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Logen Kain
2016-11-07 19:35:17 -07:00
parent 468b5dc71f
commit 8ce7637a0c
11 changed files with 345 additions and 0 deletions
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95
loki_sample/alpha-example/alpha-sdl.c Normal file
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/* Example of alpha blending with SDL. */
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
SDL_Surface *screen;
SDL_Surface *background;
SDL_Surface *image_with_alpha;
SDL_Surface *image_without_alpha;
SDL_Rect src, dest;
/* init sdl and check for erro */
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
printf("Unable to init SDL: %s\n", SDL_GetError());
return 1;
}
atexit(SDL_Quit);
screen = SDL_SetVideoMode(800, 600, 16, 0);
if (screen == NULL) {
printf("Unable to set video mode: %s\n", SDL_GetError());
return 1;
}
/* Load image file */
image_with_alpha = IMG_Load("with-alpha.png");
if (image_with_alpha == NULL) {
printf("Unable to load image. \n");
return 1;
}
image_without_alpha = IMG_Load("without-alpha.png");
if (image_without_alpha == NULL) {
printf("Unable to load image\n");
return 1;
}
background = IMG_Load("background.png");
if (background == NULL) {
printf("Unable to load background.png.\n");
return 1;
}
/* Draw background. */
src.x = 0;
src.y = 0;
src.w = background->w;
src.h = background->h;
dest.x = 0;
dest.y = 0;
dest.w = background->w;
dest.h = background->h;
SDL_BlitSurface(background, &src, screen, &dest);
/* draw first image with alpha */
SDL_SetAlpha(image_with_alpha, SDL_SRCALPHA, 0);
src.w = image_with_alpha->w;
src.h = image_with_alpha->h;
dest.w = src.w;
dest.h = src.h;
dest.x = 40;
dest.y = 50;
SDL_BlitSurface(image_with_alpha, &src, screen, &dest);
/* Draw second image without alpha. Set to 50% transparence for entire surface.
*/
SDL_SetAlpha(image_without_alpha, SDL_SRCALPHA, 128);
src.w = image_without_alpha->w;
src.h = image_without_alpha->h;
dest.w = src.w;
dest.h = src.h;
dest.x = 180;
dest.y = 50;
SDL_BlitSurface(image_without_alpha, &src, screen, &dest);
/* Ask SDL to update entire screen */
SDL_UpdateRect(screen, 0, 0, 0, 0);
SDL_Delay(10000);
/* Free memory */
SDL_FreeSurface(background);
SDL_FreeSurface(image_with_alpha);
SDL_FreeSurface(image_without_alpha);
return 0;
}