oleaut32: Use WIC to decode gif files.
This commit is contained in:
parent
19e7803088
commit
7c9e198a71
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@ -5,7 +5,7 @@ VPATH = @srcdir@
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MODULE = oleaut32.dll
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MODULE = oleaut32.dll
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IMPORTLIB = oleaut32
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IMPORTLIB = oleaut32
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IMPORTS = uuid ole32 rpcrt4 user32 gdi32 advapi32 kernel32 ntdll
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IMPORTS = uuid ole32 rpcrt4 user32 gdi32 advapi32 kernel32 ntdll
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DELAYIMPORTS = comctl32 urlmon
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DELAYIMPORTS = comctl32 urlmon windowscodecs
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EXTRADEFS = -D_OLEAUT32_ -DCOM_NO_WINDOWS_H \
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EXTRADEFS = -D_OLEAUT32_ -DCOM_NO_WINDOWS_H \
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-DENTRY_PREFIX=OLEAUTPS_ -DPROXY_CLSID=CLSID_PSDispatch -DPROXY_DELEGATION -DREGISTER_PROXY_DLL
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-DENTRY_PREFIX=OLEAUTPS_ -DPROXY_CLSID=CLSID_PSDispatch -DPROXY_DELEGATION -DREGISTER_PROXY_DLL
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EXTRAINCL = @PNGINCL@
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EXTRAINCL = @PNGINCL@
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@ -24,7 +24,6 @@ C_SRCS = \
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tmarshal.c \
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tmarshal.c \
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typelib.c \
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typelib.c \
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typelib2.c \
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typelib2.c \
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ungif.c \
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usrmarshal.c \
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usrmarshal.c \
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varformat.c \
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varformat.c \
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variant.c \
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variant.c \
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@ -82,12 +82,11 @@
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#include "oleauto.h"
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#include "oleauto.h"
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#include "connpt.h"
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#include "connpt.h"
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#include "urlmon.h"
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#include "urlmon.h"
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#include "wincodec.h"
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#include "wine/debug.h"
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#include "wine/debug.h"
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#include "wine/unicode.h"
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#include "wine/unicode.h"
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#include "wine/library.h"
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#include "wine/library.h"
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#include "ungif.h"
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WINE_DEFAULT_DEBUG_CHANNEL(ole);
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WINE_DEFAULT_DEBUG_CHANNEL(ole);
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#include "pshpack1.h"
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#include "pshpack1.h"
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@ -1059,220 +1058,6 @@ static jpeg_boolean _jpeg_resync_to_restart(j_decompress_ptr cinfo, int desired)
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static void _jpeg_term_source(j_decompress_ptr cinfo) { }
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static void _jpeg_term_source(j_decompress_ptr cinfo) { }
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#endif /* SONAME_LIBJPEG */
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#endif /* SONAME_LIBJPEG */
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struct gifdata {
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unsigned char *data;
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unsigned int curoff;
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unsigned int len;
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};
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static int _gif_inputfunc(GifFileType *gif, GifByteType *data, int len) {
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struct gifdata *gd = gif->UserData;
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if (len+gd->curoff > gd->len) {
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ERR("Trying to read %d bytes, but only %d available.\n",len, gd->len-gd->curoff);
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len = gd->len - gd->curoff;
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}
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memcpy(data, gd->data+gd->curoff, len);
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gd->curoff += len;
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return len;
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}
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static HRESULT OLEPictureImpl_LoadGif(OLEPictureImpl *This, BYTE *xbuf, ULONG xread)
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{
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struct gifdata gd;
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GifFileType *gif;
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BITMAPINFO *bmi;
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HDC hdcref;
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LPBYTE bytes;
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int i,j,ret;
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GifImageDesc *gid;
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SavedImage *si;
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ColorMapObject *cm;
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int transparent = -1;
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ExtensionBlock *eb;
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int padding;
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gd.data = xbuf;
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gd.curoff = 0;
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gd.len = xread;
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gif = DGifOpen((void*)&gd, _gif_inputfunc);
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ret = DGifSlurp(gif);
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if (ret == GIF_ERROR) {
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ERR("Failed reading GIF using libgif.\n");
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return E_FAIL;
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}
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TRACE("screen height %d, width %d\n", gif->SWidth, gif->SHeight);
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TRACE("color res %d, backgcolor %d\n", gif->SColorResolution, gif->SBackGroundColor);
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TRACE("imgcnt %d\n", gif->ImageCount);
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if (gif->ImageCount<1) {
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ERR("GIF stream does not have images inside?\n");
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return E_FAIL;
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}
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TRACE("curimage: %d x %d, on %dx%d, interlace %d\n",
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gif->Image.Width, gif->Image.Height,
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gif->Image.Left, gif->Image.Top,
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gif->Image.Interlace
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);
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/* */
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padding = (gif->SWidth+3) & ~3;
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si = gif->SavedImages+0;
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gid = &(si->ImageDesc);
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cm = gid->ColorMap;
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if (!cm) cm = gif->SColorMap;
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bmi = HeapAlloc(GetProcessHeap(),0,sizeof(BITMAPINFOHEADER)+(cm->ColorCount)*sizeof(RGBQUAD));
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bytes= HeapAlloc(GetProcessHeap(),0,padding*gif->SHeight);
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/* look for the transparent color extension */
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for (i = 0; i < si->ExtensionBlockCount; ++i) {
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eb = si->ExtensionBlocks + i;
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if (eb->Function == 0xF9 && eb->ByteCount == 4) {
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if ((eb->Bytes[0] & 1) == 1) {
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transparent = (unsigned char)eb->Bytes[3];
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}
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}
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}
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for (i = 0; i < cm->ColorCount; i++) {
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bmi->bmiColors[i].rgbRed = cm->Colors[i].Red;
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bmi->bmiColors[i].rgbGreen = cm->Colors[i].Green;
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bmi->bmiColors[i].rgbBlue = cm->Colors[i].Blue;
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if (i == transparent) {
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This->rgbTrans = RGB(bmi->bmiColors[i].rgbRed,
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bmi->bmiColors[i].rgbGreen,
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bmi->bmiColors[i].rgbBlue);
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}
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}
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/* Map to in picture coordinates */
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for (i = 0, j = 0; i < gid->Height; i++) {
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if (gif->Image.Interlace) {
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memcpy(
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bytes + (gid->Top + j) * padding + gid->Left,
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si->RasterBits + i * gid->Width,
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gid->Width);
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/* Lower bits of interlaced counter encode current interlace */
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if (j & 1) j += 2; /* Currently filling odd rows */
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else if (j & 2) j += 4; /* Currently filling even rows not multiples of 4 */
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else j += 8; /* Currently filling every 8th row or 4th row in-between */
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if (j >= gid->Height && i < gid->Height && (j & 1) == 0) {
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/* End of current interlace, go to next interlace */
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if (j & 2) j = 1; /* Next iteration fills odd rows */
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else if (j & 4) j = 2; /* Next iteration fills even rows not mod 4 and not mod 8 */
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else j = 4; /* Next iteration fills rows in-between rows mod 6 */
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}
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} else {
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memcpy(
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bytes + (gid->Top + i) * padding + gid->Left,
