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oleaut32: Use WIC to decode gif files.

This commit is contained in:
Vincent Povirk 2009-07-09 15:03:22 -05:00 committed by Alexandre Julliard
parent 19e7803088
commit 7c9e198a71
5 changed files with 180 additions and 1387 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
dlls/oleaut32/Makefile.in
View File

@ -5,7 +5,7 @@ VPATH = @srcdir@
MODULE = oleaut32.dll
IMPORTLIB = oleaut32
IMPORTS = uuid ole32 rpcrt4 user32 gdi32 advapi32 kernel32 ntdll
DELAYIMPORTS = comctl32 urlmon
DELAYIMPORTS = comctl32 urlmon windowscodecs
EXTRADEFS = -D_OLEAUT32_ -DCOM_NO_WINDOWS_H \
-DENTRY_PREFIX=OLEAUTPS_ -DPROXY_CLSID=CLSID_PSDispatch -DPROXY_DELEGATION -DREGISTER_PROXY_DLL
EXTRAINCL = @PNGINCL@
@ -24,7 +24,6 @@ C_SRCS = \
tmarshal.c \
typelib.c \
typelib2.c \
ungif.c \
usrmarshal.c \
varformat.c \
variant.c \

395
dlls/oleaut32/olepicture.c
View File

@ -82,12 +82,11 @@
#include "oleauto.h"
#include "connpt.h"
#include "urlmon.h"
#include "wincodec.h"
#include "wine/debug.h"
#include "wine/unicode.h"
#include "wine/library.h"
#include "ungif.h"
WINE_DEFAULT_DEBUG_CHANNEL(ole);
#include "pshpack1.h"
@ -1059,220 +1058,6 @@ static jpeg_boolean _jpeg_resync_to_restart(j_decompress_ptr cinfo, int desired)
static void _jpeg_term_source(j_decompress_ptr cinfo) { }
#endif /* SONAME_LIBJPEG */
struct gifdata {
unsigned char *data;
unsigned int curoff;
unsigned int len;
};
static int _gif_inputfunc(GifFileType *gif, GifByteType *data, int len) {
struct gifdata *gd = gif->UserData;
if (len+gd->curoff > gd->len) {
ERR("Trying to read %d bytes, but only %d available.\n",len, gd->len-gd->curoff);
len = gd->len - gd->curoff;
}
memcpy(data, gd->data+gd->curoff, len);
gd->curoff += len;
return len;
}
static HRESULT OLEPictureImpl_LoadGif(OLEPictureImpl *This, BYTE *xbuf, ULONG xread)
{
struct gifdata gd;
GifFileType *gif;
BITMAPINFO *bmi;
HDC hdcref;
LPBYTE bytes;
int i,j,ret;
GifImageDesc *gid;
SavedImage *si;
ColorMapObject *cm;
int transparent = -1;
ExtensionBlock *eb;
int padding;
gd.data = xbuf;
gd.curoff = 0;
gd.len = xread;
gif = DGifOpen((void*)&gd, _gif_inputfunc);
ret = DGifSlurp(gif);
if (ret == GIF_ERROR) {
ERR("Failed reading GIF using libgif.\n");
return E_FAIL;
}
TRACE("screen height %d, width %d\n", gif->SWidth, gif->SHeight);
TRACE("color res %d, backgcolor %d\n", gif->SColorResolution, gif->SBackGroundColor);
TRACE("imgcnt %d\n", gif->ImageCount);
if (gif->ImageCount<1) {
ERR("GIF stream does not have images inside?\n");
return E_FAIL;
}
TRACE("curimage: %d x %d, on %dx%d, interlace %d\n",
gif->Image.Width, gif->Image.Height,
gif->Image.Left, gif->Image.Top,
gif->Image.Interlace
);
/* */
padding = (gif->SWidth+3) & ~3;
si = gif->SavedImages+0;
gid = &(si->ImageDesc);
cm = gid->ColorMap;
if (!cm) cm = gif->SColorMap;
bmi = HeapAlloc(GetProcessHeap(),0,sizeof(BITMAPINFOHEADER)+(cm->ColorCount)*sizeof(RGBQUAD));
bytes= HeapAlloc(GetProcessHeap(),0,padding*gif->SHeight);
/* look for the transparent color extension */
for (i = 0; i < si->ExtensionBlockCount; ++i) {
eb = si->ExtensionBlocks + i;
if (eb->Function == 0xF9 && eb->ByteCount == 4) {
if ((eb->Bytes[0] & 1) == 1) {
transparent = (unsigned char)eb->Bytes[3];
}
}
}
for (i = 0; i < cm->ColorCount; i++) {
bmi->bmiColors[i].rgbRed = cm->Colors[i].Red;
bmi->bmiColors[i].rgbGreen = cm->Colors[i].Green;
