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9e4b8fc70d
--HG-- rename : layout/svg/nsSVGFilterInstance.cpp => layout/svg/nsFilterInstance.cpp rename : layout/svg/nsSVGFilterInstance.h => layout/svg/nsFilterInstance.h
587 lines
19 KiB
C++
587 lines
19 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 "nsFilterInstance.h"
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// Keep others in (case-insensitive) order:
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#include "gfxPlatform.h"
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#include "gfxUtils.h"
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#include "nsISVGChildFrame.h"
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#include "nsRenderingContext.h"
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#include "nsSVGFilterInstance.h"
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#include "nsSVGFilterPaintCallback.h"
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#include "nsSVGUtils.h"
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#include "SVGContentUtils.h"
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#include "FilterSupport.h"
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#include "gfx2DGlue.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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nsresult
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nsFilterInstance::PaintFilteredFrame(nsRenderingContext *aContext,
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nsIFrame *aFilteredFrame,
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nsSVGFilterPaintCallback *aPaintCallback,
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const nsRect *aDirtyArea,
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nsIFrame* aTransformRoot)
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{
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nsFilterInstance instance(aFilteredFrame, aPaintCallback, aDirtyArea,
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nullptr, nullptr, nullptr,
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aTransformRoot);
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if (!instance.IsInitialized()) {
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return NS_OK;
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}
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return instance.Render(aContext->ThebesContext());
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}
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nsRect
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nsFilterInstance::GetPostFilterDirtyArea(nsIFrame *aFilteredFrame,
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const nsRect& aPreFilterDirtyRect)
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{
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if (aPreFilterDirtyRect.IsEmpty()) {
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return nsRect();
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}
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nsFilterInstance instance(aFilteredFrame, nullptr, nullptr,
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&aPreFilterDirtyRect);
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if (!instance.IsInitialized()) {
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return nsRect();
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}
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// We've passed in the source's dirty area so the instance knows about it.
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// Now we can ask the instance to compute the area of the filter output
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// that's dirty.
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nsRect dirtyRect;
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nsresult rv = instance.ComputePostFilterDirtyRect(&dirtyRect);
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if (NS_SUCCEEDED(rv)) {
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return dirtyRect;
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}
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return nsRect();
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}
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nsRect
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nsFilterInstance::GetPreFilterNeededArea(nsIFrame *aFilteredFrame,
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const nsRect& aPostFilterDirtyRect)
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{
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nsFilterInstance instance(aFilteredFrame, nullptr, &aPostFilterDirtyRect);
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if (!instance.IsInitialized()) {
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return nsRect();
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}
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// Now we can ask the instance to compute the area of the source
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// that's needed.
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nsRect neededRect;
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nsresult rv = instance.ComputeSourceNeededRect(&neededRect);
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if (NS_SUCCEEDED(rv)) {
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return neededRect;
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}
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return nsRect();
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}
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nsRect
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nsFilterInstance::GetPostFilterBounds(nsIFrame *aFilteredFrame,
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const gfxRect *aOverrideBBox,
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const nsRect *aPreFilterBounds)
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{
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MOZ_ASSERT(!(aFilteredFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) ||
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!(aFilteredFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY),
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"Non-display SVG do not maintain visual overflow rects");
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nsFilterInstance instance(aFilteredFrame, nullptr, nullptr,
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aPreFilterBounds, aPreFilterBounds,
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aOverrideBBox);
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if (!instance.IsInitialized()) {
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return nsRect();
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}
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nsRect bbox;
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nsresult rv = instance.ComputePostFilterExtents(&bbox);
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if (NS_SUCCEEDED(rv)) {
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return bbox;
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}
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return nsRect();
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}
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nsFilterInstance::nsFilterInstance(nsIFrame *aTargetFrame,
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nsSVGFilterPaintCallback *aPaintCallback,
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const nsRect *aPostFilterDirtyRect,
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const nsRect *aPreFilterDirtyRect,
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const nsRect *aPreFilterVisualOverflowRectOverride,
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const gfxRect *aOverrideBBox,
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nsIFrame* aTransformRoot) :
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mTargetFrame(aTargetFrame),
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mPaintCallback(aPaintCallback),
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mTransformRoot(aTransformRoot),
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mInitialized(false) {
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mTargetBBox = aOverrideBBox ?
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*aOverrideBBox : nsSVGUtils::GetBBox(mTargetFrame);
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nsresult rv = BuildPrimitives();
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if (NS_FAILED(rv)) {
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return;
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}
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if (mPrimitiveDescriptions.IsEmpty()) {
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// Nothing should be rendered.
