mirror of
https://github.com/mozilla/gecko-dev.git
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615 lines
23 KiB
C++
615 lines
23 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 "mozilla/layers/TiledContentClient.h"
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#include <math.h> // for ceil, ceilf, floor
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#include "ClientTiledThebesLayer.h" // for ClientTiledThebesLayer
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#include "GeckoProfiler.h" // for PROFILER_LABEL
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#include "ClientLayerManager.h" // for ClientLayerManager
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#include "gfxContext.h" // for gfxContext, etc
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#include "gfxPlatform.h" // for gfxPlatform
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#include "gfxRect.h" // for gfxRect
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#include "mozilla/MathAlgorithms.h" // for Abs
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#include "mozilla/gfx/Point.h" // for IntSize
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#include "mozilla/gfx/Rect.h" // for Rect
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#include "mozilla/layers/CompositableForwarder.h"
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#include "mozilla/layers/ShadowLayers.h" // for ShadowLayerForwarder
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#include "nsDebug.h" // for NS_ASSERTION
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#include "nsISupportsImpl.h" // for gfxContext::AddRef, etc
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#include "nsSize.h" // for nsIntSize
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#include "gfxReusableSharedImageSurfaceWrapper.h"
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#include "nsMathUtils.h" // for NS_roundf
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#include "gfx2DGlue.h"
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#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
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#include "cairo.h"
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#include <sstream>
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using mozilla::layers::Layer;
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static void DrawDebugOverlay(gfxASurface* imgSurf, int x, int y)
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{
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gfxContext c(imgSurf);
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// Draw border
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c.NewPath();
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c.SetDeviceColor(gfxRGBA(0.0, 0.0, 0.0, 1.0));
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c.Rectangle(gfxRect(gfxPoint(0,0),imgSurf->GetSize()));
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c.Stroke();
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// Build tile description
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std::stringstream ss;
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ss << x << ", " << y;
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// Draw text using cairo toy text API
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cairo_t* cr = c.GetCairo();
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cairo_set_font_size(cr, 25);
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cairo_text_extents_t extents;
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cairo_text_extents(cr, ss.str().c_str(), &extents);
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int textWidth = extents.width + 6;
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c.NewPath();
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c.SetDeviceColor(gfxRGBA(0.0, 0.0, 0.0, 1.0));
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c.Rectangle(gfxRect(gfxPoint(2,2),gfxSize(textWidth, 30)));
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c.Fill();
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c.NewPath();
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c.SetDeviceColor(gfxRGBA(1.0, 0.0, 0.0, 1.0));
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c.Rectangle(gfxRect(gfxPoint(2,2),gfxSize(textWidth, 30)));
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c.Stroke();
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c.NewPath();
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cairo_move_to(cr, 4, 28);
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cairo_show_text(cr, ss.str().c_str());
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}
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#endif
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namespace mozilla {
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using namespace gfx;
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namespace layers {
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TiledContentClient::TiledContentClient(ClientTiledThebesLayer* aThebesLayer,
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ClientLayerManager* aManager)
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: CompositableClient(aManager->AsShadowForwarder())
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, mTiledBuffer(aThebesLayer, aManager)
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, mLowPrecisionTiledBuffer(aThebesLayer, aManager)
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{
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MOZ_COUNT_CTOR(TiledContentClient);
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mLowPrecisionTiledBuffer.SetResolution(gfxPlatform::GetLowPrecisionResolution());
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}
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void
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TiledContentClient::LockCopyAndWrite(TiledBufferType aType)
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{
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BasicTiledLayerBuffer* buffer = aType == LOW_PRECISION_TILED_BUFFER
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? &mLowPrecisionTiledBuffer
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: &mTiledBuffer;
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// Take an extra ReadLock on behalf of the TiledContentHost. This extra
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// reference will be adopted when the descriptor is opened by
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// BasicTiledLayerTile::OpenDescriptor.
