dlls/windowscodecs/jpegformat.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 #include "wine/port.h"
  21
  22 #ifdef HAVE_UNISTD_H
  23 # include <unistd.h>
  24 #endif
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <setjmp.h>
  29
  30 #ifdef SONAME_LIBJPEG
  31 /* This is a hack, so jpeglib.h does not redefine INT32 and the like*/
  32 #define XMD_H
  33 #define UINT8 JPEG_UINT8
  34 #define UINT16 JPEG_UINT16
  35 #define boolean jpeg_boolean
  36 #undef HAVE_STDLIB_H
  37 # include <jpeglib.h>
  38 #undef HAVE_STDLIB_H
  39 #define HAVE_STDLIB_H 1
  40 #undef UINT8
  41 #undef UINT16
  42 #undef boolean
  43 #endif
  44
  45 #define COBJMACROS
  46
  47 #include "windef.h"
  48 #include "winbase.h"
  49 #include "objbase.h"
  50 #include "wincodec.h"
  51
  52 #include "wincodecs_private.h"
  53
  54 #include "wine/debug.h"
  55 #include "wine/library.h"
  56
  57 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  58
  59 #ifdef SONAME_LIBJPEG
  60 WINE_DECLARE_DEBUG_CHANNEL(jpeg);
  61
  62 static void *libjpeg_handle;
  63
  64 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
  65 MAKE_FUNCPTR(jpeg_CreateDecompress);
  66 MAKE_FUNCPTR(jpeg_destroy_decompress);
  67 MAKE_FUNCPTR(jpeg_read_header);
  68 MAKE_FUNCPTR(jpeg_read_scanlines);
  69 MAKE_FUNCPTR(jpeg_resync_to_restart);
  70 MAKE_FUNCPTR(jpeg_start_decompress);
  71 MAKE_FUNCPTR(jpeg_std_error);
  72 #undef MAKE_FUNCPTR
  73
  74 static void *load_libjpeg(void)
  75 {
  76     if((libjpeg_handle = wine_dlopen(SONAME_LIBJPEG, RTLD_NOW, NULL, 0)) != NULL) {
  77
  78 #define LOAD_FUNCPTR(f) \
  79     if((p##f = wine_dlsym(libjpeg_handle, #f, NULL, 0)) == NULL) { \
  80         libjpeg_handle = NULL; \
  81         return NULL; \
  82     }
  83
  84         LOAD_FUNCPTR(jpeg_CreateDecompress);
  85         LOAD_FUNCPTR(jpeg_destroy_decompress);
  86         LOAD_FUNCPTR(jpeg_read_header);
  87         LOAD_FUNCPTR(jpeg_read_scanlines);
  88         LOAD_FUNCPTR(jpeg_resync_to_restart);
  89         LOAD_FUNCPTR(jpeg_start_decompress);
  90         LOAD_FUNCPTR(jpeg_std_error);
  91 #undef LOAD_FUNCPTR
  92     }
  93     return libjpeg_handle;
  94 }
  95
  96 static void error_exit_fn(j_common_ptr cinfo)
  97 {
  98     char message[JMSG_LENGTH_MAX];
  99     if (ERR_ON(jpeg))
 100     {
 101         cinfo->err->format_message(cinfo, message);
 102         ERR_(jpeg)("%s\n", message);
 103     }
 104     longjmp(*(jmp_buf*)cinfo->client_data, 1);
 105 }
 106
 107 static void emit_message_fn(j_common_ptr cinfo, int msg_level)
 108 {
 109     char message[JMSG_LENGTH_MAX];
 110
 111     if (msg_level < 0 && ERR_ON(jpeg))
 112     {
 113         cinfo->err->format_message(cinfo, message);
 114         ERR_(jpeg)("%s\n", message);
 115     }
 116     else if (msg_level == 0 && WARN_ON(jpeg))
 117     {
 118         cinfo->err->format_message(cinfo, message);
 119         WARN_(jpeg)("%s\n", message);
 120     }
 121     else if (msg_level > 0 && TRACE_ON(jpeg))
 122     {
 123         cinfo->err->format_message(cinfo, message);
 124         TRACE_(jpeg)("%s\n", message);
 125     }
 126 }
 127
 128 typedef struct {
 129     IWICBitmapDecoder IWICBitmapDecoder_iface;
 130     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
 131     LONG ref;
 132     BOOL initialized;
 133     BOOL cinfo_initialized;
 134     IStream *stream;
 135     struct jpeg_decompress_struct cinfo;
 136     struct jpeg_error_mgr jerr;
 137     struct jpeg_source_mgr source_mgr;
 138     BYTE source_buffer[1024];
 139     BYTE *image_data;
 140     CRITICAL_SECTION lock;
 141 } JpegDecoder;
 142
 143 static inline JpegDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
 144 {
 145     return CONTAINING_RECORD(iface, JpegDecoder, IWICBitmapDecoder_iface);
