dlls/windowscodecs/pngformat.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 #include <stdarg.h>
  23
  24 #ifdef HAVE_PNG_H
  25 #include <png.h>
  26 #endif
  27
  28 #define COBJMACROS
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "objbase.h"
  33 #include "wincodec.h"
  34
  35 #include "wincodecs_private.h"
  36
  37 #include "wine/debug.h"
  38 #include "wine/library.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  41
  42 #ifdef SONAME_LIBPNG
  43
  44 static void *libpng_handle;
  45 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
  46 MAKE_FUNCPTR(png_create_read_struct);
  47 MAKE_FUNCPTR(png_create_info_struct);
  48 MAKE_FUNCPTR(png_create_write_struct);
  49 MAKE_FUNCPTR(png_destroy_read_struct);
  50 MAKE_FUNCPTR(png_destroy_write_struct);
  51 MAKE_FUNCPTR(png_error);
  52 MAKE_FUNCPTR(png_get_bit_depth);
  53 MAKE_FUNCPTR(png_get_color_type);
  54 MAKE_FUNCPTR(png_get_error_ptr);
  55 MAKE_FUNCPTR(png_get_image_height);
  56 MAKE_FUNCPTR(png_get_image_width);
  57 MAKE_FUNCPTR(png_get_io_ptr);
  58 MAKE_FUNCPTR(png_get_pHYs);
  59 MAKE_FUNCPTR(png_get_PLTE);
  60 MAKE_FUNCPTR(png_get_tRNS);
  61 MAKE_FUNCPTR(png_set_bgr);
  62 MAKE_FUNCPTR(png_set_error_fn);
  63 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
  64 MAKE_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
  65 #else
  66 MAKE_FUNCPTR(png_set_gray_1_2_4_to_8);
  67 #endif
  68 MAKE_FUNCPTR(png_set_filler);
  69 MAKE_FUNCPTR(png_set_gray_to_rgb);
  70 MAKE_FUNCPTR(png_set_IHDR);
  71 MAKE_FUNCPTR(png_set_pHYs);
  72 MAKE_FUNCPTR(png_set_read_fn);
  73 MAKE_FUNCPTR(png_set_strip_16);
  74 MAKE_FUNCPTR(png_set_tRNS_to_alpha);
  75 MAKE_FUNCPTR(png_set_write_fn);
  76 MAKE_FUNCPTR(png_read_end);
  77 MAKE_FUNCPTR(png_read_image);
  78 MAKE_FUNCPTR(png_read_info);
  79 MAKE_FUNCPTR(png_write_end);
  80 MAKE_FUNCPTR(png_write_info);
  81 MAKE_FUNCPTR(png_write_rows);
  82 #undef MAKE_FUNCPTR
  83
  84 static void *load_libpng(void)
  85 {
  86     if((libpng_handle = wine_dlopen(SONAME_LIBPNG, RTLD_NOW, NULL, 0)) != NULL) {
  87
  88 #define LOAD_FUNCPTR(f) \
  89     if((p##f = wine_dlsym(libpng_handle, #f, NULL, 0)) == NULL) { \
  90         libpng_handle = NULL; \
  91         return NULL; \
  92     }
  93         LOAD_FUNCPTR(png_create_read_struct);
  94         LOAD_FUNCPTR(png_create_info_struct);
  95         LOAD_FUNCPTR(png_create_write_struct);
  96         LOAD_FUNCPTR(png_destroy_read_struct);
  97         LOAD_FUNCPTR(png_destroy_write_struct);
  98         LOAD_FUNCPTR(png_error);
  99         LOAD_FUNCPTR(png_get_bit_depth);
 100         LOAD_FUNCPTR(png_get_color_type);
 101         LOAD_FUNCPTR(png_get_error_ptr);
 102         LOAD_FUNCPTR(png_get_image_height);
 103         LOAD_FUNCPTR(png_get_image_width);
 104         LOAD_FUNCPTR(png_get_io_ptr);
 105         LOAD_FUNCPTR(png_get_pHYs);
 106         LOAD_FUNCPTR(png_get_PLTE);
 107         LOAD_FUNCPTR(png_get_tRNS);
 108         LOAD_FUNCPTR(png_set_bgr);
 109         LOAD_FUNCPTR(png_set_error_fn);
 110 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 111         LOAD_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 112 #else
 113         LOAD_FUNCPTR(png_set_gray_1_2_4_to_8);
 114 #endif
 115         LOAD_FUNCPTR(png_set_filler);
 116         LOAD_FUNCPTR(png_set_gray_to_rgb);
 117         LOAD_FUNCPTR(png_set_IHDR);
 118         LOAD_FUNCPTR(png_set_pHYs);
 119         LOAD_FUNCPTR(png_set_read_fn);
 120         LOAD_FUNCPTR(png_set_strip_16);
 121         LOAD_FUNCPTR(png_set_tRNS_to_alpha);
 122         LOAD_FUNCPTR(png_set_write_fn);
 123         LOAD_FUNCPTR(png_read_end);
 124         LOAD_FUNCPTR(png_read_image);
 125         LOAD_FUNCPTR(png_read_info);
 126         LOAD_FUNCPTR(png_write_end);
 127         LOAD_FUNCPTR(png_write_info);
 128         LOAD_FUNCPTR(png_write_rows);
 129
 130 #undef LOAD_FUNCPTR
 131     }
 132     return libpng_handle;
 133 }
 134
 135 static void user_error_fn(png_structp png_ptr, png_const_charp error_message)
 136 {
 137     jmp_buf *pjmpbuf;
 138
 139     /* This uses setjmp/longjmp just like the default. We can't use the
 140      * default because there's no way to access the jmp buffer in the png_struct
 141      * that works in 1.2 and 1.4 and allows us to dynamically load libpng. */
 142     WARN("PNG error: %s\n", debugstr_a(error_message));
 143     pjmpbuf = ppng_get_error_ptr(png_ptr);
 144     longjmp(*pjmpbuf, 1);
 145 }
 146
 147 static void user_warning_fn(png_structp png_ptr, png_const_charp warning_message)
 148 {
 149     WARN("PNG warning: %s\n", debugstr_a(warning_message));
 150 }
 151
 152 typedef struct {
 153     IWICBitmapDecoder IWICBitmapDecoder_iface;
 154     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
 155     LONG ref;
 156     png_structp png_ptr;
 157     png_infop info_ptr;
 158     png_infop end_info;
 159     BOOL initialized;
 160     int bpp;
 161     int width, height;
 162     UINT stride;
 163     const WICPixelFormatGUID *format;
 164     BYTE *image_bits;
 165     CRITICAL_SECTION lock; /* must be held when png structures are accessed or initialized is set */
 166 } PngDecoder;
 167
 168 static inline PngDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
 169 {
 170     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapDecoder_iface);
 171 }
 172
 173 static inline PngDecoder *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
 174 {
 175     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapFrameDecode_iface);
 176 }
 177
 178 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl;
 179
 180 static HRESULT WINAPI PngDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 181     void **ppv)
 182 {
 183     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 184     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 185
 186     if (!ppv) return E_INVALIDARG;
 187
 188     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 189     {
 190         *ppv = This;
 191     }
 192     else
 193     {