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buffer->ReadLock();
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mForwarder->PaintedTiledLayerBuffer(this, buffer->GetSurfaceDescriptorTiles());
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buffer->ClearPaintedRegion();
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}
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BasicTiledLayerBuffer::BasicTiledLayerBuffer(ClientTiledThebesLayer* aThebesLayer,
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ClientLayerManager* aManager)
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: mThebesLayer(aThebesLayer)
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, mManager(aManager)
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, mLastPaintOpaque(false)
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{
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}
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bool
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BasicTiledLayerBuffer::HasFormatChanged() const
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{
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return mThebesLayer->CanUseOpaqueSurface() != mLastPaintOpaque;
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}
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gfxContentType
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BasicTiledLayerBuffer::GetContentType() const
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{
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if (mThebesLayer->CanUseOpaqueSurface()) {
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return GFX_CONTENT_COLOR;
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} else {
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return GFX_CONTENT_COLOR_ALPHA;
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}
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}
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TileDescriptor
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BasicTiledLayerTile::GetTileDescriptor()
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{
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gfxReusableSurfaceWrapper* surface = GetSurface();
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switch (surface->GetType()) {
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case gfxReusableSurfaceWrapper::TYPE_IMAGE :
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return BasicTileDescriptor(uintptr_t(surface));
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case gfxReusableSurfaceWrapper::TYPE_SHARED_IMAGE :
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return BasicShmTileDescriptor(static_cast<gfxReusableSharedImageSurfaceWrapper*>(surface)->GetShmem());
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default :
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NS_NOTREACHED("Unhandled gfxReusableSurfaceWrapper type");
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return PlaceholderTileDescriptor();
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}
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}
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/* static */ BasicTiledLayerTile
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BasicTiledLayerTile::OpenDescriptor(ISurfaceAllocator *aAllocator, const TileDescriptor& aDesc)
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{
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switch (aDesc.type()) {
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case TileDescriptor::TBasicShmTileDescriptor : {
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nsRefPtr<gfxReusableSurfaceWrapper> surface =
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gfxReusableSharedImageSurfaceWrapper::Open(
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aAllocator, aDesc.get_BasicShmTileDescriptor().reusableSurface());
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return BasicTiledLayerTile(
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new DeprecatedTextureClientTile(nullptr, TextureInfo(BUFFER_TILED), surface));
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}
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case TileDescriptor::TBasicTileDescriptor : {
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nsRefPtr<gfxReusableSurfaceWrapper> surface =
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reinterpret_cast<gfxReusableSurfaceWrapper*>(
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aDesc.get_BasicTileDescriptor().reusableSurface());
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surface->ReadUnlock();
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return BasicTiledLayerTile(
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new DeprecatedTextureClientTile(nullptr, TextureInfo(BUFFER_TILED), surface));
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}
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default :
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NS_NOTREACHED("Unknown tile descriptor type!");
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return nullptr;
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}
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}
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SurfaceDescriptorTiles
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BasicTiledLayerBuffer::GetSurfaceDescriptorTiles()
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{
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InfallibleTArray<TileDescriptor> tiles;
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for (size_t i = 0; i < mRetainedTiles.Length(); i++) {
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TileDescriptor tileDesc;
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if (mRetainedTiles.SafeElementAt(i, GetPlaceholderTile()) == GetPlaceholderTile()) {
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tileDesc = PlaceholderTileDescriptor();
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} else {
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tileDesc = mRetainedTiles[i].GetTileDescriptor();
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}
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tiles.AppendElement(tileDesc);
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}
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return SurfaceDescriptorTiles(mValidRegion, mPaintedRegion,
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tiles, mRetainedWidth, mRetainedHeight,
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mResolution);
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}
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/* static */ BasicTiledLayerBuffer
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BasicTiledLayerBuffer::OpenDescriptor(ISurfaceAllocator *aAllocator,
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const SurfaceDescriptorTiles& aDescriptor)
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{
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return BasicTiledLayerBuffer(aAllocator,
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aDescriptor.validRegion(),
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aDescriptor.paintedRegion(),
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aDescriptor.tiles(),
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aDescriptor.retainedWidth(),
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aDescriptor.retainedHeight(),
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aDescriptor.resolution());
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}
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void
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BasicTiledLayerBuffer::PaintThebes(const nsIntRegion& aNewValidRegion,
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const nsIntRegion& aPaintRegion,
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LayerManager::DrawThebesLayerCallback aCallback,
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void* aCallbackData)
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{
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mCallback = aCallback;
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mCallbackData = aCallbackData;
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#ifdef GFX_TILEDLAYER_PREF_WARNINGS
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long start = PR_IntervalNow();
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#endif
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// If this region is empty XMost() - 1 will give us a negative value.
