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draw: make draw_setup_cairo_color_source() alpha aware 

Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
Julien Danjou 2008-06-12 15:23:53 +02:00
parent 659f9bd048
commit 12d4c66771
1 changed files with 27 additions and 15 deletions
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42
common/draw.c
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@ -374,13 +374,13 @@ draw_text(draw_context_t *ctx, font_t *font,
p_delete(&buf);
}
/** Setup color-source for cairo (gradient or mono)
* \param ctx Draw context
* \param rect x,y to x+x_offset,y+y_offset
* \param color color to use at start (x,y)
* \param pcolor_center color at 50% of width
* \param pcolor_end color at pattern end (x + x_offset, y + y_offset)
* \return pat pattern or NULL; needs to get cairo_pattern_destroy()'ed;
/** Setup color-source for cairo (gradient or mono).
* \param ctx Draw context.
* \param rect x, y to x + x_offset, y + y_offset.
* \param color Color to use at start (x, y).
* \param pcolor_center Color at 50% of width.
* \param pcolor_end Color at pattern end (x + x_offset, y + y_offset).
* \return pat Pattern or NULL, needs to get cairo_pattern_destroy()'ed.
*/
static cairo_pattern_t *
draw_setup_cairo_color_source(draw_context_t *ctx, area_t rect,
@ -401,19 +401,31 @@ draw_setup_cairo_color_source(draw_context_t *ctx, area_t rect,
pat = cairo_pattern_create_linear(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
/* pcolor is always set (so far in awesome) */
cairo_pattern_add_color_stop_rgb(pat, 0.0, pcolor->red / 65535.0,
pcolor->green / 65535.0, pcolor->blue / 65535.0);
cairo_pattern_add_color_stop_rgba(pat, 0.0,
pcolor->red / 65535.0,
pcolor->green / 65535.0,
pcolor->blue / 65535.0,
pcolor->alpha / 65535.0);
if(pcolor_center)
cairo_pattern_add_color_stop_rgb(pat, 0.5, pcolor_center->red / 65535.0,
pcolor_center->green / 65535.0, pcolor_center->blue / 65535.0);
cairo_pattern_add_color_stop_rgba(pat, 0.5,
pcolor_center->red / 65535.0,
pcolor_center->green / 65535.0,
pcolor_center->blue / 65535.0,
pcolor_center->alpha / 65535.0);
if(pcolor_end)
cairo_pattern_add_color_stop_rgb(pat, 1.0, pcolor_end->red / 65535.0,
pcolor_end->green / 65535.0, pcolor_end->blue / 65535.0);
cairo_pattern_add_color_stop_rgba(pat, 1.0,
pcolor_end->red / 65535.0,
pcolor_end->green / 65535.0,
pcolor_end->blue / 65535.0,
pcolor_end->alpha / 65535.0);
else
cairo_pattern_add_color_stop_rgb(pat, 1.0, pcolor->red / 65535.0,
pcolor->green / 65535.0, pcolor->blue / 65535.0);
cairo_pattern_add_color_stop_rgba(pat, 1.0,
pcolor->red / 65535.0,
pcolor->green / 65535.0,
pcolor->blue / 65535.0,
pcolor->alpha / 65535.0);
cairo_set_source(ctx->cr, pat);
}
return pat;