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return;
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}
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// Get various transforms:
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gfxMatrix filterToUserSpace(mFilterRegion.Width() / mFilterSpaceBounds.width, 0.0f,
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0.0f, mFilterRegion.Height() / mFilterSpaceBounds.height,
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mFilterRegion.X(), mFilterRegion.Y());
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// Only used (so only set) when we paint:
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if (mPaintCallback) {
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mFilterSpaceToDeviceSpaceTransform = filterToUserSpace *
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nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_PAINTING);
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}
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// Convert the passed in rects from frame to filter space:
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mAppUnitsPerCSSPx = mTargetFrame->PresContext()->AppUnitsPerCSSPixel();
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mFilterSpaceToFrameSpaceInCSSPxTransform =
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filterToUserSpace * GetUserSpaceToFrameSpaceInCSSPxTransform();
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// mFilterSpaceToFrameSpaceInCSSPxTransform is always invertible
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mFrameSpaceInCSSPxToFilterSpaceTransform =
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mFilterSpaceToFrameSpaceInCSSPxTransform;
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mFrameSpaceInCSSPxToFilterSpaceTransform.Invert();
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mPostFilterDirtyRect = FrameSpaceToFilterSpace(aPostFilterDirtyRect);
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mPreFilterDirtyRect = FrameSpaceToFilterSpace(aPreFilterDirtyRect);
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if (aPreFilterVisualOverflowRectOverride) {
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mTargetBounds =
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FrameSpaceToFilterSpace(aPreFilterVisualOverflowRectOverride);
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} else {
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nsRect preFilterVOR = mTargetFrame->GetPreEffectsVisualOverflowRect();
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mTargetBounds = FrameSpaceToFilterSpace(&preFilterVOR);
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}
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mInitialized = true;
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}
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gfxRect
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nsFilterInstance::UserSpaceToFilterSpace(const gfxRect& aRect) const
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{
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gfxRect r = aRect - mFilterRegion.TopLeft();
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r.Scale(mFilterSpaceBounds.width / mFilterRegion.Width(),
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mFilterSpaceBounds.height / mFilterRegion.Height());
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return r;
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}
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gfxMatrix
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nsFilterInstance::GetUserSpaceToFilterSpaceTransform() const
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{
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gfxFloat widthScale = mFilterSpaceBounds.width / mFilterRegion.Width();
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gfxFloat heightScale = mFilterSpaceBounds.height / mFilterRegion.Height();
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return gfxMatrix(widthScale, 0.0f,
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0.0f, heightScale,
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-mFilterRegion.X() * widthScale, -mFilterRegion.Y() * heightScale);
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}
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nsresult
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nsFilterInstance::BuildPrimitives()
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{
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NS_ASSERTION(!mPrimitiveDescriptions.Length(),
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"expected to start building primitives from scratch");
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const nsTArray<nsStyleFilter>& filters = mTargetFrame->StyleSVGReset()->mFilters;
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for (uint32_t i = 0; i < filters.Length(); i++) {
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nsresult rv = BuildPrimitivesForFilter(filters[i]);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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return NS_OK;
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}
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nsresult
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nsFilterInstance::BuildPrimitivesForFilter(const nsStyleFilter& aFilter)
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{
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if (aFilter.GetType() == NS_STYLE_FILTER_URL) {
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// Build primitives for an SVG filter.
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nsSVGFilterInstance svgFilterInstance(aFilter, mTargetFrame, mTargetBBox);
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if (!svgFilterInstance.IsInitialized()) {
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return NS_ERROR_FAILURE;
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}
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// For now, we use the last SVG filter region as the overall filter region
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// for the filter chain. Eventually, we will compute the overall filter
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// using all of the generated FilterPrimitiveDescriptions.
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mFilterRegion = svgFilterInstance.GetFilterRegion();
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mFilterSpaceBounds = svgFilterInstance.GetFilterSpaceBounds();
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return svgFilterInstance.BuildPrimitives(mPrimitiveDescriptions, mInputImages);
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}
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// Eventually, we will build primitives for CSS filters, too.
