git.oblomov.eu Git - wine/blob - 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 NONAMELESSUNION
  29 #define COBJMACROS
  30
  31 #include "windef.h"
  32 #include "winbase.h"
  33 #include "objbase.h"
  34 #include "wincodec.h"
  35 #include "wincodecsdk.h"
  36
  37 #include "wincodecs_private.h"
  38
  39 #include "wine/debug.h"
  40 #include "wine/library.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  43
  44 static HRESULT read_png_chunk(IStream *stream, BYTE *type, BYTE **data, ULONG *data_size)
  45 {
  46     BYTE header[8];
  47     HRESULT hr;
  48     ULONG bytesread;
  49
  50     hr = IStream_Read(stream, header, 8, &bytesread);
  51     if (FAILED(hr) || bytesread < 8)
  52     {
  53         if (SUCCEEDED(hr))
  54             hr = E_FAIL;
  55         return hr;
  56     }
  57
  58     *data_size = header[0] << 24 | header[1] << 16 | header[2] << 8 | header[3];
  59
  60     memcpy(type, &header[4], 4);
  61
  62     if (data)
  63     {
  64         *data = HeapAlloc(GetProcessHeap(), 0, *data_size);
  65         if (!*data)
  66             return E_OUTOFMEMORY;
  67
  68         hr = IStream_Read(stream, *data, *data_size, &bytesread);
  69
  70         if (FAILED(hr) || bytesread < *data_size)
  71         {
  72             if (SUCCEEDED(hr))
  73                 hr = E_FAIL;
  74             HeapFree(GetProcessHeap(), 0, *data);
  75             *data = NULL;
  76             return hr;
  77         }
  78
  79         /* FIXME: Verify the CRC? */
  80     }
  81
  82     return S_OK;
  83 }
  84
  85 static HRESULT LoadTextMetadata(IStream *stream, const GUID *preferred_vendor,
  86     DWORD persist_options, MetadataItem **items, DWORD *item_count)
  87 {
  88     HRESULT hr;
  89     BYTE type[4];
  90     BYTE *data;
  91     ULONG data_size;
  92     ULONG name_len, value_len;
  93     BYTE *name_end_ptr;
  94     LPSTR name, value;
  95     MetadataItem *result;
  96
  97     hr = read_png_chunk(stream, type, &data, &data_size);
  98     if (FAILED(hr)) return hr;
  99
 100     name_end_ptr = memchr(data, 0, data_size);
 101
 102     name_len = name_end_ptr - data;
 103
 104     if (!name_end_ptr || name_len > 79)
 105     {
 106         HeapFree(GetProcessHeap(), 0, data);
 107         return E_FAIL;
 108     }
 109
 110     value_len = data_size - name_len - 1;
 111
 112     result = HeapAlloc(GetProcessHeap(), 0, sizeof(MetadataItem));
 113     name = HeapAlloc(GetProcessHeap(), 0, name_len + 1);
 114     value = HeapAlloc(GetProcessHeap(), 0, value_len + 1);
 115     if (!result || !name || !value)
 116     {
 117         HeapFree(GetProcessHeap(), 0, data);
 118         HeapFree(GetProcessHeap(), 0, result);
 119         HeapFree(GetProcessHeap(), 0, name);
 120         HeapFree(GetProcessHeap(), 0, value);
 121         return E_OUTOFMEMORY;
 122     }
 123
 124     PropVariantInit(&result[0].schema);
 125     PropVariantInit(&result[0].id);
 126     PropVariantInit(&result[0].value);
 127
 128     memcpy(name, data, name_len + 1);
 129     memcpy(value, name_end_ptr + 1, value_len);
 130     value[value_len] = 0;
 131
 132     result[0].id.vt = VT_LPSTR;
 133     result[0].id.u.pszVal = name;
 134     result[0].value.vt = VT_LPSTR;
 135     result[0].value.u.pszVal = value;
 136
 137     *items = result;
 138     *item_count = 1;
 139
 140     HeapFree(GetProcessHeap(), 0, data);
 141
 142     return S_OK;
 143 }
 144
 145 static const MetadataHandlerVtbl TextReader_Vtbl = {
 146     0,
 147     &CLSID_WICPngTextMetadataReader,
 148     LoadTextMetadata
 149 };
 150
 151 HRESULT PngTextReader_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 152 {
 153     return MetadataReader_Create(&TextReader_Vtbl, pUnkOuter, iid, ppv);
 154 }
 155
 156 #ifdef SONAME_LIBPNG
 157
 158 static void *libpng_handle;
 159 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
 160 MAKE_FUNCPTR(png_create_read_struct);
 161 MAKE_FUNCPTR(png_create_info_struct);
 162 MAKE_FUNCPTR(png_create_write_struct);
 163 MAKE_FUNCPTR(png_destroy_read_struct);
 164 MAKE_FUNCPTR(png_destroy_write_struct);
 165 MAKE_FUNCPTR(png_error);
 166 MAKE_FUNCPTR(png_get_bit_depth);
 167 MAKE_FUNCPTR(png_get_color_type);
 168 MAKE_FUNCPTR(png_get_error_ptr);
 169 MAKE_FUNCPTR(png_get_iCCP);
 170 MAKE_FUNCPTR(png_get_image_height);
 171 MAKE_FUNCPTR(png_get_image_width);
 172 MAKE_FUNCPTR(png_get_io_ptr);
 173 MAKE_FUNCPTR(png_get_pHYs);
 174 MAKE_FUNCPTR(png_get_PLTE);
 175 MAKE_FUNCPTR(png_get_tRNS);
 176 MAKE_FUNCPTR(png_set_bgr);
 177 MAKE_FUNCPTR(png_set_error_fn);
 178 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 179 MAKE_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 180 #else
 181 MAKE_FUNCPTR(png_set_gray_1_2_4_to_8);
 182 #endif
 183 MAKE_FUNCPTR(png_set_filler);
 184 MAKE_FUNCPTR(png_set_gray_to_rgb);
 185 MAKE_FUNCPTR(png_set_IHDR);
 186 MAKE_FUNCPTR(png_set_pHYs);
 187 MAKE_FUNCPTR(png_set_read_fn);
 188 MAKE_FUNCPTR(png_set_strip_16);
 189 MAKE_FUNCPTR(png_set_tRNS_to_alpha);
 190 MAKE_FUNCPTR(png_set_write_fn);
 191 MAKE_FUNCPTR(png_read_end);
 192 MAKE_FUNCPTR(png_read_image);
 193 MAKE_FUNCPTR(png_read_info);
 194 MAKE_FUNCPTR(png_write_end);
 195 MAKE_FUNCPTR(png_write_info);
 196 MAKE_FUNCPTR(png_write_rows);
 197 #undef MAKE_FUNCPTR
 198
 199 static void *load_libpng(void)
 200 {
 201     if((libpng_handle = wine_dlopen(SONAME_LIBPNG, RTLD_NOW, NULL, 0)) != NULL) {
 202
 203 #define LOAD_FUNCPTR(f) \
 204     if((p##f = wine_dlsym(libpng_handle, #f, NULL, 0)) == NULL) { \
 205         libpng_handle = NULL; \
 206         return NULL; \
 207     }
 208         LOAD_FUNCPTR(png_create_read_struct);
 209         LOAD_FUNCPTR(png_create_info_struct);
 210         LOAD_FUNCPTR(png_create_write_struct);
 211         LOAD_FUNCPTR(png_destroy_read_struct);
 212         LOAD_FUNCPTR(png_destroy_write_struct);
 213         LOAD_FUNCPTR(png_error);
 214         LOAD_FUNCPTR(png_get_bit_depth);
 215         LOAD_FUNCPTR(png_get_color_type);
 216         LOAD_FUNCPTR(png_get_error_ptr);
 217         LOAD_FUNCPTR(png_get_iCCP);
 218         LOAD_FUNCPTR(png_get_image_height);
 219         LOAD_FUNCPTR(png_get_image_width);
 220         LOAD_FUNCPTR(png_get_io_ptr);
 221         LOAD_FUNCPTR(png_get_pHYs);
 222         LOAD_FUNCPTR(png_get_PLTE);
 223         LOAD_FUNCPTR(png_get_tRNS);
 224         LOAD_FUNCPTR(png_set_bgr);
 225         LOAD_FUNCPTR(png_set_error_fn);
 226 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 227         LOAD_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
 228 #else
 229         LOAD_FUNCPTR(png_set_gray_1_2_4_to_8);
 230 #endif
 231         LOAD_FUNCPTR(png_set_filler);
 232         LOAD_FUNCPTR(png_set_gray_to_rgb);
 233         LOAD_FUNCPTR(png_set_IHDR);
 234         LOAD_FUNCPTR(png_set_pHYs);
 235         LOAD_FUNCPTR(png_set_read_fn);
 236         LOAD_FUNCPTR(png_set_strip_16);
 237         LOAD_FUNCPTR(png_set_tRNS_to_alpha);