 146 }
 147
 148 static inline JpegDecoder *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
 149 {
 150     return CONTAINING_RECORD(iface, JpegDecoder, IWICBitmapFrameDecode_iface);
 151 }
 152
 153 static inline JpegDecoder *decoder_from_decompress(j_decompress_ptr decompress)
 154 {
 155     return CONTAINING_RECORD(decompress, JpegDecoder, cinfo);
 156 }
 157
 158 static HRESULT WINAPI JpegDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 159     void **ppv)
 160 {
 161     JpegDecoder *This = impl_from_IWICBitmapDecoder(iface);
 162     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 163
 164     if (!ppv) return E_INVALIDARG;
 165
 166     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 167     {
 168         *ppv = This;
 169     }
 170     else
 171     {
 172         *ppv = NULL;
 173         return E_NOINTERFACE;
 174     }
 175
 176     IUnknown_AddRef((IUnknown*)*ppv);
 177     return S_OK;
 178 }
 179
 180 static ULONG WINAPI JpegDecoder_AddRef(IWICBitmapDecoder *iface)
 181 {
 182     JpegDecoder *This = impl_from_IWICBitmapDecoder(iface);
 183     ULONG ref = InterlockedIncrement(&This->ref);
 184
 185     TRACE("(%p) refcount=%u\n", iface, ref);
 186
 187     return ref;
 188 }
 189
 190 static ULONG WINAPI JpegDecoder_Release(IWICBitmapDecoder *iface)
 191 {
 192     JpegDecoder *This = impl_from_IWICBitmapDecoder(iface);
 193     ULONG ref = InterlockedDecrement(&This->ref);
 194
 195     TRACE("(%p) refcount=%u\n", iface, ref);
 196
 197     if (ref == 0)
 198     {
 199         This->lock.DebugInfo->Spare[0] = 0;
 200         DeleteCriticalSection(&This->lock);
 201         if (This->cinfo_initialized) pjpeg_destroy_decompress(&This->cinfo);
 202         if (This->stream) IStream_Release(This->stream);
 203         HeapFree(GetProcessHeap(), 0, This->image_data);
 204         HeapFree(GetProcessHeap(), 0, This);
 205     }
 206
 207     return ref;
 208 }
 209
 210 static HRESULT WINAPI JpegDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 211     DWORD *pdwCapability)
 212 {
 213     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
 214     return E_NOTIMPL;
 215 }
 216
 217 static void source_mgr_init_source(j_decompress_ptr cinfo)
 218 {
 219 }
 220
 221 static jpeg_boolean source_mgr_fill_input_buffer(j_decompress_ptr cinfo)
 222 {
 223     JpegDecoder *This = decoder_from_decompress(cinfo);
 224     HRESULT hr;
 225     ULONG bytesread;
 226
 227     hr = IStream_Read(This->stream, This->source_buffer, 1024, &bytesread);
 228
 229     if (hr != S_OK || bytesread == 0)
 230     {
 231         return FALSE;
 232     }
 233     else
 234     {
 235         This->source_mgr.next_input_byte = This->source_buffer;
 236         This->source_mgr.bytes_in_buffer = bytesread;
 237         return TRUE;
 238     }
 239 }
 240
 241 static void source_mgr_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
 242 {
 243     JpegDecoder *This = decoder_from_decompress(cinfo);
 244     LARGE_INTEGER seek;
 245
 246     if (num_bytes > This->source_mgr.bytes_in_buffer)
 247     {
 248         seek.QuadPart = num_bytes - This->source_mgr.bytes_in_buffer;
 249         IStream_Seek(This->stream, seek, STREAM_SEEK_CUR, NULL);
 250         This->source_mgr.bytes_in_buffer = 0;
 251     }
 252     else if (num_bytes > 0)
 253     {
 254         This->source_mgr.next_input_byte += num_bytes;
 255         This->source_mgr.bytes_in_buffer -= num_bytes;
 256     }
 257 }
 258
 259 static void source_mgr_term_source(j_decompress_ptr cinfo)
 260 {
 261 }
 262
 263 static HRESULT WINAPI JpegDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 264     WICDecodeOptions cacheOptions)
 265 {
 266     JpegDecoder *This = impl_from_IWICBitmapDecoder(iface);
