// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// TODO(awalker): clean up the const/non-const reference handling in this test
#include "skia/ext/platform_canvas.h"
#include <stdint.h>
#include "base/memory/raw_ref.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "third_party/skia/include/core/SkPixelRef.h"
// Native drawing context is only used/supported on Windows.
#if BUILDFLAG(IS_WIN)
namespace skia {
namespace {
// Uses DstATop transfer mode with SK_ColorBLACK 0xff000000:
// the destination pixel will end up with 0xff alpha
// if it was transparent black (0x0) before the blend,
// it will be set to opaque black (0xff000000).
// if it has nonzero alpha before the blend,
// it will retain its color.
void MakeOpaque(SkCanvas* canvas, int x, int y, int width, int height) {
if (width <= 0 || height <= 0)
return;
SkRect rect;
rect.setXYWH(SkIntToScalar(x), SkIntToScalar(y),
SkIntToScalar(width), SkIntToScalar(height));
SkPaint paint;
paint.setColor(SK_ColorBLACK);
paint.setBlendMode(SkBlendMode::kDstATop);
canvas->drawRect(rect, paint);
}
bool IsOfColor(const SkBitmap& bitmap, int x, int y, uint32_t color) {
// For masking out the alpha values.
static uint32_t alpha_mask =
static_cast<uint32_t>(SK_A32_MASK) << SK_A32_SHIFT;
return (*bitmap.getAddr32(x, y) | alpha_mask) == (color | alpha_mask);
}
// Return true if the canvas is filled to canvas_color, and contains a single
// rectangle filled to rect_color. This function ignores the alpha channel,
// since Windows will sometimes clear the alpha channel when drawing, and we
// will fix that up later in cases it's necessary.
bool VerifyRect(const SkCanvas& canvas,
uint32_t canvas_color, uint32_t rect_color,
int x, int y, int w, int h) {
const SkBitmap bitmap = skia::ReadPixels(const_cast<SkCanvas*>(&canvas));
for (int cur_y = 0; cur_y < bitmap.height(); cur_y++) {
for (int cur_x = 0; cur_x < bitmap.width(); cur_x++) {
if (cur_x >= x && cur_x < x + w &&
cur_y >= y && cur_y < y + h) {
// Inside the square should be rect_color
if (!IsOfColor(bitmap, cur_x, cur_y, rect_color))
return false;
} else {
// Outside the square should be canvas_color
if (!IsOfColor(bitmap, cur_x, cur_y, canvas_color))
return false;
}
}
}
return true;
}
#if !defined(USE_AURA) && !BUILDFLAG(IS_MAC)
// Return true if canvas has something that passes for a rounded-corner
// rectangle. Basically, we're just checking to make sure that the pixels in the
// middle are of rect_color and pixels in the corners are of canvas_color.
bool VerifyRoundedRect(const SkCanvas& canvas,
uint32_t canvas_color,
uint32_t rect_color,
int x,
int y,
int w,
int h) {
SkPixmap pixmap;
ASSERT_TRUE(canvas.peekPixels(&pixmap));
SkBitmap bitmap;
bitmap.installPixels(pixmap);
// Check corner points first. They should be of canvas_color.
if (!IsOfColor(bitmap, x, y, canvas_color)) return false;
if (!IsOfColor(bitmap, x + w, y, canvas_color)) return false;
if (!IsOfColor(bitmap, x, y + h, canvas_color)) return false;
if (!IsOfColor(bitmap, x + w, y, canvas_color)) return false;
// Check middle points. They should be of rect_color.
if (!IsOfColor(bitmap, (x + w / 2), y, rect_color)) return false;
if (!IsOfColor(bitmap, x, (y + h / 2), rect_color)) return false;
if (!IsOfColor(bitmap, x + w, (y + h / 2), rect_color)) return false;
if (!IsOfColor(bitmap, (x + w / 2), y + h, rect_color)) return false;
return true;
}
#endif
// Checks whether there is a white canvas with a black square at the given
// location in pixels (not in the canvas coordinate system).