 194         *ppv = NULL;
 195         return E_NOINTERFACE;
 196     }
 197
 198     IUnknown_AddRef((IUnknown*)*ppv);
 199     return S_OK;
 200 }
 201
 202 static ULONG WINAPI PngDecoder_AddRef(IWICBitmapDecoder *iface)
 203 {
 204     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 205     ULONG ref = InterlockedIncrement(&This->ref);
 206
 207     TRACE("(%p) refcount=%u\n", iface, ref);
 208
 209     return ref;
 210 }
 211
 212 static ULONG WINAPI PngDecoder_Release(IWICBitmapDecoder *iface)
 213 {
 214     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 215     ULONG ref = InterlockedDecrement(&This->ref);
 216
 217     TRACE("(%p) refcount=%u\n", iface, ref);
 218
 219     if (ref == 0)
 220     {
 221         if (This->png_ptr)
 222             ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 223         This->lock.DebugInfo->Spare[0] = 0;
 224         DeleteCriticalSection(&This->lock);
 225         HeapFree(GetProcessHeap(), 0, This->image_bits);
 226         HeapFree(GetProcessHeap(), 0, This);
 227     }
 228
 229     return ref;
 230 }
 231
 232 static HRESULT WINAPI PngDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 233     DWORD *pdwCapability)
 234 {
 235     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
 236     return E_NOTIMPL;
 237 }
 238
 239 static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 240 {
 241     IStream *stream = ppng_get_io_ptr(png_ptr);
 242     HRESULT hr;
 243     ULONG bytesread;
 244
 245     hr = IStream_Read(stream, data, length, &bytesread);
 246     if (FAILED(hr) || bytesread != length)
 247     {
 248         ppng_error(png_ptr, "failed reading data");
 249     }
 250 }
 251
 252 static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 253     WICDecodeOptions cacheOptions)
 254 {
 255     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 256     LARGE_INTEGER seek;
 257     HRESULT hr=S_OK;
 258     png_bytep *row_pointers=NULL;
 259     UINT image_size;
 260     UINT i;
 261     int color_type, bit_depth;
 262     png_bytep trans;
 263     int num_trans;
 264     png_uint_32 transparency;
 265     png_color_16p trans_values;
 266     jmp_buf jmpbuf;
 267
 268     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 269
 270     EnterCriticalSection(&This->lock);
 271
 272     /* initialize libpng */
 273     This->png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 274     if (!This->png_ptr)
 275     {
 276         hr = E_FAIL;
 277         goto end;
 278     }
 279
 280     This->info_ptr = ppng_create_info_struct(This->png_ptr);
 281     if (!This->info_ptr)
 282     {
 283         ppng_destroy_read_struct(&This->png_ptr, NULL, NULL);
 284         This->png_ptr = NULL;
 285         hr = E_FAIL;
 286         goto end;
 287     }
 288
 289     This->end_info = ppng_create_info_struct(This->png_ptr);
 290     if (!This->info_ptr)
 291     {
 292         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, NULL);
 293         This->png_ptr = NULL;
 294         hr = E_FAIL;
 295         goto end;
 296     }
 297
 298     /* set up setjmp/longjmp error handling */
 299     if (setjmp(jmpbuf))
 300     {
 301         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 302         HeapFree(GetProcessHeap(), 0, row_pointers);
 303         This->png_ptr = NULL;
 304         hr = E_FAIL;
 305         goto end;
 306     }
 307     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
 308
 309     /* seek to the start of the stream */
 310     seek.QuadPart = 0;
 311     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 312     if (FAILED(hr)) goto end;
 313
 314     /* set up custom i/o handling */
 315     ppng_set_read_fn(This->png_ptr, pIStream, user_read_data);
 316
 317     /* read the header */
 318     ppng_read_info(This->png_ptr, This->info_ptr);
 319
 320     /* choose a pixel format */
 321     color_type = ppng_get_color_type(This->png_ptr, This->info_ptr);
 322     bit_depth = ppng_get_bit_depth(This->png_ptr, This->info_ptr);
 323
 324     /* check for color-keyed alpha */
 325     transparency = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 326
 327     if (transparency && color_type != PNG_COLOR_TYPE_PALETTE)
 328     {
 329         /* expand to RGBA */
 330         if (color_type == PNG_COLOR_TYPE_GRAY)
 331         {
 332             if (bit_depth < 8)
 333             {
 334 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 335                 ppng_set_expand_gray_1_2_4_to_8(This->png_ptr);
 336 #else
 337                 ppng_set_gray_1_2_4_to_8(This->png_ptr);
 338 #endif
 339                 bit_depth = 8;
 340             }
 341             ppng_set_gray_to_rgb(This->png_ptr);
 342         }
 343         ppng_set_tRNS_to_alpha(This->png_ptr);
 344         color_type = PNG_COLOR_TYPE_RGB_ALPHA;
 345     }
 346
 347     switch (color_type)
 348     {
 349     case PNG_COLOR_TYPE_GRAY:
 350         This->bpp = bit_depth;
 351         switch (bit_depth)
 352         {
 353         case 1: This->format = &GUID_WICPixelFormatBlackWhite; break;
 354         case 2: This->format = &GUID_WICPixelFormat2bppGray; break;
 355         case 4: This->format = &GUID_WICPixelFormat4bppGray; break;
 356         case 8: This->format = &GUID_WICPixelFormat8bppGray; break;
 357         case 16: This->format = &GUID_WICPixelFormat16bppGray; break;
 358         default:
 359             ERR("invalid grayscale bit depth: %i\n", bit_depth);
 360             hr = E_FAIL;
 361             goto end;
 362         }
 363         break;
 364     case PNG_COLOR_TYPE_GRAY_ALPHA:
 365         /* WIC does not support grayscale alpha formats so use RGBA */
 366         ppng_set_gray_to_rgb(This->png_ptr);
 367         /* fall through */
 368     case PNG_COLOR_TYPE_RGB_ALPHA:
 369         This->bpp = bit_depth * 4;
 370         switch (bit_depth)
 371         {
 372         case 8:
 373             ppng_set_bgr(This->png_ptr);
 374             This->format = &GUID_WICPixelFormat32bppBGRA;
