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Diffstat (limited to 'Source/WebKit/chromium/tests/TransparencyWinTest.cpp')
| -rw-r--r-- | Source/WebKit/chromium/tests/TransparencyWinTest.cpp | 693 |
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diff --git a/Source/WebKit/chromium/tests/TransparencyWinTest.cpp b/Source/WebKit/chromium/tests/TransparencyWinTest.cpp new file mode 100644 index 0000000..ed7f12f --- /dev/null +++ b/Source/WebKit/chromium/tests/TransparencyWinTest.cpp @@ -0,0 +1,693 @@ +/* + * Copyright (C) 2010 Google Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * 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. + * * Neither the name of Google Inc. nor the names of its + * 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 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * 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) +{ + skia::PlatformCanvas* canvas = context->platformContext()->canvas(); + HDC dc = canvas->beginPlatformPaint(); + + 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))); + + canvas->endPlatformPaint(); +} + +static Color getPixelAt(GraphicsContext* context, int x, int y) +{ + const SkBitmap& bitmap = context->platformContext()->canvas()-> + getTopPlatformDevice().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()->getTopPlatformDevice().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()->getTopPlatformDevice().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().right()); + EXPECT_EQ(8, helper.drawRect().bottom()); + + // 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()->getTopPlatformDevice(). + 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 |