bool VerifyBlackRect(const SkCanvas& canvas, int x, int y, int w, int h) {
return VerifyRect(canvas, SK_ColorWHITE, SK_ColorBLACK, x, y, w, h);
}
// Check that every pixel in the canvas is a single color.
bool VerifyCanvasColor(const SkCanvas& canvas, uint32_t canvas_color) {
return VerifyRect(canvas, canvas_color, 0, 0, 0, 0, 0);
}
void DrawNativeRect(SkCanvas& canvas, int x, int y, int w, int h) {
HDC dc = skia::GetNativeDrawingContext(&canvas);
RECT inner_rc;
inner_rc.left = x;
inner_rc.top = y;
inner_rc.right = x + w;
inner_rc.bottom = y + h;
FillRect(dc, &inner_rc, reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
}
// Clips the contents of the canvas to the given rectangle. This will be
// intersected with any existing clip.
void AddClip(SkCanvas& canvas, int x, int y, int w, int h) {
SkRect rect;
rect.setXYWH(SkIntToScalar(x), SkIntToScalar(y), SkIntToScalar(w),
SkIntToScalar(h));
canvas.clipRect(rect);
}
class LayerSaver {
public:
LayerSaver(SkCanvas& canvas, int x, int y, int w, int h)
: canvas_(canvas),
x_(x),
y_(y),
w_(w),
h_(h) {
SkRect bounds;
bounds.setLTRB(SkIntToScalar(x_), SkIntToScalar(y_), SkIntToScalar(right()),
SkIntToScalar(bottom()));
canvas_->saveLayer(&bounds, NULL);
canvas.clear(SkColorSetARGB(0, 0, 0, 0));
}
~LayerSaver() { canvas_->restore(); }
int x() const { return x_; }
int y() const { return y_; }
int w() const { return w_; }
int h() const { return h_; }
// Returns the EXCLUSIVE far bounds of the layer.
int right() const { return x_ + w_; }
int bottom() const { return y_ + h_; }
private:
const raw_ref<SkCanvas> canvas_;
int x_, y_, w_, h_;
};
// Size used for making layers in many of the below tests.
const int kLayerX = 2;
const int kLayerY = 3;
const int kLayerW = 9;
const int kLayerH = 7;
// Size used by some tests to draw a rectangle inside the layer.
const int kInnerX = 4;
const int kInnerY = 5;
const int kInnerW = 2;
const int kInnerH = 3;
}
// This just checks that our checking code is working properly, it just uses
// regular skia primitives.
TEST(PlatformCanvas, SkLayer) {
// Create the canvas initialized to opaque white.
std::unique_ptr<SkCanvas> canvas = CreatePlatformCanvas(16, 16, true);
canvas->drawColor(SK_ColorWHITE);
// Make a layer and fill it completely to make sure that the bounds are
// correct.
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
canvas->drawColor(SK_ColorBLACK);
}
EXPECT_TRUE(VerifyBlackRect(*canvas, kLayerX, kLayerY, kLayerW, kLayerH));
}
// Test native clipping.
TEST(PlatformCanvas, ClipRegion) {
// Initialize a white canvas
std::unique_ptr<SkCanvas> canvas = CreatePlatformCanvas(16, 16, true);
canvas->drawColor(SK_ColorWHITE);
EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorWHITE));
// Test that initially the canvas has no clip region, by filling it
// with a black rectangle.
// Note: Don't use LayerSaver, since internally it sets a clip region.
DrawNativeRect(*canvas, 0, 0, 16, 16);
EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorBLACK));
// Test that intersecting disjoint clip rectangles sets an empty clip region
canvas->drawColor(SK_ColorWHITE);
EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorWHITE));
{
LayerSaver layer(*canvas, 0, 0, 16, 16);
AddClip(*canvas, 2, 3, 4, 5);
AddClip(*canvas, 4, 9, 10, 10);
DrawNativeRect(*canvas, 0, 0, 16, 16);
}
EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorWHITE));
}
// Test the layers get filled properly by native rendering.
