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add helper function to compute pixel indices

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This commit is contained in:
Bruno BELANYI 2020-11-10 17:39:00 +01:00
parent ba11946be5
commit 86f8f4fec9
3 changed files with 6 additions and 2 deletions
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4
src/image.h
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@ -16,4 +16,8 @@ struct image {
struct image *create_image(size_t w, size_t h);
void destroy_image(struct image *image);
static inline size_t to_index(size_t h, size_t w, const struct image *image) {
return h * image->w + w;
}
#endif /* !IMAGE_H */

2
src/main.c
View file

@ -9,7 +9,7 @@
static void fill_image(struct image *image) {
for (size_t i = 0; i < image->h; ++i) {
for (size_t j = 0; j < image->w; ++j) {
struct pixel *p = &image->buf[i * image->w + j];
struct pixel *p = &image->buf[to_index(i, j, image)];
p->r = 255 * i / image->h;
p->g = 255 * j / image->w;
p->g = 255 * (i + j) / (image->h + image->w);

2
src/ppm.c
View file

@ -14,7 +14,7 @@ void print_ppm(const struct image *image, FILE *f) {
for (size_t j = 0; j < image->w; ++j) {
if (j != 0)
fputc(' ', f);
const struct pixel *p = &image->buf[i * image->w + j];
const struct pixel *p = &image->buf[to_index(i, j, image)];
fprintf(f, "%hhu %hhu %hhu", p->r, p->g, p->b);
}
fputc('\n', f);