 238         LOAD_FUNCPTR(png_set_write_fn);
 239         LOAD_FUNCPTR(png_read_end);
 240         LOAD_FUNCPTR(png_read_image);
 241         LOAD_FUNCPTR(png_read_info);
 242         LOAD_FUNCPTR(png_write_end);
 243         LOAD_FUNCPTR(png_write_info);
 244         LOAD_FUNCPTR(png_write_rows);
 245
 246 #undef LOAD_FUNCPTR
 247     }
 248     return libpng_handle;
 249 }
 250
 251 static void user_error_fn(png_structp png_ptr, png_const_charp error_message)
 252 {
 253     jmp_buf *pjmpbuf;
 254
 255     /* This uses setjmp/longjmp just like the default. We can't use the
 256      * default because there's no way to access the jmp buffer in the png_struct
 257      * that works in 1.2 and 1.4 and allows us to dynamically load libpng. */
 258     WARN("PNG error: %s\n", debugstr_a(error_message));
 259     pjmpbuf = ppng_get_error_ptr(png_ptr);
 260     longjmp(*pjmpbuf, 1);
 261 }
 262
 263 static void user_warning_fn(png_structp png_ptr, png_const_charp warning_message)
 264 {
 265     WARN("PNG warning: %s\n", debugstr_a(warning_message));
 266 }
 267
 268 typedef struct {
 269     IWICBitmapDecoder IWICBitmapDecoder_iface;
 270     IWICBitmapFrameDecode IWICBitmapFrameDecode_iface;
 271     IWICMetadataBlockReader IWICMetadataBlockReader_iface;
 272     LONG ref;
 273     png_structp png_ptr;
 274     png_infop info_ptr;
 275     png_infop end_info;
 276     BOOL initialized;
 277     int bpp;
 278     int width, height;
 279     UINT stride;
 280     const WICPixelFormatGUID *format;
 281     BYTE *image_bits;
 282     CRITICAL_SECTION lock; /* must be held when png structures are accessed or initialized is set */
 283 } PngDecoder;
 284
 285 static inline PngDecoder *impl_from_IWICBitmapDecoder(IWICBitmapDecoder *iface)
 286 {
 287     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapDecoder_iface);
 288 }
 289
 290 static inline PngDecoder *impl_from_IWICBitmapFrameDecode(IWICBitmapFrameDecode *iface)
 291 {
 292     return CONTAINING_RECORD(iface, PngDecoder, IWICBitmapFrameDecode_iface);
 293 }
 294
 295 static inline PngDecoder *impl_from_IWICMetadataBlockReader(IWICMetadataBlockReader *iface)
 296 {
 297     return CONTAINING_RECORD(iface, PngDecoder, IWICMetadataBlockReader_iface);
 298 }
 299
 300 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl;
 301
 302 static HRESULT WINAPI PngDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
 303     void **ppv)
 304 {
 305     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 306     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 307
 308     if (!ppv) return E_INVALIDARG;
 309
 310     if (IsEqualIID(&IID_IUnknown, iid) || IsEqualIID(&IID_IWICBitmapDecoder, iid))
 311     {
 312         *ppv = &This->IWICBitmapDecoder_iface;
 313     }
 314     else
 315     {
 316         *ppv = NULL;
 317         return E_NOINTERFACE;
 318     }
 319
 320     IUnknown_AddRef((IUnknown*)*ppv);
 321     return S_OK;
 322 }
 323
 324 static ULONG WINAPI PngDecoder_AddRef(IWICBitmapDecoder *iface)
 325 {
 326     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 327     ULONG ref = InterlockedIncrement(&This->ref);
 328
 329     TRACE("(%p) refcount=%u\n", iface, ref);
 330
 331     return ref;
 332 }
 333
 334 static ULONG WINAPI PngDecoder_Release(IWICBitmapDecoder *iface)
 335 {
 336     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 337     ULONG ref = InterlockedDecrement(&This->ref);
 338
 339     TRACE("(%p) refcount=%u\n", iface, ref);
 340
 341     if (ref == 0)
 342     {
 343         if (This->png_ptr)
 344             ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 345         This->lock.DebugInfo->Spare[0] = 0;
 346         DeleteCriticalSection(&This->lock);
 347         HeapFree(GetProcessHeap(), 0, This->image_bits);
 348         HeapFree(GetProcessHeap(), 0, This);
 349     }
 350
 351     return ref;
 352 }
 353
 354 static HRESULT WINAPI PngDecoder_QueryCapability(IWICBitmapDecoder *iface, IStream *pIStream,
 355     DWORD *pdwCapability)
 356 {
 357     FIXME("(%p,%p,%p): stub\n", iface, pIStream, pdwCapability);
 358     return E_NOTIMPL;
 359 }
 360
 361 static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 362 {
 363     IStream *stream = ppng_get_io_ptr(png_ptr);
 364     HRESULT hr;
 365     ULONG bytesread;
 366
 367     hr = IStream_Read(stream, data, length, &bytesread);
 368     if (FAILED(hr) || bytesread != length)
 369     {
 370         ppng_error(png_ptr, "failed reading data");
 371     }
 372 }
 373
 374 static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
 375     WICDecodeOptions cacheOptions)
 376 {
 377     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 378     LARGE_INTEGER seek;
 379     HRESULT hr=S_OK;
 380     png_bytep *row_pointers=NULL;
 381     UINT image_size;
 382     UINT i;
 383     int color_type, bit_depth;
 384     png_bytep trans;
 385     int num_trans;
 386     png_uint_32 transparency;
 387     png_color_16p trans_values;
 388     jmp_buf jmpbuf;
 389
 390     TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
 391
 392     EnterCriticalSection(&This->lock);
 393
 394     /* initialize libpng */
 395     This->png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 396     if (!This->png_ptr)
 397     {
 398         hr = E_FAIL;
 399         goto end;
 400     }
 401
 402     This->info_ptr = ppng_create_info_struct(This->png_ptr);
 403     if (!This->info_ptr)
 404     {
 405         ppng_destroy_read_struct(&This->png_ptr, NULL, NULL);
 406         This->png_ptr = NULL;
 407         hr = E_FAIL;
 408         goto end;
 409     }
 410
 411     This->end_info = ppng_create_info_struct(This->png_ptr);
 412     if (!This->info_ptr)
 413     {
 414         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, NULL);
 415         This->png_ptr = NULL;
 416         hr = E_FAIL;
 417         goto end;
 418     }
 419
 420     /* set up setjmp/longjmp error handling */
 421     if (setjmp(jmpbuf))
 422     {
 423         ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
 424         HeapFree(GetProcessHeap(), 0, row_pointers);
 425         This->png_ptr = NULL;
 426         hr = E_FAIL;
 427         goto end;
 428     }
 429     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
 430
 431     /* seek to the start of the stream */
 432     seek.QuadPart = 0;
 433     hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
 434     if (FAILED(hr)) goto end;
 435
 436     /* set up custom i/o handling */
 437     ppng_set_read_fn(This->png_ptr, pIStream, user_read_data);
 438
 439     /* read the header */
 440     ppng_read_info(This->png_ptr, This->info_ptr);
 441
 442     /* choose a pixel format */
 443     color_type = ppng_get_color_type(This->png_ptr, This->info_ptr);
 444     bit_depth = ppng_get_bit_depth(This->png_ptr, This->info_ptr);
 445
 446     /* check for color-keyed alpha */
