dlls/windowscodecs/gifformat.c

   1 /*
   2  * Copyright 2009 Vincent Povirk for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdarg.h>
  22
  23 #define COBJMACROS
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "objbase.h"
  28 #include "wincodec.h"
  29
  30 #include "ungif.h"
  31
  32 #include "wincodecs_private.h"
  33
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  37
  38 typedef struct {
  39     const IWICBitmapDecoderVtbl *lpVtbl;
  40     LONG ref;
  41     BOOL initialized;
  42     GifFileType *gif;
  43 } GifDecoder;
  44
  45 static HRESULT WINAPI GifDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
  46     void **ppv)
  47 {
  48     GifDecoder *This = (GifDecoder*)iface;
  49     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
  50
  51     if (!ppv) return E_INVALIDARG;
  52
  53     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
  54     {
  55         *ppv = This;
  56     }
  57     else
  58     {
  59         *ppv = NULL;
  60         return E_NOINTERFACE;
  61     }
  62
  63     IUnknown_AddRef((IUnknown*)*ppv);
  64     return S_OK;
  65 }
  66
  67 static ULONG WINAPI GifDecoder_AddRef(IWICBitmapDecoder *iface)
  68 {
  69     GifDecoder *This = (GifDecoder*)iface;
  70     ULONG ref = InterlockedIncrement(&This->ref);
  71
  72     TRACE("(%p) refcount=%u\n", iface, ref);
  73
  74     return ref;
  75 }
  76
  77 static ULONG WINAPI GifDecoder_Release(IWICBitmapDecoder *iface)
  78 {
  79     GifDecoder *This = (GifDecoder*)iface;
  80     ULONG ref = InterlockedDecrement(&This->ref);
  81
  82     TRACE("(%p) refcount=%u\n", iface, ref);
  83
  84     if (ref == 0)
  85     {
  86         DGifCloseFile(This->gif);
  87         HeapFree(GetProcessHeap(), 0, This);
  88     }
  89
  90     return ref;
  91 }
  92
  93 static HRESULT WINAPI GifDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
  94     DWORD *pdwCapability)
  95 {
  96     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
  97     return E_NOTIMPL;
  98 }
  99
 100 static int _gif_inputfunc(GifFileType *gif, GifByteType *data, int len) {
 101     IStream *stream = gif->UserData;
 102     ULONG bytesread;
 103     HRESULT hr;
 104
 105     if (!stream)
 106     {
 107         ERR("attempting to read file after initialization\n");
 108         return 0;
 109     }
 110
 111     hr = IStream_Read(stream, data, len, &bytesread);
 112     if (hr != S_OK) bytesread = 0;
 113     return bytesread;
 114 }
 115
 116 static HRESULT WINAPI GifDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 117     WICDecodeOptions cacheOptions)
 118 {
 119     GifDecoder *This = (GifDecoder*)iface;
 120     LARGE_INTEGER seek;
 121     int ret;
 122
 123     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 124
 125     if (This->initialized || This->gif)
 126     {
 127         WARN("already initialized\n");
 128         return WINCODEC_ERR_WRONGSTATE;
 129     }
 130
 131     /* seek to start of stream */
 132     seek.QuadPart = 0;
 133     IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 134
 135     /* read all data from the stream */
 136     This->gif = DGifOpen((void*)pIStream, _gif_inputfunc);
 137     if (!This->gif) return E_FAIL;
 138
 139     ret = DGifSlurp(This->gif);
 140     if (ret == GIF_ERROR) return E_FAIL;
 141
 142     /* make sure we don't use the stream after this method returns */
 143     This->gif->UserData = NULL;
 144
 145     This->initialized = TRUE;
 146
 147     return S_OK;
 148 }
 149
 150 static HRESULT WINAPI GifDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 151     GUID *pguidContainerFormat)
 152 {
 153     FIXME("(%p,%s): stub\n", iface, debugstr_guid(pguidContainerFormat));
 154     return E_NOTIMPL;
 155 }
 156
 157 static HRESULT WINAPI GifDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 158     IWICBitmapDecoderInfo **ppIDecoderInfo)
 159 {
 160     FIXME("(%p,%p): stub\n", iface, ppIDecoderInfo);
 161     return E_NOTIMPL;
 162 }
 163
 164 static HRESULT WINAPI GifDecoder_CopyPalette(IWICBitmapDecoder *iface,
 165     IWICPalette *pIPalette)
 166 {
 167     TRACE("(%p,%p)\n", iface, pIPalette);
 168     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 169 }
 170
 171 static HRESULT WINAPI GifDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 172     IWICMetadataQueryReader **ppIMetadataQueryReader)
 173 {
 174     TRACE("(%p,%p)\n", iface, ppIMetadataQueryReader);
 175     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 176 }
 177
 178 static HRESULT WINAPI GifDecoder_GetPreview(IWICBitmapDecoder *iface,
 179     IWICBitmapSource **ppIBitmapSource)
 180 {
 181     TRACE("(%p,%p)\n", iface, ppIBitmapSource);
 182     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 183 }
 184
 185 static HRESULT WINAPI GifDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 186     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 187 {
 188     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 189     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 190 }
 191
 192 static HRESULT WINAPI GifDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 193     IWICBitmapSource **ppIThumbnail)
 194 {
 195     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 196     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 197 }
 198
 199 static HRESULT WINAPI GifDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 200     UINT *pCount)
 201 {
 202     FIXME("(%p,%p): stub\n", iface, pCount);
 203     return E_NOTIMPL;
 204 }
 205
 206 static HRESULT WINAPI GifDecoder_GetFrame(IWICBitmapDecoder *iface,
 207     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 208 {
 209     FIXME("(%p,%u,%p): stub\n", iface, index, ppIBitmapFrame);
 210     return E_NOTIMPL;
 211 }
 212
 213 static const IWICBitmapDecoderVtbl GifDecoder_Vtbl = {
 214     GifDecoder_QueryInterface,
 215     GifDecoder_AddRef,
 216     GifDecoder_Release,
 217     GifDecoder_QueryCapability,
 218     GifDecoder_Initialize,
 219     GifDecoder_GetContainerFormat,
 220     GifDecoder_GetDecoderInfo,
 221     GifDecoder_CopyPalette,
 222     GifDecoder_GetMetadataQueryReader,
 223     GifDecoder_GetPreview,
 224     GifDecoder_GetColorContexts,
 225     GifDecoder_GetThumbnail,
 226     GifDecoder_GetFrameCount,
 227     GifDecoder_GetFrame
 228 };
 229
 230 HRESULT GifDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 231 {
 232     GifDecoder *This;
 233     HRESULT ret;
 234
 235     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 236
 237     *ppv = NULL;
 238
 239     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 240
 241     This = HeapAlloc(GetProcessHeap(), 0, sizeof(GifDecoder));
 242     if (!This) return E_OUTOFMEMORY;
 243
 244     This->lpVtbl = &GifDecoder_Vtbl;
 245     This->ref = 1;
 246     This->initialized = FALSE;
 247     This->gif = NULL;
 248
 249     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
 250     IUnknown_Release((IUnknown*)This);
 251
 252     return ret;
 253 }