749 lines
24 KiB
C++
749 lines
24 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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// Main header first:
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#include "nsSVGPatternFrame.h"
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// Keep others in (case-insensitive) order:
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#include "gfx2DGlue.h"
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#include "gfxContext.h"
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#include "gfxMatrix.h"
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#include "gfxPattern.h"
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#include "gfxPlatform.h"
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#include "mozilla/gfx/2D.h"
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#include "nsContentUtils.h"
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#include "nsGkAtoms.h"
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#include "nsISVGChildFrame.h"
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#include "nsStyleContext.h"
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#include "nsSVGEffects.h"
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#include "nsSVGPathGeometryFrame.h"
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#include "mozilla/dom/SVGPatternElement.h"
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#include "nsSVGUtils.h"
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#include "nsSVGAnimatedTransformList.h"
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#include "SVGContentUtils.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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//----------------------------------------------------------------------
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// Helper classes
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class MOZ_RAII nsSVGPatternFrame::AutoPatternReferencer
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{
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public:
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explicit AutoPatternReferencer(nsSVGPatternFrame *aFrame
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MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mFrame(aFrame)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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// Reference loops should normally be detected in advance and handled, so
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// we're not expecting to encounter them here
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MOZ_ASSERT(!mFrame->mLoopFlag, "Undetected reference loop!");
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mFrame->mLoopFlag = true;
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}
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~AutoPatternReferencer() {
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mFrame->mLoopFlag = false;
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}
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private:
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nsSVGPatternFrame *mFrame;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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//----------------------------------------------------------------------
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// Implementation
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nsSVGPatternFrame::nsSVGPatternFrame(nsStyleContext* aContext)
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: nsSVGPaintServerFrame(aContext)
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, mLoopFlag(false)
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, mNoHRefURI(false)
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{
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsSVGPatternFrame)
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//----------------------------------------------------------------------
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// nsIFrame methods:
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nsresult
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nsSVGPatternFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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if (aNameSpaceID == kNameSpaceID_None &&
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(aAttribute == nsGkAtoms::patternUnits ||
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aAttribute == nsGkAtoms::patternContentUnits ||
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aAttribute == nsGkAtoms::patternTransform ||
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aAttribute == nsGkAtoms::x ||
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aAttribute == nsGkAtoms::y ||
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aAttribute == nsGkAtoms::width ||
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aAttribute == nsGkAtoms::height ||
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aAttribute == nsGkAtoms::preserveAspectRatio ||
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aAttribute == nsGkAtoms::viewBox)) {
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nsSVGEffects::InvalidateDirectRenderingObservers(this);
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}
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if ((aNameSpaceID == kNameSpaceID_XLink ||
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aNameSpaceID == kNameSpaceID_None) &&
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aAttribute == nsGkAtoms::href) {
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// Blow away our reference, if any
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DeleteProperty(nsSVGEffects::HrefAsPaintingProperty());
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mNoHRefURI = false;
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// And update whoever references us
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nsSVGEffects::InvalidateDirectRenderingObservers(this);
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}
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return nsSVGPaintServerFrame::AttributeChanged(aNameSpaceID,
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aAttribute, aModType);
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}
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#ifdef DEBUG
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void
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nsSVGPatternFrame::Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::pattern), "Content is not an SVG pattern");
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nsSVGPaintServerFrame::Init(aContent, aParent, aPrevInFlow);
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}
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#endif /* DEBUG */
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nsIAtom*
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nsSVGPatternFrame::GetType() const
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{
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return nsGkAtoms::svgPatternFrame;
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}
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//----------------------------------------------------------------------
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// nsSVGContainerFrame methods:
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// If our GetCanvasTM is getting called, we
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// need to return *our current* transformation
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// matrix, which depends on our units parameters
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// and X, Y, Width, and Height
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gfxMatrix
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nsSVGPatternFrame::GetCanvasTM()
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{
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if (mCTM) {
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return *mCTM;
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}
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// Do we know our rendering parent?
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if (mSource) {
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// Yes, use it!
