+ return extension ? image_extension_to_format(extension + 1) : IMAGE_FORMAT_UNDEFINED;
+}
+
+struct image *
+image_io_read_data_prepare(struct image_io_read_data_internals *rdi, struct image_io *io, uns cols, uns rows, uns flags)
+{
+ DBG("image_io_read_data_prepare()");
+ if (rdi->need_transformations = io->cols != cols || io->rows != rows ||
+ ((io->flags ^ flags) & IMAGE_NEW_FLAGS))
+ return rdi->image = image_new(io->context, cols, rows, flags & IMAGE_IO_IMAGE_FLAGS, NULL);
+ else
+ return rdi->image = image_new(io->context, io->cols, io->rows, io->flags & IMAGE_IO_IMAGE_FLAGS, io->pool);
+}
+
+int
+image_io_read_data_finish(struct image_io_read_data_internals *rdi, struct image_io *io)
+{
+ DBG("image_io_read_data_finish()");
+ if (rdi->need_transformations)
+ {
+ /* Scale the image */
+ if (io->cols != rdi->image->cols || io->rows != rdi->image->rows)
+ {
+ DBG("Scaling image");
+ uns flags = rdi->image->flags;
+ if (!(rdi->need_transformations = ((io->flags ^ rdi->image->flags) & (IMAGE_NEW_FLAGS & ~IMAGE_PIXELS_ALIGNED))))
+ flags = io->flags;
+ struct image *img = image_new(io->context, io->cols, io->rows, flags, rdi->need_transformations ? NULL : io->pool);
+ if (unlikely(!img))
+ {
+ image_destroy(rdi->image);
+ return 0;
+ }
+ if (unlikely(!image_scale(io->context, img, rdi->image)))
+ {
+ image_destroy(rdi->image);
+ image_destroy(img);
+ return 0;
+ }
+ image_destroy(rdi->image);
+ rdi->image = img;
+ }
+
+ /* Merge with background */
+ if ((io->flags ^ rdi->image->flags) & IMAGE_ALPHA)
+ {
+ DBG("Applying background");
+ uns flags = rdi->image->flags & ~IMAGE_ALPHA;
+ if (!(rdi->need_transformations = (flags ^ io->flags) & (IMAGE_NEW_FLAGS & ~IMAGE_PIXELS_ALIGNED)))
+ flags = io->flags;
+ struct image *img = image_new(io->context, io->cols, io->rows, flags, rdi->need_transformations ? NULL : io->pool);
+ if (unlikely(!img))
+ {
+ image_destroy(rdi->image);
+ return 0;
+ }
+ if (unlikely(!image_apply_background(io->context, img, rdi->image, &io->background_color)))
+ {
+ image_destroy(rdi->image);
+ image_destroy(img);
+ return 0;
+ }
+ image_destroy(rdi->image);
+ rdi->image = img;
+ }
+
+ // FIXME: support for various color spaces
+
+ ASSERT(!rdi->need_transformations);
+ }
+
+ /* Success */
+ io->image = rdi->image;
+ return 1;
+}
+
+void
+image_io_read_data_break(struct image_io_read_data_internals *rdi, struct image_io *io UNUSED)
+{
+ DBG("image_io_read_data_break()");
+ if (rdi->image)
+ image_destroy(rdi->image);