BOOL DLL_CALLCONV
FreeImage_JPEGCrop(const char *src_file, const char *dst_file, int left, int top, int right, int bottom) {
char crop[64];
try {
// check the src file format
if(FreeImage_GetFileType(src_file) != FIF_JPEG) {
throw FI_MSG_ERROR_MAGIC_NUMBER;
}
// normalize the rectangle
if(right < left) {
INPLACESWAP(left, right);
}
if(bottom < top) {
INPLACESWAP(top, bottom);
}
// build the crop option
sprintf(crop, "%dx%d+%d+%d", right - left, bottom - top, left, top);
// setup IO
FilenameIO filenameIO;
memset(&filenameIO, 0, sizeof(FilenameIO));
filenameIO.src_file = src_file;
filenameIO.dst_file = dst_file;
// perform the transformation
return LosslessTransform(&filenameIO, FIJPEG_OP_NONE, crop, FALSE);
} catch(const char *text) {
FreeImage_OutputMessageProc(FIF_JPEG, text);
return FALSE;
}
}
void ImageLoader::
compatible()
{
// BITMAP数据是从下往上的, 需要翻转
FreeImage_FlipVertical(mDIB);
// FreeImage是BGR顺序, 与NVTT要求的一致, 而PVRT需要RGB顺序, 两者都需要32bits数据
if (config.imageCompressionType != CT_DXTC)
{
// 将BGR改为RGB, 交换R channel和B channel
const unsigned bytesperpixel = FreeImage_GetBPP(mDIB) / 8;
const unsigned height = FreeImage_GetHeight(mDIB);
const unsigned pitch = FreeImage_GetPitch(mDIB);
const unsigned lineSize = FreeImage_GetLine(mDIB);
BYTE* line = FreeImage_GetBits(mDIB);
for (unsigned y = 0; y < height; ++y, line += pitch) {
for (BYTE* pixel = line; pixel < line + lineSize; pixel += bytesperpixel) {
INPLACESWAP(pixel[0], pixel[2]);
}
}
}
if (FreeImage_GetBPP(mDIB) != 32)
{
FIBITMAP* convertDIB = FreeImage_ConvertTo32Bits(mDIB);
FreeImage_Unload(mDIB);
mDIB = convertDIB;
}
}
/**
Build a crop string.
@param crop Output crop string
@param left Specifies the left position of the cropped rectangle
@param top Specifies the top position of the cropped rectangle
@param right Specifies the right position of the cropped rectangle
@param bottom Specifies the bottom position of the cropped rectangle
@param width Image width
@param height Image height
@return Returns TRUE if successful, returns FALSE otherwise
*/
static BOOL
getCropString(char* crop, int* left, int* top, int* right, int* bottom, int width, int height) {
if(!left || !top || !right || !bottom) {
return FALSE;
}
*left = CLAMP(*left, 0, width);
*top = CLAMP(*top, 0, height);
// negative/zero right and bottom count from the edges inwards
if(*right <= 0) {
*right = width + *right;
}
if(*bottom <= 0) {
*bottom = height + *bottom;
}
*right = CLAMP(*right, 0, width);
*bottom = CLAMP(*bottom, 0, height);
// test for empty rect
if(((*left - *right) == 0) || ((*top - *bottom) == 0)) {
return FALSE;
}
// normalize the rectangle
if(*right < *left) {
INPLACESWAP(*left, *right);
}
if(*bottom < *top) {
INPLACESWAP(*top, *bottom);
}
// test for "noop" rect
if(*left == 0 && *right == width && *top == 0 && *bottom == height) {
return FALSE;
}
// build the crop option
sprintf(crop, "%dx%d+%d+%d", *right - *left, *bottom - *top, *left, *top);
return TRUE;
}
/**
Load uncompressed image pixels for 1-, 4-, 8-, 16-, 24- and 32-bit dib
@param io FreeImage IO
@param handle FreeImage IO handle
@param dib Image to be loaded
@param height Image height
@param pitch Image pitch
@param bit_count Image bit-depth (1-, 4-, 8-, 16-, 24- or 32-bit)
@return Returns TRUE if successful, returns FALSE otherwise
*/
static BOOL
LoadPixelData(FreeImageIO *io, fi_handle handle, FIBITMAP *dib, int height, unsigned pitch, unsigned bit_count) {
unsigned count = 0;
// Load pixel data
// NB: height can be < 0 for BMP data
if (height > 0) {
count = io->read_proc((void *)FreeImage_GetBits(dib), height * pitch, 1, handle);
if(count != 1) {
return FALSE;
}
} else {
int positiveHeight = abs(height);
for (int c = 0; c < positiveHeight; ++c) {
count = io->read_proc((void *)FreeImage_GetScanLine(dib, positiveHeight - c - 1), pitch, 1, handle);
if(count != 1) {
return FALSE;
}
}
}
// swap as needed
#ifdef FREEIMAGE_BIGENDIAN
if (bit_count == 16) {
for(unsigned y = 0; y < FreeImage_GetHeight(dib); y++) {
WORD *pixel = (WORD *)FreeImage_GetScanLine(dib, y);
for(unsigned x = 0; x < FreeImage_GetWidth(dib); x++) {
SwapShort(pixel);
pixel++;
}
}
}
#endif
#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_RGB
if (bit_count == 24 || bit_count == 32) {
for(unsigned y = 0; y < FreeImage_GetHeight(dib); y++) {
BYTE *pixel = FreeImage_GetScanLine(dib, y);
for(unsigned x = 0; x < FreeImage_GetWidth(dib); x++) {
INPLACESWAP(pixel[0], pixel[2]);
pixel += (bit_count >> 3);
}
}
}
#endif
return TRUE;
}
static FIBITMAP *
LoadOS21XBMP(FreeImageIO *io, fi_handle handle, int flags, unsigned bitmap_bits_offset) {
FIBITMAP *dib = NULL;
try {
BITMAPINFOOS2_1X_HEADER bios2_1x;
