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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ReadbackProcessor.h"
#include <sys/types.h> // for int32_t
#include "Layers.h" // for Layer, PaintedLayer, etc
#include "ReadbackLayer.h" // for ReadbackLayer, ReadbackSink
#include "UnitTransforms.h" // for ViewAs
#include "Units.h" // for ParentLayerIntRect
#include "gfxContext.h" // for gfxContext
#include "gfxUtils.h"
#include "gfxRect.h" // for gfxRect
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/BasePoint.h" // for BasePoint
#include "mozilla/gfx/BaseRect.h" // for BaseRect
#include "mozilla/gfx/Point.h" // for Intsize
#include "nsDebug.h" // for NS_ASSERTION
#include "nsISupportsImpl.h" // for gfxContext::Release, etc
#include "nsPoint.h" // for nsIntPoint
#include "nsRegion.h" // for nsIntRegion
using namespace mozilla::gfx;
namespace mozilla {
namespace layers {
void ReadbackProcessor::BuildUpdates(ContainerLayer* aContainer) {
NS_ASSERTION(mAllUpdates.IsEmpty(), "Some updates not processed?");
if (!aContainer->mMayHaveReadbackChild) return;
aContainer->mMayHaveReadbackChild = false;
// go backwards so the updates read from earlier layers are later in the
// array.
for (Layer* l = aContainer->GetLastChild(); l; l = l->GetPrevSibling()) {
if (l->GetType() == Layer::TYPE_READBACK) {
aContainer->mMayHaveReadbackChild = true;
BuildUpdatesForLayer(static_cast<ReadbackLayer*>(l));
}
}
}
static Layer* FindBackgroundLayer(ReadbackLayer* aLayer, nsIntPoint* aOffset) {
gfx::Matrix transform;
if (!aLayer->GetTransform().Is2D(&transform) ||
transform.HasNonIntegerTranslation())
return nullptr;
nsIntPoint transformOffset(int32_t(transform._31), int32_t(transform._32));
for (Layer* l = aLayer->GetPrevSibling(); l; l = l->GetPrevSibling()) {
gfx::Matrix backgroundTransform;
if (!l->GetTransform().Is2D(&backgroundTransform) ||
gfx::ThebesMatrix(backgroundTransform).HasNonIntegerTranslation())
return nullptr;
nsIntPoint backgroundOffset(int32_t(backgroundTransform._31),
int32_t(backgroundTransform._32));
IntRect rectInBackground(transformOffset - backgroundOffset,
aLayer->GetSize());
const nsIntRegion visibleRegion =
l->GetLocalVisibleRegion().ToUnknownRegion();
if (!visibleRegion.Intersects(rectInBackground)) continue;
// Since l is present in the background, from here on we either choose l
// or nothing.
if (!visibleRegion.Contains(rectInBackground)) return nullptr;
if (l->GetEffectiveOpacity() != 1.0 || l->HasMaskLayers() ||
!(l->GetContentFlags() & Layer::CONTENT_OPAQUE)) {
return nullptr;
}
// cliprects are post-transform
const Maybe<ParentLayerIntRect>& clipRect = l->GetLocalClipRect();
if (clipRect && !clipRect->Contains(ViewAs<ParentLayerPixel>(
IntRect(transformOffset, aLayer->GetSize()))))
return nullptr;
Layer::LayerType type = l->GetType();
if (type != Layer::TYPE_COLOR && type != Layer::TYPE_PAINTED)
return nullptr;
*aOffset = backgroundOffset - transformOffset;
return l;
}
return nullptr;
}
void ReadbackProcessor::BuildUpdatesForLayer(ReadbackLayer* aLayer) {
if (!aLayer->mSink) return;
nsIntPoint offset;
Layer* newBackground = FindBackgroundLayer(aLayer, &offset);
if (!newBackground) {
aLayer->SetUnknown();
return;
}
if (newBackground->GetType() == Layer::TYPE_COLOR) {
ColorLayer* colorLayer = static_cast<ColorLayer*>(newBackground);
if (aLayer->mBackgroundColor != colorLayer->GetColor()) {
aLayer->mBackgroundLayer = nullptr;
aLayer->mBackgroundColor = colorLayer->GetColor();
NS_ASSERTION(aLayer->mBackgroundColor.a == 1.f,
"Color layer said it was opaque!");
RefPtr<DrawTarget> dt = aLayer->mSink->BeginUpdate(
aLayer->GetRect(), aLayer->AllocateSequenceNumber());
if (dt) {
ColorPattern color(aLayer->mBackgroundColor);
IntSize size = aLayer->GetSize();
dt->FillRect(Rect(0, 0, size.width, size.height), color);
aLayer->mSink->EndUpdate(aLayer->GetRect());
}
}
} else {
NS_ASSERTION(newBackground->AsPaintedLayer(), "Must be PaintedLayer");
PaintedLayer* paintedLayer = static_cast<PaintedLayer*>(newBackground);
// updateRect is relative to the PaintedLayer
IntRect updateRect = aLayer->GetRect() - offset;
if (paintedLayer != aLayer->mBackgroundLayer ||
offset != aLayer->mBackgroundLayerOffset) {
aLayer->mBackgroundLayer = paintedLayer;
aLayer->mBackgroundLayerOffset = offset;
aLayer->mBackgroundColor = DeviceColor();
paintedLayer->SetUsedForReadback(true);
} else {
nsIntRegion invalid;
invalid.Sub(updateRect, paintedLayer->GetValidRegion());
updateRect = invalid.GetBounds();
}
Update update = {aLayer, updateRect, aLayer->AllocateSequenceNumber()};
mAllUpdates.AppendElement(update);
}
}
void ReadbackProcessor::GetPaintedLayerUpdates(PaintedLayer* aLayer,
nsTArray<Update>* aUpdates,
nsIntRegion* aUpdateRegion) {
// All PaintedLayers used for readback are in mAllUpdates (some possibly
// with an empty update rect).
aLayer->SetUsedForReadback(false);
if (aUpdateRegion) {
aUpdateRegion->SetEmpty();
}
for (uint32_t i = mAllUpdates.Length(); i > 0; --i) {
const Update& update = mAllUpdates[i - 1];
if (update.mLayer->mBackgroundLayer == aLayer) {
aLayer->SetUsedForReadback(true);
// Don't bother asking for updates if we have an empty update rect.
if (!update.mUpdateRect.IsEmpty()) {
aUpdates->AppendElement(update);
if (aUpdateRegion) {
aUpdateRegion->Or(*aUpdateRegion, update.mUpdateRect);
}
}
mAllUpdates.RemoveElementAt(i - 1);
}
}
}
ReadbackProcessor::~ReadbackProcessor() {
for (uint32_t i = mAllUpdates.Length(); i > 0; --i) {
const Update& update = mAllUpdates[i - 1];
// Unprocessed update. Notify the readback sink that this content is
// unknown.
update.mLayer->SetUnknown();
}
}
} // namespace layers
} // namespace mozilla
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