Implement all resolution change policies for desktop and tab capture.

content/browser/media/capture/capture_resolution_evaluator_unittest.cc

+// Copyright 2015 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 "content/browser/media/capture/capture_resolution_evaluator.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+// 16:9 maximum and minimum frame sizes.
+const int kMaxFrameWidth = 3840;
+const int kMaxFrameHeight = 2160;
+const int kMinFrameWidth = 320;
+const int kMinFrameHeight = 180;
+
+}  // namespace
+
+TEST(CaptureResolutionEvaluatorTest,
+     FixedResolutionPolicy_CaptureSizeAlwaysFixed) {
+  const gfx::Size the_one_frame_size(kMaxFrameWidth, kMaxFrameHeight);
+  CaptureResolutionEvaluator evaluator(
+      the_one_frame_size,
+      media::RESOLUTION_POLICY_FIXED_RESOLUTION);
+  EXPECT_EQ(the_one_frame_size, evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(the_one_frame_size);
+  EXPECT_EQ(the_one_frame_size, evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(gfx::Size(kMaxFrameWidth + 424,
+                                             kMaxFrameHeight - 101));
+  EXPECT_EQ(the_one_frame_size, evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(gfx::Size(kMaxFrameWidth - 202,
+                                             kMaxFrameHeight + 56));
+  EXPECT_EQ(the_one_frame_size, evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(gfx::Size(kMinFrameWidth, kMinFrameHeight));
+  EXPECT_EQ(the_one_frame_size, evaluator.capture_size());
+}
+
+TEST(CaptureResolutionEvaluatorTest,
+     FixedAspectRatioPolicy_CaptureSizeHasSameAspectRatio) {
+  CaptureResolutionEvaluator evaluator(
+      gfx::Size(kMaxFrameWidth, kMaxFrameHeight),
+      media::RESOLUTION_POLICY_FIXED_ASPECT_RATIO);
+
+#define EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO()               \
+  ASSERT_LE(kMinFrameWidth, evaluator.capture_size().width());        \
+  ASSERT_LE(kMinFrameHeight, evaluator.capture_size().height());      \
+  EXPECT_GE(kMaxFrameWidth, evaluator.capture_size().width());        \
+  EXPECT_GE(kMaxFrameHeight, evaluator.capture_size().height());      \
+  EXPECT_NEAR(static_cast<double>(kMaxFrameWidth) / kMaxFrameHeight,  \
+              static_cast<double>(evaluator.capture_size().width()) / \
+                  evaluator.capture_size().height(),                  \
+              0.01)
+
+  // Starting condition.
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+
+  // Max size in --> max size out.
+  evaluator.UpdateForNewSourceSize(gfx::Size(kMaxFrameWidth, kMaxFrameHeight));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+
+  // Various source sizes within bounds.
+  evaluator.UpdateForNewSourceSize(gfx::Size(640, 480));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+  evaluator.UpdateForNewSourceSize(gfx::Size(480, 640));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+  evaluator.UpdateForNewSourceSize(gfx::Size(640, 640));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+  const gfx::Size unchanged_size = evaluator.capture_size();
+
+  // Bad source size results in no update.
+  evaluator.UpdateForNewSourceSize(gfx::Size(0, 0));
+  EXPECT_EQ(unchanged_size, evaluator.capture_size());
+
+  // Downscaling size (preserving aspect ratio) when source size exceeds the
+  // upper bounds.
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMaxFrameWidth * 2, kMaxFrameHeight * 2));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMaxFrameWidth * 2, kMaxFrameHeight));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMaxFrameWidth, kMaxFrameHeight * 2));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+
+  // Upscaling size (preserving aspect ratio) when source size is under the
+  // lower bounds.
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMinFrameWidth / 2, kMinFrameHeight / 2));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMinFrameWidth / 2, kMaxFrameHeight));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMinFrameWidth, kMinFrameHeight / 2));
+  EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO();
+
+#undef EXPECT_IS_WITHIN_BOUNDS_AND_SAME_ASPECT_RATIO
+}
+
+TEST(CaptureResolutionEvaluatorTest,
+     AnyWithinLimitPolicy_CaptureSizeIsAnythingWithinLimits) {
+  const gfx::Size max_size(kMaxFrameWidth, kMaxFrameHeight);
+  CaptureResolutionEvaluator evaluator(
+      max_size, media::RESOLUTION_POLICY_ANY_WITHIN_LIMIT);
+
+  // Starting condition.
+  EXPECT_EQ(max_size, evaluator.capture_size());
+
+  // Max size in --> max size out.
+  evaluator.UpdateForNewSourceSize(max_size);
+  EXPECT_EQ(max_size, evaluator.capture_size());
+
+  // Various source sizes within bounds.
+  evaluator.UpdateForNewSourceSize(gfx::Size(640, 480));
+  EXPECT_EQ(gfx::Size(640, 480), evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(gfx::Size(480, 640));
+  EXPECT_EQ(gfx::Size(480, 640), evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(gfx::Size(640, 640));
+  EXPECT_EQ(gfx::Size(640, 640), evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(gfx::Size(2, 2));
+  EXPECT_EQ(gfx::Size(2, 2), evaluator.capture_size());
+  const gfx::Size unchanged_size = evaluator.capture_size();
+
+  // Bad source size results in no update.
+  evaluator.UpdateForNewSourceSize(gfx::Size(0, 0));
+  EXPECT_EQ(unchanged_size, evaluator.capture_size());
+
+  // Downscaling size (preserving aspect ratio) when source size exceeds the
+  // upper bounds.
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMaxFrameWidth * 2, kMaxFrameHeight * 2));
+  EXPECT_EQ(max_size, evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMaxFrameWidth * 2, kMaxFrameHeight));
+  EXPECT_EQ(gfx::Size(kMaxFrameWidth, kMaxFrameHeight / 2),
+            evaluator.capture_size());
+  evaluator.UpdateForNewSourceSize(
+      gfx::Size(kMaxFrameWidth, kMaxFrameHeight * 2));
+  EXPECT_EQ(gfx::Size(kMaxFrameWidth / 2, kMaxFrameHeight),
+            evaluator.capture_size());
+}
+
+}  // namespace content