Makes ImageSkia more like SkBitmap

ui/gfx/image/image_mac_unittest.mm

 // 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 <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/memory/scoped_nsobject.h"
+#include "base/memory/scoped_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_unittest_util.h"
 
 namespace {
 
 class ImageMacTest : public testing::Test {
  public:
   void CreateBitmapImageRep(int width, int height, NSImageRep** image_rep) {
     scoped_nsobject<NSImage> image(
         [[NSImage alloc] initWithSize:NSMakeSize(width, height)]);
     [image lockFocus];
     [[NSColor redColor] set];
     NSRectFill(NSMakeRect(0, 0, width, height));
     [image unlockFocus];
     EXPECT_TRUE([[[image representations] lastObject]
         isKindOfClass:[NSImageRep class]]);
     *image_rep = [[image representations] lastObject];
   }
 };
 
 namespace gt = gfx::test;
 
-TEST_F(ImageMacTest, MultiResolutionNSImageToSkBitmap) {
-  const int width1 = 10;
-  const int height1 = 12;
-  const int width2 = 20;
-  const int height2 = 24;
+TEST_F(ImageMacTest, MultiResolutionNSImageToImageSkia) {
+  const int width1x = 10;
+  const int height1x = 12;
+  const int width2x = 20;
+  const int height2x = 24;
 
   NSImageRep* image_rep_1;
-  CreateBitmapImageRep(width1, height1, &image_rep_1);
+  CreateBitmapImageRep(width1x, height1x, &image_rep_1);
   NSImageRep* image_rep_2;
-  CreateBitmapImageRep(width2, height2, &image_rep_2);
+  CreateBitmapImageRep(width2x, height2x, &image_rep_2);
   scoped_nsobject<NSImage> ns_image(
-      [[NSImage alloc] initWithSize:NSMakeSize(width1, height1)]);
+      [[NSImage alloc] initWithSize:NSMakeSize(width1x, height1x)]);
   [ns_image addRepresentation:image_rep_1];
   [ns_image addRepresentation:image_rep_2];
 
   gfx::Image image(ns_image.release());
 
   EXPECT_EQ(1u, image.RepresentationCount());
-  const std::vector<const SkBitmap*>& bitmaps = image.ToImageSkia()->bitmaps();
-  EXPECT_EQ(2u, bitmaps.size());
 
-  const SkBitmap* bitmap1 = bitmaps[0];
-  EXPECT_TRUE(bitmap1);
-  const SkBitmap* bitmap2 = bitmaps[1];
-  EXPECT_TRUE(bitmap2);
+  const gfx::ImageSkia* image_skia = image.ToImageSkia();
+  EXPECT_EQ(2u, image_skia->bitmaps().size());
 
-  if (bitmap1->width() == width1) {
-    EXPECT_EQ(bitmap1->height(), height1);
-    EXPECT_EQ(bitmap2->width(), width2);
-    EXPECT_EQ(bitmap2->height(), height2);
-  } else {
-    EXPECT_EQ(bitmap1->width(), width2);
-    EXPECT_EQ(bitmap1->height(), height2);
-    EXPECT_EQ(bitmap2->width(), width1);
-    EXPECT_EQ(bitmap2->height(), height1);
-  }
+  float scale_factor;
+  const SkBitmap& bitmap1x = image_skia.GetBitmapForScale(1.0f, 1.0f,
+                                                          &scale_factor);
+  EXPECT_TRUE(!bitmap1x.isNull());
+  EXPECT_EQ(1.0f, scale_factor);
+  EXPECT_EQ(width1x, bitmap1x.width());
+  EXPECT_EQ(height1x, bitmap1x.height());
+
+  const SkBitmap& bitmap2x = image_skia.GetBitmapForScale(2.0f, 2.0f,
+                                                          &scale_factor);
+  EXPECT_TRUE(!bitmap2x.isNull());
+  EXPECT_EQ(2.0f, scale_factor);
+  EXPECT_EQ(width2x, bitmap2x.width());
+  EXPECT_EQ(height2x, bitmap2x.height());
 
   // ToImageSkia should create a second representation.
   EXPECT_EQ(2u, image.RepresentationCount());
 }
 
-TEST_F(ImageMacTest, MultiResolutionSkBitmapToNSImage) {
-  const int width1 = 10;
-  const int height1 = 12;
-  const int width2 = 20;
-  const int height2 = 24;
+TEST_F(ImageMacTest, MultiResolutionImageSkiaToNSImage) {
+  const int width1x = 10;
+  const int height1x= 12;
+  const int width2x = 20;
+  const int height2x = 24;
 
-  std::vector<const SkBitmap*> bitmaps;
-  bitmaps.push_back(gt::CreateBitmap(width1, height1));
-  bitmaps.push_back(gt::CreateBitmap(width2, height2));
-  gfx::Image image(bitmaps);
+  scoped_ptr<SkBitmap> bitmap1x(gt::CreateBitmap(width1x, height1x));
+  scoped_ptr<SkBitmap> bitmap2x(gt::CreateBitmap(width2x, height2x));
+
+  gfx::ImageSkia image_skia;
+  image_skia.AddBitmapForScale(*bitmap1x, 1.0f);
+  image_skia.AddBitmapForScale(*bitmap2x, 2.0f);
+
+  gfx::Image image(image_skia);
 
   EXPECT_EQ(1u, image.RepresentationCount());
   EXPECT_EQ(2u, image.ToImageSkia()->bitmaps().size());
 
   NSImage* ns_image = image;
   EXPECT_TRUE(ns_image);
 
+  // Image size should be the same as the 1x bitmap.
+  EXPECT_EQ([ns_image size].width, width1x);
+  EXPECT_EQ([ns_image size].height, height1x);
+
   EXPECT_EQ(2u, [[image representations] count]);
   NSImageRep* image_rep_1 = [[image representations] objectAtIndex:0];
   NSImageRep* image_rep_2 = [[image representations] objectAtIndex:1];
 
-  if ([image_rep_1 size].width == width1) {
-    EXPECT_EQ([image_rep_1 size].height, height1);
-    EXPECT_EQ([image_rep_2 size].width, width2);
-    EXPECT_EQ([image_rep_2 size].height, height2);
+  if ([image_rep_1 size].width == width1x) {
+    EXPECT_EQ([image_rep_1 size].width, width1x);
+    EXPECT_EQ([image_rep_1 size].height, height1x);
+    EXPECT_EQ([image_rep_2 size].width, width2x);
+    EXPECT_EQ([image_rep_2 size].height, height2x);
   } else {
-    EXPECT_EQ([image_rep_1 size].width, width2);
-    EXPECT_EQ([image_rep_1 size].height, height2);
-    EXPECT_EQ([image_rep_2 size].width, width1);
-    EXPECT_EQ([image_rep_2 size].height, height1);
+    EXPECT_EQ([image_rep_1 size].width, width2x);
+    EXPECT_EQ([image_rep_1 size].height, height2x);
+    EXPECT_EQ([image_rep_2 size].width, width1x);
+    EXPECT_EQ([image_rep_2 size].height, height1x);
   }
 
   // Cast to NSImage* should create a second representation.
   EXPECT_EQ(2u, image.RepresentationCount());
 }
 
 } // namespace