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si->RasterBits + i * gid->Width,
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gid->Width);
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}
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}
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bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bmi->bmiHeader.biWidth = gif->SWidth;
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bmi->bmiHeader.biHeight = -gif->SHeight;
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bmi->bmiHeader.biPlanes = 1;
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bmi->bmiHeader.biBitCount = 8;
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bmi->bmiHeader.biCompression = BI_RGB;
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bmi->bmiHeader.biSizeImage = padding*gif->SHeight;
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bmi->bmiHeader.biXPelsPerMeter = 0;
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bmi->bmiHeader.biYPelsPerMeter = 0;
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bmi->bmiHeader.biClrUsed = cm->ColorCount;
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bmi->bmiHeader.biClrImportant = 0;
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hdcref = GetDC(0);
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This->desc.u.bmp.hbitmap=CreateDIBitmap(
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hdcref,
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&bmi->bmiHeader,
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CBM_INIT,
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bytes,
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bmi,
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DIB_RGB_COLORS
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);
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if (transparent > -1) {
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/* Create the Mask */
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HDC hdc = CreateCompatibleDC(0);
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HDC hdcMask = CreateCompatibleDC(0);
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HBITMAP hOldbitmap;
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HBITMAP hOldbitmapmask;
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unsigned int monopadding = (((unsigned)(gif->SWidth + 31)) >> 5) << 2;
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HBITMAP hTempMask;
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This->hbmXor = CreateDIBitmap(
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hdcref,
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&bmi->bmiHeader,
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CBM_INIT,
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bytes,
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bmi,
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DIB_RGB_COLORS
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);
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bmi->bmiColors[0].rgbRed = 0;
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bmi->bmiColors[0].rgbGreen = 0;
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bmi->bmiColors[0].rgbBlue = 0;
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bmi->bmiColors[1].rgbRed = 255;
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bmi->bmiColors[1].rgbGreen = 255;
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bmi->bmiColors[1].rgbBlue = 255;
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bmi->bmiHeader.biBitCount = 1;
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bmi->bmiHeader.biSizeImage = monopadding*gif->SHeight;
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bmi->bmiHeader.biClrUsed = 2;
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for (i = 0; i < gif->SHeight; i++) {
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unsigned char * colorPointer = bytes + padding * i;
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unsigned char * monoPointer = bytes + monopadding * i;
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for (j = 0; j < gif->SWidth; j++) {
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unsigned char pixel = colorPointer[j];
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if ((j & 7) == 0) monoPointer[j >> 3] = 0;
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if (pixel == (transparent & 0x000000FFU)) monoPointer[j >> 3] |= 1 << (7 - (j & 7));
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}
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}
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hTempMask = CreateDIBitmap(
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hdcref,
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&bmi->bmiHeader,
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CBM_INIT,
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bytes,
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bmi,
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DIB_RGB_COLORS
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);
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bmi->bmiHeader.biHeight = -bmi->bmiHeader.biHeight;
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This->hbmMask = CreateBitmap(bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight, 1, 1, NULL);
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hOldbitmap = SelectObject(hdc, hTempMask);
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hOldbitmapmask = SelectObject(hdcMask, This->hbmMask);
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SetBkColor(hdc, RGB(255, 255, 255));
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BitBlt(hdcMask, 0, 0, bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight, hdc, 0, 0, SRCCOPY);
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/* We no longer need the original bitmap, so we apply the first
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transformation with the mask to speed up the rendering */
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SelectObject(hdc, This->hbmXor);
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SetBkColor(hdc, RGB(0,0,0));
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SetTextColor(hdc, RGB(255,255,255));
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BitBlt(hdc, 0, 0, bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight,
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hdcMask, 0, 0, SRCAND);
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SelectObject(hdc, hOldbitmap);
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SelectObject(hdcMask, hOldbitmapmask);
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DeleteDC(hdcMask);
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DeleteDC(hdc);
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DeleteObject(hTempMask);
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}
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ReleaseDC(0, hdcref);
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This->desc.picType = PICTYPE_BITMAP;
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OLEPictureImpl_SetBitmap(This);
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DGifCloseFile(gif);
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HeapFree(GetProcessHeap(),0,bmi);
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HeapFree(GetProcessHeap(),0,bytes);
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return S_OK;
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}
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static HRESULT OLEPictureImpl_LoadJpeg(OLEPictureImpl *This, BYTE *xbuf, ULONG xread)
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static HRESULT OLEPictureImpl_LoadJpeg(OLEPictureImpl *This, BYTE *xbuf, ULONG xread)
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{
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{
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#ifdef SONAME_LIBJPEG
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#ifdef SONAME_LIBJPEG
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@ -1404,6 +1189,182 @@ static HRESULT OLEPictureImpl_LoadDIB(OLEPictureImpl *This, BYTE *xbuf, ULONG xr
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return S_OK;
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return S_OK;
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}
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}
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static HRESULT OLEPictureImpl_LoadWICSource(OLEPictureImpl *This, IWICBitmapSource *src)
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{
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HRESULT hr;
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BITMAPINFOHEADER bih;
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HDC hdcref;
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UINT width, height;
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UINT stride, buffersize;
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LPBYTE bits=NULL;
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WICRect rc;
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IWICBitmapSource *real_source;
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UINT x, y;
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COLORREF white = RGB(255, 255, 255), black = RGB(0, 0, 0);
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BOOL has_alpha=FALSE;
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hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA, src, &real_source);
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if (FAILED(hr)) return hr;
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hr = IWICBitmapSource_GetSize(real_source, &width, &height);
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if (FAILED(hr)) goto end;
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bih.biSize = sizeof(bih);
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bih.biWidth = width;
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bih.biHeight = -height;
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bih.biPlanes = 1;
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bih.biBitCount = 32;
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bih.biCompression = BI_RGB;
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bih.biSizeImage = 0;
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bih.biXPelsPerMeter = 4085; /* olepicture ignores the stored resolution */
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bih.biYPelsPerMeter = 4085;
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bih.biClrUsed = 0;
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bih.biClrImportant = 0;
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stride = 4 * width;
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buffersize = stride * height;
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bits = HeapAlloc(GetProcessHeap(), 0, buffersize);
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if (!bits)
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{
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hr = E_OUTOFMEMORY;
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goto end;
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}
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rc.X = 0;
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rc.Y = 0;
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rc.Width = width;
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rc.Height = height;
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hr = IWICBitmapSource_CopyPixels(real_source, &rc, stride, buffersize, bits);
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if (FAILED(hr))
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goto end;
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hdcref = GetDC(0);
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This->desc.u.bmp.hbitmap = CreateDIBitmap(
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hdcref,
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&bih,
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CBM_INIT,
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bits,
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(BITMAPINFO*)&bih,
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DIB_RGB_COLORS);
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if (This->desc.u.bmp.hbitmap == 0)