 375             break;
 376         case 16: This->format = &GUID_WICPixelFormat64bppRGBA; break;
 377         default:
 378             ERR("invalid RGBA bit depth: %i\n", bit_depth);
 379             hr = E_FAIL;
 380             goto end;
 381         }
 382         break;
 383     case PNG_COLOR_TYPE_PALETTE:
 384         This->bpp = bit_depth;
 385         switch (bit_depth)
 386         {
 387         case 1: This->format = &GUID_WICPixelFormat1bppIndexed; break;
 388         case 2: This->format = &GUID_WICPixelFormat2bppIndexed; break;
 389         case 4: This->format = &GUID_WICPixelFormat4bppIndexed; break;
 390         case 8: This->format = &GUID_WICPixelFormat8bppIndexed; break;
 391         default:
 392             ERR("invalid indexed color bit depth: %i\n", bit_depth);
 393             hr = E_FAIL;
 394             goto end;
 395         }
 396         break;
 397     case PNG_COLOR_TYPE_RGB:
 398         This->bpp = bit_depth * 3;
 399         switch (bit_depth)
 400         {
 401         case 8:
 402             ppng_set_bgr(This->png_ptr);
 403             This->format = &GUID_WICPixelFormat24bppBGR;
 404             break;
 405         case 16: This->format = &GUID_WICPixelFormat48bppRGB; break;
 406         default:
 407             ERR("invalid RGB color bit depth: %i\n", bit_depth);
 408             hr = E_FAIL;
 409             goto end;
 410         }
 411         break;
 412     default:
 413         ERR("invalid color type %i\n", color_type);
 414         hr = E_FAIL;
 415         goto end;
 416     }
 417
 418     /* read the image data */
 419     This->width = ppng_get_image_width(This->png_ptr, This->info_ptr);
 420     This->height = ppng_get_image_height(This->png_ptr, This->info_ptr);
 421     This->stride = This->width * This->bpp;
 422     image_size = This->stride * This->height;
 423
 424     This->image_bits = HeapAlloc(GetProcessHeap(), 0, image_size);
 425     if (!This->image_bits)
 426     {
 427         hr = E_OUTOFMEMORY;
 428         goto end;
 429     }
 430
 431     row_pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(png_bytep)*This->height);
 432     if (!row_pointers)
 433     {
 434         hr = E_OUTOFMEMORY;
 435         goto end;
 436     }
 437
 438     for (i=0; i<This->height; i++)
 439         row_pointers[i] = This->image_bits + i * This->stride;
 440
 441     ppng_read_image(This->png_ptr, row_pointers);
 442
 443     HeapFree(GetProcessHeap(), 0, row_pointers);
 444     row_pointers = NULL;
 445
 446     ppng_read_end(This->png_ptr, This->end_info);
 447
 448     This->initialized = TRUE;
 449
 450 end:
 451
 452     LeaveCriticalSection(&This->lock);
 453
 454     return hr;
 455 }
 456
 457 static HRESULT WINAPI PngDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 458     GUID *pguidContainerFormat)
 459 {
 460     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 461     return S_OK;
 462 }
 463
 464 static HRESULT WINAPI PngDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 465     IWICBitmapDecoderInfo **ppIDecoderInfo)
 466 {
 467     HRESULT hr;
 468     IWICComponentInfo *compinfo;
 469
 470     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 471
 472     hr = CreateComponentInfo(&CLSID_WICPngDecoder, &compinfo);
 473     if (FAILED(hr)) return hr;
 474
 475     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 476         (void**)ppIDecoderInfo);
 477
 478     IWICComponentInfo_Release(compinfo);
 479
 480     return hr;
 481 }
 482
 483 static HRESULT WINAPI PngDecoder_CopyPalette(IWICBitmapDecoder *iface,
 484     IWICPalette *pIPalette)
 485 {
 486     FIXME("(%p,%p): stub\n", iface, pIPalette);
 487     return E_NOTIMPL;
 488 }
 489
 490 static HRESULT WINAPI PngDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 491     IWICMetadataQueryReader **ppIMetadataQueryReader)
 492 {
 493     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 494     return E_NOTIMPL;
 495 }
 496
 497 static HRESULT WINAPI PngDecoder_GetPreview(IWICBitmapDecoder *iface,
 498     IWICBitmapSource **ppIBitmapSource)
 499 {
 500     FIXME("(%p,%p): stub\n", iface, ppIBitmapSource);
 501     return E_NOTIMPL;
 502 }
 503
 504 static HRESULT WINAPI PngDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 505     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 506 {
 507     FIXME("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 508     return E_NOTIMPL;
 509 }
 510
 511 static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 512     IWICBitmapSource **ppIThumbnail)
 513 {
 514     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 515     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 516 }
 517
 518 static HRESULT WINAPI PngDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 519     UINT *pCount)
 520 {
 521     *pCount = 1;
 522     return S_OK;
 523 }
 524
 525 static HRESULT WINAPI PngDecoder_GetFrame(IWICBitmapDecoder *iface,
 526     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 527 {
 528     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 529     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 530
 531     if (!This->initialized) return WINCODEC_ERR_NOTINITIALIZED;
 532
 533     if (index != 0) return E_INVALIDARG;
 534
 535     IWICBitmapDecoder_AddRef(iface);
 536
 537     *ppIBitmapFrame = &This->IWICBitmapFrameDecode_iface;
 538
 539     return S_OK;
 540 }
 541
 542 static const IWICBitmapDecoderVtbl PngDecoder_Vtbl = {
 543     PngDecoder_QueryInterface,
 544     PngDecoder_AddRef,
 545     PngDecoder_Release,
 546     PngDecoder_QueryCapability,
 547     PngDecoder_Initialize,
 548     PngDecoder_GetContainerFormat,
 549     PngDecoder_GetDecoderInfo,
 550     PngDecoder_CopyPalette,
 551     PngDecoder_GetMetadataQueryReader,
 552     PngDecoder_GetPreview,
 553     PngDecoder_GetColorContexts,
 554     PngDecoder_GetThumbnail,
 555     PngDecoder_GetFrameCount,
 556     PngDecoder_GetFrame
 557 };
 558
 559 static HRESULT WINAPI PngDecoder_Frame_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
