-shared_ptr<Image>
-Image::crop (Crop crop, bool aligned) const
-{
- dcp::Size cropped_size = crop.apply (size ());
- shared_ptr<Image> out (new Image (pixel_format(), cropped_size, aligned));
-
- for (int c = 0; c < components(); ++c) {
- int const crop_left_in_bytes = bytes_per_pixel(c) * crop.left;
- /* bytes_per_pixel() could be a fraction; in this case the stride will be rounded
- up, and we need to make sure that we copy over the width (up to the stride)
- rather than short of the width; hence the ceil() here.
- */
- int const cropped_width_in_bytes = ceil (bytes_per_pixel(c) * cropped_size.width);
-
- /* Start of the source line, cropped from the top but not the left */
- uint8_t* in_p = data()[c] + (crop.top / out->line_factor(c)) * stride()[c];
- uint8_t* out_p = out->data()[c];
-
- for (int y = 0; y < out->lines(c); ++y) {
- memcpy (out_p, in_p + crop_left_in_bytes, cropped_width_in_bytes);
- in_p += stride()[c];
- out_p += out->stride()[c];
- }
- }
-
- return out;
-}
-