cc: Consolidate the analysis_canvas operations

skia/ext/analysis_canvas_unittest.cc

+// Copyright 2013 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 "base/compiler_specific.h"
+#include "skia/ext/analysis_canvas.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace skia {
+
+TEST(AnalysisCanvasTest, EmptyCanvas) {
+  SkBitmap emptyBitmap;
+  emptyBitmap.setConfig(SkBitmap::kNo_Config, 255, 255);
+  skia::AnalysisDevice device(emptyBitmap);
+  skia::AnalysisCanvas canvas(&device);
+  
+  SkColor color;
+  EXPECT_FALSE(canvas.getColorIfSolid(&color));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+}
+
+TEST(AnalysisCanvasTest, ClearCanvas) {
+  SkBitmap emptyBitmap;
+  emptyBitmap.setConfig(SkBitmap::kNo_Config, 255, 255);
+  skia::AnalysisDevice device(emptyBitmap);
+  skia::AnalysisCanvas canvas(&device);
+
+  // Transparent color
+  SkColor color = SkColorSetARGB(0, 12, 34, 56);
+  canvas.clear(color);
+
+  SkColor outputColor;
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_TRUE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  // Solid color
+  color = SkColorSetARGB(255, 65, 43, 21);
+  canvas.clear(color);
+
+  EXPECT_TRUE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+  EXPECT_EQ(outputColor, color);
+
+  // Translucent color
+  color = SkColorSetARGB(128, 11, 22, 33);
+  canvas.clear(color);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+}
+
+TEST(AnalysisCanvasTest, ComplexActions) {
+  SkBitmap emptyBitmap;
+  emptyBitmap.setConfig(SkBitmap::kNo_Config, 255, 255);
+  skia::AnalysisDevice device(emptyBitmap);
+  skia::AnalysisCanvas canvas(&device);
+
+  // Draw paint test.
+  SkColor color = SkColorSetARGB(255, 11, 22, 33);
+  SkPaint paint;
+  paint.setColor(color);
+
+  canvas.drawPaint(paint);
+
+  SkColor outputColor;
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));

[Justin Novosad, 2013/03/06 14:59:48]

Since you intend to come back to this later, you should file a bug, and insert a
TODO comment stating that this test should actually be EXPECT_TRUE

+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  // Draw points test.
+  SkPoint points[4] = {
+    SkPoint::Make(0, 0),
+    SkPoint::Make(255, 0),
+    SkPoint::Make(255, 255),
+    SkPoint::Make(0, 255)
+  };
+
+  canvas.drawPoints(SkCanvas::kLines_PointMode, 4, points, paint);

[Justin Novosad, 2013/03/06 14:59:48]

This is not a very effective test because you are not testing in isolation from
the previous test.  How do I know that drawPoints affects the state in any way
(maybe the state is just staying unchanged)? To verify that these draws actually
affect the analysis, it would make sense to draw them on top of a solid color
and/or a transparent color fill in order to verify that state transitions work.
For example:
transparentFill(canvas);
canvas.drawPoints(...);
EXPECT_FALSE(canvas.isTransparent());
EXPECT_TRUE(canvas.isCheap());
solidColorFill(canvas);
canvas.drawPoints(...);
EXPECT_FALSE(canvas.getColorIfSolid(&out));

+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  // Draw oval test.
+  canvas.drawOval(SkRect::MakeWH(255, 255), paint);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  // Draw bitmap test.
+  SkBitmap secondBitmap;
+  emptyBitmap.setConfig(SkBitmap::kNo_Config, 255, 255);
+  canvas.drawBitmap(secondBitmap, 0, 0);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+}
+
+TEST(AnalysisCanvasTest, SimpleDrawRect) {
+  SkBitmap emptyBitmap;
+  emptyBitmap.setConfig(SkBitmap::kNo_Config, 255, 255);
+  skia::AnalysisDevice device(emptyBitmap);
+  skia::AnalysisCanvas canvas(&device);
+
+  SkColor color = SkColorSetARGB(255, 11, 22, 33);
+  SkPaint paint;
+  paint.setColor(color);
+  canvas.clipRect(SkRect::MakeWH(255, 255));
+  canvas.drawRect(SkRect::MakeWH(255, 255), paint);
+
+  SkColor outputColor;
+  EXPECT_TRUE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+  EXPECT_EQ(color, outputColor);
+
+  color = SkColorSetARGB(255, 22, 33, 44);
+  paint.setColor(color);
+  canvas.translate(-128, -128);
+  canvas.drawRect(SkRect::MakeWH(382, 382), paint);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  color = SkColorSetARGB(255, 33, 44, 55);
+  paint.setColor(color);
+  canvas.drawRect(SkRect::MakeWH(383, 383), paint);
+
+  EXPECT_TRUE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+  EXPECT_EQ(color, outputColor);
+
+  color = SkColorSetARGB(0, 0, 0, 0);
+  paint.setColor(color);
+  canvas.drawRect(SkRect::MakeWH(383, 383), paint);
+
+  EXPECT_TRUE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+  EXPECT_EQ(outputColor, SkColorSetARGB(255, 33, 44, 55));
+
+  color = SkColorSetARGB(128, 128, 128, 128);
+  paint.setColor(color);
+  canvas.drawRect(SkRect::MakeWH(383, 383), paint);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  paint.setXfermodeMode(SkXfermode::kClear_Mode);

[Justin Novosad, 2013/03/06 14:59:48]

Should also have a similar test that creates a transparent canvas by using
SkXfermode::kSrc_Mode

+  canvas.drawRect(SkRect::MakeWH(382, 382), paint);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  canvas.drawRect(SkRect::MakeWH(383, 383), paint);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_TRUE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+
+  canvas.translate(128, 128);
+  color = SkColorSetARGB(255, 11, 22, 33);
+  paint.setColor(color);
+  paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
+  canvas.drawRect(SkRect::MakeWH(255, 255), paint);
+
+  EXPECT_TRUE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+  EXPECT_EQ(color, outputColor);
+
+  canvas.rotate(50);

[Justin Novosad, 2013/03/06 14:59:48]

Glad to see this covered.

+  canvas.drawRect(SkRect::MakeWH(255, 255), paint);
+
+  EXPECT_FALSE(canvas.getColorIfSolid(&outputColor));
+  EXPECT_FALSE(canvas.isTransparent());
+  EXPECT_TRUE(canvas.isCheap());
+}
+
+}  // namespace skia