SH7205 Datasheet, PDF (1466/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 26 2D Graphics Engine (2DG)
The register settings for the horizontal width and vertical height of the source area are specified by
determining a setting area appropriate for partial resizing, instead of specifying the updated area
itself, according to the following equations, and by assigning the results to the GR_HSPHAS and
GR_VSPHAS registers:
Vertical offset = Va1 = Va − Vx1, horizontal offset: Ha1 = Ha − Hx1
Vertical height: Vb1 = Vb + Vx1 + Vx2, horizontal width: Hb1 = Hb1 + Hx1 + Hx2
Source plane area = source area allocated on memory
Source plane area
Source area
Va
Ha
Update area _Vb
Hb
Source update area (= Hb × Vb)
(Data-modified area)
Source plane area
Source area
Va1
Vx1
Ha1
Hx1 Update area
Vb1
Vx2 Hx2
Hb1
Source set area (= Hb1 × Vb1)
(Area used for partial extraction)
Figure 26.36 Setting Areas for Partial Extraction Resizing
Rev. 1.00 Mar. 25, 2008 Page 1434 of 1868
REJ09B0372-0100