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

Set Alpha

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參考資訊：
1. libctru doc
2. 3ds-examples

說明：

API
int SDL_SetAlpha(SDL_Surface *surface, Uint32 flag, Uint8 alpha)

main.c

#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
#include <SDL_image.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, 0x00, 0xff, 0x00));

    SDL_Surface *png = IMG_Load("main.png");
    SDL_SetAlpha(screen, SDL_SRCALPHA, 128);
    SDL_BlitSurface(png, NULL, screen, NULL);
    SDL_Flip(screen);
    SDL_Delay(3000);

    SDL_FreeSurface(png);
    SDL_Quit();
    return 0;
}

完成

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