Fix SurfaceTexture transform matrix.

    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() {