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return NS_ERROR_FAILURE;
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}
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void
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nsFilterInstance::ComputeNeededBoxes()
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{
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if (mPrimitiveDescriptions.IsEmpty())
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return;
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nsIntRegion sourceGraphicNeededRegion;
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nsIntRegion fillPaintNeededRegion;
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nsIntRegion strokePaintNeededRegion;
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FilterDescription filter(mPrimitiveDescriptions, ToIntRect(mFilterSpaceBounds));
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FilterSupport::ComputeSourceNeededRegions(
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filter, mPostFilterDirtyRect,
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sourceGraphicNeededRegion, fillPaintNeededRegion, strokePaintNeededRegion);
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nsIntRect sourceBoundsInt;
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gfxRect sourceBounds = UserSpaceToFilterSpace(mTargetBBox);
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sourceBounds.RoundOut();
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// Detect possible float->int overflow
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if (!gfxUtils::GfxRectToIntRect(sourceBounds, &sourceBoundsInt))
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return;
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sourceBoundsInt.UnionRect(sourceBoundsInt, mTargetBounds);
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sourceGraphicNeededRegion.And(sourceGraphicNeededRegion, sourceBoundsInt);
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mSourceGraphic.mNeededBounds = sourceGraphicNeededRegion.GetBounds();
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mFillPaint.mNeededBounds = fillPaintNeededRegion.GetBounds();
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mStrokePaint.mNeededBounds = strokePaintNeededRegion.GetBounds();
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}
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nsresult
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nsFilterInstance::BuildSourcePaint(SourceInfo *aSource,
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gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT)
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{
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nsIntRect neededRect = aSource->mNeededBounds;
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RefPtr<DrawTarget> offscreenDT;
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nsRefPtr<gfxASurface> offscreenSurface;
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nsRefPtr<gfxContext> ctx;
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if (aTargetSurface) {
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offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
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neededRect.Size().ToIntSize(), gfxContentType::COLOR_ALPHA);
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if (!offscreenSurface || offscreenSurface->CairoStatus()) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenSurface);
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} else {
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offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
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ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
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if (!offscreenDT) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenDT);
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}
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ctx->Translate(-neededRect.TopLeft());
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nsRenderingContext tmpCtx;
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tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
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gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
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m.Invert();
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gfxRect r = m.TransformBounds(mFilterSpaceBounds);
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gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform().Invert();
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gfxContext *gfx = tmpCtx.ThebesContext();
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gfx->Multiply(deviceToFilterSpace);
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gfx->Save();
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gfxMatrix matrix =
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nsSVGUtils::GetCanvasTM(mTargetFrame, nsISVGChildFrame::FOR_PAINTING,
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mTransformRoot);
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if (!matrix.IsSingular()) {
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gfx->Multiply(matrix);
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gfx->Rectangle(r);
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if ((aSource == &mFillPaint &&
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nsSVGUtils::SetupCairoFillPaint(mTargetFrame, gfx)) ||
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(aSource == &mStrokePaint &&
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nsSVGUtils::SetupCairoStrokePaint(mTargetFrame, gfx))) {
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gfx->Fill();
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}
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}
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gfx->Restore();
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if (offscreenSurface) {
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aSource->mSourceSurface =
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gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
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} else {
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aSource->mSourceSurface = offscreenDT->Snapshot();
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}
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aSource->mSurfaceRect = ToIntRect(neededRect);
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return NS_OK;
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}
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nsresult
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nsFilterInstance::BuildSourcePaints(gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT)
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{
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nsresult rv = NS_OK;
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if (!mFillPaint.mNeededBounds.IsEmpty()) {
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rv = BuildSourcePaint(&mFillPaint, aTargetSurface, aTargetDT);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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if (!mStrokePaint.mNeededBounds.IsEmpty()) {
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rv = BuildSourcePaint(&mStrokePaint, aTargetSurface, aTargetDT);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return rv;
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}
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nsresult
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nsFilterInstance::BuildSourceImage(gfxASurface* aTargetSurface,
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DrawTarget* aTargetDT)
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{
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nsIntRect neededRect = mSourceGraphic.mNeededBounds;
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if (neededRect.IsEmpty()) {
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return NS_OK;
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}
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RefPtr<DrawTarget> offscreenDT;
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nsRefPtr<gfxASurface> offscreenSurface;
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nsRefPtr<gfxContext> ctx;
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if (aTargetSurface) {
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offscreenSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
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neededRect.Size().ToIntSize(), gfxContentType::COLOR_ALPHA);
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if (!offscreenSurface || offscreenSurface->CairoStatus()) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenSurface);
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} else {
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offscreenDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
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ToIntSize(neededRect.Size()), SurfaceFormat::B8G8R8A8);
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if (!offscreenDT) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ctx = new gfxContext(offscreenDT);
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}
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ctx->Translate(-neededRect.TopLeft());
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nsRenderingContext tmpCtx;
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tmpCtx.Init(mTargetFrame->PresContext()->DeviceContext(), ctx);
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gfxMatrix m = GetUserSpaceToFilterSpaceTransform();
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m.Invert();
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gfxRect r = m.TransformBounds(neededRect);
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r.RoundOut();
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nsIntRect dirty;
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if (!gfxUtils::GfxRectToIntRect(r, &dirty))
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return NS_ERROR_FAILURE;
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// SVG graphics paint to device space, so we need to set an initial device
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// space to filter space transform on the gfxContext that SourceGraphic
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// and SourceAlpha will paint to.