 560     void **ppv)
 561 {
 562     if (!ppv) return E_INVALIDARG;
 563
 564     if (IsEqualIID(&IID_IUnknown, iid) ||
 565         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 566         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 567     {
 568         *ppv = iface;
 569     }
 570     else
 571     {
 572         *ppv = NULL;
 573         return E_NOINTERFACE;
 574     }
 575
 576     IUnknown_AddRef((IUnknown*)*ppv);
 577     return S_OK;
 578 }
 579
 580 static ULONG WINAPI PngDecoder_Frame_AddRef(IWICBitmapFrameDecode *iface)
 581 {
 582     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 583     return IUnknown_AddRef((IUnknown*)This);
 584 }
 585
 586 static ULONG WINAPI PngDecoder_Frame_Release(IWICBitmapFrameDecode *iface)
 587 {
 588     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 589     return IUnknown_Release((IUnknown*)This);
 590 }
 591
 592 static HRESULT WINAPI PngDecoder_Frame_GetSize(IWICBitmapFrameDecode *iface,
 593     UINT *puiWidth, UINT *puiHeight)
 594 {
 595     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 596     *puiWidth = This->width;
 597     *puiHeight = This->height;
 598     TRACE("(%p)->(%u,%u)\n", iface, *puiWidth, *puiHeight);
 599     return S_OK;
 600 }
 601
 602 static HRESULT WINAPI PngDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *iface,
 603     WICPixelFormatGUID *pPixelFormat)
 604 {
 605     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 606     TRACE("(%p,%p)\n", iface, pPixelFormat);
 607
 608     memcpy(pPixelFormat, This->format, sizeof(GUID));
 609
 610     return S_OK;
 611 }
 612
 613 static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
 614     double *pDpiX, double *pDpiY)
 615 {
 616     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 617     png_uint_32 ret, xres, yres;
 618     int unit_type;
 619
 620     EnterCriticalSection(&This->lock);
 621
 622     ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
 623
 624     if (ret && unit_type == PNG_RESOLUTION_METER)
 625     {
 626         *pDpiX = xres * 0.0254;
 627         *pDpiY = yres * 0.0254;
 628     }
 629     else
 630     {
 631         WARN("no pHYs block present\n");
 632         *pDpiX = *pDpiY = 96.0;
 633     }
 634
 635     LeaveCriticalSection(&This->lock);
 636
 637     TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
 638
 639     return S_OK;
 640 }
 641
 642 static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
 643     IWICPalette *pIPalette)
 644 {
 645     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 646     png_uint_32 ret;
 647     png_colorp png_palette;
 648     int num_palette;
 649     WICColor palette[256];
 650     png_bytep trans;
 651     int num_trans;
 652     png_color_16p trans_values;
 653     int i;
 654     HRESULT hr=S_OK;
 655
 656     TRACE("(%p,%p)\n", iface, pIPalette);
 657
 658     EnterCriticalSection(&This->lock);
 659
 660     ret = ppng_get_PLTE(This->png_ptr, This->info_ptr, &png_palette, &num_palette);
 661     if (!ret)
 662     {
 663         hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 664         goto end;
 665     }
 666
 667     if (num_palette > 256)
 668     {
 669         ERR("palette has %i colors?!\n", num_palette);
 670         hr = E_FAIL;
 671         goto end;
 672     }
 673
 674     for (i=0; i<num_palette; i++)
 675     {
 676         palette[i] = (0xff000000|
 677                       png_palette[i].red << 16|
 678                       png_palette[i].green << 8|
 679                       png_palette[i].blue);
 680     }
 681
 682     ret = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 683     if (ret)
 684     {
 685         for (i=0; i<num_trans; i++)
 686         {
 687             palette[trans[i]] = 0x00000000;
 688         }
 689     }
 690
 691 end:
 692
 693     LeaveCriticalSection(&This->lock);
 694
 695     if (SUCCEEDED(hr))
 696         hr = IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
 697
 698     return hr;
 699 }
 700
 701 static HRESULT WINAPI PngDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
 702     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 703 {
 704     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 705     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 706
 707     return copy_pixels(This->bpp, This->image_bits,
 708         This->width, This->height, This->stride,
 709         prc, cbStride, cbBufferSize, pbBuffer);
 710 }
 711
 712 static HRESULT WINAPI PngDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 713     IWICMetadataQueryReader **ppIMetadataQueryReader)
 714 {
 715     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 716     return E_NOTIMPL;
 717 }
 718
 719 static HRESULT WINAPI PngDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *iface,
 720     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 721 {
 722     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
 723     return E_NOTIMPL;
 724 }
 725
 726 static HRESULT WINAPI PngDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
 727     IWICBitmapSource **ppIThumbnail)
 728 {
 729     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 730     return E_NOTIMPL;
 731 }
 732
 733 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl = {
 734     PngDecoder_Frame_QueryInterface,
 735     PngDecoder_Frame_AddRef,
 736     PngDecoder_Frame_Release,
 737     PngDecoder_Frame_GetSize,
 738     PngDecoder_Frame_GetPixelFormat,
 739     PngDecoder_Frame_GetResolution,
 740     PngDecoder_Frame_CopyPalette,
 741     PngDecoder_Frame_CopyPixels,
 742     PngDecoder_Frame_GetMetadataQueryReader,
 743     PngDecoder_Frame_GetColorContexts,
 744     PngDecoder_Frame_GetThumbnail
 745 };
 746
 747 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 748 {
 749     PngDecoder *This;
 750     HRESULT ret;
 751
 752     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 753
 754     *ppv = NULL;
 755
