PixRectArray::PixRectArray(const StringArray &fileNames, StringArray &errors) {
USES_CONVERSION;
m_updateCounter = 0;
for(size_t i = 0; i < fileNames.size(); i++) {
const String &name = fileNames[i];
try {
if(FileNameSplitter(name).getExtension().equalsIgnoreCase(_T(".gif"))) {
int error;
const char *namea = T2A(name.cstr());
GifFileType *gifFile = DGifOpenFileName(namea, &error);
if(gifFile == NULL) {
throwException(_T("%s"), GifErrorString(error));
}
if(DGifSlurp(gifFile) != GIF_OK) {
const String msg = GifErrorString(gifFile->Error);
DGifCloseFile(gifFile, &error);
throwException(_T("%s"), msg.cstr());
}
const int imageCount = gifFile->ImageCount;
for(int k = 0; k < imageCount; k++) {
add(new GifPixRect(gifFile, k));
}
DGifCloseFile(gifFile, &error);
} else {
add(GifPixRect::load(name));
}
} catch(Exception e) {
errors.add(e.what());
}
}
}
int main(int argc, char **argv) {
argv++;
if(!*argv) usage();
int errorCode;
GifFileType *gifFile = DGifOpenFileName(*argv, &errorCode);
if(gifFile == NULL) {
printf("Error:%s\n", GifErrorString(errorCode));
exit(-1);
}
CHECKGIFOK(DGifSlurp(gifFile));
_tprintf(_T("GifFile:Size:(%d,%d)\n"), gifFile->SWidth, gifFile->SHeight);
_tprintf(_T("GifFile:BackgroundColor:%d, AspectByte:%d, ColorResultion:%d\n"), gifFile->SBackGroundColor, gifFile->AspectByte, gifFile->SColorResolution);
_tprintf(_T("GifFile ")); dumpImageDesc(gifFile->Image);
_tprintf(_T("GifFile:")); dumpColorMap(gifFile->SColorMap);
_tprintf(_T("GifFile.ExtentionBlocks:\n"));
dumpExtensionBlocks(gifFile->ExtensionBlocks, gifFile->ExtensionBlockCount);
for(int i = 0; i < gifFile->ImageCount; i++) {
dumpSavedImage(i, gifFile->SavedImages[i]);
}
if(DGifCloseFile(gifFile, &errorCode) != GIF_OK) {
CHECKGIFOK(errorCode);
}
return 0;
}
JNIEXPORT jlong JNICALL Java_com_ly_widget_GifDrawable_loadGifFile(JNIEnv * env, jobject obj, jstring filepath, jarray size)
{
int error;
const char *native_file_path = (*env)->GetStringUTFChars(env, filepath, 0);
GifFileType* gif = DGifOpenFileName(native_file_path,&error);
error = DGifSlurp(gif);
(*env)->ReleaseStringUTFChars(env, filepath, native_file_path);
return loadGif(env, gif, size);
}
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 compress_custom(void* input_data, InputFunc input_func,
void* output_data, OutputFunc output_func, int sample_size)
{
GifFileType* input_gif = NULL;
GifFileType* output_gif = NULL;
int result = GIF_ERROR;
// Check sample
if (sample_size <= 0) {
return false;
}
input_gif = DGifOpen(input_data, input_func, &error_code);
if (input_gif == NULL) {
LOGE(EMSG("Can't open input gif"));
return false;
}
DGifSlurp(input_gif);
if (input_gif->ImageCount == 0) {
LOGE(EMSG("Gif frame count is 0"));
DGifCloseFile(input_gif, &error_code);
return false;
}
// Save gif
output_gif = EGifOpen(output_data, output_func, &error_code);
if (output_gif == NULL) {
LOGE(EMSG("Can't open output gif"));
DGifCloseFile(input_gif, &error_code);
return false;
}
if (do_compress(input_gif, output_gif, sample_size)) {
result = EGifSpew(output_gif);
}
// Free
GifFreeExtensions(&output_gif->ExtensionBlockCount, &output_gif->ExtensionBlocks);
if (output_gif->SavedImages) {
GifFreeSavedImages(output_gif);
output_gif->SavedImages = NULL;
}
// Close gif
DGifCloseFile(input_gif, &error_code);
return result == GIF_OK;
}
SkGIFMovie::SkGIFMovie(SkStream* stream)
{
fGIF = DGifOpen( stream, Decode );
if (NULL == fGIF)
return;
if (DGifSlurp(fGIF) != GIF_OK)
{
DGifCloseFile(fGIF);
fGIF = NULL;
}
fCurrIndex = -1;
fLastDrawIndex = -1;
}
static GifFileType *loadGif(ByteInputStream &in) {
int error;
GifFileType *gf = DGifOpen(&in, readGifStreamFunction, &error);
if(gf == NULL) {
THROWGIFERROR(error);
}
try {
if(DGifSlurp(gf) != GIF_OK) {
THROWGIFERROR(gf->Error);
}
return gf;
} catch(...) {
DGifCloseFile(gf, &error);
throw;
}
}
void AnimatedImage::load(CWnd *parent, ByteInputStream &in) {
int error;
GifFileType *gifFile = DGifOpen(&in, readGifStreamFunction, &error);
if(gifFile == NULL) {
THROWGIFERROR(error);
}
try {
if(DGifSlurp(gifFile) != GIF_OK) {
THROWGIFERROR(gifFile->Error);
}
createFromGifFile(parent, gifFile);
DGifCloseFile(gifFile, &error);
} catch(...) {
DGifCloseFile(gifFile, &error);
throw;
}
}
static HRESULT WINAPI GifDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
WICDecodeOptions cacheOptions)
{
GifDecoder *This = (GifDecoder*)iface;
LARGE_INTEGER seek;
int ret;
TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
EnterCriticalSection(&This->lock);
if (This->initialized || This->gif)
{
WARN("already initialized\n");
LeaveCriticalSection(&This->lock);
return WINCODEC_ERR_WRONGSTATE;
}
/* seek to start of stream */
seek.QuadPart = 0;
IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
/* read all data from the stream */
This->gif = DGifOpen((void*)pIStream, _gif_inputfunc);
if (!This->gif)
{
LeaveCriticalSection(&This->lock);
return E_FAIL;
}
ret = DGifSlurp(This->gif);
if (ret == GIF_ERROR)
{
LeaveCriticalSection(&This->lock);
return E_FAIL;
}
/* make sure we don't use the stream after this method returns */
This->gif->UserData = NULL;
This->initialized = TRUE;
LeaveCriticalSection(&This->lock);
return S_OK;
}
SkGIFMovie::SkGIFMovie(SkStream* stream)
{
#if GIFLIB_MAJOR < 5
fGIF = DGifOpen( stream, Decode );
#else
fGIF = DGifOpen( stream, Decode, NULL );
#endif
if (NULL == fGIF)
return;
if (DGifSlurp(fGIF) != GIF_OK)
{
DGifCloseFile(fGIF);
fGIF = NULL;
}
fCurrIndex = -1;
fLastDrawIndex = -1;
}
static int read_gif_info(const ps_byte* data, size_t len, psx_image_header* header)
{
#if GIFLIB_MAJOR >= 5
int errorcode = 0;
#endif
struct gif_image_ctx* ctx = (struct gif_image_ctx*)calloc(1, sizeof(struct gif_image_ctx));
if (!ctx) {
return -1; // out of memory.
