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libwebp/examples/dwebp.c

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// Copyright 2010 Google Inc.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// simple command-line example calling libwebpdecode to
// decode a WebP image into a PPM image.
//
// Compile with: gcc -o dwebp dwebp.c -lwebpdecode
//
// Author: Skal (pascal.massimino@gmail.com)
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef WEBP_HAVE_PNG
#include <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 <shlwapi.h>
#include <windows.h>
#include <wincodec.h>
#endif
#include "webp/decode.h"
#include "stopwatch.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
//-----------------------------------------------------------------------------
extern void* VP8DecGetCPUInfo; // opaque forward declaration.
static int verbose = 0;
#ifdef HAVE_WINCODEC_H
#define IFS(fn) \
do { \
if (SUCCEEDED(hr)) \
{ \
hr = (fn); \
if (FAILED(hr) && verbose) \
printf(#fn " failed %08x\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, IStream** ppStream) {
HRESULT hr = S_OK;
IFS(SHCreateStreamOnFileA(out_file_name, STGM_WRITE | STGM_CREATE, ppStream));
if (FAILED(hr))
printf("Error opening output file %s (%08x)\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) {
HRESULT hr = S_OK;
IWICImagingFactory* pFactory = NULL;
IWICBitmapFrameEncode* pFrame = NULL;
IWICBitmapEncoder* pEncoder = NULL;
IStream* pStream = NULL;
GUID pixel_format = GUID_WICPixelFormat24bppBGR;
IFS(CoInitialize(NULL));
IFS(CoCreateInstance(MAKE_REFGUID(CLSID_WICImagingFactory), NULL,
CLSCTX_INPROC_SERVER, MAKE_REFGUID(IID_IWICImagingFactory),
(LPVOID*)&pFactory));
if (hr == REGDB_E_CLASSNOTREG) {
printf("Couldn't access Windows Imaging Component (are you running \n");
printf("Windows XP SP3 or newer?). PNG support not available.\n");
printf("Use -ppm or -pgm for available PPM and PGM formats.\n");
}
IFS(CreateOutputStream(out_file_name, &pStream));
IFS(IWICImagingFactory_CreateEncoder(pFactory, container_guid, NULL,
&pEncoder));
IFS(IWICBitmapEncoder_Initialize(pEncoder, pStream,
WICBitmapEncoderNoCache));
IFS(IWICBitmapEncoder_CreateNewFrame(pEncoder, &pFrame, NULL));
IFS(IWICBitmapFrameEncode_Initialize(pFrame, NULL));
IFS(IWICBitmapFrameEncode_SetSize(pFrame, width, height));
IFS(IWICBitmapFrameEncode_SetPixelFormat(pFrame, &pixel_format));
IFS(IWICBitmapFrameEncode_WritePixels(pFrame, height, stride,
height * stride, rgb));
IFS(IWICBitmapFrameEncode_Commit(pFrame));
IFS(IWICBitmapEncoder_Commit(pEncoder));
if (pFrame != NULL) IUnknown_Release(pFrame);
if (pEncoder != NULL) IUnknown_Release(pEncoder);
if (pFactory != NULL) IUnknown_Release(pFactory);
if (pStream != NULL) IUnknown_Release(pStream);
return hr;
}
static int WritePNG(const char* out_file_name, unsigned char* rgb, int stride,
uint32_t width, uint32_t height, int has_alpha) {
assert(!has_alpha); // TODO(mikolaj)
return SUCCEEDED(WriteUsingWIC(out_file_name,
MAKE_REFGUID(GUID_ContainerFormatPng), rgb, stride, width,
height));
}
#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, unsigned char* rgb, int stride,
png_uint_32 width, png_uint_32 height, int has_alpha) {
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
typedef uint32_t png_uint_32;
static int WritePNG(FILE* out_file, unsigned char* rgb, int stride,
png_uint_32 width, png_uint_32 height, int has_alpha) {
printf("PNG support not compiled. Please install the libpng development "
"package before building.\n");
printf("You can run with -ppm flag to decode in PPM format.\n");
return 0;
}
#endif
static int WritePPM(FILE* fout, const unsigned char* rgb,
uint32_t width, uint32_t height) {
fprintf(fout, "P6\n%d %d\n255\n", width, height);
return (fwrite(rgb, width * height, 3, fout) == 3);
}
static int WriteAlphaPlane(FILE* fout, const unsigned char* rgba,
uint32_t width, uint32_t height) {
uint32_t y;
fprintf(fout, "P5\n%d %d\n255\n", width, height);
for (y = 0; y < height; ++y) {
const unsigned char* line = rgba + y * (width * 4);
uint32_t x;
for (x = 0; x < width; ++x) {
if (fputc(line[4 * x + 3], fout) == EOF) {
return 0;
}
}
}
return 1;
}
static int WritePGM(FILE* fout,
unsigned char* y_plane, unsigned char *u, unsigned char* v,
int y_stride, int uv_stride,
uint32_t width, uint32_t height) {
// 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.
