7937b409e7
Quite handy and simple (for now). It's not yet incorporated within the build system (autotools or makefile.unix), because it gets complicated with OpenGL. TODO(later). For now, there's some ready-to-use command line for compiling on Linux or Mac in the header of vwebp.c Later, this tool will be supplemented with support for animation, tiling, zooming, etc. Change-Id: I292972cea4862536afbe8c9ec444c590d152f086
249 lines
7.1 KiB
C
249 lines
7.1 KiB
C
// Copyright 2011 Google Inc.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// Simple WebP file viewer.
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//
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// Compiling on linux:
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// sudo apt-get install libglut3-dev mesa-common-dev
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// gcc -o vwebp vwebp.c -O3 -lwebp -lglut -lGL
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// Compiling on Mac + XCode:
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// gcc -o vwebp vwebp.c -lwebp -framework GLUT -framework OpenGL
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "webp/decode.h"
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#ifdef __APPLE__
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#include <GLUT/glut.h>
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#else
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#include <GL/glut.h>
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#ifdef FREEGLUT
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#include <GL/freeglut.h>
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#endif
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#endif
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// Unfortunate global variables
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static const WebPDecBuffer* kPic = NULL;
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static const char* file_name = NULL;
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static int print_info = 0;
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//------------------------------------------------------------------------------
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// Callbacks
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static void HandleKey(unsigned char key, int pos_x, int pos_y) {
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(void)pos_x;
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(void)pos_y;
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if (key == 'q' || key == 'Q' || key == 27 /* Esc */) {
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#ifdef FREEGLUT
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glutLeaveMainLoop();
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#else
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WebPFreeDecBuffer((WebPDecBuffer*)kPic);
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kPic = NULL;
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exit(0);
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#endif
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} else if (key == 'i') {
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print_info = 1 - print_info;
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glutPostRedisplay();
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}
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}
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static void HandleReshape(int width, int height) {
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// TODO(skal): proper handling of resize, esp. for large pictures.
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// + key control of the zoom.
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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static void PrintString(const char* const text) {
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void* const font = GLUT_BITMAP_9_BY_15;
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int i;
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for (i = 0; text[i]; ++i) {
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glutBitmapCharacter(font, text[i]);
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}
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}
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static void HandleDisplay(void) {
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if (kPic == NULL) return;
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glPixelZoom(1, -1);
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glRasterPos2f(-1, 1);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, kPic->u.RGBA.stride / 4);
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glDrawPixels(kPic->width, kPic->height, GL_RGBA, GL_UNSIGNED_BYTE,
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(GLvoid*)kPic->u.RGBA.rgba);
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if (print_info) {
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char tmp[32];
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glColor4f(0.0, 0.0, 0.0, 0.0);
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glRasterPos2f(-0.95, 0.90);
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PrintString(file_name);
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snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", kPic->width, kPic->height);
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glColor4f(0.0, 0.0, 0.0, 0.0);
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glRasterPos2f(-0.95, 0.80);
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PrintString(tmp);
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}
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glFlush();
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}
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static void Show(const WebPDecBuffer* const pic) {
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glutInitDisplayMode(GLUT_RGBA);
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glutInitWindowSize(pic->width, pic->height);
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glutCreateWindow("WebP viewer");
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glutReshapeFunc(HandleReshape);
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glutDisplayFunc(HandleDisplay);
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glutIdleFunc(NULL);
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glutKeyboardFunc(HandleKey);
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glClearColor(0.0, 0.0, 0.0, 0.0);
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HandleReshape(pic->width, pic->height);
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glutMainLoop();
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}
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//------------------------------------------------------------------------------
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// File decoding
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static const char* const kStatusMessages[] = {
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"OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
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"UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
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};
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static int Decode(const char* const in_file, WebPDecoderConfig* const config) {
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WebPDecBuffer* const output_buffer = &config->output;
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WebPBitstreamFeatures* const bitstream = &config->input;
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VP8StatusCode status = VP8_STATUS_OK;
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int ok;
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size_t data_size = 0;
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void* data = NULL;
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FILE* const in = fopen(in_file, "rb");
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if (!in) {
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fprintf(stderr, "cannot open input file '%s'\n", in_file);
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return 0;
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}
