SH7205 Datasheet, PDF (1483/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 26 2D Graphics Engine (2DG)
(6) Duplicate-Line Setting of Enlargement Resizing
When performing an enlargement resizing in the vertical direction, in some cases image data of
the source image on the memory is used twice in succession by line. For this reason, the pixel data
(in units of lines) of the lines used twice needs to be transferred by the CPU to the 2DG twice in
succession.
(a) Subject conditions
Duplicate setting applies to the case where a source image, whose horizontal pixel count is larger
than the bank size (64 pixels) of the buffer, is to be resized vertically for enlargement (the
horizontal resizing ratio is not applicable). In other words, duplicate setting applies to the cases
where
horizontal pixel count of source image ≥ 65 and vertical enlargement resizing.
Figures 26.45 and 26.46 illustrate examples.
70 pixels
70 pixels
Source image
60 lines
H direction = ×1.0
V direction = ×1.5
Resized image _{90 lines}
Figure 26.45 Example of Duplicate-line Setting of Enlargement Resizing (1)
70 pixels
Source image
60 lines
H direction = ×2.0
V direction = ×2.0
140 pixels
Resized image
120 lines
Figure 26.46 Example of Duplicate-line Setting of Enlargement Resizing (2)
Rev. 1.00 Mar. 25, 2008 Page 1451 of 1868
REJ09B0372-0100