,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
for (i = 0; i < image->height; i++) {
rows[i] = data + image->pitch * i;
}
if (image->bands == BAND_P) {
uint32_t *pal = image->palette;
uint8_t trans[PALETTE_NUM];
png_color pcolor[PALETTE_NUM];
if (palette_has_alpha(pal)) {
for (i = 0; i < PALETTE_NUM; i++) {
trans[i] = (pal[i] & COLOR_A_MASK) >> COLOR_A_SHIFT;
}
png_set_tRNS(png_ptr, info_ptr, trans, PALETTE_NUM, NULL);
}
for (i = 0; i < PALETTE_NUM; i++) {
pcolor[i].red = (pal[i] & COLOR_R_MASK) >> COLOR_R_SHIFT;
pcolor[i].green = (pal[i] & COLOR_G_MASK) >> COLOR_G_SHIFT;
pcolor[i].blue = (pal[i] & COLOR_B_MASK) >> COLOR_B_SHIFT;
}
png_set_PLTE(png_ptr, info_ptr, pcolor, PALETTE_NUM);
}
void writeSetup2(png_structp png_ptr_write, png_infop info_ptr_write,
png_structp png_ptr_read, png_infop info_ptr_read)
{
/* IHDR */
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int colour_type;
int interlace_method;
int compression_method;
int filter_method;
/* PLTE */
png_colorp palette = NULL;
int palette_size = 0;
/* gAMA */
double gamma;
/* tRNS */
png_bytep trans;
int num_trans;
png_color_16p trans_values;
/* bKGD */
png_color_16p background;
png_get_IHDR(png_ptr_read, info_ptr_read, &width, &height,
&bit_depth, &colour_type, &interlace_method,
&compression_method, &filter_method);
png_set_IHDR(png_ptr_write, info_ptr_write, width, height,
bit_depth, colour_type, interlace_method,
compression_method, filter_method);
if(png_get_valid(png_ptr_read, info_ptr_read, PNG_INFO_PLTE))
{
png_get_PLTE(png_ptr_read, info_ptr_read, &palette, &palette_size);
png_set_PLTE(png_ptr_write, info_ptr_write, palette, palette_size);
}
if(png_get_valid(png_ptr_read, info_ptr_read, PNG_INFO_gAMA))
{
png_get_gAMA(png_ptr_read, info_ptr_read, &gamma);
png_set_gAMA(png_ptr_write, info_ptr_write, gamma);
}
if(png_get_valid(png_ptr_read, info_ptr_read, PNG_INFO_tRNS))
{
png_get_tRNS(png_ptr_read, info_ptr_read, &trans, &num_trans, &trans_values);
png_set_tRNS(png_ptr_write, info_ptr_write, trans, num_trans, trans_values);
}
if(png_get_valid(png_ptr_read, info_ptr_read, PNG_INFO_bKGD))
{
png_get_bKGD(png_ptr_read, info_ptr_read, &background);
png_set_bKGD(png_ptr_write, info_ptr_write, background);
}
}
/** Write out the PLTE (and possibly tRNS) chunk to the png. This will create the
* palette data to set in the PLTE chunk and set it, and if the colorkey is set
* for the surface an appropriate tRNS chunk is generated.
*
* \param png_ptr A pointer to the png write structure.
* \param info_ptr A pointer to the png info structure.
* \param surf The surface that is being written to the png.
* \return -1 on error, 0 if the palette chunk was written without problems.
*/
static int write_palette_chunk(png_structp png_ptr, png_infop info_ptr, SDL_Surface *surf)
{
png_colorp palette;
Uint8 *alphas;
int slot;
SDL_PixelFormat *fmt = surf -> format;
SDL_Color *sourcepal = fmt -> palette -> colors;
// Write the image header first...
png_set_IHDR(png_ptr, info_ptr, surf -> w, surf -> h, 8, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// now sort out the palette
if(!(palette = (png_colorp)malloc(fmt -> palette -> ncolors * sizeof(png_color)))) {
SDL_SetError("Unable to create memory for palette storage");
return -1;
}
// Copy the palette over. Can't just use a straight
// memcpy as sdl palettes have pad bytes.
for(slot = 0; slot < fmt -> palette -> ncolors; ++slot) {
memcpy(&palette[slot], &sourcepal[slot], 3);
}
// Set it...
png_set_PLTE(png_ptr, info_ptr, palette, fmt -> palette -> ncolors);
// Done with the palette now
free(palette);
Uint32 colorkey;
int ck = SDL_GetColorKey(surf, &colorkey);
// If we have a colour key, we need to set up the alphas for each palette colour
if(ck == 0) {
// According the the PNG spec (section 4.2.1.1) we only need enough entries
// to store transparencies up to the transparent pixel.
if(!(alphas = (Uint8 *)malloc((colorkey + 1) * sizeof(Uint8)))) {
SDL_SetError("Unable to create memory for transparency storage");
return -1;
}
// Set all of the alpha values to full
memset(alphas, 255, (colorkey + 1) * sizeof(Uint8));
// And handle the transparent pixel
alphas[colorkey] = 0;
// Write the chunk, and then we're done with the transparencies
png_set_tRNS(png_ptr, info_ptr, alphas, colorkey + 1, NULL);
free(alphas);
}
return 0;
}
/*
* Saves a byte array stored in pixels of width w and height h as a png into
* filename
*/
GLuint save_png (const char * filename, GLubyte * pixels, GLuint w, GLuint h)
{
png_structp png;
png_infop info;
png_colorp palette;
png_bytepp rows;
FILE * fp;
GLuint i;
png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png) return 1;
info = png_create_info_struct(png);
if(!info) {
png_destroy_write_struct(&png, NULL);
return 1;
}
fp = fopen(filename, "wb");
if (!fp) {
png_destroy_write_struct(&png, &info);
return 1;
}
png_init_io(png, fp);
png_set_IHDR(png, info, w, h, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
palette = (png_colorp) png_malloc(png, PNG_MAX_PALETTE_LENGTH
* sizeof(png_color));
if (!palette) {
fclose(fp);
png_destroy_write_struct(&png, &info);
return 1;
}
png_set_PLTE(png, info, palette, PNG_MAX_PALETTE_LENGTH);
png_write_info(png, info);
png_set_packing(png);
rows = (png_bytepp) png_malloc(png, h * sizeof(png_bytep));
for (i = 0; i < h; ++i)
rows[i] = (png_bytep) (pixels + (h - i - 1) * w * 3);
png_write_image(png, rows);
png_write_end(png, info);
png_free(png, palette);
png_destroy_write_struct(&png, &info);
fclose(fp);
free(rows);
return 0;
}
void gdImagePng(gdImagePtr im, FILE *out)
{
int i;
png_colorp palette;
png_structp png_write_ptr =
png_create_write_struct(PNG_LIBPNG_VER_STRING,
(png_voidp)NULL,
/* we would need to point to error handlers
here to do it properly */
(png_error_ptr)NULL, (png_error_ptr)NULL);
png_infop info_ptr = png_create_info_struct(png_write_ptr);
if (setjmp(gdPngJmpbufStruct.jmpbuf)) {
png_destroy_write_struct(&png_write_ptr, &info_ptr);
return;
}
palette = (png_colorp)png_malloc (png_write_ptr,
im->colorsTotal*sizeof(png_color));
if (palette == NULL) {
png_destroy_write_struct(&png_write_ptr, &info_ptr);
return;
}
png_init_io(png_write_ptr, out);
png_set_write_status_fn(png_write_ptr, NULL);
png_set_IHDR(png_write_ptr,info_ptr,
im->sx,im->sy,im->colorsTotal > 16 ? 8:4,
PNG_COLOR_TYPE_PALETTE,
im->interlace ? PNG_INTERLACE_ADAM7: PNG_INTERLACE_NONE ,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
for(i=0; i<im->colorsTotal; i++) {
palette[i].red = im->red[i];
palette[i].green = im->green[i];
palette[i].blue = im->blue[i];
}
png_set_PLTE(png_write_ptr, info_ptr, palette, im->colorsTotal);
/* choose between speed (1) and space (9) optimization */
/* we want to be fast ... */
png_set_compression_level(png_write_ptr,1);
png_set_filter(png_write_ptr,PNG_FILTER_TYPE_BASE,PNG_NO_FILTERS);
/* store file info */
png_write_info(png_write_ptr, info_ptr);
png_set_packing(png_write_ptr);
png_write_image(png_write_ptr, im->pixels);
png_write_end(png_write_ptr, info_ptr);
png_free(png_write_ptr, palette);
png_destroy_write_struct(&png_write_ptr, &info_ptr);
}
/*
* Change the size of the palette buffer.
* Changing info_ptr->num_palette directly, avoiding reallocation, should
* have been sufficient, but can't be done using the current libpng API.
