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;
const gfx3DMatrix& transform3D = aLayer->GetEffectiveTransform();
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;
}
// OK! We can compose this layer with hwc.
int current = mList ? mList->numHwLayers : 0;
if (!mList || current >= mMaxLayerCount) {
if (!ReallocLayerList() || current >= mMaxLayerCount) {
LOGE("PrepareLayerList failed! Could not increase the maximum layer count");
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);
}
}
HwcLayer& hwcLayer = mList->hwLayers[current];
if(!HwcUtils::PrepareLayerRects(visibleRect,
transform * aGLWorldTransform,
clip,
bufferRect,
&(hwcLayer.sourceCrop),
&(hwcLayer.displayFrame)))
{
return true;
}
buffer_handle_t handle = fillColor ? nullptr : state.mSurface->getNativeBuffer()->handle;
hwcLayer.handle = handle;
hwcLayer.flags = 0;
hwcLayer.hints = 0;
hwcLayer.blending = HWC_BLENDING_PREMULT;
#if ANDROID_VERSION >= 18
hwcLayer.compositionType = HWC_FRAMEBUFFER;
hwcLayer.acquireFenceFd = -1;
hwcLayer.releaseFenceFd = -1;
hwcLayer.planeAlpha = opacity;
#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;
}
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;
}
float opacity = aLayer->GetEffectiveOpacity();
if (opacity <= 0) {
LOGD("Layer is fully transparent so skip rendering");
return true;
}
else if (opacity < 1) {
LOGD("Layer has planar semitransparency which is unsupported");
return false;
}
if (visibleRegion.GetNumRects() > 1) {
// FIXME/bug 808339
LOGD("Layer has nontrivial visible region");
return false;
}
nsIntRect clip;
if (!CalculateClipRect(aParentTransform * aGLWorldTransform,
aLayer->GetEffectiveClipRect(),
aClip,
&clip))
{
LOGD("Clip rect is empty. Skip layer");
return true;
}
gfxMatrix transform;
const gfx3DMatrix& transform3D = aLayer->GetEffectiveTransform();
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;
}
LayerOGL* layerGL = static_cast<LayerOGL*>(aLayer->ImplData());
LayerRenderState state = layerGL->GetRenderState();
if (!state.mSurface ||
state.mSurface->type() != SurfaceDescriptor::TSurfaceDescriptorGralloc) {
if (aLayer->AsColorLayer() && mColorFill) {
fillColor = true;
} else {
LOGD("Layer doesn't have a gralloc buffer");
return false;
}
}
if (state.BufferRotated()) {
LOGD("Layer has a rotated buffer");
return false;
}
// OK! We can compose this layer with hwc.
int current = mList ? mList->numHwLayers : 0;
if (!mList || current >= mMaxLayerCount) {
if (!ReallocLayerList() || current >= mMaxLayerCount) {
LOGE("PrepareLayerList failed! Could not increase the maximum layer count");
return false;
}
}
sp<GraphicBuffer> buffer = fillColor ? nullptr : GrallocBufferActor::GetFrom(*state.mSurface);
nsIntRect visibleRect = visibleRegion.GetBounds();
nsIntRect bufferRect;
if (fillColor) {
bufferRect = nsIntRect(visibleRect);
} else {
if(state.mHasOwnOffset) {
bufferRect = nsIntRect(state.mOffset.x, state.mOffset.y,
int(buffer->getWidth()), int(buffer->getHeight()));
} else {
bufferRect = nsIntRect(visibleRect.x, visibleRect.y,
int(buffer->getWidth()), int(buffer->getHeight()));
}
}
hwc_layer_t& hwcLayer = mList->hwLayers[current];
if(!PrepareLayerRects(visibleRect,
transform * aGLWorldTransform,
clip,
bufferRect,
&(hwcLayer.sourceCrop),
&(hwcLayer.displayFrame)))
{
return true;
}
buffer_handle_t handle = fillColor ? nullptr : buffer->getNativeBuffer()->handle;
hwcLayer.handle = handle;
hwcLayer.flags = 0;
hwcLayer.hints = 0;
hwcLayer.blending = HWC_BLENDING_NONE;
hwcLayer.compositionType = HWC_USE_COPYBIT;
if (!fillColor) {
gfxMatrix rotation = transform * aGLWorldTransform;
// Compute fuzzy equal like PreservesAxisAlignedRectangles()
if (fabs(rotation.xx) < 1e-6) {
if (rotation.xy < 0) {
hwcLayer.transform = HWC_TRANSFORM_ROT_90;
LOGD("Layer buffer rotated 90 degrees");
} else {
hwcLayer.transform = HWC_TRANSFORM_ROT_270;
LOGD("Layer buffer rotated 270 degrees");
}
} else if (rotation.xx < 0) {
hwcLayer.transform = HWC_TRANSFORM_ROT_180;
LOGD("Layer buffer rotated 180 degrees");
} else {
hwcLayer.transform = 0;
}
hwcLayer.transform |= state.YFlipped() ? HWC_TRANSFORM_FLIP_V : 0;
hwc_region_t region;
region.numRects = 1;
region.rects = &(hwcLayer.displayFrame);
hwcLayer.visibleRegionScreen = region;
} else {
hwcLayer.flags |= HWC_COLOR_FILL;
ColorLayer* colorLayer = static_cast<ColorLayer*>(layerGL->GetLayer());
hwcLayer.transform = colorLayer->GetColor().Packed();
}
mList->numHwLayers++;
return true;
}
