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webp-src/examples/dwebp.c  view on Meta::CPAN

  IFS(SHCreateStreamOnFileA(out_file_name, STGM_WRITE | STGM_CREATE, stream));
  if (FAILED(hr)) {
    fprintf(stderr, "Error opening output file %s (%08lx)\n",
            out_file_name, hr);
  }
  return hr;
}

static HRESULT WriteUsingWIC(const char* out_file_name, REFGUID container_guid,
                             unsigned char* rgb, int stride,
                             uint32_t width, uint32_t height, int has_alpha) {
  HRESULT hr = S_OK;
  IWICImagingFactory* factory = NULL;
  IWICBitmapFrameEncode* frame = NULL;
  IWICBitmapEncoder* encoder = NULL;
  IStream* stream = NULL;
  WICPixelFormatGUID pixel_format = has_alpha ? GUID_WICPixelFormat32bppBGRA
                                              : GUID_WICPixelFormat24bppBGR;

  IFS(CoInitialize(NULL));
  IFS(CoCreateInstance(MAKE_REFGUID(CLSID_WICImagingFactory), NULL,
                       CLSCTX_INPROC_SERVER,
                       MAKE_REFGUID(IID_IWICImagingFactory),
                       (LPVOID*)&factory));
  if (hr == REGDB_E_CLASSNOTREG) {
    fprintf(stderr,
            "Couldn't access Windows Imaging Component (are you running "
            "Windows XP SP3 or newer?). PNG support not available. "
            "Use -ppm or -pgm for available PPM and PGM formats.\n");
  }
  IFS(CreateOutputStream(out_file_name, &stream));
  IFS(IWICImagingFactory_CreateEncoder(factory, container_guid, NULL,
                                       &encoder));
  IFS(IWICBitmapEncoder_Initialize(encoder, stream,
                                   WICBitmapEncoderNoCache));
  IFS(IWICBitmapEncoder_CreateNewFrame(encoder, &frame, NULL));
  IFS(IWICBitmapFrameEncode_Initialize(frame, NULL));
  IFS(IWICBitmapFrameEncode_SetSize(frame, width, height));
  IFS(IWICBitmapFrameEncode_SetPixelFormat(frame, &pixel_format));
  IFS(IWICBitmapFrameEncode_WritePixels(frame, height, stride,
                                        height * stride, rgb));
  IFS(IWICBitmapFrameEncode_Commit(frame));
  IFS(IWICBitmapEncoder_Commit(encoder));

  if (frame != NULL) IUnknown_Release(frame);
  if (encoder != NULL) IUnknown_Release(encoder);
  if (factory != NULL) IUnknown_Release(factory);
  if (stream != NULL) IUnknown_Release(stream);
  return hr;
}

static int WritePNG(const char* out_file_name,
                    const WebPDecBuffer* const buffer) {
  const uint32_t width = buffer->width;
  const uint32_t height = buffer->height;
  unsigned char* const rgb = buffer->u.RGBA.rgba;
  const int stride = buffer->u.RGBA.stride;
  const int has_alpha = (buffer->colorspace == MODE_BGRA);

  return SUCCEEDED(WriteUsingWIC(out_file_name,
                                 MAKE_REFGUID(GUID_ContainerFormatPng),
                                 rgb, stride, width, height, has_alpha));
}

#elif defined(WEBP_HAVE_PNG)    // !HAVE_WINCODEC_H
static void PNGAPI error_function(png_structp png, png_const_charp dummy) {
  (void)dummy;  // remove variable-unused warning
  longjmp(png_jmpbuf(png), 1);
}

static int WritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
  const uint32_t width = buffer->width;
  const uint32_t height = buffer->height;
  unsigned char* const rgb = buffer->u.RGBA.rgba;
  const int stride = buffer->u.RGBA.stride;
  const int has_alpha = (buffer->colorspace == MODE_RGBA);
  png_structp png;
  png_infop info;
  png_uint_32 y;

  png = png_create_write_struct(PNG_LIBPNG_VER_STRING,
                                NULL, error_function, NULL);
  if (png == NULL) {
    return 0;
  }
  info = png_create_info_struct(png);
  if (info == NULL) {
    png_destroy_write_struct(&png, NULL);
    return 0;
  }
  if (setjmp(png_jmpbuf(png))) {
    png_destroy_write_struct(&png, &info);
    return 0;
  }
  png_init_io(png, out_file);
  png_set_IHDR(png, info, width, height, 8,
               has_alpha ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB,
               PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
               PNG_FILTER_TYPE_DEFAULT);
  png_write_info(png, info);
  for (y = 0; y < height; ++y) {
    png_bytep row = rgb + y * stride;
    png_write_rows(png, &row, 1);
  }
  png_write_end(png, info);
  png_destroy_write_struct(&png, &info);
  return 1;
}
#else    // !HAVE_WINCODEC_H && !WEBP_HAVE_PNG
static int WritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
  (void)out_file;
  (void)buffer;
  fprintf(stderr, "PNG support not compiled. Please install the libpng "
          "development package before building.\n");
  fprintf(stderr, "You can run with -ppm flag to decode in PPM format.\n");
  return 0;
}
#endif

static int WritePPM(FILE* fout, const WebPDecBuffer* const buffer, int alpha) {
  const uint32_t width = buffer->width;