}
ctx->buf = (uint8_t*)data;
ctx->len = (uint32_t)len;
ctx->pos = 0;
#if GIFLIB_MAJOR >= 5
if ((ctx->gif = DGifOpen((void*)ctx, read_gif_from_memory, &errorcode)) == NULL) {
free(ctx);
return -1;
}
#else
if ((ctx->gif = DGifOpen((void*)ctx, read_gif_from_memory)) == NULL) {
free(ctx);
return -1;
}
#endif
if (GIF_OK != DGifSlurp(ctx->gif)) {
GIF_CLOSE_DFILE(ctx->gif);
free(ctx);
return -1;
}
header->priv = ctx;
header->width = ctx->gif->SWidth;
header->height = ctx->gif->SHeight;
header->pitch = ctx->gif->SWidth * 4;
header->depth = 32;
header->bpp = 4;
header->format = 0;
header->alpha = 1;
header->frames = ctx->gif->ImageCount;
return 0;
}
void init_gifs(char *fileName, int sizex, int sizey)
{
if(gifFileIn==NULL) {
gifFileIn = DGifOpenFileName("kaavyhdi.gif");
if(gifFileIn==NULL) {failExit;}
printf("%i,%i: %i\n", gifFileIn->SWidth, gifFileIn->SHeight, gifFileIn->SColorResolution);
if(DGifSlurp(gifFileIn) == GIF_ERROR) failExit;
printf("slurp done\n");
}
gifFileOut = EGifOpenFileName(fileName, FALSE);
if(gifFileOut==NULL) failExit;
printf("making output...\n");
if(EGifPutScreenDesc(gifFileOut, sizex, sizey, gifFileIn->SColorResolution,
gifFileIn->SBackGroundColor,
MakeMapObject(gifFileIn->SColorMap->ColorCount,
gifFileIn->SColorMap->Colors)) == GIF_ERROR) failExit;
if(EGifPutImageDesc(gifFileOut, 0, 0, sizex, sizey, FALSE, NULL) == GIF_ERROR) failExit;
}
JNIEXPORT jlong JNICALL Java_com_ly_widget_GifDrawable_loadGifAsset(JNIEnv * env, jobject obj, jobject assetManager, jstring filepath, jarray size)
{
int error;
AAssetManager *mgr = AAssetManager_fromJava(env, assetManager);
const char *native_file_path = (*env)->GetStringUTFChars(env, filepath, 0);
AAsset* asset = AAssetManager_open(mgr, native_file_path, AASSET_MODE_UNKNOWN);
off_t start, length;
fd = AAsset_openFileDescriptor(asset, &start, &length);
bytesLeft = length;
lseek(fd, start, SEEK_SET);
if (fd < 0) {
return 0;
}
GifFileType* gif = DGifOpen(NULL,&readFunc,&error);
error = DGifSlurp(gif);
(*env)->ReleaseStringUTFChars(env, filepath, native_file_path);
AAsset_close(asset);
return loadGif(env, gif, size);
}
bool GIFMovie::init(FILE* file)
{
if(file == NULL)
{
return false;
}
int error = 0;
fGIF = DGifOpen(file,&DecodeCallBackProc,&error);
if (NULL == fGIF || DGifSlurp(fGIF) != GIF_OK)
{
GifUtils::closeFile(file);
DGifCloseFile(fGIF);
fGIF = NULL;
return false;
}
GifUtils::closeFile(file);
return true;
}
int openStream(GifFileType* gifFileType,JNIEnv * env,jobject stream)
{
jclass streamCls = (jclass)env->NewGlobalRef(env->GetObjectClass(stream));
jmethodID mid = env->GetMethodID(streamCls, "mark", "(I)V");
jmethodID readMID = env->GetMethodID(streamCls, "read", "([BII)I");
jmethodID resetMID = env->GetMethodID(streamCls, "reset", "()V");
if (mid == 0 || readMID == 0 || resetMID == 0)
{
env->DeleteGlobalRef(streamCls);
return (jint) NULL;
}
StreamContainer* container = (StreamContainer*)malloc(sizeof(StreamContainer));
if (container == NULL)
{
return (jint) NULL;
}
container->readMID = readMID;
container->resetMID = resetMID;
container->stream = env->NewGlobalRef(stream);
container->streamCls = streamCls;
container->buffer = NULL;
container->env = env;
int Error = 0;
gifType = DGifOpen(container, &streamReadFun);
if(gifType == NULL){
return GIF_ERROR;
}else{
}
if(DGifSlurp(gifType) == GIF_ERROR){
return GIF_ERROR;
}
return GIF_OK;
}
GDALDataset *GIFDataset::Open( GDALOpenInfo * poOpenInfo )
{
if( !Identify( poOpenInfo ) )
return NULL;
if( poOpenInfo->eAccess == GA_Update )
{
CPLError( CE_Failure, CPLE_NotSupported,
"The GIF driver does not support update access to existing"
" files.\n" );
return NULL;
}
/* -------------------------------------------------------------------- */
/* Open the file and ingest. */
/* -------------------------------------------------------------------- */
GifFileType *hGifFile;
VSILFILE *fp;
int nGifErr;
fp = VSIFOpenL( poOpenInfo->pszFilename, "r" );
if( fp == NULL )
return NULL;
hGifFile = GIFAbstractDataset::myDGifOpen( fp, VSIGIFReadFunc );
if( hGifFile == NULL )
{
VSIFCloseL( fp );
CPLError( CE_Failure, CPLE_OpenFailed,
"DGifOpen() failed for %s.\n"
"Perhaps the gif file is corrupt?\n",
poOpenInfo->pszFilename );
return NULL;
}
/* The following code enables us to detect GIF datasets eligible */
/* for BIGGIF driver even with an unpatched giflib */
/* -------------------------------------------------------------------- */
/* Find the first image record. */
/* -------------------------------------------------------------------- */
GifRecordType RecordType = TERMINATE_RECORD_TYPE;
while( DGifGetRecordType(hGifFile, &RecordType) != GIF_ERROR
&& RecordType != TERMINATE_RECORD_TYPE
&& RecordType != IMAGE_DESC_RECORD_TYPE )
{
/* Skip extension records found before IMAGE_DESC_RECORD_TYPE */
if (RecordType == EXTENSION_RECORD_TYPE)
{
int nFunction;
GifByteType *pExtData;
if (DGifGetExtension(hGifFile, &nFunction, &pExtData) == GIF_ERROR)
break;
while (pExtData != NULL)
{
if (DGifGetExtensionNext(hGifFile, &pExtData) == GIF_ERROR)
break;
}
}
}
if( RecordType == IMAGE_DESC_RECORD_TYPE &&
DGifGetImageDesc(hGifFile) != GIF_ERROR)
{
int width = hGifFile->SavedImages[0].ImageDesc.Width;
int height = hGifFile->SavedImages[0].ImageDesc.Height;
if ((double) width * (double) height > 100000000.0 )
{
CPLDebug( "GIF",
"Due to limitations of the GDAL GIF driver we deliberately avoid\n"
"opening large GIF files (larger than 100 megapixels).");
GIFAbstractDataset::myDGifCloseFile( hGifFile );
VSIFCloseL( fp );
return NULL;
}
}
GIFAbstractDataset::myDGifCloseFile( hGifFile );
VSIFSeekL( fp, 0, SEEK_SET);
hGifFile = GIFAbstractDataset::myDGifOpen( fp, VSIGIFReadFunc );
if( hGifFile == NULL )
{
VSIFCloseL( fp );
CPLError( CE_Failure, CPLE_OpenFailed,
"DGifOpen() failed for %s.\n"
"Perhaps the gif file is corrupt?\n",
poOpenInfo->pszFilename );
return NULL;
}
nGifErr = DGifSlurp( hGifFile );
if( nGifErr != GIF_OK || hGifFile->SavedImages == NULL )
{
VSIFCloseL( fp );
GIFAbstractDataset::myDGifCloseFile(hGifFile);
if( nGifErr == D_GIF_ERR_DATA_TOO_BIG )
{
CPLDebug( "GIF",
"DGifSlurp() failed for %s because it was too large.\n"
"Due to limitations of the GDAL GIF driver we deliberately avoid\n"
"opening large GIF files (larger than 100 megapixels).",
poOpenInfo->pszFilename );
return NULL;
}
else
CPLError( CE_Failure, CPLE_OpenFailed,
"DGifSlurp() failed for %s.\n"
"Perhaps the gif file is corrupt?\n",
poOpenInfo->pszFilename );
return NULL;
}
/* -------------------------------------------------------------------- */
/* Create a corresponding GDALDataset. */
/* -------------------------------------------------------------------- */
GIFDataset *poDS;
poDS = new GIFDataset();
poDS->fp = fp;
poDS->eAccess = GA_ReadOnly;
poDS->hGifFile = hGifFile;
/* -------------------------------------------------------------------- */
/* Capture some information from the file that is of interest. */
/* -------------------------------------------------------------------- */
poDS->nRasterXSize = hGifFile->SavedImages[0].ImageDesc.Width;
poDS->nRasterYSize = hGifFile->SavedImages[0].ImageDesc.Height;
/* -------------------------------------------------------------------- */
/* Create band information objects. */
/* -------------------------------------------------------------------- */
for( int iImage = 0; iImage < hGifFile->ImageCount; iImage++ )
{
SavedImage *psImage = hGifFile->SavedImages + iImage;
if( psImage->ImageDesc.Width != poDS->nRasterXSize
|| psImage->ImageDesc.Height != poDS->nRasterYSize )
continue;
poDS->SetBand( poDS->nBands+1,
new GIFRasterBand( poDS, poDS->nBands+1, psImage,
hGifFile->SBackGroundColor ));
}
/* -------------------------------------------------------------------- */
/* Check for georeferencing. */
/* -------------------------------------------------------------------- */
poDS->DetectGeoreferencing(poOpenInfo);
/* -------------------------------------------------------------------- */
/* Initialize any PAM information. */
/* -------------------------------------------------------------------- */
poDS->SetDescription( poOpenInfo->pszFilename );
poDS->TryLoadXML();
/* -------------------------------------------------------------------- */
/* Support overviews. */