*/
static void opng_realloc_PLTE(png_structp png_ptr, png_infop info_ptr, int num_palette)
{
png_colorp palette;
int src_num_palette = 0;
png_get_PLTE(png_ptr, info_ptr, &palette, &src_num_palette);
if (num_palette == src_num_palette)
{return;}
png_color buffer[PNG_MAX_PALETTE_LENGTH];
memcpy(buffer, palette, num_palette * sizeof(png_color));
if (num_palette > src_num_palette)
memset(buffer + src_num_palette, 0,
(num_palette - src_num_palette) * sizeof(png_color));
png_set_PLTE(png_ptr, info_ptr, buffer, num_palette);
}
extern void bitmap_write(struct bitmap *bitmap)
{
if (!output_path && is_tty_stdout())
message_fatal("Data cannot be written to a terminal");
FILE *fp = output_path ? fopen(output_path, "wb") : stdout;
if (fp == NULL)
message_fatal("Unable to open file for writing");
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (png_ptr == NULL)
message_fatal("Unable to create png struct");
png_infop info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
message_fatal("Unable to create png info struct");
if (setjmp(png_jmpbuf(png_ptr))) {
fclose(fp);
png_destroy_write_struct(&png_ptr, &info_ptr);
message_fatal("Error writing png file");
}
png_init_io(png_ptr, fp);
png_set_IHDR(png_ptr, info_ptr, bitmap->width, bitmap->height, 8,
PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_color *palette = palette_create();
png_set_PLTE(png_ptr, info_ptr, palette, 256);
png_bytep row_pointers[bitmap->height];
for (unsigned y = 0; y < bitmap->height; y++)
row_pointers[y] = bitmap->data + bitmap->width * y;
png_write_info(png_ptr, info_ptr);
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
palette_release(palette);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
}
static void
pngx_set_GIF_palette(png_structp png_ptr, png_infop info_ptr,
unsigned char *color_table, unsigned int num_colors)
{
png_color palette[256];
unsigned int i;
PNGX_ASSERT(color_table != NULL && num_colors <= 256);
for (i = 0; i < num_colors; ++i)
{
palette[i].red = color_table[3 * i];
palette[i].green = color_table[3 * i + 1];
palette[i].blue = color_table[3 * i + 2];
}
png_set_PLTE(png_ptr, info_ptr, palette, (int)num_colors);
}
/*
* bta_transparent_toPNG
*/
void bta_transparent_toPNG(bta_cell_t *in, btstring_t *fname)
{
FILE *outfp;
png_structp png_ptr;
png_infop info_ptr;
uint32_t i;
int trans = 0;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
printf("Failed allocating png_ptr\n");
return;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
printf("Failed allocating info_ptr\n");
return;
}
outfp = fopen(fname->buf, "wb");
if (outfp == NULL) {
printf("Error opening %s\n", fname->buf);
return;
}
png_init_io(png_ptr, outfp);
png_set_IHDR(png_ptr, info_ptr, in->width, in->height, 8, \
PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, \
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_set_PLTE(png_ptr, info_ptr, egapalette, 16);
png_set_tRNS(png_ptr, info_ptr, (png_bytep)&trans, 1, NULL);
png_write_info(png_ptr, info_ptr);
for (i = 0; i < in->height; i++)
png_write_row(png_ptr, &in->gfx->buf[i * in->width]);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(outfp);
bts_free(fname);
}
void SetPngPalette(png_structp png_ptr, png_infop info_ptr, struct Palette *palette)
{
png_colorp colors = malloc(palette->numColors * sizeof(png_color));
if (colors == NULL)
FATAL_ERROR("Failed to allocate PNG palette.\n");
for (int i = 0; i < palette->numColors; i++) {
colors[i].red = palette->colors[i].red;
colors[i].green = palette->colors[i].green;
colors[i].blue = palette->colors[i].blue;
}
png_set_PLTE(png_ptr, info_ptr, colors, palette->numColors);
free(colors);
}
void Texture::SaveTexture( const OutPutTextureData& saveto )
{
unsigned long i;
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette;
png_byte *image;
png_bytep *row_pointers;
IFile* writefile = IOSystem::Instance().FileFactory(saveto.m_Path);
writefile->OpenFile( IFile::AT_READ );
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info_ptr = png_create_info_struct(png_ptr);
png_set_write_fn( png_ptr, writefile, png_rw, png_flush );
//png_init_io(png_ptr, writefile.BaseFile() );
int colortype, bitesize;
switch( saveto.m_Pixel )
{
case Device::PF_R8G8B8: colortype = PNG_COLOR_TYPE_RGB; bitesize = 3; break;
case Device::PF_R8G8B8A8: colortype = PNG_COLOR_TYPE_RGBA; bitesize = 4; break;
}
png_set_IHDR(png_ptr, info_ptr, saveto.m_Size.m_x, saveto.m_Size.m_y, 8, colortype,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH * sizeof (png_color));
png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
row_pointers = (png_bytep *)malloc(saveto.m_Size.m_y * sizeof(png_bytep));
for (i = 0; i < saveto.m_Size.m_y; i++)
{
row_pointers[i] = (png_bytep)&saveto.m_Data[i * saveto.m_Size.m_y * bitesize];
}
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
png_free(png_ptr, palette);
palette = NULL;
png_destroy_write_struct(&png_ptr, &info_ptr);
free(row_pointers);
row_pointers = NULL;
writefile->CloseFile( );
IOSystem::Instance().FileDestroy( writefile );
}
int savePNG(const char * fileName,uint32_t width,uint32_t height,void * ptr,uint8_t*pal,unsigned pn){
//saves a 24bit png with rgb byte order
png_byte * dat=(png_byte*)ptr;//convert to uint8_t
FILE * fp=fopen(fileName,"wb");
if (!fp)
return 1;
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)0,0,0);
if (!png_ptr){
fclose(fp);
return 1;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr){
png_destroy_write_struct(&png_ptr,(png_infopp)NULL);
return 1;
}
if (setjmp(png_jmpbuf(png_ptr))){
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
return 1;
}
png_init_io(png_ptr, fp);
png_set_IHDR(png_ptr, info_ptr, width, height,8,pal?PNG_COLOR_TYPE_PALETTE:PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);//must be called before other png_set_*() functions
png_color_struct*palTmp=0;
if(pal){
palTmp=(png_color_struct*)malloc(pn*sizeof(png_color_struct));
for(unsigned i=0;i<pn;++i){
palTmp[i].red=pal[i*3];
palTmp[i].green=pal[i*3+1];
palTmp[i].blue=pal[i*3+2];
}
png_set_PLTE(png_ptr,info_ptr,palTmp,pn);
}
png_set_compression_level(png_ptr,Z_BEST_COMPRESSION);
uint32_t y;
png_set_user_limits(png_ptr, width, height);
png_write_info(png_ptr, info_ptr);
for (y=0;y<height;++y)
png_write_row(png_ptr, &dat[(y*width*(pal?1:3))]);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);//done with file
free(palTmp);
return 0;//will return 0 on success non-zero in error
}
void write() const
{
assert(m_png);
assert(m_info);
sync_ihdr();
if (m_color_type == color_type_palette)
{
if (! m_palette.empty())
{
png_set_PLTE(m_png, m_info,
const_cast< color* >(& m_palette[0]),
(int) m_palette.size());
}
if (! m_tRNS.empty())
{
#ifdef PNG_tRNS_SUPPORTED
png_set_tRNS(m_png, m_info,
const_cast< byte* >(& m_tRNS[0]),
m_tRNS.size(),
NULL);
#else
throw error("attempted to write tRNS chunk; recompile with PNG_tRNS_SUPPORTED");
#endif
}
}
if (m_gamma > 0)
{
#ifdef PNG_gAMA_SUPPORTED
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_gAMA(m_png, m_info, m_gamma);
#else
png_set_gAMA_fixed(m_png, m_info,
(png_fixed_point)(m_gamma * 100000));
#endif
#else
throw error("attempted to write gAMA chunk; recompile with PNG_gAMA_SUPPORTED");
#endif
}
png_write_info(m_png, m_info);
}
pngquant_error rwpng_write_image8(FILE *outfile, png8_image *mainprog_ptr)
{
png_structp png_ptr;
png_infop info_ptr;
pngquant_error retval = rwpng_write_image_init((png_image*)mainprog_ptr, &png_ptr, &info_ptr, outfile);
if (retval) return retval;
// Palette images generally don't gain anything from filtering
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_VALUE_NONE);
rwpng_set_gamma(info_ptr, png_ptr, mainprog_ptr->gamma);
/* set the image parameters appropriately */
int sample_depth;
if (mainprog_ptr->num_palette <= 2)
sample_depth = 1;
else if (mainprog_ptr->num_palette <= 4)
sample_depth = 2;
else if (mainprog_ptr->num_palette <= 16)
sample_depth = 4;
else
sample_depth = 8;
png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
sample_depth, PNG_COLOR_TYPE_PALETTE,
0, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_BASE);
png_set_PLTE(png_ptr, info_ptr, &mainprog_ptr->palette[0], mainprog_ptr->num_palette);
if (mainprog_ptr->num_trans > 0)
png_set_tRNS(png_ptr, info_ptr, mainprog_ptr->trans, mainprog_ptr->num_trans, NULL);
png_bytepp row_pointers = rwpng_create_row_pointers(info_ptr, png_ptr, mainprog_ptr->indexed_data, mainprog_ptr->height, mainprog_ptr->width);
rwpng_write_end(&info_ptr, &png_ptr, row_pointers);
free(row_pointers);
return SUCCESS;
}
UT_Error IE_ImpGraphic_Win32Native::Convert_BMP_Palette(UT_ByteBuf* pBB)
{
/* Reset error handling for libpng */
if (setjmp(m_pPNG->jmpbuf))
{
png_destroy_write_struct(&m_pPNG, &m_pPNGInfo);
return UT_ERROR;
}
png_set_IHDR ( m_pPNG,
m_pPNGInfo,
m_iWidth,
m_iHeight,
m_iBitsPerPlane,
PNG_COLOR_TYPE_PALETTE,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT );
UT_uint32 iOffset = m_iHeaderSize + 14;
UT_uint32 numClrs = (m_iClrUsed > 0) ?