 267     int ret;
 268     LARGE_INTEGER seek;
 269     jmp_buf jmpbuf;
 270     TRACE("(%p,%p,%u)\n", iface, pIStream, cacheOptions);
 271
 272     EnterCriticalSection(&This->lock);
 273
 274     if (This->cinfo_initialized)
 275     {
 276         LeaveCriticalSection(&This->lock);
 277         return WINCODEC_ERR_WRONGSTATE;
 278     }
 279
 280     pjpeg_std_error(&This->jerr);
 281
 282     This->jerr.error_exit = error_exit_fn;
 283     This->jerr.emit_message = emit_message_fn;
 284
 285     This->cinfo.err = &This->jerr;
 286
 287     This->cinfo.client_data = &jmpbuf;
 288
 289     if (setjmp(jmpbuf))
 290     {
 291         LeaveCriticalSection(&This->lock);
 292         return E_FAIL;
 293     }
 294
 295     pjpeg_CreateDecompress(&This->cinfo, JPEG_LIB_VERSION, sizeof(struct jpeg_decompress_struct));
 296
 297     This->cinfo_initialized = TRUE;
 298
 299     This->stream = pIStream;
 300     IStream_AddRef(pIStream);
 301
 302     seek.QuadPart = 0;
 303     IStream_Seek(This->stream, seek, STREAM_SEEK_SET, NULL);
 304
 305     This->source_mgr.bytes_in_buffer = 0;
 306     This->source_mgr.init_source = source_mgr_init_source;
 307     This->source_mgr.fill_input_buffer = source_mgr_fill_input_buffer;
 308     This->source_mgr.skip_input_data = source_mgr_skip_input_data;
 309     This->source_mgr.resync_to_restart = pjpeg_resync_to_restart;
 310     This->source_mgr.term_source = source_mgr_term_source;
 311
 312     This->cinfo.src = &This->source_mgr;
 313
 314     ret = pjpeg_read_header(&This->cinfo, TRUE);
 315
 316     if (ret != JPEG_HEADER_OK) {
 317         WARN("Jpeg image in stream has bad format, read header returned %d.\n",ret);
 318         LeaveCriticalSection(&This->lock);
 319         return E_FAIL;
 320     }
 321
 322     switch (This->cinfo.jpeg_color_space)
 323     {
 324     case JCS_GRAYSCALE:
 325         This->cinfo.out_color_space = JCS_GRAYSCALE;
 326         break;
 327     case JCS_RGB:
 328     case JCS_YCbCr:
 329         This->cinfo.out_color_space = JCS_RGB;
 330         break;
 331     case JCS_CMYK:
 332     case JCS_YCCK:
 333         This->cinfo.out_color_space = JCS_CMYK;
 334         break;
 335     default:
 336         ERR("Unknown JPEG color space %i\n", This->cinfo.jpeg_color_space);
 337         LeaveCriticalSection(&This->lock);
 338         return E_FAIL;
 339     }
 340
 341     if (!pjpeg_start_decompress(&This->cinfo))
 342     {
 343         ERR("jpeg_start_decompress failed\n");
 344         LeaveCriticalSection(&This->lock);
 345         return E_FAIL;
 346     }
 347
 348     This->initialized = TRUE;
 349
 350     LeaveCriticalSection(&This->lock);
 351
 352     return S_OK;
 353 }
 354
 355 static HRESULT WINAPI JpegDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 356     GUID *pguidContainerFormat)
 357 {
 358     memcpy(pguidContainerFormat, &GUID_ContainerFormatJpeg, sizeof(GUID));
 359     return S_OK;
 360 }
 361
 362 static HRESULT WINAPI JpegDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 363     IWICBitmapDecoderInfo **ppIDecoderInfo)
 364 {
 365     HRESULT hr;
 366     IWICComponentInfo *compinfo;
 367
 368     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 369
 370     hr = CreateComponentInfo(&CLSID_WICJpegDecoder, &compinfo);
 371     if (FAILED(hr)) return hr;
 372
 373     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 374         (void**)ppIDecoderInfo);
 375
 376     IWICComponentInfo_Release(compinfo);
 377
 378     return hr;
 379 }
 380
 381 static HRESULT WINAPI JpegDecoder_CopyPalette(IWICBitmapDecoder *iface,
 382     IWICPalette *pIPalette)
 383 {
 384     TRACE("(%p,%p)\n", iface, pIPalette);
 385
 386     return WINCODEC_ERR_PALETTEUNAVAILABLE;