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//
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// (In theory it would be better to minimize error by having filtered SVG
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// graphics temporarily paint to user space when painting the sources and
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// only set a user space to filter space transform on the gfxContext
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// (since that would eliminate the transform multiplications from user
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// space to device space and back again). However, that would make the
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// code more complex while being hard to get right without introducing
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// subtle bugs, and in practice it probably makes no real difference.)
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gfxMatrix deviceToFilterSpace = GetFilterSpaceToDeviceSpaceTransform().Invert();
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tmpCtx.ThebesContext()->Multiply(deviceToFilterSpace);
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mPaintCallback->Paint(&tmpCtx, mTargetFrame, &dirty, mTransformRoot);
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RefPtr<SourceSurface> sourceGraphicSource;
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if (offscreenSurface) {
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sourceGraphicSource =
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gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTargetDT, offscreenSurface);
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} else {
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sourceGraphicSource = offscreenDT->Snapshot();
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}
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mSourceGraphic.mSourceSurface = sourceGraphicSource;
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mSourceGraphic.mSurfaceRect = ToIntRect(neededRect);
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return NS_OK;
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}
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nsresult
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nsFilterInstance::Render(gfxContext* aContext)
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{
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nsIntRect filterRect = mPostFilterDirtyRect.Intersect(mFilterSpaceBounds);
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gfxMatrix ctm = GetFilterSpaceToDeviceSpaceTransform();
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if (filterRect.IsEmpty() || ctm.IsSingular()) {
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return NS_OK;
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}
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Matrix oldDTMatrix;
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nsRefPtr<gfxASurface> resultImage;
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RefPtr<DrawTarget> dt;
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if (aContext->IsCairo()) {
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resultImage =
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gfxPlatform::GetPlatform()->CreateOffscreenSurface(filterRect.Size().ToIntSize(),
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gfxContentType::COLOR_ALPHA);
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if (!resultImage || resultImage->CairoStatus())
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return NS_ERROR_OUT_OF_MEMORY;
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// Create a Cairo DrawTarget around resultImage.
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dt = gfxPlatform::GetPlatform()->CreateDrawTargetForSurface(
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resultImage, ToIntSize(filterRect.Size()));
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} else {
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// When we have a DrawTarget-backed context, we can call DrawFilter
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// directly on the target DrawTarget and don't need a temporary DT.
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dt = aContext->GetDrawTarget();
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oldDTMatrix = dt->GetTransform();
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Matrix matrix = ToMatrix(ctm);
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matrix.Translate(filterRect.x, filterRect.y);
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dt->SetTransform(matrix * oldDTMatrix);
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}
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ComputeNeededBoxes();
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nsresult rv = BuildSourceImage(resultImage, dt);
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if (NS_FAILED(rv))
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return rv;
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rv = BuildSourcePaints(resultImage, dt);
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if (NS_FAILED(rv))
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return rv;
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IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
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FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
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FilterSupport::RenderFilterDescription(
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dt, filter, ToRect(filterRect),
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mSourceGraphic.mSourceSurface, mSourceGraphic.mSurfaceRect,
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mFillPaint.mSourceSurface, mFillPaint.mSurfaceRect,
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mStrokePaint.mSourceSurface, mStrokePaint.mSurfaceRect,