m_iClrUsed :
(m_iOffset - iOffset)/((m_bOldBMPFormat)?3:4);
png_colorp palette = static_cast<png_colorp>(png_malloc(m_pPNG, numClrs * sizeof(png_color)));
for (UT_uint32 i=0; i < numClrs; i++)
{
palette[i].blue = ReadByte(pBB,iOffset++);
palette[i].green = ReadByte(pBB,iOffset++);
palette[i].red = ReadByte(pBB,iOffset++);
if(!m_bOldBMPFormat) iOffset++;
}
if (iOffset > m_iOffset) return UT_IE_BOGUSDOCUMENT;
png_set_PLTE( m_pPNG, m_pPNGInfo, palette, numClrs );
return UT_OK;
}
int spupng_write_png(struct spupng_t *sp, struct eia608_screen* data,
png_structp png_ptr, png_infop info_ptr,
png_bytep image,
png_bytep* row_pointer,
unsigned int ww, unsigned int wh)
{
unsigned int i;
if (setjmp(png_jmpbuf(png_ptr)))
return 0;
png_init_io (png_ptr, sp->fppng);
png_set_IHDR (png_ptr,
info_ptr,
ww,
wh,
/* bit_depth */ 8,
PNG_COLOR_TYPE_PALETTE,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_set_PLTE (png_ptr, info_ptr, palette, sizeof(palette) / sizeof(palette[0]));
png_set_tRNS (png_ptr, info_ptr, alpha, sizeof(alpha) / sizeof(alpha[0]), NULL);
png_set_gAMA (png_ptr, info_ptr, 1.0 / 2.2);
png_write_info (png_ptr, info_ptr);
for (i = 0; i < wh; i++)
row_pointer[i] = image + i * ww;
png_write_image (png_ptr, row_pointer);
png_write_end (png_ptr, info_ptr);
return 1;
}
bool CCImage::_saveImageToPNG(const char * pszFilePath, bool bIsToRGB)
{
bool bRet = false;
do
{
CC_BREAK_IF(NULL == pszFilePath);
FILE *fp;
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette;
png_bytep *row_pointers;
fp = fopen(pszFilePath, "wb");
CC_BREAK_IF(NULL == fp);
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (NULL == png_ptr)
{
fclose(fp);
break;
}
info_ptr = png_create_info_struct(png_ptr);
if (NULL == info_ptr)
{
fclose(fp);
png_destroy_write_struct(&png_ptr, NULL);
break;
}
#if (CC_TARGET_PLATFORM != CC_PLATFORM_BADA)
if (setjmp(png_jmpbuf(png_ptr)))
{
fclose(fp);
png_destroy_write_struct(&png_ptr, &info_ptr);
break;
}
#endif
png_init_io(png_ptr, fp);
if (!bIsToRGB && m_bHasAlpha)
{
png_set_IHDR(png_ptr, info_ptr, m_nWidth, m_nHeight, 8, PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
}
else
{
png_set_IHDR(png_ptr, info_ptr, m_nWidth, m_nHeight, 8, PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
}
palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH * sizeof (png_color));
png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
row_pointers = (png_bytep *)malloc(m_nHeight * sizeof(png_bytep));
if(row_pointers == NULL)
{
fclose(fp);
png_destroy_write_struct(&png_ptr, &info_ptr);
break;
}
if (!m_bHasAlpha)
{
for (int i = 0; i < (int)m_nHeight; i++)
{
row_pointers[i] = (png_bytep)m_pData + i * m_nWidth * 3;
}
png_write_image(png_ptr, row_pointers);
free(row_pointers);
row_pointers = NULL;
}
else
{
if (bIsToRGB)
{
unsigned char *pTempData = new unsigned char[m_nWidth * m_nHeight * 3];
if (NULL == pTempData)
{
fclose(fp);
png_destroy_write_struct(&png_ptr, &info_ptr);
break;
}
for (int i = 0; i < m_nHeight; ++i)
{
for (int j = 0; j < m_nWidth; ++j)
{
pTempData[(i * m_nWidth + j) * 3] = m_pData[(i * m_nWidth + j) * 4];
pTempData[(i * m_nWidth + j) * 3 + 1] = m_pData[(i * m_nWidth + j) * 4 + 1];
pTempData[(i * m_nWidth + j) * 3 + 2] = m_pData[(i * m_nWidth + j) * 4 + 2];
}
}
for (int i = 0; i < (int)m_nHeight; i++)
{
row_pointers[i] = (png_bytep)pTempData + i * m_nWidth * 3;
}
png_write_image(png_ptr, row_pointers);
free(row_pointers);
row_pointers = NULL;
CC_SAFE_DELETE_ARRAY(pTempData);
}
else
{
for (int i = 0; i < (int)m_nHeight; i++)
{
row_pointers[i] = (png_bytep)m_pData + i * m_nWidth * 4;
}
png_write_image(png_ptr, row_pointers);
free(row_pointers);
row_pointers = NULL;
}
}
png_write_end(png_ptr, info_ptr);
png_free(png_ptr, palette);
palette = NULL;
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
bRet = true;
} while (0);
return bRet;
}
int write_bar_graph(FILE *f, double perc, int width, int height, int border, int spacers)
{
static png_color palette[4] =
{
{ 0, 0, 0}, /* RGB color for border */
{255, 255, 255}, /* RGB color for separators */
{214, 136, 131}, /* RGB color for unfilled part of graph */
{204, 204, 227}, /* RGB color for filled part of graph */
};
int bwidth, bheight; /* Width and height including border */
double frac;
int spacer, fspacer;
int x, y;
int color;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_byte *border_row;
png_byte *bar_row;
png_byte *bp;
int status = 1; /* Assume failure */
bwidth = width + border*2;
bheight = height + border*2;
border_row = alloca(sizeof(png_byte) * bwidth);
bar_row = alloca(sizeof(png_byte) * bwidth);
if ( !border_row || !bar_row )
goto barf;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if ( !png_ptr )
goto barf;
info_ptr = png_create_info_struct(png_ptr);
if ( !info_ptr )
goto barf;
if ( setjmp(png_jmpbuf((png_ptr))) ) {
status = 1;
goto barf; /* libpng abort */
}
png_init_io(png_ptr, f);
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
png_set_IHDR(png_ptr, info_ptr, bwidth, bheight,
2, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_set_PLTE(png_ptr, info_ptr, palette, 4);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
/* Now we actually produce the data */
/* Generate the border row */
memset(border_row, 0, bwidth);
/* Generate the bar row */
bp = bar_row;
for ( x = 0 ; x < border ; x++ )
*bp++ = 0; /* Border color */
spacer = 0;
for ( x = 1 ; x <= width ; x++ ) {
frac = (double)x/(double)width;
fspacer = (int)(spacers*frac);
if ( x < width && spacer < fspacer ) {
color = 1; /* Spacer color */
} else if ( perc < frac ) {
color = 3; /* Bar color */
} else {
color = 2; /* Background color */
}
*bp++ = color;
spacer = fspacer;
}
for ( x = 0 ; x < border ; x++ )
*bp++ = 0; /* Border color */
/* Write output */
for ( y = 0 ; y < border ; y++ )
png_write_row(png_ptr, border_row);
for ( y = 0 ; y < height ; y++ )
png_write_row(png_ptr, bar_row);
for ( y = 0 ; y < border ; y++ )
png_write_row(png_ptr, border_row);
/* Done writing */
png_write_end(png_ptr, info_ptr);
status = 0; /* Success! */
barf: /* Jump here on fatal error */
png_destroy_write_struct(&png_ptr, &info_ptr);
return status;
}
bool MCImageEncodePNG(MCImageIndexedBitmap *p_indexed, IO_handle p_stream, uindex_t &r_bytes_written)
{
bool t_success = true;
MCPNGWriteContext t_context;
t_context.stream = p_stream;
t_context.byte_count = 0;
png_structp t_png_ptr = nil;
png_infop t_info_ptr = nil;
png_color *t_png_palette = nil;
png_byte *t_png_transparency = nil;
png_bytep t_data_ptr = nil;
uindex_t t_stride = 0;
/*init png stuff*/
if (t_success)
{
t_success = nil != (t_png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
(png_voidp)NULL, (png_error_ptr)NULL,
(png_error_ptr)NULL));
}
if (t_success)
t_success = nil != (t_info_ptr = png_create_info_struct(t_png_ptr));
/*in case of png error*/
if (setjmp(png_jmpbuf(t_png_ptr)))
t_success = false;
if (t_success)
png_set_write_fn(t_png_ptr,(png_voidp)&t_context,fakewrite,fakeflush);