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{
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hr = E_FAIL;
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ReleaseDC(0, hdcref);
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goto end;
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}
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This->desc.picType = PICTYPE_BITMAP;
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OLEPictureImpl_SetBitmap(This);
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/* set transparent pixels to black, all others to white */
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for(y = 0; y < height; y++){
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for(x = 0; x < width; x++){
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DWORD *pixel = (DWORD*)(bits + stride*y + 4*x);
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if((*pixel & 0x80000000) == 0)
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{
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has_alpha = TRUE;
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*pixel = black;
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}
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else
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*pixel = white;
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}
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}
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if (has_alpha)
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{
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HDC hdcBmp, hdcXor, hdcMask;
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HBITMAP hbmoldBmp, hbmoldXor, hbmoldMask;
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This->hbmXor = CreateDIBitmap(
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hdcref,
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&bih,
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CBM_INIT,
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bits,
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(BITMAPINFO*)&bih,
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DIB_RGB_COLORS
|
||||||
|
);
|
||||||
|
|
||||||
|
This->hbmMask = CreateBitmap(width,-height,1,1,NULL);
|
||||||
|
hdcBmp = CreateCompatibleDC(NULL);
|
||||||
|
hdcXor = CreateCompatibleDC(NULL);
|
||||||
|
hdcMask = CreateCompatibleDC(NULL);
|
||||||
|
|
||||||
|
hbmoldBmp = SelectObject(hdcBmp,This->desc.u.bmp.hbitmap);
|
||||||
|
hbmoldXor = SelectObject(hdcXor,This->hbmXor);
|
||||||
|
hbmoldMask = SelectObject(hdcMask,This->hbmMask);
|
||||||
|
|
||||||
|
SetBkColor(hdcXor,black);
|
||||||
|
BitBlt(hdcMask,0,0,width,height,hdcXor,0,0,SRCCOPY);
|
||||||
|
BitBlt(hdcXor,0,0,width,height,hdcBmp,0,0,SRCAND);
|
||||||
|
|
||||||
|
SelectObject(hdcBmp,hbmoldBmp);
|
||||||
|
SelectObject(hdcXor,hbmoldXor);
|
||||||
|
SelectObject(hdcMask,hbmoldMask);
|
||||||
|
|
||||||
|
DeleteDC(hdcBmp);
|
||||||
|
DeleteDC(hdcXor);
|
||||||
|
DeleteDC(hdcMask);
|
||||||
|
}
|
||||||
|
|
||||||
|
ReleaseDC(0, hdcref);
|
||||||
|
|
||||||
|
end:
|
||||||
|
HeapFree(GetProcessHeap(), 0, bits);
|
||||||
|
IWICBitmapSource_Release(real_source);
|
||||||
|
return hr;
|
||||||
|
}
|
||||||
|
|
||||||
|
static HRESULT OLEPictureImpl_LoadWICDecoder(OLEPictureImpl *This, REFCLSID decoder_clsid, BYTE *xbuf, ULONG xread)
|
||||||
|
{
|
||||||
|
HRESULT hr;
|
||||||
|
IWICBitmapDecoder *decoder;
|
||||||
|
IWICBitmapFrameDecode *framedecode;
|
||||||
|
HRESULT initresult;
|
||||||
|
HGLOBAL hdata;
|
||||||
|
BYTE *data;
|
||||||
|
IStream *stream;
|
||||||
|
|
||||||
|
hdata = GlobalAlloc(GMEM_MOVEABLE, xread);
|
||||||
|
if (!hdata) return E_OUTOFMEMORY;
|
||||||
|
|
||||||
|
data = GlobalLock(hdata);
|
||||||
|
memcpy(data, xbuf, xread);
|
||||||
|
GlobalUnlock(hdata);
|
||||||
|
|
||||||
|
hr = CreateStreamOnHGlobal(hdata, TRUE, &stream);
|
||||||
|
if (FAILED(hr))
|
||||||
|
{
|
||||||
|
GlobalFree(hdata);
|
||||||
|
return hr;
|
||||||
|
}
|
||||||
|
|
||||||
|
initresult = CoInitialize(NULL);
|
||||||
|
|
||||||
|
hr = CoCreateInstance(decoder_clsid, NULL, CLSCTX_INPROC_SERVER,
|
||||||
|
&IID_IWICBitmapDecoder, (void**)&decoder);
|
||||||
|
if (FAILED(hr)) goto end;
|
||||||
|
|
||||||
|
hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnLoad);
|
||||||
|
if (SUCCEEDED(hr))
|
||||||
|
{
|
||||||
|
hr = IWICBitmapDecoder_GetFrame(decoder, 0, &framedecode);
|
||||||
|
if (SUCCEEDED(hr))
|
||||||
|
{
|
||||||
|
hr = OLEPictureImpl_LoadWICSource(This, (IWICBitmapSource*)framedecode);
|
||||||
|
IWICBitmapFrameDecode_Release(framedecode);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
IWICBitmapDecoder_Release(decoder);
|
||||||
|
|
||||||
|
end:
|
||||||
|
IStream_Release(stream);
|
||||||
|
if (SUCCEEDED(initresult)) CoUninitialize();
|
||||||
|
return hr;
|
||||||
|
}
|
||||||
|
|
||||||
/*****************************************************
|
/*****************************************************
|
||||||
* start of PNG-specific code
|
* start of PNG-specific code
|
||||||
* currently only supports colortype PNG_COLOR_TYPE_RGB
|
* currently only supports colortype PNG_COLOR_TYPE_RGB
|
||||||
|
@ -1925,7 +1886,7 @@ static HRESULT WINAPI OLEPictureImpl_Load(IPersistStream* iface,IStream*pStm) {
|
||||||
|
|
||||||
switch (magic) {
|
switch (magic) {
|
||||||
case BITMAP_FORMAT_GIF: /* GIF */
|
case BITMAP_FORMAT_GIF: /* GIF */
|
||||||
hr = OLEPictureImpl_LoadGif(This, xbuf, xread);
|
hr = OLEPictureImpl_LoadWICDecoder(This, &CLSID_WICGifDecoder, xbuf, xread);
|
||||||
break;
|
break;
|
||||||
case BITMAP_FORMAT_JPEG: /* JPEG */
|
case BITMAP_FORMAT_JPEG: /* JPEG */
|
||||||
hr = OLEPictureImpl_LoadJpeg(This, xbuf, xread);
|
hr = OLEPictureImpl_LoadJpeg(This, xbuf, xread);
|
||||||
|
|
|
@ -32,6 +32,7 @@
|
||||||
#include "oleauto.h"
|
#include "oleauto.h"
|
||||||
#include "initguid.h"
|
#include "initguid.h"
|
||||||
#include "typelib.h"
|
#include "typelib.h"
|
||||||
|
#include "wincodec.h"
|
||||||
|
|
||||||
#include "wine/debug.h"
|
#include "wine/debug.h"
|
||||||
#include "wine/unicode.h"
|
#include "wine/unicode.h"
|
||||||
|
|
|
@ -1,999 +0,0 @@
|
||||||
/*
|
|
||||||
* Gif extracting routines - derived from libungif
|
|
||||||
*
|
|
||||||
* Portions Copyright 2006 Mike McCormack
|
|
||||||
*
|
|
||||||
* This library is free software; you can redistribute it and/or
|
|
||||||
* modify it under the terms of the GNU Lesser General Public
|
|
||||||
* License as published by the Free Software Foundation; either
|
|
||||||
* version 2.1 of the License, or (at your option) any later version.
|
|
||||||
*
|
|
||||||
* This library is distributed in the hope that it will be useful,
|
|
||||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
||||||
* Lesser General Public License for more details.
|
|
||||||
*
|
|
||||||
* You should have received a copy of the GNU Lesser General Public
|
|
||||||
* License along with this library; if not, write to the Free Software
|
|
||||||
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
|
|
||||||
*/
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Original copyright notice:
|
|
||||||
*
|
|
||||||
* The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
|
|
||||||
*
|
|
||||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
||||||
* of this software and associated documentation files (the "Software"), to deal
|
|
||||||
* in the Software without restriction, including without limitation the rights
|
|
||||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
||||||
* copies of the Software, and to permit persons to whom the Software is
|
|
||||||
* furnished to do so, subject to the following conditions:
|
|
||||||
*
|
|
||||||
* The above copyright notice and this permission notice shall be included in
|
|
||||||
* all copies or substantial portions of the Software.
|
|
||||||
*/
|
|
||||||
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* "Gif-Lib" - Yet another gif library.
|
|
||||||
*
|
|
||||||
* Written by: Gershon Elber IBM PC Ver 1.1, Aug. 1990
|
|
||||||
******************************************************************************
|
|
||||||
* The kernel of the GIF Decoding process can be found here.
|
|
||||||
******************************************************************************
|
|
||||||
* History:
|
|
||||||
* 16 Jun 89 - Version 1.0 by Gershon Elber.
|
|
||||||
* 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names).
|
|
||||||
*****************************************************************************/
|
|
||||||
|
|
||||||
#include <stdlib.h>
|
|
||||||
#include <string.h>
|
|
||||||
#include "ungif.h"
|
|
||||||
|
|
||||||
#include <stdarg.h>
|
|
||||||
#include "windef.h"
|
|
||||||
#include "winbase.h"
|
|
||||||
|
|
||||||
static void *ungif_alloc( size_t sz )
|
|
||||||
{
|
|
||||||
return HeapAlloc( GetProcessHeap(), 0, sz );
|
|
||||||
}
|
|
||||||
|
|
||||||
static void *ungif_calloc( size_t num, size_t sz )
|
|
||||||
{
|
|
||||||
return HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, num*sz );
|
|
||||||
}
|
|
||||||
|
|
||||||
static void *ungif_realloc( void *ptr, size_t sz )
|
|
||||||
{
|
|
||||||
return HeapReAlloc( GetProcessHeap(), 0, ptr, sz );
|
|
||||||
}
|
|
||||||
|
|
||||||
static void ungif_free( void *ptr )
|
|
||||||
{
|
|
||||||
HeapFree( GetProcessHeap(), 0, ptr );
|
|
||||||
}
|
|
||||||
|
|
||||||
#define LZ_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
|
|
||||||
#define LZ_BITS 12
|
|
||||||
|
|
||||||
#define NO_SUCH_CODE 4098 /* Impossible code, to signal empty. */
|
|
||||||
|
|
||||||
typedef struct GifFilePrivateType {
|
|
||||||
GifWord BitsPerPixel, /* Bits per pixel (Codes uses at least this + 1). */
|
|
||||||
ClearCode, /* The CLEAR LZ code. */
|
|
||||||
EOFCode, /* The EOF LZ code. */
|
|
||||||
RunningCode, /* The next code algorithm can generate. */
|
|
||||||
RunningBits, /* The number of bits required to represent RunningCode. */
|
|
||||||
MaxCode1, /* 1 bigger than max. possible code, in RunningBits bits. */
|
|
||||||
LastCode, /* The code before the current code. */
|
|
||||||
CrntCode, /* Current algorithm code. */
|
|
||||||
StackPtr, /* For character stack (see below). */
|
|
||||||
CrntShiftState; /* Number of bits in CrntShiftDWord. */
|
|
||||||
unsigned long CrntShiftDWord; /* For bytes decomposition into codes. */
|
|
||||||
unsigned long PixelCount; /* Number of pixels in image. */
|
|
||||||
InputFunc Read; /* function to read gif input (TVT) */
|
|
||||||
GifByteType Buf[256]; /* Compressed input is buffered here. */
|
|
||||||
GifByteType Stack[LZ_MAX_CODE]; /* Decoded pixels are stacked here. */
|
|
||||||
GifByteType Suffix[LZ_MAX_CODE + 1]; /* So we can trace the codes. */
|
|
||||||
GifPrefixType Prefix[LZ_MAX_CODE + 1];
|
|
||||||
} GifFilePrivateType;
|
|
||||||
|
|
||||||
/* avoid extra function call in case we use fread (TVT) */
|
|
||||||
#define READ(_gif,_buf,_len) \
|
|
||||||
((GifFilePrivateType*)_gif->Private)->Read(_gif,_buf,_len)
|
|
||||||
|
|
||||||
static int DGifGetWord(GifFileType *GifFile, GifWord *Word);
|
|
||||||
static int DGifSetupDecompress(GifFileType *GifFile);
|
|
||||||
static int DGifDecompressLine(GifFileType *GifFile, GifPixelType *Line, int LineLen);
|
|
||||||
static int DGifGetPrefixChar(const GifPrefixType *Prefix, int Code, int ClearCode);
|
|
||||||
static int DGifDecompressInput(GifFileType *GifFile, int *Code);
|
|
||||||
static int DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf,
|
|
||||||
GifByteType *NextByte);
|
|
||||||
|
|
||||||
static int DGifGetExtensionNext(GifFileType * GifFile, GifByteType ** GifExtension);
|
|
||||||
static int DGifGetCodeNext(GifFileType * GifFile, GifByteType ** GifCodeBlock);
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Miscellaneous utility functions
|
|
||||||
*****************************************************************************/
|
|
||||||
|
|
||||||
/* return smallest bitfield size n will fit in */
|
|
||||||
static int
|
|
||||||
BitSize(int n) {
|
|
||||||
|
|
||||||
register int i;
|
|
||||||
|
|
||||||
for (i = 1; i <= 8; i++)
|
|
||||||
if ((1 << i) >= n)
|
|
||||||
break;
|
|
||||||
return (i);
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Color map object functions
|
|
||||||
*****************************************************************************/
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Allocate a color map of given size; initialize with contents of
|
|
||||||
* ColorMap if that pointer is non-NULL.
