mirror of
https://github.com/webmproject/libwebp.git
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111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Simple WebP-to-SDL wrapper. Useful for emscripten.
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//
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// Author: James Zern (jzern@google.com)
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#ifdef HAVE_CONFIG_H
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#include "webp/config.h"
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#endif
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#if defined(WEBP_HAVE_SDL)
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#include "webp_to_sdl.h"
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#include <stdio.h>
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#include "webp/decode.h"
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#if defined(WEBP_HAVE_JUST_SDL_H)
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#include <SDL.h>
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#else
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#include <SDL/SDL.h>
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#endif
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static int init_ok = 0;
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int WebpToSDL(const char* data, unsigned int data_size) {
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int ok = 0;
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VP8StatusCode status;
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WebPDecoderConfig config;
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WebPBitstreamFeatures* const input = &config.input;
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WebPDecBuffer* const output = &config.output;
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SDL_Surface* screen = NULL;
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SDL_Surface* surface = NULL;
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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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if (!init_ok) {
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SDL_Init(SDL_INIT_VIDEO);
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init_ok = 1;
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}
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status = WebPGetFeatures((uint8_t*)data, (size_t)data_size, &config.input);
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if (status != VP8_STATUS_OK) goto Error;
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screen = SDL_SetVideoMode(input->width, input->height, 32, SDL_SWSURFACE);
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if (screen == NULL) {
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fprintf(stderr, "Unable to set video mode (32bpp %dx%d)!\n",
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input->width, input->height);
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goto Error;
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}
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surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
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input->width, input->height, 32,
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0x000000ffu, // R mask
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0x0000ff00u, // G mask
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0x00ff0000u, // B mask
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0xff000000u); // A mask
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if (surface == NULL) {
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fprintf(stderr, "Unable to create %dx%d RGBA surface!\n",
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input->width, input->height);
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goto Error;
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}
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if (SDL_MUSTLOCK(surface)) SDL_LockSurface(surface);
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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output->colorspace = MODE_BGRA;
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#else
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output->colorspace = MODE_RGBA;
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#endif
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output->width = surface->w;
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output->height = surface->h;
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output->u.RGBA.rgba = surface->pixels;
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output->u.RGBA.stride = surface->pitch;
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output->u.RGBA.size = surface->pitch * surface->h;
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output->is_external_memory = 1;
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status = WebPDecode((const uint8_t*)data, (size_t)data_size, &config);
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if (status != VP8_STATUS_OK) {
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fprintf(stderr, "Error decoding image (%d)\n", status);
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goto Error;
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}
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if (SDL_MUSTLOCK(surface)) SDL_UnlockSurface(surface);
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if (SDL_BlitSurface(surface, NULL, screen, NULL) ||
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SDL_Flip(screen)) {
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goto Error;
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}
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ok = 1;
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Error:
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SDL_FreeSurface(surface);
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SDL_FreeSurface(screen);
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WebPFreeDecBuffer(output);
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return ok;
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}
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//------------------------------------------------------------------------------
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#endif // WEBP_HAVE_SDL
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