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Correctly premultiply background color of fringe bitmaps

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* src/xterm.c (x_draw_fringe_bitmap): Premultiply alphas by
alpha_background.
This commit is contained in:
Po Lu 2022-02-10 19:56:30 +08:00
parent e16a78c44e
commit d49c8cea43
1 changed files with 12 additions and 2 deletions
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14
src/xterm.c
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@ -2111,6 +2111,7 @@ x_draw_fringe_bitmap (struct window *w, struct glyph_row *row, struct draw_fring
int depth = FRAME_DISPLAY_INFO (f)->n_planes;
XGCValues gcv;
unsigned long background = face->background;
XColor bg;
#ifdef HAVE_XRENDER
Picture picture = None;
XRenderPictureAttributes attrs;
@ -2123,9 +2124,18 @@ x_draw_fringe_bitmap (struct window *w, struct glyph_row *row, struct draw_fring
else
bits = (char *) p->bits + p->dh;
if (FRAME_DISPLAY_INFO (f)->alpha_bits)
if (FRAME_DISPLAY_INFO (f)->alpha_bits
&& f->alpha_background < 1.0)
{
background = (background & ~FRAME_DISPLAY_INFO (f)->alpha_mask);
bg.pixel = background;
x_query_colors (f, &bg, 1);
bg.red *= f->alpha_background;
bg.green *= f->alpha_background;
bg.blue *= f->alpha_background;
background = x_make_truecolor_pixel (FRAME_DISPLAY_INFO (f),
bg.red, bg.green, bg.blue);
background &= ~FRAME_DISPLAY_INFO (f)->alpha_mask;
background |= (((unsigned long) (f->alpha_background * 0xffff)
>> (16 - FRAME_DISPLAY_INFO (f)->alpha_bits))
<< FRAME_DISPLAY_INFO (f)->alpha_offset);