forked from mirrors/gecko-dev
476 lines
14 KiB
C++
476 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 20; 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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#include "DisplayItemClip.h"
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#include "gfxContext.h"
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#include "gfxUtils.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/PathHelpers.h"
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#include "nsPresContext.h"
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#include "nsCSSRendering.h"
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#include "nsLayoutUtils.h"
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#include "nsRegion.h"
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using namespace mozilla::gfx;
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namespace mozilla {
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void
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DisplayItemClip::SetTo(const nsRect& aRect)
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{
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SetTo(aRect, nullptr);
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}
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void
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DisplayItemClip::SetTo(const nsRect& aRect, const nscoord* aRadii)
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{
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mHaveClipRect = true;
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mClipRect = aRect;
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if (aRadii) {
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mRoundedClipRects.SetLength(1);
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mRoundedClipRects[0].mRect = aRect;
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memcpy(mRoundedClipRects[0].mRadii, aRadii, sizeof(nscoord)*8);
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} else {
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mRoundedClipRects.Clear();
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}
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}
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void
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DisplayItemClip::SetTo(const nsRect& aRect,
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const nsRect& aRoundedRect,
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const nscoord* aRadii)
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{
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mHaveClipRect = true;
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mClipRect = aRect;
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mRoundedClipRects.SetLength(1);
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mRoundedClipRects[0].mRect = aRoundedRect;
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memcpy(mRoundedClipRects[0].mRadii, aRadii, sizeof(nscoord)*8);
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}
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bool
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DisplayItemClip::MayIntersect(const nsRect& aRect) const
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{
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if (!mHaveClipRect) {
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return !aRect.IsEmpty();
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}
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nsRect r = aRect.Intersect(mClipRect);
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if (r.IsEmpty()) {
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return false;
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}
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for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
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const RoundedRect& rr = mRoundedClipRects[i];
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if (!nsLayoutUtils::RoundedRectIntersectsRect(rr.mRect, rr.mRadii, r)) {
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return false;
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}
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}
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return true;
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}
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void
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DisplayItemClip::IntersectWith(const DisplayItemClip& aOther)
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{
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if (!aOther.mHaveClipRect) {
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return;
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}
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if (!mHaveClipRect) {
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*this = aOther;
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return;
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}
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if (!mClipRect.IntersectRect(mClipRect, aOther.mClipRect)) {
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mRoundedClipRects.Clear();
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return;
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}
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mRoundedClipRects.AppendElements(aOther.mRoundedClipRects);
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}
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void
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DisplayItemClip::ApplyTo(gfxContext* aContext,
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nsPresContext* aPresContext,
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uint32_t aBegin, uint32_t aEnd)
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{
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int32_t A2D = aPresContext->AppUnitsPerDevPixel();
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ApplyRectTo(aContext, A2D);
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ApplyRoundedRectClipsTo(aContext, A2D, aBegin, aEnd);
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}
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void
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DisplayItemClip::ApplyRectTo(gfxContext* aContext, int32_t A2D) const
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{
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aContext->NewPath();
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gfxRect clip = nsLayoutUtils::RectToGfxRect(mClipRect, A2D);
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aContext->Rectangle(clip, true);
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aContext->Clip();
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}
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void
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DisplayItemClip::ApplyRoundedRectClipsTo(gfxContext* aContext,
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int32_t A2D,
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uint32_t aBegin, uint32_t aEnd) const
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{
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DrawTarget& aDrawTarget = *aContext->GetDrawTarget();
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aEnd = std::min<uint32_t>(aEnd, mRoundedClipRects.Length());
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for (uint32_t i = aBegin; i < aEnd; ++i) {
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RefPtr<Path> roundedRect =
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MakeRoundedRectPath(aDrawTarget, A2D, mRoundedClipRects[i]);
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aContext->Clip(roundedRect);
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}
