ref: d34dadbda7d4cf2433f1a0eadb84ba4c963ad324
parent: 7ea64ae21664e0752401a53dfda9b601691275a5
author: Sebastian Rasmussen <sebras@gmail.com>
date: Tue Apr 24 00:01:13 EDT 2018
jbig2dec: Implement support for resizing image width.
--- a/jbig2_image.c
+++ b/jbig2_image.c
@@ -130,8 +130,34 @@
image->height = height;
} else {- /* we must allocate a new image buffer and copy */
- jbig2_error(ctx, JBIG2_SEVERITY_WARNING, -1, "jbig2_image_resize called with a different width (NYI)");
+ Jbig2Image *newimage;
+ int code;
+
+ /* Unoptimized implementation, but it works. */
+
+ newimage = jbig2_image_new(ctx, width, height);
+ if (newimage == NULL) {+ jbig2_error(ctx, JBIG2_SEVERITY_WARNING, -1, "failed to allocate resized image");
+ return NULL;
+ }
+ jbig2_image_clear(ctx, newimage, value);
+
+ code = jbig2_image_compose(ctx, newimage, image, 0, 0, JBIG2_COMPOSE_REPLACE);
+ if (code < 0) {+ jbig2_error(ctx, JBIG2_SEVERITY_WARNING, -1, "failed to compose image buffers when resizing");
+ jbig2_image_release(ctx, newimage);
+ return NULL;
+ }
+
+ /* if refcount > 1 the original image, its pointer must
+ be kept, so simply replaces its innards, and throw away
+ the empty new image shell. */
+ jbig2_free(ctx->allocator, image->data);
+ image->width = newimage->width;
+ image->height = newimage->height;
+ image->stride = newimage->stride;
+ image->data = newimage->data;
+ jbig2_free(ctx->allocator, newimage);
}
return image;