/* -------------------------------------------------------------------- */
poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename );
return poDS;
}
void *
gifconv_gif2lossless(unsigned char *gif_data, unsigned long gif_data_len,
int *tag_no, int *format,
unsigned short *width, unsigned short *height,
void **colormap, int *colormap_count) {
GifFileType *GifFile = NULL;
ColorMapObject *ColorMap = NULL;
my_gif_buffer gif_buff;
int bpp;
gif_uint_32 gif_width = 0, gif_height = 0;
gif_bytep gif_image_data_ref = NULL;
gif_uint_32 x, y;
void *image_data = NULL;
int palette_num = 0;
int trans_index = -1;
SavedImage Image;
int i, j;
unsigned char *indices_data;
gif_buff.data = gif_data;
gif_buff.data_len = gif_data_len;
gif_buff.data_offset = 0;
#if GIFLIB_MAJOR >= 5
GifFile = DGifOpen(& gif_buff, gif_data_read_func, NULL);
#else
GifFile = DGifOpen(& gif_buff, gif_data_read_func);
#endif
if (GifFile == NULL) {
fprintf(stderr, "gifconv_gif2lossless: can't open GIFFile\n");
return NULL;
}
if (DGifSlurp(GifFile) == GIF_ERROR) {
fprintf(stderr, "gifconv_gif2lossless: DGifSlurp failed\n");
#if GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1 || GIFLIB_MAJOR > 5
DGifCloseFile(GifFile, NULL);
#else
DGifCloseFile(GifFile);
#endif
return NULL;
}
Image = GifFile->SavedImages[0];
ColorMap = GifFile->SColorMap;
if (ColorMap == NULL) {
ColorMap = Image.ImageDesc.ColorMap;
}
gif_width = GifFile->SWidth;
gif_height = GifFile->SHeight;
bpp = ColorMap->BitsPerPixel;
if (bpp > 8) {
fprintf(stderr, "gifconv_gif2lossless: bpp=%d not implemented. accept only bpp <= 8\n", bpp);
#if GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1 || GIFLIB_MAJOR > 5
DGifCloseFile(GifFile, NULL);
#else
DGifCloseFile(GifFile);
#endif
return NULL;
}
palette_num = ColorMap->ColorCount;
trans_index = getTransparentIndex(Image);
*width = (unsigned short) gif_width;
*height = (unsigned short) gif_height;
*format = 3;
if (trans_index != -1) {
*tag_no = 36; // DefineBitsLossless2
} else {
*tag_no = 20; // DefineBitsLossless
}
/*
* image copy
*/
*colormap_count = palette_num;
if (trans_index == -1) { // Lossless
swf_rgb_t *result_colormap = malloc(sizeof(swf_rgb_t) * palette_num);
for (i=0 ; i < palette_num ; i++) {
result_colormap[i].red = ColorMap->Colors[i].Red;
result_colormap[i].green = ColorMap->Colors[i].Green;
result_colormap[i].blue = ColorMap->Colors[i].Blue;
}
*colormap = result_colormap;
} else { // Lossless2
swf_rgba_t *result_colormap = malloc(sizeof(swf_rgba_t) * palette_num);
for (i=0 ; i < palette_num ; i++) {
if (i == trans_index) {
result_colormap[i].red = 0x0;
result_colormap[i].green = 0x0;
result_colormap[i].blue = 0x0;
result_colormap[i].alpha = 0x0;
} else {
result_colormap[i].red = ColorMap->Colors[i].Red;
result_colormap[i].green = ColorMap->Colors[i].Green;
result_colormap[i].blue = ColorMap->Colors[i].Blue;
result_colormap[i].alpha = 0xff;
}
}
*colormap = result_colormap;
}
indices_data = malloc(((gif_width+ 3) & -4) * gif_height);
gif_image_data_ref = Image.RasterBits;
i = 0;
j = 0;
for (y=0 ; y < gif_height ; y++) {
for (x=0 ; x < gif_width ; x++) {
indices_data[i] = gif_image_data_ref[j];
i++;
j++;
}
while (i % 4) { i++; } // 4byte alignment
}
image_data = indices_data;
/*
* destruct
*/
if (GifFile) {
#if GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1 || GIFLIB_MAJOR > 5
DGifCloseFile(GifFile, NULL);
#else
DGifCloseFile(GifFile);
#endif
}
return image_data;
}
//=================================================================================
// bind_gif
//=================================================================================
static void bind_gif(struct QDRBindImage *b, const char *file)
{
GifFileType *gif;
SavedImage g;
ColorMapObject *colormap;
unsigned char trans[256];
int i, j, s, t;
gif = DGifOpenFileName(file);
if(!gif)
return;
if(DGifSlurp(gif) == GIF_ERROR)
return;
//アニメーションGIFの場合でも、1枚目の画像のみ使う
g = gif->SavedImages[0];
if(g.ImageDesc.Left + g.ImageDesc.Width > gif->SWidth || g.ImageDesc.Top + g.ImageDesc.Height > gif->SHeight){
DGifCloseFile(gif);
return;
}
//カラーマップ
colormap = g.ImageDesc.ColorMap;
if(!colormap)
colormap = gif->SColorMap;
//透過情報の取得
memset(trans, 0, 256);
if(g.ExtensionBlockCount!=0 && g.ExtensionBlocks){
ExtensionBlock *block;
for(i=0; i<g.ExtensionBlockCount; i++){
block = &(g.ExtensionBlocks[i]);
if(block->Function == GRAPHICS_EXT_FUNC_CODE){
if(block->Bytes[0] & 0x01)
trans[(int)block->Bytes[3]] = 1;
}
}
}
//イメージを格納する領域
b->width = g.ImageDesc.Width;
b->height = g.ImageDesc.Height;
b->data = malloc(b->height * b->width * 4);
if(g.ImageDesc.Interlace){
int ifset[4] = { 0, 4, 2, 1 }; //InterlacedOffset
int jumps[4] = { 8, 8, 4, 2 }; //InterlacedJumps
i=0;
for(t=0; t<4; t++){
for(s=ifset[t]; s<b->height; s+=jumps[t]){
for(j=0; j<b->width; j++){
if(trans[g.RasterBits[i*b->width+j]]){
memset(&b->data[(s*b->width+j)*4], 0, 4);
}else{
//RGB -> BGRA
GifColorType *ColorMapEntry = &colormap->Colors[g.RasterBits[i*b->width+j]];
b->data[(s*b->width+j)*4 ] = ColorMapEntry->Blue;
b->data[(s*b->width+j)*4+1] = ColorMapEntry->Green;
b->data[(s*b->width+j)*4+2] = ColorMapEntry->Red;
b->data[(s*b->width+j)*4+3] = 0xff;
}
}
i++;
}
}
}else{
for(i=0; i<b->height; i++){
for(j=0; j<b->width; j++){
if(trans[g.RasterBits[i*b->width+j]]){
memset(&b->data[(i*b->width+j)*4], 0, 4);
}else{
//RGB -> BGRA
GifColorType *ColorMapEntry = &colormap->Colors[g.RasterBits[i*b->width+j]];
b->data[(i*b->width+j)*4 ] = ColorMapEntry->Blue;
b->data[(i*b->width+j)*4+1] = ColorMapEntry->Green;
b->data[(i*b->width+j)*4+2] = ColorMapEntry->Red;
b->data[(i*b->width+j)*4+3] = 0xff;
}
}
}
}
DGifCloseFile(gif);
}
bool MCGIFImageLoader::LoadFrames(MCBitmapFrame *&r_frames, uint32_t &r_count)
{
bool t_success;
t_success = true;
MCImageBitmap *t_canvas;
t_canvas = nil;
// restoration info
MCImageBitmap *t_restore_image = nil;
int t_disposal_mode = DISPOSAL_UNSPECIFIED;
MCRectangle t_disposal_region = kMCEmptyRectangle;
// The list of frames.
MCBitmapFrame *t_frames = nil;
t_success = GIF_OK == DGifSlurp(m_gif);
// Fetch the width and height of the virtual canvas.
int32_t t_width, t_height;
if (t_success)
{
t_width = m_gif -> SWidth;
t_height = m_gif -> SHeight;
// create the canvas image
t_success = MCImageBitmapCreate(t_width, t_height, t_canvas);
}
// The current frame count. The number of frames is the same as the
// number of images in the GIF.
uint32_t t_frame_count;
t_frame_count = 0;
// If true, the new image will be merged with the old - otherwise the mask
// replaces it.
bool t_overlay;
t_overlay = false;
// Loop through all the images, making frames as we go.
for(uindex_t i = 0; t_success && i < m_gif -> ImageCount; i++)
{
// Process the disposal.
switch (t_disposal_mode)
{
case DISPOSE_BACKGROUND:
gif_fill_image_region(t_canvas, t_disposal_region, 0);
break;
case DISPOSE_PREVIOUS:
if (t_restore_image != nil)
gif_paste_image(t_canvas, t_restore_image, t_disposal_region.x, t_disposal_region.y);
break;
case DISPOSE_DO_NOT:
t_overlay = true;
break;
default:
t_overlay = false;
break;
}
// Fetch the image information.
GraphicsControlBlock t_image_gcb;
MCRectangle t_image_region;
ColorMapObject *t_image_colors = nil;
int32_t t_image_transparency;
int32_t t_image_delay;
int32_t t_image_disposal;
GifByteType *t_image_raster;
// First the information from the image description.
t_image_region.x = m_gif -> SavedImages[i] . ImageDesc . Left;
t_image_region.y = m_gif -> SavedImages[i] . ImageDesc . Top;
t_image_region.width = m_gif -> SavedImages[i] . ImageDesc . Width;
t_image_region.height = m_gif -> SavedImages[i] . ImageDesc . Height;
t_image_colors = m_gif -> SavedImages[i] . ImageDesc . ColorMap;
t_image_raster = m_gif -> SavedImages[i] . RasterBits;
if (t_image_colors == nil)
t_image_colors = m_gif -> SColorMap;
// Then the information from the GCB.
if (GIF_OK == DGifSavedExtensionToGCB(m_gif, i, &t_image_gcb))
{
t_image_transparency = t_image_gcb . TransparentColor;
t_image_delay = t_image_gcb . DelayTime;
t_image_disposal = t_image_gcb . DisposalMode;
}
else
{
t_image_transparency = -1;
t_image_delay = 0;
t_image_disposal = DISPOSAL_UNSPECIFIED;
}
// If disposal is 'previous' then cache the portion of the canvas we are
// about to affect.