 447     transparency = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 448
 449     if (transparency && color_type != PNG_COLOR_TYPE_PALETTE)
 450     {
 451         /* expand to RGBA */
 452         if (color_type == PNG_COLOR_TYPE_GRAY)
 453         {
 454             if (bit_depth < 8)
 455             {
 456 #if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
 457                 ppng_set_expand_gray_1_2_4_to_8(This->png_ptr);
 458 #else
 459                 ppng_set_gray_1_2_4_to_8(This->png_ptr);
 460 #endif
 461                 bit_depth = 8;
 462             }
 463             ppng_set_gray_to_rgb(This->png_ptr);
 464         }
 465         ppng_set_tRNS_to_alpha(This->png_ptr);
 466         color_type = PNG_COLOR_TYPE_RGB_ALPHA;
 467     }
 468
 469     switch (color_type)
 470     {
 471     case PNG_COLOR_TYPE_GRAY:
 472         This->bpp = bit_depth;
 473         switch (bit_depth)
 474         {
 475         case 1: This->format = &GUID_WICPixelFormatBlackWhite; break;
 476         case 2: This->format = &GUID_WICPixelFormat2bppGray; break;
 477         case 4: This->format = &GUID_WICPixelFormat4bppGray; break;
 478         case 8: This->format = &GUID_WICPixelFormat8bppGray; break;
 479         case 16: This->format = &GUID_WICPixelFormat16bppGray; break;
 480         default:
 481             ERR("invalid grayscale bit depth: %i\n", bit_depth);
 482             hr = E_FAIL;
 483             goto end;
 484         }
 485         break;
 486     case PNG_COLOR_TYPE_GRAY_ALPHA:
 487         /* WIC does not support grayscale alpha formats so use RGBA */
 488         ppng_set_gray_to_rgb(This->png_ptr);
 489         /* fall through */
 490     case PNG_COLOR_TYPE_RGB_ALPHA:
 491         This->bpp = bit_depth * 4;
 492         switch (bit_depth)
 493         {
 494         case 8:
 495             ppng_set_bgr(This->png_ptr);
 496             This->format = &GUID_WICPixelFormat32bppBGRA;
 497             break;
 498         case 16: This->format = &GUID_WICPixelFormat64bppRGBA; break;
 499         default:
 500             ERR("invalid RGBA bit depth: %i\n", bit_depth);
 501             hr = E_FAIL;
 502             goto end;
 503         }
 504         break;
 505     case PNG_COLOR_TYPE_PALETTE:
 506         This->bpp = bit_depth;
 507         switch (bit_depth)
 508         {
 509         case 1: This->format = &GUID_WICPixelFormat1bppIndexed; break;
 510         case 2: This->format = &GUID_WICPixelFormat2bppIndexed; break;
 511         case 4: This->format = &GUID_WICPixelFormat4bppIndexed; break;
 512         case 8: This->format = &GUID_WICPixelFormat8bppIndexed; break;
 513         default:
 514             ERR("invalid indexed color bit depth: %i\n", bit_depth);
 515             hr = E_FAIL;
 516             goto end;
 517         }
 518         break;
 519     case PNG_COLOR_TYPE_RGB:
 520         This->bpp = bit_depth * 3;
 521         switch (bit_depth)
 522         {
 523         case 8:
 524             ppng_set_bgr(This->png_ptr);
 525             This->format = &GUID_WICPixelFormat24bppBGR;
 526             break;
 527         case 16: This->format = &GUID_WICPixelFormat48bppRGB; break;
 528         default:
 529             ERR("invalid RGB color bit depth: %i\n", bit_depth);
 530             hr = E_FAIL;
 531             goto end;
 532         }
 533         break;
 534     default:
 535         ERR("invalid color type %i\n", color_type);
 536         hr = E_FAIL;
 537         goto end;
 538     }
 539
 540     /* read the image data */
 541     This->width = ppng_get_image_width(This->png_ptr, This->info_ptr);
 542     This->height = ppng_get_image_height(This->png_ptr, This->info_ptr);
 543     This->stride = This->width * This->bpp;
 544     image_size = This->stride * This->height;
 545
 546     This->image_bits = HeapAlloc(GetProcessHeap(), 0, image_size);
 547     if (!This->image_bits)
 548     {
 549         hr = E_OUTOFMEMORY;
 550         goto end;
 551     }
 552
 553     row_pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(png_bytep)*This->height);
 554     if (!row_pointers)
 555     {
 556         hr = E_OUTOFMEMORY;
 557         goto end;
 558     }
 559
 560     for (i=0; i<This->height; i++)
 561         row_pointers[i] = This->image_bits + i * This->stride;
 562
 563     ppng_read_image(This->png_ptr, row_pointers);
 564
 565     HeapFree(GetProcessHeap(), 0, row_pointers);
 566     row_pointers = NULL;
 567
 568     ppng_read_end(This->png_ptr, This->end_info);
 569
 570     This->initialized = TRUE;
 571
 572 end:
 573
 574     LeaveCriticalSection(&This->lock);
 575
 576     return hr;
 577 }
 578
 579 static HRESULT WINAPI PngDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
 580     GUID *pguidContainerFormat)
 581 {
 582     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 583     return S_OK;
 584 }
 585
 586 static HRESULT WINAPI PngDecoder_GetDecoderInfo(IWICBitmapDecoder *iface,
 587     IWICBitmapDecoderInfo **ppIDecoderInfo)
 588 {
 589     HRESULT hr;
 590     IWICComponentInfo *compinfo;
 591
 592     TRACE("(%p,%p)\n", iface, ppIDecoderInfo);
 593
 594     hr = CreateComponentInfo(&CLSID_WICPngDecoder, &compinfo);
 595     if (FAILED(hr)) return hr;
 596
 597     hr = IWICComponentInfo_QueryInterface(compinfo, &IID_IWICBitmapDecoderInfo,
 598         (void**)ppIDecoderInfo);
 599
 600     IWICComponentInfo_Release(compinfo);
 601
 602     return hr;
 603 }
 604
 605 static HRESULT WINAPI PngDecoder_CopyPalette(IWICBitmapDecoder *iface,
 606     IWICPalette *pIPalette)
 607 {
 608     FIXME("(%p,%p): stub\n", iface, pIPalette);
 609     return E_NOTIMPL;
 610 }
 611
 612 static HRESULT WINAPI PngDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,
 613     IWICMetadataQueryReader **ppIMetadataQueryReader)
 614 {
 615     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 616     return E_NOTIMPL;
 617 }
 618
 619 static HRESULT WINAPI PngDecoder_GetPreview(IWICBitmapDecoder *iface,
 620     IWICBitmapSource **ppIBitmapSource)
 621 {
 622     FIXME("(%p,%p): stub\n", iface, ppIBitmapSource);
 623     return E_NOTIMPL;
 624 }
 625
 626 static HRESULT WINAPI PngDecoder_GetColorContexts(IWICBitmapDecoder *iface,
 627     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 628 {
 629     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 630     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 631 }
 632
 633 static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 634     IWICBitmapSource **ppIThumbnail)
 635 {
 636     TRACE("(%p,%p)\n", iface, ppIThumbnail);
 637     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 638 }
 639
 640 static HRESULT WINAPI PngDecoder_GetFrameCount(IWICBitmapDecoder *iface,
 641     UINT *pCount)
 642 {
 643     *pCount = 1;
 644     return S_OK;
 645 }
 646
 647 static HRESULT WINAPI PngDecoder_GetFrame(IWICBitmapDecoder *iface,
 648     UINT index, IWICBitmapFrameDecode **ppIBitmapFrame)
 649 {