 387 }
 388
 389 static HRESULT WINAPI JpegDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 390     IWICMetadataQueryReader **ppIMetadataQueryReader)
 391 {
 392     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 393     return E_NOTIMPL;
 394 }
 395
 396 static HRESULT WINAPI JpegDecoder_GetPreview(IWICBitmapDecoder *iface,
 397     IWICBitmapSource **ppIBitmapSource)
 398 {
 399     FIXME("(%p,%p): stub\n", iface, ppIBitmapSource);
 400     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 401 }
 402
 403 static HRESULT WINAPI JpegDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 404     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 405 {
 406     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
 407     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 408 }
 409
 410 static HRESULT WINAPI JpegDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 411     IWICBitmapSource **ppIThumbnail)
 412 {
 413     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 414     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 415 }
 416
 417 static HRESULT WINAPI JpegDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 418     UINT *pCount)
 419 {
 420     *pCount = 1;
 421     return S_OK;
 422 }
 423
 424 static HRESULT WINAPI JpegDecoder_GetFrame(IWICBitmapDecoder *iface,
 425     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 426 {
 427     JpegDecoder *This = impl_from_IWICBitmapDecoder(iface);
 428     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 429
 430     if (!This->initialized) return WINCODEC_ERR_NOTINITIALIZED;
 431
 432     if (index != 0) return E_INVALIDARG;
 433
 434     IWICBitmapDecoder_AddRef(iface);
 435     *ppIBitmapFrame = &This->IWICBitmapFrameDecode_iface;
 436
 437     return S_OK;
 438 }
 439
 440 static const IWICBitmapDecoderVtbl JpegDecoder_Vtbl = {
 441     JpegDecoder_QueryInterface,
 442     JpegDecoder_AddRef,
 443     JpegDecoder_Release,
 444     JpegDecoder_QueryCapability,
 445     JpegDecoder_Initialize,
 446     JpegDecoder_GetContainerFormat,
 447     JpegDecoder_GetDecoderInfo,
 448     JpegDecoder_CopyPalette,
 449     JpegDecoder_GetMetadataQueryReader,
 450     JpegDecoder_GetPreview,
 451     JpegDecoder_GetColorContexts,
 452     JpegDecoder_GetThumbnail,
 453     JpegDecoder_GetFrameCount,
 454     JpegDecoder_GetFrame
 455 };
 456
 457 static HRESULT WINAPI JpegDecoder_Frame_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
 458     void **ppv)
 459 {
 460     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 461
 462     if (!ppv) return E_INVALIDARG;
 463
 464     if (IsEqualIID(&IID_IUnknown, iid) ||
 465         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 466         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 467     {
 468         *ppv = iface;
 469     }
 470     else
 471     {
 472         *ppv = NULL;
 473         return E_NOINTERFACE;
 474     }
 475
 476     IUnknown_AddRef((IUnknown*)*ppv);
 477     return S_OK;
 478 }
 479
 480 static ULONG WINAPI JpegDecoder_Frame_AddRef(IWICBitmapFrameDecode *iface)
 481 {
 482     JpegDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 483     return IUnknown_AddRef((IUnknown*)This);
 484 }
 485
 486 static ULONG WINAPI JpegDecoder_Frame_Release(IWICBitmapFrameDecode *iface)
 487 {
 488     JpegDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 489     return IUnknown_Release((IUnknown*)This);
 490 }
 491
 492 static HRESULT WINAPI JpegDecoder_Frame_GetSize(IWICBitmapFrameDecode *iface,
 493     UINT *puiWidth, UINT *puiHeight)
 494 {
 495     JpegDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 496     *puiWidth = This->cinfo.output_width;
 497     *puiHeight = This->cinfo.output_height;