if (t_image_disposal == DISPOSE_PREVIOUS)
{
if (t_restore_image != nil)
{
if (t_disposal_mode != DISPOSE_PREVIOUS ||
!MCU_equal_rect(t_disposal_region, t_image_region))
{
MCImageFreeBitmap(t_restore_image);
t_restore_image = nil;
}
}
if (t_restore_image == nil)
t_success = MCImageCopyBitmapRegion(t_canvas, t_image_region, t_restore_image);
}
if (t_success)
{
// Render the image into the canvas.
gif_draw_image_into_canvas(t_canvas, t_image_raster,
t_image_region.x, t_image_region.y, t_image_region.width, t_image_region.height,
t_image_colors, t_image_transparency, t_overlay);
// Generate our frame.
t_success = MCMemoryResizeArray(t_frame_count + 1, t_frames, t_frame_count);
}
MCImageBitmap *t_frame_bitmap = nil;
if (t_success)
t_success = MCImageCopyBitmap(t_canvas, t_frame_bitmap);
if (t_success)
{
MCImageBitmapCheckTransparency(t_frame_bitmap);
t_frames[t_frame_count - 1].image = t_frame_bitmap;
t_frames[t_frame_count - 1].duration = t_image_delay * 10; // convert 1/100 seconds to milliseconds
t_frames[t_frame_count - 1].x_scale = t_frames[t_frame_count - 1].y_scale = 1.0;
}
t_disposal_region = t_image_region;
t_disposal_mode = t_image_disposal;
}
MCImageFreeBitmap(t_canvas);
MCImageFreeBitmap(t_restore_image);
if (t_success)
{
r_frames = t_frames;
r_count = t_frame_count;
}
else
MCImageFreeFrames(t_frames, t_frame_count);
return t_success;
}
bool nglImageGIFCodec::Feed(nglIStream* pIStream)
{
GifFileType* pGIF = DGifOpen(pIStream, &GIFInputFunc);
if (!pGIF)
return false;
if (DGifSlurp(pGIF) != GIF_OK)
return false;
nglImageInfo info(pGIF->SWidth, pGIF->SHeight, 32);
if (!SendInfo(info))
{
DGifCloseFile(pGIF);
return false;
}
GifImageDesc* pImg = &pGIF->SavedImages[0].ImageDesc;
// Local colormap has precedence over Global colormap
ColorMapObject* pColormap = pImg->ColorMap ? pImg->ColorMap : pGIF->SColorMap;
uint32 numcolors = pColormap->ColorCount;
uint32 alphapalette = getTransparentColor(pGIF, 0);
uint32 bgcolor = -1;
// bgcolor is the background color to fill the bitmap
if (pGIF->SColorMap) // There is a GlobalColorMap
bgcolor = (uint8)pGIF->SBackGroundColor; // The SBGColor is meaningful
else if (alphapalette >= 0) // There is a transparency color
bgcolor = alphapalette; // set the bgcolor to tranparent
else
bgcolor = 0;
// Don't know what to do here.
// If this doesn't work, we could
// create a new color and set the
// alpha-channel to transparent
// (unless we are using all the 256
// colors, in which case either we
// give up, or move to 16-bits palette
uint32 palette[256];
for (uint32 i = 0; i < numcolors; i++)
{
uint8 alpha = 255;
if (i == bgcolor || i == alphapalette)
alpha = 0;
nuiColor c(pColormap->Colors[i].Red, pColormap->Colors[i].Green, pColormap->Colors[i].Blue, alpha);
palette[i] = c.GetRGBA();
}
uint32* pOutBuf = (uint32*)mpImage->GetBuffer();
uint8* pInBuf = (uint8*)(pGIF->SavedImages[0].RasterBits);
for (uint32 i = 0; i < pGIF->SWidth * pGIF->SHeight; i++)
*pOutBuf++ = palette[*pInBuf++];
SendData(1.0f);
DGifCloseFile(pGIF);
return true;
}
static void Icon2Gif(char *FileName, FILE *txtin, int fdout)
{
unsigned int ExtCode, ColorMapSize = 0;
GifColorType GlobalColorMap[256], LocalColorMap[256],
*ColorMap = GlobalColorMap;
char GlobalColorKeys[PRINTABLES], LocalColorKeys[PRINTABLES],
*KeyTable = GlobalColorKeys;
int red, green, blue;
char buf[BUFSIZ * 2], InclusionFile[64];
GifFileType *GifFileOut;
SavedImage *NewImage = NULL;
int n, LineNum = 0;
if ((GifFileOut = EGifOpenFileHandle(fdout)) == NULL) {
(void) HandleGifError(GifFileOut);
}
/* OK, interpret directives */
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL)
{
char *cp;
++LineNum;
/*
* Skip lines consisting only of whitespace and comments
*/
for (cp = buf; isspace((int)(*cp)); cp++)
continue;
if (*cp == '#' || *cp == '\0')
continue;
/*
* If there's a trailing comment, nuke it and all preceding whitespace.
* But preserve the EOL.
*/
if ((cp = strchr(buf, '#')) && (cp == strrchr(cp, '#')))
{
while (isspace((int)(*--cp)))
continue;
*++cp = '\n';
*++cp = '\0';
}
/*
* Explicit header declarations
*/
if (sscanf(buf, "screen width %d\n", &GifFileOut->SWidth) == 1)
continue;
else if (sscanf(buf, "screen height %d\n", &GifFileOut->SHeight) == 1)
continue;
else if (sscanf(buf, "screen colors %d\n", &n) == 1)
{
int ResBits = BitSize(n);
if (n > 256 || n < 0 || n != (1 << ResBits))
{
PARSE_ERROR("Invalid color resolution value.");
exit(EXIT_FAILURE);
}
GifFileOut->SColorResolution = ResBits;
continue;
}
else if (sscanf(buf,
"screen background %d\n",
&GifFileOut->SBackGroundColor) == 1)
continue;
/*
* Color table parsing
*/
else if (strcmp(buf, "screen map\n") == 0)
{
if (GifFileOut->SColorMap != NULL)
{
PARSE_ERROR("You've already declared a global color map.");
exit(EXIT_FAILURE);
}
ColorMapSize = 0;
ColorMap = GlobalColorMap;
KeyTable = GlobalColorKeys;
memset(GlobalColorKeys, '\0', sizeof(GlobalColorKeys));
}
else if (strcmp(buf, "image map\n") == 0)
{
if (NewImage == NULL)
{
PARSE_ERROR("No previous image declaration.");
exit(EXIT_FAILURE);
}
ColorMapSize = 0;
ColorMap = LocalColorMap;
KeyTable = LocalColorKeys;
memset(LocalColorKeys, '\0', sizeof(LocalColorKeys));
}
else if (sscanf(buf, " rgb %d %d %d is %c",
&red, &green, &blue, &KeyTable[ColorMapSize]) == 4)
{
ColorMap[ColorMapSize].Red = red;
ColorMap[ColorMapSize].Green = green;
ColorMap[ColorMapSize].Blue = blue;
ColorMapSize++;
}
else if (strcmp(buf, "end\n") == 0)
{
ColorMapObject *NewMap;
NewMap = MakeMapObject(1 << BitSize(ColorMapSize), ColorMap);
if (NewMap == (ColorMapObject *)NULL)
{
PARSE_ERROR("Out of memory while allocating new color map.");
exit(EXIT_FAILURE);
}
if (NewImage)
NewImage->ImageDesc.ColorMap = NewMap;
else
GifFileOut->SColorMap = NewMap;
}
/* GIF inclusion */
else if (sscanf(buf, "include %s", InclusionFile) == 1)
{
GifBooleanType DoTranslation;
GifPixelType Translation[256];
GifFileType *Inclusion;
SavedImage *NewImage, *CopyFrom;
if ((Inclusion = DGifOpenFileName(InclusionFile)) == NULL
|| DGifSlurp(Inclusion) == GIF_ERROR)
{
PARSE_ERROR("Inclusion read failed.");
QuitGifError(Inclusion, GifFileOut);
}
if ((DoTranslation = (GifFileOut->SColorMap!=(ColorMapObject*)NULL)))
{
ColorMapObject *UnionMap;
UnionMap = UnionColorMap(GifFileOut->SColorMap,
Inclusion->SColorMap, Translation);
if (UnionMap == NULL)
{
PARSE_ERROR("Inclusion failed --- global map conflict.");
QuitGifError(Inclusion, GifFileOut);
}
FreeMapObject(GifFileOut->SColorMap);
GifFileOut->SColorMap = UnionMap;
}
for (CopyFrom = Inclusion->SavedImages;
CopyFrom < Inclusion->SavedImages + Inclusion->ImageCount;
CopyFrom++)
{
if ((NewImage = MakeSavedImage(GifFileOut, CopyFrom)) == NULL)
{
PARSE_ERROR("Inclusion failed --- out of memory.");
QuitGifError(Inclusion, GifFileOut);
}
else if (DoTranslation)
ApplyTranslation(NewImage, Translation);
GifQprintf(
"%s: Image %d at (%d, %d) [%dx%d]: from %s\n",
PROGRAM_NAME, GifFileOut->ImageCount,
NewImage->ImageDesc.Left, NewImage->ImageDesc.Top,
NewImage->ImageDesc.Width, NewImage->ImageDesc.Height,
InclusionFile);
}
(void) DGifCloseFile(Inclusion);
}
/*
* Explicit image declarations
*/
else if (strcmp(buf, "image\n") == 0)
{
if ((NewImage = MakeSavedImage(GifFileOut, NULL)) == (SavedImage *)NULL)
{
PARSE_ERROR("Out of memory while allocating image block.");
exit(EXIT_FAILURE);
}
/* use global table unless user specifies a local one */
ColorMap = GlobalColorMap;
KeyTable = GlobalColorKeys;
}
/*
* Nothing past this point is valid unless we've seen a previous
* image declaration.