 650     PngDecoder *This = impl_from_IWICBitmapDecoder(iface);
 651     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 652
 653     if (!This->initialized) return WINCODEC_ERR_NOTINITIALIZED;
 654
 655     if (index != 0) return E_INVALIDARG;
 656
 657     IWICBitmapDecoder_AddRef(iface);
 658
 659     *ppIBitmapFrame = &This->IWICBitmapFrameDecode_iface;
 660
 661     return S_OK;
 662 }
 663
 664 static const IWICBitmapDecoderVtbl PngDecoder_Vtbl = {
 665     PngDecoder_QueryInterface,
 666     PngDecoder_AddRef,
 667     PngDecoder_Release,
 668     PngDecoder_QueryCapability,
 669     PngDecoder_Initialize,
 670     PngDecoder_GetContainerFormat,
 671     PngDecoder_GetDecoderInfo,
 672     PngDecoder_CopyPalette,
 673     PngDecoder_GetMetadataQueryReader,
 674     PngDecoder_GetPreview,
 675     PngDecoder_GetColorContexts,
 676     PngDecoder_GetThumbnail,
 677     PngDecoder_GetFrameCount,
 678     PngDecoder_GetFrame
 679 };
 680
 681 static HRESULT WINAPI PngDecoder_Frame_QueryInterface(IWICBitmapFrameDecode *iface, REFIID iid,
 682     void **ppv)
 683 {
 684     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 685     if (!ppv) return E_INVALIDARG;
 686
 687     if (IsEqualIID(&IID_IUnknown, iid) ||
 688         IsEqualIID(&IID_IWICBitmapSource, iid) ||
 689         IsEqualIID(&IID_IWICBitmapFrameDecode, iid))
 690     {
 691         *ppv = &This->IWICBitmapFrameDecode_iface;
 692     }
 693     else if (IsEqualIID(&IID_IWICMetadataBlockReader, iid))
 694     {
 695         *ppv = &This->IWICMetadataBlockReader_iface;
 696     }
 697     else
 698     {
 699         *ppv = NULL;
 700         return E_NOINTERFACE;
 701     }
 702
 703     IUnknown_AddRef((IUnknown*)*ppv);
 704     return S_OK;
 705 }
 706
 707 static ULONG WINAPI PngDecoder_Frame_AddRef(IWICBitmapFrameDecode *iface)
 708 {
 709     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 710     return IWICBitmapDecoder_AddRef(&This->IWICBitmapDecoder_iface);
 711 }
 712
 713 static ULONG WINAPI PngDecoder_Frame_Release(IWICBitmapFrameDecode *iface)
 714 {
 715     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 716     return IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 717 }
 718
 719 static HRESULT WINAPI PngDecoder_Frame_GetSize(IWICBitmapFrameDecode *iface,
 720     UINT *puiWidth, UINT *puiHeight)
 721 {
 722     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 723     *puiWidth = This->width;
 724     *puiHeight = This->height;
 725     TRACE("(%p)->(%u,%u)\n", iface, *puiWidth, *puiHeight);
 726     return S_OK;
 727 }
 728
 729 static HRESULT WINAPI PngDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *iface,
 730     WICPixelFormatGUID *pPixelFormat)
 731 {
 732     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 733     TRACE("(%p,%p)\n", iface, pPixelFormat);
 734
 735     memcpy(pPixelFormat, This->format, sizeof(GUID));
 736
 737     return S_OK;
 738 }
 739
 740 static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
 741     double *pDpiX, double *pDpiY)
 742 {
 743     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 744     png_uint_32 ret, xres, yres;
 745     int unit_type;
 746
 747     EnterCriticalSection(&This->lock);
 748
 749     ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
 750
 751     if (ret && unit_type == PNG_RESOLUTION_METER)
 752     {
 753         *pDpiX = xres * 0.0254;
 754         *pDpiY = yres * 0.0254;
 755     }
 756     else
 757     {
 758         WARN("no pHYs block present\n");
 759         *pDpiX = *pDpiY = 96.0;
 760     }
 761
 762     LeaveCriticalSection(&This->lock);
 763
 764     TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
 765
 766     return S_OK;
 767 }
 768
 769 static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
 770     IWICPalette *pIPalette)
 771 {
 772     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 773     png_uint_32 ret;
 774     png_colorp png_palette;
 775     int num_palette;
 776     WICColor palette[256];
 777     png_bytep trans;
 778     int num_trans;
 779     png_color_16p trans_values;
 780     int i;
 781     HRESULT hr=S_OK;
 782
 783     TRACE("(%p,%p)\n", iface, pIPalette);
 784
 785     EnterCriticalSection(&This->lock);
 786
 787     ret = ppng_get_PLTE(This->png_ptr, This->info_ptr, &png_palette, &num_palette);
 788     if (!ret)
 789     {
 790         hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
 791         goto end;
 792     }
 793
 794     if (num_palette > 256)
 795     {
 796         ERR("palette has %i colors?!\n", num_palette);
 797         hr = E_FAIL;
 798         goto end;
 799     }
 800
 801     for (i=0; i<num_palette; i++)
 802     {
 803         palette[i] = (0xff000000|
 804                       png_palette[i].red << 16|
 805                       png_palette[i].green << 8|
 806                       png_palette[i].blue);
 807     }
 808
 809     ret = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
 810     if (ret)
 811     {
 812         for (i=0; i<num_trans; i++)
 813         {
 814             palette[trans[i]] = 0x00000000;
 815         }
 816     }
 817
 818 end:
 819
 820     LeaveCriticalSection(&This->lock);
 821
 822     if (SUCCEEDED(hr))
 823         hr = IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
 824
 825     return hr;
 826 }
 827
 828 static HRESULT WINAPI PngDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
 829     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 830 {
 831     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 832     TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
 833
 834     return copy_pixels(This->bpp, This->image_bits,
 835         This->width, This->height, This->stride,
 836         prc, cbStride, cbBufferSize, pbBuffer);
 837 }
 838
 839 static HRESULT WINAPI PngDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
 840     IWICMetadataQueryReader **ppIMetadataQueryReader)
 841 {
 842     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryReader);
 843     return E_NOTIMPL;
 844 }
 845
 846 static HRESULT WINAPI PngDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *iface,
 847     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 848 {
 849     PngDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
 850     png_charp name, profile;
 851     png_uint_32 len;
 852     int compression_type;
 853     HRESULT hr;
 854
 855     TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
 856
 857     EnterCriticalSection(&This->lock);
 858
 859     if (ppng_get_iCCP(This->png_ptr, This->info_ptr, &name, &compression_type, &profile, &len))
 860     {
 861         if (cCount && ppIColorContexts)
 862         {
 863             hr = IWICColorContext_InitializeFromMemory(*ppIColorContexts, (const BYTE *)profile, len);
 864             if (FAILED(hr))
 865             {
 866                 LeaveCriticalSection(&This->lock);
 867                 return hr;