 498     TRACE("(%p)->(%u,%u)\n", iface, *puiWidth, *puiHeight);
 499     return S_OK;
 500 }
 501
 502 static HRESULT WINAPI JpegDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *iface,
 503     WICPixelFormatGUID *pPixelFormat)
 504 {
 505     JpegDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 506     TRACE("(%p,%p)\n", iface, pPixelFormat);
 507     if (This->cinfo.out_color_space == JCS_RGB)
 508         memcpy(pPixelFormat, &GUID_WICPixelFormat24bppBGR, sizeof(GUID));
 509     else if (This->cinfo.out_color_space == JCS_CMYK)
 510         memcpy(pPixelFormat, &GUID_WICPixelFormat32bppCMYK, sizeof(GUID));
 511     else /* This->cinfo.out_color_space == JCS_GRAYSCALE */
 512         memcpy(pPixelFormat, &GUID_WICPixelFormat8bppGray, sizeof(GUID));
 513     return S_OK;
 514 }
 515
 516 static HRESULT WINAPI JpegDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
 517     double *pDpiX, double *pDpiY)
 518 {
 519     FIXME("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
 520     return E_NOTIMPL;
 521 }
 522
 523 static HRESULT WINAPI JpegDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
 524     IWICPalette *pIPalette)
 525 {
 526     FIXME("(%p,%p): stub\n", iface, pIPalette);
 527     return E_NOTIMPL;
 528 }
 529
 530 static HRESULT WINAPI JpegDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
 531     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 532 {
 533     JpegDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 534     UINT bpp;
 535     UINT stride;
 536     UINT data_size;
 537     UINT max_row_needed;
 538     jmp_buf jmpbuf;
 539     WICRect rect;
 540     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 541
 542     if (!prc)
 543     {
 544         rect.X = 0;
 545         rect.Y = 0;
 546         rect.Width = This->cinfo.output_width;
 547         rect.Height = This->cinfo.output_height;
 548         prc = &rect;
 549     }
 550     else
 551     {
 552         if (prc->X < 0 || prc->Y < 0 || prc->X+prc->Width > This->cinfo.output_width ||
 553             prc->Y+prc->Height > This->cinfo.output_height)
 554             return E_INVALIDARG;
 555     }
 556
 557     if (This->cinfo.out_color_space == JCS_GRAYSCALE) bpp = 8;
 558     else if (This->cinfo.out_color_space == JCS_CMYK) bpp = 32;
 559     else bpp = 24;
 560
 561     stride = bpp * This->cinfo.output_width;
 562     data_size = stride * This->cinfo.output_height;
 563
 564     max_row_needed = prc->Y + prc->Height;
 565     if (max_row_needed > This->cinfo.output_height) return E_INVALIDARG;
 566
 567     EnterCriticalSection(&This->lock);
 568
 569     if (!This->image_data)
 570     {
 571         This->image_data = HeapAlloc(GetProcessHeap(), 0, data_size);
 572         if (!This->image_data)
 573         {
 574             LeaveCriticalSection(&This->lock);
 575             return E_OUTOFMEMORY;
 576         }
 577     }
 578
 579     This->cinfo.client_data = &jmpbuf;
 580
 581     if (setjmp(jmpbuf))
 582     {
 583         LeaveCriticalSection(&This->lock);
 584         return E_FAIL;
 585     }
 586
 587     while (max_row_needed > This->cinfo.output_scanline)
 588     {
 589         UINT first_scanline = This->cinfo.output_scanline;
 590         UINT max_rows;
 591         JSAMPROW out_rows[4];
 592         UINT i;
 593         JDIMENSION ret;
 594
 595         max_rows = min(This->cinfo.output_height-first_scanline, 4);
 596         for (i=0; i<max_rows; i++)
 597             out_rows[i] = This->image_data + stride * (first_scanline+i);
 598
 599         ret = pjpeg_read_scanlines(&This->cinfo, out_rows, max_rows);
 600
 601         if (ret == 0)
 602         {
 603             ERR("read_scanlines failed\n");
 604             LeaveCriticalSection(&This->lock);