if (t_success)
{
png_set_IHDR(t_png_ptr, t_info_ptr, p_indexed->width, p_indexed->height, 8,
PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_set_gAMA(t_png_ptr, t_info_ptr, 1/MCgamma);
}
if (t_success)
t_success = MCMemoryNewArray(p_indexed->palette_size, t_png_palette);
/*create palette for 8 bit*/
if (t_success)
{
for (uindex_t i = 0; i < p_indexed->palette_size ; i++)
{
t_png_palette[i].red = p_indexed->palette[i].red >> 8;
t_png_palette[i].green = p_indexed->palette[i].green >> 8;
t_png_palette[i].blue = p_indexed->palette[i].blue >> 8;
}
png_set_PLTE(t_png_ptr, t_info_ptr, t_png_palette, p_indexed->palette_size);
}
if (MCImageIndexedBitmapHasTransparency(p_indexed))
{
if (t_success)
t_success = MCMemoryAllocate(p_indexed->palette_size, t_png_transparency);
if (t_success)
{
memset(t_png_transparency, 0xFF, p_indexed->palette_size);
t_png_transparency[p_indexed->transparent_index] = 0x00;
png_set_tRNS(t_png_ptr, t_info_ptr, t_png_transparency, p_indexed->palette_size, NULL);
}
}
if (t_success)
png_write_info(t_png_ptr, t_info_ptr);
if (t_success)
{
t_data_ptr = (png_bytep)p_indexed->data;
t_stride = p_indexed->stride;
}
if (t_success)
{
for (uindex_t i = 0; i < p_indexed->height; i++)
{
png_write_row(t_png_ptr, t_data_ptr);
t_data_ptr += t_stride;
}
}
if (t_success)
png_write_end(t_png_ptr, t_info_ptr);
if (t_png_ptr != nil)
png_destroy_write_struct(&t_png_ptr, &t_info_ptr);
if (t_png_palette != nil)
MCMemoryDeleteArray(t_png_palette);
if (t_png_transparency != nil)
MCMemoryDeallocate(t_png_transparency);
if (t_success)
r_bytes_written = t_context.byte_count;
return t_success;
}
void save_as_png(T & file, std::vector<mapnik::rgb> const& palette,
mapnik::image_gray8 const& image,
unsigned width,
unsigned height,
unsigned color_depth,
std::vector<unsigned> const&alpha,
png_options const& opts)
{
png_voidp error_ptr=0;
png_structp png_ptr=png_create_write_struct(PNG_LIBPNG_VER_STRING,
error_ptr,0, 0);
if (!png_ptr)
{
return;
}
// switch on optimization only if supported
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200) && defined(PNG_MMX_CODE_SUPPORTED)
png_uint_32 mask, flags;
flags = png_get_asm_flags(png_ptr);
mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
png_set_asm_flags(png_ptr, flags | mask);
#endif
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_NONE);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr,static_cast<png_infopp>(0));
return;
}
jmp_buf* jmp_context = static_cast<jmp_buf*>(png_get_error_ptr(png_ptr));
if (jmp_context)
{
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_set_write_fn (png_ptr, &file, &write_data<T>, &flush_data<T>);
png_set_compression_level(png_ptr, opts.compression);
png_set_compression_strategy(png_ptr, opts.strategy);
png_set_compression_buffer_size(png_ptr, 32768);
png_set_IHDR(png_ptr, info_ptr,width,height,color_depth,
PNG_COLOR_TYPE_PALETTE,PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
png_color* pal = const_cast<png_color*>(reinterpret_cast<const png_color*>(&palette[0]));
png_set_PLTE(png_ptr, info_ptr, pal, static_cast<unsigned>(palette.size()));
// make transparent lowest indexes, so tRNS is small
if (alpha.size()>0)
{
std::vector<png_byte> trans(alpha.size());
unsigned alphaSize=0;//truncate to nonopaque values
for(unsigned i=0; i < alpha.size(); i++)
{
trans[i]=alpha[i];
if (alpha[i]<255)
{
alphaSize = i+1;
}
}
if (alphaSize>0)
{
png_set_tRNS(png_ptr, info_ptr, static_cast<png_bytep>(&trans[0]), alphaSize, 0);
}
}
png_write_info(png_ptr, info_ptr);
for (unsigned i=0;i<height;i++)
{
png_write_row(png_ptr,const_cast<png_bytep>(image.get_row(i)));
}
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
}
static int writePNG(QRcode *qrcode, const char *outfile)
{
static FILE *fp; // avoid clobbering by setjmp.
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette;
png_byte alpha_values[2];
unsigned char *row, *p, *q;
int x, y, xx, yy, bit;
int realwidth;
realwidth = (qrcode->width + margin * 2) * size;
row = (unsigned char *)malloc((realwidth + 7) / 8);
if(row == NULL) {
fprintf(stderr, "Failed to allocate memory.\n");
exit(EXIT_FAILURE);
}
if(outfile[0] == '-' && outfile[1] == '\0') {
fp = stdout;
} else {
fp = fopen(outfile, "wb");
if(fp == NULL) {
fprintf(stderr, "Failed to create file: %s\n", outfile);
perror(NULL);
exit(EXIT_FAILURE);
}
}
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(png_ptr == NULL) {
fprintf(stderr, "Failed to initialize PNG writer.\n");
exit(EXIT_FAILURE);
}
info_ptr = png_create_info_struct(png_ptr);
if(info_ptr == NULL) {
fprintf(stderr, "Failed to initialize PNG write.\n");
exit(EXIT_FAILURE);
}
if(setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
fprintf(stderr, "Failed to write PNG image.\n");
exit(EXIT_FAILURE);
}
palette = (png_colorp) malloc(sizeof(png_color) * 2);
if(palette == NULL) {
fprintf(stderr, "Failed to allocate memory.\n");
exit(EXIT_FAILURE);
}
palette[0].red = fg_color[0];
palette[0].green = fg_color[1];
palette[0].blue = fg_color[2];
palette[1].red = bg_color[0];
palette[1].green = bg_color[1];
palette[1].blue = bg_color[2];
alpha_values[0] = fg_color[3];
alpha_values[1] = bg_color[3];
png_set_PLTE(png_ptr, info_ptr, palette, 2);
png_set_tRNS(png_ptr, info_ptr, alpha_values, 2, NULL);
png_init_io(png_ptr, fp);
png_set_IHDR(png_ptr, info_ptr,
realwidth, realwidth,
1,
PNG_COLOR_TYPE_PALETTE,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_set_pHYs(png_ptr, info_ptr,
dpi * INCHES_PER_METER,
dpi * INCHES_PER_METER,
PNG_RESOLUTION_METER);
png_write_info(png_ptr, info_ptr);
/* top margin */
memset(row, 0xff, (realwidth + 7) / 8);
for(y=0; y<margin * size; y++) {
png_write_row(png_ptr, row);
}
/* data */
p = qrcode->data;
for(y=0; y<qrcode->width; y++) {
bit = 7;
memset(row, 0xff, (realwidth + 7) / 8);
q = row;
q += margin * size / 8;
bit = 7 - (margin * size % 8);
for(x=0; x<qrcode->width; x++) {
for(xx=0; xx<size; xx++) {
*q ^= (*p & 1) << bit;
bit--;
if(bit < 0) {
q++;
bit = 7;
}
}
p++;
}
for(yy=0; yy<size; yy++) {
png_write_row(png_ptr, row);
}
}
/* bottom margin */
memset(row, 0xff, (realwidth + 7) / 8);
for(y=0; y<margin * size; y++) {
png_write_row(png_ptr, row);
}
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
free(row);
free(palette);
return 0;
}
static BOOL DLL_CALLCONV
Save(FreeImageIO *io, FIBITMAP *dib, fi_handle handle, int page, int flags, void *data) {
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette = NULL;
png_uint_32 width, height;
BOOL has_alpha_channel = FALSE;
RGBQUAD *pal; // pointer to dib palette
int bit_depth, pixel_depth; // pixel_depth = bit_depth * channels
int palette_entries;
int interlace_type;
fi_ioStructure fio;
fio.s_handle = handle;
fio.s_io = io;
if ((dib) && (handle)) {
try {
// create the chunk manage structure
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, error_handler, warning_handler);
if (!png_ptr) {
return FALSE;
}
// allocate/initialize the image information data.