 868             }
 869         }
 870         *pcActualCount = 1;
 871     }
 872     else
 873         *pcActualCount = 0;
 874
 875     LeaveCriticalSection(&This->lock);
 876
 877     return S_OK;
 878 }
 879
 880 static HRESULT WINAPI PngDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
 881     IWICBitmapSource **ppIThumbnail)
 882 {
 883     FIXME("(%p,%p): stub\n", iface, ppIThumbnail);
 884     return E_NOTIMPL;
 885 }
 886
 887 static const IWICBitmapFrameDecodeVtbl PngDecoder_FrameVtbl = {
 888     PngDecoder_Frame_QueryInterface,
 889     PngDecoder_Frame_AddRef,
 890     PngDecoder_Frame_Release,
 891     PngDecoder_Frame_GetSize,
 892     PngDecoder_Frame_GetPixelFormat,
 893     PngDecoder_Frame_GetResolution,
 894     PngDecoder_Frame_CopyPalette,
 895     PngDecoder_Frame_CopyPixels,
 896     PngDecoder_Frame_GetMetadataQueryReader,
 897     PngDecoder_Frame_GetColorContexts,
 898     PngDecoder_Frame_GetThumbnail
 899 };
 900
 901 static HRESULT WINAPI PngDecoder_Block_QueryInterface(IWICMetadataBlockReader *iface, REFIID iid,
 902     void **ppv)
 903 {
 904     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 905     return IWICBitmapFrameDecode_QueryInterface(&This->IWICBitmapFrameDecode_iface, iid, ppv);
 906 }
 907
 908 static ULONG WINAPI PngDecoder_Block_AddRef(IWICMetadataBlockReader *iface)
 909 {
 910     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 911     return IWICBitmapDecoder_AddRef(&This->IWICBitmapDecoder_iface);
 912 }
 913
 914 static ULONG WINAPI PngDecoder_Block_Release(IWICMetadataBlockReader *iface)
 915 {
 916     PngDecoder *This = impl_from_IWICMetadataBlockReader(iface);
 917     return IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 918 }
 919
 920 static HRESULT WINAPI PngDecoder_Block_GetContainerFormat(IWICMetadataBlockReader *iface,
 921     GUID *pguidContainerFormat)
 922 {
 923     if (!pguidContainerFormat) return E_INVALIDARG;
 924     memcpy(pguidContainerFormat, &GUID_ContainerFormatPng, sizeof(GUID));
 925     return S_OK;
 926 }
 927
 928 static HRESULT WINAPI PngDecoder_Block_GetCount(IWICMetadataBlockReader *iface,
 929     UINT *pcCount)
 930 {
 931     FIXME("%p,%p: stub\n", iface, pcCount);
 932     return E_NOTIMPL;
 933 }
 934
 935 static HRESULT WINAPI PngDecoder_Block_GetReaderByIndex(IWICMetadataBlockReader *iface,
 936     UINT nIndex, IWICMetadataReader **ppIMetadataReader)
 937 {
 938     FIXME("%p,%d,%p\n", iface, nIndex, ppIMetadataReader);
 939     return E_NOTIMPL;
 940 }
 941
 942 static HRESULT WINAPI PngDecoder_Block_GetEnumerator(IWICMetadataBlockReader *iface,
 943     IEnumUnknown **ppIEnumMetadata)
 944 {
 945     FIXME("%p,%p\n", iface, ppIEnumMetadata);
 946     return E_NOTIMPL;
 947 }
 948
 949 static const IWICMetadataBlockReaderVtbl PngDecoder_BlockVtbl = {
 950     PngDecoder_Block_QueryInterface,
 951     PngDecoder_Block_AddRef,
 952     PngDecoder_Block_Release,
 953     PngDecoder_Block_GetContainerFormat,
 954     PngDecoder_Block_GetCount,
 955     PngDecoder_Block_GetReaderByIndex,
 956     PngDecoder_Block_GetEnumerator,
 957 };
 958
 959 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 960 {
 961     PngDecoder *This;
 962     HRESULT ret;
 963
 964     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
 965
 966     *ppv = NULL;
 967
 968     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 969
 970     if (!libpng_handle && !load_libpng())
 971     {
 972         ERR("Failed reading PNG because unable to find %s\n",SONAME_LIBPNG);
 973         return E_FAIL;
 974     }
 975
 976     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngDecoder));
 977     if (!This) return E_OUTOFMEMORY;
 978
 979     This->IWICBitmapDecoder_iface.lpVtbl = &PngDecoder_Vtbl;
 980     This->IWICBitmapFrameDecode_iface.lpVtbl = &PngDecoder_FrameVtbl;
 981     This->IWICMetadataBlockReader_iface.lpVtbl = &PngDecoder_BlockVtbl;
 982     This->ref = 1;
 983     This->png_ptr = NULL;
 984     This->info_ptr = NULL;
 985     This->end_info = NULL;
 986     This->initialized = FALSE;
 987     This->image_bits = NULL;
 988     InitializeCriticalSection(&This->lock);
 989     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngDecoder.lock");
 990
 991     ret = IWICBitmapDecoder_QueryInterface(&This->IWICBitmapDecoder_iface, iid, ppv);
 992     IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);
 993
 994     return ret;
 995 }
 996
 997 struct png_pixelformat {
 998     const WICPixelFormatGUID *guid;
 999     UINT bpp;
1000     int bit_depth;
1001     int color_type;
1002     BOOL remove_filler;
1003     BOOL swap_rgb;
1004 };
1005
1006 static const struct png_pixelformat formats[] = {
1007     {&GUID_WICPixelFormat24bppBGR, 24, 8, PNG_COLOR_TYPE_RGB, 0, 1},
1008     {&GUID_WICPixelFormatBlackWhite, 1, 1, PNG_COLOR_TYPE_GRAY, 0, 0},
1009     {&GUID_WICPixelFormat2bppGray, 2, 2, PNG_COLOR_TYPE_GRAY, 0, 0},
1010     {&GUID_WICPixelFormat4bppGray, 4, 4, PNG_COLOR_TYPE_GRAY, 0, 0},
1011     {&GUID_WICPixelFormat8bppGray, 8, 8, PNG_COLOR_TYPE_GRAY, 0, 0},
1012     {&GUID_WICPixelFormat16bppGray, 16, 16, PNG_COLOR_TYPE_GRAY, 0, 0},
1013     {&GUID_WICPixelFormat32bppBGR, 32, 8, PNG_COLOR_TYPE_RGB, 1, 1},
1014     {&GUID_WICPixelFormat32bppBGRA, 32, 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 1},
1015     {&GUID_WICPixelFormat48bppRGB, 48, 16, PNG_COLOR_TYPE_RGB, 0, 0},
1016     {&GUID_WICPixelFormat64bppRGBA, 64, 16, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0},
1017     {NULL},
1018 };
1019
1020 typedef struct PngEncoder {
1021     IWICBitmapEncoder IWICBitmapEncoder_iface;
1022     IWICBitmapFrameEncode IWICBitmapFrameEncode_iface;
1023     LONG ref;
1024     IStream *stream;
1025     png_structp png_ptr;
1026     png_infop info_ptr;
1027     UINT frame_count;
1028     BOOL frame_initialized;
1029     const struct png_pixelformat *format;
1030     BOOL info_written;
1031     UINT width, height;
1032     double xres, yres;
1033     UINT lines_written;
1034     BOOL frame_committed;
1035     BOOL committed;
1036     CRITICAL_SECTION lock;
1037 } PngEncoder;
1038
1039 static inline PngEncoder *impl_from_IWICBitmapEncoder(IWICBitmapEncoder *iface)
1040 {
1041     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapEncoder_iface);
1042 }
1043
1044 static inline PngEncoder *impl_from_IWICBitmapFrameEncode(IWICBitmapFrameEncode *iface)
1045 {
1046     return CONTAINING_RECORD(iface, PngEncoder, IWICBitmapFrameEncode_iface);
1047 }
1048
1049 static HRESULT WINAPI PngFrameEncode_QueryInterface(IWICBitmapFrameEncode *iface, REFIID iid,
1050     void **ppv)
1051 {
1052     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1053     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1054
1055     if (!ppv) return E_INVALIDARG;
1056
1057     if (IsEqualIID(&IID_IUnknown, iid) ||
1058         IsEqualIID(&IID_IWICBitmapFrameEncode, iid))
1059     {
