git.oblomov.eu Git - wine/blob - dlls/windowscodecs/converter.c

   1 /*
   2  * Copyright 2009 Vincent Povirk
   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 "wincodecs_private.h"
  31
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  35
  36 struct FormatConverter;
  37
  38 enum pixelformat {
  39     format_1bppIndexed,
  40     format_2bppIndexed,
  41     format_4bppIndexed,
  42     format_8bppIndexed,
  43     format_BlackWhite,
  44     format_2bppGray,
  45     format_4bppGray,
  46     format_8bppGray,
  47     format_16bppGray,
  48     format_16bppBGR555,
  49     format_16bppBGR565,
  50     format_16bppBGRA5551,
  51     format_24bppBGR,
  52     format_32bppBGR,
  53     format_32bppBGRA,
  54     format_32bppPBGRA,
  55     format_48bppRGB,
  56     format_64bppRGBA,
  57     format_32bppCMYK,
  58 };
  59
  60 typedef HRESULT (*copyfunc)(struct FormatConverter *This, const WICRect *prc,
  61     UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer, enum pixelformat source_format);
  62
  63 struct pixelformatinfo {
  64     enum pixelformat format;
  65     const WICPixelFormatGUID *guid;
  66     copyfunc copy_function;
  67 };
  68
  69 typedef struct FormatConverter {
  70     IWICFormatConverter IWICFormatConverter_iface;
  71     LONG ref;
  72     IWICBitmapSource *source;
  73     const struct pixelformatinfo *dst_format, *src_format;
  74     WICBitmapDitherType dither;
  75     double alpha_threshold;
  76     WICBitmapPaletteType palette_type;
  77     CRITICAL_SECTION lock; /* must be held when initialized */
  78 } FormatConverter;
  79
  80 static inline FormatConverter *impl_from_IWICFormatConverter(IWICFormatConverter *iface)
  81 {
  82     return CONTAINING_RECORD(iface, FormatConverter, IWICFormatConverter_iface);
  83 }
  84
  85 static void make_grayscale_palette(WICColor *colors, UINT num_colors)
  86 {
  87     int i, v;
  88     for (i=0; i<num_colors; i++)
  89     {
  90         v = i * 255 / (num_colors-1);
  91         colors[i] = 0xff000000 | v<<16 | v<<8 | v;
  92     }
  93 }
  94
  95 static HRESULT copypixels_to_32bppBGRA(struct FormatConverter *This, const WICRect *prc,
  96     UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer, enum pixelformat source_format)
  97 {
  98     switch (source_format)
  99     {
 100     case format_1bppIndexed:
 101     case format_BlackWhite:
 102         if (prc)
 103         {
 104             HRESULT res;
 105             UINT x, y;
 106             BYTE *srcdata;
 107             UINT srcstride, srcdatasize;
 108             const BYTE *srcrow;
 109             const BYTE *srcbyte;
 110             BYTE *dstrow;
 111             DWORD *dstpixel;
 112             WICColor colors[2];
 113             IWICPalette *palette;
 114             UINT actualcolors;
 115
 116             if (source_format == format_1bppIndexed)
 117             {
 118                 res = PaletteImpl_Create(&palette);
 119                 if (FAILED(res)) return res;
 120
 121                 res = IWICBitmapSource_CopyPalette(This->source, palette);
 122                 if (SUCCEEDED(res))
 123                     res = IWICPalette_GetColors(palette, 2, colors, &actualcolors);
 124
 125                 IWICPalette_Release(palette);
 126
 127                 if (FAILED(res)) return res;
 128             }
 129             else
 130             {
 131                 colors[0] = 0xff000000;
 132                 colors[1] = 0xffffffff;
 133             }
 134
 135             srcstride = (prc->Width+7)/8;
 136             srcdatasize = srcstride * prc->Height;
 137
 138             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 139             if (!srcdata) return E_OUTOFMEMORY;
 140
 141             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 142
 143             if (SUCCEEDED(res))
 144             {
 145                 srcrow = srcdata;
 146                 dstrow = pbBuffer;
 147                 for (y=0; y<prc->Height; y++) {
 148                     srcbyte = srcrow;
 149                     dstpixel=(DWORD*)dstrow;
 150                     for (x=0; x<prc->Width; x+=8) {
 151                         BYTE srcval;
 152                         srcval=*srcbyte++;
 153                         *dstpixel++ = colors[srcval>>7&1];
 154                         if (x+1 < prc->Width) *dstpixel++ = colors[srcval>>6&1];
 155                         if (x+2 < prc->Width) *dstpixel++ = colors[srcval>>5&1];
 156                         if (x+3 < prc->Width) *dstpixel++ = colors[srcval>>4&1];
 157                         if (x+4 < prc->Width) *dstpixel++ = colors[srcval>>3&1];
 158                         if (x+5 < prc->Width) *dstpixel++ = colors[srcval>>2&1];
 159                         if (x+6 < prc->Width) *dstpixel++ = colors[srcval>>1&1];
 160                         if (x+7 < prc->Width) *dstpixel++ = colors[srcval&1];
 161                     }
 162                     srcrow += srcstride;
 163                     dstrow += cbStride;
 164                 }
 165             }
 166
