зеркало из https://github.com/mozilla/gecko-dev.git
105 строки
3.6 KiB
C++
105 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsCSSRenderingGradients_h__
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#define nsCSSRenderingGradients_h__
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#include "nsLayoutUtils.h"
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#include "nsStyleStruct.h"
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#include "Units.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/gfx/2D.h"
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namespace mozilla {
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namespace layers {
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class StackingContextHelper;
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class WebRenderDisplayItemLayer;
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} // namespace layers
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namespace wr {
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class DisplayListBuilder;
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} // namespace wr
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// A resolved color stop, with a specific position along the gradient line and
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// a color.
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struct ColorStop {
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ColorStop(): mPosition(0), mIsMidpoint(false) {}
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ColorStop(double aPosition, bool aIsMidPoint, const gfx::Color& aColor) :
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mPosition(aPosition), mIsMidpoint(aIsMidPoint), mColor(aColor) {}
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double mPosition; // along the gradient line; 0=start, 1=end
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bool mIsMidpoint;
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gfx::Color mColor;
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};
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class nsCSSGradientRenderer final {
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public:
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/**
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* Prepare a nsCSSGradientRenderer for a gradient for an element.
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* aIntrinsicSize - the size of the source gradient.
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*/
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static nsCSSGradientRenderer Create(nsPresContext* aPresContext,
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nsStyleGradient* aGradient,
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const nsSize& aIntrinsiceSize);
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/**
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* Draw the gradient to aContext
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* aDest - where the first tile of gradient is
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* aFill - the area to be filled with tiles of aDest
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* aSrc - the area of the gradient that will fill aDest
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* aRepeatSize - the distance from the origin of a tile
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* to the next origin of a tile
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* aDirtyRect - pixels outside of this area may be skipped
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*/
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void Paint(gfxContext& aContext,
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const nsRect& aDest,
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const nsRect& aFill,
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const nsSize& aRepeatSize,
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const mozilla::CSSIntRect& aSrc,
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const nsRect& aDirtyRect,
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float aOpacity = 1.0);
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/**
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* Collect the gradient parameters
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*/
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void BuildWebRenderParameters(float aOpacity,
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wr::ExtendMode& aMode,
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nsTArray<wr::GradientStop>& aStops,
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LayoutDevicePoint& aLineStart,
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LayoutDevicePoint& aLineEnd,
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LayoutDeviceSize& aGradientRadius);
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/**
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* Build display items for the gradient
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* aLayer - the layer to make this display item relative to
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* aDest - where the first tile of gradient is
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* aFill - the area to be filled with tiles of aDest
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* aRepeatSize - the distance from the origin of a tile
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* to the next origin of a tile
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* aSrc - the area of the gradient that will fill aDest
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*/
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void BuildWebRenderDisplayItems(wr::DisplayListBuilder& aBuilder,
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const layers::StackingContextHelper& aSc,
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layers::WebRenderDisplayItemLayer* aLayer,
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const nsRect& aDest,
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const nsRect& aFill,
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const nsSize& aRepeatSize,
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const mozilla::CSSIntRect& aSrc,
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float aOpacity = 1.0);
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private:
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nsCSSGradientRenderer() {}
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nsPresContext* mPresContext;
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nsStyleGradient* mGradient;
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nsTArray<ColorStop> mStops;
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gfxPoint mLineStart, mLineEnd;
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double mRadiusX, mRadiusY;
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};
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} // namespace mozilla
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#endif /* nsCSSRenderingGradients_h__ */
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