// Copyright 2010 Google Inc. All Rights Reserved. // // Use of this source code is governed by a BSD-style license // that can be found in the COPYING file in the root of the source // tree. An additional intellectual property rights grant can be found // in the file PATENTS. All contributing project authors may // be found in the AUTHORS file in the root of the source tree. // ----------------------------------------------------------------------------- // // Command-line tool for decoding a WebP image. // // Author: Skal (pascal.massimino@gmail.com) #include #include #include #include #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef WEBP_HAVE_PNG #include #endif #ifdef HAVE_WINCODEC_H #ifdef __MINGW32__ #define INITGUID // Without this GUIDs are declared extern and fail to link #endif #define CINTERFACE #define COBJMACROS #define _WIN32_IE 0x500 // Workaround bug in shlwapi.h when compiling C++ // code with COBJMACROS. #include // CreateStreamOnHGlobal() #include #include #include #endif #if defined(_WIN32) #include // for _O_BINARY #include // for _setmode() #endif #include "webp/decode.h" #include "./example_util.h" #include "./stopwatch.h" static int verbose = 0; #ifndef WEBP_DLL #if defined(__cplusplus) || defined(c_plusplus) extern "C" { #endif extern void* VP8GetCPUInfo; // opaque forward declaration. #if defined(__cplusplus) || defined(c_plusplus) } // extern "C" #endif #endif // WEBP_DLL //------------------------------------------------------------------------------ // Output types typedef enum { PNG = 0, PAM, PPM, PGM, BMP, TIFF, YUV, ALPHA_PLANE_ONLY // this is for experimenting only } OutputFileFormat; #ifdef HAVE_WINCODEC_H #define IFS(fn) \ do { \ if (SUCCEEDED(hr)) { \ hr = (fn); \ if (FAILED(hr)) fprintf(stderr, #fn " failed %08lx\n", hr); \ } \ } while (0) #ifdef __cplusplus #define MAKE_REFGUID(x) (x) #else #define MAKE_REFGUID(x) &(x) #endif static HRESULT CreateOutputStream(const char* out_file_name, int write_to_mem, IStream** stream) { HRESULT hr = S_OK; if (write_to_mem) { // Output to a memory buffer. This is freed when 'stream' is released. IFS(CreateStreamOnHGlobal(NULL, TRUE, stream)); } else { 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, int use_stdout, REFGUID container_guid, uint8_t* 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, use_stdout, &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 (SUCCEEDED(hr) && use_stdout) { HGLOBAL image; IFS(GetHGlobalFromStream(stream, &image)); if (SUCCEEDED(hr)) { HANDLE std_output = GetStdHandle(STD_OUTPUT_HANDLE); DWORD mode; const BOOL update_mode = GetConsoleMode(std_output, &mode); const void* const image_mem = GlobalLock(image); DWORD bytes_written = 0; // Clear output processing if necessary, then output the image. if (update_mode) SetConsoleMode(std_output, 0); if (!WriteFile(std_output, image_mem, (DWORD)GlobalSize(image), &bytes_written, NULL) || bytes_written != GlobalSize(image)) { hr = E_FAIL; } if (update_mode) SetConsoleMode(std_output, mode); GlobalUnlock(image); } } 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, int use_stdout, const WebPDecBuffer* const buffer) { const uint32_t width = buffer->width; const uint32_t height = buffer->height; uint8_t* 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, use_stdout, 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; uint8_t* 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; const uint32_t height = buffer->height; const uint8_t* const rgb = buffer->u.RGBA.rgba; const int stride = buffer->u.RGBA.stride; const size_t bytes_per_px = alpha ? 