gecko-dev/gfx/layers/basic/BasicThebesLayer.cpp

263 lines
9.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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 "BasicThebesLayer.h"
#include <stdint.h> // for uint32_t
#include "GeckoProfiler.h" // for PROFILER_LABEL
#include "ReadbackLayer.h" // for ReadbackLayer, ReadbackSink
#include "ReadbackProcessor.h" // for ReadbackProcessor::Update, etc
#include "RenderTrace.h" // for RenderTraceInvalidateEnd, etc
#include "BasicLayersImpl.h" // for AutoMaskData, etc
#include "gfxASurface.h" // for gfxASurface, etc
#include "gfxContext.h" // for gfxContext, etc
#include "gfxRect.h" // for gfxRect
#include "gfxUtils.h" // for gfxUtils
#include "mozilla/gfx/2D.h" // for DrawTarget
#include "mozilla/gfx/BaseRect.h" // for BaseRect
#include "mozilla/gfx/Matrix.h" // for Matrix
#include "mozilla/gfx/Rect.h" // for Rect, IntRect
#include "mozilla/gfx/Types.h" // for Float, etc
#include "mozilla/layers/LayersTypes.h"
#include "nsAutoPtr.h" // for nsRefPtr
#include "nsCOMPtr.h" // for already_AddRefed
#include "nsISupportsImpl.h" // for gfxContext::Release, etc
#include "nsPoint.h" // for nsIntPoint
#include "nsRect.h" // for nsIntRect
#include "nsTArray.h" // for nsTArray, nsTArray_Impl
#include "AutoMaskData.h"
struct gfxMatrix;
using namespace mozilla::gfx;
namespace mozilla {
namespace layers {
static nsIntRegion
IntersectWithClip(const nsIntRegion& aRegion, gfxContext* aContext)
{
gfxRect clip = aContext->GetClipExtents();
clip.RoundOut();
nsIntRect r(clip.X(), clip.Y(), clip.Width(), clip.Height());
nsIntRegion result;
result.And(aRegion, r);
return result;
}
static void
SetAntialiasingFlags(Layer* aLayer, gfxContext* aTarget)
{
if (!aTarget->IsCairo()) {
RefPtr<DrawTarget> dt = aTarget->GetDrawTarget();
if (dt->GetFormat() != FORMAT_B8G8R8A8) {
return;
}
const nsIntRect& bounds = aLayer->GetVisibleRegion().GetBounds();
gfx::Rect transformedBounds = dt->GetTransform().TransformBounds(gfx::Rect(Float(bounds.x), Float(bounds.y),
Float(bounds.width), Float(bounds.height)));
transformedBounds.RoundOut();
IntRect intTransformedBounds;
transformedBounds.ToIntRect(&intTransformedBounds);
dt->SetPermitSubpixelAA(!(aLayer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA) ||
dt->GetOpaqueRect().Contains(intTransformedBounds));
} else {
nsRefPtr<gfxASurface> surface = aTarget->CurrentSurface();
if (surface->GetContentType() != GFX_CONTENT_COLOR_ALPHA) {
// Destination doesn't have alpha channel; no need to set any special flags
return;
}
const nsIntRect& bounds = aLayer->GetVisibleRegion().GetBounds();
surface->SetSubpixelAntialiasingEnabled(
!(aLayer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA) ||
surface->GetOpaqueRect().Contains(
aTarget->UserToDevice(gfxRect(bounds.x, bounds.y, bounds.width, bounds.height))));
}
}
void
BasicThebesLayer::PaintThebes(gfxContext* aContext,
Layer* aMaskLayer,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData,
ReadbackProcessor* aReadback)
{
PROFILER_LABEL("BasicThebesLayer", "PaintThebes");
NS_ASSERTION(BasicManager()->InDrawing(),
"Can only draw in drawing phase");
nsTArray<ReadbackProcessor::Update> readbackUpdates;
if (aReadback && UsedForReadback()) {
aReadback->GetThebesLayerUpdates(this, &readbackUpdates);
}
float opacity = GetEffectiveOpacity();
gfxContext::GraphicsOperator mixBlendMode = GetEffectiveMixBlendMode();
if (!BasicManager()->IsRetained()) {
NS_ASSERTION(readbackUpdates.IsEmpty(), "Can't do readback for non-retained layer");
mValidRegion.SetEmpty();
mContentClient->Clear();
nsIntRegion toDraw = IntersectWithClip(GetEffectiveVisibleRegion(), aContext);
RenderTraceInvalidateStart(this, "FFFF00", toDraw.GetBounds());
if (!toDraw.IsEmpty() && !IsHidden()) {
if (!aCallback) {
BasicManager()->SetTransactionIncomplete();
return;
}
aContext->Save();
bool needsClipToVisibleRegion = GetClipToVisibleRegion();
bool needsGroup =
opacity != 1.0 || GetOperator() != gfxContext::OPERATOR_OVER || mixBlendMode != gfxContext::OPERATOR_OVER || aMaskLayer;
nsRefPtr<gfxContext> groupContext;
if (needsGroup) {
groupContext =
BasicManager()->PushGroupForLayer(aContext, this, toDraw,