*/
else if (NewImage == (SavedImage *)NULL)
{
(void) fputs(buf, stderr);
PARSE_ERROR("Syntax error in header block.");
exit(EXIT_FAILURE);
}
/*
* Accept image attributes
*/
else if (sscanf(buf, "image top %d\n", &NewImage->ImageDesc.Top) == 1)
continue;
else if (sscanf(buf, "image left %d\n", &NewImage->ImageDesc.Left)== 1)
continue;
else if (strcmp(buf, "image interlaced\n") == 0)
{
NewImage->ImageDesc.Interlace = TRUE;
continue;
}
else if (sscanf(buf,
"image bits %d by %d\n",
&NewImage->ImageDesc.Width,
&NewImage->ImageDesc.Height) == 2)
{
int i, j;
static GifPixelType *Raster, *cp;
int c;
if ((Raster = (GifPixelType *) malloc(sizeof(GifPixelType) * NewImage->ImageDesc.Width * NewImage->ImageDesc.Height))
== NULL) {
PARSE_ERROR("Failed to allocate raster block, aborted.");
exit(EXIT_FAILURE);
}
if (!GifQuietPrint)
fprintf(stderr, "%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, GifFileOut->ImageCount,
NewImage->ImageDesc.Left, NewImage->ImageDesc.Top,
NewImage->ImageDesc.Width, NewImage->ImageDesc.Height);
cp = Raster;
for (i = 0; i < NewImage->ImageDesc.Height; i++) {
char *dp;
for (j = 0; j < NewImage->ImageDesc.Width; j++)
if ((c = fgetc(txtin)) == EOF) {
PARSE_ERROR("input file ended prematurely.");
exit(EXIT_FAILURE);
}
else if (c == '\n')
{
--j;
++LineNum;
}
else if (isspace(c))
--j;
else if ((dp = strchr(KeyTable, c)))
*cp++ = (dp - KeyTable);
else {
PARSE_ERROR("Invalid pixel value.");
exit(EXIT_FAILURE);
}
if (!GifQuietPrint)
fprintf(stderr, "\b\b\b\b%-4d", i);
}
if (!GifQuietPrint)
putc('\n', stderr);
NewImage->RasterBits = (unsigned char *) Raster;
}
else if (sscanf(buf, "comment"))
{
MakeExtension(NewImage, COMMENT_EXT_FUNC_CODE);
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL)
if (strcmp(buf, "end\n") == 0)
break;
else
{
int Len;
buf[strlen(buf) - 1] = '\0';
Len = EscapeString(buf, buf);
if (AddExtensionBlock(NewImage, Len, (unsigned char *)buf) == GIF_ERROR) {
PARSE_ERROR("out of memory while adding comment block.");
exit(EXIT_FAILURE);
}
}
}
else if (sscanf(buf, "plaintext"))
{
MakeExtension(NewImage, PLAINTEXT_EXT_FUNC_CODE);
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL)
if (strcmp(buf, "end\n") == 0)
break;
else
{
int Len;
buf[strlen(buf) - 1] = '\0';
Len = EscapeString(buf, buf);
if (AddExtensionBlock(NewImage, Len, (unsigned char *)buf) == GIF_ERROR) {
PARSE_ERROR("out of memory while adding plaintext block.");
exit(EXIT_FAILURE);
}
}
}
else if (sscanf(buf, "extension %02x", &ExtCode))
{
MakeExtension(NewImage, ExtCode);
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL)
if (strcmp(buf, "end\n") == 0)
break;
else
{
int Len;
buf[strlen(buf) - 1] = '\0';
Len = EscapeString(buf, buf);
if (AddExtensionBlock(NewImage, Len, (unsigned char *)buf) == GIF_ERROR) {
PARSE_ERROR("out of memory while adding extension block.");
exit(EXIT_FAILURE);
}
}
}
else
{
(void) fputs(buf, stderr);
PARSE_ERROR("Syntax error in image description.");
exit(EXIT_FAILURE);
}
}
if (EGifSpew(GifFileOut) == GIF_ERROR)
HandleGifError(GifFileOut);
}
int main (int argc, char **argv)
{
// inverse flag
int rflag = 0, mflag = 0, cflag = 0, ch;
while ((ch = getopt (argc, argv, "rmc")) != -1)
{
switch (ch)
{
case 'r':
rflag = 1;
break;
case 'm':
mflag = 1;
break;
case 'c':
cflag = 1;
break;
default:
// print error and exit
usage ();
return 1;
}
}
// adjust args array post-getopt
argc -= optind;
argv += optind;
if (argv[0] == NULL)
{
// print error and exit
fputs ("File name missing\n", stderr);
usage ();
return 1;
}
char *fname = argv[0];
// open the GIF file
GifFileType *SpriteGif;
SpriteGif = DGifOpenFileName (fname);
// check for error
if (SpriteGif == NULL)
{
// print error and exit
PrintGifError ();
exit (1);
}
if (DGifSlurp (SpriteGif) == GIF_ERROR)
{
// print error and exit
PrintGifError ();
exit (1);
}
int rc; // return code
if (cflag && mflag)
{
rc = DecodeMultiColorCharacterGraphics (SpriteGif);
}
else if (cflag)
{
rc = DecodeHiResCharacterGraphics (SpriteGif);
}
else if (mflag)
{
rc = DecodeMultiColorSpriteGraphics (SpriteGif);
}
else
{
rc = DecodeHiResSpriteGraphics (SpriteGif, rflag);
}
// close the file object
if (DGifCloseFile (SpriteGif) == GIF_ERROR)
{
// print error and exit
PrintGifError ();
return 1;
}
return rc;
}
/*!
* \brief gifToPix()
*
* \param[in] gif opened gif stream
* \return pix, or NULL on error
*
* <pre>
* Notes:
* (1) This decodes the pix from the compressed gif stream and
* closes the stream.
* (2) It is static so that the stream is not exposed to clients.
* </pre>
*/
static PIX *
gifToPix(GifFileType *gif)
{
l_int32 wpl, i, j, w, h, d, cindex, ncolors;
l_int32 rval, gval, bval;
l_uint32 *data, *line;
PIX *pixd, *pixdi;
PIXCMAP *cmap;
ColorMapObject *gif_cmap;
SavedImage si;
#if (GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1) || GIFLIB_MAJOR > 5
int giferr;
#endif /* 5.1 and beyond */
PROCNAME("gifToPix");
/* Read all the data, but use only the first image found */
if (DGifSlurp(gif) != GIF_OK) {
DGifCloseFile(gif, &giferr);
return (PIX *)ERROR_PTR("failed to read GIF data", procName, NULL);
}
if (gif->SavedImages == NULL) {
DGifCloseFile(gif, &giferr);
return (PIX *)ERROR_PTR("no images found in GIF", procName, NULL);
}
si = gif->SavedImages[0];
w = si.ImageDesc.Width;
h = si.ImageDesc.Height;
if (w <= 0 || h <= 0) {
DGifCloseFile(gif, &giferr);
return (PIX *)ERROR_PTR("invalid image dimensions", procName, NULL);
}
if (si.RasterBits == NULL) {
DGifCloseFile(gif, &giferr);
return (PIX *)ERROR_PTR("no raster data in GIF", procName, NULL);
}
if (si.ImageDesc.ColorMap) {
/* private cmap for this image */
gif_cmap = si.ImageDesc.ColorMap;
} else if (gif->SColorMap) {
/* global cmap for whole picture */
gif_cmap = gif->SColorMap;
} else {
/* don't know where to take cmap from */
DGifCloseFile(gif, &giferr);
return (PIX *)ERROR_PTR("color map is missing", procName, NULL);
}
ncolors = gif_cmap->ColorCount;
if (ncolors <= 2)
d = 1;
else if (ncolors <= 4)
d = 2;
else if (ncolors <= 16)
d = 4;
else
d = 8;
if ((cmap = pixcmapCreate(d)) == NULL) {
DGifCloseFile(gif, &giferr);
return (PIX *)ERROR_PTR("cmap creation failed", procName, NULL);
}
for (cindex = 0; cindex < ncolors; cindex++) {
rval = gif_cmap->Colors[cindex].Red;
gval = gif_cmap->Colors[cindex].Green;
bval = gif_cmap->Colors[cindex].Blue;
pixcmapAddColor(cmap, rval, gval, bval);
}
if ((pixd = pixCreate(w, h, d)) == NULL) {
DGifCloseFile(gif, &giferr);
pixcmapDestroy(&cmap);
return (PIX *)ERROR_PTR("failed to allocate pixd", procName, NULL);
}
pixSetInputFormat(pixd, IFF_GIF);
pixSetColormap(pixd, cmap);
wpl = pixGetWpl(pixd);
data = pixGetData(pixd);
for (i = 0; i < h; i++) {
line = data + i * wpl;
if (d == 1) {
for (j = 0; j < w; j++) {
if (si.RasterBits[i * w + j])
SET_DATA_BIT(line, j);
}
} else if (d == 2) {
for (j = 0; j < w; j++)
SET_DATA_DIBIT(line, j, si.RasterBits[i * w + j]);
} else if (d == 4) {
for (j = 0; j < w; j++)
SET_DATA_QBIT(line, j, si.RasterBits[i * w + j]);
} else { /* d == 8 */
for (j = 0; j < w; j++)
SET_DATA_BYTE(line, j, si.RasterBits[i * w + j]);
}
}
/* If the image has been interlaced (for viewing in a browser),
* this restores the raster lines to normal order. */
if (gif->Image.Interlace) {
pixdi = pixUninterlaceGIF(pixd);
pixTransferAllData(pixd, &pixdi, 0, 0);
}
DGifCloseFile(gif, &giferr);
return pixd;
}
/* gif_load_img:
* Load GIF image.