4 : 3; uint32_t y; if (alpha) { fprintf(fout, "P7\nWIDTH %d\nHEIGHT %d\nDEPTH 4\nMAXVAL 255\n" "TUPLTYPE RGB_ALPHA\nENDHDR\n", width, height); } else { fprintf(fout, "P6\n%d %d\n255\n", width, height); } for (y = 0; y < height; ++y) { if (fwrite(rgb + y * stride, width, bytes_per_px, fout) != bytes_per_px) { return 0; } } return 1; } static void PutLE16(uint8_t* const dst, uint32_t value) { dst[0] = (value >> 0) & 0xff; dst[1] = (value >> 8) & 0xff; } static void PutLE32(uint8_t* const dst, uint32_t value) { PutLE16(dst + 0, (value >> 0) & 0xffff); PutLE16(dst + 2, (value >> 16) & 0xffff); } #define BMP_HEADER_SIZE 54 static int WriteBMP(FILE* fout, const WebPDecBuffer* const buffer) { const int has_alpha = (buffer->colorspace != MODE_BGR); const uint32_t width = buffer->width; const uint32_t height = buffer->height; const uint8_t* const rgba = buffer->u.RGBA.rgba; const int stride = buffer->u.RGBA.stride; const uint32_t bytes_per_px = has_alpha ? 4 : 3; uint32_t y; const uint32_t line_size = bytes_per_px * width; const uint32_t bmp_stride = (line_size + 3) & ~3; // pad to 4 const uint32_t total_size = bmp_stride * height + BMP_HEADER_SIZE; uint8_t bmp_header[BMP_HEADER_SIZE] = { 0 }; // bitmap file header PutLE16(bmp_header + 0, 0x4d42); // signature 'BM' PutLE32(bmp_header + 2, total_size); // size including header PutLE32(bmp_header + 6, 0); // reserved PutLE32(bmp_header + 10, BMP_HEADER_SIZE); // offset to pixel array // bitmap info header PutLE32(bmp_header + 14, 40); // DIB header size PutLE32(bmp_header + 18, width); // dimensions PutLE32(bmp_header + 22, -(int)height); // vertical flip! PutLE16(bmp_header + 26, 1); // number of planes PutLE16(bmp_header + 28, bytes_per_px * 8); // bits per pixel PutLE32(bmp_header + 30, 0); // no compression (BI_RGB) PutLE32(bmp_header + 34, 0); // image size (dummy) PutLE32(bmp_header + 38, 2400); // x pixels/meter PutLE32(bmp_header + 42, 2400); // y pixels/meter PutLE32(bmp_header + 46, 0); // number of palette colors PutLE32(bmp_header + 50, 0); // important color count // TODO(skal): color profile // write header if (fwrite(bmp_header, sizeof(bmp_header), 1, fout) != 1) { return 0; } // write pixel array for (y = 0; y < height; ++y) { if (fwrite(rgba + y * stride, line_size, 1, fout) != 1) { return 0; } // write padding zeroes if (bmp_stride != line_size) { const uint8_t zeroes[3] = { 0 }; if (fwrite(zeroes, bmp_stride - line_size, 1, fout) != 1) { return 0; } } } return 1; } #undef BMP_HEADER_SIZE #define NUM_IFD_ENTRIES 15 #define EXTRA_DATA_SIZE 16 // 10b for signature/header + n * 12b entries + 4b for IFD terminator: #define EXTRA_DATA_OFFSET (10 + 12 * NUM_IFD_ENTRIES + 4) #define TIFF_HEADER_SIZE (EXTRA_DATA_OFFSET + EXTRA_DATA_SIZE) static int WriteTIFF(FILE* fout, const WebPDecBuffer* const buffer) { const int has_alpha = (buffer->colorspace != MODE_RGB); const uint32_t width = buffer->width; const uint32_t height = buffer->height; const uint8_t* const rgba = buffer->u.RGBA.rgba; const int stride = buffer->u.RGBA.stride; const uint8_t bytes_per_px = has_alpha ? 4 : 3; // For non-alpha case, we omit tag 0x152 (ExtraSamples). const uint8_t num_ifd_entries = has_alpha ? NUM_IFD_ENTRIES : NUM_IFD_ENTRIES - 1; uint8_t tiff_header[TIFF_HEADER_SIZE] = { 0x49, 0x49, 0x2a, 0x00, // little endian signature 8, 0, 0, 0, // offset to the unique IFD that follows // IFD (offset = 8). Entries must be written in increasing tag order. num_ifd_entries, 0, // Number of entries in the IFD (12 bytes each). 0x00, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 10: Width (TBD) 0x01, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 22: Height (TBD) 0x02, 0x01, 3, 0, bytes_per_px, 0, 0, 0, // 34: BitsPerSample: 8888 EXTRA_DATA_OFFSET + 0, 0, 0, 0, 0x03, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 46: Compression: none 0x06, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0, // 58: Photometric: RGB 0x11, 0x01, 4, 0, 1, 0, 0, 0, // 70: Strips offset: TIFF_HEADER_SIZE, 0, 0, 0, // data follows header 0x12, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 82: Orientation: topleft 0x15, 0x01, 3, 0, 1, 0, 0, 0, // 94: SamplesPerPixels bytes_per_px, 0, 0, 