 756     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 757
 758     if (!libpng_handle && !load_libpng())
 759     {
 760         ERR("Failed reading PNG because unable to find %s\n",SONAME_LIBPNG);
 761         return E_FAIL;
 762     }
 763
 764     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngDecoder));
 765     if (!This) return E_OUTOFMEMORY;
 766
 767     This->IWICBitmapDecoder_iface.lpVtbl = &PngDecoder_Vtbl;
 768     This->IWICBitmapFrameDecode_iface.lpVtbl = &PngDecoder_FrameVtbl;
 769     This->ref = 1;
 770     This->png_ptr = NULL;
 771     This->info_ptr = NULL;
 772     This->end_info = NULL;
 773     This->initialized = FALSE;
 774     This->image_bits = NULL;
 775     InitializeCriticalSection(&This->lock);
 776     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngDecoder.lock");
 777
 778     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
 779     IUnknown_Release((IUnknown*)This);
 780
 781     return ret;
 782 }
 783
 784 struct png_pixelformat {
 785     const WICPixelFormatGUID *guid;
 786     UINT bpp;
 787     int bit_depth;
 788     int color_type;
 789     BOOL remove_filler;
 790     BOOL swap_rgb;
 791 };
 792
 793 static const struct png_pixelformat formats[] = {
 794     {&GUID_WICPixelFormat24bppBGR, 24, 8, PNG_COLOR_TYPE_RGB, 0, 1},
 795     {&GUID_WICPixelFormatBlackWhite, 1, 1, PNG_COLOR_TYPE_GRAY, 0, 0},
 796     {&GUID_WICPixelFormat2bppGray, 2, 2, PNG_COLOR_TYPE_GRAY, 0, 0},
 797     {&GUID_WICPixelFormat4bppGray, 4, 4, PNG_COLOR_TYPE_GRAY, 0, 0},
 798     {&GUID_WICPixelFormat8bppGray, 8, 8, PNG_COLOR_TYPE_GRAY, 0, 0},
 799     {&GUID_WICPixelFormat16bppGray, 16, 16, PNG_COLOR_TYPE_GRAY, 0, 0},
 800     {&GUID_WICPixelFormat32bppBGR, 32, 8, PNG_COLOR_TYPE_RGB, 1, 1},
 801     {&GUID_WICPixelFormat32bppBGRA, 32, 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 1},
 802     {&GUID_WICPixelFormat48bppRGB, 48, 16, PNG_COLOR_TYPE_RGB, 0, 0},
 803     {&GUID_WICPixelFormat64bppRGBA, 64, 16, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0},
 804     {NULL},
 805 };
 806
 807 typedef struct PngEncoder {
 808     IWICBitmapEncoder IWICBitmapEncoder_iface;
 809     IWICBitmapFrameEncode IWICBitmapFrameEncode_iface;
 810     LONG ref;
 811     IStream *stream;
 812     png_structp png_ptr;
 813     png_infop info_ptr;
 814     UINT frame_count;
 815     BOOL frame_initialized;
 816     const struct png_pixelformat *format;
 817     BOOL info_written;
 818     UINT width, height;
 819     double xres, yres;
 820     UINT lines_written;
 821     BOOL frame_committed;
 822     BOOL committed;
 823     CRITICAL_SECTION lock;
 824 } PngEncoder;
 825
 826 static inline PngEncoder *impl_from_IWICBitmapEncoder(IWICBitmapEncoder *iface)
 827 {
 828     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapEncoder_iface);
 829 }
 830
 831 static inline PngEncoder *impl_from_IWICBitmapFrameEncode(IWICBitmapFrameEncode *iface)
 832 {
 833     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapFrameEncode_iface);
 834 }
 835
 836 static HRESULT WINAPI PngFrameEncode_QueryInterface(IWICBitmapFrameEncode *iface, REFIID iid,
 837     void **ppv)
 838 {
 839     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 840     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 841
 842     if (!ppv) return E_INVALIDARG;
 843
 844     if (IsEqualIID(&IID_IUnknown, iid) ||
 845         IsEqualIID(&IID_IWICBitmapFrameEncode, iid))
 846     {
 847         *ppv = &This->IWICBitmapFrameEncode_iface;
 848     }
 849     else
 850     {
 851         *ppv = NULL;
 852         return E_NOINTERFACE;
 853     }
 854
 855     IUnknown_AddRef((IUnknown*)*ppv);
 856     return S_OK;
 857 }
 858
 859 static ULONG WINAPI PngFrameEncode_AddRef(IWICBitmapFrameEncode *iface)
 860 {
 861     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 862     return IUnknown_AddRef((IUnknown*)This);
 863 }
 864
 865 static ULONG WINAPI PngFrameEncode_Release(IWICBitmapFrameEncode *iface)
 866 {
 867     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 868     return IUnknown_Release((IUnknown*)This);
 869 }
 870
 871 static HRESULT WINAPI PngFrameEncode_Initialize(IWICBitmapFrameEncode *iface,
 872     IPropertyBag2 *pIEncoderOptions)
 873 {
 874     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 875     TRACE("(%p,%p)\n", iface, pIEncoderOptions);
 876
 877     EnterCriticalSection(&This->lock);
 878
 879     if (This->frame_initialized)
 880     {
 881         LeaveCriticalSection(&This->lock);
 882         return WINCODEC_ERR_WRONGSTATE;
 883     }
 884
 885     This->frame_initialized = TRUE;
 886
 887     LeaveCriticalSection(&This->lock);
 888
 889     return S_OK;
 890 }
 891
 892 static HRESULT WINAPI PngFrameEncode_SetSize(IWICBitmapFrameEncode *iface,
 893     UINT uiWidth, UINT uiHeight)
 894 {
 895     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 896     TRACE("(%p,%u,%u)\n", iface, uiWidth, uiHeight);
 897
 898     EnterCriticalSection(&This->lock);
 899
 900     if (!This->frame_initialized || This->info_written)
 901     {
 902         LeaveCriticalSection(&This->lock);
 903         return WINCODEC_ERR_WRONGSTATE;
 904     }
 905
 906     This->width = uiWidth;
 907     This->height = uiHeight;
 908
 909     LeaveCriticalSection(&This->lock);
 910
 911     return S_OK;
 912 }
 913
 914 static HRESULT WINAPI PngFrameEncode_SetResolution(IWICBitmapFrameEncode *iface,
 915     double dpiX, double dpiY)
 916 {
 917     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 918     TRACE("(%p,%0.2f,%0.2f)\n", iface, dpiX, dpiY);
 919
 920     EnterCriticalSection(&This->lock);
 921
 922     if (!This->frame_initialized || This->info_written)
 923     {
 924         LeaveCriticalSection(&This->lock);
 925         return WINCODEC_ERR_WRONGSTATE;
 926     }
 927
 928     This->xres = dpiX;
 929     This->yres = dpiY;
 930
 931     LeaveCriticalSection(&This->lock);
 932
 933     return S_OK;
 934 }
 935
 936 static HRESULT WINAPI PngFrameEncode_SetPixelFormat(IWICBitmapFrameEncode *iface,