 167             HeapFree(GetProcessHeap(), 0, srcdata);
 168
 169             return res;
 170         }
 171         return S_OK;
 172     case format_2bppIndexed:
 173     case format_2bppGray:
 174         if (prc)
 175         {
 176             HRESULT res;
 177             UINT x, y;
 178             BYTE *srcdata;
 179             UINT srcstride, srcdatasize;
 180             const BYTE *srcrow;
 181             const BYTE *srcbyte;
 182             BYTE *dstrow;
 183             DWORD *dstpixel;
 184             WICColor colors[4];
 185             IWICPalette *palette;
 186             UINT actualcolors;
 187
 188             if (source_format == format_2bppIndexed)
 189             {
 190                 res = PaletteImpl_Create(&palette);
 191                 if (FAILED(res)) return res;
 192
 193                 res = IWICBitmapSource_CopyPalette(This->source, palette);
 194                 if (SUCCEEDED(res))
 195                     res = IWICPalette_GetColors(palette, 4, colors, &actualcolors);
 196
 197                 IWICPalette_Release(palette);
 198
 199                 if (FAILED(res)) return res;
 200             }
 201             else
 202                 make_grayscale_palette(colors, 4);
 203
 204             srcstride = (prc->Width+3)/4;
 205             srcdatasize = srcstride * prc->Height;
 206
 207             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 208             if (!srcdata) return E_OUTOFMEMORY;
 209
 210             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 211
 212             if (SUCCEEDED(res))
 213             {
 214                 srcrow = srcdata;
 215                 dstrow = pbBuffer;
 216                 for (y=0; y<prc->Height; y++) {
 217                     srcbyte = srcrow;
 218                     dstpixel=(DWORD*)dstrow;
 219                     for (x=0; x<prc->Width; x+=4) {
 220                         BYTE srcval;
 221                         srcval=*srcbyte++;
 222                         *dstpixel++ = colors[srcval>>6];
 223                         if (x+1 < prc->Width) *dstpixel++ = colors[srcval>>4&0x3];
 224                         if (x+2 < prc->Width) *dstpixel++ = colors[srcval>>2&0x3];
 225                         if (x+1 < prc->Width) *dstpixel++ = colors[srcval&0x3];
 226                     }
 227                     srcrow += srcstride;
 228                     dstrow += cbStride;
 229                 }
 230             }
 231
 232             HeapFree(GetProcessHeap(), 0, srcdata);
 233
 234             return res;
 235         }
 236         return S_OK;
 237     case format_4bppIndexed:
 238     case format_4bppGray:
 239         if (prc)
 240         {
 241             HRESULT res;
 242             UINT x, y;
 243             BYTE *srcdata;
 244             UINT srcstride, srcdatasize;
 245             const BYTE *srcrow;
 246             const BYTE *srcbyte;
 247             BYTE *dstrow;
 248             DWORD *dstpixel;
 249             WICColor colors[16];
 250             IWICPalette *palette;
 251             UINT actualcolors;
 252
 253             if (source_format == format_4bppIndexed)
 254             {
 255                 res = PaletteImpl_Create(&palette);
 256                 if (FAILED(res)) return res;
 257
 258                 res = IWICBitmapSource_CopyPalette(This->source, palette);
 259                 if (SUCCEEDED(res))
 260                     res = IWICPalette_GetColors(palette, 16, colors, &actualcolors);
 261
 262                 IWICPalette_Release(palette);
 263
 264                 if (FAILED(res)) return res;
 265             }
 266             else
 267                 make_grayscale_palette(colors, 16);
 268
 269             srcstride = (prc->Width+1)/2;
 270             srcdatasize = srcstride * prc->Height;
 271
 272             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 273             if (!srcdata) return E_OUTOFMEMORY;
 274
 275             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 276
 277             if (SUCCEEDED(res))
 278             {
 279                 srcrow = srcdata;
 280                 dstrow = pbBuffer;
 281                 for (y=0; y<prc->Height; y++) {
 282                     srcbyte = srcrow;
 283                     dstpixel=(DWORD*)dstrow;
 284                     for (x=0; x<prc->Width; x+=2) {
 285                         BYTE srcval;
 286                         srcval=*srcbyte++;
 287                         *dstpixel++ = colors[srcval>>4];
 288                         if (x+1 < prc->Width) *dstpixel++ = colors[srcval&0xf];
 289                     }
 290                     srcrow += srcstride;
 291                     dstrow += cbStride;
 292                 }
 293             }
 294
 295             HeapFree(GetProcessHeap(), 0, srcdata);
 296
 297             return res;
 298         }
 299         return S_OK;
 300     case format_8bppGray:
 301         if (prc)
 302         {
 303             HRESULT res;
 304             UINT x, y;
 305             BYTE *srcdata;
 306             UINT srcstride, srcdatasize;
 307             const BYTE *srcrow;