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NS_ASSERTION(!aPaintRegion.GetBounds().IsEmpty(), "Empty paint region\n");
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bool useSinglePaintBuffer = UseSinglePaintBuffer();
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// XXX The single-tile case doesn't work at the moment, see bug 850396
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/*
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if (useSinglePaintBuffer) {
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// Check if the paint only spans a single tile. If that's
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// the case there's no point in using a single paint buffer.
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nsIntRect paintBounds = aPaintRegion.GetBounds();
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useSinglePaintBuffer = GetTileStart(paintBounds.x) !=
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GetTileStart(paintBounds.XMost() - 1) ||
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GetTileStart(paintBounds.y) !=
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GetTileStart(paintBounds.YMost() - 1);
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}
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*/
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if (useSinglePaintBuffer) {
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nsRefPtr<gfxContext> ctxt;
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const nsIntRect bounds = aPaintRegion.GetBounds();
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{
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PROFILER_LABEL("BasicTiledLayerBuffer", "PaintThebesSingleBufferAlloc");
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gfxImageFormat format =
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gfxPlatform::GetPlatform()->OptimalFormatForContent(
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GetContentType());
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if (gfxPlatform::GetPlatform()->SupportsAzureContent()) {
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mSinglePaintDrawTarget =
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gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
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gfx::IntSize(ceilf(bounds.width * mResolution),
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ceilf(bounds.height * mResolution)),
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gfx::ImageFormatToSurfaceFormat(format));
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ctxt = new gfxContext(mSinglePaintDrawTarget);
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} else {
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mSinglePaintBuffer = new gfxImageSurface(
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gfxIntSize(ceilf(bounds.width * mResolution),
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ceilf(bounds.height * mResolution)),
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format,
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!mThebesLayer->CanUseOpaqueSurface());
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ctxt = new gfxContext(mSinglePaintBuffer);
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}
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mSinglePaintBufferOffset = nsIntPoint(bounds.x, bounds.y);
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}
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ctxt->NewPath();
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ctxt->Scale(mResolution, mResolution);
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ctxt->Translate(gfxPoint(-bounds.x, -bounds.y));
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#ifdef GFX_TILEDLAYER_PREF_WARNINGS
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if (PR_IntervalNow() - start > 3) {
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printf_stderr("Slow alloc %i\n", PR_IntervalNow() - start);
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}
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start = PR_IntervalNow();
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#endif
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PROFILER_LABEL("BasicTiledLayerBuffer", "PaintThebesSingleBufferDraw");
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mCallback(mThebesLayer, ctxt, aPaintRegion, nsIntRegion(), mCallbackData);
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}
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#ifdef GFX_TILEDLAYER_PREF_WARNINGS
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if (PR_IntervalNow() - start > 30) {
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const nsIntRect bounds = aPaintRegion.GetBounds();
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printf_stderr("Time to draw %i: %i, %i, %i, %i\n", PR_IntervalNow() - start, bounds.x, bounds.y, bounds.width, bounds.height);
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if (aPaintRegion.IsComplex()) {
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printf_stderr("Complex region\n");
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nsIntRegionRectIterator it(aPaintRegion);
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for (const nsIntRect* rect = it.Next(); rect != nullptr; rect = it.Next()) {
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printf_stderr(" rect %i, %i, %i, %i\n", rect->x, rect->y, rect->width, rect->height);
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}
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}
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}
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start = PR_IntervalNow();
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#endif
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PROFILER_LABEL("BasicTiledLayerBuffer", "PaintThebesUpdate");
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Update(aNewValidRegion, aPaintRegion);
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#ifdef GFX_TILEDLAYER_PREF_WARNINGS
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if (PR_IntervalNow() - start > 10) {
