// Copyright 2011 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 WebP file viewer. // // Compiling on linux: // sudo apt-get install libglut3-dev mesa-common-dev // gcc -o vwebp vwebp.c -O3 -lwebp -lglut -lGL // Compiling on Mac + XCode: // gcc -o vwebp vwebp.c -lwebp -framework GLUT -framework OpenGL // // Author: Skal (pascal.massimino@gmail.com) #include #include #include #include "webp/decode.h" #ifdef __APPLE__ #include #else #include #ifdef FREEGLUT #include #endif #endif // Unfortunate global variables static const WebPDecBuffer* kPic = NULL; static const char* file_name = NULL; static int print_info = 0; //------------------------------------------------------------------------------ // Callbacks static void HandleKey(unsigned char key, int pos_x, int pos_y) { (void)pos_x; (void)pos_y; if (key == 'q' || key == 'Q' || key == 27 /* Esc */) { #ifdef FREEGLUT glutLeaveMainLoop(); #else WebPFreeDecBuffer((WebPDecBuffer*)kPic); kPic = NULL; exit(0); #endif } else if (key == 'i') { print_info = 1 - print_info; glutPostRedisplay(); } } static void HandleReshape(int width, int height) { // TODO(skal): proper handling of resize, esp. for large pictures. // + key control of the zoom. glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } static void PrintString(const char* const text) { void* const font = GLUT_BITMAP_9_BY_15; int i; for (i = 0; text[i]; ++i) { glutBitmapCharacter(font, text[i]); } } static void HandleDisplay(void) { if (kPic == NULL) return; glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glPixelZoom(1, -1); glRasterPos2f(-1, 1); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glPixelStorei(GL_UNPACK_ROW_LENGTH, kPic->u.RGBA.stride / 4); glDrawPixels(kPic->width, kPic->height, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)kPic->u.RGBA.rgba); if (print_info) { char tmp[32]; glColor4f(0.0, 0.0, 0.0, 0.0); glRasterPos2f(-0.95, 0.90); PrintString(file_name); snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", kPic->width, kPic->height); glColor4f(0.0, 0.0, 0.0, 0.0); glRasterPos2f(-0.95, 0.80); PrintString(tmp); } glFlush(); } static void Show(const WebPDecBuffer* const pic) { glutInitDisplayMode(GLUT_RGBA); glutInitWindowSize(pic->width, pic->height); glutCreateWindow("WebP viewer"); glutReshapeFunc(HandleReshape); glutDisplayFunc(HandleDisplay); glutIdleFunc(NULL); glutKeyboardFunc(HandleKey); glClearColor(0.0, 0.0, 0.0, 0.0); HandleReshape(pic->width, pic->height); glutMainLoop(); } //------------------------------------------------------------------------------ // File decoding static const char* const kStatusMessages[] = { "OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR", "UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA" }; static int Decode(const char* const in_file, WebPDecoderConfig* const config) { WebPDecBuffer* const output_buffer = &config->output; WebPBitstreamFeatures* const bitstream = &config->input; VP8StatusCode status = VP8_STATUS_OK; int ok; size_t data_size = 0; void* data = NULL; FILE* const in = fopen(in_file, "rb"); if (!in) { fprintf(stderr, "cannot open input file '%s'\n", in_file); return 0; } fseek(in, 0, SEEK_END); data_size = ftell(in); fseek(in, 0, SEEK_SET); data = malloc(data_size); if (data == NULL) return 0; ok = (fread(data, data_size, 1, in) == 1); fclose(in); if (!ok) { fprintf(stderr, "Could not read %zu bytes of data from file %s\n", data_size, in_file); free(data); return 0; } status = WebPGetFeatures((const uint8_t*)data, data_size, bitstream); if (status != VP8_STATUS_OK) { goto end; } output_buffer->colorspace = MODE_RGBA; status = WebPDecode((const uint8_t*)data, data_size, config); end: free(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]); } return ok; } //------------------------------------------------------------------------------ // Main static void Help(void) { printf("Usage: vwebp in_file [options]\n\n" "Decodes the WebP image file and visualize it using OpenGL\n" "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" " -h ....... this help message.\n" ); } int main(int argc, char *argv[]) { WebPDecoderConfig config; 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], "-nofancy")) { config.options.no_fancy_upsampling = 1; } else if (!strcmp(argv[c], "-nofilter")) { config.options.bypass_filtering = 1; } 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], "-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 (argv[c][0] == '-') { printf("Unknown option '%s'\n", argv[c]); Help(); return -1; } else { file_name = argv[c]; } } if (file_name == NULL) { printf("missing input file!!\n"); Help(); return -1; } if (!Decode(file_name, &config)) { return -1; } kPic = &config.output; printf("Displaying [%s]: %d x %d. Press Esc to exit, 'i' for info.\n", file_name, kPic->width, kPic->height); glutInit(&argc, argv); Show(kPic); // Should only be reached when using FREEGLUT: WebPFreeDecBuffer(&config.output); return 0; } //------------------------------------------------------------------------------