 308             const BYTE *srcbyte;
 309             BYTE *dstrow;
 310             DWORD *dstpixel;
 311
 312             srcstride = prc->Width;
 313             srcdatasize = srcstride * prc->Height;
 314
 315             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 316             if (!srcdata) return E_OUTOFMEMORY;
 317
 318             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 319
 320             if (SUCCEEDED(res))
 321             {
 322                 srcrow = srcdata;
 323                 dstrow = pbBuffer;
 324                 for (y=0; y<prc->Height; y++) {
 325                     srcbyte = srcrow;
 326                     dstpixel=(DWORD*)dstrow;
 327                     for (x=0; x<prc->Width; x++)
 328                     {
 329                         *dstpixel++ = 0xff000000|(*srcbyte<<16)|(*srcbyte<<8)|*srcbyte;
 330                         srcbyte++;
 331                     }
 332                     srcrow += srcstride;
 333                     dstrow += cbStride;
 334                 }
 335             }
 336
 337             HeapFree(GetProcessHeap(), 0, srcdata);
 338
 339             return res;
 340         }
 341         return S_OK;
 342     case format_8bppIndexed:
 343         if (prc)
 344         {
 345             HRESULT res;
 346             UINT x, y;
 347             BYTE *srcdata;
 348             UINT srcstride, srcdatasize;
 349             const BYTE *srcrow;
 350             const BYTE *srcbyte;
 351             BYTE *dstrow;
 352             DWORD *dstpixel;
 353             WICColor colors[256];
 354             IWICPalette *palette;
 355             UINT actualcolors;
 356
 357             res = PaletteImpl_Create(&palette);
 358             if (FAILED(res)) return res;
 359
 360             res = IWICBitmapSource_CopyPalette(This->source, palette);
 361             if (SUCCEEDED(res))
 362                 res = IWICPalette_GetColors(palette, 256, colors, &actualcolors);
 363
 364             IWICPalette_Release(palette);
 365
 366             if (FAILED(res)) return res;
 367
 368             srcstride = prc->Width;
 369             srcdatasize = srcstride * prc->Height;
 370
 371             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 372             if (!srcdata) return E_OUTOFMEMORY;
 373
 374             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 375
 376             if (SUCCEEDED(res))
 377             {
 378                 srcrow = srcdata;
 379                 dstrow = pbBuffer;
 380                 for (y=0; y<prc->Height; y++) {
 381                     srcbyte = srcrow;
 382                     dstpixel=(DWORD*)dstrow;
 383                     for (x=0; x<prc->Width; x++)
 384                         *dstpixel++ = colors[*srcbyte++];
 385                     srcrow += srcstride;
 386                     dstrow += cbStride;
 387                 }
 388             }
 389
 390             HeapFree(GetProcessHeap(), 0, srcdata);
 391
 392             return res;
 393         }
 394         return S_OK;
 395     case format_16bppGray:
 396         if (prc)
 397         {
 398             HRESULT res;
 399             UINT x, y;
 400             BYTE *srcdata;
 401             UINT srcstride, srcdatasize;
 402             const BYTE *srcrow;
 403             const BYTE *srcbyte;
 404             BYTE *dstrow;
 405             DWORD *dstpixel;
 406
 407             srcstride = prc->Width * 2;
 408             srcdatasize = srcstride * prc->Height;
 409
 410             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 411             if (!srcdata) return E_OUTOFMEMORY;
 412
 413             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 414
 415             if (SUCCEEDED(res))
 416             {
 417                 srcrow = srcdata;
 418                 dstrow = pbBuffer;
 419                 for (y=0; y<prc->Height; y++) {
 420                     srcbyte = srcrow;
 421                     dstpixel=(DWORD*)dstrow;
 422                     for (x=0; x<prc->Width; x++)
 423                     {
 424                         *dstpixel++ = 0xff000000|(*srcbyte<<16)|(*srcbyte<<8)|*srcbyte;
 425                         srcbyte+=2;
 426                     }
 427                     srcrow += srcstride;
 428                     dstrow += cbStride;
 429                 }
 430             }
 431
 432             HeapFree(GetProcessHeap(), 0, srcdata);
 433
 434             return res;
 435         }
 436         return S_OK;
 437     case format_16bppBGR555:
 438         if (prc)
 439         {
 440             HRESULT res;
 441             UINT x, y;
 442             BYTE *srcdata;
 443             UINT srcstride, srcdatasize;
 444             const BYTE *srcrow;
 445             const WORD *srcpixel;
 446             BYTE *dstrow;
 447             DWORD *dstpixel;
 448
 449             srcstride = 2 * prc->Width;
 450             srcdatasize = srcstride * prc->Height;
 451
 452             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 453             if (!srcdata) return E_OUTOFMEMORY;