0, 0x16, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 106: Rows per strip (TBD) 0x17, 0x01, 4, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 118: StripByteCount (TBD) 0x1a, 0x01, 5, 0, 1, 0, 0, 0, // 130: X-resolution EXTRA_DATA_OFFSET + 8, 0, 0, 0, 0x1b, 0x01, 5, 0, 1, 0, 0, 0, // 142: Y-resolution EXTRA_DATA_OFFSET + 8, 0, 0, 0, 0x1c, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 154: PlanarConfiguration 0x28, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0, // 166: ResolutionUnit (inch) 0x52, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 178: ExtraSamples: rgbA 0, 0, 0, 0, // 190: IFD terminator // EXTRA_DATA_OFFSET: 8, 0, 8, 0, 8, 0, 8, 0, // BitsPerSample 72, 0, 0, 0, 1, 0, 0, 0 // 72 pixels/inch, for X/Y-resolution }; uint32_t y; // Fill placeholders in IFD: PutLE32(tiff_header + 10 + 8, width); PutLE32(tiff_header + 22 + 8, height); PutLE32(tiff_header + 106 + 8, height); PutLE32(tiff_header + 118 + 8, width * bytes_per_px * height); if (!has_alpha) PutLE32(tiff_header + 178, 0); // IFD terminator // write header if (fwrite(tiff_header, sizeof(tiff_header), 1, fout) != 1) { return 0; } // write pixel values for (y = 0; y < height; ++y) { if (fwrite(rgba + y * stride, bytes_per_px, width, fout) != width) { return 0; } } return 1; } #undef TIFF_HEADER_SIZE #undef EXTRA_DATA_OFFSET #undef EXTRA_DATA_SIZE #undef NUM_IFD_ENTRIES static int WriteAlphaPlane(FILE* fout, const WebPDecBuffer* const buffer) { const uint32_t width = buffer->width; const uint32_t height = buffer->height; const uint8_t* const a = buffer->u.YUVA.a; const int a_stride = buffer->u.YUVA.a_stride; uint32_t y; assert(a != NULL); fprintf(fout, "P5\n%d %d\n255\n", width, height); for (y = 0; y < height; ++y) { if (fwrite(a + y * a_stride, width, 1, fout) != 1) { return 0; } } return 1; } // format=PGM: save a grayscale PGM file using the IMC4 layout // (http://www.fourcc.org/yuv.php#IMC4). This is a very convenient format for // viewing the samples, esp. for odd dimensions. // format=YUV: just save the Y/U/V/A planes sequentially without header. static int WritePGMOrYUV(FILE* fout, const WebPDecBuffer* const buffer, OutputFileFormat format) { const int width = buffer->width; const int height = buffer->height; const WebPYUVABuffer* const yuv = &buffer->u.YUVA; int ok = 1; int y; const int pad = (format == YUV) ? 0 : 1; const int uv_width = (width + 1) / 2; const int uv_height = (height + 1) / 2; const int out_stride = (width + pad) & ~pad; const int a_height = yuv->a ? height : 0; if (format == PGM) { fprintf(fout, "P5\n%d %d\n255\n", out_stride, height + uv_height + a_height); } for (y = 0; ok && y < height; ++y) { ok &= (fwrite(yuv->y + y * yuv->y_stride, width, 1, fout) == 1); if (format == PGM) { if (width & 1) fputc(0, fout); // padding byte } } if (format == PGM) { // IMC4 layout for (y = 0; ok && y < uv_height; ++y) { ok &= (fwrite(yuv->u + y * yuv->u_stride, uv_width, 1, fout) == 1); ok &= (fwrite(yuv->v + y * yuv->v_stride, uv_width, 1, fout) == 1); } } else { for (y = 0; ok && y < uv_height; ++y) { ok &= (fwrite(yuv->u + y * yuv->u_stride, uv_width, 1, fout) == 1); } for (y = 0; ok && y < uv_height; ++y) { ok &= (fwrite(yuv->v + y * yuv->v_stride, uv_width, 1, fout) == 1); } } for (y = 0; ok && y < a_height; ++y) { ok &= (fwrite(yuv->a + y * yuv->a_stride, width, 1, fout) == 1); if (format == PGM) { if (width & 1) fputc(0, fout); // padding byte } } return ok; } static int SaveOutput(const WebPDecBuffer* const buffer, OutputFileFormat format, const char* const out_file) { FILE* fout = NULL; int needs_open_file = 1; const int use_stdout = !strcmp(out_file, "-"); int ok = 1; Stopwatch stop_watch; if (verbose) { StopwatchReset(&stop_watch); } #ifdef HAVE_WINCODEC_H needs_open_file = (format != PNG); #endif #if defined(_WIN32) if (use_stdout && _setmode(_fileno(stdout), _O_BINARY) == -1) { fprintf(stderr, "Failed to reopen stdout in O_BINARY mode.