io->read_proc(&bios2_1x, sizeof(BITMAPINFOOS2_1X_HEADER), 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapOS21XHeader(&bios2_1x);
#endif
// keep some general information about the bitmap
int used_colors = 0;
int width = bios2_1x.biWidth;
int height = bios2_1x.biHeight;
int bit_count = bios2_1x.biBitCount;
int pitch = CalculatePitch(CalculateLine(width, bit_count));
switch (bit_count) {
case 1 :
case 4 :
case 8 :
{
used_colors = CalculateUsedPaletteEntries(bit_count);
// allocate enough memory to hold the bitmap (header, palette, pixels) and read the palette
dib = FreeImage_Allocate(width, height, bit_count);
if (dib == NULL)
throw "DIB allocation failed";
BITMAPINFOHEADER *pInfoHeader = FreeImage_GetInfoHeader(dib);
pInfoHeader->biXPelsPerMeter = 0;
pInfoHeader->biYPelsPerMeter = 0;
// load the palette
RGBQUAD *pal = FreeImage_GetPalette(dib);
for (int count = 0; count < used_colors; count++) {
FILE_BGR bgr;
io->read_proc(&bgr, sizeof(FILE_BGR), 1, handle);
pal[count].rgbRed = bgr.r;
pal[count].rgbGreen = bgr.g;
pal[count].rgbBlue = bgr.b;
}
// Skip over the optional palette
// A 24 or 32 bit DIB may contain a palette for faster color reduction
io->seek_proc(handle, bitmap_bits_offset, SEEK_SET);
// read the pixel data
if (height > 0) {
io->read_proc((void *)FreeImage_GetBits(dib), height * pitch, 1, handle);
} else {
for (int c = 0; c < abs(height); ++c) {
io->read_proc((void *)FreeImage_GetScanLine(dib, height - c - 1), pitch, 1, handle);
}
}
return dib;
}
case 16 :
{
dib = FreeImage_Allocate(width, height, bit_count, FI16_555_RED_MASK, FI16_555_GREEN_MASK, FI16_555_BLUE_MASK);
if (dib == NULL)
throw "DIB allocation failed";
BITMAPINFOHEADER *pInfoHeader = FreeImage_GetInfoHeader(dib);
pInfoHeader->biXPelsPerMeter = 0;
pInfoHeader->biYPelsPerMeter = 0;
io->read_proc(FreeImage_GetBits(dib), height * pitch, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
for(int y = 0; y < FreeImage_GetHeight(dib); y++) {
WORD *pixel = (WORD *)FreeImage_GetScanLine(dib, y);
for(int x = 0; x < FreeImage_GetWidth(dib); x++) {
SwapShort(pixel);
pixel++;
}
}
#endif
return dib;
}
case 24 :
case 32 :
{
if( bit_count == 32 ) {
dib = FreeImage_Allocate(width, height, bit_count, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
} else {
dib = FreeImage_Allocate(width, height, bit_count, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
}
if (dib == NULL)
throw "DIB allocation failed";
BITMAPINFOHEADER *pInfoHeader = FreeImage_GetInfoHeader(dib);
pInfoHeader->biXPelsPerMeter = 0;
pInfoHeader->biYPelsPerMeter = 0;
// Skip over the optional palette
// A 24 or 32 bit DIB may contain a palette for faster color reduction
io->read_proc(FreeImage_GetBits(dib), height * pitch, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
for(int y = 0; y < FreeImage_GetHeight(dib); y++) {
BYTE *pixel = FreeImage_GetScanLine(dib, y);
for(int x = 0; x < FreeImage_GetWidth(dib); x++) {
INPLACESWAP(pixel[0], pixel[2]);
pixel += (bit_count>>3);
}
}
#endif
// check if the bitmap contains transparency, if so enable it in the header
FreeImage_SetTransparent(dib, (FreeImage_GetColorType(dib) == FIC_RGBALPHA));
return dib;
}
}
} catch(const char *message) {
if(dib)
FreeImage_Unload(dib);
FreeImage_OutputMessageProc(s_format_id, message);
}
return NULL;
}
static FIBITMAP *
LoadOS22XBMP(FreeImageIO *io, fi_handle handle, int flags, unsigned bitmap_bits_offset) {
FIBITMAP *dib = NULL;
try {
// load the info header
BITMAPINFOHEADER bih;
io->read_proc(&bih, sizeof(BITMAPINFOHEADER), 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapInfoHeader(&bih);
#endif
// keep some general information about the bitmap
int used_colors = bih.biClrUsed;
int width = bih.biWidth;
int height = bih.biHeight;
int bit_count = bih.biBitCount;
int compression = bih.biCompression;
int pitch = CalculatePitch(CalculateLine(width, bit_count));
switch (bit_count) {
case 1 :
case 4 :
case 8 :
{
if ((used_colors <= 0) || (used_colors > CalculateUsedPaletteEntries(bit_count)))
used_colors = CalculateUsedPaletteEntries(bit_count);
// allocate enough memory to hold the bitmap (header, palette, pixels) and read the palette
dib = FreeImage_Allocate(width, height, bit_count);
if (dib == NULL)
throw "DIB allocation failed";
BITMAPINFOHEADER *pInfoHeader = FreeImage_GetInfoHeader(dib);
pInfoHeader->biXPelsPerMeter = bih.biXPelsPerMeter;
pInfoHeader->biYPelsPerMeter = bih.biYPelsPerMeter;
// load the palette
io->seek_proc(handle, sizeof(BITMAPFILEHEADER) + bih.biSize, SEEK_SET);
RGBQUAD *pal = FreeImage_GetPalette(dib);
for (int count = 0; count < used_colors; count++) {
FILE_BGR bgr;
io->read_proc(&bgr, sizeof(FILE_BGR), 1, handle);
pal[count].rgbRed = bgr.r;
pal[count].rgbGreen = bgr.g;
pal[count].rgbBlue = bgr.b;
}
// seek to the actual pixel data.
