/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
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* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
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* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TransparencyWin.h"
#include "AffineTransform.h"
#include "ImageBuffer.h"
#include <gtest/gtest.h>
#include <windows.h>
namespace WebCore {
static FloatRect RECTToFloatRect(const RECT* rect)
{
return FloatRect(static_cast<float>(rect->left),
static_cast<float>(rect->top),
static_cast<float>(rect->right - rect->left),
static_cast<float>(rect->bottom - rect->top));
}
static void drawNativeRect(GraphicsContext* context,
int x, int y, int w, int h)
{
SkCanvas* canvas = context->platformContext()->canvas();
HDC dc = skia::BeginPlatformPaint(canvas);
RECT innerRc;
innerRc.left = x;
innerRc.top = y;
innerRc.right = x + w;
innerRc.bottom = y + h;
FillRect(dc, &innerRc,
reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
skia::EndPlatformPaint(canvas);
}
static Color getPixelAt(GraphicsContext* context, int x, int y)
{
const SkBitmap& bitmap = context->platformContext()->canvas()->getTopDevice()->accessBitmap(false);
return Color(*reinterpret_cast<const RGBA32*>(bitmap.getAddr32(x, y)));
}
// Resets the top layer's alpha channel to 0 for each pixel. This simulates
// Windows messing it up.
static void clearTopLayerAlphaChannel(GraphicsContext* context)
{
SkBitmap& bitmap = const_cast<SkBitmap&>(context->platformContext()->canvas()->getTopDevice()->accessBitmap(false));
for (int y = 0; y < bitmap.height(); y++) {
uint32_t* row = bitmap.getAddr32(0, y);
for (int x = 0; x < bitmap.width(); x++)
row[x] &= 0x00FFFFFF;
}
}
// Clears the alpha channel on the specified pixel.
static void clearTopLayerAlphaPixel(GraphicsContext* context, int x, int y)
{
SkBitmap& bitmap = const_cast<SkBitmap&>(context->platformContext()->canvas()->getTopDevice()->accessBitmap(false));
*bitmap.getAddr32(x, y) &= 0x00FFFFFF;
}
static std::ostream& operator<<(std::ostream& out, const Color& c)
{
std::ios_base::fmtflags oldFlags = out.flags(std::ios_base::hex |
std::ios_base::showbase);
out << c.rgb();
out.flags(oldFlags);
return out;
}
TEST(TransparencyWin, NoLayer)
{
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(17, 16), ColorSpaceDeviceRGB));
// KeepTransform
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::NoLayer,
TransparencyWin::KeepTransform,
IntRect(1, 1, 14, 12));
EXPECT_TRUE(src->context() == helper.context());
EXPECT_TRUE(IntSize(14, 12) == helper.m_layerSize);
EXPECT_TRUE(IntRect(1, 1, 14, 12) == helper.drawRect());
}
// Untransform is not allowed for NoLayer.
// ScaleTransform
src->context()->save();
src->context()->scale(FloatSize(2.0, 0.5));
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::NoLayer,
TransparencyWin::ScaleTransform,
IntRect(2, 2, 6, 6));
helper.composite();
// The coordinate system should be based in the upper left of our box.
// It should be post-transformed.
EXPECT_TRUE(src->context() == helper.context());
EXPECT_TRUE(IntSize(12, 3) == helper.m_layerSize);
EXPECT_TRUE(IntRect(4, 1, 12, 3) == helper.drawRect());
}
src->context()->restore();
}
TEST(TransparencyWin, WhiteLayer)
{
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
// KeepTransform
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::WhiteLayer,
TransparencyWin::KeepTransform,
IntRect(1, 1, 14, 12));
helper.composite();
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(14, 12) == helper.m_layerSize);
EXPECT_TRUE(IntRect(1, 1, 14, 12) == helper.drawRect());
}
// Untransform
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::WhiteLayer,
TransparencyWin::Untransform,
IntRect(1, 1, 14, 12));
helper.composite();
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(14, 12) == helper.m_layerSize);
EXPECT_TRUE(IntRect(0, 0, 14, 12) == helper.drawRect());
}
// ScaleTransform
src->context()->save();
src->context()->scale(FloatSize(2.0, 0.5));
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::WhiteLayer,
TransparencyWin::ScaleTransform,
IntRect(2, 2, 6, 6));
helper.composite();
// The coordinate system should be based in the upper left of our box.
// It should be post-transformed.