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}
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void
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DisplayItemClip::FillIntersectionOfRoundedRectClips(gfxContext* aContext,
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const Color& aColor,
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int32_t aAppUnitsPerDevPixel,
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uint32_t aBegin,
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uint32_t aEnd) const
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{
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DrawTarget& aDrawTarget = *aContext->GetDrawTarget();
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aEnd = std::min<uint32_t>(aEnd, mRoundedClipRects.Length());
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if (aBegin >= aEnd) {
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return;
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}
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// Push clips for any rects that come BEFORE the rect at |aEnd - 1|, if any:
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ApplyRoundedRectClipsTo(aContext, aAppUnitsPerDevPixel, aBegin, aEnd - 1);
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// Now fill the rect at |aEnd - 1|:
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RefPtr<Path> roundedRect = MakeRoundedRectPath(aDrawTarget,
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aAppUnitsPerDevPixel,
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mRoundedClipRects[aEnd - 1]);
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ColorPattern color(ToDeviceColor(aColor));
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aDrawTarget.Fill(roundedRect, color);
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// Finally, pop any clips that we may have pushed:
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for (uint32_t i = aBegin; i < aEnd - 1; ++i) {
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aContext->PopClip();
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}
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}
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already_AddRefed<Path>
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DisplayItemClip::MakeRoundedRectPath(DrawTarget& aDrawTarget,
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int32_t A2D,
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const RoundedRect &aRoundRect) const
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{
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RectCornerRadii pixelRadii;
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nsCSSRendering::ComputePixelRadii(aRoundRect.mRadii, A2D, &pixelRadii);
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Rect rect = NSRectToSnappedRect(aRoundRect.mRect, A2D, aDrawTarget);
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return MakePathForRoundedRect(aDrawTarget, rect, pixelRadii);
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}
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nsRect
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DisplayItemClip::ApproximateIntersectInward(const nsRect& aRect) const
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{
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nsRect r = aRect;
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if (mHaveClipRect) {
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r.IntersectRect(r, mClipRect);
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}
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length();
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i < iEnd; ++i) {
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const RoundedRect &rr = mRoundedClipRects[i];
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nsRegion rgn = nsLayoutUtils::RoundedRectIntersectRect(rr.mRect, rr.mRadii, r);
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r = rgn.GetLargestRectangle();
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}
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return r;
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}
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// Test if (aXPoint, aYPoint) is in the ellipse with center (aXCenter, aYCenter)
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// and radii aXRadius, aYRadius.
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bool IsInsideEllipse(nscoord aXRadius, nscoord aXCenter, nscoord aXPoint,
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nscoord aYRadius, nscoord aYCenter, nscoord aYPoint)
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{
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float scaledX = float(aXPoint - aXCenter) / float(aXRadius);
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float scaledY = float(aYPoint - aYCenter) / float(aYRadius);
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return scaledX * scaledX + scaledY * scaledY < 1.0f;
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}
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bool
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DisplayItemClip::IsRectClippedByRoundedCorner(const nsRect& aRect) const
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{
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if (mRoundedClipRects.IsEmpty())
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return false;
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nsRect rect;
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rect.IntersectRect(aRect, NonRoundedIntersection());
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length();
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i < iEnd; ++i) {
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const RoundedRect &rr = mRoundedClipRects[i];
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// top left
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if (rect.x < rr.mRect.x + rr.mRadii[NS_CORNER_TOP_LEFT_X] &&
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rect.y < rr.mRect.y + rr.mRadii[NS_CORNER_TOP_LEFT_Y]) {
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if (!IsInsideEllipse(rr.mRadii[NS_CORNER_TOP_LEFT_X],
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rr.mRect.x + rr.mRadii[NS_CORNER_TOP_LEFT_X],
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rect.x,
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rr.mRadii[NS_CORNER_TOP_LEFT_Y],
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rr.mRect.y + rr.mRadii[NS_CORNER_TOP_LEFT_Y],
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rect.y)) {
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return true;
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}
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}
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// top right
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if (rect.XMost() > rr.mRect.XMost() - rr.mRadii[NS_CORNER_TOP_RIGHT_X] &&
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rect.y < rr.mRect.y + rr.mRadii[NS_CORNER_TOP_RIGHT_Y]) {
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if (!IsInsideEllipse(rr.mRadii[NS_CORNER_TOP_RIGHT_X],
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rr.mRect.XMost() - rr.mRadii[NS_CORNER_TOP_RIGHT_X],
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rect.XMost(),
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rr.mRadii[NS_CORNER_TOP_RIGHT_Y],
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rr.mRect.y + rr.mRadii[NS_CORNER_TOP_RIGHT_Y],
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rect.y)) {
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return true;
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}
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}
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// bottom left
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if (rect.x < rr.mRect.x + rr.mRadii[NS_CORNER_BOTTOM_LEFT_X] &&