 454
 455             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 456
 457             if (SUCCEEDED(res))
 458             {
 459                 srcrow = srcdata;
 460                 dstrow = pbBuffer;
 461                 for (y=0; y<prc->Height; y++) {
 462                     srcpixel=(const WORD*)srcrow;
 463                     dstpixel=(DWORD*)dstrow;
 464                     for (x=0; x<prc->Width; x++) {
 465                         WORD srcval;
 466                         srcval=*srcpixel++;
 467                         *dstpixel++=0xff000000 | /* constant 255 alpha */
 468                                     ((srcval << 9) & 0xf80000) | /* r */
 469                                     ((srcval << 4) & 0x070000) | /* r - 3 bits */
 470                                     ((srcval << 6) & 0x00f800) | /* g */
 471                                     ((srcval << 1) & 0x000700) | /* g - 3 bits */
 472                                     ((srcval << 3) & 0x0000f8) | /* b */
 473                                     ((srcval >> 2) & 0x000007);  /* b - 3 bits */
 474                     }
 475                     srcrow += srcstride;
 476                     dstrow += cbStride;
 477                 }
 478             }
 479
 480             HeapFree(GetProcessHeap(), 0, srcdata);
 481
 482             return res;
 483         }
 484         return S_OK;
 485     case format_16bppBGR565:
 486         if (prc)
 487         {
 488             HRESULT res;
 489             UINT x, y;
 490             BYTE *srcdata;
 491             UINT srcstride, srcdatasize;
 492             const BYTE *srcrow;
 493             const WORD *srcpixel;
 494             BYTE *dstrow;
 495             DWORD *dstpixel;
 496
 497             srcstride = 2 * prc->Width;
 498             srcdatasize = srcstride * prc->Height;
 499
 500             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 501             if (!srcdata) return E_OUTOFMEMORY;
 502
 503             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 504
 505             if (SUCCEEDED(res))
 506             {
 507                 srcrow = srcdata;
 508                 dstrow = pbBuffer;
 509                 for (y=0; y<prc->Height; y++) {
 510                     srcpixel=(const WORD*)srcrow;
 511                     dstpixel=(DWORD*)dstrow;
 512                     for (x=0; x<prc->Width; x++) {
 513                         WORD srcval;
 514                         srcval=*srcpixel++;
 515                         *dstpixel++=0xff000000 | /* constant 255 alpha */
 516                                     ((srcval << 8) & 0xf80000) | /* r */
 517                                     ((srcval << 3) & 0x070000) | /* r - 3 bits */
 518                                     ((srcval << 5) & 0x00fc00) | /* g */
 519                                     ((srcval >> 1) & 0x000300) | /* g - 2 bits */
 520                                     ((srcval << 3) & 0x0000f8) | /* b */
 521                                     ((srcval >> 2) & 0x000007);  /* b - 3 bits */
 522                     }
 523                     srcrow += srcstride;
 524                     dstrow += cbStride;
 525                 }
 526             }
 527
 528             HeapFree(GetProcessHeap(), 0, srcdata);
 529
 530             return res;
 531         }
 532         return S_OK;
 533     case format_16bppBGRA5551:
 534         if (prc)
 535         {
 536             HRESULT res;
 537             UINT x, y;
 538             BYTE *srcdata;
 539             UINT srcstride, srcdatasize;
 540             const BYTE *srcrow;
 541             const WORD *srcpixel;
 542             BYTE *dstrow;
 543             DWORD *dstpixel;
 544
 545             srcstride = 2 * prc->Width;
 546             srcdatasize = srcstride * prc->Height;
 547
 548             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 549             if (!srcdata) return E_OUTOFMEMORY;
 550
 551             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 552
 553             if (SUCCEEDED(res))
 554             {
 555                 srcrow = srcdata;
 556                 dstrow = pbBuffer;
 557                 for (y=0; y<prc->Height; y++) {
 558                     srcpixel=(const WORD*)srcrow;
 559                     dstpixel=(DWORD*)dstrow;
 560                     for (x=0; x<prc->Width; x++) {
 561                         WORD srcval;
 562                         srcval=*srcpixel++;
 563                         *dstpixel++=((srcval & 0x8000) ? 0xff000000 : 0) | /* alpha */
 564                                     ((srcval << 9) & 0xf80000) | /* r */
 565                                     ((srcval << 4) & 0x070000) | /* r - 3 bits */
 566                                     ((srcval << 6) & 0x00f800) | /* g */
 567                                     ((srcval << 1) & 0x000700) | /* g - 3 bits */
 568                                     ((srcval << 3) & 0x0000f8) | /* b */
 569                                     ((srcval >> 2) & 0x000007);  /* b - 3 bits */
 570                     }
