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0fd9123eac
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87 lines
3.0 KiB
C++
87 lines
3.0 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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#include "BasicThebesLayer.h"
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#include "BasicBuffers.h"
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#include "gfxUtils.h"
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using namespace mozilla::gfx;
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namespace mozilla {
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namespace layers {
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static bool
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IsClippingCheap(gfxContext* aTarget, const nsIntRegion& aRegion)
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{
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// Assume clipping is cheap if the context just has an integer
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// translation, and the visible region is simple.
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return !aTarget->CurrentMatrix().HasNonIntegerTranslation() &&
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aRegion.GetNumRects() <= 1;
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}
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void
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BasicThebesLayerBuffer::DrawTo(ThebesLayer* aLayer,
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gfxContext* aTarget,
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float aOpacity,
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Layer* aMaskLayer)
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{
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aTarget->Save();
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// If the entire buffer is valid, we can just draw the whole thing,
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// no need to clip. But we'll still clip if clipping is cheap ---
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// that might let us copy a smaller region of the buffer.
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// Also clip to the visible region if we're told to.
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if (!aLayer->GetValidRegion().Contains(BufferRect()) ||
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(ToData(aLayer)->GetClipToVisibleRegion() &&
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!aLayer->GetVisibleRegion().Contains(BufferRect())) ||
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IsClippingCheap(aTarget, aLayer->GetEffectiveVisibleRegion())) {
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// We don't want to draw invalid stuff, so we need to clip. Might as
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// well clip to the smallest area possible --- the visible region.
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// Bug 599189 if there is a non-integer-translation transform in aTarget,
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// we might sample pixels outside GetEffectiveVisibleRegion(), which is wrong
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// and may cause gray lines.
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gfxUtils::ClipToRegionSnapped(aTarget, aLayer->GetEffectiveVisibleRegion());
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}
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// Pull out the mask surface and transform here, because the mask
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// is internal to basic layers
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AutoMaskData mask;
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if (GetMaskData(aMaskLayer, &mask)) {
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DrawBufferWithRotation(aTarget, aOpacity,
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mask.GetSurface(), &mask.GetTransform());
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} else {
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DrawBufferWithRotation(aTarget, aOpacity);
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}
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aTarget->Restore();
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}
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already_AddRefed<gfxASurface>
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BasicThebesLayerBuffer::CreateBuffer(ContentType aType,
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const nsIntSize& aSize, uint32_t aFlags)
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{
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return mLayer->CreateBuffer(aType, aSize);
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}
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void
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BasicThebesLayerBuffer::SetBackingBufferAndUpdateFrom(
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gfxASurface* aBuffer,
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gfxASurface* aSource, const nsIntRect& aRect, const nsIntPoint& aRotation,
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const nsIntRegion& aUpdateRegion)
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{
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SetBackingBuffer(aBuffer, aRect, aRotation);
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nsRefPtr<gfxContext> destCtx =
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GetContextForQuadrantUpdate(aUpdateRegion.GetBounds());
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destCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
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if (IsClippingCheap(destCtx, aUpdateRegion)) {
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gfxUtils::ClipToRegion(destCtx, aUpdateRegion);
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}
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BasicThebesLayerBuffer srcBuffer(aSource, aRect, aRotation);
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srcBuffer.DrawBufferWithRotation(destCtx, 1.0);
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}
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}
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}
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