|
|
||||||
*/
|
|
||||||
static ColorMapObject *
|
|
||||||
MakeMapObject(int ColorCount,
|
|
||||||
const GifColorType * ColorMap) {
|
|
||||||
|
|
||||||
ColorMapObject *Object;
|
|
||||||
|
|
||||||
/*** FIXME: Our ColorCount has to be a power of two. Is it necessary to
|
|
||||||
* make the user know that or should we automatically round up instead? */
|
|
||||||
if (ColorCount != (1 << BitSize(ColorCount))) {
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
Object = ungif_alloc(sizeof(ColorMapObject));
|
|
||||||
if (Object == NULL) {
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
Object->Colors = ungif_calloc(ColorCount, sizeof(GifColorType));
|
|
||||||
if (Object->Colors == NULL) {
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
Object->ColorCount = ColorCount;
|
|
||||||
Object->BitsPerPixel = BitSize(ColorCount);
|
|
||||||
|
|
||||||
if (ColorMap) {
|
|
||||||
memcpy(Object->Colors, ColorMap, ColorCount * sizeof(GifColorType));
|
|
||||||
}
|
|
||||||
|
|
||||||
return (Object);
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Free a color map object
|
|
||||||
*/
|
|
||||||
static void
|
|
||||||
FreeMapObject(ColorMapObject * Object) {
|
|
||||||
|
|
||||||
if (Object != NULL) {
|
|
||||||
ungif_free(Object->Colors);
|
|
||||||
ungif_free(Object);
|
|
||||||
/*** FIXME:
|
|
||||||
* When we are willing to break API we need to make this function
|
|
||||||
* FreeMapObject(ColorMapObject **Object)
|
|
||||||
* and do this assignment to NULL here:
|
|
||||||
* *Object = NULL;
|
|
||||||
*/
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static int
|
|
||||||
AddExtensionBlock(SavedImage * New,
|
|
||||||
int Len,
|
|
||||||
const unsigned char ExtData[]) {
|
|
||||||
|
|
||||||
ExtensionBlock *ep;
|
|
||||||
|
|
||||||
if (New->ExtensionBlocks == NULL)
|
|
||||||
New->ExtensionBlocks = ungif_alloc(sizeof(ExtensionBlock));
|
|
||||||
else
|
|
||||||
New->ExtensionBlocks = ungif_realloc(New->ExtensionBlocks,
|
|
||||||
sizeof(ExtensionBlock) *
|
|
||||||
(New->ExtensionBlockCount + 1));
|
|
||||||
|
|
||||||
if (New->ExtensionBlocks == NULL)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
|
|
||||||
ep = &New->ExtensionBlocks[New->ExtensionBlockCount++];
|
|
||||||
|
|
||||||
ep->ByteCount=Len;
|
|
||||||
ep->Bytes = ungif_alloc(ep->ByteCount);
|
|
||||||
if (ep->Bytes == NULL)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
|
|
||||||
if (ExtData) {
|
|
||||||
memcpy(ep->Bytes, ExtData, Len);
|
|
||||||
ep->Function = New->Function;
|
|
||||||
}
|
|
||||||
|
|
||||||
return (GIF_OK);
|
|
||||||
}
|
|
||||||
|
|
||||||
static void
|
|
||||||
FreeExtension(SavedImage * Image)
|
|
||||||
{
|
|
||||||
ExtensionBlock *ep;
|
|
||||||
|
|
||||||
if ((Image == NULL) || (Image->ExtensionBlocks == NULL)) {
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
for (ep = Image->ExtensionBlocks;
|
|
||||||
ep < (Image->ExtensionBlocks + Image->ExtensionBlockCount); ep++)
|
|
||||||
ungif_free(ep->Bytes);
|
|
||||||
ungif_free(Image->ExtensionBlocks);
|
|
||||||
Image->ExtensionBlocks = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Image block allocation functions
|
|
||||||
******************************************************************************/
|
|
||||||
|
|
||||||
static void
|
|
||||||
FreeSavedImages(GifFileType * GifFile) {
|
|
||||||
|
|
||||||
SavedImage *sp;
|
|
||||||
|
|
||||||
if ((GifFile == NULL) || (GifFile->SavedImages == NULL)) {
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
for (sp = GifFile->SavedImages;
|
|
||||||
sp < GifFile->SavedImages + GifFile->ImageCount; sp++) {
|
|
||||||
if (sp->ImageDesc.ColorMap) {
|
|
||||||
FreeMapObject(sp->ImageDesc.ColorMap);
|
|
||||||
sp->ImageDesc.ColorMap = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
ungif_free(sp->RasterBits);
|
|
||||||
|
|
||||||
if (sp->ExtensionBlocks)
|
|
||||||
FreeExtension(sp);
|
|
||||||
}
|
|
||||||
ungif_free(GifFile->SavedImages);
|
|
||||||
GifFile->SavedImages=NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* This routine should be called before any other DGif calls. Note that
|
|
||||||
* this routine is called automatically from DGif file open routines.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetScreenDesc(GifFileType * GifFile) {
|
|
||||||
|
|
||||||
int i, BitsPerPixel;
|
|
||||||
GifByteType Buf[3];
|
|
||||||
|
|
||||||
/* Put the screen descriptor into the file: */
|
|
||||||
if (DGifGetWord(GifFile, &GifFile->SWidth) == GIF_ERROR ||
|
|
||||||
DGifGetWord(GifFile, &GifFile->SHeight) == GIF_ERROR)
|
|
||||||
return GIF_ERROR;
|
|
||||||
|
|
||||||
if (READ(GifFile, Buf, 3) != 3) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
GifFile->SColorResolution = (((Buf[0] & 0x70) + 1) >> 4) + 1;
|
|
||||||
BitsPerPixel = (Buf[0] & 0x07) + 1;
|
|
||||||
GifFile->SBackGroundColor = Buf[1];
|
|
||||||
if (Buf[0] & 0x80) { /* Do we have global color map? */
|
|
||||||
|
|
||||||
GifFile->SColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
|
|
||||||
if (GifFile->SColorMap == NULL) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Get the global color map: */
|
|
||||||
for (i = 0; i < GifFile->SColorMap->ColorCount; i++) {
|
|
||||||
if (READ(GifFile, Buf, 3) != 3) {
|
|
||||||
FreeMapObject(GifFile->SColorMap);
|
|
||||||
GifFile->SColorMap = NULL;
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
GifFile->SColorMap->Colors[i].Red = Buf[0];
|
|
||||||
GifFile->SColorMap->Colors[i].Green = Buf[1];
|
|
||||||
GifFile->SColorMap->Colors[i].Blue = Buf[2];
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
GifFile->SColorMap = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* This routine should be called before any attempt to read an image.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetRecordType(GifFileType * GifFile,
|
|
||||||
GifRecordType * Type) {
|
|
||||||
|
|
||||||
GifByteType Buf;
|
|
||||||
|
|
||||||
if (READ(GifFile, &Buf, 1) != 1) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
switch (Buf) {
|
|
||||||
case ',':
|
|
||||||
*Type = IMAGE_DESC_RECORD_TYPE;
|
|
||||||
break;
|
|
||||||
case '!':
|
|
||||||
*Type = EXTENSION_RECORD_TYPE;
|
|
||||||
break;
|
|
||||||
case ';':
|
|
||||||
*Type = TERMINATE_RECORD_TYPE;
|
|
||||||
break;
|
|
||||||
default:
|
|
||||||
*Type = UNDEFINED_RECORD_TYPE;
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* This routine should be called before any attempt to read an image.