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rect.YMost() > rr.mRect.YMost() - rr.mRadii[NS_CORNER_BOTTOM_LEFT_Y]) {
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if (!IsInsideEllipse(rr.mRadii[NS_CORNER_BOTTOM_LEFT_X],
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rr.mRect.x + rr.mRadii[NS_CORNER_BOTTOM_LEFT_X],
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rect.x,
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rr.mRadii[NS_CORNER_BOTTOM_LEFT_Y],
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rr.mRect.YMost() - rr.mRadii[NS_CORNER_BOTTOM_LEFT_Y],
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rect.YMost())) {
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return true;
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}
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}
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// bottom right
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if (rect.XMost() > rr.mRect.XMost() - rr.mRadii[NS_CORNER_BOTTOM_RIGHT_X] &&
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rect.YMost() > rr.mRect.YMost() - rr.mRadii[NS_CORNER_BOTTOM_RIGHT_Y]) {
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if (!IsInsideEllipse(rr.mRadii[NS_CORNER_BOTTOM_RIGHT_X],
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rr.mRect.XMost() - rr.mRadii[NS_CORNER_BOTTOM_RIGHT_X],
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rect.XMost(),
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rr.mRadii[NS_CORNER_BOTTOM_RIGHT_Y],
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rr.mRect.YMost() - rr.mRadii[NS_CORNER_BOTTOM_RIGHT_Y],
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rect.YMost())) {
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return true;
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}
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}
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}
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return false;
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}
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nsRect
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DisplayItemClip::NonRoundedIntersection() const
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{
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NS_ASSERTION(mHaveClipRect, "Must have a clip rect!");
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nsRect result = mClipRect;
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length();
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i < iEnd; ++i) {
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result.IntersectRect(result, mRoundedClipRects[i].mRect);
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}
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return result;
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}
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bool
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DisplayItemClip::IsRectAffectedByClip(const nsRect& aRect) const
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{
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if (mHaveClipRect && !mClipRect.Contains(aRect)) {
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return true;
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}
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length();
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i < iEnd; ++i) {
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const RoundedRect &rr = mRoundedClipRects[i];
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nsRegion rgn = nsLayoutUtils::RoundedRectIntersectRect(rr.mRect, rr.mRadii, aRect);
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if (!rgn.Contains(aRect)) {
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return true;
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}
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}
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return false;
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}
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bool
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DisplayItemClip::IsRectAffectedByClip(const nsIntRect& aRect,
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float aXScale,
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float aYScale,
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int32_t A2D) const
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{
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if (mHaveClipRect) {
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nsIntRect pixelClipRect = mClipRect.ScaleToNearestPixels(aXScale, aYScale, A2D);
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if (!pixelClipRect.Contains(aRect)) {
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return true;
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}
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}
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// Rounded rect clipping only snaps to user-space pixels, not device space.
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nsIntRect unscaled = aRect;
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unscaled.Scale(1/aXScale, 1/aYScale);
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length();
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i < iEnd; ++i) {
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const RoundedRect &rr = mRoundedClipRects[i];
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nsIntRect pixelRect = rr.mRect.ToNearestPixels(A2D);
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RectCornerRadii pixelRadii;
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nsCSSRendering::ComputePixelRadii(rr.mRadii, A2D, &pixelRadii);
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nsIntRegion rgn = nsLayoutUtils::RoundedRectIntersectIntRect(pixelRect, pixelRadii, unscaled);
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if (!rgn.Contains(unscaled)) {
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return true;
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}
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}
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return false;
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}
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nsRect
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DisplayItemClip::ApplyNonRoundedIntersection(const nsRect& aRect) const
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{
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if (!mHaveClipRect) {
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return aRect;
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}
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nsRect result = aRect.Intersect(mClipRect);
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length();
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i < iEnd; ++i) {
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result = result.Intersect(mRoundedClipRects[i].mRect);
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}
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return result;
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}
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void
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DisplayItemClip::RemoveRoundedCorners()
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{
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if (mRoundedClipRects.IsEmpty())
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return;
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mClipRect = NonRoundedIntersection();
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mRoundedClipRects.Clear();
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}
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// Computes the difference between aR1 and aR2, limited to aBounds.