// this is needed because sometimes the palette is larger than the entries it contains predicts
if (bitmap_bits_offset > (sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + (used_colors * 3)))
io->seek_proc(handle, bitmap_bits_offset, SEEK_SET);
// read the pixel data
switch (compression) {
case BI_RGB :
if (height > 0) {
io->read_proc((void *)FreeImage_GetBits(dib), height * pitch, 1, handle);
} else {
for (int c = 0; c < abs(height); ++c) {
io->read_proc((void *)FreeImage_GetScanLine(dib, height - c - 1), pitch, 1, handle);
}
}
return dib;
case BI_RLE4 :
{
BYTE status_byte = 0;
BYTE second_byte = 0;
int scanline = 0;
int bits = 0;
BOOL low_nibble = FALSE;
for (;;) {
io->read_proc(&status_byte, sizeof(BYTE), 1, handle);
switch (status_byte) {
case RLE_COMMAND :
io->read_proc(&status_byte, sizeof(BYTE), 1, handle);
switch (status_byte) {
case RLE_ENDOFLINE :
bits = 0;
scanline++;
low_nibble = FALSE;
break;
case RLE_ENDOFBITMAP :
return (FIBITMAP *)dib;
case RLE_DELTA :
{
// read the delta values
BYTE delta_x;
BYTE delta_y;
io->read_proc(&delta_x, sizeof(BYTE), 1, handle);
io->read_proc(&delta_y, sizeof(BYTE), 1, handle);
// apply them
bits += delta_x / 2;
scanline += delta_y;
break;
}
default :
io->read_proc(&second_byte, sizeof(BYTE), 1, handle);
BYTE *sline = FreeImage_GetScanLine(dib, scanline);
for (int i = 0; i < status_byte; i++) {
if (low_nibble) {
*(sline + bits) |= LOWNIBBLE(second_byte);
if (i != status_byte - 1)
io->read_proc(&second_byte, sizeof(BYTE), 1, handle);
bits++;
} else {
*(sline + bits) |= HINIBBLE(second_byte);
}
low_nibble = !low_nibble;
}
if (((status_byte / 2) & 1 ) == 1)
io->read_proc(&second_byte, sizeof(BYTE), 1, handle);
break;
};
break;
default :
{
BYTE *sline = FreeImage_GetScanLine(dib, scanline);
io->read_proc(&second_byte, sizeof(BYTE), 1, handle);
for (unsigned i = 0; i < status_byte; i++) {
if (low_nibble) {
*(sline + bits) |= LOWNIBBLE(second_byte);
bits++;
} else {
*(sline + bits) |= HINIBBLE(second_byte);
}
low_nibble = !low_nibble;
}
}
break;
};
}
break;
}
case BI_RLE8 :
{
BYTE status_byte = 0;
BYTE second_byte = 0;
int scanline = 0;
int bits = 0;
for (;;) {
io->read_proc(&status_byte, sizeof(BYTE), 1, handle);
switch (status_byte) {
case RLE_COMMAND :
io->read_proc(&status_byte, sizeof(BYTE), 1, handle);
switch (status_byte) {
case RLE_ENDOFLINE :
bits = 0;
scanline++;
break;
case RLE_ENDOFBITMAP :
return (FIBITMAP *)dib;
case RLE_DELTA :
{
// read the delta values
BYTE delta_x;
BYTE delta_y;
io->read_proc(&delta_x, sizeof(BYTE), 1, handle);
io->read_proc(&delta_y, sizeof(BYTE), 1, handle);
// apply them
bits += delta_x;
scanline += delta_y;
break;
}
default :
io->read_proc((void *)(FreeImage_GetScanLine(dib, scanline) + bits), sizeof(BYTE) * status_byte, 1, handle);
// align run length to even number of bytes
if ((status_byte & 1) == 1)
io->read_proc(&second_byte, sizeof(BYTE), 1, handle);
bits += status_byte;
break;
};
break;
default :
BYTE *sline = FreeImage_GetScanLine(dib, scanline);
io->read_proc(&second_byte, sizeof(BYTE), 1, handle);
for (unsigned i = 0; i < status_byte; i++) {
*(sline + bits) = second_byte;
bits++;
}
break;
};
}
break;
}
default :
throw "compression type not supported";
}
break;
}
case 16 :
{
if (bih.biCompression == 3) {
DWORD bitfields[3];
io->read_proc(bitfields, 3 * sizeof(DWORD), 1, handle);
dib = FreeImage_Allocate(width, height, bit_count, bitfields[0], bitfields[1], bitfields[2]);
} else {
dib = FreeImage_Allocate(width, height, bit_count, FI16_555_RED_MASK, FI16_555_GREEN_MASK, FI16_555_BLUE_MASK);
}
if (dib == NULL)
throw "DIB allocation failed";
BITMAPINFOHEADER *pInfoHeader = FreeImage_GetInfoHeader(dib);
pInfoHeader->biXPelsPerMeter = bih.biXPelsPerMeter;
pInfoHeader->biYPelsPerMeter = bih.biYPelsPerMeter;
if (bitmap_bits_offset > (sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + (used_colors * 3)))
io->seek_proc(handle, bitmap_bits_offset, SEEK_SET);
io->read_proc(FreeImage_GetBits(dib), height * pitch, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
for(int y = 0; y < FreeImage_GetHeight(dib); y++) {
WORD *pixel = (WORD *)FreeImage_GetScanLine(dib, y);
for(int x = 0; x < FreeImage_GetWidth(dib); x++) {
SwapShort(pixel);
pixel++;
}
}
#endif
return dib;
}
case 24 :
case 32 :
{
if( bit_count == 32 ) {
dib = FreeImage_Allocate(width, height, bit_count, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
} else {
dib = FreeImage_Allocate(width, height, bit_count, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
}
if (dib == NULL)
throw "DIB allocation failed";