*/
int gif_load_img(img I) {
GifFileType *g = I->us;
struct SavedImage *si;
int ret = 0;
unsigned char *p, *end;
GifColorType *pal;
pel *q;
if (DGifSlurp(g) == GIF_ERROR) {
I->err = IE_IMGFORMAT;
return 0;
}
/* Now allocate memory and copy the image into it. */
img_alloc(I);
/* Retrieve only the first image. */
if (g->ImageCount < 1) {
I->err = IE_IMGFORMAT;
goto fail;
}
si = g->SavedImages;
if (si->ImageDesc.Width != I->width || si->ImageDesc.Height != I->height) {
I->err = IE_IMGFORMAT;
goto fail;
}
if (si->ImageDesc.ColorMap)
pal = si->ImageDesc.ColorMap->Colors;
else
pal = g->SColorMap->Colors;
if (si->ImageDesc.Interlace) {
int i;
unsigned char *gifsrc = si->RasterBits;
/* Deal with deranged interlaced GIF file. */
#define COPYROW(src, dest) for (p = (src), q = (dest); p < (src) + I->width; ++p, ++q) \
*q = PELA(pal[*p].Red, pal[*p].Green, pal[*p].Blue, *p == g->SBackGroundColor ? 255 : 0);
/* Pass 1: every 8th row, starting at row 0. */
for (i = 0; i < I->height; i += 8) {
COPYROW(gifsrc, I->data[i]);
gifsrc += I->width;
}
/* Pass 2: every 8th row, starting at row 4. */
for (i = 4; i < I->height; i += 8) {
COPYROW(gifsrc, I->data[i]);
gifsrc += I->width;
}
/* Pass 3: every 4th row, starting at row 2. */
for (i = 2; i < I->height; i += 4) {
COPYROW(gifsrc, I->data[i]);
gifsrc += I->width;
}
/* Pass 4: every 2nd row, starting at row 1. */
for (i = 1; i < I->height; i += 2) {
COPYROW(gifsrc, I->data[i]);
gifsrc += I->width;
}
} else
for (p = (unsigned char*)si->RasterBits, end = p + I->width * I->height, q = I->flat; p < end; ++p, ++q)
*q = PELA(pal[*p].Red, pal[*p].Green, pal[*p].Blue, *p == g->SBackGroundColor ? 255 : 0);
ret = 1;
fail:
DGifCloseFile(g);
return ret;
}
bool ZLWin32ImageManager::gifConvert(const std::string &stringData, ZLWin32ImageData &data, bool &result) const {
result = false;
GifReader reader(stringData);
GifFileType *gif = DGifOpen(&reader, GifReader::inputFunction);
if (gif == 0) {
return false;
}
if (DGifSlurp(gif) != GIF_OK) {
DGifCloseFile(gif);
return false;
}
ColorMapObject* colormap = gif->SColorMap;
if ((colormap == 0) ||
(gif->ImageCount < 1) ||
(colormap->ColorCount != (1 << colormap->BitsPerPixel))) {
DGifCloseFile(gif);
return false;
}
SavedImage* gif_image = gif->SavedImages;
const int width = gif->SWidth;
const int height = gif->SHeight;
int transparent = -1;
for (int i = 0; i < gif_image->ExtensionBlockCount; ++i) {
ExtensionBlock* eb = gif_image->ExtensionBlocks + i;
if (eb->Function == 0xF9 &&
eb->ByteCount == 4) {
if ((eb->Bytes[0] & 1) == 1) {
transparent = (unsigned char)eb->Bytes[3];
}
}
}
data.init(width, height, (transparent != -1), 0);
byte *ptr = gif_image->RasterBits;
if (gif->Image.Interlace) {
for (int i = 0; i < height; i += 8) {
data.setPosition(0, i);
copyLine(*colormap, ptr, data, width, transparent);
}
for (int i = 4; i < height; i += 8) {
data.setPosition(0, i);
copyLine(*colormap, ptr, data, width, transparent);
}
for (int i = 2; i < height; i += 4) {
data.setPosition(0, i);
copyLine(*colormap, ptr, data, width, transparent);
}
for (int i = 1; i < height; i += 2) {
data.setPosition(0, i);
copyLine(*colormap, ptr, data, width, transparent);
}
} else {
for (int i = 0; i < height; ++i) {
data.setPosition(0, i);
copyLine(*colormap, ptr, data, width, transparent);
}
}
DGifCloseFile(gif);
result = true;
return true;
}
/*
* GIFの最初の1枚を読む
*/
static int load_gif_sub(RefImage *image, Value r, int info_only)
{
int err = 0;
int rowbytes;
GifFileType *gif = DGifOpen(&r, gif_read_callback, &err);
if (gif == NULL) {
fs->throw_errorf(mod_image, "ImageError", "Failed to read GIF image");
return FALSE;
}
if (gif->SWidth > MAX_IMAGE_SIZE || gif->SHeight > MAX_IMAGE_SIZE) {
fs->throw_errorf(mod_image, "ImageError", "Image size too large (max:%d)", MAX_IMAGE_SIZE);
DGifCloseFile(gif);
return FALSE;
}
image->bands = BAND_P;
image->width = gif->SWidth;
image->height = gif->SHeight;
rowbytes = image->width;
image->pitch = rowbytes;
if (!info_only) {
const ColorMapObject *cmap;
const SavedImage *si;
if (DGifSlurp(gif) == GIF_ERROR || gif->ImageCount <= 0) {
fs->throw_errorf(mod_image, "ImageError", "Failed to read GIF image");
return FALSE;
}
si = &gif->SavedImages[0];
// パレット読み込み
if (si->ImageDesc.ColorMap != NULL) {
cmap = si->ImageDesc.ColorMap;
} else {
cmap = gif->SColorMap;
}
if (cmap != NULL) {
int i;
int color_key;
uint32_t *col = malloc(sizeof(uint32_t) * PALETTE_NUM);
for (i = 0; i < PALETTE_NUM; i++) {
col[i] = COLOR_A_MASK;
}
for (i = 0; i < cmap->ColorCount; i++) {
const GifColorType *c = &cmap->Colors[i];
col[i] = (c->Red << COLOR_R_SHIFT) | (c->Green << COLOR_G_SHIFT) | (c->Blue << COLOR_B_SHIFT) | COLOR_A_MASK;
}
color_key = get_transparent_index(si);
if (color_key >= 0) {
col[color_key] &= ~COLOR_A_MASK;
}
image->palette = col;
} else {
// Illigal
image->bands = BAND_L;
}
if (si->RasterBits != NULL) {
int y;
int size_alloc = rowbytes * image->height;
const GifImageDesc *id = &si->ImageDesc;
uint8_t *data;
if (size_alloc > fs->max_alloc) {
fs->throw_error_select(THROW_MAX_ALLOC_OVER__INT, fs->max_alloc);
DGifCloseFile(gif);
return FALSE;
}
if (id->Left < 0 || id->Left + id->Width > image->width || id->Top < 0 || id->Top + id->Height > image->height) {
fs->throw_errorf(mod_image, "ImageError", "Invalid GIF format");
DGifCloseFile(gif);
return FALSE;
}
data = malloc(size_alloc);
memset(data, gif->SBackGroundColor, size_alloc);
for (y = 0; y < id->Height; y++) {
memcpy(data + rowbytes * (y + id->Top) + id->Left, si->RasterBits + id->Width * y, id->Width);
}
image->data = data;
}
}
DGifCloseFile(gif);
return TRUE;
}
int
readGif(GifFileType *file, dblData result)
{
ColorMapObject *colorMap;
unsigned char *bits;
unsigned char *data;
unsigned char *p;
int i, nColors, size, alpha, bgColor, alignedWidth, bytesPerColor;
unsigned long outsize;
if(DGifSlurp(file) != GIF_OK)
// error("Error slurping file");
return 0;
/* data should now be available */
/* Local colormap has precedence over Global colormap */
colorMap = file->Image.ColorMap ? file->Image.ColorMap : file->SColorMap;
nColors = colorMap->ColorCount;
alpha = getTransparentColor(file);
/* bgColor is the background color to fill the bitmap with
* if an image is smaller than screen coordinates
*/
if (file->SColorMap) /* There is a GlobalColorMap */
bgColor = file->SBackGroundColor; /* The BackGroundColor is meaningful */
else if (alpha >= 0) /* There is a transparency color */
bgColor = alpha; /* set the bgColor to tranparent */
else
bgColor = 0; /* Don't know what to do here.
* If this doesn't work, we could
* create a new color and set the
* alpha-channel to transparent
* (unless we are using all the 256
* colors, in which case either we
* give up, or move to 16-bits palette
*/
result->hasalpha = 0;
bytesPerColor = 3;
if (alpha >= 0) {
bytesPerColor += 1; /* if tranparent color, use the alpha
* channel (RGBA instead of RGB)
*/
result->hasalpha = 1;
}
/* Ah! The Flash specs says scanlines must be DWORD ALIGNED!