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const nsIntRect bounds = aPaintRegion.GetBounds();
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printf_stderr("Time to tile %i: %i, %i, %i, %i\n", PR_IntervalNow() - start, bounds.x, bounds.y, bounds.width, bounds.height);
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}
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#endif
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mLastPaintOpaque = mThebesLayer->CanUseOpaqueSurface();
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mCallback = nullptr;
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mCallbackData = nullptr;
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mSinglePaintBuffer = nullptr;
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mSinglePaintDrawTarget = nullptr;
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}
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BasicTiledLayerTile
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BasicTiledLayerBuffer::ValidateTileInternal(BasicTiledLayerTile aTile,
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const nsIntPoint& aTileOrigin,
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const nsIntRect& aDirtyRect)
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{
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if (aTile.IsPlaceholderTile()) {
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RefPtr<DeprecatedTextureClient> textureClient =
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new DeprecatedTextureClientTile(mManager, TextureInfo(BUFFER_TILED));
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aTile.mDeprecatedTextureClient = static_cast<DeprecatedTextureClientTile*>(textureClient.get());
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}
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aTile.mDeprecatedTextureClient->EnsureAllocated(gfx::IntSize(GetTileLength(), GetTileLength()), GetContentType());
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gfxImageSurface* writableSurface = aTile.mDeprecatedTextureClient->LockImageSurface();
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// Bug 742100, this gfxContext really should live on the stack.
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nsRefPtr<gfxContext> ctxt;
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RefPtr<gfx::DrawTarget> writableDrawTarget;
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if (gfxPlatform::GetPlatform()->SupportsAzureContent()) {
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// TODO: Instead of creating a gfxImageSurface to back the tile we should
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// create an offscreen DrawTarget. This would need to be shared cross-thread
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// and support copy on write semantics.
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gfx::SurfaceFormat format =
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gfx::ImageFormatToSurfaceFormat(writableSurface->Format());
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writableDrawTarget =
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gfxPlatform::GetPlatform()->CreateDrawTargetForData(
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writableSurface->Data(),
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gfx::IntSize(writableSurface->Width(), writableSurface->Height()),
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writableSurface->Stride(),
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format);
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ctxt = new gfxContext(writableDrawTarget);
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} else {
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ctxt = new gfxContext(writableSurface);
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ctxt->SetOperator(gfxContext::OPERATOR_SOURCE);
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}
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gfxRect drawRect(aDirtyRect.x - aTileOrigin.x, aDirtyRect.y - aTileOrigin.y,
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aDirtyRect.width, aDirtyRect.height);
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if (mSinglePaintBuffer || mSinglePaintDrawTarget) {
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if (gfxPlatform::GetPlatform()->SupportsAzureContent()) {
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gfx::Rect drawRect(aDirtyRect.x - aTileOrigin.x,
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aDirtyRect.y - aTileOrigin.y,
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aDirtyRect.width,
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aDirtyRect.height);
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drawRect.Scale(mResolution);
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RefPtr<gfx::SourceSurface> source = mSinglePaintDrawTarget->Snapshot();
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writableDrawTarget->CopySurface(
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source,
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gfx::IntRect(NS_roundf((aDirtyRect.x - mSinglePaintBufferOffset.x) * mResolution),
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NS_roundf((aDirtyRect.y - mSinglePaintBufferOffset.y) * mResolution),
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drawRect.width,
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drawRect.height),
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gfx::IntPoint(NS_roundf(drawRect.x), NS_roundf(drawRect.y)));
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} else {
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gfxRect drawRect(aDirtyRect.x - aTileOrigin.x, aDirtyRect.y - aTileOrigin.y,
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aDirtyRect.width, aDirtyRect.height);
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drawRect.Scale(mResolution, mResolution);
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ctxt->NewPath();
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ctxt->SetSource(mSinglePaintBuffer.get(),