BITMAPINFOHEADER *pInfoHeader = FreeImage_GetInfoHeader(dib);
pInfoHeader->biXPelsPerMeter = bih.biXPelsPerMeter;
pInfoHeader->biYPelsPerMeter = bih.biYPelsPerMeter;
// Skip over the optional palette
// A 24 or 32 bit DIB may contain a palette for faster color reduction
if (bitmap_bits_offset > (sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + (used_colors * 3)))
io->seek_proc(handle, bitmap_bits_offset, SEEK_SET);
// read in the bitmap bits
io->read_proc(FreeImage_GetBits(dib), height * pitch, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
for(int y = 0; y < FreeImage_GetHeight(dib); y++) {
BYTE *pixel = FreeImage_GetScanLine(dib, y);
for(int x = 0; x < FreeImage_GetWidth(dib); x++) {
INPLACESWAP(pixel[0], pixel[2]);
pixel += (bit_count>>3);
}
}
#endif
// check if the bitmap contains transparency, if so enable it in the header
FreeImage_SetTransparent(dib, (FreeImage_GetColorType(dib) == FIC_RGBALPHA));
return dib;
}
}
} catch(const char *message) {
if(dib)
FreeImage_Unload(dib);
FreeImage_OutputMessageProc(s_format_id, message);
}
return NULL;
}
static HBITMAP
GetDibSection(FIBITMAP *src, HDC hdc, int left, int top, int right, int bottom)
{
if(!src)
return NULL;
unsigned bpp = FreeImage_GetBPP(src);
if(bpp <=4)
return NULL;
// normalize the rectangle
if(right < left)
INPLACESWAP(left, right);
if(bottom < top)
INPLACESWAP(top, bottom);
// check the size of the sub image
int src_width = FreeImage_GetWidth(src);
int src_height = FreeImage_GetHeight(src);
int src_pitch = FreeImage_GetPitch(src);
if((left < 0) || (right > src_width) || (top < 0) || (bottom > src_height))
return NULL;
// allocate the sub image
int dst_width = (right - left);
int dst_height = (bottom - top);
BITMAPINFO *info = (BITMAPINFO *) malloc(sizeof(BITMAPINFO) + (FreeImage_GetColorsUsed(src) * sizeof(RGBQUAD)));
BITMAPINFOHEADER *bih = (BITMAPINFOHEADER *)info;
bih->biSize = sizeof(BITMAPINFOHEADER);
bih->biWidth = dst_width;
bih->biHeight = dst_height;
bih->biPlanes = 1;
bih->biBitCount = bpp;
bih->biCompression = BI_RGB;
bih->biSizeImage = 0;
bih->biXPelsPerMeter = 0;
bih->biYPelsPerMeter = 0;
bih->biClrUsed = 0; // Always use the whole palette.
bih->biClrImportant = 0;
// copy the palette
if(bpp < 16)
memcpy(info->bmiColors, FreeImage_GetPalette(src), FreeImage_GetColorsUsed(src) * sizeof(RGBQUAD));
BYTE *dst_bits;
HBITMAP hbitmap = CreateDIBSection(hdc, info, DIB_RGB_COLORS, (void **) &dst_bits, NULL, 0);
free(info);
if(hbitmap == NULL || dst_bits == NULL)
return NULL;
// get the pointers to the bits and such
BYTE *src_bits = FreeImage_GetScanLine(src, src_height - top - dst_height);
// calculate the number of bytes per pixel
unsigned bytespp = FreeImage_GetLine(src) / FreeImage_GetWidth(src);
// point to x = left
src_bits += (left * bytespp);
int dst_line = (dst_width * bpp + 7) / 8;
int dst_pitch = (dst_line + 3) & ~3;
for(int y = 0; y < dst_height; y++)
memcpy(dst_bits + (y * dst_pitch), src_bits + (y * src_pitch), dst_line);
return hbitmap;
}
FIBITMAP * DLL_CALLCONV
FreeImage_RescaleRect(FIBITMAP *src, int dst_width, int dst_height, int src_left, int src_top, int src_right, int src_bottom, FREE_IMAGE_FILTER filter, unsigned flags) {
FIBITMAP *dst = NULL;
const int src_width = FreeImage_GetWidth(src);
const int src_height = FreeImage_GetHeight(src);
if (!FreeImage_HasPixels(src) || (dst_width <= 0) || (dst_height <= 0) || (src_width <= 0) || (src_height <= 0)) {
return NULL;
}
// normalize the rectangle
if (src_right < src_left) {
INPLACESWAP(src_left, src_right);
}
if (src_bottom < src_top) {
INPLACESWAP(src_top, src_bottom);
}
// check the size of the sub image
if((src_left < 0) || (src_right > src_width) || (src_top < 0) || (src_bottom > src_height)) {
return NULL;
}
// select the filter
CGenericFilter *pFilter = NULL;
switch (filter) {
case FILTER_BOX:
pFilter = new(std::nothrow) CBoxFilter();
break;
case FILTER_BICUBIC:
pFilter = new(std::nothrow) CBicubicFilter();
break;
case FILTER_BILINEAR:
pFilter = new(std::nothrow) CBilinearFilter();
break;
case FILTER_BSPLINE:
pFilter = new(std::nothrow) CBSplineFilter();
break;
case FILTER_CATMULLROM:
pFilter = new(std::nothrow) CCatmullRomFilter();
break;
case FILTER_LANCZOS3:
pFilter = new(std::nothrow) CLanczos3Filter();
break;
}
if (!pFilter) {
return NULL;
}
CResizeEngine Engine(pFilter);
dst = Engine.scale(src, dst_width, dst_height, src_left, src_top,
src_right - src_left, src_bottom - src_top, flags);
delete pFilter;
if ((flags & FI_RESCALE_OMIT_METADATA) != FI_RESCALE_OMIT_METADATA) {
// copy metadata from src to dst
