8.3.3.6
Bilinear filtering
The texture unit can be used to scale, rotate or shear images. The texturing result
can be filtered in x- and y-direction independently. When selecting both filters,
the result is a bilinear filtered texture. Using the unit two times with two
independent textures would generate trilinear filtered bitmaps, improving the
visual impression for high dynamic scale ratios.
8.3.3.7
Colour conversion
Colour conversion is necessary when using different texture formats than the
framebuffer format. For saving texture memory, several formats are supported
with less bpp than the framebuffer usually has.
The Drawing Engine internally always operates with 32 bpp aRGB(8888). For that
all input data are converted into 32 bpp and finally are converted back into the
framebuffer format. The Drawing Engine natively handles 8 bpp, 16 bpp and 32
bpp formats for textures and framebuffers.
Chapter 8
Drawing Engine
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