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// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include "base/memory/platform_shared_memory_region.h"
#include "build/build_config.h"
#include "skia/ext/platform_canvas.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/blit.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
namespace {
// A TestPixelMap is a thin shim layer that allows writing a square canvas of
// 32-bit pixels as a flat array of 8-bit value, which makes the tests a bit
// less fiddly to read and maintain. At construction time, each 8-bit value is
// used to fill in each of the ARGB channels of the 32-bit pixels.
struct TestPixelMap {
static constexpr size_t kWidth = 5;
static constexpr size_t kHeight = 5;
static uint32_t ExpandByte(uint8_t b) {
return (b << 24) | (b << 16) | (b << 8) | b;
}
TestPixelMap(std::initializer_list<uint8_t> values) {
std::transform(values.begin(), values.end(), pixels.begin(),
&TestPixelMap::ExpandByte);
}
uint32_t AtXY(size_t x, size_t y) const { return pixels[y * kWidth + x]; }
std::array<uint32_t, kWidth * kHeight> pixels;
};
// Fills the given canvas with the values by duplicating the values into each
// color channel for the corresponding pixel.
//
// Example values = {{0x0, 0x01}, {0x12, 0xFF}} would give a canvas with:
// 0x00000000 0x01010101
// 0x12121212 0xFFFFFFFF
void SetToCanvas(SkCanvas* canvas, const TestPixelMap& values) {
ASSERT_EQ(TestPixelMap::kHeight,
base::checked_cast<size_t>(canvas->imageInfo().height()));
ASSERT_EQ(TestPixelMap::kWidth,
base::checked_cast<size_t>(canvas->imageInfo().width()));
SkImageInfo info =
SkImageInfo::MakeN32Premul(TestPixelMap::kWidth, TestPixelMap::kHeight);
canvas->writePixels(info, values.pixels.data(), TestPixelMap::kWidth * 4, 0,
0);
}
// Checks each pixel in the given canvas and see if it is made up of the given
// values, where each value has been duplicated into each channel of the given
// bitmap (see SetToCanvas above).
void VerifyCanvasValues(SkCanvas* canvas, const TestPixelMap& values) {
SkBitmap bitmap = skia::ReadPixels(canvas);
ASSERT_EQ(TestPixelMap::kHeight, base::checked_cast<size_t>(bitmap.height()));
ASSERT_EQ(TestPixelMap::kWidth, base::checked_cast<size_t>(bitmap.width()));
for (size_t y = 0; y < TestPixelMap::kHeight; y++) {
for (size_t x = 0; x < TestPixelMap::kWidth; x++) {
ASSERT_EQ(values.AtXY(x, y), *bitmap.getAddr32(x, y));
}
}
}
} // namespace
TEST(Blit, ScrollCanvas) {
const int kCanvasWidth = 5;
const int kCanvasHeight = 5;
std::unique_ptr<SkCanvas> canvas =
skia::CreatePlatformCanvas(kCanvasWidth, kCanvasHeight, false);
const TestPixelMap initial_values({0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x11,
0x12, 0x13, 0x14, 0x20, 0x21, 0x22, 0x23,
0x24, 0x30, 0x31, 0x32, 0x33, 0x34, 0x40,
0x41, 0x42, 0x43, 0x44});
SetToCanvas(canvas.get(), initial_values);
VerifyCanvasValues(canvas.get(), initial_values);
// Scroll none and make sure it's a NOP.
gfx::ScrollCanvas(canvas.get(),
gfx::Rect(0, 0, kCanvasWidth, kCanvasHeight),
gfx::Vector2d(0, 0));
VerifyCanvasValues(canvas.get(), initial_values);
// Scroll with a empty clip and make sure it's a NOP.
gfx::Rect empty_clip(1, 1, 0, 0);
gfx::ScrollCanvas(canvas.get(), empty_clip, gfx::Vector2d(0, 1));
VerifyCanvasValues(canvas.get(), initial_values);
// Scroll the center 3 pixels up one.
gfx::Rect center_three(1, 1, 3, 3);
gfx::ScrollCanvas(canvas.get(), center_three, gfx::Vector2d(0, -1));
const TestPixelMap scroll_up_expected(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x21, 0x22, 0x23,
0x14, 0x20, 0x31, 0x32, 0x33, 0x24, 0x30, 0x31, 0x32,
0x33, 0x34, 0x40, 0x41, 0x42, 0x43, 0x44});
VerifyCanvasValues(canvas.get(), scroll_up_expected);
// Reset and scroll the center 3 pixels down one.
