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Perform per-line or per-rect blits in blit_rect.

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Rinnegatamante 2025-08-28 17:03:58 +02:00
parent 4ebf67c12d
commit ad09677532
1 changed files with 11 additions and 14 deletions
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25
core/io/image.cpp
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@ -2902,20 +2902,17 @@ void Image::blit_rect(const Ref<Image> &p_src, const Rect2i &p_src_rect, const P
int pixel_size = get_format_pixel_size(format);
for (int i = 0; i < dest_rect.size.y; i++) {
for (int j = 0; j < dest_rect.size.x; j++) {
int src_x = src_rect.position.x + j;
int src_y = src_rect.position.y + i;
int dst_x = dest_rect.position.x + j;
int dst_y = dest_rect.position.y + i;
const uint8_t *src = &src_data_ptr[(src_y * p_src->width + src_x) * pixel_size];
uint8_t *dst = &dst_data_ptr[(dst_y * width + dst_x) * pixel_size];
for (int k = 0; k < pixel_size; k++) {
dst[k] = src[k];
}
// If the rect width is equivalent for both src and dst and the x offset is 0, we can blit in a single memcpy.
// Else, we do a per-line copy.
if ((dest_rect.size.x == p_src->width) && (p_src->width == width) && (dest_rect.position.x == 0) && (src_rect.position.x == 0)) {
const uint8_t *src = &src_data_ptr[(src_rect.position.y * p_src->width) * pixel_size];
uint8_t *dst = &dst_data_ptr[(dest_rect.position.y * width) * pixel_size];
memcpy(dst, src, width * dest_rect.size.y * pixel_size);
} else {
for (int i = 0; i < dest_rect.size.y; i++) {
const uint8_t *src = &src_data_ptr[((src_rect.position.y + i) * p_src->width + src_rect.position.x) * pixel_size];
uint8_t *dst = &dst_data_ptr[((dest_rect.position.y + i) * width + dest_rect.position.x) * pixel_size];
memcpy(dst, src, pixel_size * dest_rect.size.x);
}
}
}