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mInputImages);
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if (resultImage) {
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aContext->Save();
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aContext->Multiply(ctm);
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aContext->Translate(filterRect.TopLeft());
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aContext->SetSource(resultImage);
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aContext->Paint();
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aContext->Restore();
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} else {
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dt->SetTransform(oldDTMatrix);
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}
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return NS_OK;
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}
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nsresult
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nsFilterInstance::ComputePostFilterDirtyRect(nsRect* aPostFilterDirtyRect)
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{
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*aPostFilterDirtyRect = nsRect();
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if (mPreFilterDirtyRect.IsEmpty()) {
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return NS_OK;
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}
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IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
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FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
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nsIntRegion resultChangeRegion =
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FilterSupport::ComputeResultChangeRegion(filter,
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mPreFilterDirtyRect, nsIntRegion(), nsIntRegion());
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*aPostFilterDirtyRect =
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FilterSpaceToFrameSpace(resultChangeRegion.GetBounds());
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return NS_OK;
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}
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nsresult
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nsFilterInstance::ComputePostFilterExtents(nsRect* aPostFilterExtents)
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{
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*aPostFilterExtents = nsRect();
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nsIntRect sourceBoundsInt;
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gfxRect sourceBounds = UserSpaceToFilterSpace(mTargetBBox);
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sourceBounds.RoundOut();
|
|
// Detect possible float->int overflow
|
|
if (!gfxUtils::GfxRectToIntRect(sourceBounds, &sourceBoundsInt))
|
|
return NS_ERROR_FAILURE;
|
|
sourceBoundsInt.UnionRect(sourceBoundsInt, mTargetBounds);
|
|
|
|
IntRect filterSpaceBounds = ToIntRect(mFilterSpaceBounds);
|
|
FilterDescription filter(mPrimitiveDescriptions, filterSpaceBounds);
|
|
nsIntRegion postFilterExtents =
|
|
FilterSupport::ComputePostFilterExtents(filter, sourceBoundsInt);
|
|
*aPostFilterExtents = FilterSpaceToFrameSpace(postFilterExtents.GetBounds());
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsFilterInstance::ComputeSourceNeededRect(nsRect* aDirty)
|
|
{
|
|
ComputeNeededBoxes();
|
|
*aDirty = FilterSpaceToFrameSpace(mSourceGraphic.mNeededBounds);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsIntRect
|
|
nsFilterInstance::FrameSpaceToFilterSpace(const nsRect* aRect) const
|
|
{
|
|
nsIntRect rect = mFilterSpaceBounds;
|
|
if (aRect) {
|
|
if (aRect->IsEmpty()) {
|
|
return nsIntRect();
|
|
}
|
|
gfxRect rectInCSSPx =
|
|
nsLayoutUtils::RectToGfxRect(*aRect, mAppUnitsPerCSSPx);
|
|
gfxRect rectInFilterSpace =
|
|
mFrameSpaceInCSSPxToFilterSpaceTransform.TransformBounds(rectInCSSPx);
|
|
rectInFilterSpace.RoundOut();
|
|
nsIntRect intRect;
|
|
if (gfxUtils::GfxRectToIntRect(rectInFilterSpace, &intRect)) {
|
|
rect = intRect;
|
|
}
|
|
}
|
|
return rect;
|
|
}
|
|
|
|
nsRect
|
|
nsFilterInstance::FilterSpaceToFrameSpace(const nsIntRect& aRect) const
|
|
{
|
|
if (aRect.IsEmpty()) {
|
|
return nsRect();
|
|
}
|
|
gfxRect r(aRect.x, aRect.y, aRect.width, aRect.height);
|
|
r = mFilterSpaceToFrameSpaceInCSSPxTransform.TransformBounds(r);
|
|
return nsLayoutUtils::RoundGfxRectToAppRect(r, mAppUnitsPerCSSPx);
|
|
}
|
|
|
|
gfxMatrix
|
|
nsFilterInstance::GetUserSpaceToFrameSpaceInCSSPxTransform() const
|
|
{
|
|
gfxMatrix userToFrameSpaceInCSSPx;
|
|
|
|
if ((mTargetFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
|
|
// As currently implemented by Mozilla for the purposes of filters, user
|
|
// space is the coordinate system established by GetCanvasTM(), since
|
|
// that's what we use to set filterToDeviceSpace above. In other words,
|
|
// for SVG, user space is actually the coordinate system aTarget
|
|
// establishes for _its_ children (i.e. after taking account of any x/y
|
|
// and viewBox attributes), not the coordinate system that is established
|
|
// for it by its 'transform' attribute (or by its _parent_) as it's
|
|
// normally defined. (XXX We should think about fixing this.) The only
|
|
// frame type for which these extra transforms are not simply an x/y
|
|
// translation is nsSVGInnerSVGFrame, hence we treat it specially here.
|
|
if (mTargetFrame->GetType() == nsGkAtoms::svgInnerSVGFrame) {
|
|
userToFrameSpaceInCSSPx =
|
|
static_cast<nsSVGElement*>(mTargetFrame->GetContent())->
|
|
PrependLocalTransformsTo(gfxMatrix());
|
|
} else {
|
|
gfxPoint targetsUserSpaceOffset =
|
|
nsLayoutUtils::RectToGfxRect(mTargetFrame->GetRect(),
|
|
mAppUnitsPerCSSPx).TopLeft();
|
|
userToFrameSpaceInCSSPx.Translate(-targetsUserSpaceOffset);
|
|
}
|
|
}
|
|
// else, for all other frames, leave as the identity matrix
|
|
return userToFrameSpaceInCSSPx;
|
|
}
|