FreeImage_CloneMetadata(dst, src);
}
return dst;
}
static FIBITMAP * DLL_CALLCONV
Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {
if (handle) {
FIBITMAP *dib = NULL;
try {
// set up the jpeglib structures
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
// step 1: allocate and initialize JPEG decompression object
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = jpeg_error_exit;
jerr.output_message = jpeg_output_message;
jpeg_create_decompress(&cinfo);
// step 2a: specify data source (eg, a handle)
jpeg_freeimage_src(&cinfo, handle, io);
// step 2b: save special markers for later reading
jpeg_save_markers(&cinfo, JPEG_COM, 0xFFFF);
for(int m = 0; m < 16; m++) {
jpeg_save_markers(&cinfo, JPEG_APP0 + m, 0xFFFF);
}
// step 3: read handle parameters with jpeg_read_header()
jpeg_read_header(&cinfo, TRUE);
// step 4: set parameters for decompression
unsigned int scale_denom = 1; // fraction by which to scale image
int requested_size = flags >> 16; // requested user size in pixels
if(requested_size > 0) {
// the JPEG codec can perform x2, x4 or x8 scaling on loading
// try to find the more appropriate scaling according to user's need
double scale = MAX((double)cinfo.image_width, (double)cinfo.image_height) / (double)requested_size;
if(scale >= 8) {
scale_denom = 8;
} else if(scale >= 4) {
scale_denom = 4;
} else if(scale >= 2) {
scale_denom = 2;
}
}
cinfo.scale_num = 1;
cinfo.scale_denom = scale_denom;
if ((flags & JPEG_ACCURATE) != JPEG_ACCURATE) {
cinfo.dct_method = JDCT_IFAST;
cinfo.do_fancy_upsampling = FALSE;
}
// step 5a: start decompressor and calculate output width and height
jpeg_start_decompress(&cinfo);
// step 5b: allocate dib and init header
if((cinfo.num_components == 4) && (cinfo.out_color_space == JCS_CMYK)) {
// CMYK image
if((flags & JPEG_CMYK) == JPEG_CMYK) {
// load as CMYK
dib = FreeImage_Allocate(cinfo.output_width, cinfo.output_height, 32, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
if(!dib) return NULL;
FreeImage_GetICCProfile(dib)->flags |= FIICC_COLOR_IS_CMYK;
} else {
// load as CMYK and convert to RGB
dib = FreeImage_Allocate(cinfo.output_width, cinfo.output_height, 24, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
if(!dib) return NULL;
}
} else {
// RGB or greyscale image
dib = FreeImage_Allocate(cinfo.output_width, cinfo.output_height, 8 * cinfo.num_components, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
if(!dib) return NULL;
if (cinfo.num_components == 1) {
// build a greyscale palette
RGBQUAD *colors = FreeImage_GetPalette(dib);
for (int i = 0; i < 256; i++) {
colors[i].rgbRed = (BYTE)i;
colors[i].rgbGreen = (BYTE)i;
colors[i].rgbBlue = (BYTE)i;
}
}
}
if(scale_denom != 1) {
// store original size info if a scaling was requested
store_size_info(dib, cinfo.image_width, cinfo.image_height);
}
// step 5c: handle metrices
if (cinfo.density_unit == 1) {
// dots/inch
FreeImage_SetDotsPerMeterX(dib, (unsigned) (((float)cinfo.X_density) / 0.0254000 + 0.5));
FreeImage_SetDotsPerMeterY(dib, (unsigned) (((float)cinfo.Y_density) / 0.0254000 + 0.5));
} else if (cinfo.density_unit == 2) {
// dots/cm
FreeImage_SetDotsPerMeterX(dib, (unsigned) (cinfo.X_density * 100));
FreeImage_SetDotsPerMeterY(dib, (unsigned) (cinfo.Y_density * 100));
}
// step 6a: while (scan lines remain to be read) jpeg_read_scanlines(...);
if((cinfo.out_color_space == JCS_CMYK) && ((flags & JPEG_CMYK) != JPEG_CMYK)) {
// convert from CMYK to RGB
JSAMPARRAY buffer; // output row buffer
unsigned row_stride; // physical row width in output buffer
// JSAMPLEs per row in output buffer
row_stride = cinfo.output_width * cinfo.output_components;
// make a one-row-high sample array that will go away when done with image
buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
while (cinfo.output_scanline < cinfo.output_height) {
JSAMPROW src = buffer[0];
JSAMPROW dst = FreeImage_GetScanLine(dib, cinfo.output_height - cinfo.output_scanline - 1);
jpeg_read_scanlines(&cinfo, buffer, 1);
for(unsigned x = 0; x < FreeImage_GetWidth(dib); x++) {
WORD K = (WORD)src[3];
dst[FI_RGBA_RED] = (BYTE)((K * src[0]) / 255);
dst[FI_RGBA_GREEN] = (BYTE)((K * src[1]) / 255);
dst[FI_RGBA_BLUE] = (BYTE)((K * src[2]) / 255);
src += 4;
dst += 3;
}
}
} else {
// normal case (RGB or greyscale image)
while (cinfo.output_scanline < cinfo.output_height) {
JSAMPROW dst = FreeImage_GetScanLine(dib, cinfo.output_height - cinfo.output_scanline - 1);
jpeg_read_scanlines(&cinfo, &dst, 1);
}
// step 6b: swap red and blue components (see LibJPEG/jmorecfg.h: #define RGB_RED, ...)
