SH7205 Datasheet, PDF (1470/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 26 2D Graphics Engine (2DG)
(c) Horizontal/vertical starting phase for the source (H1PHS_DCML bits of GR_HSPHAS
register /V1PHS_DCML bits of GR_VSPHAS register)
When performing partial resizing, it is necessary to consider the starting phase of the starting pixel
for the full resizing in addition to the set area for the partial resizing, in order to ensure that the
complete match of the boundary between the output image that is fully resized in advance and the
output image that is partially resized later. For example, if the horizontal starting phase
(H1PHS_DCML) for the source for full resizing is defined as H'FFF, the same value as full
resizing (H'FFF) must also be added to the starting phase (H1PHS_DCML) when partial resizing
is performed.
If the parameter H1PHS_DCML or V1PHS_DCML is to be used during the full resizing process,
constraint conditions vary between enlargement resizing and reduction resizing; therefore, each
parameter should be set in the following ranges:
[Enlargement]
H1PHS_DCML or V1PHS_DCML = H'000 to H'(HDLT_DCML − 1)
[Reduction]
H1PHS_DCML or V1PHS_DCML = H'000 to H'FFF
(d) Determining the area to set up for partial resizing
In figure 26.40, ST, SL, SSHIGH, and SSWIDH are values to be obtained by the user. The other
values are known.
Full resize set area
on source side
ST' SB' ST
SL'
Partial resize set area
on source side
Actually updated area
(update area)
SV
SR'
SL
SSHIGH
SSWIDH
SH
Figure 26.40 Partial Resizing Set Area in Source Data Area
Rev. 1.00 Mar. 25, 2008 Page 1438 of 1868
REJ09B0372-0100