1060         *ppv = &This->IWICBitmapFrameEncode_iface;
1061     }
1062     else
1063     {
1064         *ppv = NULL;
1065         return E_NOINTERFACE;
1066     }
1067
1068     IUnknown_AddRef((IUnknown*)*ppv);
1069     return S_OK;
1070 }
1071
1072 static ULONG WINAPI PngFrameEncode_AddRef(IWICBitmapFrameEncode *iface)
1073 {
1074     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1075     return IWICBitmapEncoder_AddRef(&This->IWICBitmapEncoder_iface);
1076 }
1077
1078 static ULONG WINAPI PngFrameEncode_Release(IWICBitmapFrameEncode *iface)
1079 {
1080     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1081     return IWICBitmapEncoder_Release(&This->IWICBitmapEncoder_iface);
1082 }
1083
1084 static HRESULT WINAPI PngFrameEncode_Initialize(IWICBitmapFrameEncode *iface,
1085     IPropertyBag2 *pIEncoderOptions)
1086 {
1087     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1088     TRACE("(%p,%p)\n", iface, pIEncoderOptions);
1089
1090     EnterCriticalSection(&This->lock);
1091
1092     if (This->frame_initialized)
1093     {
1094         LeaveCriticalSection(&This->lock);
1095         return WINCODEC_ERR_WRONGSTATE;
1096     }
1097
1098     This->frame_initialized = TRUE;
1099
1100     LeaveCriticalSection(&This->lock);
1101
1102     return S_OK;
1103 }
1104
1105 static HRESULT WINAPI PngFrameEncode_SetSize(IWICBitmapFrameEncode *iface,
1106     UINT uiWidth, UINT uiHeight)
1107 {
1108     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1109     TRACE("(%p,%u,%u)\n", iface, uiWidth, uiHeight);
1110
1111     EnterCriticalSection(&This->lock);
1112
1113     if (!This->frame_initialized || This->info_written)
1114     {
1115         LeaveCriticalSection(&This->lock);
1116         return WINCODEC_ERR_WRONGSTATE;
1117     }
1118
1119     This->width = uiWidth;
1120     This->height = uiHeight;
1121
1122     LeaveCriticalSection(&This->lock);
1123
1124     return S_OK;
1125 }
1126
1127 static HRESULT WINAPI PngFrameEncode_SetResolution(IWICBitmapFrameEncode *iface,
1128     double dpiX, double dpiY)
1129 {
1130     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1131     TRACE("(%p,%0.2f,%0.2f)\n", iface, dpiX, dpiY);
1132
1133     EnterCriticalSection(&This->lock);
1134
1135     if (!This->frame_initialized || This->info_written)
1136     {
1137         LeaveCriticalSection(&This->lock);
1138         return WINCODEC_ERR_WRONGSTATE;
1139     }
1140
1141     This->xres = dpiX;
1142     This->yres = dpiY;
1143
1144     LeaveCriticalSection(&This->lock);
1145
1146     return S_OK;
1147 }
1148
1149 static HRESULT WINAPI PngFrameEncode_SetPixelFormat(IWICBitmapFrameEncode *iface,
1150     WICPixelFormatGUID *pPixelFormat)
1151 {
1152     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1153     int i;
1154     TRACE("(%p,%s)\n", iface, debugstr_guid(pPixelFormat));
1155
1156     EnterCriticalSection(&This->lock);
1157
1158     if (!This->frame_initialized || This->info_written)
1159     {
1160         LeaveCriticalSection(&This->lock);
1161         return WINCODEC_ERR_WRONGSTATE;
1162     }
1163
1164     for (i=0; formats[i].guid; i++)
1165     {
1166         if (memcmp(formats[i].guid, pPixelFormat, sizeof(GUID)) == 0)
1167             break;
1168     }
1169
1170     if (!formats[i].guid) i = 0;
1171
1172     This->format = &formats[i];
1173     memcpy(pPixelFormat, This->format->guid, sizeof(GUID));
1174
1175     LeaveCriticalSection(&This->lock);
1176
1177     return S_OK;
1178 }
1179
1180 static HRESULT WINAPI PngFrameEncode_SetColorContexts(IWICBitmapFrameEncode *iface,
1181     UINT cCount, IWICColorContext **ppIColorContext)
1182 {
1183     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1184     return E_NOTIMPL;
1185 }
1186
1187 static HRESULT WINAPI PngFrameEncode_SetPalette(IWICBitmapFrameEncode *iface,
1188     IWICPalette *pIPalette)
1189 {
1190     FIXME("(%p,%p): stub\n", iface, pIPalette);
1191     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1192 }
1193
1194 static HRESULT WINAPI PngFrameEncode_SetThumbnail(IWICBitmapFrameEncode *iface,
1195     IWICBitmapSource *pIThumbnail)
1196 {
1197     FIXME("(%p,%p): stub\n", iface, pIThumbnail);
1198     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1199 }
1200
1201 static HRESULT WINAPI PngFrameEncode_WritePixels(IWICBitmapFrameEncode *iface,
1202     UINT lineCount, UINT cbStride, UINT cbBufferSize, BYTE *pbPixels)
1203 {
1204     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1205     png_byte **row_pointers=NULL;
1206     UINT i;
1207     jmp_buf jmpbuf;
1208     TRACE("(%p,%u,%u,%u,%p)\n", iface, lineCount, cbStride, cbBufferSize, pbPixels);
1209
1210     EnterCriticalSection(&This->lock);
1211
1212     if (!This->frame_initialized || !This->width || !This->height || !This->format)
1213     {
1214         LeaveCriticalSection(&This->lock);
1215         return WINCODEC_ERR_WRONGSTATE;
1216     }
1217
1218     if (lineCount == 0 || lineCount + This->lines_written > This->height)
1219     {
1220         LeaveCriticalSection(&This->lock);
1221         return E_INVALIDARG;
1222     }
1223
1224     /* set up setjmp/longjmp error handling */
1225     if (setjmp(jmpbuf))
1226     {
1227         LeaveCriticalSection(&This->lock);
1228         HeapFree(GetProcessHeap(), 0, row_pointers);
1229         return E_FAIL;
1230     }
1231     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1232
1233     if (!This->info_written)
1234     {
1235         ppng_set_IHDR(This->png_ptr, This->info_ptr, This->width, This->height,
1236             This->format->bit_depth, This->format->color_type, PNG_INTERLACE_NONE,
1237             PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1238
1239         if (This->xres != 0.0 && This->yres != 0.0)
1240         {
1241             ppng_set_pHYs(This->png_ptr, This->info_ptr, (This->xres+0.0127) / 0.0254,
1242                 (This->yres+0.0127) / 0.0254, PNG_RESOLUTION_METER);
1243         }
1244
1245         ppng_write_info(This->png_ptr, This->info_ptr);
1246
1247         if (This->format->remove_filler)
1248             ppng_set_filler(This->png_ptr, 0, PNG_FILLER_AFTER);
1249
1250         if (This->format->swap_rgb)
1251             ppng_set_bgr(This->png_ptr);
1252
1253         This->info_written = TRUE;
1254     }
1255
1256     row_pointers = HeapAlloc(GetProcessHeap(), 0, lineCount * sizeof(png_byte*));
1257     if (!row_pointers)
1258     {
1259         LeaveCriticalSection(&This->lock);
1260         return E_OUTOFMEMORY;
1261     }
1262
1263     for (i=0; i<lineCount; i++)
1264         row_pointers[i] = pbPixels + cbStride * i;
1265
1266     ppng_write_rows(This->png_ptr, row_pointers, lineCount);
1267     This->lines_written += lineCount;
1268
1269     LeaveCriticalSection(&This->lock);
1270
1271     HeapFree(GetProcessHeap(), 0, row_pointers);
1272
1273     return S_OK;
1274 }
1275
1276 static HRESULT WINAPI PngFrameEncode_WriteSource(IWICBitmapFrameEncode *iface,
