mirror of
https://github.com/webmproject/libwebp.git
synced 2024-11-20 04:18:26 +01:00
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
// Copyright 2017 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.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// Simple WebP-to-SDL wrapper. Useful for emscripten.
|
|
//
|
|
// Author: James Zern (jzern@google.com)
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "src/webp/config.h"
|
|
#endif
|
|
|
|
#if defined(WEBP_HAVE_SDL)
|
|
|
|
#include "webp_to_sdl.h"
|
|
|
|
#include <stdio.h>
|
|
#include "src/webp/decode.h"
|
|
|
|
#if defined(WEBP_HAVE_JUST_SDL_H)
|
|
#include <SDL.h>
|
|
#else
|
|
#include <SDL/SDL.h>
|
|
#endif
|
|
|
|
static int init_ok = 0;
|
|
int WebpToSDL(const char* data, unsigned int data_size) {
|
|
int ok = 0;
|
|
VP8StatusCode status;
|
|
WebPDecoderConfig config;
|
|
WebPBitstreamFeatures* const input = &config.input;
|
|
WebPDecBuffer* const output = &config.output;
|
|
SDL_Surface* screen = NULL;
|
|
SDL_Surface* surface = NULL;
|
|
|
|
if (!WebPInitDecoderConfig(&config)) {
|
|
fprintf(stderr, "Library version mismatch!\n");
|
|
return 1;
|
|
}
|
|
|
|
if (!init_ok) {
|
|
SDL_Init(SDL_INIT_VIDEO);
|
|
init_ok = 1;
|
|
}
|
|
|
|
status = WebPGetFeatures((uint8_t*)data, (size_t)data_size, &config.input);
|
|
if (status != VP8_STATUS_OK) goto Error;
|
|
|
|
screen = SDL_SetVideoMode(input->width, input->height, 32, SDL_SWSURFACE);
|
|
if (screen == NULL) {
|
|
fprintf(stderr, "Unable to set video mode (32bpp %dx%d)!\n",
|
|
input->width, input->height);
|
|
goto Error;
|
|
}
|
|
|
|
surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
|
|
input->width, input->height, 32,
|
|
0x000000ffu, // R mask
|
|
0x0000ff00u, // G mask
|
|
0x00ff0000u, // B mask
|
|
0xff000000u); // A mask
|
|
|
|
if (surface == NULL) {
|
|
fprintf(stderr, "Unable to create %dx%d RGBA surface!\n",
|
|
input->width, input->height);
|
|
goto Error;
|
|
}
|
|
if (SDL_MUSTLOCK(surface)) SDL_LockSurface(surface);
|
|
|
|
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
|
|
output->colorspace = MODE_BGRA;
|
|
#else
|
|
output->colorspace = MODE_RGBA;
|
|
#endif
|
|
output->width = surface->w;
|
|
output->height = surface->h;
|
|
output->u.RGBA.rgba = surface->pixels;
|
|
output->u.RGBA.stride = surface->pitch;
|
|
output->u.RGBA.size = surface->pitch * surface->h;
|
|
output->is_external_memory = 1;
|
|
|
|
status = WebPDecode((const uint8_t*)data, (size_t)data_size, &config);
|
|
if (status != VP8_STATUS_OK) {
|
|
fprintf(stderr, "Error decoding image (%d)\n", status);
|
|
goto Error;
|
|
}
|
|
|
|
if (SDL_MUSTLOCK(surface)) SDL_UnlockSurface(surface);
|
|
if (SDL_BlitSurface(surface, NULL, screen, NULL) ||
|
|
SDL_Flip(screen)) {
|
|
goto Error;
|
|
}
|
|
|
|
ok = 1;
|
|
|
|
Error:
|
|
SDL_FreeSurface(surface);
|
|
SDL_FreeSurface(screen);
|
|
WebPFreeDecBuffer(output);
|
|
return ok;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
#endif // WEBP_HAVE_SDL
|