In the color calculation of the part with the original picture, the transparent code is valid when SPD = 0 and the end code is valid when ECD = 0, so no color calculation is performed for that pixel.
When performing color calculation other than shadow in RGB mode (color mode 5) and SPD = 1, the result of pixels with transparent color code (0000H) in the original picture is not guaranteed. Color calculation is performed assuming black.
* If color calculation other than shadow is performed in RGB mode (color mode 5) and ECD = 1, the pixel result of the original picture end code (7FFFH) is not guaranteed. Color calculation is performed assuming that it is white.
∙ Color operations other than shadows for polygons, polylines, and lines are valid only when the non-texture color is RGB code.
Figure 6.15 Color calculation example