1277     IWICBitmapSource *pIBitmapSource, WICRect *prc)
1278 {
1279     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1280     HRESULT hr;
1281     WICRect rc;
1282     WICPixelFormatGUID guid;
1283     UINT stride;
1284     BYTE *pixeldata;
1285     TRACE("(%p,%p,%p)\n", iface, pIBitmapSource, prc);
1286
1287     if (!This->frame_initialized || !This->width || !This->height)
1288         return WINCODEC_ERR_WRONGSTATE;
1289
1290     if (!This->format)
1291     {
1292         hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1293         if (FAILED(hr)) return hr;
1294         hr = IWICBitmapFrameEncode_SetPixelFormat(iface, &guid);
1295         if (FAILED(hr)) return hr;
1296     }
1297
1298     hr = IWICBitmapSource_GetPixelFormat(pIBitmapSource, &guid);
1299     if (FAILED(hr)) return hr;
1300     if (memcmp(&guid, This->format->guid, sizeof(GUID)) != 0)
1301     {
1302         /* FIXME: should use WICConvertBitmapSource to convert */
1303         ERR("format %s unsupported\n", debugstr_guid(&guid));
1304         return E_FAIL;
1305     }
1306
1307     if (This->xres == 0.0 || This->yres == 0.0)
1308     {
1309         double xres, yres;
1310         hr = IWICBitmapSource_GetResolution(pIBitmapSource, &xres, &yres);
1311         if (FAILED(hr)) return hr;
1312         hr = IWICBitmapFrameEncode_SetResolution(iface, xres, yres);
1313         if (FAILED(hr)) return hr;
1314     }
1315
1316     if (!prc)
1317     {
1318         UINT width, height;
1319         hr = IWICBitmapSource_GetSize(pIBitmapSource, &width, &height);
1320         if (FAILED(hr)) return hr;
1321         rc.X = 0;
1322         rc.Y = 0;
1323         rc.Width = width;
1324         rc.Height = height;
1325         prc = &rc;
1326     }
1327
1328     if (prc->Width != This->width) return E_INVALIDARG;
1329
1330     stride = (This->format->bpp * This->width + 7)/8;
1331
1332     pixeldata = HeapAlloc(GetProcessHeap(), 0, stride * prc->Height);
1333     if (!pixeldata) return E_OUTOFMEMORY;
1334
1335     hr = IWICBitmapSource_CopyPixels(pIBitmapSource, prc, stride,
1336         stride*prc->Height, pixeldata);
1337
1338     if (SUCCEEDED(hr))
1339     {
1340         hr = IWICBitmapFrameEncode_WritePixels(iface, prc->Height, stride,
1341             stride*prc->Height, pixeldata);
1342     }
1343
1344     HeapFree(GetProcessHeap(), 0, pixeldata);
1345
1346     return hr;
1347 }
1348
1349 static HRESULT WINAPI PngFrameEncode_Commit(IWICBitmapFrameEncode *iface)
1350 {
1351     PngEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
1352     jmp_buf jmpbuf;
1353     TRACE("(%p)\n", iface);
1354
1355     EnterCriticalSection(&This->lock);
1356
1357     if (!This->info_written || This->lines_written != This->height || This->frame_committed)
1358     {
1359         LeaveCriticalSection(&This->lock);
1360         return WINCODEC_ERR_WRONGSTATE;
1361     }
1362
1363     /* set up setjmp/longjmp error handling */
1364     if (setjmp(jmpbuf))
1365     {
1366         LeaveCriticalSection(&This->lock);
1367         return E_FAIL;
1368     }
1369     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1370
1371     ppng_write_end(This->png_ptr, This->info_ptr);
1372
1373     This->frame_committed = TRUE;
1374
1375     LeaveCriticalSection(&This->lock);
1376
1377     return S_OK;
1378 }
1379
1380 static HRESULT WINAPI PngFrameEncode_GetMetadataQueryWriter(IWICBitmapFrameEncode *iface,
1381     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1382 {
1383     FIXME("(%p, %p): stub\n", iface, ppIMetadataQueryWriter);
1384     return E_NOTIMPL;
1385 }
1386
1387 static const IWICBitmapFrameEncodeVtbl PngEncoder_FrameVtbl = {
1388     PngFrameEncode_QueryInterface,
1389     PngFrameEncode_AddRef,
1390     PngFrameEncode_Release,
1391     PngFrameEncode_Initialize,
1392     PngFrameEncode_SetSize,
1393     PngFrameEncode_SetResolution,
1394     PngFrameEncode_SetPixelFormat,
1395     PngFrameEncode_SetColorContexts,
1396     PngFrameEncode_SetPalette,
1397     PngFrameEncode_SetThumbnail,
1398     PngFrameEncode_WritePixels,
1399     PngFrameEncode_WriteSource,
1400     PngFrameEncode_Commit,
1401     PngFrameEncode_GetMetadataQueryWriter
1402 };
1403
1404 static HRESULT WINAPI PngEncoder_QueryInterface(IWICBitmapEncoder *iface, REFIID iid,
1405     void **ppv)
1406 {
1407     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1408     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
1409
1410     if (!ppv) return E_INVALIDARG;
1411
1412     if (IsEqualIID(&IID_IUnknown, iid) ||
1413         IsEqualIID(&IID_IWICBitmapEncoder, iid))
1414     {
1415         *ppv = &This->IWICBitmapEncoder_iface;
1416     }
1417     else
1418     {
1419         *ppv = NULL;
1420         return E_NOINTERFACE;
1421     }
1422
1423     IUnknown_AddRef((IUnknown*)*ppv);
1424     return S_OK;
1425 }
1426
1427 static ULONG WINAPI PngEncoder_AddRef(IWICBitmapEncoder *iface)
1428 {
1429     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1430     ULONG ref = InterlockedIncrement(&This->ref);
1431
1432     TRACE("(%p) refcount=%u\n", iface, ref);
1433
1434     return ref;
1435 }
1436
1437 static ULONG WINAPI PngEncoder_Release(IWICBitmapEncoder *iface)
1438 {
1439     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1440     ULONG ref = InterlockedDecrement(&This->ref);
1441
1442     TRACE("(%p) refcount=%u\n", iface, ref);
1443
1444     if (ref == 0)
1445     {
1446         This->lock.DebugInfo->Spare[0] = 0;
1447         DeleteCriticalSection(&This->lock);
1448         if (This->png_ptr)
1449             ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1450         if (This->stream)
1451             IStream_Release(This->stream);
1452         HeapFree(GetProcessHeap(), 0, This);
1453     }
1454
1455     return ref;
1456 }
1457
1458 static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
1459 {
1460     PngEncoder *This = ppng_get_io_ptr(png_ptr);
1461     HRESULT hr;
1462     ULONG byteswritten;
1463
1464     hr = IStream_Write(This->stream, data, length, &byteswritten);
1465     if (FAILED(hr) || byteswritten != length)
1466     {
1467         ppng_error(png_ptr, "failed writing data");
1468     }
1469 }
1470
1471 static void user_flush(png_structp png_ptr)
1472 {
1473 }
1474
1475 static HRESULT WINAPI PngEncoder_Initialize(IWICBitmapEncoder *iface,
1476     IStream *pIStream, WICBitmapEncoderCacheOption cacheOption)
1477 {
1478     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1479     jmp_buf jmpbuf;
1480
1481     TRACE("(%p,%p,%u)\n", iface, pIStream, cacheOption);
1482
1483     EnterCriticalSection(&This->lock);
1484
1485     if (This->png_ptr)
1486     {
1487         LeaveCriticalSection(&This->lock);
1488         return WINCODEC_ERR_WRONGSTATE;
1489     }
1490
1491     /* initialize libpng */
1492     This->png_ptr = ppng_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
1493     if (!This->png_ptr)
1494     {