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gfxPoint((mSinglePaintBufferOffset.x - aDirtyRect.x) * mResolution + drawRect.x,
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(mSinglePaintBufferOffset.y - aDirtyRect.y) * mResolution + drawRect.y));
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ctxt->SnappedRectangle(drawRect);
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ctxt->Fill();
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}
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} else {
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ctxt->NewPath();
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ctxt->Scale(mResolution, mResolution);
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ctxt->Translate(gfxPoint(-aTileOrigin.x, -aTileOrigin.y));
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nsIntPoint a = nsIntPoint(aTileOrigin.x, aTileOrigin.y);
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mCallback(mThebesLayer, ctxt,
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nsIntRegion(nsIntRect(a, nsIntSize(GetScaledTileLength(),
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GetScaledTileLength()))),
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nsIntRegion(), mCallbackData);
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}
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#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
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DrawDebugOverlay(writableSurface, aTileOrigin.x * mResolution,
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aTileOrigin.y * mResolution);
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#endif
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return aTile;
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}
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BasicTiledLayerTile
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BasicTiledLayerBuffer::ValidateTile(BasicTiledLayerTile aTile,
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const nsIntPoint& aTileOrigin,
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const nsIntRegion& aDirtyRegion)
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{
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PROFILER_LABEL("BasicTiledLayerBuffer", "ValidateTile");
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#ifdef GFX_TILEDLAYER_PREF_WARNINGS
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if (aDirtyRegion.IsComplex()) {
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printf_stderr("Complex region\n");
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}
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#endif
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nsIntRegionRectIterator it(aDirtyRegion);
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for (const nsIntRect* rect = it.Next(); rect != nullptr; rect = it.Next()) {
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#ifdef GFX_TILEDLAYER_PREF_WARNINGS
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printf_stderr(" break into subrect %i, %i, %i, %i\n", rect->x, rect->y, rect->width, rect->height);
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#endif
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aTile = ValidateTileInternal(aTile, aTileOrigin, *rect);
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}
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return aTile;
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}
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static nsIntRect
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RoundedTransformViewportBounds(const gfx::Rect& aViewport,
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const CSSPoint& aScrollOffset,
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const gfxSize& aResolution,
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float aScaleX,
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float aScaleY,
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const gfx3DMatrix& aTransform)
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{
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gfxRect transformedViewport(aViewport.x - (aScrollOffset.x * aResolution.width),
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aViewport.y - (aScrollOffset.y * aResolution.height),
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aViewport.width, aViewport.height);
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transformedViewport.Scale((aScaleX / aResolution.width) / aResolution.width,
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(aScaleY / aResolution.height) / aResolution.height);
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transformedViewport = aTransform.TransformBounds(transformedViewport);
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return nsIntRect((int32_t)floor(transformedViewport.x),
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(int32_t)floor(transformedViewport.y),
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(int32_t)ceil(transformedViewport.width),
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(int32_t)ceil(transformedViewport.height));
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}
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bool
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BasicTiledLayerBuffer::ComputeProgressiveUpdateRegion(const nsIntRegion& aInvalidRegion,
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const nsIntRegion& aOldValidRegion,
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nsIntRegion& aRegionToPaint,
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BasicTiledLayerPaintData* aPaintData,
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bool aIsRepeated)
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{
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aRegionToPaint = aInvalidRegion;
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// If this is a low precision buffer, we force progressive updates. The
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// assumption is that the contents is less important, so visual coherency
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// is lower priority than speed.
