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gecko-dev/widget/gonk/HwcComposer2D.cpp

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/*
* Copyright (c) 2012, 2013 The Linux Foundation. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android/log.h>
#include <string.h>
#include "libdisplay/GonkDisplay.h"
#include "Framebuffer.h"
#include "GLContext.h" // for GLContext
#include "HwcUtils.h"
#include "HwcComposer2D.h"
#include "mozilla/layers/LayerManagerComposite.h"
#include "mozilla/layers/PLayerTransaction.h"
#include "mozilla/layers/ShadowLayerUtilsGralloc.h"
#include "mozilla/layers/TextureHostOGL.h" // for TextureHostOGL
#include "mozilla/StaticPtr.h"
#include "cutils/properties.h"
#include "gfx2DGlue.h"
#if ANDROID_VERSION >= 17
#include "libdisplay/FramebufferSurface.h"
#ifndef HWC_BLIT
#define HWC_BLIT (HWC_FRAMEBUFFER_TARGET + 1)
#endif
#endif
#ifdef LOG_TAG
#undef LOG_TAG
#endif
#define LOG_TAG "HWComposer"
/*
* By default the debug message of hwcomposer (LOG_DEBUG level) are undefined,
* but can be enabled by uncommenting HWC_DEBUG below.
*/
//#define HWC_DEBUG
#ifdef HWC_DEBUG
#define LOGD(args...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, ## args)
#else
#define LOGD(args...) ((void)0)
#endif
#define LOGI(args...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, ## args)
#define LOGE(args...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, ## args)
#define LAYER_COUNT_INCREMENTS 5
using namespace android;
using namespace mozilla::layers;
namespace mozilla {
static StaticRefPtr<HwcComposer2D> sInstance;
HwcComposer2D::HwcComposer2D()
: mHwc(nullptr)
, mList(nullptr)
, mMaxLayerCount(0)
, mColorFill(false)
, mRBSwapSupport(false)
#if ANDROID_VERSION >= 17
, mPrevRetireFence(Fence::NO_FENCE)
, mPrevDisplayFence(Fence::NO_FENCE)
#endif
, mPrepared(false)
{
}
HwcComposer2D::~HwcComposer2D() {
free(mList);
}
int
HwcComposer2D::Init(hwc_display_t dpy, hwc_surface_t sur)
{
MOZ_ASSERT(!Initialized());
mHwc = (HwcDevice*)GetGonkDisplay()->GetHWCDevice();
if (!mHwc) {
LOGE("Failed to initialize hwc");
return -1;
}
nsIntSize screenSize;
mozilla::Framebuffer::GetSize(&screenSize);
mScreenRect = nsIntRect(nsIntPoint(0, 0), screenSize);
#if ANDROID_VERSION >= 17
int supported = 0;
if (mHwc->query) {
if (mHwc->query(mHwc, HwcUtils::HWC_COLOR_FILL, &supported) == NO_ERROR) {
mColorFill = !!supported;
}
if (mHwc->query(mHwc, HwcUtils::HWC_FORMAT_RB_SWAP, &supported) == NO_ERROR) {
mRBSwapSupport = !!supported;
}
} else {
mColorFill = false;
mRBSwapSupport = false;
}
#else
char propValue[PROPERTY_VALUE_MAX];
property_get("ro.display.colorfill", propValue, "0");
mColorFill = (atoi(propValue) == 1) ? true : false;
mRBSwapSupport = true;
#endif
mDpy = dpy;
mSur = sur;
return 0;
}
HwcComposer2D*
HwcComposer2D::GetInstance()
{
if (!sInstance) {
LOGI("Creating new instance");
sInstance = new HwcComposer2D();
}
return sInstance;
}
bool
HwcComposer2D::ReallocLayerList()
{
int size = sizeof(HwcList) +
((mMaxLayerCount + LAYER_COUNT_INCREMENTS) * sizeof(HwcLayer));
HwcList* listrealloc = (HwcList*)realloc(mList, size);
if (!listrealloc) {
return false;
}
if (!mList) {
//first alloc, initialize
listrealloc->numHwLayers = 0;
listrealloc->flags = 0;
}
mList = listrealloc;
mMaxLayerCount += LAYER_COUNT_INCREMENTS;
return true;
}
void
HwcComposer2D::setCrop(HwcLayer* layer, hwc_rect_t srcCrop)
{
#if ANDROID_VERSION >= 19
if (mHwc->common.version >= HWC_DEVICE_API_VERSION_1_3) {
layer->sourceCropf.left = srcCrop.left;
layer->sourceCropf.top = srcCrop.top;
layer->sourceCropf.right = srcCrop.right;
layer->sourceCropf.bottom = srcCrop.bottom;
} else {
layer->sourceCrop = srcCrop;
}
#else
layer->sourceCrop = srcCrop;
#endif
}
void
HwcComposer2D::setHwcGeometry(bool aGeometryChanged)
{
#if ANDROID_VERSION >= 19
mList->flags = aGeometryChanged ? HWC_GEOMETRY_CHANGED : 0;
#else
mList->flags = HWC_GEOMETRY_CHANGED;
#endif
}
bool
HwcComposer2D::PrepareLayerList(Layer* aLayer,
const nsIntRect& aClip,
const gfxMatrix& aParentTransform,
const gfxMatrix& aGLWorldTransform)
{
// NB: we fall off this path whenever there are container layers
// that require intermediate surfaces. That means all the
// GetEffective*() coordinates are relative to the framebuffer.
