Correctly bind max width and height values when using withoutEnlargem…

…ent (#2024)

package.json

@@ -64,7 +64,8 @@
     "Ilya Ovdin <iovdin@gmail.com>",
     "Andargor <andargor@yahoo.com>",
     "Paul Neave <paul.neave@gmail.com>",
-    "Brendan Kennedy <brenwken@gmail.com>"
+    "Brendan Kennedy <brenwken@gmail.com>",
+    "Brychan Bennett-Odlum <git@brychan.io>"
   ],
   "scripts": {
     "install": "(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)",

src/pipeline.cc

@@ -134,6 +134,17 @@ class PipelineWorker : public Nan::AsyncWorker {
         std::swap(inputWidth, inputHeight);
       }
 
+      // If withoutEnlargement is specified,
+      // Override target width and height if exceeds respective value from input file
+      if (baton->withoutEnlargement) {
+        if (baton->width > inputWidth) {
+          baton->width = inputWidth;
+        }
+        if (baton->height > inputHeight) {
+          baton->height = inputHeight;
+        }
+      }
+
       // Scaling calculations
       double xfactor = 1.0;
       double yfactor = 1.0;
@@ -221,21 +232,6 @@ class PipelineWorker : public Nan::AsyncWorker {
       double xresidual = static_cast<double>(xshrink) / xfactor;
       double yresidual = static_cast<double>(yshrink) / yfactor;
 
-      // Do not enlarge the output if the input width *or* height
-      // are already less than the required dimensions
-      if (baton->withoutEnlargement) {
-        if (inputWidth < baton->width || inputHeight < baton->height) {
-          xfactor = 1.0;
-          yfactor = 1.0;
-          xshrink = 1;
-          yshrink = 1;
-          xresidual = 1.0;
-          yresidual = 1.0;
-          baton->width = inputWidth;
-          baton->height = inputHeight;
-        }
-      }
-
       // If integral x and y shrink are equal, try to use shrink-on-load for JPEG and WebP,
       // but not when applying gamma correction, pre-resize extract or trim
       int shrink_on_load = 1;

test/unit/resize.js

@@ -307,6 +307,40 @@ describe('Resize dimensions', function () {
       });
   });
 
+  it('Do crop when fit = cover and withoutEnlargement = true and width >= outputWidth, and height < outputHeight', function (done) {
+    sharp(fixtures.inputJpg)
+      .resize({
+        width: 3000,
+        height: 1000,
+        withoutEnlargement: true
+      })
+      .toBuffer(function (err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(true, data.length > 0);
+        assert.strictEqual('jpeg', info.format);
+        assert.strictEqual(2725, info.width);
+        assert.strictEqual(1000, info.height);
+        done();
+      });
+  });
+
+  it('Do crop when fit = cover and withoutEnlargement = true and width < outputWidth, and height >= outputHeight', function (done) {
+    sharp(fixtures.inputJpg)
+      .resize({
+        width: 1500,
+        height: 2226,
+        withoutEnlargement: true
+      })
+      .toBuffer(function (err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(true, data.length > 0);
+        assert.strictEqual('jpeg', info.format);
+        assert.strictEqual(1500, info.width);
+        assert.strictEqual(2225, info.height);
+        done();
+      });
+  });
+
   it('Do enlarge when input width is less than output width', function (done) {
     sharp(fixtures.inputJpg)
       .resize({