SetToCanvas(canvas.get(), initial_values);
gfx::ScrollCanvas(canvas.get(), center_three, gfx::Vector2d(0, 1));
const TestPixelMap scroll_down_expected(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x11, 0x12, 0x13,
0x14, 0x20, 0x11, 0x12, 0x13, 0x24, 0x30, 0x21, 0x22,
0x23, 0x34, 0x40, 0x41, 0x42, 0x43, 0x44});
VerifyCanvasValues(canvas.get(), scroll_down_expected);
// Reset and scroll the center 3 pixels right one.
SetToCanvas(canvas.get(), initial_values);
gfx::ScrollCanvas(canvas.get(), center_three, gfx::Vector2d(1, 0));
const TestPixelMap scroll_right_expected(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x11, 0x11, 0x12,
0x14, 0x20, 0x21, 0x21, 0x22, 0x24, 0x30, 0x31, 0x31,
0x32, 0x34, 0x40, 0x41, 0x42, 0x43, 0x44});
VerifyCanvasValues(canvas.get(), scroll_right_expected);
// Reset and scroll the center 3 pixels left one.
SetToCanvas(canvas.get(), initial_values);
gfx::ScrollCanvas(canvas.get(), center_three, gfx::Vector2d(-1, 0));
const TestPixelMap scroll_left_expected(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x12, 0x13, 0x13,
0x14, 0x20, 0x22, 0x23, 0x23, 0x24, 0x30, 0x32, 0x33,
0x33, 0x34, 0x40, 0x41, 0x42, 0x43, 0x44});
VerifyCanvasValues(canvas.get(), scroll_left_expected);
// Diagonal scroll.
SetToCanvas(canvas.get(), initial_values);
gfx::ScrollCanvas(canvas.get(), center_three, gfx::Vector2d(2, 2));
const TestPixelMap scroll_diagonal_expected(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x11, 0x12, 0x13,
0x14, 0x20, 0x21, 0x22, 0x23, 0x24, 0x30, 0x31, 0x32,
0x11, 0x34, 0x40, 0x41, 0x42, 0x43, 0x44});
VerifyCanvasValues(canvas.get(), scroll_diagonal_expected);
}
#if BUILDFLAG(IS_WIN)
TEST(Blit, WithSharedMemory) {
const int kCanvasWidth = 5;
const int kCanvasHeight = 5;
base::subtle::PlatformSharedMemoryRegion section =
base::subtle::PlatformSharedMemoryRegion::CreateWritable(kCanvasWidth *
kCanvasHeight);
ASSERT_TRUE(section.IsValid());
std::unique_ptr<SkCanvas> canvas =
skia::CreatePlatformCanvasWithSharedSection(
kCanvasWidth, kCanvasHeight, false, section.GetPlatformHandle(),
skia::RETURN_NULL_ON_FAILURE);
ASSERT_TRUE(canvas);
// Closes a HANDLE associated with |section|, |canvas| must remain valid.
section = base::subtle::PlatformSharedMemoryRegion();
const TestPixelMap initial_values({0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x11,
0x12, 0x13, 0x14, 0x20, 0x21, 0x22, 0x23,
0x24, 0x30, 0x31, 0x32, 0x33, 0x34, 0x40,
0x41, 0x42, 0x43, 0x44});
SetToCanvas(canvas.get(), initial_values);
VerifyCanvasValues(canvas.get(), initial_values);
}
#endif
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