bmi->bmiColors[i].rgbBlue = cm->Colors[i].Blue;
if (i == transparent) {
This->rgbTrans = RGB(bmi->bmiColors[i].rgbRed,
bmi->bmiColors[i].rgbGreen,
bmi->bmiColors[i].rgbBlue);
}
}
/* Map to in picture coordinates */
for (i = 0, j = 0; i < gid->Height; i++) {
if (gif->Image.Interlace) {
memcpy(
bytes + (gid->Top + j) * padding + gid->Left,
si->RasterBits + i * gid->Width,
gid->Width);
/* Lower bits of interlaced counter encode current interlace */
if (j & 1) j += 2; /* Currently filling odd rows */
else if (j & 2) j += 4; /* Currently filling even rows not multiples of 4 */
else j += 8; /* Currently filling every 8th row or 4th row in-between */
if (j >= gid->Height && i < gid->Height && (j & 1) == 0) {
/* End of current interlace, go to next interlace */
if (j & 2) j = 1; /* Next iteration fills odd rows */
else if (j & 4) j = 2; /* Next iteration fills even rows not mod 4 and not mod 8 */
else j = 4; /* Next iteration fills rows in-between rows mod 6 */
}
} else {
memcpy(
bytes + (gid->Top + i) * padding + gid->Left,
si->RasterBits + i * gid->Width,
gid->Width);
}
}
bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi->bmiHeader.biWidth = gif->SWidth;
bmi->bmiHeader.biHeight = -gif->SHeight;
bmi->bmiHeader.biPlanes = 1;
bmi->bmiHeader.biBitCount = 8;
bmi->bmiHeader.biCompression = BI_RGB;
bmi->bmiHeader.biSizeImage = padding*gif->SHeight;
bmi->bmiHeader.biXPelsPerMeter = 0;
bmi->bmiHeader.biYPelsPerMeter = 0;
bmi->bmiHeader.biClrUsed = cm->ColorCount;
bmi->bmiHeader.biClrImportant = 0;
hdcref = GetDC(0);
This->desc.u.bmp.hbitmap=CreateDIBitmap(
hdcref,
&bmi->bmiHeader,
CBM_INIT,
bytes,
bmi,
DIB_RGB_COLORS
);
if (transparent > -1) {
/* Create the Mask */
HDC hdc = CreateCompatibleDC(0);
HDC hdcMask = CreateCompatibleDC(0);
HBITMAP hOldbitmap;
HBITMAP hOldbitmapmask;
unsigned int monopadding = (((unsigned)(gif->SWidth + 31)) >> 5) << 2;
HBITMAP hTempMask;
This->hbmXor = CreateDIBitmap(
hdcref,
&bmi->bmiHeader,
CBM_INIT,
bytes,
bmi,
DIB_RGB_COLORS
);
bmi->bmiColors[0].rgbRed = 0;
bmi->bmiColors[0].rgbGreen = 0;
bmi->bmiColors[0].rgbBlue = 0;
bmi->bmiColors[1].rgbRed = 255;
bmi->bmiColors[1].rgbGreen = 255;
bmi->bmiColors[1].rgbBlue = 255;
bmi->bmiHeader.biBitCount = 1;
bmi->bmiHeader.biSizeImage = monopadding*gif->SHeight;
bmi->bmiHeader.biClrUsed = 2;
for (i = 0; i < gif->SHeight; i++) {
unsigned char * colorPointer = bytes + padding * i;
unsigned char * monoPointer = bytes + monopadding * i;
for (j = 0; j < gif->SWidth; j++) {
unsigned char pixel = colorPointer[j];
if ((j & 7) == 0) monoPointer[j >> 3] = 0;
if (pixel == (transparent & 0x000000FFU)) monoPointer[j >> 3] |= 1 << (7 - (j & 7));
}
}
hTempMask = CreateDIBitmap(
hdcref,
&bmi->bmiHeader,
CBM_INIT,
bytes,
bmi,
DIB_RGB_COLORS
);
bmi->bmiHeader.biHeight = -bmi->bmiHeader.biHeight;
This->hbmMask = CreateBitmap(bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight, 1, 1, NULL);
hOldbitmap = SelectObject(hdc, hTempMask);
hOldbitmapmask = SelectObject(hdcMask, This->hbmMask);
SetBkColor(hdc, RGB(255, 255, 255));
BitBlt(hdcMask, 0, 0, bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight, hdc, 0, 0, SRCCOPY);
/* We no longer need the original bitmap, so we apply the first
transformation with the mask to speed up the rendering */
SelectObject(hdc, This->hbmXor);
SetBkColor(hdc, RGB(0,0,0));
SetTextColor(hdc, RGB(255,255,255));
