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icon_painter.h: customizable pixel transfer

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This patch makes the application of color/alpha from the icon's texture
to the target surface customizable by replacing the formerly built-in
'_transfer_pixel' function by calls to the new 'Pixel_rgba::transfer'
interface.

Issue #3221
This commit is contained in:
Norman Feske 2019-03-09 17:31:31 +01:00 committed by Christian Helmuth
parent ebd9f36b0d
commit 116bfab449
1 changed files with 4 additions and 18 deletions
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22
repos/demo/include/scout_gfx/icon_painter.h
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@ -38,20 +38,6 @@ class Icon_painter
* vs ... vertical slice * vs ... vertical slice
*/ */
/**
* Copy pixel with alpha
*/
template <typename SPT, typename TPT>
static inline void _transfer_pixel(TPT const &src, int src_a, int alpha, SPT *dst)
{
if (src_a) {
int register a = (src_a * alpha)>>8;
if (a) *dst = SPT::mix(*dst, src, a);
}
}
/** /**
* Draw corner slice * Draw corner slice
*/ */
@ -67,7 +53,7 @@ class Icon_painter
SPT *d = dst; SPT *d = dst;
for (int i = 0; i < w; i++, s++, sa++, d++) for (int i = 0; i < w; i++, s++, sa++, d++)
_transfer_pixel(*s, *sa, alpha, d); SPT::transfer(*s, *sa, alpha, *d);
src += src_pitch, src_a += src_pitch, dst += dst_pitch; src += src_pitch, src_a += src_pitch, dst += dst_pitch;
} }
@ -89,7 +75,7 @@ class Icon_painter
SPT *d = dst; SPT *d = dst;
for (int i = 0; i < w; i++, d++) for (int i = 0; i < w; i++, d++)
_transfer_pixel(s, sa, alpha, d); SPT::transfer(s, sa, alpha, *d);
src += src_pitch, src_a += src_pitch, dst += dst_pitch; src += src_pitch, src_a += src_pitch, dst += dst_pitch;
} }
@ -111,7 +97,7 @@ class Icon_painter
SPT *d = dst; SPT *d = dst;
for (int j = 0; j < h; j++, d += dst_pitch) for (int j = 0; j < h; j++, d += dst_pitch)
_transfer_pixel(s, sa, alpha, d); SPT::transfer(s, sa, alpha, *d);
src += 1, src_a += 1, dst += 1; src += 1, src_a += 1, dst += 1;
} }
@ -134,7 +120,7 @@ class Icon_painter
SPT *d = dst; SPT *d = dst;
for (int i = 0; i < w; i++, d++) for (int i = 0; i < w; i++, d++)
_transfer_pixel(s, sa, alpha, d); SPT::transfer(s, sa, alpha, *d);
} }
} }