bool fillColor = false;
const nsIntRegion& visibleRegion = aLayer->GetEffectiveVisibleRegion();
if (visibleRegion.IsEmpty()) {
return true;
}
uint8_t opacity = std::min(0xFF, (int)(aLayer->GetEffectiveOpacity() * 256.0));
#if ANDROID_VERSION < 18
if (opacity < 0xFF) {
LOGD("%s Layer has planar semitransparency which is unsupported", aLayer->Name());
return false;
}
#endif
nsIntRect clip;
if (!HwcUtils::CalculateClipRect(aParentTransform * aGLWorldTransform,
aLayer->GetEffectiveClipRect(),
aClip,
&clip))
{
LOGD("%s Clip rect is empty. Skip layer", aLayer->Name());
return true;
}
// HWC supports only the following 2D transformations:
//
// Scaling via the sourceCrop and displayFrame in HwcLayer
// Translation via the sourceCrop and displayFrame in HwcLayer
// Rotation (in square angles only) via the HWC_TRANSFORM_ROT_* flags
// Reflection (horizontal and vertical) via the HWC_TRANSFORM_FLIP_* flags
//
// A 2D transform with PreservesAxisAlignedRectangles() has all the attributes
// above
gfxMatrix transform;
gfx3DMatrix transform3D;
gfx::To3DMatrix(aLayer->GetEffectiveTransform(), transform3D);
if (!transform3D.Is2D(&transform) || !transform.PreservesAxisAlignedRectangles()) {
LOGD("Layer has a 3D transform or a non-square angle rotation");
return false;
}
if (ContainerLayer* container = aLayer->AsContainerLayer()) {
if (container->UseIntermediateSurface()) {
LOGD("Container layer needs intermediate surface");
return false;
}
nsAutoTArray<Layer*, 12> children;
container->SortChildrenBy3DZOrder(children);
for (uint32_t i = 0; i < children.Length(); i++) {
if (!PrepareLayerList(children[i], clip, transform, aGLWorldTransform)) {
return false;
}
}
return true;
}
LayerRenderState state = aLayer->GetRenderState();
nsIntSize surfaceSize;
if (state.mSurface.get()) {
surfaceSize = state.mSize;
} else {
if (aLayer->AsColorLayer() && mColorFill) {
fillColor = true;
} else {
LOGD("%s Layer doesn't have a gralloc buffer", aLayer->Name());
return false;
}
}
// Buffer rotation is not to be confused with the angled rotation done by a transform matrix
// It's a fancy ThebesLayer feature used for scrolling
if (state.BufferRotated()) {
LOGD("%s Layer has a rotated buffer", aLayer->Name());
return false;
}
nsIntRect visibleRect = visibleRegion.GetBounds();
nsIntRect bufferRect;
if (fillColor) {
bufferRect = nsIntRect(visibleRect);
} else {
if(state.mHasOwnOffset) {
bufferRect = nsIntRect(state.mOffset.x, state.mOffset.y,
state.mSize.width, state.mSize.height);
} else {
//Since the buffer doesn't have its own offset, assign the whole
//surface size as its buffer bounds
bufferRect = nsIntRect(0, 0, state.mSize.width, state.mSize.height);
}
}
hwc_rect_t sourceCrop, displayFrame;
if(!HwcUtils::PrepareLayerRects(visibleRect,
transform * aGLWorldTransform,
clip,
bufferRect,
state.YFlipped(),
&(sourceCrop),
&(displayFrame)))
{
return true;
}
// OK! We can compose this layer with hwc.