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static void
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AccumulateRectDifference(const nsRect& aR1, const nsRect& aR2, const nsRect& aBounds, nsRegion* aOut)
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{
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if (aR1.IsEqualInterior(aR2))
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return;
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nsRegion r;
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r.Xor(aR1, aR2);
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r.And(r, aBounds);
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aOut->Or(*aOut, r);
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}
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void
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DisplayItemClip::AddOffsetAndComputeDifference(uint32_t aStart,
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const nsPoint& aOffset,
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const nsRect& aBounds,
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const DisplayItemClip& aOther,
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uint32_t aOtherStart,
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const nsRect& aOtherBounds,
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nsRegion* aDifference)
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{
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if (mHaveClipRect != aOther.mHaveClipRect ||
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aStart != aOtherStart ||
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mRoundedClipRects.Length() != aOther.mRoundedClipRects.Length()) {
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aDifference->Or(*aDifference, aBounds);
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aDifference->Or(*aDifference, aOtherBounds);
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return;
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}
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if (mHaveClipRect) {
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AccumulateRectDifference(mClipRect + aOffset, aOther.mClipRect,
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aBounds.Union(aOtherBounds),
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aDifference);
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}
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for (uint32_t i = aStart; i < mRoundedClipRects.Length(); ++i) {
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if (mRoundedClipRects[i] + aOffset != aOther.mRoundedClipRects[i]) {
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// The corners make it tricky so we'll just add both rects here.
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aDifference->Or(*aDifference, mRoundedClipRects[i].mRect.Intersect(aBounds));
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aDifference->Or(*aDifference, aOther.mRoundedClipRects[i].mRect.Intersect(aOtherBounds));
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}
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}
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}
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uint32_t
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DisplayItemClip::GetCommonRoundedRectCount(const DisplayItemClip& aOther,
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uint32_t aMax) const
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{
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uint32_t end = std::min(std::min(mRoundedClipRects.Length(), size_t(aMax)),
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aOther.mRoundedClipRects.Length());
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uint32_t clipCount = 0;
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for (; clipCount < end; ++clipCount) {
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if (mRoundedClipRects[clipCount] !=
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aOther.mRoundedClipRects[clipCount]) {
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return clipCount;
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}
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}
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return clipCount;
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}
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void
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DisplayItemClip::AppendRoundedRects(nsTArray<RoundedRect>* aArray, uint32_t aCount) const
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{
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size_t count = std::min(mRoundedClipRects.Length(), size_t(aCount));
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aArray->AppendElements(mRoundedClipRects.Elements(), count);
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}
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bool
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DisplayItemClip::ComputeRegionInClips(DisplayItemClip* aOldClip,
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const nsPoint& aShift,
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nsRegion* aCombined) const
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{
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if (!mHaveClipRect || (aOldClip && !aOldClip->mHaveClipRect)) {
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return false;
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}
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if (aOldClip) {
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*aCombined = aOldClip->NonRoundedIntersection();
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aCombined->MoveBy(aShift);
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aCombined->Or(*aCombined, NonRoundedIntersection());
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} else {
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*aCombined = NonRoundedIntersection();
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}
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return true;
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}
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void
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DisplayItemClip::MoveBy(nsPoint aPoint)
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{
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if (!mHaveClipRect)
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return;
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mClipRect += aPoint;
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for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
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mRoundedClipRects[i].mRect += aPoint;
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}
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}
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static DisplayItemClip* gNoClip;
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const DisplayItemClip&
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DisplayItemClip::NoClip()
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{
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if (!gNoClip) {
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gNoClip = new DisplayItemClip();
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}
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return *gNoClip;
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}
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void
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DisplayItemClip::Shutdown()
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{
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delete gNoClip;
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gNoClip = nullptr;
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}
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nsCString
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DisplayItemClip::ToString() const
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{
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nsAutoCString str;
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if (mHaveClipRect) {
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str.AppendPrintf("%d,%d,%d,%d", mClipRect.x, mClipRect.y,
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mClipRect.width, mClipRect.height);
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for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
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const RoundedRect& r = mRoundedClipRects[i];
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str.AppendPrintf(" [%d,%d,%d,%d corners %d,%d,%d,%d,%d,%d,%d,%d]",
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r.mRect.x, r.mRect.y, r.mRect.width, r.mRect.height,
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r.mRadii[0], r.mRadii[1], r.mRadii[2], r.mRadii[3],
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r.mRadii[4], r.mRadii[5], r.mRadii[6], r.mRadii[7]);
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}
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}
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return str;
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}
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} // namespace mozilla
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