// The default behavior of the JPEG library is kept "as is" because LibTIFF uses
// LibJPEG "as is".
#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
if(cinfo.num_components == 3) {
for(unsigned y = 0; y < FreeImage_GetHeight(dib); y++) {
BYTE *target = FreeImage_GetScanLine(dib, y);
for(unsigned x = 0; x < FreeImage_GetWidth(dib); x++) {
INPLACESWAP(target[0], target[2]);
target += 3;
}
}
}
#endif
}
// step 7: read special markers
read_markers(&cinfo, dib);
// step 8: finish decompression
jpeg_finish_decompress(&cinfo);
// step 9: release JPEG decompression object
jpeg_destroy_decompress(&cinfo);
// check for automatic Exif rotation
if((flags & JPEG_EXIFROTATE) == JPEG_EXIFROTATE) {
rotate_exif(&dib);
}
// everything went well. return the loaded dib
return (FIBITMAP *)dib;
} catch (...) {
if(NULL != dib) {
FreeImage_Unload(dib);
}
}
}
return NULL;
}
static BOOL DLL_CALLCONV
Save(FreeImageIO *io, FIBITMAP *dib, fi_handle handle, int page, int flags, void *data) {
if ((dib) && (handle)) {
try {
// Check dib format
const char *sError = "only 24-bit highcolor or 8-bit greyscale/palette bitmaps can be saved as JPEG";
FREE_IMAGE_COLOR_TYPE color_type = FreeImage_GetColorType(dib);
WORD bpp = (WORD)FreeImage_GetBPP(dib);
if ((bpp != 24) && (bpp != 8))
throw sError;
if(bpp == 8) {
// allow grey, reverse grey and palette
if ((color_type != FIC_MINISBLACK) && (color_type != FIC_MINISWHITE) && (color_type != FIC_PALETTE))
throw sError;
}
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
// Step 1: allocate and initialize JPEG compression object
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = jpeg_error_exit;
jerr.output_message = jpeg_output_message;
// Now we can initialize the JPEG compression object
jpeg_create_compress(&cinfo);
// Step 2: specify data destination (eg, a file)
jpeg_freeimage_dst(&cinfo, handle, io);
// Step 3: set parameters for compression
cinfo.image_width = FreeImage_GetWidth(dib);
cinfo.image_height = FreeImage_GetHeight(dib);
switch(color_type) {
case FIC_MINISBLACK :
case FIC_MINISWHITE :
cinfo.in_color_space = JCS_GRAYSCALE;
cinfo.input_components = 1;
break;
default :
cinfo.in_color_space = JCS_RGB;
cinfo.input_components = 3;
break;
}
jpeg_set_defaults(&cinfo);
// progressive-JPEG support
if((flags & JPEG_PROGRESSIVE) == JPEG_PROGRESSIVE) {
jpeg_simple_progression(&cinfo);
}
// Set JFIF density parameters from the DIB data
cinfo.X_density = (UINT16) (0.5 + 0.0254 * FreeImage_GetDotsPerMeterX(dib));
cinfo.Y_density = (UINT16) (0.5 + 0.0254 * FreeImage_GetDotsPerMeterY(dib));
cinfo.density_unit = 1; // dots / inch
// set subsampling options if required
if(cinfo.in_color_space == JCS_RGB) {
if((flags & JPEG_SUBSAMPLING_411) == JPEG_SUBSAMPLING_411) {
// 4:1:1 (4x1 1x1 1x1) - CrH 25% - CbH 25% - CrV 100% - CbV 100%
// the horizontal color resolution is quartered
cinfo.comp_info[0].h_samp_factor = 4; // Y
cinfo.comp_info[0].v_samp_factor = 1;
cinfo.comp_info[1].h_samp_factor = 1; // Cb
cinfo.comp_info[1].v_samp_factor = 1;
cinfo.comp_info[2].h_samp_factor = 1; // Cr
cinfo.comp_info[2].v_samp_factor = 1;
} else if((flags & JPEG_SUBSAMPLING_420) == JPEG_SUBSAMPLING_420) {
// 4:2:0 (2x2 1x1 1x1) - CrH 50% - CbH 50% - CrV 50% - CbV 50%
// the chrominance resolution in both the horizontal and vertical directions is cut in half
cinfo.comp_info[0].h_samp_factor = 2; // Y
cinfo.comp_info[0].v_samp_factor = 2;
cinfo.comp_info[1].h_samp_factor = 1; // Cb
cinfo.comp_info[1].v_samp_factor = 1;
cinfo.comp_info[2].h_samp_factor = 1; // Cr
cinfo.comp_info[2].v_samp_factor = 1;
} else if((flags & JPEG_SUBSAMPLING_422) == JPEG_SUBSAMPLING_422){ //2x1 (low)
// 4:2:2 (2x1 1x1 1x1) - CrH 50% - CbH 50% - CrV 100% - CbV 100%
// half of the horizontal resolution in the chrominance is dropped (Cb & Cr),
// while the full resolution is retained in the vertical direction, with respect to the luminance
cinfo.comp_info[0].h_samp_factor = 2; // Y
cinfo.comp_info[0].v_samp_factor = 1;
cinfo.comp_info[1].h_samp_factor = 1; // Cb
cinfo.comp_info[1].v_samp_factor = 1;
cinfo.comp_info[2].h_samp_factor = 1; // Cr
cinfo.comp_info[2].v_samp_factor = 1;
}
else if((flags & JPEG_SUBSAMPLING_444) == JPEG_SUBSAMPLING_444){ //1x1 (no subsampling)