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return mSource->GetCanvasTM();
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}
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// We get here when geometry in the <pattern> container is updated
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return gfxMatrix();
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}
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// -------------------------------------------------------------------------
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// Helper functions
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// -------------------------------------------------------------------------
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/** Calculate the maximum expansion of a matrix */
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static float
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MaxExpansion(const Matrix &aMatrix)
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{
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// maximum expansion derivation from
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// http://lists.cairographics.org/archives/cairo/2004-October/001980.html
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// and also implemented in cairo_matrix_transformed_circle_major_axis
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double a = aMatrix._11;
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double b = aMatrix._12;
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double c = aMatrix._21;
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double d = aMatrix._22;
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double f = (a * a + b * b + c * c + d * d) / 2;
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double g = (a * a + b * b - c * c - d * d) / 2;
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double h = a * c + b * d;
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return sqrt(f + sqrt(g * g + h * h));
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}
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// The SVG specification says that the 'patternContentUnits' attribute "has no effect if
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// attribute ‘viewBox’ is specified". We still need to include a bbox scale
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// if the viewBox is specified and _patternUnits_ is set to or defaults to
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// objectBoundingBox though, since in that case the viewBox is relative to the bbox
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static bool
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IncludeBBoxScale(const nsSVGViewBox& aViewBox,
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uint32_t aPatternContentUnits, uint32_t aPatternUnits)
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{
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return (!aViewBox.IsExplicitlySet() &&
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aPatternContentUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) ||
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(aViewBox.IsExplicitlySet() &&
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aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
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}
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// Given the matrix for the pattern element's own transform, this returns a
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// combined matrix including the transforms applicable to its target.
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static Matrix
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GetPatternMatrix(uint16_t aPatternUnits,
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const Matrix &patternTransform,
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const gfxRect &bbox,
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const gfxRect &callerBBox,
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const Matrix &callerCTM)
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{
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// We really want the pattern matrix to handle translations
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gfxFloat minx = bbox.X();
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gfxFloat miny = bbox.Y();
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if (aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
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minx += callerBBox.X();
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miny += callerBBox.Y();
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}
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float scale = 1.0f / MaxExpansion(callerCTM);
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Matrix patternMatrix = patternTransform;
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patternMatrix.PreScale(scale, scale);
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patternMatrix.PreTranslate(minx, miny);
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return patternMatrix;
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}
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static nsresult
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GetTargetGeometry(gfxRect *aBBox,
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const nsSVGViewBox &aViewBox,
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uint16_t aPatternContentUnits,
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uint16_t aPatternUnits,
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nsIFrame *aTarget,
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const Matrix &aContextMatrix,
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const gfxRect *aOverrideBounds)
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{
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*aBBox = aOverrideBounds ? *aOverrideBounds : nsSVGUtils::GetBBox(aTarget);
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// Sanity check
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if (IncludeBBoxScale(aViewBox, aPatternContentUnits, aPatternUnits) &&
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(aBBox->Width() <= 0 || aBBox->Height() <= 0)) {
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return NS_ERROR_FAILURE;
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}
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// OK, now fix up the bounding box to reflect user coordinates
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// We handle device unit scaling in pattern matrix
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float scale = MaxExpansion(aContextMatrix);
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if (scale <= 0) {
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return NS_ERROR_FAILURE;
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}
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aBBox->Scale(scale);
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return NS_OK;
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}
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already_AddRefed<SourceSurface>
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nsSVGPatternFrame::PaintPattern(const DrawTarget* aDrawTarget,
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Matrix* patternMatrix,
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const Matrix &aContextMatrix,
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nsIFrame *aSource,
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nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
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float aGraphicOpacity,
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const gfxRect *aOverrideBounds)
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{
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/*
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* General approach:
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* Set the content geometry stuff
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* Calculate our bbox (using x,y,width,height & patternUnits &
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* patternTransform)
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* Create the surface
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* Calculate the content transformation matrix
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* Get our children (we may need to get them from another Pattern)
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* Call SVGPaint on all of our children
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* Return
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*/
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nsSVGPatternFrame* patternWithChildren = GetPatternWithChildren();
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if (!patternWithChildren) {
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return nullptr; // Either no kids or a bad reference
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}
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nsIFrame* firstKid = patternWithChildren->mFrames.FirstChild();
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const nsSVGViewBox& viewBox = GetViewBox();
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uint16_t patternContentUnits =
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GetEnumValue(SVGPatternElement::PATTERNCONTENTUNITS);
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uint16_t patternUnits =
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GetEnumValue(SVGPatternElement::PATTERNUNITS);
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/*
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* Get the content geometry information. This is a little tricky --
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* our parent is probably a <defs>, but we are rendering in the context
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* of some geometry source. Our content geometry information needs to
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* come from our rendering parent as opposed to our content parent. We
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* get that information from aSource, which is passed to us from the
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* backend renderer.