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(12, 3) == helper.m_layerSize);
EXPECT_TRUE(IntRect(0, 0, 12, 3) == helper.drawRect());
}
src->context()->restore();
}
TEST(TransparencyWin, TextComposite)
{
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
// KeepTransform is the only valid transform mode for TextComposite.
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::TextComposite,
TransparencyWin::KeepTransform,
IntRect(1, 1, 14, 12));
helper.composite();
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(14, 12) == helper.m_layerSize);
EXPECT_TRUE(IntRect(1, 1, 14, 12) == helper.drawRect());
}
}
TEST(TransparencyWin, OpaqueCompositeLayer)
{
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
// KeepTransform
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::KeepTransform,
IntRect(1, 1, 14, 12));
helper.composite();
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(14, 12) == helper.m_layerSize);
EXPECT_TRUE(IntRect(1, 1, 14, 12) == helper.drawRect());
}
// KeepTransform with scroll applied.
src->context()->save();
src->context()->translate(0, -1);
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::KeepTransform,
IntRect(1, 1, 14, 14));
helper.composite();
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(14, 14) == helper.m_layerSize);
EXPECT_TRUE(IntRect(1, 1, 14, 14) == helper.drawRect());
}
src->context()->restore();
// Untransform
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::Untransform,
IntRect(1, 1, 14, 12));
helper.composite();
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(14, 12) == helper.m_layerSize);
EXPECT_TRUE(IntRect(0, 0, 14, 12) == helper.drawRect());
}
// ScaleTransform
src->context()->save();
src->context()->scale(FloatSize(2.0, 0.5));
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::ScaleTransform,
IntRect(2, 2, 6, 6));
helper.composite();
// The coordinate system should be based in the upper left of our box.
// It should be post-transformed.
EXPECT_TRUE(src->context() != helper.context());
EXPECT_TRUE(IntSize(12, 3) == helper.m_layerSize);
EXPECT_TRUE(IntRect(0, 0, 12, 3) == helper.drawRect());
}
src->context()->restore();
}
TEST(TransparencyWin, WhiteLayerPixelTest)
{
// Make a total transparent buffer, and draw the white layer inset by 1 px.
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::WhiteLayer,
TransparencyWin::KeepTransform,
IntRect(1, 1, 14, 14));
// Coordinates should be in the original space, not the layer.
drawNativeRect(helper.context(), 3, 3, 1, 1);
clearTopLayerAlphaChannel(helper.context());
helper.composite();
}
// The final image should be transparent around the edges for 1 px, white
// in the middle, with (3,3) (what we drew above) being opaque black.
EXPECT_EQ(Color(Color::transparent), getPixelAt(src->context(), 0, 0));
EXPECT_EQ(Color(Color::white), getPixelAt(src->context(), 2, 2));
EXPECT_EQ(Color(Color::black), getPixelAt(src->context(), 3, 3));
EXPECT_EQ(Color(Color::white), getPixelAt(src->context(), 4, 4));
}
TEST(TransparencyWin, OpaqueCompositeLayerPixel)
{
Color red(0xFFFF0000), darkRed(0xFFBF0000);
Color green(0xFF00FF00);
// Make a red bottom layer, followed by a half green next layer @ 50%.
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
FloatRect fullRect(0, 0, 16, 16);
src->context()->fillRect(fullRect, red, ColorSpaceDeviceRGB);
src->context()->beginTransparencyLayer(0.5);
FloatRect rightHalf(8, 0, 8, 16);
src->context()->fillRect(rightHalf, green, ColorSpaceDeviceRGB);
// Make a transparency layer inset by one pixel, and fill it inset by
// another pixel with 50% black.
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::KeepTransform,
IntRect(1, 1, 14, 14));
FloatRect inner(2, 2, 12, 12);
helper.context()->fillRect(inner, Color(0x7f000000), ColorSpaceDeviceRGB);
// These coordinates are relative to the layer, whish is inset by 1x1
// pixels from the top left. So we're actually clearing (2, 2) and
// (13,13), which are the extreme corners of the black area (and which
// we check below).
clearTopLayerAlphaPixel(helper.context(), 1, 1);
clearTopLayerAlphaPixel(helper.context(), 12, 12);
helper.composite();
}
// Finish the compositing.
src->context()->endTransparencyLayer();
// Check that we got the right values, it should be like the rectangle was
// drawn with half opacity even though the alpha channel got messed up.
EXPECT_EQ(red, getPixelAt(src->context(), 0, 0));
EXPECT_EQ(red, getPixelAt(src->context(), 1, 1));
EXPECT_EQ(darkRed, getPixelAt(src->context(), 2, 2));
// The dark result is:
// (black @ 50% atop green) @ 50% atop red = 0xFF804000
// which is 0xFFA02000 (Skia computes 0xFFA11F00 due to rounding).
