webp/examples/vwebp.c

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// Copyright 2011 Google Inc. All Rights Reserved.
//
// 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 -lwebpmux -lglut -lGL -lpthread -lm
// Compiling on Mac + XCode:
// gcc -o vwebp vwebp.c -lwebp -lwebpmux -framework GLUT -framework OpenGL
//
// Author: Skal (pascal.massimino@gmail.com)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "webp/decode.h"
#include "webp/demux.h"
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#ifdef FREEGLUT
#include <GL/freeglut.h>
#endif
#endif
#include "./example_util.h"
#ifdef _MSC_VER
#define snprintf _snprintf
#endif
static void Help(void);
// Unfortunate global variables. Gathered into a struct for comfort.
static struct {
int has_animation;
int done;
int decoding_error;
int print_info;
int canvas_width, canvas_height;
int loop_count;
uint32_t bg_color;
const char* file_name;
WebPData data;
WebPDecoderConfig* config;
const WebPDecBuffer* pic;
WebPDemuxer* dmux;
WebPIterator frameiter;
} kParams;
static void ClearPreviousPic(void) {
WebPFreeDecBuffer((WebPDecBuffer*)kParams.pic);
kParams.pic = NULL;
}
static void ClearParams(void) {
ClearPreviousPic();
WebPDataClear(&kParams.data);
WebPDemuxReleaseIterator(&kParams.frameiter);
WebPDemuxDelete(kParams.dmux);
kParams.dmux = NULL;
}
//------------------------------------------------------------------------------
// 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
ClearParams();
exit(0);
#endif
} else if (key == 'i') {
kParams.print_info = 1 - kParams.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 float GetColorf(uint32_t color, int shift) {
return (color >> shift) / 255.f;
}
static void DrawCheckerBoard(void) {
const int square_size = 8; // must be a power of 2
int x, y;
GLint viewport[4]; // x, y, width, height
glPushMatrix();
glGetIntegerv(GL_VIEWPORT, viewport);
// shift to integer coordinates with (0,0) being top-left.
glOrtho(0, viewport[2], viewport[3], 0, -1, 1);
for (y = 0; y < viewport[3]; y += square_size) {
for (x = 0; x < viewport[2]; x += square_size) {
const GLubyte color = 128 + 64 * (!((x + y) & square_size));
glColor3ub(color, color, color);
glRecti(x, y, x + square_size, y + square_size);
}
}
glPopMatrix();
}
static void HandleDisplay(void) {
const WebPDecBuffer* const pic = kParams.pic;
const WebPIterator* const iter = &kParams.frameiter;
GLfloat xoff, yoff;
if (pic == NULL) return;
glPushMatrix();
glPixelZoom(1, -1);
xoff = (GLfloat)(2. * iter->x_offset / kParams.canvas_width);
yoff = (GLfloat)(2. * iter->y_offset / kParams.canvas_height);
glRasterPos2f(-1. + xoff, 1. - yoff);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_ROW_LENGTH, pic->u.RGBA.stride / 4);
if (iter->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
glClear(GL_COLOR_BUFFER_BIT); // use clear color
}
glDrawPixels(pic->width, pic->height,
GL_RGBA, GL_UNSIGNED_BYTE,
(GLvoid*)pic->u.RGBA.rgba);
if (kParams.print_info) {
char tmp[32];
glColor4f(0.90, 0.0, 0.90, 1.0);
glRasterPos2f(-0.95f, 0.90f);
PrintString(kParams.file_name);
snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", pic->width, pic->height);
glColor4f(0.90, 0.0, 0.90, 1.0);
glRasterPos2f(-0.95f, 0.80f);
PrintString(tmp);
if (iter->x_offset != 0 || iter->y_offset != 0) {
snprintf(tmp, sizeof(tmp), " (offset:%d,%d)",
iter->x_offset, iter->y_offset);
glRasterPos2f(-0.95f, 0.70f);
PrintString(tmp);
}
}
glPopMatrix();
glFlush();
}
static void StartDisplay(void) {
const int width = kParams.canvas_width;
const int height = kParams.canvas_height;
glutInitDisplayMode(GLUT_RGBA);
glutInitWindowSize(width, height);
glutCreateWindow("WebP viewer");
glutDisplayFunc(HandleDisplay);
glutIdleFunc(NULL);
glutKeyboardFunc(HandleKey);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glClearColor(GetColorf(kParams.bg_color, 0),
GetColorf(kParams.bg_color, 8),
GetColorf(kParams.bg_color, 16),
GetColorf(kParams.bg_color, 24));
HandleReshape(width, height);
glClear(GL_COLOR_BUFFER_BIT);
DrawCheckerBoard();
}
//------------------------------------------------------------------------------
// File decoding