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*
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* There are three "geometries" that we need:
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* 1) The bounding box for the pattern. We use this to get the
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* width and height for the surface, and as the return to
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* GetBBox.
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* 2) The transformation matrix for the pattern. This is not *quite*
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* the same as the canvas transformation matrix that we will
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* provide to our rendering children since we "fudge" it a little
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* to get the renderer to handle the translations correctly for us.
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* 3) The CTM that we return to our children who make up the pattern.
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*/
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// Get all of the information we need from our "caller" -- i.e.
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// the geometry that is being rendered with a pattern
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gfxRect callerBBox;
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if (NS_FAILED(GetTargetGeometry(&callerBBox,
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viewBox,
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patternContentUnits, patternUnits,
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aSource,
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aContextMatrix,
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aOverrideBounds))) {
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return nullptr;
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}
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// Construct the CTM that we will provide to our children when we
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// render them into the tile.
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gfxMatrix ctm = ConstructCTM(viewBox, patternContentUnits, patternUnits,
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callerBBox, aContextMatrix, aSource);
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if (ctm.IsSingular()) {
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return nullptr;
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}
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if (patternWithChildren->mCTM) {
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*patternWithChildren->mCTM = ctm;
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} else {
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patternWithChildren->mCTM = new gfxMatrix(ctm);
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}
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// Get the bounding box of the pattern. This will be used to determine
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// the size of the surface, and will also be used to define the bounding
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// box for the pattern tile.
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gfxRect bbox = GetPatternRect(patternUnits, callerBBox, aContextMatrix, aSource);
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if (bbox.Width() <= 0.0 || bbox.Height() <= 0.0) {
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return nullptr;
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}
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// Get the pattern transform
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Matrix patternTransform = ToMatrix(GetPatternTransform());
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// revert the vector effect transform so that the pattern appears unchanged
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if (aFillOrStroke == &nsStyleSVG::mStroke) {
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gfxMatrix userToOuterSVG;
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if (nsSVGUtils::GetNonScalingStrokeTransform(aSource, &userToOuterSVG)) {
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patternTransform *= ToMatrix(userToOuterSVG);
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if (patternTransform.IsSingular()) {
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NS_WARNING("Singular matrix painting non-scaling-stroke");
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return nullptr;
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}
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}
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}
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// Get the transformation matrix that we will hand to the renderer's pattern
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// routine.
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*patternMatrix = GetPatternMatrix(patternUnits, patternTransform,
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bbox, callerBBox, aContextMatrix);
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if (patternMatrix->IsSingular()) {
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return nullptr;
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}
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// Now that we have all of the necessary geometries, we can
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// create our surface.