Color darkGreenRed(0xFF803f00);
EXPECT_EQ(darkGreenRed, getPixelAt(src->context(), 13, 13));
// 50% green on top of red = FF808000 (rounded to what Skia will produce).
Color greenRed(0xFF807F00);
EXPECT_EQ(greenRed, getPixelAt(src->context(), 14, 14));
EXPECT_EQ(greenRed, getPixelAt(src->context(), 15, 15));
}
// Tests that translations are properly handled when using KeepTransform.
TEST(TransparencyWin, TranslateOpaqueCompositeLayer)
{
// Fill with white.
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
Color white(0xFFFFFFFF);
FloatRect fullRect(0, 0, 16, 16);
src->context()->fillRect(fullRect, white, ColorSpaceDeviceRGB);
// Scroll down by 8 (coordinate system goes up).
src->context()->save();
src->context()->translate(0, -8);
Color red(0xFFFF0000);
Color green(0xFF00FF00);
{
// Make the transparency layer after translation will be @ (0, -8) with
// size 16x16.
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::KeepTransform,
IntRect(0, 0, 16, 16));
// Draw a red pixel at (15, 15). This should be the at (15, 7) after
// the transform.
FloatRect bottomRight(15, 15, 1, 1);
helper.context()->fillRect(bottomRight, green, ColorSpaceDeviceRGB);
helper.composite();
}
src->context()->restore();
// Check the pixel we wrote.
EXPECT_EQ(green, getPixelAt(src->context(), 15, 7));
}
// Same as OpaqueCompositeLayer, but the canvas has a rotation applied. This
// tests that the propert transform is applied to the copied layer.
TEST(TransparencyWin, RotateOpaqueCompositeLayer)
{
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
// The background is white.
Color white(0xFFFFFFFF);
FloatRect fullRect(0, 0, 16, 16);
src->context()->fillRect(fullRect, white, ColorSpaceDeviceRGB);
// Rotate the image by 90 degrees. This matrix is the same as
// cw90.rotate(90); but avoids rounding errors. Rounding errors can cause
// Skia to think that !rectStaysRect() and it will fall through to path
// drawing mode, which in turn gives us antialiasing. We want no
// antialiasing or other rounding problems since we're testing exact pixel
// values.
src->context()->save();
AffineTransform cw90(0, 1, -1, 0, 0, 0);
src->context()->concatCTM(cw90);
// Make a transparency layer consisting of a horizontal line of 50% black.
// Since the rotation is applied, this will actually be a vertical line
// down the middle of the image.
src->context()->beginTransparencyLayer(0.5);
FloatRect blackRect(0, -9, 16, 2);
Color black(0xFF000000);
src->context()->fillRect(blackRect, black, ColorSpaceDeviceRGB);
// Now draw 50% red square.
{
// Create a transparency helper inset one pixel in the buffer. The
// coordinates are before transforming into this space, and maps to
// IntRect(1, 1, 14, 14).
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::Untransform,
IntRect(1, -15, 14, 14));
// Fill with red.
helper.context()->fillRect(helper.drawRect(), Color(0x7f7f0000), ColorSpaceDeviceRGB);
clearTopLayerAlphaChannel(helper.context());
helper.composite();
}
// Finish the compositing.
src->context()->endTransparencyLayer();
// Top corner should be the original background.
EXPECT_EQ(white, getPixelAt(src->context(), 0, 0));
// Check the stripe down the middle, first at the top...
Color gray(0xFF808080);
EXPECT_EQ(white, getPixelAt(src->context(), 6, 0));
EXPECT_EQ(gray, getPixelAt(src->context(), 7, 0));
EXPECT_EQ(gray, getPixelAt(src->context(), 8, 0));
EXPECT_EQ(white, getPixelAt(src->context(), 9, 0));
// ...now at the bottom.
EXPECT_EQ(white, getPixelAt(src->context(), 6, 15));
EXPECT_EQ(gray, getPixelAt(src->context(), 7, 15));
EXPECT_EQ(gray, getPixelAt(src->context(), 8, 15));
EXPECT_EQ(white, getPixelAt(src->context(), 9, 15));
// Our red square should be 25% red over the top of those two.
