Nintendo 3DS >> C/C++ >> SDL v1.2

Color Key

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參考資訊：
1. libctru doc
2. 3ds-examples

說明：

API
SDL_Surface *SDL_DisplayFormat(SDL_Surface *surface)
int SDL_SetColorKey(SDL_Surface *surface, int flag, Uint32 key)
Uint32 SDL_MapRGB(const SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b)

main.c

#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
 
int main(void)
{
    SDL_Surface *screen = NULL;

    SDL_Init(SDL_INIT_VIDEO);
    screen = SDL_SetVideoMode(400, 240, 16, SDL_HWSURFACE);
    SDL_FillRect(screen, &screen->clip_rect, SDL_MapRGB(screen->format, 0xff, 0x00, 0x00));

    SDL_Surface* bmp = SDL_LoadBMP("main.bmp");
    SDL_Surface *key = SDL_DisplayFormat(bmp);
    SDL_SetColorKey(key, SDL_SRCCOLORKEY, SDL_MapRGB(key->format, 0xff, 0xff, 0xff));

    SDL_BlitSurface(key, NULL, screen, NULL);
    SDL_Flip(screen);
    SDL_Delay(3000);

    SDL_FreeSurface(bmp);
    SDL_FreeSurface(key);
    SDL_Quit();
    return 0;
}

完成

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