void
BasicCompositor::DrawQuad(const gfx::Rect& aRect,
const gfx::Rect& aClipRect,
const EffectChain &aEffectChain,
gfx::Float aOpacity,
const gfx::Matrix4x4& aTransform,
const gfx::Rect& aVisibleRect)
{
RefPtr<DrawTarget> buffer = mRenderTarget->mDrawTarget;
// For 2D drawing, |dest| and |buffer| are the same surface. For 3D drawing,
// |dest| is a temporary surface.
RefPtr<DrawTarget> dest = buffer;
buffer->PushClipRect(aClipRect);
AutoRestoreTransform autoRestoreTransform(dest);
Matrix newTransform;
Rect transformBounds;
gfx3DMatrix new3DTransform;
IntPoint offset = mRenderTarget->GetOrigin();
if (aTransform.Is2D()) {
newTransform = aTransform.As2D();
} else {
// Create a temporary surface for the transform.
dest = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(RoundOut(aRect).Size(), SurfaceFormat::B8G8R8A8);
if (!dest) {
return;
}
dest->SetTransform(Matrix::Translation(-aRect.x, -aRect.y));
// Get the bounds post-transform.
new3DTransform = To3DMatrix(aTransform);
gfxRect bounds = new3DTransform.TransformBounds(ThebesRect(aRect));
bounds.IntersectRect(bounds, gfxRect(offset.x, offset.y, buffer->GetSize().width, buffer->GetSize().height));
transformBounds = ToRect(bounds);
transformBounds.RoundOut();
// Propagate the coordinate offset to our 2D draw target.
newTransform = Matrix::Translation(transformBounds.x, transformBounds.y);
// When we apply the 3D transformation, we do it against a temporary
// surface, so undo the coordinate offset.
new3DTransform = gfx3DMatrix::Translation(aRect.x, aRect.y, 0) * new3DTransform;
}
newTransform.PostTranslate(-offset.x, -offset.y);
buffer->SetTransform(newTransform);
RefPtr<SourceSurface> sourceMask;
Matrix maskTransform;
if (aEffectChain.mSecondaryEffects[EffectTypes::MASK]) {
EffectMask *effectMask = static_cast<EffectMask*>(aEffectChain.mSecondaryEffects[EffectTypes::MASK].get());
sourceMask = effectMask->mMaskTexture->AsSourceBasic()->GetSurface(dest);
MOZ_ASSERT(effectMask->mMaskTransform.Is2D(), "How did we end up with a 3D transform here?!");
MOZ_ASSERT(!effectMask->mIs3D);
maskTransform = effectMask->mMaskTransform.As2D();
maskTransform.PreTranslate(-offset.x, -offset.y);
}
switch (aEffectChain.mPrimaryEffect->mType) {
case EffectTypes::SOLID_COLOR: {
EffectSolidColor* effectSolidColor =
static_cast<EffectSolidColor*>(aEffectChain.mPrimaryEffect.get());
FillRectWithMask(dest, aRect, effectSolidColor->mColor,
DrawOptions(aOpacity), sourceMask, &maskTransform);
break;
}
case EffectTypes::RGB: {
TexturedEffect* texturedEffect =
static_cast<TexturedEffect*>(aEffectChain.mPrimaryEffect.get());
TextureSourceBasic* source = texturedEffect->mTexture->AsSourceBasic();
if (texturedEffect->mPremultiplied) {
DrawSurfaceWithTextureCoords(dest, aRect,
source->GetSurface(dest),
texturedEffect->mTextureCoords,
texturedEffect->mFilter,
aOpacity, sourceMask, &maskTransform);
} else {
RefPtr<DataSourceSurface> srcData = source->GetSurface(dest)->GetDataSurface();
// Yes, we re-create the premultiplied data every time.
// This might be better with a cache, eventually.