|
|
||||||
* Note it is assumed the Image desc. header (',') has been read.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetImageDesc(GifFileType * GifFile) {
|
|
||||||
|
|
||||||
int i, BitsPerPixel;
|
|
||||||
GifByteType Buf[3];
|
|
||||||
GifFilePrivateType *Private = GifFile->Private;
|
|
||||||
SavedImage *sp;
|
|
||||||
|
|
||||||
if (DGifGetWord(GifFile, &GifFile->Image.Left) == GIF_ERROR ||
|
|
||||||
DGifGetWord(GifFile, &GifFile->Image.Top) == GIF_ERROR ||
|
|
||||||
DGifGetWord(GifFile, &GifFile->Image.Width) == GIF_ERROR ||
|
|
||||||
DGifGetWord(GifFile, &GifFile->Image.Height) == GIF_ERROR)
|
|
||||||
return GIF_ERROR;
|
|
||||||
if (READ(GifFile, Buf, 1) != 1) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
BitsPerPixel = (Buf[0] & 0x07) + 1;
|
|
||||||
GifFile->Image.Interlace = (Buf[0] & 0x40);
|
|
||||||
if (Buf[0] & 0x80) { /* Does this image have local color map? */
|
|
||||||
|
|
||||||
/*** FIXME: Why do we check both of these in order to do this?
|
|
||||||
* Why do we have both Image and SavedImages? */
|
|
||||||
if (GifFile->Image.ColorMap && GifFile->SavedImages == NULL)
|
|
||||||
FreeMapObject(GifFile->Image.ColorMap);
|
|
||||||
|
|
||||||
GifFile->Image.ColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
|
|
||||||
if (GifFile->Image.ColorMap == NULL) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Get the image local color map: */
|
|
||||||
for (i = 0; i < GifFile->Image.ColorMap->ColorCount; i++) {
|
|
||||||
if (READ(GifFile, Buf, 3) != 3) {
|
|
||||||
FreeMapObject(GifFile->Image.ColorMap);
|
|
||||||
GifFile->Image.ColorMap = NULL;
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
GifFile->Image.ColorMap->Colors[i].Red = Buf[0];
|
|
||||||
GifFile->Image.ColorMap->Colors[i].Green = Buf[1];
|
|
||||||
GifFile->Image.ColorMap->Colors[i].Blue = Buf[2];
|
|
||||||
}
|
|
||||||
} else if (GifFile->Image.ColorMap) {
|
|
||||||
FreeMapObject(GifFile->Image.ColorMap);
|
|
||||||
GifFile->Image.ColorMap = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (GifFile->SavedImages) {
|
|
||||||
if ((GifFile->SavedImages = ungif_realloc(GifFile->SavedImages,
|
|
||||||
sizeof(SavedImage) *
|
|
||||||
(GifFile->ImageCount + 1))) == NULL) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
if ((GifFile->SavedImages = ungif_alloc(sizeof(SavedImage))) == NULL) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
sp = &GifFile->SavedImages[GifFile->ImageCount];
|
|
||||||
sp->ImageDesc = GifFile->Image;
|
|
||||||
if (GifFile->Image.ColorMap != NULL) {
|
|
||||||
sp->ImageDesc.ColorMap = MakeMapObject(
|
|
||||||
GifFile->Image.ColorMap->ColorCount,
|
|
||||||
GifFile->Image.ColorMap->Colors);
|
|
||||||
if (sp->ImageDesc.ColorMap == NULL) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
sp->RasterBits = NULL;
|
|
||||||
sp->ExtensionBlockCount = 0;
|
|
||||||
sp->ExtensionBlocks = NULL;
|
|
||||||
|
|
||||||
GifFile->ImageCount++;
|
|
||||||
|
|
||||||
Private->PixelCount = (long)GifFile->Image.Width *
|
|
||||||
(long)GifFile->Image.Height;
|
|
||||||
|
|
||||||
DGifSetupDecompress(GifFile); /* Reset decompress algorithm parameters. */
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Get one full scanned line (Line) of length LineLen from GIF file.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetLine(GifFileType * GifFile,
|
|
||||||
GifPixelType * Line,
|
|
||||||
int LineLen) {
|
|
||||||
|
|
||||||
GifByteType *Dummy;
|
|
||||||
GifFilePrivateType *Private = GifFile->Private;
|
|
||||||
|
|
||||||
if (!LineLen)
|
|
||||||
LineLen = GifFile->Image.Width;
|
|
||||||
|
|
||||||
if ((Private->PixelCount -= LineLen) > 0xffff0000UL) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (DGifDecompressLine(GifFile, Line, LineLen) == GIF_OK) {
|
|
||||||
if (Private->PixelCount == 0) {
|
|
||||||
/* We probably would not be called any more, so lets clean
|
|
||||||
* everything before we return: need to flush out all rest of
|
|
||||||
* image until empty block (size 0) detected. We use GetCodeNext. */
|
|
||||||
do
|
|
||||||
if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR)
|
|
||||||
return GIF_ERROR;
|
|
||||||
while (Dummy != NULL) ;
|
|
||||||
}
|
|
||||||
return GIF_OK;
|
|
||||||
} else
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Get an extension block (see GIF manual) from gif file. This routine only
|
|
||||||
* returns the first data block, and DGifGetExtensionNext should be called
|
|
||||||
* after this one until NULL extension is returned.
|
|
||||||
* The Extension should NOT be freed by the user (not dynamically allocated).
|
|
||||||
* Note it is assumed the Extension desc. header ('!') has been read.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetExtension(GifFileType * GifFile,
|
|
||||||
int *ExtCode,
|
|
||||||
GifByteType ** Extension) {
|
|
||||||
|
|
||||||
GifByteType Buf;
|
|
||||||
|
|
||||||
if (READ(GifFile, &Buf, 1) != 1) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
*ExtCode = Buf;
|
|
||||||
|
|
||||||
return DGifGetExtensionNext(GifFile, Extension);
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Get a following extension block (see GIF manual) from gif file. This
|
|
||||||
* routine should be called until NULL Extension is returned.
|
|
||||||
* The Extension should NOT be freed by the user (not dynamically allocated).
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetExtensionNext(GifFileType * GifFile,
|
|
||||||
GifByteType ** Extension) {
|
|
||||||
|
|
||||||
GifByteType Buf;
|
|
||||||
GifFilePrivateType *Private = GifFile->Private;
|
|
||||||
|
|
||||||
if (READ(GifFile, &Buf, 1) != 1) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
if (Buf > 0) {
|
|
||||||
*Extension = Private->Buf; /* Use private unused buffer. */
|
|
||||||
(*Extension)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */
|
|
||||||
if (READ(GifFile, &((*Extension)[1]), Buf) != Buf) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
} else
|
|
||||||
*Extension = NULL;
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Get 2 bytes (word) from the given file:
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetWord(GifFileType * GifFile,
|
|
||||||
GifWord *Word) {
|
|
||||||
|
|
||||||
unsigned char c[2];
|
|
||||||
|
|
||||||
if (READ(GifFile, c, 2) != 2) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
*Word = (((unsigned int)c[1]) << 8) + c[0];
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Continue to get the image code in compressed form. This routine should be
|
|
||||||
* called until NULL block is returned.
|
|
||||||
* The block should NOT be freed by the user (not dynamically allocated).
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetCodeNext(GifFileType * GifFile,
|
|
||||||
GifByteType ** CodeBlock) {
|
|
||||||
|
|
||||||
GifByteType Buf;
|
|
||||||
GifFilePrivateType *Private = GifFile->Private;
|
|
||||||
|
|
||||||
if (READ(GifFile, &Buf, 1) != 1) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (Buf > 0) {
|
|
||||||
*CodeBlock = Private->Buf; /* Use private unused buffer. */
|
|
||||||
(*CodeBlock)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */
|
|
||||||
if (READ(GifFile, &((*CodeBlock)[1]), Buf) != Buf) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
*CodeBlock = NULL;
|
|
||||||
Private->Buf[0] = 0; /* Make sure the buffer is empty! */
|
|
||||||
Private->PixelCount = 0; /* And local info. indicate image read. */
|
|
||||||
}
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Setup the LZ decompression for this image:
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifSetupDecompress(GifFileType * GifFile) {
|
|
||||||
|
|
||||||
int i, BitsPerPixel;
|
|
||||||
GifByteType CodeSize;
|
|
||||||
GifPrefixType *Prefix;
|
|
||||||
GifFilePrivateType *Private = GifFile->Private;
|
|
||||||
|
|
||||||
READ(GifFile, &CodeSize, 1); /* Read Code size from file. */
|
|
||||||
BitsPerPixel = CodeSize;
|
|
||||||
|
|
||||||
Private->Buf[0] = 0; /* Input Buffer empty. */
|
|
||||||
Private->BitsPerPixel = BitsPerPixel;
|
|
||||||
Private->ClearCode = (1 << BitsPerPixel);
|
|
||||||
Private->EOFCode = Private->ClearCode + 1;
|
|
||||||
Private->RunningCode = Private->EOFCode + 1;
|
|
||||||
Private->RunningBits = BitsPerPixel + 1; /* Number of bits per code. */
|
|
||||||
Private->MaxCode1 = 1 << Private->RunningBits; /* Max. code + 1. */
|
|
||||||
Private->StackPtr = 0; /* No pixels on the pixel stack. */
|
|
||||||
Private->LastCode = NO_SUCH_CODE;
|
|
||||||
Private->CrntShiftState = 0; /* No information in CrntShiftDWord. */
|
|
||||||
Private->CrntShiftDWord = 0;
|
|
||||||
|
|
||||||
Prefix = Private->Prefix;
|
|
||||||
for (i = 0; i <= LZ_MAX_CODE; i++)
|
|
||||||
Prefix[i] = NO_SUCH_CODE;
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* The LZ decompression routine:
|
|
||||||
* This version decompress the given gif file into Line of length LineLen.
