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These are plug-in fallbacks for the pipe->surface_copy() and
pipe->surface_fill() functions.
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We want to use the pipe_buffer_* inlines everywhere, but a pipe context
is not always available nor is it needed.
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Also, rename p_tile.[ch] to u_tile.[ch]
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More can be done...
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So far, optimized/low-precision versions of exp(), exp2(), log2(), pow().
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We need to compute the default dst_stride and src_stride _before_ clipping.
After clipping, the width value may have changed.
This fixes visible tile glitches in some demos like progs/glsl/texdemo.c
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of a trace.
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yuv surfaces.
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You don't need a pipe_context * for this, and all other necessary info is
already inside pipe_surface.
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The chars-per-pixel concept falls apart with compressed and yuv images,
where more than one pixel are coded in a single data block.
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ad-hoc ones.
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