Samsung S5PC100 User Manual page 1207

2D-ACCELERATOR
5.3 CLIPPING
Clipping discards the pixels (after rotation) outside the clipping window. The discarded pixels will not go through
the rest of rendering pipelines.
NOTE: The clipping windows must reside totally inside the screen. Setting the clipping window the same size with the screen
disables the clipping effect, and a clipping window bigger than the screen size is not allowed.
Related Registers
CW_LT_REG
CW_RB_REG
5.4 STENCIL TEST
The Stencil Test conditionally discards a pixel based on the outcome of a comparison between the color value of
this pixel of the source image and the DR (min)/DR(max) values. If each field (R, G, B, A) of the color value falls in
the range of [DR (min), DR (max)], this pixel is passed to the next stage; otherwise, discarded. User can disable
the stencil test on a specific field by clearing the corresponding bits in COLORKEY_CNTL. Note that each field of
DR_MIN and DR_MAX is 8-bit wide, regardless of the source color mode setting.
9.5-8
Original image
FIMG-2D
270°
Figure 9.5-2 Rotation Example
Coordinates of the leftmost topmost point of the clipping window
Coordinates of the rightmost bottommost point of the clipping window
90°
X-axis flip
S5PC100 USER'S MANUAL (REV1.0)
180°
Y-axis flip