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bool drawingLowPrecision = IsLowPrecision();
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// Find out if we have any non-stale content to update.
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nsIntRegion staleRegion;
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staleRegion.And(aInvalidRegion, aOldValidRegion);
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// Find out the current view transform to determine which tiles to draw
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// first, and see if we should just abort this paint. Aborting is usually
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// caused by there being an incoming, more relevant paint.
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gfx::Rect viewport;
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float scaleX, scaleY;
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if (mManager->ProgressiveUpdateCallback(!staleRegion.Contains(aInvalidRegion),
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viewport,
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scaleX, scaleY, !drawingLowPrecision)) {
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PROFILER_LABEL("ContentClient", "Abort painting");
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aRegionToPaint.SetEmpty();
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return aIsRepeated;
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}
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// Transform the screen coordinates into local layer coordinates.
|
|
nsIntRect roundedTransformedViewport =
|
|
RoundedTransformViewportBounds(viewport, aPaintData->mScrollOffset, aPaintData->mResolution,
|
|
scaleX, scaleY, aPaintData->mTransformScreenToLayer);
|
|
|
|
// Paint tiles that have stale content or that intersected with the screen
|
|
// at the time of issuing the draw command in a single transaction first.
|
|
// This is to avoid rendering glitches on animated page content, and when
|
|
// layers change size/shape.
|
|
nsIntRect criticalViewportRect = roundedTransformedViewport.Intersect(aPaintData->mCompositionBounds);
|
|
aRegionToPaint.And(aInvalidRegion, criticalViewportRect);
|
|
aRegionToPaint.Or(aRegionToPaint, staleRegion);
|
|
bool drawingStale = !aRegionToPaint.IsEmpty();
|
|
if (!drawingStale) {
|
|
aRegionToPaint = aInvalidRegion;
|
|
}
|
|
|
|
// Prioritise tiles that are currently visible on the screen.
|
|
bool paintVisible = false;
|
|
if (aRegionToPaint.Intersects(roundedTransformedViewport)) {
|
|
aRegionToPaint.And(aRegionToPaint, roundedTransformedViewport);
|
|
paintVisible = true;
|
|
}
|
|
|
|
// Paint area that's visible and overlaps previously valid content to avoid
|
|
// visible glitches in animated elements, such as gifs.
|
|
bool paintInSingleTransaction = paintVisible && (drawingStale || aPaintData->mFirstPaint);
|
|
|
|
// The following code decides what order to draw tiles in, based on the
|
|
// current scroll direction of the primary scrollable layer.
|
|
NS_ASSERTION(!aRegionToPaint.IsEmpty(), "Unexpectedly empty paint region!");
|
|
nsIntRect paintBounds = aRegionToPaint.GetBounds();
|
|
|
|
int startX, incX, startY, incY;
|
|
int tileLength = GetScaledTileLength();
|
|
if (aPaintData->mScrollOffset.x >= aPaintData->mLastScrollOffset.x) {
|
|
startX = RoundDownToTileEdge(paintBounds.x);
|
|
incX = tileLength;
|
|
} else {
|
|
startX = RoundDownToTileEdge(paintBounds.XMost() - 1);
|
|
incX = -tileLength;
|
|
}
|
|
|
|
if (aPaintData->mScrollOffset.y >= aPaintData->mLastScrollOffset.y) {
|
|
startY = RoundDownToTileEdge(paintBounds.y);
|
|
incY = tileLength;
|
|
} else {
|
|
startY = RoundDownToTileEdge(paintBounds.YMost() - 1);
|
|
incY = -tileLength;
|
|
}
|
|
|
|
// Find a tile to draw.