int current = mList ? mList->numHwLayers : 0;
// Do not compose any layer below full-screen Opaque layer
// Note: It can be generalized to non-fullscreen Opaque layers.
bool isOpaque = (opacity == 0xFF) && (aLayer->GetContentFlags() & Layer::CONTENT_OPAQUE);
if (current && isOpaque) {
nsIntRect displayRect = nsIntRect(displayFrame.left, displayFrame.top,
displayFrame.right - displayFrame.left, displayFrame.bottom - displayFrame.top);
if (displayRect.Contains(mScreenRect)) {
// In z-order, all previous layers are below
// the current layer. We can ignore them now.
mList->numHwLayers = current = 0;
mHwcLayerMap.Clear();
}
}
if (!mList || current >= mMaxLayerCount) {
if (!ReallocLayerList() || current >= mMaxLayerCount) {
LOGE("PrepareLayerList failed! Could not increase the maximum layer count");
return false;
}
}
HwcLayer& hwcLayer = mList->hwLayers[current];
hwcLayer.displayFrame = displayFrame;
setCrop(&hwcLayer, sourceCrop);
buffer_handle_t handle = fillColor ? nullptr : state.mSurface->getNativeBuffer()->handle;
hwcLayer.handle = handle;
hwcLayer.flags = 0;
hwcLayer.hints = 0;
hwcLayer.blending = isOpaque ? HWC_BLENDING_NONE : HWC_BLENDING_PREMULT;
#if ANDROID_VERSION >= 17
hwcLayer.compositionType = HWC_FRAMEBUFFER;
hwcLayer.acquireFenceFd = -1;
hwcLayer.releaseFenceFd = -1;
#if ANDROID_VERSION >= 18
hwcLayer.planeAlpha = opacity;
#endif
#else
hwcLayer.compositionType = HwcUtils::HWC_USE_COPYBIT;
#endif
if (!fillColor) {
if (state.FormatRBSwapped()) {
if (!mRBSwapSupport) {
LOGD("No R/B swap support in H/W Composer");
return false;
}
hwcLayer.flags |= HwcUtils::HWC_FORMAT_RB_SWAP;
}
// Translation and scaling have been addressed in PrepareLayerRects().
// Given the above and that we checked for PreservesAxisAlignedRectangles()
// the only possible transformations left to address are
// square angle rotation and horizontal/vertical reflection.
//
// The rotation and reflection permutations total 16 but can be
// reduced to 8 transformations after eliminating redundancies.
//
// All matrices represented here are in the form
//
// | xx xy |
// | yx yy |
//
// And ignore scaling.