Color redwhite(0xFFdfbfbf);
Color redgray(0xFF9f8080);
EXPECT_EQ(white, getPixelAt(src->context(), 0, 1));
EXPECT_EQ(redwhite, getPixelAt(src->context(), 1, 1));
EXPECT_EQ(redwhite, getPixelAt(src->context(), 6, 1));
EXPECT_EQ(redgray, getPixelAt(src->context(), 7, 1));
EXPECT_EQ(redgray, getPixelAt(src->context(), 8, 1));
EXPECT_EQ(redwhite, getPixelAt(src->context(), 9, 1));
EXPECT_EQ(redwhite, getPixelAt(src->context(), 14, 1));
EXPECT_EQ(white, getPixelAt(src->context(), 15, 1));
// Complete the 50% transparent layer.
src->context()->restore();
}
TEST(TransparencyWin, TranslateScaleOpaqueCompositeLayer)
{
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
// The background is white on top with red on bottom.
Color white(0xFFFFFFFF);
FloatRect topRect(0, 0, 16, 8);
src->context()->fillRect(topRect, white, ColorSpaceDeviceRGB);
Color red(0xFFFF0000);
FloatRect bottomRect(0, 8, 16, 8);
src->context()->fillRect(bottomRect, red, ColorSpaceDeviceRGB);
src->context()->save();
// Translate left by one pixel.
AffineTransform left;
left.translate(-1, 0);
// Scale by 2x.
AffineTransform scale;
scale.scale(2.0);
src->context()->concatCTM(scale);
// Then translate up by one pixel (which will actually be 2 due to scaling).
AffineTransform up;
up.translate(0, -1);
src->context()->concatCTM(up);
// Now draw 50% red square.
{
// Create a transparency helper inset one pixel in the buffer. The
// coordinates are before transforming into this space, and maps to
// IntRect(1, 1, 14, 14).
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::KeepTransform,
IntRect(1, -15, 14, 14));
// Fill with red.
helper.context()->fillRect(helper.drawRect(), Color(0x7f7f0000), ColorSpaceDeviceRGB);
clearTopLayerAlphaChannel(helper.context());
helper.composite();
}
}
// Tests scale mode with no additional copy.
TEST(TransparencyWin, Scale)
{
// Create an opaque white buffer.
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
FloatRect fullBuffer(0, 0, 16, 16);
src->context()->fillRect(fullBuffer, Color::white, ColorSpaceDeviceRGB);
// Scale by 2x.
src->context()->save();
AffineTransform scale;
scale.scale(2.0);
src->context()->concatCTM(scale);
// Start drawing a rectangle from 1->4. This should get scaled to 2->8.
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::NoLayer,
TransparencyWin::ScaleTransform,
IntRect(1, 1, 3, 3));
// The context should now have the identity transform and the returned
// rect should be scaled.
EXPECT_TRUE(helper.context()->getCTM().isIdentity());
EXPECT_EQ(2, helper.drawRect().x());
EXPECT_EQ(2, helper.drawRect().y());
EXPECT_EQ(8, helper.drawRect().maxX());
EXPECT_EQ(8, helper.drawRect().maxY());
// Set the pixel at (2, 2) to be transparent. This should be fixed when
// the helper goes out of scope. We don't want to call
// clearTopLayerAlphaChannel because that will actually clear the whole
// canvas (since we have no extra layer!).
SkBitmap& bitmap = const_cast<SkBitmap&>(helper.context()->platformContext()->canvas()->getTopDevice()->accessBitmap(false));
*bitmap.getAddr32(2, 2) &= 0x00FFFFFF;
helper.composite();
}
src->context()->restore();
// Check the pixel we previously made transparent, it should have gotten
// fixed back up to white.
// The current version doesn't fixup transparency when there is no layer.
// This seems not to be necessary, so we don't bother, but if it becomes
// necessary, this line should be uncommented.
// EXPECT_EQ(Color(Color::white), getPixelAt(src->context(), 2, 2));
}
// Tests scale mode with an additional copy for transparency. This will happen
// if we have a scaled textbox, for example. WebKit will create a new
// transparency layer, draw the text field, then draw the text into it, then
// composite this down with an opacity.
TEST(TransparencyWin, ScaleTransparency)
{
// Create an opaque white buffer.
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
FloatRect fullBuffer(0, 0, 16, 16);
src->context()->fillRect(fullBuffer, Color::white, ColorSpaceDeviceRGB);
// Make another layer (which duplicates how WebKit will make this). We fill
// the top half with red, and have the layer be 50% opaque.
src->context()->beginTransparencyLayer(0.5);
FloatRect topHalf(0, 0, 16, 8);
src->context()->fillRect(topHalf, Color(0xFFFF0000), ColorSpaceDeviceRGB);
// Scale by 2x.
src->context()->save();
AffineTransform scale;
scale.scale(2.0);
src->context()->concatCTM(scale);
// Make a layer inset two pixels (because of scaling, this is 2->14). And
// will it with 50% black.