 571                     srcrow += srcstride;
 572                     dstrow += cbStride;
 573                 }
 574             }
 575
 576             HeapFree(GetProcessHeap(), 0, srcdata);
 577
 578             return res;
 579         }
 580         return S_OK;
 581     case format_24bppBGR:
 582         if (prc)
 583         {
 584             HRESULT res;
 585             UINT x, y;
 586             BYTE *srcdata;
 587             UINT srcstride, srcdatasize;
 588             const BYTE *srcrow;
 589             const BYTE *srcpixel;
 590             BYTE *dstrow;
 591             BYTE *dstpixel;
 592
 593             srcstride = 3 * prc->Width;
 594             srcdatasize = srcstride * prc->Height;
 595
 596             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 597             if (!srcdata) return E_OUTOFMEMORY;
 598
 599             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 600
 601             if (SUCCEEDED(res))
 602             {
 603                 srcrow = srcdata;
 604                 dstrow = pbBuffer;
 605                 for (y=0; y<prc->Height; y++) {
 606                     srcpixel=srcrow;
 607                     dstpixel=dstrow;
 608                     for (x=0; x<prc->Width; x++) {
 609                         *dstpixel++=*srcpixel++; /* blue */
 610                         *dstpixel++=*srcpixel++; /* green */
 611                         *dstpixel++=*srcpixel++; /* red */
 612                         *dstpixel++=255; /* alpha */
 613                     }
 614                     srcrow += srcstride;
 615                     dstrow += cbStride;
 616                 }
 617             }
 618
 619             HeapFree(GetProcessHeap(), 0, srcdata);
 620
 621             return res;
 622         }
 623         return S_OK;
 624     case format_32bppBGR:
 625         if (prc)
 626         {
 627             HRESULT res;
 628             UINT x, y;
 629
 630             res = IWICBitmapSource_CopyPixels(This->source, prc, cbStride, cbBufferSize, pbBuffer);
 631             if (FAILED(res)) return res;
 632
 633             /* set all alpha values to 255 */
 634             for (y=0; y<prc->Height; y++)
 635                 for (x=0; x<prc->Width; x++)
 636                     pbBuffer[cbStride*y+4*x+3] = 0xff;
 637         }
 638         return S_OK;
 639     case format_32bppBGRA:
 640         if (prc)
 641             return IWICBitmapSource_CopyPixels(This->source, prc, cbStride, cbBufferSize, pbBuffer);
 642         return S_OK;
 643     case format_32bppPBGRA:
 644         if (prc)
 645         {
 646             HRESULT res;
 647             UINT x, y;
 648
 649             res = IWICBitmapSource_CopyPixels(This->source, prc, cbStride, cbBufferSize, pbBuffer);
 650             if (FAILED(res)) return res;
 651
 652             for (y=0; y<prc->Height; y++)
 653                 for (x=0; x<prc->Width; x++)
 654                 {
 655                     BYTE alpha = pbBuffer[cbStride*y+4*x+3];
 656                     if (alpha != 0 && alpha != 255)
 657                     {
 658                         pbBuffer[cbStride*y+4*x] = pbBuffer[cbStride*y+4*x] * 255 / alpha;
 659                         pbBuffer[cbStride*y+4*x+1] = pbBuffer[cbStride*y+4*x+1] * 255 / alpha;
 660                         pbBuffer[cbStride*y+4*x+2] = pbBuffer[cbStride*y+4*x+2] * 255 / alpha;
 661                     }
 662                 }
 663         }
 664         return S_OK;
 665     case format_48bppRGB:
 666         if (prc)
 667         {
 668             HRESULT res;
 669             UINT x, y;
 670             BYTE *srcdata;
 671             UINT srcstride, srcdatasize;
 672             const BYTE *srcrow;
 673             const BYTE *srcpixel;
 674             BYTE *dstrow;
 675             DWORD *dstpixel;
 676
 677             srcstride = 6 * prc->Width;
 678             srcdatasize = srcstride * prc->Height;
 679
 680             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 681             if (!srcdata) return E_OUTOFMEMORY;
 682
 683             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 684
 685             if (SUCCEEDED(res))
 686             {
 687                 srcrow = srcdata;
 688                 dstrow = pbBuffer;
 689                 for (y=0; y<prc->Height; y++) {
 690                     srcpixel=srcrow;
 691                     dstpixel=(DWORD*)dstrow;
 692                     for (x=0; x<prc->Width; x++) {
 693                         BYTE red, green, blue;
 694                         red = *srcpixel++; srcpixel++;
 695                         green = *srcpixel++; srcpixel++;
 696                         blue = *srcpixel++; srcpixel++;
 697                         *dstpixel++=0xff000000|red<<16|green<<8|blue;
 698                     }
 699                     srcrow += srcstride;
 700                     dstrow += cbStride;
 701                 }
 702             }
 703
 704             HeapFree(GetProcessHeap(), 0, srcdata);
 705
 706             return res;
 707         }
 708         return S_OK;
 709     case format_64bppRGBA:
 710         if (prc)
 711         {
 712             HRESULT res;
 713             UINT x, y;
 714             BYTE *srcdata;
 715             UINT srcstride, srcdatasize;
 716             const BYTE *srcrow;
 717             const BYTE *srcpixel;
 718             BYTE *dstrow;
 719             DWORD *dstpixel;
 720
 721             srcstride = 8 * prc->Width;
 722             srcdatasize = srcstride * prc->Height;
 723
 724             srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
 725             if (!srcdata) return E_OUTOFMEMORY;
 726
 727             res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
 728
 729             if (SUCCEEDED(res))
 730             {
 731                 srcrow = srcdata;
 732                 dstrow = pbBuffer;
 733                 for (y=0; y<prc->Height; y++) {
 734                     srcpixel=srcrow;
 735                     dstpixel=(DWORD*)dstrow;
 736                     for (x=0; x<prc->Width; x++) {
 737                         BYTE red, green, blue, alpha;
 738                         red = *srcpixel++; srcpixel++;
 739                         green = *srcpixel++; srcpixel++;
 740                         blue = *srcpixel++; srcpixel++;
 741                         alpha = *srcpixel++; srcpixel++;
 742                         *dstpixel++=alpha<<24|red<<16|green<<8|blue;
 743                     }
 744                     srcrow += srcstride;
 745                     dstrow += cbStride;
 746                 }
 747             }
 748
 749             HeapFree(GetProcessHeap(), 0, srcdata);
 750
 751             return res;
 752         }
 753         return S_OK;
 754     case format_32bppCMYK:
 755         if (prc)
 756         {
 757             HRESULT res;
 758             UINT x, y;
 759
 760             res = IWICBitmapSource_CopyPixels(This->source, prc, cbStride, cbBufferSize, pbBuffer);
 761             if (FAILED(res)) return res;
 762
 763             for (y=0; y<prc->Height; y++)
 764                 for (x=0; x<prc->Width; x++)
 765                 {
 766                     BYTE *pixel = pbBuffer+cbStride*y+4*x;
 767                     BYTE c=pixel[0], m=pixel[1], y=pixel[2], k=pixel[3];
 768                     pixel[0] = (255-y)*(255-k)/255; /* blue */
 769                     pixel[1] = (255-m)*(255-k)/255; /* green */
 770                     pixel[2] = (255-c)*(255-k)/255; /* red */
 771                     pixel[3] = 255; /* alpha */
 772                 }
 773         }
 774         return S_OK;
 775     default:
 776         return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 777     }
 778 }
 779
 780 static HRESULT copypixels_to_32bppBGR(struct FormatConverter *This, const WICRect *prc,
 781     UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer, enum pixelformat source_format)
 782 {
 783     switch (source_format)
 784     {
 785     case format_32bppBGR:
 786     case format_32bppBGRA:
 787     case format_32bppPBGRA:
 788         if (prc)
 789             return IWICBitmapSource_CopyPixels(This->source, prc, cbStride, cbBufferSize, pbBuffer);
 790         return S_OK;
 791     default:
 792         return copypixels_to_32bppBGRA(This, prc, cbStride, cbBufferSize, pbBuffer, source_format);
 793     }
 794 }
 795
 796 static HRESULT copypixels_to_32bppPBGRA(struct FormatConverter *This, const WICRect *prc,
 797     UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer, enum pixelformat source_format)
 798 {
 799     HRESULT hr;
 800
 801     switch (source_format)
 802     {
 803     case format_32bppPBGRA:
 804         if (prc)
 805             return IWICBitmapSource_CopyPixels(This->source, prc, cbStride, cbBufferSize, pbBuffer);
 806         return S_OK;
 807     default:
 808         hr = copypixels_to_32bppBGRA(This, prc, cbStride, cbBufferSize, pbBuffer, source_format);
 809         if (SUCCEEDED(hr) && prc)
 810         {
 811             UINT x, y;
 812
 813             for (y=0; y<prc->Height; y++)
 814                 for (x=0; x<prc->Width; x++)
 815                 {
 816                     BYTE alpha = pbBuffer[cbStride*y+4*x+3];
 817                     if (alpha != 255)
 818                     {
 819                         pbBuffer[cbStride*y+4*x] = pbBuffer[cbStride*y+4*x] * alpha / 255;
 820                         pbBuffer[cbStride*y+4*x+1] = pbBuffer[cbStride*y+4*x+1] * alpha / 255;
 821                         pbBuffer[cbStride*y+4*x+2] = pbBuffer[cbStride*y+4*x+2] * alpha / 255;
 822                     }
 823                 }
 824         }
 825         return hr;
 826     }
 827 }
 828
 829 static const struct pixelformatinfo supported_formats[] = {
 830     {format_1bppIndexed, &GUID_WICPixelFormat1bppIndexed, NULL},
 831     {format_2bppIndexed, &GUID_WICPixelFormat2bppIndexed, NULL},
 832     {format_4bppIndexed, &GUID_WICPixelFormat4bppIndexed, NULL},
 833     {format_8bppIndexed, &GUID_WICPixelFormat8bppIndexed, NULL},
 834     {format_BlackWhite, &GUID_WICPixelFormatBlackWhite, NULL},
 835     {format_2bppGray, &GUID_WICPixelFormat2bppGray, NULL},