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gfxRect transformedBBox = ThebesRect(patternTransform.TransformBounds(ToRect(bbox)));
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bool resultOverflows;
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IntSize surfaceSize =
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nsSVGUtils::ConvertToSurfaceSize(
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transformedBBox.Size(), &resultOverflows);
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// 0 disables rendering, < 0 is an error
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if (surfaceSize.width <= 0 || surfaceSize.height <= 0) {
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return nullptr;
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}
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gfxFloat patternWidth = bbox.Width();
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gfxFloat patternHeight = bbox.Height();
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if (resultOverflows ||
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patternWidth != surfaceSize.width ||
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patternHeight != surfaceSize.height) {
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// scale drawing to pattern surface size
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gfxMatrix tempTM =
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gfxMatrix(surfaceSize.width / patternWidth, 0.0,
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0.0, surfaceSize.height / patternHeight,
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0.0, 0.0);
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patternWithChildren->mCTM->PreMultiply(tempTM);
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// and rescale pattern to compensate
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patternMatrix->PreScale(patternWidth / surfaceSize.width,
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patternHeight / surfaceSize.height);
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}
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RefPtr<DrawTarget> dt =
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aDrawTarget->CreateSimilarDrawTarget(surfaceSize, SurfaceFormat::B8G8R8A8);
|
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if (!dt || !dt->IsValid()) {
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return nullptr;
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}
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dt->ClearRect(Rect(0, 0, surfaceSize.width, surfaceSize.height));
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RefPtr<gfxContext> gfx = gfxContext::CreateOrNull(dt);
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MOZ_ASSERT(gfx); // already checked the draw target above
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if (aGraphicOpacity != 1.0f) {
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gfx->Save();
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gfx->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, aGraphicOpacity);
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}
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// OK, now render -- note that we use "firstKid", which
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// we got at the beginning because it takes care of the
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// referenced pattern situation for us
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if (aSource->IsFrameOfType(nsIFrame::eSVGGeometry)) {
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// Set the geometrical parent of the pattern we are rendering
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patternWithChildren->mSource = static_cast<nsSVGPathGeometryFrame*>(aSource);
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}
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|
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// Delay checking NS_FRAME_DRAWING_AS_PAINTSERVER bit until here so we can
|
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// give back a clear surface if there's a loop
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if (!(patternWithChildren->GetStateBits() & NS_FRAME_DRAWING_AS_PAINTSERVER)) {
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patternWithChildren->AddStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
|
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for (nsIFrame* kid = firstKid; kid;
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kid = kid->GetNextSibling()) {
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// The CTM of each frame referencing us can be different
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nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
|
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if (SVGFrame) {
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SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
|
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}
|
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gfxMatrix tm = *(patternWithChildren->mCTM);
|
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if (kid->GetContent()->IsSVGElement()) {
|
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tm = static_cast<nsSVGElement*>(kid->GetContent())->
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PrependLocalTransformsTo(tm, eUserSpaceToParent);
|
||
}
|
||
Unused << nsSVGUtils::PaintFrameWithEffects(kid, *gfx, tm);
|
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}
|
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patternWithChildren->RemoveStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
|
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}
|
||
|
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patternWithChildren->mSource = nullptr;
|
||
|
||
if (aGraphicOpacity != 1.0f) {
|
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gfx->PopGroupAndBlend();
|
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gfx->Restore();
|
||
}
|
||
|
||
// caller now owns the surface
|
||
return dt->Snapshot();
|
||
}
|
||
|
||
/* Will probably need something like this... */
|
||
// How do we handle the insertion of a new frame?
|
||
// We really don't want to rerender this every time,
|
||
// do we?
|
||
nsSVGPatternFrame*
|
||
nsSVGPatternFrame::GetPatternWithChildren()
|
||
{
|
||
// Do we have any children ourselves?