|
|
||||||
* This routine can be called few times (one per scan line, for example), in
|
|
||||||
* order the complete the whole image.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifDecompressLine(GifFileType * GifFile,
|
|
||||||
GifPixelType * Line,
|
|
||||||
int LineLen) {
|
|
||||||
|
|
||||||
int i = 0;
|
|
||||||
int j, CrntCode, EOFCode, ClearCode, CrntPrefix, LastCode, StackPtr;
|
|
||||||
GifByteType *Stack, *Suffix;
|
|
||||||
GifPrefixType *Prefix;
|
|
||||||
GifFilePrivateType *Private = GifFile->Private;
|
|
||||||
|
|
||||||
StackPtr = Private->StackPtr;
|
|
||||||
Prefix = Private->Prefix;
|
|
||||||
Suffix = Private->Suffix;
|
|
||||||
Stack = Private->Stack;
|
|
||||||
EOFCode = Private->EOFCode;
|
|
||||||
ClearCode = Private->ClearCode;
|
|
||||||
LastCode = Private->LastCode;
|
|
||||||
|
|
||||||
if (StackPtr != 0) {
|
|
||||||
/* Let pop the stack off before continuing to read the gif file: */
|
|
||||||
while (StackPtr != 0 && i < LineLen)
|
|
||||||
Line[i++] = Stack[--StackPtr];
|
|
||||||
}
|
|
||||||
|
|
||||||
while (i < LineLen) { /* Decode LineLen items. */
|
|
||||||
if (DGifDecompressInput(GifFile, &CrntCode) == GIF_ERROR)
|
|
||||||
return GIF_ERROR;
|
|
||||||
|
|
||||||
if (CrntCode == EOFCode) {
|
|
||||||
/* Note, however, that usually we will not be here as we will stop
|
|
||||||
* decoding as soon as we got all the pixel, or EOF code will
|
|
||||||
* not be read at all, and DGifGetLine/Pixel clean everything. */
|
|
||||||
if (i != LineLen - 1 || Private->PixelCount != 0) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
i++;
|
|
||||||
} else if (CrntCode == ClearCode) {
|
|
||||||
/* We need to start over again: */
|
|
||||||
for (j = 0; j <= LZ_MAX_CODE; j++)
|
|
||||||
Prefix[j] = NO_SUCH_CODE;
|
|
||||||
Private->RunningCode = Private->EOFCode + 1;
|
|
||||||
Private->RunningBits = Private->BitsPerPixel + 1;
|
|
||||||
Private->MaxCode1 = 1 << Private->RunningBits;
|
|
||||||
LastCode = Private->LastCode = NO_SUCH_CODE;
|
|
||||||
} else {
|
|
||||||
/* It's a regular code - if in pixel range simply add it to output
|
|
||||||
* stream, otherwise trace to codes linked list until the prefix
|
|
||||||
* is in pixel range: */
|
|
||||||
if (CrntCode < ClearCode) {
|
|
||||||
/* This is simple - its pixel scalar, so add it to output: */
|
|
||||||
Line[i++] = CrntCode;
|
|
||||||
} else {
|
|
||||||
/* It's a code to be traced: trace the linked list
|
|
||||||
* until the prefix is a pixel, while pushing the suffix
|
|
||||||
* pixels on our stack. If we done, pop the stack in reverse
|
|
||||||
* order (that's what stack is good for!) for output. */
|
|
||||||
if (Prefix[CrntCode] == NO_SUCH_CODE) {
|
|
||||||
/* Only allowed if CrntCode is exactly the running code:
|
|
||||||
* In that case CrntCode = XXXCode, CrntCode or the
|
|
||||||
* prefix code is last code and the suffix char is
|
|
||||||
* exactly the prefix of last code! */
|
|
||||||
if (CrntCode == Private->RunningCode - 2) {
|
|
||||||
CrntPrefix = LastCode;
|
|
||||||
Suffix[Private->RunningCode - 2] =
|
|
||||||
Stack[StackPtr++] = DGifGetPrefixChar(Prefix,
|
|
||||||
LastCode,
|
|
||||||
ClearCode);
|
|
||||||
} else {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
} else
|
|
||||||
CrntPrefix = CrntCode;
|
|
||||||
|
|
||||||
/* Now (if image is O.K.) we should not get a NO_SUCH_CODE
|
|
||||||
* during the trace. As we might loop forever, in case of
|
|
||||||
* defective image, we count the number of loops we trace
|
|
||||||
* and stop if we got LZ_MAX_CODE. Obviously we cannot
|
|
||||||
* loop more than that. */
|
|
||||||
j = 0;
|
|
||||||
while (j++ <= LZ_MAX_CODE &&
|
|
||||||
CrntPrefix > ClearCode && CrntPrefix <= LZ_MAX_CODE) {
|
|
||||||
Stack[StackPtr++] = Suffix[CrntPrefix];
|
|
||||||
CrntPrefix = Prefix[CrntPrefix];
|
|
||||||
}
|
|
||||||
if (j >= LZ_MAX_CODE || CrntPrefix > LZ_MAX_CODE) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
/* Push the last character on stack: */
|
|
||||||
Stack[StackPtr++] = CrntPrefix;
|
|
||||||
|
|
||||||
/* Now lets pop all the stack into output: */
|
|
||||||
while (StackPtr != 0 && i < LineLen)
|
|
||||||
Line[i++] = Stack[--StackPtr];
|
|
||||||
}
|
|
||||||
if (LastCode != NO_SUCH_CODE) {
|
|
||||||
Prefix[Private->RunningCode - 2] = LastCode;
|
|
||||||
|
|
||||||
if (CrntCode == Private->RunningCode - 2) {
|
|
||||||
/* Only allowed if CrntCode is exactly the running code:
|
|
||||||
* In that case CrntCode = XXXCode, CrntCode or the
|
|
||||||
* prefix code is last code and the suffix char is
|
|
||||||
* exactly the prefix of last code! */
|
|
||||||
Suffix[Private->RunningCode - 2] =
|
|
||||||
DGifGetPrefixChar(Prefix, LastCode, ClearCode);
|
|
||||||
} else {
|
|
||||||
Suffix[Private->RunningCode - 2] =
|
|
||||||
DGifGetPrefixChar(Prefix, CrntCode, ClearCode);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
LastCode = CrntCode;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
Private->LastCode = LastCode;
|
|
||||||
Private->StackPtr = StackPtr;
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Routine to trace the Prefixes linked list until we get a prefix which is
|
|
||||||
* not code, but a pixel value (less than ClearCode). Returns that pixel value.
|
|
||||||
* If image is defective, we might loop here forever, so we limit the loops to
|
|
||||||
* the maximum possible if image O.k. - LZ_MAX_CODE times.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifGetPrefixChar(const GifPrefixType *Prefix,
|
|
||||||
int Code,
|
|
||||||
int ClearCode) {
|
|
||||||
|
|
||||||
int i = 0;
|
|
||||||
|
|
||||||
while (Code > ClearCode && i++ <= LZ_MAX_CODE)
|
|
||||||
Code = Prefix[Code];
|
|
||||||
return Code;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* The LZ decompression input routine:
|
|
||||||
* This routine is responsible for the decompression of the bit stream from
|
|
||||||
* 8 bits (bytes) packets, into the real codes.
|
|
||||||
* Returns GIF_OK if read successfully.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifDecompressInput(GifFileType * GifFile,
|
|
||||||
int *Code) {
|
|
||||||
|
|
||||||
GifFilePrivateType *Private = GifFile->Private;
|
|
||||||
|
|
||||||
GifByteType NextByte;
|
|
||||||
static const unsigned short CodeMasks[] = {
|
|
||||||
0x0000, 0x0001, 0x0003, 0x0007,
|
|
||||||
0x000f, 0x001f, 0x003f, 0x007f,
|
|
||||||
0x00ff, 0x01ff, 0x03ff, 0x07ff,
|
|
||||||
0x0fff
|
|
||||||
};
|
|
||||||
/* The image can't contain more than LZ_BITS per code. */
|
|
||||||
if (Private->RunningBits > LZ_BITS) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
|
|
||||||
while (Private->CrntShiftState < Private->RunningBits) {
|
|
||||||
/* Needs to get more bytes from input stream for next code: */
|
|
||||||
if (DGifBufferedInput(GifFile, Private->Buf, &NextByte) == GIF_ERROR) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
Private->CrntShiftDWord |=
|
|
||||||
((unsigned long)NextByte) << Private->CrntShiftState;
|
|
||||||
Private->CrntShiftState += 8;
|
|
||||||
}
|
|
||||||
*Code = Private->CrntShiftDWord & CodeMasks[Private->RunningBits];
|
|
||||||
|
|
||||||
Private->CrntShiftDWord >>= Private->RunningBits;
|
|
||||||
Private->CrntShiftState -= Private->RunningBits;
|
|
||||||
|
|
||||||
/* If code cannot fit into RunningBits bits, must raise its size. Note
|
|
||||||
* however that codes above 4095 are used for special signaling.