|
|
nsIntRect tileBounds(startX, startY, tileLength, tileLength);
|
|
int32_t scrollDiffX = aPaintData->mScrollOffset.x - aPaintData->mLastScrollOffset.x;
|
|
int32_t scrollDiffY = aPaintData->mScrollOffset.y - aPaintData->mLastScrollOffset.y;
|
|
// This loop will always terminate, as there is at least one tile area
|
|
// along the first/last row/column intersecting with regionToPaint, or its
|
|
// bounds would have been smaller.
|
|
while (true) {
|
|
aRegionToPaint.And(aInvalidRegion, tileBounds);
|
|
if (!aRegionToPaint.IsEmpty()) {
|
|
break;
|
|
}
|
|
if (Abs(scrollDiffY) >= Abs(scrollDiffX)) {
|
|
tileBounds.x += incX;
|
|
} else {
|
|
tileBounds.y += incY;
|
|
}
|
|
}
|
|
|
|
if (!aRegionToPaint.Contains(aInvalidRegion)) {
|
|
// The region needed to paint is larger then our progressive chunk size
|
|
// therefore update what we want to paint and ask for a new paint transaction.
|
|
|
|
// If we need to draw more than one tile to maintain coherency, make
|
|
// sure it happens in the same transaction by requesting this work be
|
|
// repeated immediately.
|
|
// If this is unnecessary, the remaining work will be done tile-by-tile in
|
|
// subsequent transactions.
|
|
if (!drawingLowPrecision && paintInSingleTransaction) {
|
|
return true;
|
|
}
|
|
|
|
mManager->SetRepeatTransaction();
|
|
return false;
|
|
}
|
|
|
|
// We're not repeating painting and we've not requested a repeat transaction,
|
|
// so the paint is finished. If there's still a separate low precision
|
|
// paint to do, it will get marked as unfinished later.
|
|
aPaintData->mPaintFinished = true;
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
BasicTiledLayerBuffer::ProgressiveUpdate(nsIntRegion& aValidRegion,
|
|
nsIntRegion& aInvalidRegion,
|
|
const nsIntRegion& aOldValidRegion,
|
|
BasicTiledLayerPaintData* aPaintData,
|
|
LayerManager::DrawThebesLayerCallback aCallback,
|
|
void* aCallbackData)
|
|
{
|
|
bool repeat = false;
|
|
bool isBufferChanged = false;
|
|
do {
|
|
// Compute the region that should be updated. Repeat as many times as
|
|
// is required.
|
|
nsIntRegion regionToPaint;
|
|
repeat = ComputeProgressiveUpdateRegion(aInvalidRegion,
|
|
aOldValidRegion,
|
|
regionToPaint,
|
|
aPaintData,
|
|
repeat);
|
|
|
|
// There's no further work to be done.
|
|
if (regionToPaint.IsEmpty()) {
|
|
break;
|
|
}
|
|
|
|
isBufferChanged = true;
|
|
|
|
// Keep track of what we're about to refresh.
|
|
aValidRegion.Or(aValidRegion, regionToPaint);
|
|
|
|
// aValidRegion may have been altered by InvalidateRegion, but we still
|
|
// want to display stale content until it gets progressively updated.
|
|
// Create a region that includes stale content.
|
|
nsIntRegion validOrStale;
|
|
validOrStale.Or(aValidRegion, aOldValidRegion);
|
|
|
|
// Paint the computed region and subtract it from the invalid region.
|
|
PaintThebes(validOrStale, regionToPaint, aCallback, aCallbackData);
|
|
aInvalidRegion.Sub(aInvalidRegion, regionToPaint);
|
|
} while (repeat);
|
|
|
|
// Return false if nothing has been drawn, or give what has been drawn
|
|
// to the shadow layer to upload.
|
|
return isBufferChanged;
|
|
}
|
|
|
|
}
|
|
}
|