|
||
if (!mFrames.IsEmpty())
|
||
return this;
|
||
|
||
// No, see if we chain to someone who does
|
||
AutoPatternReferencer patternRef(this);
|
||
|
||
nsSVGPatternFrame* next = GetReferencedPatternIfNotInUse();
|
||
if (!next)
|
||
return nullptr;
|
||
|
||
return next->GetPatternWithChildren();
|
||
}
|
||
|
||
uint16_t
|
||
nsSVGPatternFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
|
||
{
|
||
nsSVGEnum& thisEnum =
|
||
static_cast<SVGPatternElement *>(mContent)->mEnumAttributes[aIndex];
|
||
|
||
if (thisEnum.IsExplicitlySet())
|
||
return thisEnum.GetAnimValue();
|
||
|
||
AutoPatternReferencer patternRef(this);
|
||
|
||
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
|
||
return next ? next->GetEnumValue(aIndex, aDefault) :
|
||
static_cast<SVGPatternElement *>(aDefault)->
|
||
mEnumAttributes[aIndex].GetAnimValue();
|
||
}
|
||
|
||
nsSVGAnimatedTransformList*
|
||
nsSVGPatternFrame::GetPatternTransformList(nsIContent* aDefault)
|
||
{
|
||
nsSVGAnimatedTransformList *thisTransformList =
|
||
static_cast<SVGPatternElement *>(mContent)->GetAnimatedTransformList();
|
||
|
||
if (thisTransformList && thisTransformList->IsExplicitlySet())
|
||
return thisTransformList;
|
||
|
||
AutoPatternReferencer patternRef(this);
|
||
|
||
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
|
||
return next ? next->GetPatternTransformList(aDefault) :
|
||
static_cast<SVGPatternElement *>(aDefault)->mPatternTransform.get();
|
||
}
|
||
|
||
gfxMatrix
|
||
nsSVGPatternFrame::GetPatternTransform()
|
||
{
|
||
nsSVGAnimatedTransformList* animTransformList =
|
||
GetPatternTransformList(mContent);
|
||
if (!animTransformList)
|
||
return gfxMatrix();
|
||
|
||
return animTransformList->GetAnimValue().GetConsolidationMatrix();
|
||
}
|
||
|
||
const nsSVGViewBox &
|
||
nsSVGPatternFrame::GetViewBox(nsIContent* aDefault)
|
||
{
|
||
const nsSVGViewBox &thisViewBox =
|
||
static_cast<SVGPatternElement *>(mContent)->mViewBox;
|
||
|
||
if (thisViewBox.IsExplicitlySet())
|
||
return thisViewBox;
|
||
|
||
AutoPatternReferencer patternRef(this);
|
||
|
||
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
|
||
return next ? next->GetViewBox(aDefault) :
|
||
static_cast<SVGPatternElement *>(aDefault)->mViewBox;
|
||
}
|
||
|
||
const SVGAnimatedPreserveAspectRatio &
|
||
nsSVGPatternFrame::GetPreserveAspectRatio(nsIContent *aDefault)
|
||
{
|
||
const SVGAnimatedPreserveAspectRatio &thisPar =
|
||
static_cast<SVGPatternElement *>(mContent)->mPreserveAspectRatio;
|
||
|
||
if (thisPar.IsExplicitlySet())
|
||
return thisPar;
|
||
|
||
AutoPatternReferencer patternRef(this);
|
||
|
||
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
|
||
return next ? next->GetPreserveAspectRatio(aDefault) :
|
||
static_cast<SVGPatternElement *>(aDefault)->mPreserveAspectRatio;
|
||
}
|
||
|
||
const nsSVGLength2 *
|
||
nsSVGPatternFrame::GetLengthValue(uint32_t aIndex, nsIContent *aDefault)
|
||
{
|
||
const nsSVGLength2 *thisLength =
|
||
&static_cast<SVGPatternElement *>(mContent)->mLengthAttributes[aIndex];
|
||
|
||
if (thisLength->IsExplicitlySet())
|
||
return thisLength;
|
||
|
||
AutoPatternReferencer patternRef(this);
|
||
|
||
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
|
||
return next ? next->GetLengthValue(aIndex, aDefault) :
|
||
&static_cast<SVGPatternElement *>(aDefault)->mLengthAttributes[aIndex];
|
||
}
|
||
|
||
// Private (helper) methods
|
||
nsSVGPatternFrame *
|
||
nsSVGPatternFrame::GetReferencedPattern()
|
||
{
|
||
if (mNoHRefURI)
|
||
return nullptr;
|
||
|
||
nsSVGPaintingProperty *property =
|
||
GetProperty(nsSVGEffects::HrefAsPaintingProperty());
|
||
|
||
if (!property) {
|
||
// Fetch our pattern element's href or xlink:href attribute
|
||
SVGPatternElement *pattern = static_cast<SVGPatternElement *>(mContent);
|
||
nsAutoString href;
|
||
if (pattern->mStringAttributes[SVGPatternElement::HREF].IsExplicitlySet()) {
|
||