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fseek(in, 0, SEEK_END);
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data_size = ftell(in);
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fseek(in, 0, SEEK_SET);
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data = malloc(data_size);
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if (data == NULL) return 0;
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ok = (fread(data, data_size, 1, in) == 1);
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fclose(in);
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if (!ok) {
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fprintf(stderr, "Could not read %zu bytes of data from file %s\n",
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data_size, in_file);
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free(data);
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return 0;
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}
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status = WebPGetFeatures((const uint8_t*)data, data_size, bitstream);
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if (status != VP8_STATUS_OK) {
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goto end;
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}
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output_buffer->colorspace = MODE_RGBA;
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status = WebPDecode((const uint8_t*)data, data_size, config);
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end:
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free(data);
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ok = (status == VP8_STATUS_OK);
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if (!ok) {
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fprintf(stderr, "Decoding of %s failed.\n", in_file);
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fprintf(stderr, "Status: %d (%s)\n", status, kStatusMessages[status]);
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}
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return ok;
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}
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//------------------------------------------------------------------------------
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// Main
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static void Help(void) {
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printf("Usage: vwebp in_file [options]\n\n"
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"Decodes the WebP image file and visualize it using OpenGL\n"
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"Options are:\n"
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" -version .... print version number and exit.\n"
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" -nofancy ..... don't use the fancy YUV420 upscaler.\n"
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" -nofilter .... disable in-loop filtering.\n"
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" -mt .......... use multi-threading\n"
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" -crop <x> <y> <w> <h> ... crop output with the given rectangle\n"
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" -scale <w> <h> .......... scale the output (*after* any cropping)\n"
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" -h ....... this help message.\n"
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);
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}
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int main(int argc, char *argv[]) {
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WebPDecoderConfig config;
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int c;
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if (!WebPInitDecoderConfig(&config)) {
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fprintf(stderr, "Library version mismatch!\n");
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return -1;
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}
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for (c = 1; c < argc; ++c) {
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if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
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Help();
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return 0;
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} else if (!strcmp(argv[c], "-nofancy")) {
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config.options.no_fancy_upsampling = 1;
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} else if (!strcmp(argv[c], "-nofilter")) {
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config.options.bypass_filtering = 1;
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} else if (!strcmp(argv[c], "-version")) {
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const int version = WebPGetDecoderVersion();
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printf("%d.%d.%d\n",
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(version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
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return 0;
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} else if (!strcmp(argv[c], "-mt")) {
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config.options.use_threads = 1;
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} else if (!strcmp(argv[c], "-crop") && c < argc - 4) {
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config.options.use_cropping = 1;
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config.options.crop_left = strtol(argv[++c], NULL, 0);
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config.options.crop_top = strtol(argv[++c], NULL, 0);
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config.options.crop_width = strtol(argv[++c], NULL, 0);
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config.options.crop_height = strtol(argv[++c], NULL, 0);
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} else if (!strcmp(argv[c], "-scale") && c < argc - 2) {
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config.options.use_scaling = 1;
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config.options.scaled_width = strtol(argv[++c], NULL, 0);
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config.options.scaled_height = strtol(argv[++c], NULL, 0);
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} else if (argv[c][0] == '-') {
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printf("Unknown option '%s'\n", argv[c]);
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Help();
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return -1;
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} else {
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file_name = argv[c];
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}
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}
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if (file_name == NULL) {
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printf("missing input file!!\n");
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Help();
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return -1;
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}
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if (!Decode(file_name, &config)) {
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return -1;
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}
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kPic = &config.output;
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printf("Displaying [%s]: %d x %d. Press Esc to exit, 'i' for info.\n",
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file_name, kPic->width, kPic->height);
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glutInit(&argc, argv);
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Show(kPic);
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// Should only be reached when using FREEGLUT:
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WebPFreeDecBuffer(&config.output);
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return 0;
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}
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//------------------------------------------------------------------------------
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