\n"); return -1; } #endif if (needs_open_file) { fout = use_stdout ? stdout : fopen(out_file, "wb"); if (fout == NULL) { fprintf(stderr, "Error opening output file %s\n", out_file); return 0; } } if (format == PNG) { #ifdef HAVE_WINCODEC_H ok &= WritePNG(out_file, use_stdout, buffer); #else ok &= WritePNG(fout, buffer); #endif } else if (format == PAM) { ok &= WritePPM(fout, buffer, 1); } else if (format == PPM) { ok &= WritePPM(fout, buffer, 0); } else if (format == BMP) { ok &= WriteBMP(fout, buffer); } else if (format == TIFF) { ok &= WriteTIFF(fout, buffer); } else if (format == PGM || format == YUV) { ok &= WritePGMOrYUV(fout, buffer, format); } else if (format == ALPHA_PLANE_ONLY) { ok &= WriteAlphaPlane(fout, buffer); } if (fout != NULL && fout != stdout) { fclose(fout); } if (ok) { if (use_stdout) { fprintf(stderr, "Saved to stdout\n"); } else { fprintf(stderr, "Saved file %s\n", out_file); } if (verbose) { const double write_time = StopwatchReadAndReset(&stop_watch); fprintf(stderr, "Time to write output: %.3fs\n", write_time); } } else { if (use_stdout) { fprintf(stderr, "Error writing to stdout !!\n"); } else { fprintf(stderr, "Error writing file %s !!\n", out_file); } } return ok; } static void Help(void) { printf("Usage: dwebp in_file [options] [-o out_file]\n\n" "Decodes the WebP image file to PNG format [Default]\n" "Use following options to convert into alternate image formats:\n" " -pam ......... save the raw RGBA samples as a color PAM\n" " -ppm ......... save the raw RGB samples as a color PPM\n" " -bmp ......... save as uncompressed BMP format\n" " -tiff ........ save as uncompressed TIFF format\n" " -pgm ......... save the raw YUV samples as a grayscale PGM\n" " file with IMC4 layout\n" " -yuv ......... save the raw YUV samples in flat layout\n" "\n" " Other options are:\n" " -version .... print version number and exit.\n" " -nofancy ..... don't use the fancy YUV420 upscaler.\n" " -nofilter .... disable in-loop filtering.\n" " -mt .......... use multi-threading\n" " -crop ... crop output with the given rectangle\n" " -scale .......... scale the output (*after* any cropping)\n" " -alpha ....... only save the alpha plane.\n" " -incremental . use incremental decoding (useful for tests)\n" " -h ....... this help message.\n" " -v ....... verbose (e.g. print encoding/decoding times)\n" #ifndef WEBP_DLL " -noasm ....... disable all assembly optimizations.\n" #endif ); } static const char* const kStatusMessages[] = { "OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR", "UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA" }; static const char* const kFormatType[] = { "unspecified", "lossy", "lossless" }; int main(int argc, const char *argv[]) { int ok = 0; const char *in_file = NULL; const char *out_file = NULL; WebPDecoderConfig config; WebPDecBuffer* const output_buffer = &config.output; WebPBitstreamFeatures* const bitstream = &config.input; OutputFileFormat format = PNG; int incremental = 0; int c; if (!WebPInitDecoderConfig(&config)) { fprintf(stderr, "Library version mismatch!\n"); return -1; } for (c = 1; c < argc; ++c) { if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) { Help(); return 0; } else if (!strcmp(argv[c], "-o") && c < argc - 1) { out_file = argv[++c]; } else if (!strcmp(argv[c], "-alpha")) { format = ALPHA_PLANE_ONLY; } else if (!strcmp(argv[c], "-nofancy")) { config.options.no_fancy_upsampling = 1; } else if (!strcmp(argv[c], "-nofilter")) { config.options.bypass_filtering = 1; } else if (!strcmp(argv[c], "-pam")) { format = PAM; } else if (!strcmp(argv[c], "-ppm")) { format = PPM; } else if (!strcmp(argv[c], "-bmp")) { format = BMP; } else if (!strcmp(argv[c], "-tiff")) { format = TIFF; } else if (!strcmp(argv[c], "-version")) { const int version = WebPGetDecoderVersion(); printf("%d.%d.