// 4:4:4 (1x1 1x1 1x1) - CrH 100% - CbH 100% - CrV 100% - CbV 100%
// the resolution of chrominance information (Cb & Cr) is preserved
// at the same rate as the luminance (Y) information
cinfo.comp_info[0].h_samp_factor = 1; // Y
cinfo.comp_info[0].v_samp_factor = 1;
cinfo.comp_info[1].h_samp_factor = 1; // Cb
cinfo.comp_info[1].v_samp_factor = 1;
cinfo.comp_info[2].h_samp_factor = 1; // Cr
cinfo.comp_info[2].v_samp_factor = 1;
}
}
// Step 4: set quality
// the first 7 bits are reserved for low level quality settings
// the other bits are high level (i.e. enum-ish)
int quality;
if ((flags & JPEG_QUALITYBAD) == JPEG_QUALITYBAD) {
quality = 10;
} else if ((flags & JPEG_QUALITYAVERAGE) == JPEG_QUALITYAVERAGE) {
quality = 25;
} else if ((flags & JPEG_QUALITYNORMAL) == JPEG_QUALITYNORMAL) {
quality = 50;
} else if ((flags & JPEG_QUALITYGOOD) == JPEG_QUALITYGOOD) {
quality = 75;
} else if ((flags & JPEG_QUALITYSUPERB) == JPEG_QUALITYSUPERB) {
quality = 100;
} else {
if ((flags & 0x7F) == 0) {
quality = 75;
} else {
quality = flags & 0x7F;
}
}
jpeg_set_quality(&cinfo, quality, TRUE); /* limit to baseline-JPEG values */
// Step 5: Start compressor
jpeg_start_compress(&cinfo, TRUE);
// Step 6: Write special markers
write_markers(&cinfo, dib);
// Step 7: while (scan lines remain to be written)
if(color_type == FIC_RGB) {
// 24-bit RGB image : need to swap red and blue channels
unsigned pitch = FreeImage_GetPitch(dib);
BYTE *target = (BYTE*)malloc(pitch * sizeof(BYTE));
if (target == NULL) {
throw FI_MSG_ERROR_MEMORY;
}
while (cinfo.next_scanline < cinfo.image_height) {
// get a copy of the scanline
memcpy(target, FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1), pitch);
#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
// swap R and B channels
BYTE *target_p = target;
for(unsigned x = 0; x < cinfo.image_width; x++) {
INPLACESWAP(target_p[0], target_p[2]);
target_p += 3;
}
#endif
// write the scanline
jpeg_write_scanlines(&cinfo, &target, 1);
}
free(target);
}
else if(color_type == FIC_MINISBLACK) {
// 8-bit standard greyscale images
while (cinfo.next_scanline < cinfo.image_height) {
JSAMPROW b = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1);
jpeg_write_scanlines(&cinfo, &b, 1);
}
}
else if(color_type == FIC_PALETTE) {
// 8-bit palettized images are converted to 24-bit images
RGBQUAD *palette = FreeImage_GetPalette(dib);
BYTE *target = (BYTE*)malloc(cinfo.image_width * 3);
if (target == NULL) {
throw FI_MSG_ERROR_MEMORY;
}
while (cinfo.next_scanline < cinfo.image_height) {
BYTE *source = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1);
FreeImage_ConvertLine8To24(target, source, cinfo.image_width, palette);
#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
// swap R and B channels
BYTE *target_p = target;
for(unsigned x = 0; x < cinfo.image_width; x++) {
INPLACESWAP(target_p[0], target_p[2]);
target_p += 3;
}
#endif
jpeg_write_scanlines(&cinfo, &target, 1);
}
free(target);
}
else if(color_type == FIC_MINISWHITE) {
// reverse 8-bit greyscale image, so reverse grey value on the fly
unsigned i;
BYTE reverse[256];
BYTE *target = (BYTE *)malloc(cinfo.image_width);
if (target == NULL) {
throw FI_MSG_ERROR_MEMORY;
}
for(i = 0; i < 256; i++) {
reverse[i] = (BYTE)(255 - i);
}
while(cinfo.next_scanline < cinfo.image_height) {
BYTE *source = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1);
for(i = 0; i < cinfo.image_width; i++) {
target[i] = reverse[ source[i] ];
}
jpeg_write_scanlines(&cinfo, &target, 1);
}
free(target);
}
// Step 8: Finish compression
jpeg_finish_compress(&cinfo);
// Step 9: release JPEG compression object
jpeg_destroy_compress(&cinfo);
return TRUE;
} catch (const char *text) {
FreeImage_OutputMessageProc(s_format_id, text);
return FALSE;
} catch (FREE_IMAGE_FORMAT) {
return FALSE;
}
}
return FALSE;
}
static FIBITMAP * DLL_CALLCONV
Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {
if (handle != NULL) {
FIBITMAP *dib = NULL;
DWORD type, size;
io->read_proc(&type, 4, 1, handle);
#ifndef FREEIMAGE_BIGENDIAN
SwapLong(&type);
#endif
if(type != ID_FORM)
return NULL;
io->read_proc(&size, 4, 1, handle);
#ifndef FREEIMAGE_BIGENDIAN
SwapLong(&size);
#endif
io->read_proc(&type, 4, 1, handle);
#ifndef FREEIMAGE_BIGENDIAN
SwapLong(&type);
