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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/accessibility/switch_access/point_scan_controller.h"
#include "ash/shell.h"
#include "ash/test/ash_test_base.h"
#include "ash/test/test_window_builder.h"
#include "base/command_line.h"
#include "base/functional/bind.h"
#include "base/test/scoped_feature_list.h"
#include "base/types/fixed_array.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/aura/window.h"
#include "ui/compositor/compositor_switches.h"
#include "ui/gfx/image/image.h"
#include "ui/snapshot/snapshot.h"
namespace ash {
class PointScanControllerTest : public AshTestBase {
public:
PointScanControllerTest(const PointScanControllerTest&) = delete;
PointScanControllerTest& operator=(const PointScanControllerTest&) = delete;
protected:
PointScanControllerTest() = default;
~PointScanControllerTest() override = default;
// AshTestBase:
void SetUp() override {
base::CommandLine::ForCurrentProcess()->AppendSwitch(
::switches::kEnablePixelOutputInTests);
AshTestBase::SetUp();
}
void CaptureBeforeImage(const gfx::Rect& bounds) {
Capture(bounds);
if (before_bmp_.tryAllocPixels(image_.AsBitmap().info())) {
image_.AsBitmap().readPixels(before_bmp_.info(), before_bmp_.getPixels(),
before_bmp_.rowBytes(), 0, 0);
}
}
void CaptureAfterImage(const gfx::Rect& bounds) {
Capture(bounds);
if (after_bmp_.tryAllocPixels(image_.AsBitmap().info())) {
image_.AsBitmap().readPixels(after_bmp_.info(), after_bmp_.getPixels(),
after_bmp_.rowBytes(), 0, 0);
}
}
void Capture(const gfx::Rect& bounds) {
// Occasionally we don't get any pixels the first try.
// Keep trying until we get the correct size bitmap and the first pixel
// is transparent.
while (true) {
aura::Window* window = Shell::GetPrimaryRootWindow();
base::RunLoop run_loop;
ui::GrabWindowSnapshotAndScale(
window, bounds, bounds.size(),
base::BindOnce(
[](base::RunLoop* run_loop, gfx::Image* image,
gfx::Image got_image) {
run_loop->Quit();
*image = got_image;
},
&run_loop, &image_));
run_loop.Run();
SkBitmap bitmap = image_.AsBitmap();
if (bitmap.width() != bounds.width() ||
bitmap.height() != bounds.height()) {
LOG(INFO) << "Bitmap not correct size, trying to capture again";
continue;
} else if (255 == SkColorGetA(bitmap.getColor(0, 0))) {
LOG(INFO) << "Bitmap is transparent, trying to capture again";
break;
}
}
}
void ComputeImageStats() {
diff_count_ = 0;
row_diff_count_ = 0;
col_diff_count_ = 0;
base::FixedArray<bool> row_diff_tracker_(before_bmp_.height(), false);
for (int x = 0; x < before_bmp_.width(); ++x) {
bool col_diff = false;
for (int y = 0; y < before_bmp_.height(); ++y) {
SkColor before_color = before_bmp_.getColor(x, y);
SkColor after_color = after_bmp_.getColor(x, y);
if (before_color != after_color) {
diff_count_++;
col_diff = true;
row_diff_tracker_[y] = true;
}
}
if (col_diff)
++col_diff_count_;
}
for (int i = 0; i < before_bmp_.height(); ++i) {
if (row_diff_tracker_[i])
++row_diff_count_;
}
}
int diff_count() const { return diff_count_; }
int row_diff_count() const { return row_diff_count_; }
int col_diff_count() const { return col_diff_count_; }
private:
gfx::Image image_;
SkBitmap before_bmp_;
SkBitmap after_bmp_;
int diff_count_ = 0;
int row_diff_count_ = 0;
int col_diff_count_ = 0;
};
TEST_F(PointScanControllerTest, StartScanning) {
gfx::Rect bounds = Shell::GetPrimaryRootWindow()->bounds();
// Create a white background window for captured image color smoke test.
std::unique_ptr<aura::Window> window =
TestWindowBuilder()
.SetColorWindowDelegate(SK_ColorWHITE)
.SetBounds(bounds)
.Build();
// For some reason, the white window is not fully drawn the first time we call
// CaptureBeforeImage.
CaptureBeforeImage(bounds);
CaptureBeforeImage(bounds);
PointScanController controller;
controller.StartHorizontalRangeScan();
CaptureAfterImage(bounds);
ComputeImageStats();
}
} // namespace ash
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