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authorSteve Block <steveblock@google.com>2011-05-06 11:45:16 +0100
committerSteve Block <steveblock@google.com>2011-05-12 13:44:10 +0100
commitcad810f21b803229eb11403f9209855525a25d57 (patch)
tree29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp
parent121b0cf4517156d0ac5111caf9830c51b69bae8f (diff)
downloadexternal_webkit-cad810f21b803229eb11403f9209855525a25d57.zip
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Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
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-rw-r--r--WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp221
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diff --git a/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp b/WebCore/platform/chromium/PlatformThemeChromiumGtk.cpp
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-/*
- * 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
-