| // 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 <assert.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include "webp/config.h" |
| #endif |
| |
| #ifdef WEBP_HAVE_PNG |
| #include <png.h> |
| #include <setjmp.h> // note: this must be included *after* png.h |
| #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 <ole2.h> // CreateStreamOnHGlobal() |
| #include <shlwapi.h> |
| #include <windows.h> |
| #include <wincodec.h> |
| #endif |
| |
| #include "webp/decode.h" |
| #include "./example_util.h" |
| #include "./stopwatch.h" |
| |
| static int verbose = 0; |
| #ifndef WEBP_DLL |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| extern void* VP8GetCPUInfo; // opaque forward declaration. |
| |
| #ifdef __cplusplus |
| } // 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 PNGErrorFunction(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); |
| volatile png_structp png; |
| volatile png_infop info; |
| png_uint_32 y; |
| |
| png = png_create_write_struct(PNG_LIBPNG_VER_STRING, |
| NULL, PNGErrorFunction, NULL); |
| if (png == NULL) { |
| return 0; |
| } |
| info = png_create_info_struct(png); |
| if (info == NULL) { |
| png_destroy_write_struct((png_structpp)&png, NULL); |
| return 0; |
| } |
| if (setjmp(png_jmpbuf(png))) { |
| png_destroy_write_struct((png_structpp)&png, (png_infopp)&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_structpp)&png, (png_infopp)&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 %u\nHEIGHT %u\nDEPTH 4\nMAXVAL 255\n" |
| "TUPLTYPE RGB_ALPHA\nENDHDR\n", width, height); |
| } else { |
| fprintf(fout, "P6\n%u %u\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%u %u\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 (needs_open_file) { |
| fout = use_stdout ? ExUtilSetBinaryMode(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" |
| " -nodither .... disable dithering\n" |
| " -dither <d> .. dithering strength (in 0..100)\n" |
| #if WEBP_DECODER_ABI_VERSION > 0x0204 |
| " -alpha_dither use alpha-plane dithering if needed\n" |
| #endif |
| " -mt .......... use multi-threading\n" |
| " -crop <x> <y> <w> <h> ... crop output with the given rectangle\n" |
| " -scale <w> <h> .......... scale the output (*after* any cropping)\n" |
| #if WEBP_DECODER_ABI_VERSION > 0x0203 |
| " -flip ........ flip the output vertically\n" |
| #endif |
| " -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 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) { |
| int parse_error = 0; |
| 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; |
| #if WEBP_DECODER_ABI_VERSION > 0x0204 |
| } else if (!strcmp(argv[c], "-alpha_dither")) { |
| config.options.alpha_dithering_strength = 100; |
| #endif |
| } else if (!strcmp(argv[c], "-nodither")) { |
| config.options.dithering_strength = 0; |
| } else if (!strcmp(argv[c], "-dither") && c < argc - 1) { |
| config.options.dithering_strength = |
| ExUtilGetInt(argv[++c], 0, &parse_error); |
| } else if (!strcmp(argv[c], "-crop") && c < argc - 4) { |
| config.options.use_cropping = 1; |
| config.options.crop_left = ExUtilGetInt(argv[++c], 0, &parse_error); |
| config.options.crop_top = ExUtilGetInt(argv[++c], 0, &parse_error); |
| config.options.crop_width = ExUtilGetInt(argv[++c], 0, &parse_error); |
| config.options.crop_height = ExUtilGetInt(argv[++c], 0, &parse_error); |
| } else if (!strcmp(argv[c], "-scale") && c < argc - 2) { |
| config.options.use_scaling = 1; |
| config.options.scaled_width = ExUtilGetInt(argv[++c], 0, &parse_error); |
| config.options.scaled_height = ExUtilGetInt(argv[++c], 0, &parse_error); |
| #if WEBP_DECODER_ABI_VERSION > 0x0203 |
| } else if (!strcmp(argv[c], "-flip")) { |
| config.options.flip = 1; |
| #endif |
| } 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 (!strcmp(argv[c], "--")) { |
| if (c < argc - 1) in_file = argv[++c]; |
| break; |
| } else if (argv[c][0] == '-') { |
| fprintf(stderr, "Unknown option '%s'\n", argv[c]); |
| Help(); |
| return -1; |
| } else { |
| in_file = argv[c]; |
| } |
| |
| if (parse_error) { |
| Help(); |
| return -1; |
| } |
| } |
| |
| if (in_file == NULL) { |
| fprintf(stderr, "missing input file!!\n"); |
| Help(); |
| return -1; |
| } |
| |
| { |
| VP8StatusCode status = VP8_STATUS_OK; |
| size_t data_size = 0; |
| const uint8_t* data = NULL; |
| if (!ExUtilLoadWebP(in_file, &data, &data_size, bitstream)) { |
| return -1; |
| } |
| |
| 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; |
| } |
| |
| if (incremental) { |
| status = ExUtilDecodeWebPIncremental(data, data_size, verbose, &config); |
| } else { |
| status = ExUtilDecodeWebP(data, data_size, verbose, &config); |
| } |
| |
| free((void*)data); |
| ok = (status == VP8_STATUS_OK); |
| if (!ok) { |
| ExUtilPrintWebPError(in_file, 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; |
| } |
| |
| //------------------------------------------------------------------------------ |