 836     {format_4bppGray, &GUID_WICPixelFormat4bppGray, NULL},
 837     {format_8bppGray, &GUID_WICPixelFormat8bppGray, NULL},
 838     {format_16bppGray, &GUID_WICPixelFormat16bppGray, NULL},
 839     {format_16bppBGR555, &GUID_WICPixelFormat16bppBGR555, NULL},
 840     {format_16bppBGR565, &GUID_WICPixelFormat16bppBGR565, NULL},
 841     {format_16bppBGRA5551, &GUID_WICPixelFormat16bppBGRA5551, NULL},
 842     {format_24bppBGR, &GUID_WICPixelFormat24bppBGR, NULL},
 843     {format_32bppBGR, &GUID_WICPixelFormat32bppBGR, copypixels_to_32bppBGR},
 844     {format_32bppBGRA, &GUID_WICPixelFormat32bppBGRA, copypixels_to_32bppBGRA},
 845     {format_32bppPBGRA, &GUID_WICPixelFormat32bppPBGRA, copypixels_to_32bppPBGRA},
 846     {format_48bppRGB, &GUID_WICPixelFormat48bppRGB, NULL},
 847     {format_64bppRGBA, &GUID_WICPixelFormat64bppRGBA, NULL},
 848     {format_32bppCMYK, &GUID_WICPixelFormat32bppCMYK, NULL},
 849     {0}
 850 };
 851
 852 static const struct pixelformatinfo *get_formatinfo(const WICPixelFormatGUID *format)
 853 {
 854     UINT i;
 855
 856     for (i=0; supported_formats[i].guid; i++)
 857         if (IsEqualGUID(supported_formats[i].guid, format)) return &supported_formats[i];
 858
 859     return NULL;
 860 }
 861
 862 static HRESULT WINAPI FormatConverter_QueryInterface(IWICFormatConverter *iface, REFIID iid,
 863     void **ppv)
 864 {
 865     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 866     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 867
 868     if (!ppv) return E_INVALIDARG;
 869
 870     if (IsEqualIID(&IID_IUnknown, iid) ||
 871         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 872         IsEqualIID(&IID_IWICFormatConverter, iid))
 873     {
 874         *ppv = This;
 875     }
 876     else
 877     {
 878         *ppv = NULL;
 879         return E_NOINTERFACE;
 880     }
 881
 882     IUnknown_AddRef((IUnknown*)*ppv);
 883     return S_OK;
 884 }
 885
 886 static ULONG WINAPI FormatConverter_AddRef(IWICFormatConverter *iface)
 887 {
 888     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 889     ULONG ref = InterlockedIncrement(&This->ref);
 890
 891     TRACE("(%p) refcount=%u\n", iface, ref);
 892
 893     return ref;
 894 }
 895
 896 static ULONG WINAPI FormatConverter_Release(IWICFormatConverter *iface)
 897 {
 898     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 899     ULONG ref = InterlockedDecrement(&This->ref);
 900
 901     TRACE("(%p) refcount=%u\n", iface, ref);
 902
 903     if (ref == 0)
 904     {
 905         This->lock.DebugInfo->Spare[0] = 0;
 906         DeleteCriticalSection(&This->lock);
 907         if (This->source) IWICBitmapSource_Release(This->source);
 908         HeapFree(GetProcessHeap(), 0, This);
 909     }
 910
 911     return ref;
 912 }
 913
 914 static HRESULT WINAPI FormatConverter_GetSize(IWICFormatConverter *iface,
 915     UINT *puiWidth, UINT *puiHeight)
 916 {
 917     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 918
 919     TRACE("(%p,%p,%p)\n", iface, puiWidth, puiHeight);
 920
 921     if (This->source)
 922         return IWICBitmapSource_GetSize(This->source, puiWidth, puiHeight);
 923     else
 924         return WINCODEC_ERR_NOTINITIALIZED;
 925 }
 926
 927 static HRESULT WINAPI FormatConverter_GetPixelFormat(IWICFormatConverter *iface,
 928     WICPixelFormatGUID *pPixelFormat)
 929 {
 930     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 931
 932     TRACE("(%p,%p): stub\n", iface, pPixelFormat);
 933
 934     if (This->source)
 935         memcpy(pPixelFormat, This->dst_format->guid, sizeof(GUID));
 936     else
 937         return WINCODEC_ERR_NOTINITIALIZED;
 938
 939     return S_OK;
 940 }
 941
 942 static HRESULT WINAPI FormatConverter_GetResolution(IWICFormatConverter *iface,
 943     double *pDpiX, double *pDpiY)
 944 {
 945     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 946
 947     TRACE("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
 948
 949     if (This->source)
 950         return IWICBitmapSource_GetResolution(This->source, pDpiX, pDpiY);
 951     else
 952         return WINCODEC_ERR_NOTINITIALIZED;
 953 }
 954
 955 static HRESULT WINAPI FormatConverter_CopyPalette(IWICFormatConverter *iface,
 956     IWICPalette *pIPalette)
 957 {
 958     FIXME("(%p,%p): stub\n", iface, pIPalette);
 959     return E_NOTIMPL;
 960 }
 961
 962 static HRESULT WINAPI FormatConverter_CopyPixels(IWICFormatConverter *iface,
 963     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 964 {
 965     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 966     WICRect rc;
 967     HRESULT hr;
 968     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 969
 970     if (This->source)
 971     {
 972         if (!prc)
 973         {
 974             UINT width, height;
 975             hr = IWICBitmapSource_GetSize(This->source, &width, &height);
 976             if (FAILED(hr)) return hr;
 977             rc.X = 0;
 978             rc.Y = 0;
 979             rc.Width = width;
 980             rc.Height = height;
 981             prc = &rc;
 982         }