* (but image width is the correct number of pixels)
*/
alignedWidth = (file->SWidth + 3) & ~3;
/* size = size-of-colormap + size-of-bitmap */
size = (nColors * bytesPerColor) + (alignedWidth * file->SHeight);
data = malloc(size);
result->format = 3;
result->width = file->SWidth;
result->height = file->SHeight;
result->format2 = nColors-1; /* size(colorMap) - 1 */
p = data;
/* create ColorMap */
for(i=0; i<nColors; ++i)
{
GifColorType c = colorMap->Colors[i];
if (bytesPerColor == 3) { /* RGB */
*p++ = c.Red;
*p++ = c.Green;
*p++ = c.Blue;
} else { /* RGBA */
#if 1 /* You would think that an alpha value of 0
* would mean fully transparent, but Flash
* player doesn't seem to think so.
* So, we just set the transparency color
* as 0,0,0,0
*/
if (i != alpha) {
*p++ = c.Red;
*p++ = c.Green;
*p++ = c.Blue;
*p++ = 255; /* Fully opaque */
} else {
*p++ = 0; /* red */
*p++ = 0; /* green */
*p++ = 0; /* blue */
*p++ = 0; /* Fully transparent */
}
#else
*p++ = c.Red;
*p++ = c.Green;
*p++ = c.Blue;
*p++ = (i != alpha) ? 255 : 0; /* set alpha to 0 for transparent color */
#endif
}
}
bits = file->SavedImages[0].RasterBits;
if (alignedWidth == file->SWidth
&& file->Image.Width == file->SWidth
&& file->Image.Height == file->SHeight) {
/* we are all nicely aligned and don't need to move the bitmap around.
* Just copy the bits into the output buffer.
*/
memcpy(p, bits, file->SWidth * file->SHeight);
} else {
/* here we need to pad the scanline or to move the bitmap around
* (if the image is not at 0,0 in the logical screen)
*/
int screenWidth = file->SWidth;
int screenHeight = file->SHeight;
int imageTop = file->Image.Top;
int imageBottom = file->Image.Top + file->Image.Height;
int imageLeft = file->Image.Left;
int imageWidth = file->Image.Width;
for (i=0; i < screenHeight; i++, p += alignedWidth) {
/* the image is smaller than the logical "screen":
* Fill the reminder with the background color.
*/
if (imageWidth != screenWidth)
memset(p, bgColor, screenWidth);
/* finally, copy scanline
*/
if (i >= imageTop && i < imageBottom) {
memcpy(p + imageLeft, bits, imageWidth);
bits += imageWidth;
}
}
}
/* Done! */
#if GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
if (DGifCloseFile(file, NULL) != GIF_OK)
return 0;
#else
DGifCloseFile(file);
#endif
result->data = malloc(outsize = (int)floor(size*1.01+12));
/* zlib-compress the gif data */
compress2(result->data, &outsize, data, size, 9);
result->length = outsize;
free(data);
return 1;
}
// Read animated GIF bitstream from 'filename' into 'AnimatedImage' struct.
static int ReadAnimatedGIF(const char filename[], AnimatedImage* const image,
int dump_frames, const char dump_folder[]) {
uint32_t frame_count;
uint32_t canvas_width, canvas_height;
uint32_t i;
int gif_error;
GifFileType* gif;
gif = DGifOpenFileName(filename, NULL);
if (gif == NULL) {
fprintf(stderr, "Could not read file: %s.\n", filename);
return 0;
}
gif_error = DGifSlurp(gif);
if (gif_error != GIF_OK) {
fprintf(stderr, "Could not parse image: %s.\n", filename);
GIFDisplayError(gif, gif_error);
DGifCloseFile(gif, NULL);
return 0;
}
// Animation properties.
image->canvas_width = (uint32_t)gif->SWidth;
image->canvas_height = (uint32_t)gif->SHeight;
if (image->canvas_width > MAX_CANVAS_SIZE ||
image->canvas_height > MAX_CANVAS_SIZE) {
fprintf(stderr, "Invalid canvas dimension: %d x %d\n",
image->canvas_width, image->canvas_height);
DGifCloseFile(gif, NULL);
return 0;
}
image->loop_count = GetLoopCountGIF(gif);
image->bgcolor = GetBackgroundColorGIF(gif);
frame_count = (uint32_t)gif->ImageCount;
if (frame_count == 0) {
DGifCloseFile(gif, NULL);
return 0;
}
if (image->canvas_width == 0 || image->canvas_height == 0) {
image->canvas_width = gif->SavedImages[0].ImageDesc.Width;
image->canvas_height = gif->SavedImages[0].ImageDesc.Height;
gif->SavedImages[0].ImageDesc.Left = 0;
gif->SavedImages[0].ImageDesc.Top = 0;
if (image->canvas_width == 0 || image->canvas_height == 0) {
fprintf(stderr, "Invalid canvas size in GIF.\n");
DGifCloseFile(gif, NULL);
return 0;
}
}
// Allocate frames.
AllocateFrames(image, frame_count);
canvas_width = image->canvas_width;
canvas_height = image->canvas_height;
// Decode and reconstruct frames.
for (i = 0; i < frame_count; ++i) {
const int canvas_width_in_bytes = canvas_width * kNumChannels;
const SavedImage* const curr_gif_image = &gif->SavedImages[i];
GraphicsControlBlock curr_gcb;
DecodedFrame* curr_frame;
uint8_t* curr_rgba;
memset(&curr_gcb, 0, sizeof(curr_gcb));
DGifSavedExtensionToGCB(gif, i, &curr_gcb);
curr_frame = &image->frames[i];
curr_rgba = curr_frame->rgba;
curr_frame->duration = GetFrameDurationGIF(gif, i);
if (i == 0) { // Initialize as transparent.
curr_frame->is_key_frame = 1;
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
} else {
DecodedFrame* const prev_frame = &image->frames[i - 1];
const GifImageDesc* const prev_desc = &gif->SavedImages[i - 1].ImageDesc;
GraphicsControlBlock prev_gcb;
memset(&prev_gcb, 0, sizeof(prev_gcb));
DGifSavedExtensionToGCB(gif, i - 1, &prev_gcb);
curr_frame->is_key_frame =
IsKeyFrameGIF(prev_desc, prev_gcb.DisposalMode, prev_frame,
canvas_width, canvas_height);
if (curr_frame->is_key_frame) { // Initialize as transparent.
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
} else {
int prev_frame_disposed, curr_frame_opaque;
int prev_frame_completely_covered;
// Initialize with previous canvas.
uint8_t* const prev_rgba = image->frames[i - 1].rgba;
CopyCanvas(prev_rgba, curr_rgba, canvas_width, canvas_height);
// Dispose previous frame rectangle.
prev_frame_disposed =
(prev_gcb.DisposalMode == DISPOSE_BACKGROUND ||
prev_gcb.DisposalMode == DISPOSE_PREVIOUS);
curr_frame_opaque =
(curr_gcb.TransparentColor == NO_TRANSPARENT_COLOR);
prev_frame_completely_covered =
curr_frame_opaque &&
CoversFrameGIF(&curr_gif_image->ImageDesc, prev_desc);
if (prev_frame_disposed && !prev_frame_completely_covered) {
switch (prev_gcb.DisposalMode) {
case DISPOSE_BACKGROUND: {
ZeroFillFrameRect(curr_rgba, canvas_width_in_bytes,
prev_desc->Left, prev_desc->Top,
prev_desc->Width, prev_desc->Height);
break;
}
case DISPOSE_PREVIOUS: {
int src_frame_num = i - 2;
while (src_frame_num >= 0) {
GraphicsControlBlock src_frame_gcb;
memset(&src_frame_gcb, 0, sizeof(src_frame_gcb));
DGifSavedExtensionToGCB(gif, src_frame_num, &src_frame_gcb);
if (src_frame_gcb.DisposalMode != DISPOSE_PREVIOUS) break;
--src_frame_num;
}
if (src_frame_num >= 0) {
// Restore pixels inside previous frame rectangle to
// corresponding pixels in source canvas.
uint8_t* const src_frame_rgba =
image->frames[src_frame_num].rgba;
CopyFrameRectangle(src_frame_rgba, curr_rgba,
canvas_width_in_bytes,
prev_desc->Left, prev_desc->Top,
prev_desc->Width, prev_desc->Height);
} else {
// Source canvas doesn't exist. So clear previous frame
// rectangle to background.
ZeroFillFrameRect(curr_rgba, canvas_width_in_bytes,
prev_desc->Left, prev_desc->Top,
prev_desc->Width, prev_desc->Height);
}
break;
}
default:
break; // Nothing to do.
}
}
}
}
// Decode current frame.
if (!ReadFrameGIF(curr_gif_image, gif->SColorMap, curr_gcb.TransparentColor,
canvas_width_in_bytes, curr_rgba)) {
DGifCloseFile(gif, NULL);
return 0;
}
if (dump_frames) {
if (!DumpFrame(filename, dump_folder, i, curr_rgba,
canvas_width, canvas_height)) {
DGifCloseFile(gif, NULL);
return 0;
}
}
}
DGifCloseFile(gif, NULL);
return 1;
}
/*!
