Fix (unrelated) memory leak discovered whilst investigating #6

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sharp",
-  "version": "0.1.2",
+  "version": "0.1.4",
   "author": "Lovell Fuller",
   "description": "High performance module to resize JPEG and PNG images using the libvips image processing library",
   "scripts": {

src/sharp.cc

@@ -98,22 +98,21 @@ void resize_async(uv_work_t *work) {
   int shrink_on_load = 1;
   if (inputImageType == JPEG) {
     if (shrink >= 8) {
-      factor = residual * shrink / 8;
+      factor = factor / 8;
       shrink_on_load = 8;
-      shrink = floor(factor);
-      residual = shrink / factor;
     } else if (shrink >= 4) {
-      factor = residual * shrink / 4;
+      factor = factor / 4;
       shrink_on_load = 4;
-      shrink = floor(factor);
-      residual = shrink / factor;
     } else if (shrink >= 2) {
-      factor = residual * shrink / 2;
+      factor = factor / 2;
       shrink_on_load = 2;
-      shrink = floor(factor);
-      residual = shrink / factor;
     }
     if (shrink_on_load > 1) {
+      // Recalculate integral shrink and double residual
+      factor = std::max(factor, 1.0);
+      shrink = floor(factor);
+      residual = shrink / factor;
+      // Reload input using shrink-on-load 
       g_object_unref(in);
       in = vips_image_new();
       if (baton->buffer_in_len > 1) {
@@ -152,7 +151,7 @@ void resize_async(uv_work_t *work) {
 
   VipsImage *canvased = vips_image_new();
   if (affined->Xsize != baton->width || affined->Ysize != baton->height) {
-    if (baton->crop && affined->Xsize != baton->width && affined->Ysize != baton->height) {
+    if (baton->crop) {
       // Crop
       int width = std::min(affined->Xsize, baton->width);
       int height = std::min(affined->Ysize, baton->height);
@@ -192,28 +191,28 @@ void resize_async(uv_work_t *work) {
 
   if (baton->file_out == "__jpeg") {
     // Write JPEG to buffer
-    if (vips_jpegsave_buffer(canvased, &baton->buffer_out, &baton->buffer_out_len, "strip", TRUE, "Q", 80, "optimize_coding", TRUE, "interlace", baton->progessive, NULL)) {
-      return resize_error(baton, canvased);
+    if (vips_jpegsave_buffer(sharpened, &baton->buffer_out, &baton->buffer_out_len, "strip", TRUE, "Q", 80, "optimize_coding", TRUE, "interlace", baton->progessive, NULL)) {
+      return resize_error(baton, sharpened);
     }
   } else if (baton->file_out == "__png") {
     // Write PNG to buffer
-    if (vips_pngsave_buffer(canvased, &baton->buffer_out, &baton->buffer_out_len, "strip", TRUE, "compression", 6, "interlace", baton->progessive, NULL)) {
-      return resize_error(baton, canvased);
+    if (vips_pngsave_buffer(sharpened, &baton->buffer_out, &baton->buffer_out_len, "strip", TRUE, "compression", 6, "interlace", baton->progessive, NULL)) {
+      return resize_error(baton, sharpened);
     }
   } else if (is_jpeg(baton->file_out))  {
     // Write JPEG to file
-    if (vips_jpegsave(canvased, baton->file_out.c_str(), "strip", TRUE, "Q", 80, "optimize_coding", TRUE, "interlace", baton->progessive, NULL)) {
-      return resize_error(baton, canvased);
+    if (vips_jpegsave(sharpened, baton->file_out.c_str(), "strip", TRUE, "Q", 80, "optimize_coding", TRUE, "interlace", baton->progessive, NULL)) {
+      return resize_error(baton, sharpened);
     }
   } else if (is_png(baton->file_out)) {
     // Write PNG to file
-    if (vips_pngsave(canvased, baton->file_out.c_str(), "strip", TRUE, "compression", 6, "interlace", baton->progessive, NULL)) {
-      return resize_error(baton, canvased);
+    if (vips_pngsave(sharpened, baton->file_out.c_str(), "strip", TRUE, "compression", 6, "interlace", baton->progessive, NULL)) {
+      return resize_error(baton, sharpened);
     }
   } else {
     (baton->err).append("Unsupported output " + baton->file_out);
   }
-  g_object_unref(canvased);
+  g_object_unref(sharpened);
   vips_thread_shutdown();
 }