|
|
||||||
* If we're using LZ_BITS bits already and we're at the max code, just
|
|
||||||
* keep using the table as it is, don't increment Private->RunningCode.
|
|
||||||
*/
|
|
||||||
if (Private->RunningCode < LZ_MAX_CODE + 2 &&
|
|
||||||
++Private->RunningCode > Private->MaxCode1 &&
|
|
||||||
Private->RunningBits < LZ_BITS) {
|
|
||||||
Private->MaxCode1 <<= 1;
|
|
||||||
Private->RunningBits++;
|
|
||||||
}
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* This routines read one gif data block at a time and buffers it internally
|
|
||||||
* so that the decompression routine could access it.
|
|
||||||
* The routine returns the next byte from its internal buffer (or read next
|
|
||||||
* block in if buffer empty) and returns GIF_OK if successful.
|
|
||||||
*****************************************************************************/
|
|
||||||
static int
|
|
||||||
DGifBufferedInput(GifFileType * GifFile,
|
|
||||||
GifByteType * Buf,
|
|
||||||
GifByteType * NextByte) {
|
|
||||||
|
|
||||||
if (Buf[0] == 0) {
|
|
||||||
/* Needs to read the next buffer - this one is empty: */
|
|
||||||
if (READ(GifFile, Buf, 1) != 1) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
/* There shouldn't be any empty data blocks here as the LZW spec
|
|
||||||
* says the LZW termination code should come first. Therefore we
|
|
||||||
* shouldn't be inside this routine at that point.
|
|
||||||
*/
|
|
||||||
if (Buf[0] == 0) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
if (READ(GifFile, &Buf[1], Buf[0]) != Buf[0]) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
*NextByte = Buf[1];
|
|
||||||
Buf[1] = 2; /* We use now the second place as last char read! */
|
|
||||||
Buf[0]--;
|
|
||||||
} else {
|
|
||||||
*NextByte = Buf[Buf[1]++];
|
|
||||||
Buf[0]--;
|
|
||||||
}
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* This routine reads an entire GIF into core, hanging all its state info off
|
|
||||||
* the GifFileType pointer. Call DGifOpenFileName() or DGifOpenFileHandle()
|
|
||||||
* first to initialize I/O. Its inverse is EGifSpew().
|
|
||||||
******************************************************************************/
|
|
||||||
int
|
|
||||||
DGifSlurp(GifFileType * GifFile) {
|
|
||||||
|
|
||||||
int ImageSize;
|
|
||||||
GifRecordType RecordType;
|
|
||||||
SavedImage *sp;
|
|
||||||
GifByteType *ExtData;
|
|
||||||
SavedImage temp_save;
|
|
||||||
|
|
||||||
temp_save.ExtensionBlocks = NULL;
|
|
||||||
temp_save.ExtensionBlockCount = 0;
|
|
||||||
|
|
||||||
do {
|
|
||||||
if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
|
|
||||||
switch (RecordType) {
|
|
||||||
case IMAGE_DESC_RECORD_TYPE:
|
|
||||||
if (DGifGetImageDesc(GifFile) == GIF_ERROR)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
|
|
||||||
sp = &GifFile->SavedImages[GifFile->ImageCount - 1];
|
|
||||||
ImageSize = sp->ImageDesc.Width * sp->ImageDesc.Height;
|
|
||||||
|
|
||||||
sp->RasterBits = ungif_alloc(ImageSize * sizeof(GifPixelType));
|
|
||||||
if (sp->RasterBits == NULL) {
|
|
||||||
return GIF_ERROR;
|
|
||||||
}
|
|
||||||
if (DGifGetLine(GifFile, sp->RasterBits, ImageSize) ==
|
|
||||||
GIF_ERROR)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
if (temp_save.ExtensionBlocks) {
|
|
||||||
sp->ExtensionBlocks = temp_save.ExtensionBlocks;
|
|
||||||
sp->ExtensionBlockCount = temp_save.ExtensionBlockCount;
|
|
||||||
|
|
||||||
temp_save.ExtensionBlocks = NULL;
|
|
||||||
temp_save.ExtensionBlockCount = 0;
|
|
||||||
|
|
||||||
/* FIXME: The following is wrong. It is left in only for
|
|
||||||
* backwards compatibility. Someday it should go away. Use
|
|
||||||
* the sp->ExtensionBlocks->Function variable instead. */
|
|
||||||
sp->Function = sp->ExtensionBlocks[0].Function;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case EXTENSION_RECORD_TYPE:
|
|
||||||
if (DGifGetExtension(GifFile, &temp_save.Function, &ExtData) ==
|
|
||||||
GIF_ERROR)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
while (ExtData != NULL) {
|
|
||||||
|
|
||||||
/* Create an extension block with our data */
|
|
||||||
if (AddExtensionBlock(&temp_save, ExtData[0], &ExtData[1])
|
|
||||||
== GIF_ERROR)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
|
|
||||||
if (DGifGetExtensionNext(GifFile, &ExtData) == GIF_ERROR)
|
|
||||||
return (GIF_ERROR);
|
|
||||||
temp_save.Function = 0;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case TERMINATE_RECORD_TYPE:
|
|
||||||
break;
|
|
||||||
|
|
||||||
default: /* Should be trapped by DGifGetRecordType */
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
} while (RecordType != TERMINATE_RECORD_TYPE);
|
|
||||||
|
|
||||||
/* Just in case the Gif has an extension block without an associated
|
|
||||||
* image... (Should we save this into a savefile structure with no image
|
|
||||||
* instead? Have to check if the present writing code can handle that as
|
|
||||||
* well.... */
|
|
||||||
if (temp_save.ExtensionBlocks)
|
|
||||||
FreeExtension(&temp_save);
|
|
||||||
|
|
||||||
return (GIF_OK);
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* GifFileType constructor with user supplied input function (TVT)
|
|
||||||
*****************************************************************************/
|
|
||||||
GifFileType *
|
|
||||||
DGifOpen(void *userData,
|
|
||||||
InputFunc readFunc) {
|
|
||||||
|
|
||||||
unsigned char Buf[GIF_STAMP_LEN + 1];
|
|
||||||
GifFileType *GifFile;
|
|
||||||
GifFilePrivateType *Private;
|
|
||||||
|
|
||||||
GifFile = ungif_alloc(sizeof(GifFileType));
|
|
||||||
if (GifFile == NULL) {
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
memset(GifFile, '\0', sizeof(GifFileType));
|
|
||||||
|
|
||||||
Private = ungif_alloc(sizeof(GifFilePrivateType));
|
|
||||||
if (!Private) {
|
|
||||||
ungif_free(GifFile);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
GifFile->Private = (void*)Private;
|
|
||||||
|
|
||||||
Private->Read = readFunc; /* TVT */
|
|
||||||
GifFile->UserData = userData; /* TVT */
|
|
||||||
|
|
||||||
/* Lets see if this is a GIF file: */
|
|
||||||
if (READ(GifFile, Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) {
|
|
||||||
ungif_free(Private);
|
|
||||||
ungif_free(GifFile);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* The GIF Version number is ignored at this time. Maybe we should do
|
|
||||||
* something more useful with it. */
|
|
||||||
Buf[GIF_STAMP_LEN] = 0;
|
|
||||||
if (memcmp(GIF_STAMP, Buf, GIF_VERSION_POS) != 0) {
|
|
||||||
ungif_free(Private);
|
|
||||||
ungif_free(GifFile);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (DGifGetScreenDesc(GifFile) == GIF_ERROR) {
|
|
||||||
ungif_free(Private);
|
|
||||||
ungif_free(GifFile);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
return GifFile;
|
|
||||||
}
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* This routine should be called last, to close the GIF file.