pattern->mStringAttributes[SVGPatternElement::HREF]
|
||
.GetAnimValue(href, pattern);
|
||
} else {
|
||
pattern->mStringAttributes[SVGPatternElement::XLINK_HREF]
|
||
.GetAnimValue(href, pattern);
|
||
}
|
||
|
||
if (href.IsEmpty()) {
|
||
mNoHRefURI = true;
|
||
return nullptr; // no URL
|
||
}
|
||
|
||
// Convert href to an nsIURI
|
||
nsCOMPtr<nsIURI> targetURI;
|
||
nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
|
||
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
|
||
mContent->GetUncomposedDoc(), base);
|
||
|
||
property =
|
||
nsSVGEffects::GetPaintingProperty(targetURI, this,
|
||
nsSVGEffects::HrefAsPaintingProperty());
|
||
if (!property)
|
||
return nullptr;
|
||
}
|
||
|
||
nsIFrame *result = property->GetReferencedFrame();
|
||
if (!result)
|
||
return nullptr;
|
||
|
||
nsIAtom* frameType = result->GetType();
|
||
if (frameType != nsGkAtoms::svgPatternFrame)
|
||
return nullptr;
|
||
|
||
return static_cast<nsSVGPatternFrame*>(result);
|
||
}
|
||
|
||
nsSVGPatternFrame *
|
||
nsSVGPatternFrame::GetReferencedPatternIfNotInUse()
|
||
{
|
||
nsSVGPatternFrame *referenced = GetReferencedPattern();
|
||
if (!referenced)
|
||
return nullptr;
|
||
|
||
if (referenced->mLoopFlag) {
|
||
// XXXjwatt: we should really send an error to the JavaScript Console here:
|
||
NS_WARNING("pattern reference loop detected while inheriting attribute!");
|
||
return nullptr;
|
||
}
|
||
|
||
return referenced;
|
||
}
|
||
|
||
gfxRect
|
||
nsSVGPatternFrame::GetPatternRect(uint16_t aPatternUnits,
|
||
const gfxRect &aTargetBBox,
|
||
const Matrix &aTargetCTM,
|
||
nsIFrame *aTarget)
|
||
{
|
||
// We need to initialize our box
|
||
float x,y,width,height;
|
||
|
||
// Get the pattern x,y,width, and height
|
||
const nsSVGLength2 *tmpX, *tmpY, *tmpHeight, *tmpWidth;
|
||
tmpX = GetLengthValue(SVGPatternElement::ATTR_X);
|
||
tmpY = GetLengthValue(SVGPatternElement::ATTR_Y);
|
||
tmpHeight = GetLengthValue(SVGPatternElement::ATTR_HEIGHT);
|
||
tmpWidth = GetLengthValue(SVGPatternElement::ATTR_WIDTH);
|
||
|
||
if (aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
|
||
x = nsSVGUtils::ObjectSpace(aTargetBBox, tmpX);
|
||
y = nsSVGUtils::ObjectSpace(aTargetBBox, tmpY);
|
||
width = nsSVGUtils::ObjectSpace(aTargetBBox, tmpWidth);
|
||
height = nsSVGUtils::ObjectSpace(aTargetBBox, tmpHeight);
|
||
} else {
|
||
float scale = MaxExpansion(aTargetCTM);
|
||
x = nsSVGUtils::UserSpace(aTarget, tmpX) * scale;
|
||
y = nsSVGUtils::UserSpace(aTarget, tmpY) * scale;
|
||
width = nsSVGUtils::UserSpace(aTarget, tmpWidth) * scale;
|
||
height = nsSVGUtils::UserSpace(aTarget, tmpHeight) * scale;
|
||
}
|
||
|
||
return gfxRect(x, y, width, height);
|
||
}
|
||
|
||
gfxMatrix
|
||
nsSVGPatternFrame::ConstructCTM(const nsSVGViewBox& aViewBox,
|
||
uint16_t aPatternContentUnits,
|
||
uint16_t aPatternUnits,
|
||
const gfxRect &callerBBox,
|
||
const Matrix &callerCTM,
|
||
nsIFrame *aTarget)
|
||
{
|
||
SVGSVGElement *ctx = nullptr;
|
||
nsIContent* targetContent = aTarget->GetContent();
|
||
gfxFloat scaleX, scaleY;
|
||
|
||
// The objectBoundingBox conversion must be handled in the CTM:
|
||
if (IncludeBBoxScale(aViewBox, aPatternContentUnits, aPatternUnits)) {
|
||
scaleX = callerBBox.Width();
|
||
scaleY = callerBBox.Height();
|
||
} else {
|
||
if (targetContent->IsSVGElement()) {
|
||
ctx = static_cast<nsSVGElement*>(targetContent)->GetCtx();
|
||
}
|
||
scaleX = scaleY = MaxExpansion(callerCTM);
|
||
}
|
||
|
||
if (!aViewBox.IsExplicitlySet()) {
|
||
return gfxMatrix(scaleX, 0.0, 0.0, scaleY, 0.0, 0.0);
|
||
}
|
||
const nsSVGViewBoxRect viewBoxRect = aViewBox.GetAnimValue();
|
||
|
||
if (viewBoxRect.height <= 0.0f || viewBoxRect.width <= 0.0f) {
|
||
return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
|
||
}
|
||
|
||
float viewportWidth, viewportHeight;
|
||
if (targetContent->IsSVGElement()) {
|
||
// If we're dealing with an SVG target only retrieve the context once.