1495         LeaveCriticalSection(&This->lock);
1496         return E_FAIL;
1497     }
1498
1499     This->info_ptr = ppng_create_info_struct(This->png_ptr);
1500     if (!This->info_ptr)
1501     {
1502         ppng_destroy_write_struct(&This->png_ptr, NULL);
1503         This->png_ptr = NULL;
1504         LeaveCriticalSection(&This->lock);
1505         return E_FAIL;
1506     }
1507
1508     IStream_AddRef(pIStream);
1509     This->stream = pIStream;
1510
1511     /* set up setjmp/longjmp error handling */
1512     if (setjmp(jmpbuf))
1513     {
1514         ppng_destroy_write_struct(&This->png_ptr, &This->info_ptr);
1515         This->png_ptr = NULL;
1516         IStream_Release(This->stream);
1517         This->stream = NULL;
1518         LeaveCriticalSection(&This->lock);
1519         return E_FAIL;
1520     }
1521     ppng_set_error_fn(This->png_ptr, jmpbuf, user_error_fn, user_warning_fn);
1522
1523     /* set up custom i/o handling */
1524     ppng_set_write_fn(This->png_ptr, This, user_write_data, user_flush);
1525
1526     LeaveCriticalSection(&This->lock);
1527
1528     return S_OK;
1529 }
1530
1531 static HRESULT WINAPI PngEncoder_GetContainerFormat(IWICBitmapEncoder *iface,
1532     GUID *pguidContainerFormat)
1533 {
1534     FIXME("(%p,%s): stub\n", iface, debugstr_guid(pguidContainerFormat));
1535     return E_NOTIMPL;
1536 }
1537
1538 static HRESULT WINAPI PngEncoder_GetEncoderInfo(IWICBitmapEncoder *iface,
1539     IWICBitmapEncoderInfo **ppIEncoderInfo)
1540 {
1541     FIXME("(%p,%p): stub\n", iface, ppIEncoderInfo);
1542     return E_NOTIMPL;
1543 }
1544
1545 static HRESULT WINAPI PngEncoder_SetColorContexts(IWICBitmapEncoder *iface,
1546     UINT cCount, IWICColorContext **ppIColorContext)
1547 {
1548     FIXME("(%p,%u,%p): stub\n", iface, cCount, ppIColorContext);
1549     return E_NOTIMPL;
1550 }
1551
1552 static HRESULT WINAPI PngEncoder_SetPalette(IWICBitmapEncoder *iface, IWICPalette *pIPalette)
1553 {
1554     TRACE("(%p,%p)\n", iface, pIPalette);
1555     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1556 }
1557
1558 static HRESULT WINAPI PngEncoder_SetThumbnail(IWICBitmapEncoder *iface, IWICBitmapSource *pIThumbnail)
1559 {
1560     TRACE("(%p,%p)\n", iface, pIThumbnail);
1561     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1562 }
1563
1564 static HRESULT WINAPI PngEncoder_SetPreview(IWICBitmapEncoder *iface, IWICBitmapSource *pIPreview)
1565 {
1566     TRACE("(%p,%p)\n", iface, pIPreview);
1567     return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1568 }
1569
1570 static HRESULT WINAPI PngEncoder_CreateNewFrame(IWICBitmapEncoder *iface,
1571     IWICBitmapFrameEncode **ppIFrameEncode, IPropertyBag2 **ppIEncoderOptions)
1572 {
1573     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1574     HRESULT hr;
1575     TRACE("(%p,%p,%p)\n", iface, ppIFrameEncode, ppIEncoderOptions);
1576
1577     EnterCriticalSection(&This->lock);
1578
1579     if (This->frame_count != 0)
1580     {
1581         LeaveCriticalSection(&This->lock);
1582         return WINCODEC_ERR_UNSUPPORTEDOPERATION;
1583     }
1584
1585     if (!This->stream)
1586     {
1587         LeaveCriticalSection(&This->lock);
1588         return WINCODEC_ERR_NOTINITIALIZED;
1589     }
1590
1591     hr = CreatePropertyBag2(ppIEncoderOptions);
1592     if (FAILED(hr))
1593     {
1594         LeaveCriticalSection(&This->lock);
1595         return hr;
1596     }
1597
1598     This->frame_count = 1;
1599
1600     LeaveCriticalSection(&This->lock);
1601
1602     IWICBitmapEncoder_AddRef(iface);
1603     *ppIFrameEncode = &This->IWICBitmapFrameEncode_iface;
1604
1605     return S_OK;
1606 }
1607
1608 static HRESULT WINAPI PngEncoder_Commit(IWICBitmapEncoder *iface)
1609 {
1610     PngEncoder *This = impl_from_IWICBitmapEncoder(iface);
1611     TRACE("(%p)\n", iface);
1612
1613     EnterCriticalSection(&This->lock);
1614
1615     if (!This->frame_committed || This->committed)
1616     {
1617         LeaveCriticalSection(&This->lock);
1618         return WINCODEC_ERR_WRONGSTATE;
1619     }
1620
1621     This->committed = TRUE;
1622
1623     LeaveCriticalSection(&This->lock);
1624
1625     return S_OK;
1626 }
1627
1628 static HRESULT WINAPI PngEncoder_GetMetadataQueryWriter(IWICBitmapEncoder *iface,
1629     IWICMetadataQueryWriter **ppIMetadataQueryWriter)
1630 {
1631     FIXME("(%p,%p): stub\n", iface, ppIMetadataQueryWriter);
1632     return E_NOTIMPL;
1633 }
1634
1635 static const IWICBitmapEncoderVtbl PngEncoder_Vtbl = {
1636     PngEncoder_QueryInterface,
1637     PngEncoder_AddRef,
1638     PngEncoder_Release,
1639     PngEncoder_Initialize,
1640     PngEncoder_GetContainerFormat,
1641     PngEncoder_GetEncoderInfo,
1642     PngEncoder_SetColorContexts,
1643     PngEncoder_SetPalette,
1644     PngEncoder_SetThumbnail,
1645     PngEncoder_SetPreview,
1646     PngEncoder_CreateNewFrame,
1647     PngEncoder_Commit,
1648     PngEncoder_GetMetadataQueryWriter
1649 };
1650
1651 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1652 {
1653     PngEncoder *This;
1654     HRESULT ret;
1655
1656     TRACE("(%p,%s,%p)\n", pUnkOuter, debugstr_guid(iid), ppv);
1657
1658     *ppv = NULL;
1659
1660     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
1661
1662     if (!libpng_handle && !load_libpng())
1663     {
1664         ERR("Failed writing PNG because unable to find %s\n",SONAME_LIBPNG);
1665         return E_FAIL;
1666     }
1667
1668     This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngEncoder));
1669     if (!This) return E_OUTOFMEMORY;
1670
1671     This->IWICBitmapEncoder_iface.lpVtbl = &PngEncoder_Vtbl;
1672     This->IWICBitmapFrameEncode_iface.lpVtbl = &PngEncoder_FrameVtbl;
1673     This->ref = 1;
1674     This->png_ptr = NULL;
1675     This->info_ptr = NULL;
1676     This->stream = NULL;
1677     This->frame_count = 0;
1678     This->frame_initialized = FALSE;
1679     This->format = NULL;
1680     This->info_written = FALSE;
1681     This->width = 0;
1682     This->height = 0;
1683     This->xres = 0.0;
1684     This->yres = 0.0;
1685     This->lines_written = 0;
1686     This->frame_committed = FALSE;
1687     This->committed = FALSE;
1688     InitializeCriticalSection(&This->lock);
1689     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngEncoder.lock");
1690
1691     ret = IWICBitmapEncoder_QueryInterface(&This->IWICBitmapEncoder_iface, iid, ppv);
1692     IWICBitmapEncoder_Release(&This->IWICBitmapEncoder_iface);
1693
1694     return ret;
1695 }
1696
1697 #else /* !HAVE_PNG_H */
1698
1699 HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1700 {
1701     ERR("Trying to load PNG picture, but PNG support is not compiled in.\n");
1702     return E_FAIL;
1703 }
1704
1705 HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
1706 {
1707     ERR("Trying to save PNG picture, but PNG support is not compiled in.\n");
1708     return E_FAIL;
1709 }
1710
1711 #endif