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vwebp_sdl: simple viewer based on SDL

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Uses WebPToSDL() generic function defined in vwebp_sdl.[ch].
This function is not included in the libextras library, because it
would bring in an SDL dependency. Probably too heavy for now.

WebPToSDL() is separate, because it will be called used by the javascript
version of libwebp (through emscripten build rules)

Change-Id: Ic85b36f8ce4784f46023656278f6480be6802834
This commit is contained in:
Pascal Massimino
2017-01-30 13:33:35 +01:00
parent 84cef16f47
commit 6524fcd614
7 changed files with 288 additions and 5 deletions
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105
extras/webp_to_sdl.c Executable file
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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 "webp/config.h"
#endif
#if defined(WEBP_HAVE_SDL)
#include "webp_to_sdl.h"
#include <stdio.h>
#include "webp/decode.h"
#if defined(WEBP_HAVE_JUST_SDL_H)
#include <SDL.h>
#else
#include <SDL/SDL.h>
#endif
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;
}
SDL_Init(SDL_INIT_VIDEO);
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_FillRect(screen, &screen->clip_rect, 0xffffffff) ||
SDL_BlitSurface(surface, NULL, screen, NULL) ||
SDL_Flip(screen)) {
goto Error;
}
ok = 1;
Error:
SDL_FreeSurface(surface);
SDL_FreeSurface(screen);
return ok;
}
//------------------------------------------------------------------------------
#endif // WEBP_HAVE_SDL