|
|
||||||
*****************************************************************************/
|
|
||||||
int
|
|
||||||
DGifCloseFile(GifFileType * GifFile) {
|
|
||||||
|
|
||||||
GifFilePrivateType *Private;
|
|
||||||
|
|
||||||
if (GifFile == NULL)
|
|
||||||
return GIF_ERROR;
|
|
||||||
|
|
||||||
Private = GifFile->Private;
|
|
||||||
|
|
||||||
if (GifFile->Image.ColorMap) {
|
|
||||||
FreeMapObject(GifFile->Image.ColorMap);
|
|
||||||
GifFile->Image.ColorMap = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (GifFile->SColorMap) {
|
|
||||||
FreeMapObject(GifFile->SColorMap);
|
|
||||||
GifFile->SColorMap = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
ungif_free(Private);
|
|
||||||
Private = NULL;
|
|
||||||
|
|
||||||
if (GifFile->SavedImages) {
|
|
||||||
FreeSavedImages(GifFile);
|
|
||||||
GifFile->SavedImages = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
ungif_free(GifFile);
|
|
||||||
|
|
||||||
return GIF_OK;
|
|
||||||
}
|
|
|
@ -1,169 +0,0 @@
|
||||||
/*
|
|
||||||
* Gif extracting routines - derived from libungif
|
|
||||||
*
|
|
||||||
* Portions Copyright 2006 Mike McCormack
|
|
||||||
*
|
|
||||||
* This library is free software; you can redistribute it and/or
|
|
||||||
* modify it under the terms of the GNU Lesser General Public
|
|
||||||
* License as published by the Free Software Foundation; either
|
|
||||||
* version 2.1 of the License, or (at your option) any later version.
|
|
||||||
*
|
|
||||||
* This library is distributed in the hope that it will be useful,
|
|
||||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
||||||
* Lesser General Public License for more details.
|
|
||||||
*
|
|
||||||
* You should have received a copy of the GNU Lesser General Public
|
|
||||||
* License along with this library; if not, write to the Free Software
|
|
||||||
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
|
|
||||||
*/
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Original copyright notice:
|
|
||||||
*
|
|
||||||
* The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
|
|
||||||
*
|
|
||||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
||||||
* of this software and associated documentation files (the "Software"), to deal
|
|
||||||
* in the Software without restriction, including without limitation the rights
|
|
||||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
||||||
* copies of the Software, and to permit persons to whom the Software is
|
|
||||||
* furnished to do so, subject to the following conditions:
|
|
||||||
*
|
|
||||||
* The above copyright notice and this permission notice shall be included in
|
|
||||||
* all copies or substantial portions of the Software.
|
|
||||||
*/
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* In order to make life a little bit easier when using the GIF file format,
|
|
||||||
* this library was written, and which does all the dirty work...
|
|
||||||
*
|
|
||||||
* Written by Gershon Elber, Jun. 1989
|
|
||||||
* Hacks by Eric S. Raymond, Sep. 1992
|
|
||||||
******************************************************************************
|
|
||||||
* History:
|
|
||||||
* 14 Jun 89 - Version 1.0 by Gershon Elber.
|
|
||||||
* 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names)
|
|
||||||
* 15 Sep 90 - Version 2.0 by Eric S. Raymond (Changes to support GIF slurp)
|
|
||||||
* 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support)
|
|
||||||
* 17 Dec 98 - Version 4.0 by Toshio Kuratomi (Fix extension writing code)
|
|
||||||
*****************************************************************************/
|
|
||||||
|
|
||||||
#ifndef _UNGIF_H_
|
|
||||||
#define _UNGIF_H_ 1
|
|
||||||
|
|
||||||
#define GIF_ERROR 0
|
|
||||||
#define GIF_OK 1
|
|
||||||
|
|
||||||
#ifndef TRUE
|
|
||||||
#define TRUE 1
|
|
||||||
#endif /* TRUE */
|
|
||||||
#ifndef FALSE
|
|
||||||
#define FALSE 0
|
|
||||||
#endif /* FALSE */
|
|
||||||
|
|
||||||
#ifndef NULL
|
|
||||||
#define NULL 0
|
|
||||||
#endif /* NULL */
|
|
||||||
|
|
||||||
#define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
|
|
||||||
#define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
|
|
||||||
#define GIF_VERSION_POS 3 /* Version first character in stamp. */
|
|
||||||
#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
|
|
||||||
#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
|
|
||||||
|
|
||||||
#define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */
|
|
||||||
|
|
||||||
typedef int GifBooleanType;
|
|
||||||
typedef unsigned char GifPixelType;
|
|
||||||
typedef unsigned char *GifRowType;
|
|
||||||
typedef unsigned char GifByteType;
|
|
||||||
typedef unsigned int GifPrefixType;
|
|
||||||
typedef int GifWord;
|
|
||||||
|
|
||||||
typedef struct GifColorType {
|
|
||||||
GifByteType Red, Green, Blue;
|
|
||||||
} GifColorType;
|
|
||||||
|
|
||||||
typedef struct ColorMapObject {
|
|
||||||
int ColorCount;
|
|
||||||
int BitsPerPixel;
|
|
||||||
GifColorType *Colors;
|
|
||||||
} ColorMapObject;
|
|
||||||
|
|
||||||
typedef struct GifImageDesc {
|
|
||||||
GifWord Left, Top, Width, Height, /* Current image dimensions. */
|
|
||||||
Interlace; /* Sequential/Interlaced lines. */
|
|
||||||
ColorMapObject *ColorMap; /* The local color map */
|
|
||||||
} GifImageDesc;
|
|
||||||
|
|
||||||
typedef struct GifFileType {
|
|
||||||
GifWord SWidth, SHeight, /* Screen dimensions. */
|
|
||||||
SColorResolution, /* How many colors can we generate? */
|
|
||||||
SBackGroundColor; /* I hope you understand this one... */
|
|
||||||
ColorMapObject *SColorMap; /* NULL if not exists. */
|
|
||||||
int ImageCount; /* Number of current image */
|
|
||||||
GifImageDesc Image; /* Block describing current image */
|
|
||||||
struct SavedImage *SavedImages; /* Use this to accumulate file state */
|
|
||||||
void *UserData; /* hook to attach user data (TVT) */
|
|
||||||
void *Private; /* Don't mess with this! */
|
|
||||||
} GifFileType;
|
|
||||||
|
|
||||||
typedef enum {
|
|
||||||
UNDEFINED_RECORD_TYPE,
|
|
||||||
SCREEN_DESC_RECORD_TYPE,
|
|
||||||
IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
|
|
||||||
EXTENSION_RECORD_TYPE, /* Begin with '!' */
|
|
||||||
TERMINATE_RECORD_TYPE /* Begin with ';' */
|
|
||||||
} GifRecordType;
|
|
||||||
|
|
||||||
/* func type to read gif data from arbitrary sources (TVT) */
|
|
||||||
typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
|
|
||||||
|
|
||||||
/* GIF89 extension function codes */
|
|
||||||
|
|
||||||
#define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
|
|
||||||
#define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control */
|
|
||||||
#define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
|
|
||||||
#define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
|
|
||||||
|
|
||||||
/* public interface to ungif.c */
|
|
||||||
int DGifSlurp(GifFileType * GifFile);
|
|
||||||
GifFileType *DGifOpen(void *userPtr, InputFunc readFunc);
|
|
||||||
int DGifCloseFile(GifFileType * GifFile);
|
|
||||||
|
|
||||||
#define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
|
|
||||||
#define D_GIF_ERR_READ_FAILED 102
|
|
||||||
#define D_GIF_ERR_NOT_GIF_FILE 103
|
|
||||||
#define D_GIF_ERR_NO_SCRN_DSCR 104
|
|
||||||
#define D_GIF_ERR_NO_IMAG_DSCR 105
|
|
||||||
#define D_GIF_ERR_NO_COLOR_MAP 106
|
|
||||||
#define D_GIF_ERR_WRONG_RECORD 107
|
|
||||||
#define D_GIF_ERR_DATA_TOO_BIG 108
|
|
||||||
#define D_GIF_ERR_NOT_ENOUGH_MEM 109
|
|
||||||
#define D_GIF_ERR_CLOSE_FAILED 110
|
|
||||||
#define D_GIF_ERR_NOT_READABLE 111
|
|
||||||
#define D_GIF_ERR_IMAGE_DEFECT 112
|
|
||||||
#define D_GIF_ERR_EOF_TOO_SOON 113
|
|
||||||
|
|
||||||
/******************************************************************************
|
|
||||||
* Support for the in-core structures allocation (slurp mode).
|
|
||||||
*****************************************************************************/
|
|
||||||
|
|
||||||
/* This is the in-core version of an extension record */
|
|
||||||
typedef struct {
|
|
||||||
int ByteCount;
|
|
||||||
char *Bytes;
|
|
||||||
int Function; /* Holds the type of the Extension block. */
|
|
||||||
} ExtensionBlock;
|
|
||||||
|
|
||||||
/* This holds an image header, its unpacked raster bits, and extensions */
|
|
||||||
typedef struct SavedImage {
|
|
||||||
GifImageDesc ImageDesc;
|
|
||||||
unsigned char *RasterBits;
|
|
||||||
int Function; /* DEPRECATED: Use ExtensionBlocks[x].Function instead */
|
|
||||||
int ExtensionBlockCount;
|
|
||||||
ExtensionBlock *ExtensionBlocks;
|
|
||||||
} SavedImage;
|
|
||||||
|
|
||||||
#endif /* _UNGIF_H_ */
|
|
Loading…
Reference in New Issue