 937     WICPixelFormatGUID *pPixelFormat)
 938 {
 939     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 940     int i;
 941     TRACE("(%p,%s)\n", iface, debugstr_guid(pPixelFormat));
 942
 943     EnterCriticalSection(&This->lock);
 944
 945     if (!This->frame_initialized || This->info_written)
 946     {
 947         LeaveCriticalSection(&This->lock);
 948         return WINCODEC_ERR_WRONGSTATE;
 949     }
 950
 951     for (i=0; formats[i].guid; i++)
 952     {
 953         if (memcmp(formats[i].guid, pPixelFormat, sizeof(GUID)) == 0)
 954             break;
 955     }
 956
 957     if (!formats[i].guid) i = 0;
 958
 959     This->format = &formats[i];
 960     memcpy(pPixelFormat, This->format->guid, sizeof(GUID));
 961
 962     LeaveCriticalSection(&This->lock);
 963
 964     return S_OK;
 965 }
 966
 967 static HRESULT WINAPI PngFrameEncode_SetColorContexts(IWICBitmapFrameEncode *iface,
 968     UINT cCount, IWICColorContext **ppIColorContext)
 969 {
 970     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
 971     return E_NOTIMPL;
 972 }
 973
 974 static HRESULT WINAPI PngFrameEncode_SetPalette(IWICBitmapFrameEncode *iface,
 975     IWICPalette *pIPalette)
 976 {
 977     FIXME("(%p,%p): stub\n", iface, pIPalette);
 978     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 979 }
 980
 981 static HRESULT WINAPI PngFrameEncode_SetThumbnail(IWICBitmapFrameEncode *iface,
 982     IWICBitmapSource *pIThumbnail)
 983 {
 984     FIXME("(%p,%p): stub\n", iface, pIThumbnail);
 985     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 986 }
 987
 988 static HRESULT WINAPI PngFrameEncode_WritePixels(IWICBitmapFrameEncode *iface,
 989     UINT lineCount, UINT cbStride, UINT cbBufferSize, BYTE *pbPixels)
 990 {
 991     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
 992     png_byte **row_pointers=NULL;
 993     UINT i;
 994     jmp_buf jmpbuf;
 995     TRACE("(%p,%u,%u,%u,%p)\n", iface, lineCount, cbStride, cbBufferSize, pbPixels);
 996
 997     EnterCriticalSection(&This->lock);
 998
 999     if (!This->frame_initialized || !This->width || !This->height || !This->format)
1000     {
1001         LeaveCriticalSection(&This->lock);
1002         return WINCODEC_ERR_WRONGSTATE;
1003     }
1004
1005     if (lineCount == 0 || lineCount + This->lines_written > This->height)
1006     {
1007         LeaveCriticalSection(&This->lock);
1008         return E_INVALIDARG;
1009     }
1010
1011     /* set up setjmp/longjmp error handling */
1012     if (setjmp(jmpbuf))
1013     {
1014         LeaveCriticalSection(&This->lock);
1015         HeapFree(GetProcessHeap(), 0, row_pointers);
1016         return E_FAIL;
1017     }
1018     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1019
1020     if (!This->info_written)
1021     {
1022         ppng_set_IHDR(This->png_ptr, This->info_ptr, This->width, This->height,
1023             This->format->bit_depth, This->format->color_type, PNG_INTERLACE_NONE,
1024             PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1025
1026         if (This->xres != 0.0 && This->yres != 0.0)
1027         {
1028             ppng_set_pHYs(This->png_ptr, This->info_ptr, (This->xres+0.0127) / 0.0254,
1029                 (This->yres+0.0127) / 0.0254, PNG_RESOLUTION_METER);
1030         }
1031
1032         ppng_write_info(This->png_ptr, This->info_ptr);
1033
1034         if (This->format->remove_filler)
1035             ppng_set_filler(This->png_ptr, 0, PNG_FILLER_AFTER);
1036
1037         if (This->format->swap_rgb)
1038             ppng_set_bgr(This->png_ptr);
1039
1040         This->info_written = TRUE;
1041     }
1042
1043     row_pointers = HeapAlloc(GetProcessHeap(), 0, lineCount * sizeof(png_byte*));
1044     if (!row_pointers)
1045     {
1046         LeaveCriticalSection(&This->lock);
1047         return E_OUTOFMEMORY;
1048     }
1049
1050     for (i=0; i<lineCount; i++)
1051         row_pointers[i] = pbPixels + cbStride * i;
1052
1053     ppng_write_rows(This->png_ptr, row_pointers, lineCount);
1054     This->lines_written += lineCount;
1055
1056     LeaveCriticalSection(&This->lock);
1057
1058     HeapFree(GetProcessHeap(), 0, row_pointers);
1059
1060     return S_OK;
1061 }
1062
1063 static HRESULT WINAPI PngFrameEncode_WriteSource(IWICBitmapFrameEncode *iface,
1064     IWICBitmapSource *pIBitmapSource, WICRect *prc)
1065 {
1066     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1067     HRESULT hr;
1068     WICRect rc;
1069     WICPixelFormatGUID guid;
1070     UINT stride;
1071     BYTE *pixeldata;
1072     TRACE("(%p,%p,%p)\n", iface, pIBitmapSource, prc);
1073
1074     if (!This->frame_initialized || !This->width || !This->height)
1075         return WINCODEC_ERR_WRONGSTATE;
1076
1077     if (!This->format)
1078     {
1079         hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1080         if (FAILED(hr)) return hr;
1081         hr = IWICBitmapFrameEncode_SetPixelFormat(iface, &guid);
1082         if (FAILED(hr)) return hr;
1083     }
1084
1085     hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1086     if (FAILED(hr)) return hr;
1087     if (memcmp(&guid, This->format->guid, sizeof(GUID)) != 0)
1088     {
1089         /* FIXME: should use WICConvertBitmapSource to convert */
1090         ERR("format %s unsupported\n", debugstr_guid(&guid));
1091         return E_FAIL;
1092     }
1093
1094     if (This->xres == 0.0 || This->yres == 0.0)
1095     {
1096         double xres, yres;
1097         hr = IWICBitmapSource_GetResolution(pIBitmapSource, &xres, &yres);
1098         if (FAILED(hr)) return hr;
1099         hr = IWICBitmapFrameEncode_SetResolution(iface, xres, yres);
1100         if (FAILED(hr)) return hr;
1101     }
1102
1103     if (!prc)
1104     {
1105         UINT width, height;
1106         hr = IWICBitmapSource_GetSize(pIBitmapSource, &width, &height);
1107         if (FAILED(hr)) return hr;
1108         rc.X = 0;
1109         rc.Y = 0;
1110         rc.Width = width;
1111         rc.Height = height;
