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67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include "images.h"
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int image_new(int width, int height, Image* img) {
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//Image img = malloc(sizeof(Image));
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if (img == NULL) return 0;
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img->height = height;
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img->width = width;
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// initialize bitmap...
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img->bitmap = malloc(height * sizeof(int*));
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for (int i = 0; i < height; i++) {
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img->bitmap[i] = malloc(3 * width * sizeof(int));
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}
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//*image = *img;
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return 1;
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}
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int image_set_px(Image image, int x, int y, int r, int g, int b) {
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if (!image_check_coords(image, x, y)) return 0;
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image.bitmap[y][(3 * x) + 0] = (char) r;
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image.bitmap[y][(3 * x) + 1] = (char) g;
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image.bitmap[y][(3 * x) + 2] = (char) b;
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return 1;
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}
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int image_set_px_c(Image image, int x, int y, Color color) {
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if (!image_check_coords(image, x, y)) return 0;
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if (color.alpha == 0) return 1;
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if (color.alpha == 1) {
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image.bitmap[y][(3 * x) + 0] = color.r;
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image.bitmap[y][(3 * x) + 1] = color.g;
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image.bitmap[y][(3 * x) + 2] = color.b;
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} else {
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//printf("adding %d to %f\n", (color.alpha * color.r), ((1.0f - color.alpha) * (image.bitmap[y][(3 * x) + 0]/* & 0x000000ff */)));
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image.bitmap[y][(3 * x) + 0] = (color.alpha * (color.r/* & 0x000000ff */)) + ((1.0f - color.alpha) * (image.bitmap[y][(3 * x) + 0]/* & 0x000000ff */));
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image.bitmap[y][(3 * x) + 1] = (color.alpha * (color.g/* & 0x000000ff */)) + ((1.0f - color.alpha) * (image.bitmap[y][(3 * x) + 1]/* & 0x000000ff */));
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image.bitmap[y][(3 * x) + 2] = (color.alpha * (color.b/* & 0x000000ff */)) + ((1.0f - color.alpha) * (image.bitmap[y][(3 * x) + 2]/* & 0x000000ff */));
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}
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return 1;
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}
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int image_check_coords(Image image, int x, int y) {
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return x >= 0 && x < image.width &&
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y >= 0 && y < image.height;
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}
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int image_destroy(Image image) {
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for (int i = 0; i < image.height; i++) {
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free(image.bitmap[i]);
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}
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free(image.bitmap);
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return 1;
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}
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