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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp')
-rw-r--r-- | Source/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/Source/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp b/Source/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp new file mode 100644 index 0000000..6529482 --- /dev/null +++ b/Source/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp @@ -0,0 +1,221 @@ +/* + * 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 "PlatformThemeChromiumGtk.h" + +namespace WebCore { + +unsigned PlatformThemeChromiumGtk::s_thumbInactiveColor = 0xeaeaea; +unsigned PlatformThemeChromiumGtk::s_thumbActiveColor = 0xf4f4f4; +unsigned PlatformThemeChromiumGtk::s_trackColor = 0xd3d3d3; + +void PlatformThemeChromiumGtk::setScrollbarColors( + SkColor inactiveColor, SkColor activeColor, SkColor trackColor) +{ + s_thumbInactiveColor = inactiveColor; + s_thumbActiveColor = activeColor; + s_trackColor = trackColor; +} + +static SkScalar clamp(SkScalar value, SkScalar min, SkScalar max) +{ + return std::min(std::max(value, min), max); +} + +SkColor PlatformThemeChromiumGtk::saturateAndBrighten(const SkScalar hsv[3], SkScalar saturateAmount, SkScalar brightenAmount) +{ + SkScalar color[3]; + color[0] = hsv[0]; + color[1] = clamp(hsv[1] + saturateAmount, 0.0, 1.0); + color[2] = clamp(hsv[2] + brightenAmount, 0.0, 1.0); + return SkHSVToColor(color); +} + +SkColor PlatformThemeChromiumGtk::outlineColor(const SkScalar hsv1[3], const SkScalar hsv2[3]) +{ + // GTK Theme engines have way too much control over the layout of + // the scrollbar. We might be able to more closely approximate its + // look-and-feel, if we sent whole images instead of just colors + // from the browser to the renderer. But even then, some themes + // would just break. + // + // So, instead, we don't even try to 100% replicate the look of + // the native scrollbar. We render our own version, but we make + // sure to pick colors that blend in nicely with the system GTK + // theme. In most cases, we can just sample a couple of pixels + // from the system scrollbar and use those colors to draw our + // scrollbar. + // + // This works fine for the track color and the overall thumb + // color. But it fails spectacularly for the outline color used + // around the thumb piece. Not all themes have a clearly defined + // outline. For some of them it is partially transparent, and for + // others the thickness is very unpredictable. + // + // So, instead of trying to approximate the system theme, we + // instead try to compute a reasonable looking choice based on the + // known color of the track and the thumb piece. This is difficult + // when trying to deal both with high- and low-contrast themes, + // and both with positive and inverted themes. + // + // The following code has been tested to look OK with all of the + // default GTK themes. + SkScalar minDiff = clamp((hsv1[1] + hsv2[1]) * 1.2, 0.28, 0.5); + SkScalar diff = clamp(fabs(hsv1[2] - hsv2[2]) / 2, minDiff, 0.5); + + if (hsv1[2] + hsv2[2] > 1.0) + diff = -diff; + + return saturateAndBrighten(hsv2, -0.2, diff); +} + +void PlatformThemeChromiumGtk::paintArrowButton(GraphicsContext* gc, const IntRect& rect, ArrowDirection direction, ControlStates states) +{ + SkCanvas* const canvas = gc->platformContext()->canvas(); + int widthMiddle, lengthMiddle; + SkPaint paint; + if (direction == North || direction == South) { + widthMiddle = rect.width() / 2 + 1; + lengthMiddle = rect.height() / 2 + 1; + } else { + lengthMiddle = rect.width() / 2 + 1; + widthMiddle = rect.height() / 2 + 1; + } + + // Calculate button color. + SkScalar trackHSV[3]; + SkColorToHSV(trackColor(), trackHSV); + SkColor buttonColor = saturateAndBrighten(trackHSV, 0, 0.2); + SkColor backgroundColor = buttonColor; + if (states & PressedState) { + SkScalar buttonHSV[3]; + SkColorToHSV(buttonColor, buttonHSV); + buttonColor = saturateAndBrighten(buttonHSV, 0, -0.1); + } else if (states & HoverState) { + SkScalar buttonHSV[3]; + SkColorToHSV(buttonColor, buttonHSV); + buttonColor = saturateAndBrighten(buttonHSV, 0, 0.05); + } + + SkIRect skrect; + skrect.set(rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height()); + // Paint the background (the area visible behind the rounded corners). + paint.setColor(backgroundColor); + canvas->drawIRect(skrect, paint); + + // Paint the button's outline and fill the middle + SkPath outline; + switch (direction) { + case North: + outline.moveTo(rect.x() + 0.5, rect.y() + rect.height() + 0.5); + outline.rLineTo(0, -(rect.height() - 2)); + outline.rLineTo(2, -2); + outline.rLineTo(rect.width() - 5, 0); + outline.rLineTo(2, 2); + outline.rLineTo(0, rect.height() - 2); + break; + case South: + outline.moveTo(rect.x() + 0.5, rect.y() - 0.5); + outline.rLineTo(0, rect.height() - 2); + outline.rLineTo(2, 2); + outline.rLineTo(rect.width() - 5, 0); + outline.rLineTo(2, -2); + outline.rLineTo(0, -(rect.height() - 2)); + break; + case East: + outline.moveTo(rect.x() - 0.5, rect.y() + 0.5); + outline.rLineTo(rect.width() - 2, 0); + outline.rLineTo(2, 2); + outline.rLineTo(0, rect.height() - 5); + outline.rLineTo(-2, 2); + outline.rLineTo(-(rect.width() - 2), 0); + break; + case West: + outline.moveTo(rect.x() + rect.width() + 0.5, rect.y() + 0.5); + outline.rLineTo(-(rect.width() - 2), 0); + outline.rLineTo(-2, 2); + outline.rLineTo(0, rect.height() - 5); + outline.rLineTo(2, 2); + outline.rLineTo(rect.width() - 2, 0); + break; + } + outline.close(); + + paint.setStyle(SkPaint::kFill_Style); + paint.setColor(buttonColor); + canvas->drawPath(outline, paint); + + paint.setAntiAlias(true); + paint.setStyle(SkPaint::kStroke_Style); + SkScalar thumbHSV[3]; + SkColorToHSV(thumbInactiveColor(), thumbHSV); + paint.setColor(outlineColor(trackHSV, thumbHSV)); + canvas->drawPath(outline, paint); + + // If the button is disabled or read-only, the arrow is drawn with the outline color. + if (states & EnabledState && !(states & ReadOnlyState)) + paint.setColor(SK_ColorBLACK); + + paint.setAntiAlias(false); + paint.setStyle(SkPaint::kFill_Style); + + SkPath path; + // The constants in this block of code are hand-tailored to produce good + // looking arrows without anti-aliasing. + switch (direction) { + case North: + path.moveTo(rect.x() + widthMiddle - 4, rect.y() + lengthMiddle + 2); + path.rLineTo(7, 0); + path.rLineTo(-4, -4); + break; + case South: + path.moveTo(rect.x() + widthMiddle - 4, rect.y() + lengthMiddle - 3); + path.rLineTo(7, 0); + path.rLineTo(-4, 4); + break; + case East: + path.moveTo(rect.x() + lengthMiddle - 3, rect.y() + widthMiddle - 4); + path.rLineTo(0, 7); + path.rLineTo(4, -4); + break; + case West: + path.moveTo(rect.x() + lengthMiddle + 1, rect.y() + widthMiddle - 5); + path.rLineTo(0, 9); + path.rLineTo(-4, -4); + break; + } + path.close(); + + canvas->drawPath(path, paint); +} + +} // namespace WebCore + |