int main(int argc, char **argv)
{
int i, ErrorCode;
GifFileType *GifFileIn, *GifFileOut = (GifFileType *)NULL;
if ((GifFileIn = DGifOpenFileHandle(0, &ErrorCode)) == NULL) {
PrintGifError(ErrorCode);
exit(EXIT_FAILURE);
}
if (DGifSlurp(GifFileIn) == GIF_ERROR) {
PrintGifError(GifFileIn->Error);
exit(EXIT_FAILURE);
}
if ((GifFileOut = EGifOpenFileHandle(1, &ErrorCode)) == NULL) {
PrintGifError(ErrorCode);
exit(EXIT_FAILURE);
}
/*
* Your operations on in-core structures go here.
* This code just copies the header and each image from the incoming file.
*/
GifFileOut->SWidth = GifFileIn->SWidth;
GifFileOut->SHeight = GifFileIn->SHeight;
GifFileOut->SColorResolution = GifFileIn->SColorResolution;
GifFileOut->SBackGroundColor = GifFileIn->SBackGroundColor;
GifFileOut->SColorMap = GifMakeMapObject(
GifFileIn->SColorMap->ColorCount,
GifFileIn->SColorMap->Colors);
for (i = 0; i < GifFileIn->ImageCount; i++)
(void) GifMakeSavedImage(GifFileOut, &GifFileIn->SavedImages[i]);
/*
* Note: don't do DGifCloseFile early, as this will
* deallocate all the memory containing the GIF data!
*
* Further note: EGifSpew() doesn't try to validity-check any of this
* data; it's *your* responsibility to keep your changes consistent.
* Caveat hacker!
*/
if (EGifSpew(GifFileOut) == GIF_ERROR)
PrintGifError(GifFileOut->Error);
if (DGifCloseFile(GifFileIn, &ErrorCode) == GIF_ERROR)
PrintGifError(ErrorCode);
if (EGifCloseFile(GifFileOut, &ErrorCode) == GIF_ERROR)
PrintGifError(ErrorCode);
return 0;
}
bool CMakeGifDoc::addImagesToGif() {
const PixRectArray &prArray = getQuantizedPrArray();
if(prArray.size() == 0) {
return false;
}
if(!hasGifFile()) {
const CSize size = prArray.getMaxSize();
m_gif = allocateGifFile(size.cx, size.cy);
}
const SavedImageArray images(prArray, m_imageSettings.m_colorCount);
for(size_t i = 0; i < images.size(); i++) {
GifMakeSavedImage(m_gif, images[i]);
}
const SavedImage *image0 = images[0];
const ColorMapObject *colorMap = image0->ImageDesc.ColorMap;
m_gif->SColorMap = GifMakeMapObject(colorMap->ColorCount, colorMap->Colors);
updateTimestamp();
return true;
}
static void saveGif(ByteOutputStream &out, GifFileType *gf) {
int error;
GifFileType *gifOut = NULL;
try {
gifOut = EGifOpen(&out, writeGifStreamFunction, &error);
if(gifOut == NULL) {
THROWGIFERROR(error);
}
gifOut->SWidth = gf->SWidth;
gifOut->SHeight = gf->SHeight;
gifOut->SColorResolution = gf->SColorResolution;
gifOut->SBackGroundColor = gf->SBackGroundColor;
gifOut->SColorMap = GifMakeMapObject(gf->SColorMap->ColorCount
,gf->SColorMap->Colors);
for(int i = 0; i < gf->ImageCount; i++) {
GifMakeSavedImage(gifOut, &gf->SavedImages[i]);
}
if(gifOut->ImageCount > 0) {
SavedImage *image0 = gifOut->SavedImages;
addNetscapeBlock(image0);
}
EGifSetGifVersion(gifOut, true);
if(EGifSpew(gifOut) != GIF_OK) {
THROWGIFERROR(gifOut->Error);
}
} catch(Exception e) {
if(gifOut != NULL) {
EGifCloseFile(gifOut, &error);
}
throw e;
} catch(...) {
if(gifOut != NULL) {
EGifCloseFile(gifOut, &error);
}
throw;
}
}
void EncodeToGifBufferWorker::Execute () {
GifByteType
* redBuff = (GifByteType *) _pixbuf,
* greenBuff = (GifByteType *) _pixbuf + _width * _height,
* blueBuff = (GifByteType *) _pixbuf + 2 * _width * _height,
* alphaBuff = (GifByteType *) _pixbuf + 3 * _width * _height,
* gifimgbuf = (GifByteType *) malloc(_width * _height * sizeof(GifByteType)); // the indexed image
ColorMapObject *cmap;
SavedImage * simg;
if (NULL == gifimgbuf){
SetErrorMessage("Out of memory");
return;
}
cmap = GifMakeMapObject(_cmapSize, NULL);
if (NULL == cmap){
free(gifimgbuf);
SetErrorMessage("Out of memory");
return;
}
if (GIF_ERROR == GifQuantizeBuffer(
_width, _height, &_colors,
redBuff, greenBuff, blueBuff,
gifimgbuf, cmap->Colors
)){
free(gifimgbuf);
GifFreeMapObject(cmap);
SetErrorMessage("Unable to quantize image");
return;
}
int errcode;
gifWriteCbData buffinf = {NULL, 0};
GifFileType * gif;
gif = EGifOpen((void *) &buffinf, gifWriteCB, &errcode);
if (NULL == gif){
free(gifimgbuf);
GifFreeMapObject(cmap);
SetErrorMessage(GifErrorString(errcode));
return;
}
gif->SWidth = _width;
gif->SHeight = _height;
gif->SColorResolution = _cmapSize;
simg = GifMakeSavedImage(gif, NULL);
if (NULL == simg){
free(gifimgbuf);
EGifCloseFile(gif, &errcode); // will also free cmap
SetErrorMessage("Out of memory");
return;
}
simg->ImageDesc.Left = 0;
simg->ImageDesc.Top = 0;
simg->ImageDesc.Width = _width;
simg->ImageDesc.Height = _height;
simg->ImageDesc.Interlace = _interlaced;
simg->ImageDesc.ColorMap = cmap;
simg->RasterBits = gifimgbuf;
// for some reason giflib sometimes creates an invalid file if the global
// color table is not set as well
gif->SColorMap = cmap;
if (_trans){
ExtensionBlock ext;
// 1. assign transparent color index in color table
GraphicsControlBlock gcb = {0, false, 0, _colors++};
// 2. replace transparent pixels above threshold with this color
remapTransparentPixels(gifimgbuf, alphaBuff, _width, _height, gcb.TransparentColor, _threshold);
// 3. create a control block
size_t extlen = EGifGCBToExtension(&gcb, (GifByteType *) &ext);
if (GIF_ERROR == GifAddExtensionBlock(
&(simg->ExtensionBlockCount),
&(simg->ExtensionBlocks),
GRAPHICS_EXT_FUNC_CODE,
extlen,
(unsigned char *) &ext)
) {
EGifCloseFile(gif, &errcode);
SetErrorMessage("Out of memory");
return;
}
}
if (GIF_ERROR == EGifSpew(gif)){
EGifCloseFile(gif, &errcode);
SetErrorMessage(GifErrorString(gif->Error));
return;
}
_gifbuf = (char *) buffinf.buff;
_gifbufsize = buffinf.buffsize;
return;
}