* pixReadStreamGif()
*
* Input: stream
* Return: pix, or null on error
*/
PIX *
pixReadStreamGif(FILE *fp)
{
l_int32 fd, wpl, i, j, w, h, d, cindex, ncolors;
l_int32 rval, gval, bval;
l_uint32 *data, *line;
GifFileType *gif;
PIX *pixd, *pixdi;
PIXCMAP *cmap;
ColorMapObject *gif_cmap;
SavedImage si;
PROCNAME("pixReadStreamGif");
if ((fd = fileno(fp)) < 0)
return (PIX *)ERROR_PTR("invalid file descriptor", procName, NULL);
#ifndef _MSC_VER
lseek(fd, 0, SEEK_SET);
#else
_lseek(fd, 0, SEEK_SET);
#endif /* _MSC_VER */
if ((gif = DGifOpenFileHandle(fd)) == NULL)
return (PIX *)ERROR_PTR("invalid file or file not found",
procName, NULL);
/* Read all the data, but use only the first image found */
if (DGifSlurp(gif) != GIF_OK) {
DGifCloseFile(gif);
return (PIX *)ERROR_PTR("failed to read GIF data", procName, NULL);
}
if (gif->SavedImages == NULL) {
DGifCloseFile(gif);
return (PIX *)ERROR_PTR("no images found in GIF", procName, NULL);
}
si = gif->SavedImages[0];
w = si.ImageDesc.Width;
h = si.ImageDesc.Height;
if (w <= 0 || h <= 0) {
DGifCloseFile(gif);
return (PIX *)ERROR_PTR("invalid image dimensions", procName, NULL);
}
if (si.RasterBits == NULL) {
DGifCloseFile(gif);
return (PIX *)ERROR_PTR("no raster data in GIF", procName, NULL);
}
if (si.ImageDesc.ColorMap) {
/* private cmap for this image */
gif_cmap = si.ImageDesc.ColorMap;
}
else if (gif->SColorMap) {
/* global cmap for whole picture */
gif_cmap = gif->SColorMap;
}
else {
/* don't know where to take cmap from */
DGifCloseFile(gif);
return (PIX *)ERROR_PTR("color map is missing", procName, NULL);
}
ncolors = gif_cmap->ColorCount;
if (ncolors <= 2)
d = 1;
else if (ncolors <= 4)
d = 2;
else if (ncolors <= 16)
d = 4;
else
d = 8;
if ((cmap = pixcmapCreate(d)) == NULL)
return (PIX *)ERROR_PTR("cmap creation failed", procName, NULL);
for (cindex = 0; cindex < ncolors; cindex++) {
rval = gif_cmap->Colors[cindex].Red;
gval = gif_cmap->Colors[cindex].Green;
bval = gif_cmap->Colors[cindex].Blue;
pixcmapAddColor(cmap, rval, gval, bval);
}
if ((pixd = pixCreate(w, h, d)) == NULL) {
DGifCloseFile(gif);
pixcmapDestroy(&cmap);
return (PIX *)ERROR_PTR("failed to allocate pixd", procName, NULL);
}
pixSetColormap(pixd, cmap);
wpl = pixGetWpl(pixd);
data = pixGetData(pixd);
for (i = 0; i < h; i++) {
line = data + i * wpl;
if (d == 1) {
for (j = 0; j < w; j++) {
if (si.RasterBits[i * w + j])
SET_DATA_BIT(line, j);
}
}
else if (d == 2) {
for (j = 0; j < w; j++)
SET_DATA_DIBIT(line, j, si.RasterBits[i * w + j]);
}
else if (d == 4) {
for (j = 0; j < w; j++)
SET_DATA_QBIT(line, j, si.RasterBits[i * w + j]);
}
else { /* d == 8 */
for (j = 0; j < w; j++)
SET_DATA_BYTE(line, j, si.RasterBits[i * w + j]);
}
}
if (gif->Image.Interlace) {
pixdi = pixInterlaceGIF(pixd);
pixTransferAllData(pixd, &pixdi, 0, 0);
}
DGifCloseFile(gif);
return pixd;
}
/************************************************************************
return NULL if error
http://www.imagemagick.org/Usage/anim_basics/#dispose
http://wwwcdf.pd.infn.it/libgif/gif89.txt
http://wwwcdf.pd.infn.it/libgif/gif_lib.html
************************************************************************/
static anim_t * giflib_load(SDL_Renderer * render, const char * filename)
{
GifFileType * gif = NULL;
int i = 0;
int j = 0;
int transparent = 0;
unsigned char transparent_color = 0;
int disposal = 0;
int delay = 0;
ColorMapObject * global_pal = NULL;
ColorMapObject * pal = NULL;
SDL_Surface* surf = NULL;
SDL_Surface* prev_surf = NULL;
int x = 0;
int y = 0;
int col = 0;
int pix_index = 0;
anim_t * anim = NULL;
int render_width;
int render_height;
int frame_left = 0;
int frame_top = 0;
int frame_width = 0;
int frame_height = 0;
int allow_draw = 1;
int error = 0;
int ret;
gif = DGifOpenFileName(filename,&error);
if(gif == NULL) {
#if 0
printf("%s: %s\n", filename,GifErrorString(error));
#endif
return NULL;
}
ret = DGifSlurp(gif);
if (ret != GIF_OK) {
DGifCloseFile(gif,&error);
return NULL;
}
if ( gif->Error != D_GIF_SUCCEEDED) {
DGifCloseFile(gif,&error);
return NULL;
}
anim = malloc(sizeof(anim_t));
memset(anim,0,sizeof(anim_t));
anim->num_frame = gif->ImageCount;
anim->tex = malloc(sizeof(SDL_Texture *) * anim->num_frame);
anim->w = gif->SWidth;
anim->h = gif->SHeight;
anim->delay = malloc(sizeof(Uint32) * anim->num_frame);
render_width = gif->SWidth;
render_height = gif->SHeight;
//bg_color = gif->SBackGroundColor;
surf = SDL_CreateRGBSurface(0,render_width,render_height,32,0xff000000,0x00ff0000,0x0000ff00,0x000000ff);
prev_surf = SDL_CreateRGBSurface(0,render_width,render_height,32,0xff000000,0x00ff0000,0x0000ff00,0x000000ff);
global_pal = gif->SColorMap;
pal = global_pal;
/* Init with transparent background */
memset(surf->pixels,0, render_height * render_width * 4 );
for(i=0; i<gif->ImageCount; i++) {
frame_left = gif->SavedImages[i].ImageDesc.Left;
frame_top = gif->SavedImages[i].ImageDesc.Top;
frame_width = gif->SavedImages[i].ImageDesc.Width;
frame_height = gif->SavedImages[i].ImageDesc.Height;
/* select palette */
pal = global_pal;
if( gif->SavedImages[i].ImageDesc.ColorMap ) {
pal = gif->SavedImages[i].ImageDesc.ColorMap;
}
/* GCE */
for(j=0; j<gif->SavedImages[i].ExtensionBlockCount; j++) {
if(gif->SavedImages[i].ExtensionBlocks[j].Function == GIF_GCE) {
transparent = gif->SavedImages[i].ExtensionBlocks[j].Bytes[0] & 0x01;
disposal = (gif->SavedImages[i].ExtensionBlocks[j].Bytes[0] & 28)>>2;
delay = (gif->SavedImages[i].ExtensionBlocks[j].Bytes[1] + gif->SavedImages[i].ExtensionBlocks[j].Bytes[2] * 256)*10;
if(delay==0) {
delay = DEFAULT_DELAY;
}
if(transparent) {
transparent_color = gif->SavedImages[i].ExtensionBlocks[j].Bytes[3];
}
}
}
/* Save the current render if needed */
if( disposal == DISPOSE_PREVIOUS ) {
memcpy(prev_surf->pixels,surf->pixels, render_height * render_width * 4);
}
/* Fill surface buffer with raster bytes */
if( allow_draw ) { // See DISPOSE_DO_NOT
for(y=0; y<frame_height; y++) {
for(x=0; x<frame_width; x++) {
pix_index = ((x+frame_left) + ( (y+frame_top) *render_width))*4;
col = gif->SavedImages[i].RasterBits[(x)+(y)*frame_width];
if( col == transparent_color && transparent) {
/* Transparent color means do not touch the render */
} else {
((char*)surf->pixels)[pix_index+3] = pal->Colors[col].Red;
((char*)surf->pixels)[pix_index+2] = pal->Colors[col].Green;
((char*)surf->pixels)[pix_index+1] = pal->Colors[col].Blue;
((char*)surf->pixels)[pix_index+0] = 0xFF;
}
}
}
}
anim->delay[i] = delay;
anim->tex[i] = SDL_CreateTextureFromSurface(render,surf);
/* Prepare next rendering depending of disposal */
allow_draw = 1;
switch( disposal ) {
/* Do not touch render for next frame */
case DISPOSE_DO_NOT:
allow_draw = 0;
break;
case DISPOSE_BACKGROUND:
/* Draw transparent color in frame */
for(y=0; y<frame_height; y++) {
for(x=0; x<frame_width; x++) {
pix_index = ((x+frame_left)+((y+frame_top)*render_width))*4;
((char*)surf->pixels)[pix_index+3] = 0;
((char*)surf->pixels)[pix_index+2] = 0;
((char*)surf->pixels)[pix_index+1] = 0;
((char*)surf->pixels)[pix_index+0] = 0;
}
}
break;
case DISPOSE_PREVIOUS:
/* Restore previous render in frame*/
memcpy(surf->pixels,prev_surf->pixels, render_height * render_width * 4);
break;
default:
break;
}
}