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
return FALSE;
}
// Set error handling. REQUIRED if you aren't supplying your own
// error handling functions in the png_create_write_struct() call.
if (setjmp(png_jmpbuf(png_ptr))) {
// if we get here, we had a problem reading the file
png_destroy_write_struct(&png_ptr, &info_ptr);
return FALSE;
}
// init the IO
png_set_write_fn(png_ptr, &fio, _WriteProc, _FlushProc);
// set physical resolution
png_uint_32 res_x = (png_uint_32)FreeImage_GetDotsPerMeterX(dib);
png_uint_32 res_y = (png_uint_32)FreeImage_GetDotsPerMeterY(dib);
if ((res_x > 0) && (res_y > 0)) {
png_set_pHYs(png_ptr, info_ptr, res_x, res_y, PNG_RESOLUTION_METER);
}
// Set the image information here. Width and height are up to 2^31,
// bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
// the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
// PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
// or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or
// PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
// currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
width = FreeImage_GetWidth(dib);
height = FreeImage_GetHeight(dib);
pixel_depth = FreeImage_GetBPP(dib);
BOOL bInterlaced = FALSE;
if( (flags & PNG_INTERLACED) == PNG_INTERLACED) {
interlace_type = PNG_INTERLACE_ADAM7;
bInterlaced = TRUE;
} else {
interlace_type = PNG_INTERLACE_NONE;
}
// set the ZLIB compression level or default to PNG default compression level (ZLIB level = 6)
int zlib_level = flags & 0x0F;
if((zlib_level >= 1) && (zlib_level <= 9)) {
png_set_compression_level(png_ptr, zlib_level);
} else if((flags & PNG_Z_NO_COMPRESSION) == PNG_Z_NO_COMPRESSION) {
png_set_compression_level(png_ptr, Z_NO_COMPRESSION);
}
// filtered strategy works better for high color images
if(pixel_depth >= 16){
png_set_compression_strategy(png_ptr, Z_FILTERED);
png_set_filter(png_ptr, 0, PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_PAETH);
} else {
png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
}
FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(dib);
if(image_type == FIT_BITMAP) {
// standard image type
bit_depth = (pixel_depth > 8) ? 8 : pixel_depth;
} else {
// 16-bit greyscale or 16-bit RGB(A)
bit_depth = 16;
}
switch (FreeImage_GetColorType(dib)) {
case FIC_MINISWHITE:
// Invert monochrome files to have 0 as black and 1 as white (no break here)
png_set_invert_mono(png_ptr);
case FIC_MINISBLACK:
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
PNG_COLOR_TYPE_GRAY, interlace_type,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
break;
case FIC_PALETTE:
{
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
PNG_COLOR_TYPE_PALETTE, interlace_type,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
// set the palette
palette_entries = 1 << bit_depth;
palette = (png_colorp)png_malloc(png_ptr, palette_entries * sizeof (png_color));
pal = FreeImage_GetPalette(dib);
for (int i = 0; i < palette_entries; i++) {
palette[i].red = pal[i].rgbRed;
palette[i].green = pal[i].rgbGreen;
palette[i].blue = pal[i].rgbBlue;
}
png_set_PLTE(png_ptr, info_ptr, palette, palette_entries);
// You must not free palette here, because png_set_PLTE only makes a link to
// the palette that you malloced. Wait until you are about to destroy
// the png structure.
break;
}
case FIC_RGBALPHA :
has_alpha_channel = TRUE;
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
PNG_COLOR_TYPE_RGBA, interlace_type,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
// flip BGR pixels to RGB
if(image_type == FIT_BITMAP) {
png_set_bgr(png_ptr);
}
#endif
break;
case FIC_RGB:
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
PNG_COLOR_TYPE_RGB, interlace_type,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
// flip BGR pixels to RGB
if(image_type == FIT_BITMAP) {
png_set_bgr(png_ptr);
}
#endif
break;
case FIC_CMYK:
break;
}
// write possible ICC profile
FIICCPROFILE *iccProfile = FreeImage_GetICCProfile(dib);
if (iccProfile->size && iccProfile->data) {
png_set_iCCP(png_ptr, info_ptr, "Embedded Profile", 0, (png_const_bytep)iccProfile->data, iccProfile->size);
}
// write metadata
WriteMetadata(png_ptr, info_ptr, dib);
// Optional gamma chunk is strongly suggested if you have any guess
// as to the correct gamma of the image.
// png_set_gAMA(png_ptr, info_ptr, gamma);
// set the transparency table
if (FreeImage_IsTransparent(dib) && (FreeImage_GetTransparencyCount(dib) > 0)) {
png_set_tRNS(png_ptr, info_ptr, FreeImage_GetTransparencyTable(dib), FreeImage_GetTransparencyCount(dib), NULL);
}
// set the background color
if(FreeImage_HasBackgroundColor(dib)) {
png_color_16 image_background;
RGBQUAD rgbBkColor;
FreeImage_GetBackgroundColor(dib, &rgbBkColor);
memset(&image_background, 0, sizeof(png_color_16));
image_background.blue = rgbBkColor.rgbBlue;
image_background.green = rgbBkColor.rgbGreen;
image_background.red = rgbBkColor.rgbRed;
image_background.index = rgbBkColor.rgbReserved;
png_set_bKGD(png_ptr, info_ptr, &image_background);
}
// Write the file header information.
png_write_info(png_ptr, info_ptr);
// write out the image data
#ifndef FREEIMAGE_BIGENDIAN
if (bit_depth == 16) {
// turn on 16 bit byte swapping
png_set_swap(png_ptr);
}
#endif
int number_passes = 1;
if (bInterlaced) {
number_passes = png_set_interlace_handling(png_ptr);
}
if ((pixel_depth == 32) && (!has_alpha_channel)) {
BYTE *buffer = (BYTE *)malloc(width * 3);
// transparent conversion to 24-bit
// the number of passes is either 1 for non-interlaced images, or 7 for interlaced images
for (int pass = 0; pass < number_passes; pass++) {
for (png_uint_32 k = 0; k < height; k++) {
FreeImage_ConvertLine32To24(buffer, FreeImage_GetScanLine(dib, height - k - 1), width);
png_write_row(png_ptr, buffer);
}
}
free(buffer);
} else {
// the number of passes is either 1 for non-interlaced images, or 7 for interlaced images
for (int pass = 0; pass < number_passes; pass++) {
for (png_uint_32 k = 0; k < height; k++) {
png_write_row(png_ptr, FreeImage_GetScanLine(dib, height - k - 1));
}
}
}
// It is REQUIRED to call this to finish writing the rest of the file
// Bug with png_flush
png_write_end(png_ptr, info_ptr);
// clean up after the write, and free any memory allocated
if (palette) {
png_free(png_ptr, palette);
}
png_destroy_write_struct(&png_ptr, &info_ptr);
return TRUE;
} catch (const char *text) {
FreeImage_OutputMessageProc(s_format_id, text);
}
}
return FALSE;
}
/*
* Reduce the image type from grayscale(+alpha) or RGB(+alpha) to palette,
* if possible.
* The parameter reductions indicates the intended reductions.
* The function returns the successful reductions.
*/
png_uint_32 /* PRIVATE */
opng_reduce_to_palette(png_structp png_ptr, png_infop info_ptr,
png_uint_32 reductions)
{
png_uint_32 result;
png_bytepp row_ptr;
png_bytep sample_ptr, alpha_row;
png_uint_32 height, width, channels, i, j;
unsigned int color_type, dest_bit_depth;
png_color palette[256];
png_byte trans_alpha[256];
int num_palette, num_trans, index;
png_color_16p background;
unsigned int gray, red, green, blue, alpha;
unsigned int prev_gray, prev_red, prev_green, prev_blue, prev_alpha;
opng_debug(1, "in opng_reduce_to_palette");
if (info_ptr->bit_depth != 8)
return OPNG_REDUCE_NONE; /* nothing is done in this case */
color_type = info_ptr->color_type;
OPNG_ASSERT(!(info_ptr->color_type & PNG_COLOR_MASK_PALETTE));
row_ptr = info_ptr->row_pointers;
height = info_ptr->height;
width = info_ptr->width;
channels = info_ptr->channels;
alpha_row = (png_bytep)png_malloc(png_ptr, width);
/* Analyze the possibility of this reduction. */
num_palette = num_trans = 0;
prev_gray = prev_red = prev_green = prev_blue = prev_alpha = 256;
for (i = 0; i < height; ++i, ++row_ptr)
{
sample_ptr = *row_ptr;
opng_get_alpha_row(png_ptr, info_ptr, *row_ptr, alpha_row);
if (color_type & PNG_COLOR_MASK_COLOR)
{
for (j = 0; j < width; ++j, sample_ptr += channels)
{
red = sample_ptr[0];
green = sample_ptr[1];
blue = sample_ptr[2];
alpha = alpha_row[j];
/* Check the cache first. */
if (red != prev_red || green != prev_green || blue != prev_blue ||
alpha != prev_alpha)
{
prev_red = red;
prev_green = green;
prev_blue = blue;
prev_alpha = alpha;
if (opng_insert_palette_entry(palette, &num_palette,
trans_alpha, &num_trans, 256,
red, green, blue, alpha, &index) < 0) /* overflow */
{
OPNG_ASSERT(num_palette < 0);
i = height; /* forced exit from outer loop */
break;
}
}
}
}
else /* grayscale */
{
for (j = 0; j < width; ++j, sample_ptr += channels)
{
gray = sample_ptr[0];
alpha = alpha_row[j];
/* Check the cache first. */
if (gray != prev_gray || alpha != prev_alpha)
{
prev_gray = gray;
prev_alpha = alpha;
if (opng_insert_palette_entry(palette, &num_palette,
trans_alpha, &num_trans, 256,
gray, gray, gray, alpha, &index) < 0) /* overflow */
{
OPNG_ASSERT(num_palette < 0);
i = height; /* forced exit from outer loop */
break;
}
}
}
}
}
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
if ((num_palette >= 0) && (info_ptr->valid & PNG_INFO_bKGD))
{
/* bKGD has an alpha-agnostic palette entry. */
background = &info_ptr->background;
if (color_type & PNG_COLOR_MASK_COLOR)
{
red = background->red;
green = background->green;
blue = background->blue;
}
else
red = green = blue = background->gray;
opng_insert_palette_entry(palette, &num_palette,
trans_alpha, &num_trans, 256,
red, green, blue, 256, &index);
if (index >= 0)
background->index = (png_byte)index;
}
#endif
/* Continue only if the uncompressed indexed image (pixels + PLTE + tRNS)
* is smaller than the uncompressed RGB(A) image.
