/*
  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include "SDL.h"
#include "SDL_shape.h"

#define SHAPED_WINDOW_X 150
#define SHAPED_WINDOW_Y 150
#define SHAPED_WINDOW_DIMENSION 640

#define TICK_INTERVAL 1000/10

typedef struct LoadedPicture {
    SDL_Surface *surface;
    SDL_Texture *texture;
    SDL_WindowShapeMode mode;
} LoadedPicture;

void render(SDL_Renderer *renderer,SDL_Texture *texture,SDL_Rect texture_dimensions)
{
    //Clear render-target to blue.
    SDL_SetRenderDrawColor(renderer,0x00,0x00,0xff,0xff);
    SDL_RenderClear(renderer);

    //Render the texture.
    SDL_RenderCopy(renderer,texture,&texture_dimensions,&texture_dimensions);

    SDL_RenderPresent(renderer);
}

static Uint32 next_time;

Uint32 time_left()
{
    Uint32 now = SDL_GetTicks();
    if(next_time <= now)
        return 0;
    else
        return next_time - now;
}

int main(int argc,char** argv)
{
    Uint8 num_pictures;
    LoadedPicture* pictures;
    int i, j;
    SDL_PixelFormat* format = NULL;
    SDL_Window *window;
    SDL_Renderer *renderer;
    SDL_Color black = {0,0,0,0xff};
    SDL_Event event;
    int event_pending = 0;
    int should_exit = 0;
    unsigned int current_picture;
    int button_down;
    Uint32 pixelFormat = 0;
    int access = 0;
    SDL_Rect texture_dimensions;;

    if(argc < 2) {
        printf("SDL_Shape requires at least one bitmap file as argument.\n");
        exit(-1);
    }

    if(SDL_VideoInit(NULL) == -1) {
        printf("Could not initialize SDL video.\n");
        exit(-2);
    }

    num_pictures = argc - 1;
    pictures = (LoadedPicture *)SDL_malloc(sizeof(LoadedPicture)*num_pictures);
    for(i=0;i<num_pictures;i++)
        pictures[i].surface = NULL;
    for(i=0;i<num_pictures;i++) {
        pictures[i].surface = SDL_LoadBMP(argv[i+1]);
        if(pictures[i].surface == NULL) {
            j = 0;
            for(j=0;j<num_pictures;j++)
                if(pictures[j].surface != NULL)
                    SDL_FreeSurface(pictures[j].surface);
            SDL_free(pictures);
            SDL_VideoQuit();
            printf("Could not load surface from named bitmap file.\n");
            exit(-3);
        }

        format = pictures[i].surface->format;
        if(format->Amask != 0) {
            pictures[i].mode.mode = ShapeModeBinarizeAlpha;
            pictures[i].mode.parameters.binarizationCutoff = 255;
        }
        else {
            pictures[i].mode.mode = ShapeModeColorKey;
            pictures[i].mode.parameters.colorKey = black;
        }
    }

    window = SDL_CreateShapedWindow("SDL_Shape test",SHAPED_WINDOW_X,SHAPED_WINDOW_Y,SHAPED_WINDOW_DIMENSION,SHAPED_WINDOW_DIMENSION,SDL_WINDOW_RESIZABLE);
    if(window == NULL) {
        for(i=0;i<num_pictures;i++)
            SDL_FreeSurface(pictures[i].surface);
        SDL_free(pictures);
        SDL_VideoQuit();
        printf("Could not create shaped window for SDL_Shape.\n");
        exit(-4);
    }
    renderer = SDL_CreateRenderer(window,-1,0);
    if (!renderer) {
        SDL_DestroyWindow(window);
        for(i=0;i<num_pictures;i++)
            SDL_FreeSurface(pictures[i].surface);
        SDL_free(pictures);
        SDL_VideoQuit();
        printf("Could not create rendering context for SDL_Shape window.\n");
        exit(-5);
    }

    for(i=0;i<num_pictures;i++)
        pictures[i].texture = NULL;
    for(i=0;i<num_pictures;i++) {
        pictures[i].texture = SDL_CreateTextureFromSurface(renderer,pictures[i].surface);
        if(pictures[i].texture == NULL) {
            j = 0;
            for(j=0;j<num_pictures;i++)
                if(pictures[i].texture != NULL)
                    SDL_DestroyTexture(pictures[i].texture);
            for(i=0;i<num_pictures;i++)
                SDL_FreeSurface(pictures[i].surface);
            SDL_free(pictures);
            SDL_DestroyRenderer(renderer);
            SDL_DestroyWindow(window);
            SDL_VideoQuit();
            printf("Could not create texture for SDL_shape.\n");
            exit(-6);
        }
    }

    event_pending = 0;
    should_exit = 0;
    event_pending = SDL_PollEvent(&event);
    current_picture = 0;
    button_down = 0;
    texture_dimensions.h = 0;
    texture_dimensions.w = 0;
    texture_dimensions.x = 0;
    texture_dimensions.y = 0;
    SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
    SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
    SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
    next_time = SDL_GetTicks() + TICK_INTERVAL;
    while(should_exit == 0) {
        event_pending = SDL_PollEvent(&event);
        if(event_pending == 1) {
            if(event.type == SDL_KEYDOWN) {
                button_down = 1;
                if(event.key.keysym.sym == SDLK_ESCAPE)
                    should_exit = 1;
            }
            if(button_down && event.type == SDL_KEYUP) {
                button_down = 0;
                current_picture += 1;
                if(current_picture >= num_pictures)
                    current_picture = 0;
                SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
                SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
                SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
            }
            if(event.type == SDL_QUIT)
                should_exit = 1;
            event_pending = 0;
        }
        render(renderer,pictures[current_picture].texture,texture_dimensions);
        SDL_Delay(time_left());
        next_time += TICK_INTERVAL;
    }

    //Free the textures.
    for(i=0;i<num_pictures;i++)
        SDL_DestroyTexture(pictures[i].texture);
    SDL_DestroyRenderer(renderer);
    //Destroy the window.
    SDL_DestroyWindow(window);
    //Free the original surfaces backing the textures.
    for(i=0;i<num_pictures;i++)
        SDL_FreeSurface(pictures[i].surface);
    SDL_free(pictures);
    //Call SDL_VideoQuit() before quitting.
    SDL_VideoQuit();

    return 0;
}

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