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Fix SurfaceTexture transform matrix. 

Change-Id: I31520c547cafa5cc85cd0f73883ab3a9ff4648e2
This commit is contained in:
Jamie Gennis 2011-01-14 13:53:31 -08:00
parent 361dcc75b1
commit a214c64d7f
1 changed files with 48 additions and 30 deletions
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78
libs/gui/SurfaceTexture.cpp
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@ -237,43 +237,61 @@ void SurfaceTexture::getTransformMatrix(float mtx[16]) {
LOGV("SurfaceTexture::updateTexImage");
Mutex::Autolock lock(mMutex);
float* xform = mtxIdentity;
switch (mCurrentTransform) {
case 0:
xform = mtxIdentity;
break;
case NATIVE_WINDOW_TRANSFORM_FLIP_H:
xform = mtxFlipH;
break;
case NATIVE_WINDOW_TRANSFORM_FLIP_V:
xform = mtxFlipV;
break;
case NATIVE_WINDOW_TRANSFORM_ROT_90:
xform = mtxRot90;
break;
case NATIVE_WINDOW_TRANSFORM_ROT_180:
xform = mtxRot180;
break;
case NATIVE_WINDOW_TRANSFORM_ROT_270:
xform = mtxRot270;
break;
default:
LOGE("getTransformMatrix: unknown transform: %d", mCurrentTransform);
float xform[16];
for (int i = 0; i < 16; i++) {
xform[i] = mtxIdentity[i];
}
if (mCurrentTransform & NATIVE_WINDOW_TRANSFORM_FLIP_H) {
float result[16];
mtxMul(result, xform, mtxFlipH);
for (int i = 0; i < 16; i++) {
xform[i] = result[i];
}
}
if (mCurrentTransform & NATIVE_WINDOW_TRANSFORM_FLIP_V) {
float result[16];
mtxMul(result, xform, mtxFlipV);
for (int i = 0; i < 16; i++) {
xform[i] = result[i];
}
}
if (mCurrentTransform & NATIVE_WINDOW_TRANSFORM_ROT_90) {
float result[16];
mtxMul(result, xform, mtxRot90);
for (int i = 0; i < 16; i++) {
xform[i] = result[i];
}
}
sp<GraphicBuffer>& buf(mSlots[mCurrentTexture].mGraphicBuffer);
float tx = float(mCurrentCrop.left) / float(buf->getWidth());
float ty = float(mCurrentCrop.bottom) / float(buf->getHeight());
float sx = float(mCurrentCrop.width()) / float(buf->getWidth());
float sy = float(mCurrentCrop.height()) / float(buf->getHeight());
float tx, ty, sx, sy;
if (!mCurrentCrop.isEmpty()) {
tx = float(mCurrentCrop.left) / float(buf->getWidth());
ty = float(buf->getHeight() - mCurrentCrop.bottom) /
float(buf->getHeight());
sx = float(mCurrentCrop.width()) / float(buf->getWidth());
sy = float(mCurrentCrop.height()) / float(buf->getHeight());
} else {
tx = 0.0f;
ty = 0.0f;
sx = 1.0f;
sy = 1.0f;
}
float crop[16] = {
sx, 0, 0, sx*tx,
0, sy, 0, sy*ty,
sx, 0, 0, 0,
0, sy, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1,
sx*tx, sy*ty, 0, 1,
};
mtxMul(mtx, crop, xform);
float mtxBeforeFlipV[16];
mtxMul(mtxBeforeFlipV, crop, xform);
// SurfaceFlinger expects the top of its window textures to be at a Y
// coordinate of 0, so SurfaceTexture must behave the same way. We don't
// want to expose this to applications, however, so we must add an
// additional vertical flip to the transform after all the other transforms.
mtxMul(mtx, mtxFlipV, mtxBeforeFlipV);
}
void SurfaceTexture::freeAllBuffers() {