 983
 984         return This->dst_format->copy_function(This, prc, cbStride, cbBufferSize,
 985             pbBuffer, This->src_format->format);
 986     }
 987     else
 988         return WINCODEC_ERR_NOTINITIALIZED;
 989 }
 990
 991 static HRESULT WINAPI FormatConverter_Initialize(IWICFormatConverter *iface,
 992     IWICBitmapSource *pISource, REFWICPixelFormatGUID dstFormat, WICBitmapDitherType dither,
 993     IWICPalette *pIPalette, double alphaThresholdPercent, WICBitmapPaletteType paletteTranslate)
 994 {
 995     FormatConverter *This = impl_from_IWICFormatConverter(iface);
 996     const struct pixelformatinfo *srcinfo, *dstinfo;
 997     static INT fixme=0;
 998     GUID srcFormat;
 999     HRESULT res=S_OK;
1000
1001     TRACE("(%p,%p,%s,%u,%p,%0.1f,%u)\n", iface, pISource, debugstr_guid(dstFormat),
1002         dither, pIPalette, alphaThresholdPercent, paletteTranslate);
1003
1004     if (pIPalette && !fixme++) FIXME("ignoring palette\n");
1005
1006     EnterCriticalSection(&This->lock);
1007
1008     if (This->source)
1009     {
1010         res = WINCODEC_ERR_WRONGSTATE;
1011         goto end;
1012     }
1013
1014     res = IWICBitmapSource_GetPixelFormat(pISource, &srcFormat);
1015     if (FAILED(res)) goto end;
1016
1017     srcinfo = get_formatinfo(&srcFormat);
1018     if (!srcinfo)
1019     {
1020         res = WINCODEC_ERR_UNSUPPORTEDPIXELFORMAT;
1021         FIXME("Unsupported source format %s\n", debugstr_guid(&srcFormat));
1022         goto end;
1023     }
1024
1025     dstinfo = get_formatinfo(dstFormat);
1026     if (!dstinfo)
1027     {
1028         res = WINCODEC_ERR_UNSUPPORTEDPIXELFORMAT;
1029         FIXME("Unsupported destination format %s\n", debugstr_guid(dstFormat));
1030         goto end;
1031     }
1032
1033     if (dstinfo->copy_function)
1034     {
1035         IWICBitmapSource_AddRef(pISource);
1036         This->src_format = srcinfo;
1037         This->dst_format = dstinfo;
1038         This->dither = dither;
1039         This->alpha_threshold = alphaThresholdPercent;
1040         This->palette_type = paletteTranslate;
1041         This->source = pISource;
1042     }
1043     else
1044     {
1045         FIXME("Unsupported conversion %s -> %s\n", debugstr_guid(&srcFormat), debugstr_guid(dstFormat));
1046         res = WINCODEC_ERR_UNSUPPORTEDOPERATION;
1047     }
1048
1049 end:
1050
1051     LeaveCriticalSection(&This->lock);
1052
1053     return res;
1054 }
1055
1056 static HRESULT WINAPI FormatConverter_CanConvert(IWICFormatConverter *iface,
1057     REFWICPixelFormatGUID srcPixelFormat, REFWICPixelFormatGUID dstPixelFormat,
1058     BOOL *pfCanConvert)
1059 {
1060     FormatConverter *This = impl_from_IWICFormatConverter(iface);
1061     const struct pixelformatinfo *srcinfo, *dstinfo;
1062
1063     TRACE("(%p,%s,%s,%p)\n", iface, debugstr_guid(srcPixelFormat),
1064         debugstr_guid(dstPixelFormat), pfCanConvert);
1065
1066     srcinfo = get_formatinfo(srcPixelFormat);
1067     if (!srcinfo)
1068     {
1069         FIXME("Unsupported source format %s\n", debugstr_guid(srcPixelFormat));
1070         return WINCODEC_ERR_UNSUPPORTEDPIXELFORMAT;
1071     }
1072
1073     dstinfo = get_formatinfo(dstPixelFormat);
1074     if (!dstinfo)
1075     {
1076         FIXME("Unsupported destination format %s\n", debugstr_guid(dstPixelFormat));
1077         return WINCODEC_ERR_UNSUPPORTEDPIXELFORMAT;
1078     }
1079
1080     if (dstinfo->copy_function &&
1081         SUCCEEDED(dstinfo->copy_function(This, NULL, 0, 0, NULL, dstinfo->format)))
1082         *pfCanConvert = TRUE;
1083     else
1084     {
1085         FIXME("Unsupported conversion %s -> %s\n", debugstr_guid(srcPixelFormat), debugstr_guid(dstPixelFormat));
1086         *pfCanConvert = FALSE;
1087     }
1088
1089     return S_OK;
1090 }
1091
1092 static const IWICFormatConverterVtbl FormatConverter_Vtbl = {
1093     FormatConverter_QueryInterface,
1094     FormatConverter_AddRef,
1095     FormatConverter_Release,
1096     FormatConverter_GetSize,
1097     FormatConverter_GetPixelFormat,
1098     FormatConverter_GetResolution,
1099     FormatConverter_CopyPalette,
1100     FormatConverter_CopyPixels,
1101     FormatConverter_Initialize,
1102     FormatConverter_CanConvert
1103 };
1104
1105 HRESULT FormatConverter_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1106 {
1107     FormatConverter *This;
1108     HRESULT ret;
1109
1110     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1111
1112     *ppv = NULL;
1113
1114     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1115
1116     This = HeapAlloc(GetProcessHeap(), 0, sizeof(FormatConverter));
1117     if (!This) return E_OUTOFMEMORY;
1118
1119     This->IWICFormatConverter_iface.lpVtbl = &FormatConverter_Vtbl;
1120     This->ref = 1;
1121     This->source = NULL;
1122     InitializeCriticalSection(&This->lock);
1123     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": FormatConverter.lock");
1124
1125     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
1126     IUnknown_Release((IUnknown*)This);
1127
1128     return ret;
1129 }