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Add clamp to Layer and update Transform inverse.

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Ensure that the adjusted transparent region is within
the display bounds by clamping after the transformation
is applied and clean up transform's inverse function.

Bug: 18452546

Change-Id: Ia473e483ee8374177bcb84d8192eb1f0e86f022a
This commit is contained in:
Michael Lentine 2014-11-19 18:32:37 -08:00
parent 6b9454d1fe
commit 28ea217ff4
2 changed files with 28 additions and 16 deletions
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15
services/surfaceflinger/Layer.cpp
View File

@ -332,8 +332,12 @@ FloatRect Layer::computeCrop(const sp<const DisplayDevice>& hw) const {
activeCrop.intersect(hw->getViewport(), &activeCrop);
activeCrop = s.transform.inverse().transform(activeCrop);
// paranoia: make sure the window-crop is constrained in the
// window's bounds
// This needs to be here as transform.transform(Rect) computes the
// transformed rect and then takes the bounding box of the result before
// returning. This means
// transform.inverse().transform(transform.transform(Rect)) != Rect
// in which case we need to make sure the final rect is clipped to the
// display bounds.
activeCrop.intersect(Rect(s.active.w, s.active.h), &activeCrop);
// subtract the transparent region and snap to the bounds
@ -432,6 +436,13 @@ void Layer::setGeometry(
activeCrop = s.transform.transform(activeCrop);
activeCrop.intersect(hw->getViewport(), &activeCrop);
activeCrop = s.transform.inverse().transform(activeCrop);
// This needs to be here as transform.transform(Rect) computes the
// transformed rect and then takes the bounding box of the result before
// returning. This means
// transform.inverse().transform(transform.transform(Rect)) != Rect
// in which case we need to make sure the final rect is clipped to the
// display bounds.
activeCrop.intersect(Rect(s.active.w, s.active.h), &activeCrop);
// mark regions outside the crop as transparent
activeTransparentRegion.orSelf(Rect(0, 0, s.active.w, activeCrop.top));
activeTransparentRegion.orSelf(Rect(0, activeCrop.bottom,

29
services/surfaceflinger/Transform.cpp
View File

@ -301,16 +301,16 @@ Transform Transform::inverse() const {
// (T*M)^-1 = M^-1 * T^-1
Transform result;
if (mType <= TRANSLATE) {
// 1 0 x
// 0 1 y
// 0 0 1
// 1 0 0
// 0 1 0
// x y 1
result = *this;
result.mMatrix[2][0] = -result.mMatrix[2][0];
result.mMatrix[2][1] = -result.mMatrix[2][1];
} else {
// a c x
// b d y
// 0 0 1
// a c 0
// b d 0
// x y 1
const mat33& M(mMatrix);
const float a = M[0][0];
const float b = M[1][0];
@ -319,16 +319,17 @@ Transform Transform::inverse() const {
const float x = M[2][0];
const float y = M[2][1];
Transform R, T;
const float idet = 1.0 / (a*d - b*c);
R.mMatrix[0][0] = d*idet; R.mMatrix[0][1] = -c*idet;
R.mMatrix[1][0] = -b*idet; R.mMatrix[1][1] = a*idet;
R.mType = mType &= ~TRANSLATE;
result.mMatrix[0][0] = d*idet;
result.mMatrix[0][1] = -c*idet;
result.mMatrix[1][0] = -b*idet;
result.mMatrix[1][1] = a*idet;
result.mType = mType;
T.mMatrix[2][0] = -x;
T.mMatrix[2][1] = -y;
T.mType = TRANSLATE;
result = R * T;
vec2 T(-x, -y);
T = result.transform(T);
result.mMatrix[2][0] = T[0];
result.mMatrix[2][1] = T[1];
}
return result;
}