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/*
* Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "core/layout/svg/LayoutSVGResourcePaintServer.h"
#include "core/layout/svg/SVGResources.h"
#include "core/layout/svg/SVGResourcesCache.h"
#include "core/style/ComputedStyle.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "third_party/skia/include/core/SkPaint.h"
namespace blink {
SVGPaintServer::SVGPaintServer(Color color) : m_color(color) {}
SVGPaintServer::SVGPaintServer(PassRefPtr<Gradient> gradient,
const AffineTransform& transform)
: m_gradient(gradient), m_transform(transform), m_color(Color::black) {}
SVGPaintServer::SVGPaintServer(PassRefPtr<Pattern> pattern,
const AffineTransform& transform)
: m_pattern(pattern), m_transform(transform), m_color(Color::black) {}
void SVGPaintServer::applyToSkPaint(SkPaint& paint, float paintAlpha) {
SkColor baseColor = m_gradient || m_pattern ? SK_ColorBLACK : m_color.rgb();
paint.setColor(scaleAlpha(baseColor, paintAlpha));
if (m_pattern) {
m_pattern->applyToPaint(paint, affineTransformToSkMatrix(m_transform));
} else if (m_gradient) {
m_gradient->applyToPaint(paint, affineTransformToSkMatrix(m_transform));
} else {
paint.setShader(nullptr);
}
}
void SVGPaintServer::prependTransform(const AffineTransform& transform) {
ASSERT(m_gradient || m_pattern);
m_transform = transform * m_transform;
}
static SVGPaintDescription requestPaint(const LayoutObject& object,
const ComputedStyle& style,
LayoutSVGResourceMode mode) {
// If we have no style at all, ignore it.
const SVGComputedStyle& svgStyle = style.svgStyle();
// If we have no fill/stroke, return 0.
if (mode == ApplyToFillMode) {
if (!svgStyle.hasFill())
return SVGPaintDescription();
} else {
if (!svgStyle.hasStroke())
return SVGPaintDescription();
}
bool applyToFill = mode == ApplyToFillMode;
SVGPaintType paintType =
applyToFill ? svgStyle.fillPaintType() : svgStyle.strokePaintType();
ASSERT(paintType != SVG_PAINTTYPE_NONE);
Color color;
bool hasColor = false;
switch (paintType) {
case SVG_PAINTTYPE_CURRENTCOLOR:
case SVG_PAINTTYPE_URI_CURRENTCOLOR:
// The keyword `currentcolor` takes its value from the value of the
// `color` property on the same element.
color = style.visitedDependentColor(CSSPropertyColor);
hasColor = true;
break;
case SVG_PAINTTYPE_RGBCOLOR:
case SVG_PAINTTYPE_URI_RGBCOLOR:
color =
applyToFill ? svgStyle.fillPaintColor() : svgStyle.strokePaintColor();
hasColor = true;
default:
break;
}
if (style.insideLink() == EInsideLink::kInsideVisitedLink) {
// FIXME: This code doesn't support the uri component of the visited link
// paint, https://bugs.webkit.org/show_bug.cgi?id=70006
SVGPaintType visitedPaintType = applyToFill
? svgStyle.visitedLinkFillPaintType()
: svgStyle.visitedLinkStrokePaintType();
// For SVG_PAINTTYPE_CURRENTCOLOR, 'color' already contains the
// 'visitedColor'.
if (visitedPaintType < SVG_PAINTTYPE_URI_NONE &&
visitedPaintType != SVG_PAINTTYPE_CURRENTCOLOR) {
const Color& visitedColor = applyToFill
? svgStyle.visitedLinkFillPaintColor()
: svgStyle.visitedLinkStrokePaintColor();
color = Color(visitedColor.red(), visitedColor.green(),
visitedColor.blue(), color.alpha());
hasColor = true;
}
}
// If the primary resource is just a color, return immediately.
if (paintType < SVG_PAINTTYPE_URI_NONE) {
// |paintType| will be either <current-color> or <rgb-color> here - both of
// which will have a color.
ASSERT(hasColor);
return SVGPaintDescription(color);
}
LayoutSVGResourcePaintServer* uriResource = nullptr;
if (SVGResources* resources =
SVGResourcesCache::cachedResourcesForLayoutObject(&object))
uriResource = applyToFill ? resources->fill() : resources->stroke();
// If the requested resource is not available, return the color resource or
// 'none'.
if (!uriResource) {
// The fallback is 'none'. (SVG2 say 'none' is implied when no fallback is
// specified.)
if (paintType == SVG_PAINTTYPE_URI_NONE || !hasColor)
return SVGPaintDescription();
return SVGPaintDescription(color);
}
// The paint server resource exists, though it may be invalid (pattern with
// width/height=0). Return the fallback color to our caller so it can use it,
// if preparePaintServer() on the resource container failed.
if (hasColor)
return SVGPaintDescription(uriResource, color);
return SVGPaintDescription(uriResource);
}
SVGPaintServer SVGPaintServer::requestForLayoutObject(
const LayoutObject& layoutObject,
const ComputedStyle& style,
LayoutSVGResourceMode resourceMode) {
ASSERT(resourceMode == ApplyToFillMode || resourceMode == ApplyToStrokeMode);
SVGPaintDescription paintDescription =
requestPaint(layoutObject, style, resourceMode);
if (!paintDescription.isValid)
return invalid();
if (!paintDescription.resource)
return SVGPaintServer(paintDescription.color);
SVGPaintServer paintServer =
paintDescription.resource->preparePaintServer(layoutObject);
if (paintServer.isValid())
return paintServer;
if (paintDescription.hasFallback)
return SVGPaintServer(paintDescription.color);
return invalid();
}
bool SVGPaintServer::existsForLayoutObject(const LayoutObject& layoutObject,
const ComputedStyle& style,
LayoutSVGResourceMode resourceMode) {
return requestPaint(layoutObject, style, resourceMode).isValid;
}
LayoutSVGResourcePaintServer::LayoutSVGResourcePaintServer(SVGElement* element)
: LayoutSVGResourceContainer(element) {}
LayoutSVGResourcePaintServer::~LayoutSVGResourcePaintServer() {}
SVGPaintDescription LayoutSVGResourcePaintServer::requestPaintDescription(
const LayoutObject& layoutObject,
const ComputedStyle& style,
LayoutSVGResourceMode resourceMode) {
return requestPaint(layoutObject, style, resourceMode);
}
} // namespace blink
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