* Casual overhead (headers, CRCs, etc.) is ignored.
*
* Compare:
* num_pixels * (src_bit_depth * channels - dest_bit_depth) / 8
* vs.
* sizeof(PLTE) + sizeof(tRNS)
*/
if (num_palette >= 0)
{
OPNG_ASSERT(num_palette > 0 && num_palette <= 256);
OPNG_ASSERT(num_trans >= 0 && num_trans <= num_palette);
if (num_palette <= 2)
dest_bit_depth = 1;
else if (num_palette <= 4)
dest_bit_depth = 2;
else if (num_palette <= 16)
dest_bit_depth = 4;
else
dest_bit_depth = 8;
/* Do the comparison in a way that does not cause overflow. */
if (channels * 8 == dest_bit_depth ||
(3 * num_palette + num_trans) * 8 / (channels * 8 - dest_bit_depth)
/ width / height >= 1)
num_palette = -1;
}
if (num_palette < 0) /* can't reduce */
{
png_free(png_ptr, alpha_row);
return OPNG_REDUCE_NONE;
}
/* Reduce. */
row_ptr = info_ptr->row_pointers;
index = -1;
prev_red = prev_green = prev_blue = prev_alpha = (unsigned int)(-1);
for (i = 0; i < height; ++i, ++row_ptr)
{
sample_ptr = *row_ptr;
opng_get_alpha_row(png_ptr, info_ptr, *row_ptr, alpha_row);
if (color_type & PNG_COLOR_MASK_COLOR)
{
for (j = 0; j < width; ++j, sample_ptr += channels)
{
red = sample_ptr[0];
green = sample_ptr[1];
blue = sample_ptr[2];
alpha = alpha_row[j];
/* Check the cache first. */
if (red != prev_red || green != prev_green || blue != prev_blue ||
alpha != prev_alpha)
{
prev_red = red;
prev_green = green;
prev_blue = blue;
prev_alpha = alpha;
if (opng_insert_palette_entry(palette, &num_palette,
trans_alpha, &num_trans, 256,
red, green, blue, alpha, &index) != 0)
index = -1; /* this should not happen */
}
OPNG_ASSERT(index >= 0);
(*row_ptr)[j] = (png_byte)index;
}
}
else /* grayscale */
{
for (j = 0; j < width; ++j, sample_ptr += channels)
{
gray = sample_ptr[0];
alpha = alpha_row[j];
/* Check the cache first. */
if (gray != prev_gray || alpha != prev_alpha)
{
prev_gray = gray;
prev_alpha = alpha;
if (opng_insert_palette_entry(palette, &num_palette,
trans_alpha, &num_trans, 256,
gray, gray, gray, alpha, &index) != 0)
index = -1; /* this should not happen */
}
OPNG_ASSERT(index >= 0);
(*row_ptr)[j] = (png_byte)index;
}
}
}
/* Update the image info. */
png_ptr->rowbytes = info_ptr->rowbytes = 0;
png_ptr->color_type = info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
png_ptr->channels = info_ptr->channels = 1;
png_ptr->pixel_depth = info_ptr->pixel_depth = 8;
png_set_PLTE(png_ptr, info_ptr, palette, num_palette);
if (num_trans > 0)
png_set_tRNS(png_ptr, info_ptr, trans_alpha, num_trans, NULL);
/* bKGD (if present) is already updated. */
png_free(png_ptr, alpha_row);
result = OPNG_REDUCE_RGB_TO_PALETTE;
if (reductions & OPNG_REDUCE_8_TO_4_2_1)
result |= opng_reduce_palette_bits(png_ptr, info_ptr, reductions);
return result;
}
/*!
* pixWriteStreamPng()
*
* Input: stream
* pix
* gamma (use 0.0 if gamma is not defined)
* Return: 0 if OK; 1 on error
*
* Notes:
* (1) If called from pixWriteStream(), the stream is positioned
* at the beginning of the file.
* (2) To do sequential writes of png format images to a stream,
* use pixWriteStreamPng() directly.
* (3) gamma is an optional png chunk. If no gamma value is to be
* placed into the file, use gamma = 0.0. Otherwise, if
* gamma > 0.0, its value is written into the header.
* (4) The use of gamma in png is highly problematic. For an illuminating
* discussion, see: http://hsivonen.iki.fi/png-gamma/
* (5) What is the effect/meaning of gamma in the png file? This
* gamma, which we can call the 'source' gamma, is the
* inverse of the gamma that was used in enhance.c to brighten
* or darken images. The 'source' gamma is supposed to indicate
* the intensity mapping that was done at the time the
* image was captured. Display programs typically apply a
* 'display' gamma of 2.2 to the output, which is intended
* to linearize the intensity based on the response of
* thermionic tubes (CRTs). Flat panel LCDs have typically
* been designed to give a similar response as CRTs (call it
* "backward compatibility"). The 'display' gamma is
* in some sense the inverse of the 'source' gamma.
* jpeg encoders attached to scanners and cameras will lighten
* the pixels, applying a gamma corresponding to approximately
* a square-root relation of output vs input:
* output = input^(gamma)
* where gamma is often set near 0.4545 (1/gamma is 2.2).
* This is stored in the image file. Then if the display
* program reads the gamma, it will apply a display gamma,
* typically about 2.2; the product is 1.0, and the
* display program produces a linear output. This works because
* the dark colors were appropriately boosted by the scanner,
* as described by the 'source' gamma, so they should not
* be further boosted by the display program.
* (6) As an example, with xv and display, if no gamma is stored,
* the program acts as if gamma were 0.4545, multiplies this by 2.2,
* and does a linear rendering. Taking this as a baseline
* brightness, if the stored gamma is:
* > 0.4545, the image is rendered lighter than baseline
* < 0.4545, the image is rendered darker than baseline
* In contrast, gqview seems to ignore the gamma chunk in png.
* (7) The only valid pixel depths in leptonica are 1, 2, 4, 8, 16
* and 32. However, it is possible, and in some cases desirable,
* to write out a png file using an rgb pix that has 24 bpp.
* For example, the open source xpdf SplashBitmap class generates
* 24 bpp rgb images. Consequently, we anble writing 24 bpp pix.
* To generate such a pix, you can make a 24 bpp pix without data
* and assign the data array to the pix; e.g.,
* pix = pixCreateHeader(w, h, 24);
* pixSetData(pix, rgbdata);
* See pixConvert32To24() for an example, where we get rgbdata
* from the 32 bpp pix. Caution: do not call pixSetPadBits(),
* because the alignment is wrong and you may erase part of the
* last pixel on each line.
*/
l_int32
pixWriteStreamPng(FILE *fp,
PIX *pix,
l_float32 gamma)
{
char commentstring[] = "Comment";
l_int32 i, j, k;
l_int32 wpl, d, cmflag;
l_int32 ncolors;
l_int32 *rmap, *gmap, *bmap;
l_uint32 *data, *ppixel;
png_byte bit_depth, color_type;
png_uint_32 w, h;
png_uint_32 xres, yres;
png_bytep *row_pointers;
png_bytep rowbuffer;
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette;
PIX *pixt;
PIXCMAP *cmap;
char *text;
PROCNAME("pixWriteStreamPng");
if (!fp)
return ERROR_INT("stream not open", procName, 1);
if (!pix)
return ERROR_INT("pix not defined", procName, 1);
/* Allocate the 2 data structures */
if ((png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
(png_voidp)NULL, NULL, NULL)) == NULL)
return ERROR_INT("png_ptr not made", procName, 1);
if ((info_ptr = png_create_info_struct(png_ptr)) == NULL) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
return ERROR_INT("info_ptr not made", procName, 1);
}
/* Set up png setjmp error handling */
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return ERROR_INT("internal png error", procName, 1);
}
png_init_io(png_ptr, fp);
/* With best zlib compression (9), get between 1 and 10% improvement
* over default (5), but the compression is 3 to 10 times slower.