TEST(PlatformCanvas, FillLayer) {
// Create the canvas initialized to opaque white.
std::unique_ptr<SkCanvas> canvas(CreatePlatformCanvas(16, 16, true));
// Make a layer and fill it completely to make sure that the bounds are
// correct.
canvas->drawColor(SK_ColorWHITE);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
DrawNativeRect(*canvas, 0, 0, 100, 100);
MakeOpaque(canvas.get(), 0, 0, 100, 100);
}
EXPECT_TRUE(VerifyBlackRect(*canvas, kLayerX, kLayerY, kLayerW, kLayerH));
// Make a layer and fill it partially to make sure the translation is correct.
canvas->drawColor(SK_ColorWHITE);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
DrawNativeRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
}
EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH));
// Add a clip on the layer and fill to make sure clip is correct.
canvas->drawColor(SK_ColorWHITE);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
canvas->save();
AddClip(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
DrawNativeRect(*canvas, 0, 0, 100, 100);
MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
canvas->restore();
}
EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH));
// Add a clip and then make the layer to make sure the clip is correct.
canvas->drawColor(SK_ColorWHITE);
canvas->save();
AddClip(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
DrawNativeRect(*canvas, 0, 0, 100, 100);
MakeOpaque(canvas.get(), 0, 0, 100, 100);
}
canvas->restore();
EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH));
}
// Test that translation + make layer works properly.
TEST(PlatformCanvas, TranslateLayer) {
// Create the canvas initialized to opaque white.
std::unique_ptr<SkCanvas> canvas = CreatePlatformCanvas(16, 16, true);
// Make a layer and fill it completely to make sure that the bounds are
// correct.
canvas->drawColor(SK_ColorWHITE);
canvas->save();
canvas->translate(1, 1);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
DrawNativeRect(*canvas, 0, 0, 100, 100);
MakeOpaque(canvas.get(), 0, 0, 100, 100);
}
canvas->restore();
EXPECT_TRUE(VerifyBlackRect(*canvas, kLayerX + 1, kLayerY + 1,
kLayerW, kLayerH));
// Translate then make the layer.
canvas->drawColor(SK_ColorWHITE);
canvas->save();
canvas->translate(1, 1);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
DrawNativeRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
}
canvas->restore();
EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX + 1, kInnerY + 1,
kInnerW, kInnerH));
// Make the layer then translate.
canvas->drawColor(SK_ColorWHITE);
canvas->save();
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
canvas->translate(1, 1);
DrawNativeRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
}
canvas->restore();
EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX + 1, kInnerY + 1,
kInnerW, kInnerH));
// Translate both before and after, and have a clip.
canvas->drawColor(SK_ColorWHITE);
canvas->save();
canvas->translate(1, 1);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
canvas->drawColor(SK_ColorWHITE);
canvas->translate(1, 1);
AddClip(*canvas, kInnerX + 1, kInnerY + 1, kInnerW - 1, kInnerH - 1);
DrawNativeRect(*canvas, 0, 0, 100, 100);
MakeOpaque(canvas.get(), kLayerX, kLayerY, kLayerW, kLayerH);
}
canvas->restore();
EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX + 3, kInnerY + 3,
kInnerW - 1, kInnerH - 1));
// TODO(dglazkov): Figure out why this fails on Mac (antialiased clipping?),
// modify test and remove this guard.
#if !defined(USE_AURA)
// Translate both before and after, and have a path clip.
canvas->drawColor(SK_ColorWHITE);
canvas->save();
canvas->translate(1, 1);
{
LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
canvas->drawColor(SK_ColorWHITE);
canvas->translate(1, 1);
SkPath path;
SkRect rect;
rect.iset(kInnerX - 1, kInnerY - 1,
kInnerX + kInnerW, kInnerY + kInnerH);
const SkScalar kRadius = 2.0;
path.addRoundRect(rect, kRadius, kRadius);
canvas->clipPath(path);
DrawNativeRect(*canvas, 0, 0, 100, 100);
MakeOpaque(canvas.get(), kLayerX, kLayerY, kLayerW, kLayerH);
}
canvas->restore();
EXPECT_TRUE(VerifyRoundedRect(*canvas, SK_ColorWHITE, SK_ColorBLACK,
kInnerX + 1, kInnerY + 1, kInnerW, kInnerH));
#endif
}
} // namespace skia
#endif // BUILDFLAG(IS_WIN)
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