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// 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 <SDL2/SDL.h>
#endif
static int init_ok = 0;
int WebPToSDL(const char* data, unsigned int data_size) {
int ok = 0;
VP8StatusCode status;
WebPBitstreamFeatures input;
uint8_t* output = NULL;
SDL_Window* window = NULL;
SDL_Renderer* renderer = NULL;
SDL_Texture* texture = NULL;
int width, height;
if (!init_ok) {
SDL_Init(SDL_INIT_VIDEO);
init_ok = 1;
}
status = WebPGetFeatures((uint8_t*)data, (size_t)data_size, &input);
if (status != VP8_STATUS_OK) goto Error;
width = input.width;
height = input.height;
SDL_CreateWindowAndRenderer(width, height, 0, &window, &renderer);
if (window == NULL || renderer == NULL) {
fprintf(stderr, "Unable to create window or renderer!\n");
goto Error;
}
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY,
"linear"); // make the scaled rendering look smoother.
SDL_RenderSetLogicalSize(renderer, width, height);
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ABGR8888,
SDL_TEXTUREACCESS_STREAMING, width, height);
if (texture == NULL) {
fprintf(stderr, "Unable to create %dx%d RGBA texture!\n", width, height);
goto Error;
}
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
output = WebPDecodeBGRA((const uint8_t*)data, (size_t)data_size, &width,
&height);
#else
output = WebPDecodeRGBA((const uint8_t*)data, (size_t)data_size, &width,
&height);
#endif
if (output == NULL) {
fprintf(stderr, "Error decoding image (%d)\n", status);
goto Error;
}
SDL_UpdateTexture(texture, NULL, output, width * sizeof(uint32_t));
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
ok = 1;
Error:
// We should call SDL_DestroyWindow(window) but that makes .js fail.
SDL_DestroyRenderer(renderer);
SDL_DestroyTexture(texture);
WebPFree(output);
return ok;
}
//------------------------------------------------------------------------------
#endif // WEBP_HAVE_SDL
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