* Our default compression is the zlib default (5). */
png_set_compression_level(png_ptr, var_ZLIB_COMPRESSION);
w = pixGetWidth(pix);
h = pixGetHeight(pix);
d = pixGetDepth(pix);
if ((cmap = pixGetColormap(pix)))
cmflag = 1;
else
cmflag = 0;
/* Set the color type and bit depth. */
if (d == 32 && var_PNG_WRITE_ALPHA == 1) {
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGBA; /* 6 */
cmflag = 0; /* ignore if it exists */
}
else if (d == 24 || d == 32) {
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB; /* 2 */
cmflag = 0; /* ignore if it exists */
}
else {
bit_depth = d;
color_type = PNG_COLOR_TYPE_GRAY; /* 0 */
}
if (cmflag)
color_type = PNG_COLOR_TYPE_PALETTE; /* 3 */
#if DEBUG
fprintf(stderr, "cmflag = %d, bit_depth = %d, color_type = %d\n",
cmflag, bit_depth, color_type);
#endif /* DEBUG */
png_set_IHDR(png_ptr, info_ptr, w, h, bit_depth, color_type,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
/* Store resolution in ppm, if known */
xres = (png_uint_32)(39.37 * (l_float32)pixGetXRes(pix) + 0.5);
yres = (png_uint_32)(39.37 * (l_float32)pixGetYRes(pix) + 0.5);
if ((xres == 0) || (yres == 0))
png_set_pHYs(png_ptr, info_ptr, 0, 0, PNG_RESOLUTION_UNKNOWN);
else
png_set_pHYs(png_ptr, info_ptr, xres, yres, PNG_RESOLUTION_METER);
if (cmflag) {
pixcmapToArrays(cmap, &rmap, &gmap, &bmap);
ncolors = pixcmapGetCount(cmap);
/* Make and save the palette */
if ((palette = (png_colorp)(CALLOC(ncolors, sizeof(png_color))))
== NULL)
return ERROR_INT("palette not made", procName, 1);
for (i = 0; i < ncolors; i++) {
palette[i].red = (png_byte)rmap[i];
palette[i].green = (png_byte)gmap[i];
palette[i].blue = (png_byte)bmap[i];
}
png_set_PLTE(png_ptr, info_ptr, palette, (int)ncolors);
FREE(rmap);
FREE(gmap);
FREE(bmap);
}
/* 0.4545 is treated as the default by some image
* display programs (not gqview). A value > 0.4545 will
* lighten an image as displayed by xv, display, etc. */
if (gamma > 0.0)
png_set_gAMA(png_ptr, info_ptr, (l_float64)gamma);
if ((text = pixGetText(pix))) {
png_text text_chunk;
text_chunk.compression = PNG_TEXT_COMPRESSION_NONE;
text_chunk.key = commentstring;
text_chunk.text = text;
text_chunk.text_length = strlen(text);
#ifdef PNG_ITXT_SUPPORTED
text_chunk.itxt_length = 0;
text_chunk.lang = NULL;
text_chunk.lang_key = NULL;
#endif
png_set_text(png_ptr, info_ptr, &text_chunk, 1);
}
/* Write header and palette info */
png_write_info(png_ptr, info_ptr);
if ((d != 32) && (d != 24)) { /* not rgb color */
/* Generate a temporary pix with bytes swapped.
* For a binary image, there are two conditions in
* which you must first invert the data for writing png:
* (a) no colormap
* (b) colormap with BLACK set to 0
* png writes binary with BLACK = 0, unless contradicted
* by a colormap. If the colormap has BLACK = "1"
* (typ. about 255), do not invert the data. If there
* is no colormap, you must invert the data to store
* in default BLACK = 0 state. */
if (d == 1 &&
(!cmap || (cmap && ((l_uint8 *)(cmap->array))[0] == 0x0))) {
pixt = pixInvert(NULL, pix);
pixEndianByteSwap(pixt);
}
else
pixt = pixEndianByteSwapNew(pix);
if (!pixt) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return ERROR_INT("pixt not made", procName, 1);
}
/* Make and assign array of image row pointers */
if ((row_pointers = (png_bytep *)CALLOC(h, sizeof(png_bytep))) == NULL)
return ERROR_INT("row-pointers not made", procName, 1);
wpl = pixGetWpl(pixt);
data = pixGetData(pixt);
for (i = 0; i < h; i++)
row_pointers[i] = (png_bytep)(data + i * wpl);
png_set_rows(png_ptr, info_ptr, row_pointers);
/* Transfer the data */
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
if (cmflag)
FREE(palette);
FREE(row_pointers);
pixDestroy(&pixt);
png_destroy_write_struct(&png_ptr, &info_ptr);
return 0;
}
/* For rgb, compose and write a row at a time */
data = pixGetData(pix);
wpl = pixGetWpl(pix);
if (d == 24) { /* See note 7 above: special case of 24 bpp rgb */
for (i = 0; i < h; i++) {
ppixel = data + i * wpl;
png_write_rows(png_ptr, (png_bytepp)&ppixel, 1);
}
}
else { /* 32 bpp rgb and rgba */
if ((rowbuffer = (png_bytep)CALLOC(w, 4)) == NULL)
return ERROR_INT("rowbuffer not made", procName, 1);
for (i = 0; i < h; i++) {
ppixel = data + i * wpl;
for (j = k = 0; j < w; j++) {
rowbuffer[k++] = GET_DATA_BYTE(ppixel, COLOR_RED);
rowbuffer[k++] = GET_DATA_BYTE(ppixel, COLOR_GREEN);
rowbuffer[k++] = GET_DATA_BYTE(ppixel, COLOR_BLUE);
if (var_PNG_WRITE_ALPHA == 1)
rowbuffer[k++] = GET_DATA_BYTE(ppixel, L_ALPHA_CHANNEL);
ppixel++;
}
png_write_rows(png_ptr, &rowbuffer, 1);
}
FREE(rowbuffer);
}
png_write_end(png_ptr, info_ptr);
if (cmflag)
FREE(palette);
png_destroy_write_struct(&png_ptr, &info_ptr);
return 0;
}
void write_png (std::string filename)
{
FILE* fp;
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette;
//png_uint_32 bytes_per_pixel = 1;
fp = fopen(filename.c_str (), "wb");
if (fp == NULL)
assert (false);
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info_ptr = png_create_info_struct(png_ptr);
png_init_io(png_ptr, fp);
png_set_IHDR(png_ptr, info_ptr, m_width, m_height, 8 /* bitdepth */,
PNG_COLOR_TYPE_PALETTE,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
* sizeof (png_color));
std::cout << "MAX: " << PNG_MAX_PALETTE_LENGTH << std::endl;
for (unsigned int i = 0; i < m_palette.size(); ++i)
{
palette[i].red = m_palette[i].red;
palette[i].green = m_palette[i].green;
palette[i].blue = m_palette[i].blue;
}
/** insert palette converter here */
png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
png_write_info(png_ptr, info_ptr);
png_uint_32 height = m_height, width = m_width;
png_byte image[height * width /* *bytes_per_pixel */];
png_bytep row_pointers[height];
// fill the image with data
for (unsigned int i = 0; i < m_image.size (); ++i)
{
image[i] = m_image[i];
}
for (unsigned int k = 0; k < height; k++)
row_pointers[k] = image + k * width /* * bytes_per_pixel*/;
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
png_free(png_ptr, palette);
//png_free(png_ptr, trans);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
}
/* Saves an SDL surface to a png file.
* TODO: support screen formats.
*/
int sdl_surface_savepng(SDL_Surface * surf, const char * filename) {
png_bytep * rows = NULL;
png_colorp pale = NULL;
FILE * fout = NULL;
png_structp png = NULL;
png_infop info = NULL;
int colortype;
int i = 0;
Uint8 * tran = NULL;
SDL_PixelFormat * fmt = NULL;
SDL_Surface * temp = NULL;
if (!surf) { return save_fail("Surface was NULL."); }
if (!filename) { return save_fail("Filename was NULL."); }
rows = gymalloc(sizeof(png_bytep)*surf->h);
if (!rows) { return save_fail("Out of memory."); }
for (i = 0; i < surf->h; i++) {
rows[i] = ((Uint8 *)surf->pixels) + i*surf->pitch;
}
/* Create palette and transparency table if needed. */
fmt = surf->format;
if (fmt->palette) {
pale = malloc(fmt->palette->ncolors * sizeof(png_color));
if (!pale) {
savepng_done(rows, fout, png, info, temp, pale, tran);
return save_fail("Out of memory in saving palette.");
}
for (i = 0; i < fmt->palette->ncolors; i++) {
pale[i].red = fmt->palette->colors[i].r;
pale[i].green = fmt->palette->colors[i].g;
pale[i].blue = fmt->palette->colors[i].b;
}
if (surf->flags & SDL_SRCCOLORKEY) {
tran = malloc(fmt->palette->ncolors * sizeof(Uint8));
if(!tran) {
savepng_done(rows, fout, png, info, temp, pale, tran);
return save_fail("Out of memory in saving palette transparency.");
}
for (i = 0; i < fmt->palette->ncolors; i++) {
tran[i] = (((unsigned)i) == fmt->colorkey) ? 255 : 0;
}
}
}
fout = fopen(filename, "wb");
if(!fout) {
savepng_done(rows, fout, png, info, temp, pale, tran);
return save_fail("Couldn't open file for writing.");
}
png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png) {
savepng_done(rows, fout, png, info, temp, pale, tran);
return save_fail("Couldn't create png_structp");
}
info = png_create_info_struct(png);
if (!info) {
savepng_done(rows, fout, png, info, temp, pale, tran);
return save_fail("Couldn't create png_infop");
}
/* libpng rudely uses longjump to terminate on errors.