int ok = 1;
unsigned int y;
const unsigned int uv_width = (width + 1) / 2;
const unsigned int uv_height = (height + 1) / 2;
const unsigned int out_stride = (width + 1) & ~1;
fprintf(fout, "P5\n%d %d\n255\n", out_stride, height + uv_height);
for (y = 0; ok && y < height; ++y) {
ok &= (fwrite(y_plane + y * y_stride, width, 1, fout) == 1);
if (width & 1) fputc(0, fout); // padding byte
}
for (y = 0; ok && y < uv_height; ++y) {
ok &= (fwrite(u + y * uv_stride, uv_width, 1, fout) == 1);
ok &= (fwrite(v + y * uv_stride, uv_width, 1, fout) == 1);
}
return ok;
}
typedef enum {
PNG = 0,
PPM,
PGM,
ALPHA_PLANE_ONLY // this is for experimenting only
} OutputFileFormat;
static void Help(void) {
printf("Usage: dwebp "
"[in_file] [-h] [-v] [-ppm] [-pgm] [-version] [-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"
" -ppm: save the raw RGB samples as color PPM\n"
" -pgm: save the raw YUV samples as a grayscale PGM\n"
" file with IMC4 layout.\n"
" -version: print version number and exit.\n"
"Use -v for verbose (e.g. print encoding/decoding times)\n"
"Use -noasm to disable all assembly optimizations.\n"
);
}
int main(int argc, const char *argv[]) {
const char *in_file = NULL;
const char *out_file = NULL;
int width, height, stride, uv_stride;
int has_alpha = 0;
uint8_t* out = NULL, *u = NULL, *v = NULL;
OutputFileFormat format = PNG;
Stopwatch stop_watch;
int c;
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], "-ppm")) {
format = PPM;
} 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], "-v")) {
verbose = 1;
} else if (!strcmp(argv[c], "-noasm")) {
VP8DecGetCPUInfo = NULL;
} else if (argv[c][0] == '-') {
printf("Unknown option '%s'\n", argv[c]);
Help();
return -1;
} else {
in_file = argv[c];
}
}
if (in_file == NULL) {
printf("missing input file!!\n");
Help();
return -1;
}
{
uint32_t data_size = 0;
void* data = NULL;
int ok;
FILE* const in = fopen(in_file, "rb");
if (!in) {
fprintf(stderr, "cannot open input file '%s'\n", in_file);
return 1;
}
fseek(in, 0, SEEK_END);
data_size = ftell(in);
fseek(in, 0, SEEK_SET);
data = malloc(data_size);
ok = (fread(data, data_size, 1, in) == 1);
fclose(in);
if (!ok) {
free(data);
return -1;
}
if (verbose)
StopwatchReadAndReset(&stop_watch);
switch (format) {
case PNG:
#ifdef _WIN32
out = WebPDecodeBGR((const uint8_t*)data, data_size, &width, &height);
stride = 3 * width;
has_alpha = 0;
#else
out = WebPDecodeRGBA((const uint8_t*)data, data_size, &width, &height);
stride = 4 * width;
has_alpha = 1;
#endif
break;
case PPM:
out = WebPDecodeRGB((const uint8_t*)data, data_size, &width, &height);
break;
case PGM:
out = WebPDecodeYUV((const uint8_t*)data, data_size, &width, &height,
&u, &v, &stride, &uv_stride);
break;
case ALPHA_PLANE_ONLY:
out = WebPDecodeRGBA((const uint8_t*)data, data_size, &width, &height);
break;
default:
free(data);
return -1;
}
if (verbose) {
const double time = StopwatchReadAndReset(&stop_watch);
printf("Time to decode picture: %.3fs\n", time);
}
free(data);
}
if (!out) {
fprintf(stderr, "Decoding of %s failed.\n", in_file);
return -1;
}
if (out_file) {
FILE* fout = NULL;
int needs_open_file = 0;
printf("Decoded %s. Dimensions: %d x %d. Now saving...\n", in_file, width, height);
StopwatchReadAndReset(&stop_watch);
#ifdef _WIN32
if (format != PNG) {
needs_open_file = 1;
}
#else
needs_open_file = 1;
#endif
if (needs_open_file) fout = fopen(out_file, "wb");
if (!needs_open_file || fout) {
int ok = 1;
if (format == PNG) {
#ifdef HAVE_WINCODEC_H
ok &= WritePNG(out_file, out, stride, width, height, has_alpha);
#else
ok &= WritePNG(fout, out, stride, width, height, has_alpha);
#endif
} else if (format == PPM) {
ok &= WritePPM(fout, out, width, height);
} else if (format == PGM) {
ok &= WritePGM(fout, out, u, v, stride, uv_stride, width, height);
} else if (format == ALPHA_PLANE_ONLY) {
ok &= WriteAlphaPlane(fout, out, width, height);
}
if (fout)
fclose(fout);
if (ok) {
printf("Saved file %s\n", out_file);
if (verbose) {
const double time = StopwatchReadAndReset(&stop_watch);
printf("Time to write output: %.3fs\n", time);
}
} else {
fprintf(stderr, "Error writing file %s !!\n", out_file);
}
} else {
fprintf(stderr, "Error opening output file %s\n", out_file);
}
} else {
printf("File %s can be decoded (dimensions: %d x %d).\n",
in_file, width, height);
printf("Nothing written; use -o flag to save the result as e.g. PNG.\n");
}
free(out);
return 0;
}
//-----------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
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