%d\n", (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff); return 0; } else if (!strcmp(argv[c], "-pgm")) { format = PGM; } else if (!strcmp(argv[c], "-yuv")) { format = YUV; } else if (!strcmp(argv[c], "-mt")) { config.options.use_threads = 1; } else if (!strcmp(argv[c], "-crop") && c < argc - 4) { config.options.use_cropping = 1; config.options.crop_left = strtol(argv[++c], NULL, 0); config.options.crop_top = strtol(argv[++c], NULL, 0); config.options.crop_width = strtol(argv[++c], NULL, 0); config.options.crop_height = strtol(argv[++c], NULL, 0); } else if (!strcmp(argv[c], "-scale") && c < argc - 2) { config.options.use_scaling = 1; config.options.scaled_width = strtol(argv[++c], NULL, 0); config.options.scaled_height = strtol(argv[++c], NULL, 0); } else if (!strcmp(argv[c], "-v")) { verbose = 1; #ifndef WEBP_DLL } else if (!strcmp(argv[c], "-noasm")) { VP8GetCPUInfo = NULL; #endif } else if (!strcmp(argv[c], "-incremental")) { incremental = 1; } else if (argv[c][0] == '-') { fprintf(stderr, "Unknown option '%s'\n", argv[c]); Help(); return -1; } else { in_file = argv[c]; } } if (in_file == NULL) { fprintf(stderr, "missing input file!!\n"); Help(); return -1; } { Stopwatch stop_watch; VP8StatusCode status = VP8_STATUS_OK; size_t data_size = 0; const uint8_t* data = NULL; if (!ExUtilReadFile(in_file, &data, &data_size)) return -1; if (verbose) { StopwatchReset(&stop_watch); } status = WebPGetFeatures(data, data_size, bitstream); if (status != VP8_STATUS_OK) { goto end; } if (bitstream->has_animation) { fprintf(stderr, "Error! Decoding of an animated WebP file is not supported.\n" " Use webpmux to extract the individual frames or\n" " vwebp to view this image.\n"); } switch (format) { case PNG: #ifdef HAVE_WINCODEC_H output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR; #else output_buffer->colorspace = bitstream->has_alpha ? MODE_RGBA : MODE_RGB; #endif break; case PAM: output_buffer->colorspace = MODE_RGBA; break; case PPM: output_buffer->colorspace = MODE_RGB; // drops alpha for PPM break; case BMP: output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR; break; case TIFF: // note: force pre-multiplied alpha output_buffer->colorspace = bitstream->has_alpha ? MODE_rgbA : MODE_RGB; break; case PGM: case YUV: output_buffer->colorspace = bitstream->has_alpha ? MODE_YUVA : MODE_YUV; break; case ALPHA_PLANE_ONLY: output_buffer->colorspace = MODE_YUVA; break; default: free((void*)data); return -1; } // Decoding call. if (!incremental) { status = WebPDecode(data, data_size, &config); } else { WebPIDecoder* const idec = WebPINewDecoder(output_buffer); if (idec == NULL) { fprintf(stderr, "Failed during WebPINewDecoder().\n"); status = VP8_STATUS_OUT_OF_MEMORY; ok = 0; } else { status = WebPIUpdate(idec, data, data_size); WebPIDelete(idec); } } if (verbose) { const double decode_time = StopwatchReadAndReset(&stop_watch); fprintf(stderr, "Time to decode picture: %.3fs\n", decode_time); } end: free((void*)data); ok = (status == VP8_STATUS_OK); if (!ok) { fprintf(stderr, "Decoding of %s failed.\n", in_file); fprintf(stderr, "Status: %d (%s)\n", status, kStatusMessages[status]); goto Exit; } } if (out_file != NULL) { fprintf(stderr, "Decoded %s. Dimensions: %d x %d %s. Format: %s. " "Now saving...\n", in_file, output_buffer->width, output_buffer->height, bitstream->has_alpha ? " (with alpha)" : "", kFormatType[bitstream->format]); ok = SaveOutput(output_buffer, format, out_file); } else { fprintf(stderr, "File %s can be decoded " "(dimensions: %d x %d %s. Format: %s).\n", in_file, output_buffer->width, output_buffer->height, bitstream->has_alpha ? " (with alpha)" : "", kFormatType[bitstream->format]); fprintf(stderr, "Nothing written; " "use -o flag to save the result as e.g. PNG.\n"); } Exit: WebPFreeDecBuffer(output_buffer); return ok ? 0 : -1; } //------------------------------------------------------------------------------