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sw_engine/texmap: tuning the blending logic

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Compromed the translucent/opaque logic by unifying them,
for code size and maintenance.
This commit is contained in:
Hermet Park 2025-01-18 14:54:03 +09:00 • committed by Hermet Park
parent abdb96b8a0
commit ef41f3f79c
1 changed files with 30 additions and 74 deletions
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48
src/renderer/sw_engine/tvgSwRasterTexmap.h
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@ -147,7 +147,6 @@ static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage
x = x1; x = x1;
if (opacity == 255) {
//Draw horizontal line //Draw horizontal line
while (x++ < x2) { while (x++ < x2) {
uu = (int) u; uu = (int) u;
@ -172,7 +171,6 @@ static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage
if (irv < sh) { if (irv < sh) {
/* bottom pixel */ /* bottom pixel */
int px2 = *(sbuf + (irv * image->stride) + uu); int px2 = *(sbuf + (irv * image->stride) + uu);
/* horizontal interpolate */ /* horizontal interpolate */
if (iru < sw) { if (iru < sw) {
/* bottom right pixel */ /* bottom right pixel */
@ -181,56 +179,14 @@ static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage
} }
px = INTERPOLATE(px, px2, ab); px = INTERPOLATE(px, px2, ab);
} }
*buf = surface->blender(px, *buf, IA(px)); auto tmp = surface->blender(px, *buf, 255);
*buf = INTERPOLATE(tmp, *buf, MULTIPLY(opacity, A(px)));
++buf; ++buf;
//Step UV horizontally //Step UV horizontally
u += _dudx; u += _dudx;
v += _dvdx; v += _dvdx;
} }
} else {
//Draw horizontal line
while (x++ < x2) {
uu = (int) u;
vv = (int) v;
if ((uint32_t) uu >= image->w || (uint32_t) vv >= image->h) continue;
ar = (int)(255 * (1 - modff(u, &iptr)));
ab = (int)(255 * (1 - modff(v, &iptr)));
iru = uu + 1;
irv = vv + 1;
px = *(sbuf + (vv * image->stride) + uu);
/* horizontal interpolate */
if (iru < sw) {
/* right pixel */
int px2 = *(sbuf + (vv * image->stride) + iru);
px = INTERPOLATE(px, px2, ar);
}
/* vertical interpolate */
if (irv < sh) {
/* bottom pixel */
int px2 = *(sbuf + (irv * image->stride) + uu);
/* horizontal interpolate */
if (iru < sw) {
/* bottom right pixel */
int px3 = *(sbuf + (irv * image->stride) + iru);
px2 = INTERPOLATE(px2, px3, ar);
}
px = INTERPOLATE(px, px2, ab);
}
auto src = ALPHA_BLEND(px, opacity);
*buf = surface->blender(src, *buf, IA(src));
++buf;
//Step UV horizontally
u += _dudx;
v += _dvdx;
}
}
} }
//Step along both edges //Step along both edges