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use proper linear filtering for image scaling

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This commit is contained in:
Sebastian Krzyszkowiak 2012-03-03 21:09:49 +01:00
parent d9dd10d063
commit 3828f4136b
2 changed files with 31 additions and 4 deletions
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4
src/loading.c
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@ -79,8 +79,8 @@ void Loading_Load(struct Game *game) {
else al_draw_bitmap(game->loading.image, 0, 0, 0);
} else GenerateLoadingBitmap();
*/
game->loading.image = al_load_bitmap( "data/loading.png");
//game->loading.image = LoadFromCache(game, "loading.png", al_get_display_width(game->display), al_get_display_height(game->display));
//game->loading.image = al_load_bitmap( "data/loading.png");
game->loading.image = LoadFromCache(game, "loading.png", al_get_display_width(game->display), al_get_display_height(game->display));
// Scale "Loading" bitmap
al_set_target_bitmap(game->loading.loading_bitmap);

29
src/main.c
View file

@ -5,6 +5,7 @@
*/
#include <stdio.h>
#include <math.h>
#include "menu.h"
#include "loading.h"
#include "about.h"
@ -154,7 +155,33 @@ void ScaleBitmap(ALLEGRO_BITMAP* source, int width, int height, float val) {
int x, y;
al_lock_bitmap(al_get_target_bitmap(), ALLEGRO_PIXEL_FORMAT_ANY, ALLEGRO_LOCK_WRITEONLY);
al_lock_bitmap(source, ALLEGRO_PIXEL_FORMAT_ANY, ALLEGRO_LOCK_READONLY);
ALLEGRO_COLOR interpolate(ALLEGRO_COLOR c1, ALLEGRO_COLOR c2, float frac) {
return al_map_rgba_f(c1.r + frac * (c2.r - c1.r),
c1.g + frac * (c2.g - c1.g),
c1.b + frac * (c2.b - c1.b),
c1.a + frac * (c2.a - c1.a));
}
for (y = 0; y < height; y++) {
float pixy = ((float)y / height) * ((float)al_get_bitmap_height(source) - 1);
float pixy_f = floor(pixy);
for (x = 0; x < width; x++) {
float pixx = ((float)x / width) * ((float)al_get_bitmap_width(source) - 1);
float pixx_f = floor(pixx);
ALLEGRO_COLOR a = al_get_pixel(source, pixx_f, pixy_f);
ALLEGRO_COLOR b = al_get_pixel(source, pixx_f + 1, pixy_f);
ALLEGRO_COLOR c = al_get_pixel(source, pixx_f, pixy_f + 1);
ALLEGRO_COLOR d = al_get_pixel(source, pixx_f + 1, pixy_f + 1);
ALLEGRO_COLOR ab = interpolate(a, b, pixx - pixx_f);
ALLEGRO_COLOR cd = interpolate(c, d, pixx - pixx_f);
ALLEGRO_COLOR result = interpolate(ab, cd, pixy - pixy_f);
al_put_pixel(x, y, result);
}
/*
float pixy = ((float)y / height) * al_get_bitmap_height(source);
for (x = 0; x < width; x++) {
float pixx = ((float)x / width) * al_get_bitmap_width(source);
@ -169,7 +196,7 @@ void ScaleBitmap(ALLEGRO_BITMAP* source, int width, int height, float val) {
(a.a+b.a+c.a+d.a) / 4
);
al_put_pixel(x, y, result);
}
}*/
}
al_unlock_bitmap(al_get_target_bitmap());
al_unlock_bitmap(source);