chromeos: Fix pixelated icons in app list and launcher (part 1)

ui/gfx/image/image_skia_sources.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/gfx/image/image_skia_sources.h"

[pkotwicz, 2012/07/10 22:59:56]

Move this file here:
https://chromiumcodereview.appspot.com/10704113/diff/3018/ui/gfx/image/image_...

[xiyuan, 2012/07/11 17:39:13]

Done.

+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "skia/ext/image_operations.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/image/image_skia_rep.h"
+#include "ui/gfx/image/image_skia_source.h"
+#include "ui/gfx/size.h"
+#include "ui/gfx/skbitmap_operations.h"
+
+namespace gfx {
+namespace image_skia_sources {
+
+namespace {
+
+class ResizeSource : public ImageSkiaSource {
+ public:
+  ResizeSource(const ImageSkia& source,
+               const Size& target_dip_size)
+      : source_(source),
+        target_dip_size_(target_dip_size) {
+  }
+  virtual ~ResizeSource() {}
+
+ private:
+  // gfx::ImageSkiaSource overrides:
+  virtual ImageSkiaRep GetImageForScale(ui::ScaleFactor scale_factor) OVERRIDE {
+    const ImageSkiaRep& image_rep = source_.GetRepresentation(scale_factor);
+    if (image_rep.GetWidth() == target_dip_size_.width() &&
+        image_rep.GetHeight() == target_dip_size_.height())
+      return image_rep;
+
+    const float scale = image_rep.GetScale();;
+    const Size target_pixel_size(target_dip_size_.Scale(scale));
+    const SkBitmap resized = skia::ImageOperations::Resize(
+        image_rep.sk_bitmap(),
+        skia::ImageOperations::RESIZE_BEST,
+        target_pixel_size.width(),
+        target_pixel_size.height());
+    return ImageSkiaRep(resized, image_rep.scale_factor());
+  }
+
+  const ImageSkia source_;
+  const Size target_dip_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResizeSource);
+};
+
+class DropShadowSource : public ImageSkiaSource {
+ public:
+  DropShadowSource(const ImageSkia& source,
+                   const ShadowValues& dip_shadows)
+      : source_(source),
+        dip_shadows_(dip_shadows) {
+  }
+  virtual ~DropShadowSource() {}
+
+ private:
+  // gfx::ImageSkiaSource overrides:
+  virtual ImageSkiaRep GetImageForScale(ui::ScaleFactor scale_factor) OVERRIDE {
+    const ImageSkiaRep& image_rep = source_.GetRepresentation(scale_factor);
+
+    const float scale = image_rep.GetScale();
+    ShadowValues pixel_shadows;

[pkotwicz, 2012/07/10 22:59:56]

rename to shadows_in_pixel to be consistent with other parts in the code

[xiyuan, 2012/07/11 17:39:13]

Done.

+    for (size_t i = 0; i < dip_shadows_.size(); ++i)
+      pixel_shadows.push_back(dip_shadows_[i].Scale(scale));
+
+    const SkBitmap shadow_image = SkBitmapOperations::CreateDropShadow(
+        image_rep.sk_bitmap(),
+        pixel_shadows);
+    return ImageSkiaRep(shadow_image, image_rep.scale_factor());
+  }
+
+  const ImageSkia source_;
+  const ShadowValues dip_shadows_;
+
+  DISALLOW_COPY_AND_ASSIGN(DropShadowSource);
+};
+
+}  // namespace
+
+ImageSkiaSource* CreateResizeSource(const ImageSkia& source,
+                                    const Size& target_dip_size) {
+  return new ResizeSource(source, target_dip_size);
+}
+
+ImageSkiaSource* CreateDropShadowSource(const ImageSkia& source,
+                                        const ShadowValues& shadows) {
+  return new DropShadowSource(source, shadows);
+}
+
+}  // namespace image_skia_sources
+}  // namesoace gfx