static int Decode(void) { // Fills kParams.frameiter
const WebPIterator* const iter = &kParams.frameiter;
WebPDecoderConfig* const config = kParams.config;
WebPDecBuffer* const output_buffer = &config->output;
int ok = 0;
ClearPreviousPic();
output_buffer->colorspace = MODE_RGBA;
ok = (WebPDecode(iter->fragment.bytes, iter->fragment.size,
config) == VP8_STATUS_OK);
if (!ok) {
fprintf(stderr, "Decoding of frame #%d failed!\n", iter->frame_num);
} else {
kParams.pic = output_buffer;
}
return ok;
}
static void decode_callback(int what) {
if (what == 0 && !kParams.done) {
int duration = 0;
if (kParams.dmux != NULL) {
WebPIterator* const iter = &kParams.frameiter;
if (!WebPDemuxNextFrame(iter)) {
WebPDemuxReleaseIterator(iter);
if (WebPDemuxGetFrame(kParams.dmux, 1, iter)) {
--kParams.loop_count;
kParams.done = (kParams.loop_count == 0);
} else {
kParams.decoding_error = 1;
kParams.done = 1;
return;
}
}
duration = iter->duration;
}
if (!Decode()) {
kParams.decoding_error = 1;
kParams.done = 1;
} else {
glutPostRedisplay();
glutTimerFunc(duration, decode_callback, what);
}
}
}
//------------------------------------------------------------------------------
// 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"
" -info ........ print info.\n"
" -h ....... this help message.\n"
"\n"
"Keyboard shortcuts:\n"
" 'i' ................ overlay file information.\n"
" 'q' / 'Q' / ESC .... quit.\n"
);
}
int main(int argc, char *argv[]) {
WebPDecoderConfig config;
int c;
if (!WebPInitDecoderConfig(&config)) {
fprintf(stderr, "Library version mismatch!\n");
return -1;
}
kParams.config = &config;
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], "-info")) {
kParams.print_info = 1;
} else if (!strcmp(argv[c], "-version")) {
const int dec_version = WebPGetDecoderVersion();
const int dmux_version = WebPGetDemuxVersion();
printf("WebP Decoder version: %d.%d.%d\nWebP Demux version: %d.%d.%d\n",
(dec_version >> 16) & 0xff, (dec_version >> 8) & 0xff,
dec_version & 0xff, (dmux_version >> 16) & 0xff,
(dmux_version >> 8) & 0xff, dmux_version & 0xff);
return 0;
} else if (!strcmp(argv[c], "-mt")) {
config.options.use_threads = 1;
} else if (argv[c][0] == '-') {
printf("Unknown option '%s'\n", argv[c]);
Help();
return -1;
} else {
kParams.file_name = argv[c];
}
}
if (kParams.file_name == NULL) {
printf("missing input file!!\n");
Help();
return 0;
}
if (!ExUtilReadFile(kParams.file_name,
&kParams.data.bytes, &kParams.data.size)) {
goto Error;
}
kParams.dmux = WebPDemux(&kParams.data);
if (kParams.dmux == NULL) {
fprintf(stderr, "Could not create demuxing object!\n");
goto Error;
}
if (WebPDemuxGetI(kParams.dmux, WEBP_FF_FORMAT_FLAGS) & FRAGMENTS_FLAG) {
fprintf(stderr, "Image fragments are not supported for now!\n");
goto Error;
}
kParams.canvas_width = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_WIDTH);
kParams.canvas_height = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_HEIGHT);
if (kParams.print_info) {
printf("Canvas: %d x %d\n", kParams.canvas_width, kParams.canvas_height);
}
if (!WebPDemuxGetFrame(kParams.dmux, 1, &kParams.frameiter)) goto Error;
kParams.has_animation = (kParams.frameiter.num_frames > 1);
kParams.loop_count = (int)WebPDemuxGetI(kParams.dmux, WEBP_FF_LOOP_COUNT);
kParams.bg_color = WebPDemuxGetI(kParams.dmux, WEBP_FF_BACKGROUND_COLOR);
printf("VP8X: Found %d images in file (loop count = %d)\n",
kParams.frameiter.num_frames, kParams.loop_count);
// Decode first frame
if (!Decode()) goto Error;
// Position iterator to last frame. Next call to HandleDisplay will wrap over.
// We take this into account by bumping up loop_count.
WebPDemuxGetFrame(kParams.dmux, 0, &kParams.frameiter);
if (kParams.loop_count) ++kParams.loop_count;
// Start display (and timer)
glutInit(&argc, argv);
#ifdef FREEGLUT
glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION);
#endif
StartDisplay();
if (kParams.has_animation) glutTimerFunc(0, decode_callback, 0);
glutMainLoop();
// Should only be reached when using FREEGLUT:
ClearParams();
return 0;
Error:
ClearParams();
return -1;
}
//------------------------------------------------------------------------------