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SurfaceTexture: shrink all sides when cropping

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This change makes SurfaceTexture include an offset for all sides of the crop
region when cropping.  This keeps the image centered, to minimize the visual
changes when switching between the texture transform matrix-based cropping and
something that does proper cropping (e.g. HWComposer).

Change-Id: I541d3046fd92e49221b488444df36d490924d1c5
This commit is contained in:
Jamie Gennis 2012-04-16 13:41:05 -07:00
parent 172a62a224
commit 91a6826d67
2 changed files with 13 additions and 25 deletions
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32
libs/gui/SurfaceTexture.cpp
View File

@ -542,28 +542,16 @@ void SurfaceTexture::computeCurrentTransformMatrix() {
// decoder, camera, etc.) would simply not use a crop rectangle (or at
// least not tell the framework about it) so that the GPU can do the
// correct edge behavior.
int xshrink = 0, yshrink = 0;
if (mCurrentCrop.left > 0) {
tx = float(mCurrentCrop.left + 1) / float(buf->getWidth());
xshrink++;
} else {
tx = 0.0f;
}
if (mCurrentCrop.right < int32_t(buf->getWidth())) {
xshrink++;
}
if (mCurrentCrop.bottom < int32_t(buf->getHeight())) {
ty = (float(buf->getHeight() - mCurrentCrop.bottom) + 1.0f) /
float(buf->getHeight());
yshrink++;
} else {
ty = 0.0f;
}
if (mCurrentCrop.top > 0) {
yshrink++;
}
sx = float(mCurrentCrop.width() - xshrink) / float(buf->getWidth());
sy = float(mCurrentCrop.height() - yshrink) / float(buf->getHeight());
const float shrinkAmount = 1.0f; // the amount that each edge is shrunk
tx = (float(mCurrentCrop.left) + shrinkAmount) /
float(buf->getWidth());
ty = (float(buf->getHeight() - mCurrentCrop.bottom) +
shrinkAmount) / float(buf->getHeight());
sx = (float(mCurrentCrop.width()) - (2.0f * shrinkAmount)) /
float(buf->getWidth());
sy = (float(mCurrentCrop.height()) - (2.0f * shrinkAmount)) /
float(buf->getHeight());
} else {
tx = 0.0f;
ty = 0.0f;

6
libs/gui/tests/SurfaceTextureClient_test.cpp
View File

@ -580,13 +580,13 @@ TEST_F(SurfaceTextureClientTest, GetTransformMatrixSucceedsAfterFreeingBuffersWi
// This accounts for the 1 texel shrink for each edge that's included in the
// transform matrix to avoid texturing outside the crop region.
EXPECT_EQ(.5f, mtx[0]);
EXPECT_EQ(.375f, mtx[0]);
EXPECT_EQ(0.f, mtx[1]);
EXPECT_EQ(0.f, mtx[2]);
EXPECT_EQ(0.f, mtx[3]);
EXPECT_EQ(0.f, mtx[4]);
EXPECT_EQ(-.5f, mtx[5]);
EXPECT_EQ(-.375f, mtx[5]);
EXPECT_EQ(0.f, mtx[6]);
EXPECT_EQ(0.f, mtx[7]);
@ -595,7 +595,7 @@ TEST_F(SurfaceTextureClientTest, GetTransformMatrixSucceedsAfterFreeingBuffersWi
EXPECT_EQ(1.f, mtx[10]);
EXPECT_EQ(0.f, mtx[11]);
EXPECT_EQ(0.f, mtx[12]);
EXPECT_EQ(.125f, mtx[12]);
EXPECT_EQ(.5f, mtx[13]);
EXPECT_EQ(0.f, mtx[14]);
EXPECT_EQ(1.f, mtx[15]);