//
// Reflection is applied before rotation
gfxMatrix rotation = transform * aGLWorldTransform;
// Compute fuzzy zero like PreservesAxisAlignedRectangles()
if (fabs(rotation.xx) < 1e-6) {
if (rotation.xy < 0) {
if (rotation.yx > 0) {
// 90 degree rotation
//
// | 0 -1 |
// | 1 0 |
//
hwcLayer.transform = HWC_TRANSFORM_ROT_90;
LOGD("Layer rotated 90 degrees");
}
else {
// Horizontal reflection then 90 degree rotation
//
// | 0 -1 | | -1 0 | = | 0 -1 |
// | 1 0 | | 0 1 | | -1 0 |
//
// same as vertical reflection then 270 degree rotation
//
// | 0 1 | | 1 0 | = | 0 -1 |
// | -1 0 | | 0 -1 | | -1 0 |
//
hwcLayer.transform = HWC_TRANSFORM_ROT_90 | HWC_TRANSFORM_FLIP_H;
LOGD("Layer vertically reflected then rotated 270 degrees");
}
} else {
if (rotation.yx < 0) {
// 270 degree rotation
//
// | 0 1 |
// | -1 0 |
//
hwcLayer.transform = HWC_TRANSFORM_ROT_270;
LOGD("Layer rotated 270 degrees");
}
else {
// Vertical reflection then 90 degree rotation
//
// | 0 1 | | -1 0 | = | 0 1 |
// | -1 0 | | 0 1 | | 1 0 |
//
// Same as horizontal reflection then 270 degree rotation
//
// | 0 -1 | | 1 0 | = | 0 1 |
// | 1 0 | | 0 -1 | | 1 0 |
//
hwcLayer.transform = HWC_TRANSFORM_ROT_90 | HWC_TRANSFORM_FLIP_V;
LOGD("Layer horizontally reflected then rotated 270 degrees");
}
}
} else if (rotation.xx < 0) {
if (rotation.yy > 0) {
// Horizontal reflection
//
// | -1 0 |
// | 0 1 |
//
hwcLayer.transform = HWC_TRANSFORM_FLIP_H;
LOGD("Layer rotated 180 degrees");
}
else {
// 180 degree rotation
//
// | -1 0 |
// | 0 -1 |
//
// Same as horizontal and vertical reflection
//
// | -1 0 | | 1 0 | = | -1 0 |
// | 0 1 | | 0 -1 | | 0 -1 |
//
hwcLayer.transform = HWC_TRANSFORM_ROT_180;
LOGD("Layer rotated 180 degrees");
}
} else {
if (rotation.yy < 0) {
// Vertical reflection
//
// | 1 0 |
// | 0 -1 |
//
hwcLayer.transform = HWC_TRANSFORM_FLIP_V;
LOGD("Layer rotated 180 degrees");
}
else {
// No rotation or reflection
//
// | 1 0 |
// | 0 1 |
//
hwcLayer.transform = 0;
}
}
if (state.YFlipped()) {
// Invert vertical reflection flag if it was already set
hwcLayer.transform ^= HWC_TRANSFORM_FLIP_V;
}
hwc_region_t region;
if (visibleRegion.GetNumRects() > 1) {
mVisibleRegions.push_back(HwcUtils::RectVector());
HwcUtils::RectVector* visibleRects = &(mVisibleRegions.back());
if(!HwcUtils::PrepareVisibleRegion(visibleRegion,
transform * aGLWorldTransform,
clip,
bufferRect,
visibleRects)) {
return true;
}
region.numRects = visibleRects->size();
region.rects = &((*visibleRects)[0]);
} else {
region.numRects = 1;
region.rects = &(hwcLayer.displayFrame);
}
hwcLayer.visibleRegionScreen = region;
} else {
hwcLayer.flags |= HwcUtils::HWC_COLOR_FILL;
ColorLayer* colorLayer = aLayer->AsColorLayer();
if (colorLayer->GetColor().a < 1.0) {
LOGD("Color layer has semitransparency which is unsupported");
return false;
}
hwcLayer.transform = colorLayer->GetColor().Packed();
}
mHwcLayerMap.AppendElement(static_cast<LayerComposite*>(aLayer->ImplData()));
mList->numHwLayers++;
return true;
}
#if ANDROID_VERSION >= 17
bool
HwcComposer2D::TryHwComposition()
{
FramebufferSurface* fbsurface = (FramebufferSurface*)(GetGonkDisplay()->GetFBSurface());
if (!(fbsurface && fbsurface->lastHandle)) {
LOGD("H/W Composition failed. FBSurface not initialized.");
return false;
}
// Add FB layer
int idx = mList->numHwLayers++;
if (idx >= mMaxLayerCount) {
if (!ReallocLayerList() || idx >= mMaxLayerCount) {
LOGE("TryHwComposition failed! Could not add FB layer");
return false;
}
}
Prepare(fbsurface->lastHandle, -1);
/* Possible composition paths, after hwc prepare:
1. GPU Composition
2. BLIT Composition
3. Full OVERLAY Composition
4. Partial OVERLAY Composition (GPU + OVERLAY) */
bool gpuComposite = false;
bool blitComposite = false;
bool overlayComposite = true;
for (int j=0; j < idx; j++) {
if (mList->hwLayers[j].compositionType == HWC_FRAMEBUFFER ||
mList->hwLayers[j].compositionType == HWC_BLIT) {
// Full OVERLAY composition is not possible on this frame
// It is either GPU / BLIT / partial OVERLAY composition.