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::OpaqueCompositeLayer,
TransparencyWin::ScaleTransform,
IntRect(1, 1, 6, 6));
helper.context()->fillRect(helper.drawRect(), Color(0x7f000000), ColorSpaceDeviceRGB);
clearTopLayerAlphaChannel(helper.context());
helper.composite();
}
// Finish the layer.
src->context()->restore();
src->context()->endTransparencyLayer();
Color redBackground(0xFFFF8080); // 50% red composited on white.
EXPECT_EQ(redBackground, getPixelAt(src->context(), 0, 0));
EXPECT_EQ(redBackground, getPixelAt(src->context(), 1, 1));
// Top half (minus two pixel border) should be 50% gray atop opaque
// red = 0xFF804141. Then that's composited with 50% transparency on solid
// white = 0xFFC0A1A1.
Color darkRed(0xFFBF8080);
EXPECT_EQ(darkRed, getPixelAt(src->context(), 2, 2));
EXPECT_EQ(darkRed, getPixelAt(src->context(), 7, 7));
// Bottom half (minus a two pixel border) should be a layer with 5% gray
// with another 50% opacity composited atop white.
Color darkWhite(0xFFBFBFBF);
EXPECT_EQ(darkWhite, getPixelAt(src->context(), 8, 8));
EXPECT_EQ(darkWhite, getPixelAt(src->context(), 13, 13));
Color white(0xFFFFFFFF); // Background in the lower-right.
EXPECT_EQ(white, getPixelAt(src->context(), 14, 14));
EXPECT_EQ(white, getPixelAt(src->context(), 15, 15));
}
TEST(TransparencyWin, Text)
{
OwnPtr<ImageBuffer> src(ImageBuffer::create(IntSize(16, 16), ColorSpaceDeviceRGB));
// Our text should end up 50% transparent blue-green.
Color fullResult(0x80008080);
{
TransparencyWin helper;
helper.init(src->context(),
TransparencyWin::TextComposite,
TransparencyWin::KeepTransform,
IntRect(0, 0, 16, 16));
helper.setTextCompositeColor(fullResult);
// Write several different squares to simulate ClearType. These should
// all reduce to 2/3 coverage.
FloatRect pixel(0, 0, 1, 1);
helper.context()->fillRect(pixel, 0xFFFF0000, ColorSpaceDeviceRGB);
pixel.move(1.0f, 0.0f);
helper.context()->fillRect(pixel, 0xFF00FF00, ColorSpaceDeviceRGB);
pixel.move(1.0f, 0.0f);
helper.context()->fillRect(pixel, 0xFF0000FF, ColorSpaceDeviceRGB);
pixel.move(1.0f, 0.0f);
helper.context()->fillRect(pixel, 0xFF008080, ColorSpaceDeviceRGB);
pixel.move(1.0f, 0.0f);
helper.context()->fillRect(pixel, 0xFF800080, ColorSpaceDeviceRGB);
pixel.move(1.0f, 0.0f);
helper.context()->fillRect(pixel, 0xFF808000, ColorSpaceDeviceRGB);
// Try one with 100% coverage (opaque black).
pixel.move(1.0f, 0.0f);
helper.context()->fillRect(pixel, 0xFF000000, ColorSpaceDeviceRGB);
// Now mess with the alpha channel.
clearTopLayerAlphaChannel(helper.context());
helper.composite();
}
Color oneThirdResult(0x55005555); // = fullResult * 2 / 3
EXPECT_EQ(oneThirdResult, getPixelAt(src->context(), 0, 0));
EXPECT_EQ(oneThirdResult, getPixelAt(src->context(), 1, 0));
EXPECT_EQ(oneThirdResult, getPixelAt(src->context(), 2, 0));
EXPECT_EQ(oneThirdResult, getPixelAt(src->context(), 3, 0));
EXPECT_EQ(oneThirdResult, getPixelAt(src->context(), 4, 0));
EXPECT_EQ(oneThirdResult, getPixelAt(src->context(), 5, 0));
EXPECT_EQ(fullResult, getPixelAt(src->context(), 6, 0));
EXPECT_EQ(Color::transparent, getPixelAt(src->context(), 7, 0));
}
} // namespace WebCore