1112         prc = &rc;
1113     }
1114
1115     if (prc->Width != This->width) return E_INVALIDARG;
1116
1117     stride = (This->format->bpp * This->width + 7)/8;
1118
1119     pixeldata = HeapAlloc(GetProcessHeap(), 0, stride * prc->Height);
1120     if (!pixeldata) return E_OUTOFMEMORY;
1121
1122     hr = IWICBitmapSource_CopyPixels(pIBitmapSource, prc, stride,
1123         stride*prc->Height, pixeldata);
1124
1125     if (SUCCEEDED(hr))
1126     {
1127         hr = IWICBitmapFrameEncode_WritePixels(iface, prc->Height, stride,
1128             stride*prc->Height, pixeldata);
1129     }
1130
1131     HeapFree(GetProcessHeap(), 0, pixeldata);
1132
1133     return hr;
1134 }
1135
1136 static HRESULT WINAPI PngFrameEncode_Commit(IWICBitmapFrameEncode *iface)
1137 {
1138     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1139     jmp_buf jmpbuf;
1140     TRACE("(%p)\n", iface);
1141
1142     EnterCriticalSection(&This->lock);
1143
1144     if (!This->info_written || This->lines_written != This->height || This->frame_committed)
1145     {
1146         LeaveCriticalSection(&This->lock);
1147         return WINCODEC_ERR_WRONGSTATE;
1148     }
1149
1150     /* set up setjmp/longjmp error handling */
1151     if (setjmp(jmpbuf))
1152     {
1153         LeaveCriticalSection(&This->lock);
1154         return E_FAIL;
1155     }
1156     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1157
1158     ppng_write_end(This->png_ptr, This->info_ptr);
1159
1160     This->frame_committed = TRUE;
1161
1162     LeaveCriticalSection(&This->lock);
1163
1164     return S_OK;
1165 }
1166
1167 static HRESULT WINAPI PngFrameEncode_GetMetadataQueryWriter(IWICBitmapFrameEncode *iface,
1168     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1169 {
1170     FIXME("(%p, %p): stub\n", iface, ppIMetadataQueryWriter);
1171     return E_NOTIMPL;
1172 }
1173
1174 static const IWICBitmapFrameEncodeVtbl PngEncoder_FrameVtbl = {
1175     PngFrameEncode_QueryInterface,
1176     PngFrameEncode_AddRef,
1177     PngFrameEncode_Release,
1178     PngFrameEncode_Initialize,
1179     PngFrameEncode_SetSize,
1180     PngFrameEncode_SetResolution,
1181     PngFrameEncode_SetPixelFormat,
1182     PngFrameEncode_SetColorContexts,
1183     PngFrameEncode_SetPalette,
1184     PngFrameEncode_SetThumbnail,
1185     PngFrameEncode_WritePixels,
1186     PngFrameEncode_WriteSource,
1187     PngFrameEncode_Commit,
1188     PngFrameEncode_GetMetadataQueryWriter
1189 };
1190
1191 static HRESULT WINAPI PngEncoder_QueryInterface(IWICBitmapEncoder *iface, REFIID iid,
1192     void **ppv)
1193 {
1194     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1195     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1196
1197     if (!ppv) return E_INVALIDARG;
1198
1199     if (IsEqualIID(&IID_IUnknown, iid) ||
1200         IsEqualIID(&IID_IWICBitmapEncoder, iid))
1201     {
1202         *ppv = This;
1203     }
1204     else
1205     {
1206         *ppv = NULL;
1207         return E_NOINTERFACE;
1208     }
1209
1210     IUnknown_AddRef((IUnknown*)*ppv);
1211     return S_OK;
1212 }
1213
1214 static ULONG WINAPI PngEncoder_AddRef(IWICBitmapEncoder *iface)
1215 {
1216     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1217     ULONG ref = InterlockedIncrement(&This->ref);
1218
1219     TRACE("(%p) refcount=%u\n", iface, ref);
1220
1221     return ref;
1222 }
1223
1224 static ULONG WINAPI PngEncoder_Release(IWICBitmapEncoder *iface)
1225 {
1226     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1227     ULONG ref = InterlockedDecrement(&This->ref);
1228
1229     TRACE("(%p) refcount=%u\n", iface, ref);
1230
1231     if (ref == 0)
1232     {
1233         This->lock.DebugInfo->Spare[0] = 0;
1234         DeleteCriticalSection(&This->lock);
1235         if (This->png_ptr)
1236             ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1237         if (This->stream)
1238             IStream_Release(This->stream);
1239         HeapFree(GetProcessHeap(), 0, This);
1240     }
1241
1242     return ref;
1243 }
1244
1245 static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1246 {
1247     PngEncoder *This = ppng_get_io_ptr(png_ptr);
1248     HRESULT hr;
1249     ULONG byteswritten;
1250
1251     hr = IStream_Write(This->stream, data, length, &byteswritten);
1252     if (FAILED(hr) || byteswritten != length)
1253     {
1254         ppng_error(png_ptr, "failed writing data");
1255     }
1256 }
1257
1258 static void user_flush(png_structp png_ptr)
1259 {
1260 }
1261
1262 static HRESULT WINAPI PngEncoder_Initialize(IWICBitmapEncoder *iface,
1263     IStream *pIStream, WICBitmapEncoderCacheOption cacheOption)
1264 {
1265     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1266     jmp_buf jmpbuf;
1267
1268     TRACE("(%p,%p,%u)\n", iface, pIStream, cacheOption);
1269
1270     EnterCriticalSection(&This->lock);
1271
1272     if (This->png_ptr)
1273     {
1274         LeaveCriticalSection(&This->lock);
1275         return WINCODEC_ERR_WRONGSTATE;
1276     }
1277
1278     /* initialize libpng */
1279     This->png_ptr = ppng_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1280     if (!This->png_ptr)
1281     {
1282         LeaveCriticalSection(&This->lock);
1283         return E_FAIL;
1284     }
1285
1286     This->info_ptr = ppng_create_info_struct(This->png_ptr);
1287     if (!This->info_ptr)
1288     {
1289         ppng_destroy_write_struct(&This->png_ptr, NULL);
1290         This->png_ptr = NULL;
1291         LeaveCriticalSection(&This->lock);
1292         return E_FAIL;
1293     }
1294
1295     IStream_AddRef(pIStream);
1296     This->stream = pIStream;
1297
1298     /* set up setjmp/longjmp error handling */
1299     if (setjmp(jmpbuf))
1300     {
1301         ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1302         This->png_ptr = NULL;
1303         IStream_Release(This->stream);
1304         This->stream = NULL;
1305         LeaveCriticalSection(&This->lock);
1306         return E_FAIL;
1307     }