This in turns causes warning of pissbli clobered variables. Could it suck
more? */
if (setjmp(png->jmpbuf)) {
/* This give a warning, but it seems to be unavoidable. */
savepng_done(rows, fout, png, info, temp, pale, tran);
return save_fail("Error writing png file.");
}
/* Set file pointer. */
png_init_io(png, fout);
colortype = sdl_surface_pngcolortype(surf);
png_set_IHDR(png, info, surf->w, surf->h, 8, colortype, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
/* Write palette if needed. */
if(pale) {
png_set_PLTE(png, info, pale, fmt->palette->ncolors);
}
/* Write transparency table if needed. */
if (tran) {
png_set_tRNS(png, info, tran, fmt->palette->ncolors, NULL);
}
/* Write the image. */
png_write_info(png, info);
png_set_packing(png);
if(SDL_MUSTLOCK(surf)) { SDL_LockSurface(surf); }
png_write_image(png, rows);
if(SDL_MUSTLOCK(surf)) { SDL_UnlockSurface(surf); }
png_write_end(png, info);
/* Clean up. */
savepng_done(rows, fout, png, info, temp, pale, tran);
return 0;
}
void write_header( const View& view )
{
using png_rw_info_t = detail::png_write_support
<
typename channel_type<typename get_pixel_type<View>::type>::type,
typename color_space_type<View>::type
>;
// Set the image information here. Width and height are up to 2^31,
// bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
// the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
// PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
// or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or
// PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
// currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
png_set_IHDR( get_struct()
, get_info()
, static_cast< png_image_width::type >( view.width() )
, static_cast< png_image_height::type >( view.height() )
, static_cast< png_bitdepth::type >( png_rw_info_t::_bit_depth )
, static_cast< png_color_type::type >( png_rw_info_t::_color_type )
, _info._interlace_method
, _info._compression_type
, _info._filter_method
);
#ifdef BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED
if( _info._valid_cie_colors )
{
png_set_cHRM( get_struct()
, get_info()
, _info._white_x
, _info._white_y
, _info._red_x
, _info._red_y
, _info._green_x
, _info._green_y
, _info._blue_x
, _info._blue_y
);
}
if( _info._valid_file_gamma )
{
png_set_gAMA( get_struct()
, get_info()
, _info._file_gamma
);
}
#else
if( _info._valid_cie_colors )
{
png_set_cHRM_fixed( get_struct()
, get_info()
, _info._white_x
, _info._white_y
, _info._red_x
, _info._red_y
, _info._green_x
, _info._green_y
, _info._blue_x
, _info._blue_y
);
}
if( _info._valid_file_gamma )
{
png_set_gAMA_fixed( get_struct()
, get_info()
, _info._file_gamma
);
}
#endif // BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED
if( _info._valid_icc_profile )
{
#if PNG_LIBPNG_VER_MINOR >= 5
png_set_iCCP( get_struct()
, get_info()
, const_cast< png_charp >( _info._icc_name.c_str() )
, _info._iccp_compression_type
, reinterpret_cast< png_const_bytep >( & (_info._profile.front ()) )
, _info._profile_length
);
#else
png_set_iCCP( get_struct()
, get_info()
, const_cast< png_charp >( _info._icc_name.c_str() )
, _info._iccp_compression_type
, const_cast< png_charp >( & (_info._profile.front()) )
, _info._profile_length
);
#endif
}
if( _info._valid_intent )
{
png_set_sRGB( get_struct()
, get_info()
, _info._intent
);
}
if( _info._valid_palette )
{
png_set_PLTE( get_struct()
, get_info()
, const_cast< png_colorp >( &_info._palette.front() )
, _info._num_palette
);
}
if( _info._valid_background )
{
png_set_bKGD( get_struct()
, get_info()
, const_cast< png_color_16p >( &_info._background )
);
}
if( _info._valid_histogram )
{
png_set_hIST( get_struct()
, get_info()
, const_cast< png_uint_16p >( &_info._histogram.front() )
);
}
if( _info._valid_offset )
{
png_set_oFFs( get_struct()
, get_info()
, _info._offset_x
, _info._offset_y
, _info._off_unit_type
);
}
if( _info._valid_pixel_calibration )
{
std::vector< const char* > params( _info._num_params );
for( std::size_t i = 0; i < params.size(); ++i )
{
params[i] = _info._params[ i ].c_str();
}
png_set_pCAL( get_struct()
, get_info()
, const_cast< png_charp >( _info._purpose.c_str() )
, _info._X0
, _info._X1
, _info._cal_type
, _info._num_params
, const_cast< png_charp >( _info._units.c_str() )
, const_cast< png_charpp >( ¶ms.front() )
);
}
if( _info._valid_resolution )
{
png_set_pHYs( get_struct()
, get_info()
, _info._res_x
, _info._res_y
, _info._phy_unit_type
);
}
if( _info._valid_significant_bits )
{
png_set_sBIT( get_struct()
, get_info()
, const_cast< png_color_8p >( &_info._sig_bits )
);
}
#ifndef BOOST_GIL_IO_PNG_1_4_OR_LOWER
#ifdef BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED
if( _info._valid_scale_factors )
{
png_set_sCAL( get_struct()
, get_info()
, this->_info._scale_unit
, this->_info._scale_width
, this->_info._scale_height
);
}
#else
#ifdef BOOST_GIL_IO_PNG_FIXED_POINT_SUPPORTED
if( _info._valid_scale_factors )
{
png_set_sCAL_fixed( get_struct()
, get_info()
, this->_info._scale_unit
, this->_info._scale_width
, this->_info._scale_height
);
}
#else
if( _info._valid_scale_factors )
{
png_set_sCAL_s( get_struct()
, get_info()
, this->_info._scale_unit
, const_cast< png_charp >( this->_info._scale_width.c_str() )
, const_cast< png_charp >( this->_info._scale_height.c_str() )
);
}
#endif // BOOST_GIL_IO_PNG_FIXED_POINT_SUPPORTED
#endif // BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED
#endif // BOOST_GIL_IO_PNG_1_4_OR_LOWER
if( _info._valid_text )
{
std::vector< png_text > texts( _info._num_text );
for( std::size_t i = 0; i < texts.size(); ++i )
{
png_text pt;
pt.compression = _info._text[i]._compression;
pt.key = const_cast< png_charp >( this->_info._text[i]._key.c_str() );
pt.text = const_cast< png_charp >( this->_info._text[i]._text.c_str() );
pt.text_length = _info._text[i]._text.length();
texts[i] = pt;
}
png_set_text( get_struct()
, get_info()
, &texts.front()
, _info._num_text
);
}
if( _info._valid_modification_time )
{
png_set_tIME( get_struct()
, get_info()
, const_cast< png_timep >( &_info._mod_time )
);
}
if( _info._valid_transparency_factors )
{
int sample_max = ( 1u << _info._bit_depth );
/* libpng doesn't reject a tRNS chunk with out-of-range samples */
if( !( ( _info._color_type == PNG_COLOR_TYPE_GRAY
&& (int) _info._trans_values[0].gray > sample_max
)
|| ( _info._color_type == PNG_COLOR_TYPE_RGB
&&( (int) _info._trans_values[0].red > sample_max
|| (int) _info._trans_values[0].green > sample_max
|| (int) _info._trans_values[0].blue > sample_max
)
)
)
)
{
//@todo Fix that once reading transparency values works
/*
png_set_tRNS( get_struct()
, get_info()
, trans
, num_trans
, trans_values
);
*/
}
}
// Compression Levels - valid values are [0,9]
png_set_compression_level( get_struct()
, _info._compression_level
);
png_set_compression_mem_level( get_struct()
, _info._compression_mem_level
);
png_set_compression_strategy( get_struct()
, _info._compression_strategy
);
png_set_compression_window_bits( get_struct()
, _info._compression_window_bits
);
png_set_compression_method( get_struct()
, _info._compression_method
);
png_set_compression_buffer_size( get_struct()
, _info._compression_buffer_size
);
#ifdef BOOST_GIL_IO_PNG_DITHERING_SUPPORTED
// Dithering
if( _info._set_dithering )
{
png_set_dither( get_struct()
, &_info._dithering_palette.front()
, _info._dithering_num_palette
, _info._dithering_maximum_colors
, &_info._dithering_histogram.front()
, _info._full_dither
);
}
#endif // BOOST_GIL_IO_PNG_DITHERING_SUPPORTED
// Filter
if( _info._set_filter )
{
png_set_filter( get_struct()
, 0
, _info._filter
);
}
// Invert Mono
if( _info._invert_mono )
{
png_set_invert_mono( get_struct() );
}
// True Bits
if( _info._set_true_bits )
{
png_set_sBIT( get_struct()
, get_info()
, &_info._true_bits.front()
);
}
// sRGB Intent
if( _info._set_srgb_intent )
{
png_set_sRGB( get_struct()
, get_info()
, _info._srgb_intent
);
}
// Strip Alpha
if( _info._strip_alpha )
{
png_set_strip_alpha( get_struct() );
}
// Swap Alpha
if( _info._swap_alpha )
{
png_set_swap_alpha( get_struct() );
}
png_write_info( get_struct()
, get_info()
);
}
