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Fix premultiplying on rounded rectangles

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This commit is contained in:
K. Lange 2018-07-21 23:00:26 +09:00
parent f77064f364
commit 5ae01e206d
1 changed files with 3 additions and 2 deletions
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5
lib/graphics.c
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@ -743,13 +743,14 @@ void draw_rounded_rectangle(gfx_context_t * ctx, int32_t x, int32_t y, uint16_t
radius = height / 2;
}
uint32_t c = premultiply(color);
for (int row = y; row < y + height; row++){
for (int col = x; col < x + width; col++) {
if ((col < x + radius || col > x + width - radius - 1) &&
(row < y + radius || row > y + height - radius - 1)) {
continue;
}
GFX(ctx, col, row) = alpha_blend_rgba(GFX(ctx, col, row), color);
GFX(ctx, col, row) = alpha_blend_rgba(GFX(ctx, col, row), c);
}
}
@ -767,7 +768,7 @@ void draw_rounded_rectangle(gfx_context_t * ctx, int32_t x, int32_t y, uint16_t
uint32_t c = color;
if (j == (int)j_max) {
c = rgba(_RED(c),_BLU(c),_GRE(c),(int)((double)_ALP(c) * (j_max - (double)j)));
c = premultiply(rgba(_RED(c),_BLU(c),_GRE(c),(int)((double)_ALP(c) * (j_max - (double)j))));
}
GFX(ctx, _x, _y) = alpha_blend_rgba(GFX(ctx, _x, _y), c);