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[draw] Add alpha channel support

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Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
Julien Danjou 2008-05-30 13:00:52 +02:00
parent 066bfaacc8
commit 4f79c53f4c
2 changed files with 61 additions and 16 deletions
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8
awesomerc.5.txt
View file

@ -28,6 +28,14 @@ object with type "object_type".
include::apidocgen.txt[]
COLORS FORMAT
-------------
Colors format in *awesome* are either standard X color names
(blue, darkblue, lightred, etc) or hexadecimal formatted colors (#rrggbb).
By using hexadecimal format, you can also specifies an alpha channel:
that means that #00ff00 will draw pure green, but #00ff00aa will set the
alpha channel to `aa' and will blend the green with the color under it.
SEE ALSO
--------
awesome(1) awesome-client(1)

55
common/draw.c
View file

@ -348,10 +348,11 @@ draw_text(draw_context_t *ctx, font_t *font,
if(parser_data.shadow.offset)
{
cairo_set_source_rgb(ctx->cr,
cairo_set_source_rgba(ctx->cr,
parser_data.shadow.color.red / 65535.0,
parser_data.shadow.color.green / 65535.0,
parser_data.shadow.color.blue / 65535.0);
parser_data.shadow.color.blue / 65535.0,
parser_data.shadow.color.alpha / 65535.0);
cairo_move_to(ctx->cr, x + parser_data.shadow.offset, y + parser_data.shadow.offset);
pango_cairo_update_layout(ctx->cr, ctx->layout);
pango_cairo_show_layout(ctx->cr, ctx->layout);
@ -359,10 +360,11 @@ draw_text(draw_context_t *ctx, font_t *font,
cairo_move_to(ctx->cr, x, y);
cairo_set_source_rgb(ctx->cr,
cairo_set_source_rgba(ctx->cr,
fg->red / 65535.0,
fg->green / 65535.0,
fg->blue / 65535.0);
fg->blue / 65535.0,
fg->alpha / 65535.0);
pango_cairo_update_layout(ctx->cr, ctx->layout);
pango_cairo_show_layout(ctx->cr, ctx->layout);
@ -386,7 +388,11 @@ draw_setup_cairo_color_source(draw_context_t *ctx, area_t rect,
/* no need for a real pattern: */
if(!pcolor_end && !pcolor_center)
cairo_set_source_rgb(ctx->cr, pcolor->red / 65535.0, pcolor->green / 65535.0, pcolor->blue / 65535.0);
cairo_set_source_rgba(ctx->cr,
pcolor->red / 65535.0,
pcolor->green / 65535.0,
pcolor->blue / 65535.0,
pcolor->alpha / 65535.0);
else
{
pat = cairo_pattern_create_linear(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
@ -424,10 +430,11 @@ draw_rectangle(draw_context_t *ctx, area_t geometry, float line_width, bool fill
cairo_set_line_width(ctx->cr, line_width);
cairo_set_miter_limit(ctx->cr, 10.0);
cairo_set_line_join(ctx->cr, CAIRO_LINE_JOIN_MITER);
cairo_set_source_rgb(ctx->cr,
cairo_set_source_rgba(ctx->cr,
color.red / 65535.0,
color.green / 65535.0,
color.blue / 65535.0);
color.blue / 65535.0,
color.alpha / 65535.0);
if(filled)
{
cairo_rectangle(ctx->cr, geometry.x, geometry.y,
@ -647,7 +654,11 @@ void
draw_circle(draw_context_t *ctx, int x, int y, int r, bool filled, xcolor_t color)
{
cairo_set_line_width(ctx->cr, 1.0);
cairo_set_source_rgb(ctx->cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
cairo_set_source_rgba(ctx->cr,
color.red / 65535.0,
color.green / 65535.0,
color.blue / 65535.0,
color.alpha / 65535.0);
cairo_new_sub_path(ctx->cr); /* don't draw from the old reference point to.. */
@ -1017,15 +1028,40 @@ xcolor_new(xcb_connection_t *conn, int phys_screen, const char *colstr, xcolor_t
unsigned long colnum;
uint16_t red, green, blue;
ssize_t len;
char *buf;
if(!(len = a_strlen(colstr)))
return false;
/* The color is given in RGB value */
if(colstr[0] == '#' && len == 7)
if(colstr[0] == '#')
{
errno = 0;
if(len == 7)
{
colnum = strtoul(&colstr[1], NULL, 16);
color->alpha = 0xffff;
}
/* we have alpha */
else if(len == 9)
{
buf = a_strndup(colstr + 1, 6);
colnum = strtoul(buf, NULL, 16);
p_delete(&buf);
color->alpha = RGB_COLOR_8_TO_16(strtoul(&colstr[7], NULL, 16));
printf("%d alpha\n", color->alpha);
if(errno != 0)
{
warn("awesome: error, invalid color '%s'", colstr);
return false;
}
}
else
{
warn("awesome: error, invalid color '%s'", colstr);
return false;
}
if(errno != 0)
{
warn("awesome: error, invalid color '%s'", colstr);
@ -1068,6 +1104,7 @@ xcolor_new(xcb_connection_t *conn, int phys_screen, const char *colstr, xcolor_t
color->red = named_color->visual_red;
color->green = named_color->visual_green;
color->blue = named_color->visual_blue;
color->alpha = 0xffff;
p_delete(&named_color);
return true;