1308     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1309
1310     /* set up custom i/o handling */
1311     ppng_set_write_fn(This->png_ptr, This, user_write_data, user_flush);
1312
1313     LeaveCriticalSection(&This->lock);
1314
1315     return S_OK;
1316 }
1317
1318 static HRESULT WINAPI PngEncoder_GetContainerFormat(IWICBitmapEncoder *iface,
1319     GUID *pguidContainerFormat)
1320 {
1321     FIXME("(%p,%s): stub\n", iface, debugstr_guid(pguidContainerFormat));
1322     return E_NOTIMPL;
1323 }
1324
1325 static HRESULT WINAPI PngEncoder_GetEncoderInfo(IWICBitmapEncoder *iface,
1326     IWICBitmapEncoderInfo **ppIEncoderInfo)
1327 {
1328     FIXME("(%p,%p): stub\n", iface, ppIEncoderInfo);
1329     return E_NOTIMPL;
1330 }
1331
1332 static HRESULT WINAPI PngEncoder_SetColorContexts(IWICBitmapEncoder *iface,
1333     UINT cCount, IWICColorContext **ppIColorContext)
1334 {
1335     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1336     return E_NOTIMPL;
1337 }
1338
1339 static HRESULT WINAPI PngEncoder_SetPalette(IWICBitmapEncoder *iface, IWICPalette *pIPalette)
1340 {
1341     TRACE("(%p,%p)\n", iface, pIPalette);
1342     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1343 }
1344
1345 static HRESULT WINAPI PngEncoder_SetThumbnail(IWICBitmapEncoder *iface, IWICBitmapSource *pIThumbnail)
1346 {
1347     TRACE("(%p,%p)\n", iface, pIThumbnail);
1348     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1349 }
1350
1351 static HRESULT WINAPI PngEncoder_SetPreview(IWICBitmapEncoder *iface, IWICBitmapSource *pIPreview)
1352 {
1353     TRACE("(%p,%p)\n", iface, pIPreview);
1354     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1355 }
1356
1357 static HRESULT WINAPI PngEncoder_CreateNewFrame(IWICBitmapEncoder *iface,
1358     IWICBitmapFrameEncode **ppIFrameEncode, IPropertyBag2 **ppIEncoderOptions)
1359 {
1360     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1361     HRESULT hr;
1362     TRACE("(%p,%p,%p)\n", iface, ppIFrameEncode, ppIEncoderOptions);
1363
1364     EnterCriticalSection(&This->lock);
1365
1366     if (This->frame_count != 0)
1367     {
1368         LeaveCriticalSection(&This->lock);
1369         return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1370     }
1371
1372     if (!This->stream)
1373     {
1374         LeaveCriticalSection(&This->lock);
1375         return WINCODEC_ERR_NOTINITIALIZED;
1376     }
1377
1378     hr = CreatePropertyBag2(ppIEncoderOptions);
1379     if (FAILED(hr))
1380     {
1381         LeaveCriticalSection(&This->lock);
1382         return hr;
1383     }
1384
1385     This->frame_count = 1;
1386
1387     LeaveCriticalSection(&This->lock);
1388
1389     IWICBitmapEncoder_AddRef(iface);
1390     *ppIFrameEncode = &This->IWICBitmapFrameEncode_iface;
1391
1392     return S_OK;
1393 }
1394
1395 static HRESULT WINAPI PngEncoder_Commit(IWICBitmapEncoder *iface)
1396 {
1397     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1398     TRACE("(%p)\n", iface);
1399
1400     EnterCriticalSection(&This->lock);
1401
1402     if (!This->frame_committed || This->committed)
1403     {
1404         LeaveCriticalSection(&This->lock);
1405         return WINCODEC_ERR_WRONGSTATE;
1406     }
1407
1408     This->committed = TRUE;
1409
1410     LeaveCriticalSection(&This->lock);
1411
1412     return S_OK;
1413 }
1414
1415 static HRESULT WINAPI PngEncoder_GetMetadataQueryWriter(IWICBitmapEncoder *iface,
1416     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1417 {
1418     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryWriter);
1419     return E_NOTIMPL;
1420 }
1421
1422 static const IWICBitmapEncoderVtbl PngEncoder_Vtbl = {
1423     PngEncoder_QueryInterface,
1424     PngEncoder_AddRef,
1425     PngEncoder_Release,
1426     PngEncoder_Initialize,
1427     PngEncoder_GetContainerFormat,
1428     PngEncoder_GetEncoderInfo,
1429     PngEncoder_SetColorContexts,
1430     PngEncoder_SetPalette,
1431     PngEncoder_SetThumbnail,
1432     PngEncoder_SetPreview,
1433     PngEncoder_CreateNewFrame,
1434     PngEncoder_Commit,
1435     PngEncoder_GetMetadataQueryWriter
1436 };
1437
1438 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1439 {
1440     PngEncoder *This;
1441     HRESULT ret;
1442
1443     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1444
1445     *ppv = NULL;
1446
1447     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1448
1449     if (!libpng_handle && !load_libpng())
1450     {
1451         ERR("Failed writing PNG because unable to find %s\n",SONAME_LIBPNG);
1452         return E_FAIL;
1453     }
1454
1455     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngEncoder));
1456     if (!This) return E_OUTOFMEMORY;
1457
1458     This->IWICBitmapEncoder_iface.lpVtbl = &PngEncoder_Vtbl;
1459     This->IWICBitmapFrameEncode_iface.lpVtbl = &PngEncoder_FrameVtbl;
1460     This->ref = 1;
1461     This->png_ptr = NULL;
1462     This->info_ptr = NULL;
1463     This->stream = NULL;
1464     This->frame_count = 0;
1465     This->frame_initialized = FALSE;
1466     This->format = NULL;
1467     This->info_written = FALSE;
1468     This->width = 0;
1469     This->height = 0;
1470     This->xres = 0.0;
1471     This->yres = 0.0;
1472     This->lines_written = 0;
1473     This->frame_committed = FALSE;
1474     This->committed = FALSE;
1475     InitializeCriticalSection(&This->lock);
1476     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngEncoder.lock");
1477
1478     ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
1479     IUnknown_Release((IUnknown*)This);
1480
1481     return ret;
1482 }
1483
1484 #else /* !HAVE_PNG_H */
1485
1486 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1487 {
1488     ERR("Trying to load PNG picture, but PNG support is not compiled in.\n");
1489     return E_FAIL;
1490 }
1491
1492 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1493 {
1494     ERR("Trying to save PNG picture, but PNG support is not compiled in.\n");
1495     return E_FAIL;
1496 }
1497
1498 #endif