RefPtr<DataSourceSurface> premultData = gfxUtils::CreatePremultipliedDataSurface(srcData);
DrawSurfaceWithTextureCoords(dest, aRect,
premultData,
texturedEffect->mTextureCoords,
texturedEffect->mFilter,
aOpacity, sourceMask, &maskTransform);
}
break;
}
case EffectTypes::YCBCR: {
NS_RUNTIMEABORT("Can't (easily) support component alpha with BasicCompositor!");
break;
}
case EffectTypes::RENDER_TARGET: {
EffectRenderTarget* effectRenderTarget =
static_cast<EffectRenderTarget*>(aEffectChain.mPrimaryEffect.get());
RefPtr<BasicCompositingRenderTarget> surface
= static_cast<BasicCompositingRenderTarget*>(effectRenderTarget->mRenderTarget.get());
RefPtr<SourceSurface> sourceSurf = surface->mDrawTarget->Snapshot();
DrawSurfaceWithTextureCoords(dest, aRect,
sourceSurf,
effectRenderTarget->mTextureCoords,
effectRenderTarget->mFilter,
aOpacity, sourceMask, &maskTransform);
break;
}
case EffectTypes::COMPONENT_ALPHA: {
NS_RUNTIMEABORT("Can't (easily) support component alpha with BasicCompositor!");
break;
}
default: {
NS_RUNTIMEABORT("Invalid effect type!");
break;
}
}
if (!aTransform.Is2D()) {
dest->Flush();
RefPtr<SourceSurface> snapshot = dest->Snapshot();
RefPtr<DataSourceSurface> source = snapshot->GetDataSurface();
RefPtr<DataSourceSurface> temp =
Factory::CreateDataSourceSurface(RoundOut(transformBounds).Size(), SurfaceFormat::B8G8R8A8
#ifdef MOZ_ENABLE_SKIA
, true
#endif
);
if (NS_WARN_IF(!temp)) {
buffer->PopClip();
return;
}
Transform(temp, source, new3DTransform, transformBounds.TopLeft());
transformBounds.MoveTo(0, 0);
buffer->DrawSurface(temp, transformBounds, transformBounds);
}
buffer->PopClip();
}
/**
* Determine if this transform layer should be drawn before another when they
* are both preserve-3d children.
*
* We want to find the relative z depths of the 2 layers at points where they
* intersect when projected onto the 2d screen plane. Intersections are defined
* as corners that are positioned within the other quad, as well as intersections
* of the lines.
*
* We then choose the intersection point with the greatest difference in Z
* depths and use this point to determine an ordering for the two layers.
* For layers that are intersecting in 3d space, this essentially guesses an
* order. In a lot of cases we only intersect right at the edge point (3d cubes
* in particular) and this generates the 'correct' looking ordering. For planes
* that truely intersect, then there is no correct ordering and this remains
* unsolved without changing our rendering code.
*/
static LayerSortOrder CompareDepth(Layer* aOne, Layer* aTwo) {
gfxRect ourRect = aOne->GetEffectiveVisibleRegion().GetBounds();
gfxRect otherRect = aTwo->GetEffectiveVisibleRegion().GetBounds();
gfx3DMatrix ourTransform;
To3DMatrix(aOne->GetTransform(), ourTransform);
gfx3DMatrix otherTransform;
To3DMatrix(aTwo->GetTransform(), otherTransform);
// Transform both rectangles and project into 2d space.
gfxQuad ourTransformedRect = ourTransform.TransformRect(ourRect);
gfxQuad otherTransformedRect = otherTransform.TransformRect(otherRect);
gfxRect ourBounds = ourTransformedRect.GetBounds();
gfxRect otherBounds = otherTransformedRect.GetBounds();
if (!ourBounds.Intersects(otherBounds)) {
return Undefined;
}
// Make a list of all points that are within the other rect.
// Could we just check Contains() on the bounds rects. ie, is it possible
// for layers to overlap without intersections (in 2d space) and yet still
// have their bounds rects not completely enclose each other?
nsTArray<gfxPoint> points;
for (uint32_t i = 0; i < 4; i++) {
if (ourTransformedRect.Contains(otherTransformedRect.mPoints[i])) {
points.AppendElement(otherTransformedRect.mPoints[i]);
}
if (otherTransformedRect.Contains(ourTransformedRect.mPoints[i])) {
points.AppendElement(ourTransformedRect.mPoints[i]);
}
}
// Look for intersections between lines (in 2d space) and use these as
// depth testing points.
for (uint32_t i = 0; i < 4; i++) {
for (uint32_t j = 0; j < 4; j++) {
gfxPoint intersection;
gfxLineSegment one(ourTransformedRect.mPoints[i],
ourTransformedRect.mPoints[(i + 1) % 4]);
gfxLineSegment two(otherTransformedRect.mPoints[j],
otherTransformedRect.mPoints[(j + 1) % 4]);
if (one.Intersects(two, intersection)) {
points.AppendElement(intersection);
}
}
}
// No intersections, no defined order between these layers.
if (points.IsEmpty()) {
return Undefined;
}
// Find the relative Z depths of each intersection point and check that the layers are in the same order.
gfxFloat highest = 0;
for (uint32_t i = 0; i < points.Length(); i++) {
gfxFloat ourDepth = RecoverZDepth(ourTransform, points.ElementAt(i));
gfxFloat otherDepth = RecoverZDepth(otherTransform, points.ElementAt(i));
gfxFloat difference = otherDepth - ourDepth;
if (fabs(difference) > fabs(highest)) {
highest = difference;
}
}
// If layers have the same depth keep the original order
if (fabs(highest) < 0.1 || highest >= 0) {
return ABeforeB;
} else {
return BBeforeA;
}
}