BitBlt(hdc, 0, 0, bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight,
hdcMask, 0, 0, SRCAND);
SelectObject(hdc, hOldbitmap);
SelectObject(hdcMask, hOldbitmapmask);
DeleteDC(hdcMask);
DeleteDC(hdc);
DeleteObject(hTempMask);
}
ReleaseDC(0, hdcref);
This->desc.picType = PICTYPE_BITMAP;
OLEPictureImpl_SetBitmap(This);
DGifCloseFile(gif);
HeapFree(GetProcessHeap(),0,bmi);
HeapFree(GetProcessHeap(),0,bytes);
return S_OK;
}
static HRESULT OLEPictureImpl_LoadJpeg(OLEPictureImpl *This, BYTE *xbuf, ULONG xread)
{
#ifdef SONAME_LIBJPEG
@ -1404,6 +1189,182 @@ static HRESULT OLEPictureImpl_LoadDIB(OLEPictureImpl *This, BYTE *xbuf, ULONG xr
return S_OK;
}
static HRESULT OLEPictureImpl_LoadWICSource(OLEPictureImpl *This, IWICBitmapSource *src)
{
HRESULT hr;
BITMAPINFOHEADER bih;
HDC hdcref;
UINT width, height;
UINT stride, buffersize;
LPBYTE bits=NULL;
WICRect rc;
IWICBitmapSource *real_source;
UINT x, y;
COLORREF white = RGB(255, 255, 255), black = RGB(0, 0, 0);
BOOL has_alpha=FALSE;
hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA, src, &real_source);
if (FAILED(hr)) return hr;
hr = IWICBitmapSource_GetSize(real_source, &width, &height);
if (FAILED(hr)) goto end;
bih.biSize = sizeof(bih);
bih.biWidth = width;
bih.biHeight = -height;
bih.biPlanes = 1;
bih.biBitCount = 32;
bih.biCompression = BI_RGB;
bih.biSizeImage = 0;
bih.biXPelsPerMeter = 4085; /* olepicture ignores the stored resolution */
bih.biYPelsPerMeter = 4085;
bih.biClrUsed = 0;
bih.biClrImportant = 0;
stride = 4 * width;
buffersize = stride * height;
bits = HeapAlloc(GetProcessHeap(), 0, buffersize);
if (!bits)
{
hr = E_OUTOFMEMORY;
goto end;
}
rc.X = 0;
rc.Y = 0;
rc.Width = width;
rc.Height = height;
hr = IWICBitmapSource_CopyPixels(real_source, &rc, stride, buffersize, bits);
if (FAILED(hr))
goto end;
hdcref = GetDC(0);
This->desc.u.bmp.hbitmap = CreateDIBitmap(
hdcref,
&bih,
CBM_INIT,
bits,
(BITMAPINFO*)&bih,
DIB_RGB_COLORS);
if (This->desc.u.bmp.hbitmap == 0)
{
hr = E_FAIL;
ReleaseDC(0, hdcref);
goto end;
}
This->desc.picType = PICTYPE_BITMAP;
OLEPictureImpl_SetBitmap(This);
/* set transparent pixels to black, all others to white */
for(y = 0; y < height; y++){
for(x = 0; x < width; x++){
DWORD *pixel = (DWORD*)(bits + stride*y + 4*x);
if((*pixel & 0x80000000) == 0)
{
has_alpha = TRUE;
*pixel = black;
}
else
*pixel = white;
}
}
if (has_alpha)
{
HDC hdcBmp, hdcXor, hdcMask;
HBITMAP hbmoldBmp, hbmoldXor, hbmoldMask;
This->hbmXor = CreateDIBitmap(
hdcref,
&bih,
CBM_INIT,
bits,
(BITMAPINFO*)&bih,
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
* currently only supports colortype PNG_COLOR_TYPE_RGB
@ -1925,7 +1886,7 @@ static HRESULT WINAPI OLEPictureImpl_Load(IPersistStream* iface,IStream*pStm) {
switch (magic) {
case BITMAP_FORMAT_GIF: /* GIF */
hr = OLEPictureImpl_LoadGif(This, xbuf, xread);
hr = OLEPictureImpl_LoadWICDecoder(This, &CLSID_WICGifDecoder, xbuf, xread);
break;
case BITMAP_FORMAT_JPEG: /* JPEG */
hr = OLEPictureImpl_LoadJpeg(This, xbuf, xread);

1
dlls/oleaut32/regsvr.c
View File

@ -32,6 +32,7 @@
#include "oleauto.h"
#include "initguid.h"
#include "typelib.h"
#include "wincodec.h"
#include "wine/debug.h"
#include "wine/unicode.h"

999
dlls/oleaut32/ungif.c
View File

@ -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;
}

169
dlls/oleaut32/ungif.h
View File

@ -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_ */