SH7764 Datasheet, PDF (1134/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 23 G2D
Figure 23.2 Example of Antialias Specification
23.1.3 Coordinate Systems
The G2D has four 2-dimensional coordinate systems (screen coordinates, rendering coordinates,
2-dimensional source coordinates, and work coordinates), and one 1-dimensional coordinate
system (1-dimensional source coordinates).
Screen coordinates are the display control coordinates. Screen coordinate X corresponds to the
horizontal dimension of the display screen and Y to the vertical dimension. The origin is the top-
left corner in the display screen. The screen coordinate positive directions are right for the X-axis
and down for the Y-axis. Either 16 bits (16 bits/pixel) or 8 bits (8 bits/pixel) can be selected as the
data width of one screen coordinate.
Rendering coordinates are drawing control coordinates. Rendering coordinates are shifted
horizontally and vertically with respect to screen coordinates by the offset amounts specified in
drawing commands. According to the drawing commands, the G2D performs drawing operations
using these coordinates. Either 16 bits (16 bits/pixel) or 8 bits (8 bits/pixel) can be selected as the
data width of one rendering coordinate.
2-dimensional source coordinates are drawing control coordinates. When a drawing command is
executed with SS = 1, these are the source data (rectangle) coordinates specified by the drawing
command. Either 16 bits (16 bits/pixel) or 8 bits (8 bits/pixel) can be selected as the data width of
one 2-dimensional source coordinate.
1-dimensional source coordinates are drawing control coordinates. When a drawing command is
executed with SS = 0, these are the source data (1-dimensional) coordinates specified by the
drawing command. 1 bit (1 bit/pixel), 16 bits (16 bits/pixel), or 8 bits (8 bits/pixel) can be selected
as the data width of one 1-dimensional source coordinate. For one 1-dimensional source, one
physical address (top-left) and the horizontal width and vertical height of the 1-dimensional source
are specified.
Rev. 1.00 Nov. 22, 2007 Page 1078 of 1692
REJ09B0360-0100