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Ensure pixel coordinates are within bounds

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Abdelrahman Said 2024-08-18 15:14:01 +01:00
parent 6d6d4781ff
commit 6c275baa20
1 changed files with 16 additions and 4 deletions
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20
src/img.c
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@ -7,7 +7,7 @@
#include <stddef.h>
#include <string.h>
internal u64 calculate_pixel_index(Buffer *buffer, u64 x, u64 y, u64 base_size);
internal i64 calculate_pixel_index(Buffer *buffer, u64 x, u64 y, u64 base_size);
bool _init_buffer(Arena *arena, Buffer *buffer, u64 base_size) {
if (!arena || !buffer || buffer->width == 0 || buffer->height == 0) {
@ -21,12 +21,20 @@ bool _init_buffer(Arena *arena, Buffer *buffer, u64 base_size) {
}
u8 *_get_pixel(Buffer *buffer, u64 x, u64 y, u64 base_size) {
u64 idx = calculate_pixel_index(buffer, x, y, base_size);
i64 idx = calculate_pixel_index(buffer, x, y, base_size);
if (idx == -1) {
idx = 0;
}
return ((u8 *)(buffer->buf)) + idx;
}
void _set_pixel(Buffer *buffer, u64 x, u64 y, void *value, u64 base_size) {
u64 idx = calculate_pixel_index(buffer, x, y, base_size);
i64 idx = calculate_pixel_index(buffer, x, y, base_size);
if (idx == -1) {
return;
}
memcpy(((u8 *)(buffer->buf)) + idx, value, base_size);
return;
}
@ -75,7 +83,11 @@ void save_image(const Image *img, const char *filename) {
write_p7_image(img->width, img->height, (u8 *)(img->buf), filename);
}
internal u64 calculate_pixel_index(Buffer *buffer, u64 x, u64 y,
internal i64 calculate_pixel_index(Buffer *buffer, u64 x, u64 y,
u64 base_size) {
if (x < 0 || y < 0 || x >= buffer->width || y >= buffer->height) {
return -1;
}
return (y * buffer->width + x) * base_size;
}