127 lines
3.0 KiB
C++
127 lines
3.0 KiB
C++
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#include "GIFLoader.h"
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#include "api__gif.h"
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#include <wchar.h>
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#include <bfc/platform/strcmp.h>
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extern "C" {
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#include "../giflib/gif_lib.h"
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};
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static bool StringEnds(const wchar_t *a, const wchar_t *b)
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{
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size_t aLen = wcslen(a);
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size_t bLen = wcslen(b);
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if (aLen < bLen) return false; // too short
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return !_wcsicmp(a + aLen - bLen, b);
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}
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int GIFLoader::isMine(const wchar_t *filename)
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{
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return (filename && StringEnds(filename, L".GIF"));
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}
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int GIFLoader::getHeaderSize()
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{
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return 3;
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}
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const wchar_t *GIFLoader::mimeType()
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{
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return L"image/gif";
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}
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int GIFLoader::testData(const void *data, int datalen)
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{
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if(datalen >= 3 && strncmp((const char*)data,"GIF",3)==0) return 1;
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return 0;
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}
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typedef struct {
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BYTE * data;
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int len;
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} readStruct;
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extern "C" int myreader(GifFileType *gif, GifByteType *data, int len) {
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readStruct* r = (readStruct*)gif->UserData;
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int l = min(len,r->len);
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if(l == 0) return 0;
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memcpy(data,r->data,l);
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r->len -= l;
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r->data += l;
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return l;
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}
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ARGB32 *GIFLoader::loadImage(const void *datain, int datalen, int *w, int *h, ifc_xmlreaderparams *params)
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{
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readStruct read = {(BYTE*)datain,datalen};
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int* l_error = NULL;
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GifFileType * gif = DGifOpen(&read, myreader, l_error);
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if(!gif) return 0;
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if(!DGifSlurp(gif) || !gif->ImageCount) { DGifCloseFile(gif, l_error); return 0; }
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ColorMapObject *map = gif->SColorMap;
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if(!map) map = gif->SavedImages[0].ImageDesc.ColorMap;
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if(!map) { DGifCloseFile(gif, l_error); return 0; }
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int iw = gif->SavedImages[0].ImageDesc.Width;
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int ih = gif->SavedImages[0].ImageDesc.Height;
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if(w) *w = iw;
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if(h) *h = ih;
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ARGB32 * data = (ARGB32 *)WASABI_API_MEMMGR->sysMalloc(iw * ih * sizeof(ARGB32));
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ARGB32 * p = data;
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ARGB32 * end = data + (iw * ih);
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GifPixelType *line = gif->SavedImages[0].RasterBits;
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if(gif->SavedImages[0].ImageDesc.Interlace)
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{
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// The way Interlaced image should be read - offsets and jumps...
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const int InterlacedOffset[] = { 0, 4, 2, 1 };
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const int InterlacedJumps[] = { 8, 8, 4, 2 };
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for(int i = 0; i < 4; i++)
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{
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for(int j = InterlacedOffset[i]; j < ih; j += InterlacedJumps[i])
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{
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p = &data[j*iw];
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for(int k = 0; k<iw; k++)
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{
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int px = *(line++);
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if(px < map->ColorCount && (px != gif->SBackGroundColor || px == 0)) {
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GifColorType& color = map->Colors[px];
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*(p++) = 0xff000000 | color.Blue | (color.Green << 8) | (color.Red << 16);
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} else
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*(p++) = 0;
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}
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}
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}
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}
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else
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{
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while(p < end) {
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int px = *(line++);
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if(px < map->ColorCount && (px != gif->SBackGroundColor || px == 0)) {
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GifColorType& color = map->Colors[px];
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*(p++) = 0xff000000 | color.Blue | (color.Green << 8) | (color.Red << 16);
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} else
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*(p++) = 0;
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}
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}
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DGifCloseFile(gif, l_error);
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return data;
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}
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#define CBCLASS GIFLoader
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START_DISPATCH;
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CB(ISMINE, isMine);
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CB(MIMETYPE, mimeType);
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CB(TESTDATA, testData);
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CB(GETHEADERSIZE, getHeaderSize);
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CB(GETDIMENSIONS, getDimensions);
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CB(LOADIMAGE, loadImage);
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CB(LOADIMAGEDATA, loadImageData);
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END_DISPATCH;
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#undef CBCLASS
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