overlayComposite = false;
break;
}
}
if (!overlayComposite) {
for (int k=0; k < idx; k++) {
switch (mList->hwLayers[k].compositionType) {
case HWC_FRAMEBUFFER:
gpuComposite = true;
break;
case HWC_BLIT:
blitComposite = true;
break;
case HWC_OVERLAY:
// HWC will compose HWC_OVERLAY layers in partial
// Overlay Composition, set layer composition flag
// on mapped LayerComposite to skip GPU composition
mHwcLayerMap[k]->SetLayerComposited(true);
if ((mList->hwLayers[k].hints & HWC_HINT_CLEAR_FB) &&
(mList->hwLayers[k].blending == HWC_BLENDING_NONE)) {
// Clear visible rect on FB with transparent pixels.
hwc_rect_t r = mList->hwLayers[k].displayFrame;
mHwcLayerMap[k]->SetClearRect(nsIntRect(r.left, r.top,
r.right - r.left,
r.bottom - r.top));
}
break;
default:
break;
}
}
if (gpuComposite) {
// GPU or partial OVERLAY Composition
return false;
} else if (blitComposite) {
// BLIT Composition, flip FB target
GetGonkDisplay()->UpdateFBSurface(mDpy, mSur);
FramebufferSurface* fbsurface = (FramebufferSurface*)(GetGonkDisplay()->GetFBSurface());
if (!fbsurface) {
LOGE("H/W Composition failed. NULL FBSurface.");
return false;
}
mList->hwLayers[idx].handle = fbsurface->lastHandle;
mList->hwLayers[idx].acquireFenceFd = fbsurface->GetPrevFBAcquireFd();
}
}
// BLIT or full OVERLAY Composition
Commit();
GetGonkDisplay()->SetFBReleaseFd(mList->hwLayers[idx].releaseFenceFd);
return true;
}
bool
HwcComposer2D::Render(EGLDisplay dpy, EGLSurface sur)
{
if (!mList) {
// After boot, HWC list hasn't been created yet
return GetGonkDisplay()->SwapBuffers(dpy, sur);
}
GetGonkDisplay()->UpdateFBSurface(dpy, sur);
FramebufferSurface* fbsurface = (FramebufferSurface*)(GetGonkDisplay()->GetFBSurface());
if (!fbsurface) {
LOGE("H/W Composition failed. FBSurface not initialized.");
return false;
}
if (mPrepared) {
// No mHwc prepare, if already prepared in current draw cycle
mList->hwLayers[mList->numHwLayers - 1].handle = fbsurface->lastHandle;
mList->hwLayers[mList->numHwLayers - 1].acquireFenceFd = fbsurface->GetPrevFBAcquireFd();
} else {
mList->flags = HWC_GEOMETRY_CHANGED;
mList->numHwLayers = 2;
mList->hwLayers[0].hints = 0;
mList->hwLayers[0].compositionType = HWC_FRAMEBUFFER;
mList->hwLayers[0].flags = HWC_SKIP_LAYER;
mList->hwLayers[0].backgroundColor = {0};
mList->hwLayers[0].acquireFenceFd = -1;
mList->hwLayers[0].releaseFenceFd = -1;
mList->hwLayers[0].displayFrame = {0, 0, mScreenRect.width, mScreenRect.height};
Prepare(fbsurface->lastHandle, fbsurface->GetPrevFBAcquireFd());
}
// GPU or partial HWC Composition
Commit();
GetGonkDisplay()->SetFBReleaseFd(mList->hwLayers[mList->numHwLayers - 1].releaseFenceFd);
return true;
}
void
HwcComposer2D::Prepare(buffer_handle_t fbHandle, int fence)
{
int idx = mList->numHwLayers - 1;
const hwc_rect_t r = {0, 0, mScreenRect.width, mScreenRect.height};
hwc_display_contents_1_t *displays[HWC_NUM_DISPLAY_TYPES] = { nullptr };
displays[HWC_DISPLAY_PRIMARY] = mList;
mList->outbufAcquireFenceFd = -1;
mList->outbuf = nullptr;
mList->retireFenceFd = -1;
mList->hwLayers[idx].hints = 0;
mList->hwLayers[idx].flags = 0;
