GifAnimate.cpp

/*
 * This source file is part of RmlUi, the HTML/CSS Interface Middleware
 *
 * For the latest information, see http://github.com/mikke89/RmlUi
 *
 * Copyright (c) 2008-2010 Nuno Silva
 * Copyright (c) 2019 The RmlUi Team, and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include "GifAnimate.h"
#include "FileInterface.h"

bool LoadGifAnimation(SDL_Renderer* renderer, const Rml::String& source, Rml::TextureHandle& texture_handle, Rml::Vector2i& texture_dimensions) 
{
    size_t i;
    for (i = source.length() - 1; i > 0; i--)
    {
        if (source[i] == '.')
            break;
    }
    Rml::String extension = source.substr(i + 1, source.length() - i);
    if (extension == "gif") 
    {
        GifData gif_data;
        gif_data.anim = IMG_LoadAnimation( (FileInterface::mRoot + source).c_str() );
        if (!gif_data.anim) 
        {
            printf("Couldn't load %s: %s\n", (FileInterface::mRoot + source).c_str(), SDL_GetError());
            return false;
        }

        gif_data.textures = (SDL_Texture**)SDL_calloc(gif_data.anim->count, sizeof(*gif_data.textures));
        if (!gif_data.textures) {
            printf("Couldn't allocate textures\n");
            IMG_FreeAnimation(gif_data.anim);
            return false;
        }

        for (int n = 0; n < gif_data.anim->count; ++n) 
        {
            gif_data.textures[n] = SDL_CreateTextureFromSurface(renderer, gif_data.anim->frames[n]);
        }
        texture_handle = (Rml::TextureHandle)gif_data.textures[0];
        texture_dimensions = Rml::Vector2i(gif_data.anim->w, gif_data.anim->h);
        gif_data.current_frame = 0;
        gif_data.lastTime = 0;
        gif_data.currentTime = 0;
        gif_data.delay = 1000;
        gif_map[texture_handle] = gif_data;
        return true;
    }
    return false;
}

SDL_Texture* GetGifAnimation(const Rml::TextureHandle texture) 
{
    if (gif_map.find(texture) != gif_map.end()) 
    {
        GifData* g = &gif_map[texture];
        SDL_Texture* sdl_texture = (SDL_Texture*)g->textures[g->current_frame];
        g->delay = g->anim->delays[g->current_frame];
        g->currentTime = SDL_GetTicks();  //FIXME: USE SDL_GetTicks64 if avalable

        if (g->currentTime > g->lastTime + g->delay) 
        {
            g->lastTime = g->currentTime;
            g->current_frame = (g->current_frame + 1) % g->anim->count;
        }
        return sdl_texture;
    }
    
    return nullptr; //(SDL_Texture*)rml_textureHandle;
}