 605             return E_FAIL;
 606         }
 607
 608         if (bpp == 24)
 609         {
 610             /* libjpeg gives us RGB data and we want BGR, so byteswap the data */
 611             reverse_bgr8(3, This->image_data + stride * first_scanline,
 612                 This->cinfo.output_width, This->cinfo.output_scanline - first_scanline,
 613                 stride);
 614         }
 615
 616         if (This->cinfo.out_color_space == JCS_CMYK && This->cinfo.saw_Adobe_marker)
 617             /* Adobe JPEG's have inverted CMYK data. */
 618             for (i=0; i<data_size; i++)
 619                 This->image_data[i] ^= 0xff;
 620     }
 621
 622     LeaveCriticalSection(&This->lock);
 623
 624     return copy_pixels(bpp, This->image_data,
 625         This->cinfo.output_width, This->cinfo.output_height, stride,
 626         prc, cbStride, cbBufferSize, pbBuffer);
 627 }
 628
 629 static HRESULT WINAPI JpegDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 630     IWICMetadataQueryReader **ppIMetadataQueryReader)
 631 {
 632     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 633     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 634 }
 635
 636 static HRESULT WINAPI JpegDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *iface,
 637     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 638 {
 639     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
 640     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 641 }
 642
 643 static HRESULT WINAPI JpegDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
 644     IWICBitmapSource **ppIThumbnail)
 645 {
 646     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 647     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 648 }
 649
 650 static const IWICBitmapFrameDecodeVtbl JpegDecoder_Frame_Vtbl = {
 651     JpegDecoder_Frame_QueryInterface,
 652     JpegDecoder_Frame_AddRef,
 653     JpegDecoder_Frame_Release,
 654     JpegDecoder_Frame_GetSize,
 655     JpegDecoder_Frame_GetPixelFormat,
 656     JpegDecoder_Frame_GetResolution,
 657     JpegDecoder_Frame_CopyPalette,
 658     JpegDecoder_Frame_CopyPixels,
 659     JpegDecoder_Frame_GetMetadataQueryReader,
 660     JpegDecoder_Frame_GetColorContexts,
 661     JpegDecoder_Frame_GetThumbnail
 662 };
 663
 664 HRESULT JpegDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 665 {
 666     JpegDecoder *This;
 667     HRESULT ret;
 668
 669     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 670
 671     if (!libjpeg_handle && !load_libjpeg())
 672     {
 673         ERR("Failed reading JPEG because unable to find %s\n", SONAME_LIBJPEG);
 674         return E_FAIL;
 675     }
 676
 677     *ppv = NULL;
 678
 679     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 680
 681     This = HeapAlloc(GetProcessHeap(), 0, sizeof(JpegDecoder));
 682     if (!This) return E_OUTOFMEMORY;
 683
 684     This->IWICBitmapDecoder_iface.lpVtbl = &JpegDecoder_Vtbl;
 685     This->IWICBitmapFrameDecode_iface.lpVtbl = &JpegDecoder_Frame_Vtbl;
 686     This->ref = 1;
 687     This->initialized = FALSE;
 688     This->cinfo_initialized = FALSE;
 689     This->stream = NULL;
 690     This->image_data = NULL;
 691     InitializeCriticalSection(&This->lock);
 692     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": JpegDecoder.lock");
 693
 694     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
 695     IUnknown_Release((IUnknown*)This);
 696
 697     return ret;
 698 }
 699
 700 #else /* !defined(SONAME_LIBJPEG) */
 701
 702 HRESULT JpegDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 703 {
 704     ERR("Trying to load JPEG picture, but JPEG support is not compiled in.\n");
 705     return E_FAIL;
 706 }
 707
 708 #endif