mList->hwLayers[idx].transform = 0;
mList->hwLayers[idx].handle = fbHandle;
mList->hwLayers[idx].blending = HWC_BLENDING_PREMULT;
mList->hwLayers[idx].compositionType = HWC_FRAMEBUFFER_TARGET;
setCrop(&mList->hwLayers[idx], r);
mList->hwLayers[idx].displayFrame = r;
mList->hwLayers[idx].visibleRegionScreen.numRects = 1;
mList->hwLayers[idx].visibleRegionScreen.rects = &mList->hwLayers[idx].displayFrame;
mList->hwLayers[idx].acquireFenceFd = fence;
mList->hwLayers[idx].releaseFenceFd = -1;
#if ANDROID_VERSION >= 18
mList->hwLayers[idx].planeAlpha = 0xFF;
#endif
if (mPrepared) {
LOGE("Multiple hwc prepare calls!");
}
mHwc->prepare(mHwc, HWC_NUM_DISPLAY_TYPES, displays);
mPrepared = true;
}
bool
HwcComposer2D::Commit()
{
hwc_display_contents_1_t *displays[HWC_NUM_DISPLAY_TYPES] = { nullptr };
displays[HWC_DISPLAY_PRIMARY] = mList;
int err = mHwc->set(mHwc, HWC_NUM_DISPLAY_TYPES, displays);
mPrevDisplayFence = mPrevRetireFence;
mPrevRetireFence = Fence::NO_FENCE;
for (uint32_t j=0; j < (mList->numHwLayers - 1); j++) {
if (mList->hwLayers[j].releaseFenceFd >= 0) {
int fd = mList->hwLayers[j].releaseFenceFd;
mList->hwLayers[j].releaseFenceFd = -1;
sp<Fence> fence = new Fence(fd);
LayerRenderState state = mHwcLayerMap[j]->GetLayer()->GetRenderState();
if (!state.mTexture) {
continue;
}
TextureHostOGL* texture = state.mTexture->AsHostOGL();
if (!texture) {
continue;
}
texture->SetReleaseFence(fence);
}
}
if (mList->retireFenceFd >= 0) {
mPrevRetireFence = new Fence(mList->retireFenceFd);
}
mPrepared = false;
return !err;
}
void
HwcComposer2D::Reset()
{
LOGD("hwcomposer is already prepared, reset with null set");
hwc_display_contents_1_t *displays[HWC_NUM_DISPLAY_TYPES] = { nullptr };
displays[HWC_DISPLAY_PRIMARY] = nullptr;
mHwc->set(mHwc, HWC_DISPLAY_PRIMARY, displays);
mPrepared = false;
}
#else
bool
HwcComposer2D::TryHwComposition()
{
return !mHwc->set(mHwc, mDpy, mSur, mList);
}
bool
HwcComposer2D::Render(EGLDisplay dpy, EGLSurface sur)
{
return GetGonkDisplay()->SwapBuffers(dpy, sur);
}
void
HwcComposer2D::Reset()
{
mPrepared = false;
}
#endif
bool
HwcComposer2D::TryRender(Layer* aRoot,
const gfx::Matrix& GLWorldTransform,
bool aGeometryChanged)
{
gfxMatrix aGLWorldTransform = ThebesMatrix(GLWorldTransform);
if (!aGLWorldTransform.PreservesAxisAlignedRectangles()) {
LOGD("Render aborted. World transform has non-square angle rotation");
return false;
}
MOZ_ASSERT(Initialized());
if (mList) {
setHwcGeometry(aGeometryChanged);
mList->numHwLayers = 0;
mHwcLayerMap.Clear();
}
if (mPrepared) {
Reset();
}
// XXX: The clear() below means all rect vectors will be have to be
// reallocated. We may want to avoid this if possible
mVisibleRegions.clear();
MOZ_ASSERT(mHwcLayerMap.IsEmpty());
if (!PrepareLayerList(aRoot,
mScreenRect,
gfxMatrix(),
aGLWorldTransform))
{
LOGD("Render aborted. Nothing was drawn to the screen");
return false;
}
if (!TryHwComposition()) {
LOGD("H/W Composition failed");
return false;
}
LOGD("Frame rendered");
return true;
}
} // namespace mozilla
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