&needsClipToVisibleRegion);
if (GetOperator() != gfxContext::OPERATOR_OVER || mixBlendMode != gfxContext::OPERATOR_OVER) {
needsClipToVisibleRegion = true;
}
} else {
groupContext = aContext;
}
SetAntialiasingFlags(this, groupContext);
aCallback(this, groupContext, toDraw, nsIntRegion(), aCallbackData);
if (needsGroup) {
BasicManager()->PopGroupToSourceWithCachedSurface(aContext, groupContext);
if (needsClipToVisibleRegion) {
gfxUtils::ClipToRegion(aContext, toDraw);
}
AutoSetOperator setOptimizedOperator(aContext, mixBlendMode != gfxContext::OPERATOR_OVER ? mixBlendMode : GetOperator());
PaintWithMask(aContext, opacity, aMaskLayer);
}
aContext->Restore();
}
RenderTraceInvalidateEnd(this, "FFFF00");
return;
}
if (BasicManager()->IsTransactionIncomplete())
return;
gfxRect clipExtents;
clipExtents = aContext->GetClipExtents();
// Pull out the mask surface and transform here, because the mask
// is internal to basic layers
AutoMaskData mask;
gfxASurface* maskSurface = nullptr;
const gfxMatrix* maskTransform = nullptr;
if (GetMaskData(aMaskLayer, &mask)) {
maskSurface = mask.GetSurface();
maskTransform = &mask.GetTransform();
}
if (!IsHidden() && !clipExtents.IsEmpty()) {
AutoSetOperator setOperator(aContext, GetOperator());
mContentClient->DrawTo(this, aContext, opacity, maskSurface, maskTransform);
}
for (uint32_t i = 0; i < readbackUpdates.Length(); ++i) {
ReadbackProcessor::Update& update = readbackUpdates[i];
nsIntPoint offset = update.mLayer->GetBackgroundLayerOffset();
nsRefPtr<gfxContext> ctx =
update.mLayer->GetSink()->BeginUpdate(update.mUpdateRect + offset,
update.mSequenceCounter);
if (ctx) {
NS_ASSERTION(opacity == 1.0, "Should only read back opaque layers");
ctx->Translate(gfxPoint(offset.x, offset.y));
mContentClient->DrawTo(this, ctx, 1.0, maskSurface, maskTransform);
update.mLayer->GetSink()->EndUpdate(ctx, update.mUpdateRect + offset);
}
}
}
void
BasicThebesLayer::Validate(LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData)
{
if (!mContentClient) {
// we pass a null pointer for the Forwarder argument, which means
// this will not have a ContentHost on the other side.
mContentClient = new ContentClientBasic(nullptr, BasicManager());
}
if (!BasicManager()->IsRetained()) {
return;
}
bool canUseOpaqueSurface = CanUseOpaqueSurface();
ContentType contentType =
canUseOpaqueSurface ? GFX_CONTENT_COLOR :
GFX_CONTENT_COLOR_ALPHA;
uint32_t flags = 0;
#ifndef MOZ_WIDGET_ANDROID
if (BasicManager()->CompositorMightResample()) {
flags |= ThebesLayerBuffer::PAINT_WILL_RESAMPLE;
}
if (!(flags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE)) {
if (MayResample()) {
flags |= ThebesLayerBuffer::PAINT_WILL_RESAMPLE;
}
}
#endif
if (mDrawAtomically) {
flags |= ThebesLayerBuffer::PAINT_NO_ROTATION;
}
PaintState state =
mContentClient->BeginPaintBuffer(this, contentType, flags);
mValidRegion.Sub(mValidRegion, state.mRegionToInvalidate);
if (state.mContext) {
// The area that became invalid and is visible needs to be repainted
// (this could be the whole visible area if our buffer switched
// from RGB to RGBA, because we might need to repaint with
// subpixel AA)
state.mRegionToInvalidate.And(state.mRegionToInvalidate,
GetEffectiveVisibleRegion());
nsIntRegion extendedDrawRegion = state.mRegionToDraw;
SetAntialiasingFlags(this, state.mContext);
RenderTraceInvalidateStart(this, "FFFF00", state.mRegionToDraw.GetBounds());
PaintBuffer(state.mContext,
state.mRegionToDraw, extendedDrawRegion, state.mRegionToInvalidate,
state.mDidSelfCopy,
aCallback, aCallbackData);
MOZ_LAYERS_LOG_IF_SHADOWABLE(this, ("Layer::Mutated(%p) PaintThebes", this));
Mutated();
RenderTraceInvalidateEnd(this, "FFFF00");
} else {
// It's possible that state.mRegionToInvalidate is nonempty here,
// if we are shrinking the valid region to nothing. So use mRegionToDraw
// instead.
NS_WARN_IF_FALSE(state.mRegionToDraw.IsEmpty(),
"No context when we have something to draw, resource exhaustion?");
}
}
already_AddRefed<ThebesLayer>
BasicLayerManager::CreateThebesLayer()
{
NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
nsRefPtr<ThebesLayer> layer = new BasicThebesLayer(this);
return layer.forget();
}
}
}