#endif
if((type != ID_ILBM) && (type != ID_PBM))
return NULL;
size -= 4;
unsigned width = 0, height = 0, planes = 0, depth = 0, comp = 0;
while (size) {
DWORD ch_type,ch_size;
io->read_proc(&ch_type, 4, 1, handle);
#ifndef FREEIMAGE_BIGENDIAN
SwapLong(&ch_type);
#endif
io->read_proc(&ch_size,4,1,handle );
#ifndef FREEIMAGE_BIGENDIAN
SwapLong(&ch_size);
#endif
unsigned ch_end = io->tell_proc(handle) + ch_size;
if (ch_type == ID_BMHD) { // Bitmap Header
if (dib)
FreeImage_Unload(dib);
BMHD bmhd;
io->read_proc(&bmhd, sizeof(bmhd), 1, handle);
#ifndef FREEIMAGE_BIGENDIAN
SwapHeader(&bmhd);
#endif
width = bmhd.w;
height = bmhd.h;
planes = bmhd.nPlanes;
comp = bmhd.compression;
if(bmhd.masking & 1)
planes++; // there is a mask ( 'stencil' )
if (planes > 8 && planes != 24)
return NULL;
depth = planes > 8 ? 24 : 8;
if( depth == 24 ) {
dib = FreeImage_Allocate(width, height, depth, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
} else {
dib = FreeImage_Allocate(width, height, depth);
}
} else if (ch_type == ID_CMAP) { // Palette (Color Map)
if (!dib)
return NULL;
RGBQUAD *pal = FreeImage_GetPalette(dib);
for (unsigned k = 0; k < ch_size / 3; k++) {
io->read_proc(&pal[k].rgbRed, 1, 1, handle );
io->read_proc(&pal[k].rgbGreen, 1, 1, handle );
io->read_proc(&pal[k].rgbBlue, 1, 1, handle );
}
} else if (ch_type == ID_BODY) {
if (!dib)
return NULL;
if (type == ID_PBM) {
// NON INTERLACED (LBM)
unsigned line = FreeImage_GetLine(dib) + 1 & ~1;
for (unsigned i = 0; i < FreeImage_GetHeight(dib); i++) {
BYTE *bits = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - i - 1);
if (comp == 1) {
// use RLE compression
DWORD number_of_bytes_written = 0;
BYTE rle_count;
BYTE byte;
while (number_of_bytes_written < line) {
io->read_proc(&rle_count, 1, 1, handle);
if (rle_count < 128) {
for (int k = 0; k < rle_count + 1; k++) {
io->read_proc(&byte, 1, 1, handle);
bits[number_of_bytes_written++] += byte;
}
} else if (rle_count > 128) {
io->read_proc(&byte, 1, 1, handle);
for (int k = 0; k < 257 - rle_count; k++) {
bits[number_of_bytes_written++] += byte;
}
}
}
} else {
// don't use compression
io->read_proc(bits, line, 1, handle);
}
}
return dib;
} else {
// INTERLACED (ILBM)
unsigned pixel_size = depth/8;
unsigned n_width=(width+15)&~15;
unsigned plane_size = n_width/8;
unsigned src_size = plane_size * planes;
BYTE *src = (BYTE*)malloc(src_size);
BYTE *dest = FreeImage_GetBits(dib);
dest += FreeImage_GetPitch(dib) * height;
for (unsigned y = 0; y < height; y++) {
dest -= FreeImage_GetPitch(dib);
// read all planes in one hit,
// 'coz PSP compresses across planes...
if (comp) {
// unpacker algorithm
for(unsigned x = 0; x < src_size;) {
// read the next source byte into t
signed char t = 0;
io->read_proc(&t, 1, 1, handle);
if (t >= 0) {
// t = [0..127] => copy the next t+1 bytes literally
unsigned size_to_read = t + 1;
if((size_to_read + x) > src_size) {
// sanity check for buffer overruns
size_to_read = src_size - x;
io->read_proc(src + x, size_to_read, 1, handle);
x += (t + 1);
} else {
io->read_proc(src + x, size_to_read, 1, handle);
x += size_to_read;
}
} else if (t != -128) {
// t = [-1..-127] => replicate the next byte -t+1 times
BYTE b = 0;
io->read_proc(&b, 1, 1, handle);
unsigned size_to_copy = (unsigned)(-(int)t + 1);
if((size_to_copy + x) > src_size) {
// sanity check for buffer overruns
size_to_copy = src_size - x;
memset(src + x, b, size_to_copy);
x += (unsigned)(-(int)t + 1);
} else {
memset(src + x, b, size_to_copy);
x += size_to_copy;
}
}
// t = -128 => noop
}
} else {
io->read_proc(src, src_size, 1, handle);
}
// lazy planar->chunky...
for (unsigned x = 0; x < width; x++) {
for (unsigned n = 0; n < planes; n++) {
BYTE bit = (BYTE)( src[n * plane_size + (x / 8)] >> ((x^7) & 7) );
dest[x * pixel_size + (n / 8)] |= (bit & 1) << (n & 7);
}
}
#ifndef FREEIMAGE_BIGENDIAN
if (depth == 24) {
for (unsigned x = 0; x < width; ++x){
INPLACESWAP(dest[x * 3], dest[x * 3 + 2]);
}
}
#endif
}
free(src);
return dib;
}
}
// Every odd-length chunk is followed by a 0 pad byte. This pad
// byte is not counted in ch_size.
if (ch_size & 1) {
ch_size++;
ch_end++;
}
io->seek_proc(handle, ch_end - io->tell_proc(handle), SEEK_CUR);
size -= ch_size + 8;
}
if (dib)
FreeImage_Unload(dib);
}