|
||
// Calling the nsIFrame* variant of GetAnimValue would look it up on
|
||
// every call.
|
||
viewportWidth =
|
||
GetLengthValue(SVGPatternElement::ATTR_WIDTH)->GetAnimValue(ctx);
|
||
viewportHeight =
|
||
GetLengthValue(SVGPatternElement::ATTR_HEIGHT)->GetAnimValue(ctx);
|
||
} else {
|
||
// No SVG target, call the nsIFrame* variant of GetAnimValue.
|
||
viewportWidth =
|
||
GetLengthValue(SVGPatternElement::ATTR_WIDTH)->GetAnimValue(aTarget);
|
||
viewportHeight =
|
||
GetLengthValue(SVGPatternElement::ATTR_HEIGHT)->GetAnimValue(aTarget);
|
||
}
|
||
|
||
if (viewportWidth <= 0.0f || viewportHeight <= 0.0f) {
|
||
return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
|
||
}
|
||
|
||
Matrix tm = SVGContentUtils::GetViewBoxTransform(
|
||
viewportWidth * scaleX, viewportHeight * scaleY,
|
||
viewBoxRect.x, viewBoxRect.y,
|
||
viewBoxRect.width, viewBoxRect.height,
|
||
GetPreserveAspectRatio());
|
||
|
||
return ThebesMatrix(tm);
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// nsSVGPaintServerFrame methods:
|
||
|
||
already_AddRefed<gfxPattern>
|
||
nsSVGPatternFrame::GetPaintServerPattern(nsIFrame *aSource,
|
||
const DrawTarget* aDrawTarget,
|
||
const gfxMatrix& aContextMatrix,
|
||
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
|
||
float aGraphicOpacity,
|
||
const gfxRect *aOverrideBounds)
|
||
{
|
||
if (aGraphicOpacity == 0.0f) {
|
||
RefPtr<gfxPattern> pattern = new gfxPattern(Color());
|
||
return pattern.forget();
|
||
}
|
||
|
||
// Paint it!
|
||
Matrix pMatrix;
|
||
RefPtr<SourceSurface> surface =
|
||
PaintPattern(aDrawTarget, &pMatrix, ToMatrix(aContextMatrix), aSource,
|
||
aFillOrStroke, aGraphicOpacity, aOverrideBounds);
|
||
|
||
if (!surface) {
|
||
return nullptr;
|
||
}
|
||
|
||
RefPtr<gfxPattern> pattern = new gfxPattern(surface, pMatrix);
|
||
|
||
if (!pattern || pattern->CairoStatus())
|
||
return nullptr;
|
||
|
||
pattern->SetExtend(ExtendMode::REPEAT);
|
||
return pattern.forget();
|
||
}
|
||
|
||
// -------------------------------------------------------------------------
|
||
// Public functions
|
||
// -------------------------------------------------------------------------
|
||
|
||
nsIFrame* NS_NewSVGPatternFrame(nsIPresShell* aPresShell,
|
||
nsStyleContext* aContext)
|
||
{
|
||
return new (aPresShell) nsSVGPatternFrame(aContext);
|
||
}
|
||
|