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cairowidget: add supplementary set_source_rgb_a() method that uses the uint32 Color type

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This commit is contained in:
Paul Davis 2022-08-10 18:15:25 -06:00
parent 5dbcd76cb1
commit e0d33bb726
2 changed files with 14 additions and 0 deletions
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12
libs/gtkmm2ext/cairo_widget.cc
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@ -42,6 +42,18 @@ void CairoWidget::set_source_rgb_a( cairo_t* cr, Gdk::Color col, float a) //ToD
cairo_set_source_rgba(cr, r, g, b, a);
}
void CairoWidget::set_source_rgb_a( cairo_t* cr, Gtkmm2ext::Color col, float a) //ToDo: this one and the Canvas version should be in a shared file (?)
{
int ir, ig, ib;
UINT_TO_RGB (col, &ir, &ig, &ib);
const float r = ir / 256.;
const float g = ig / 256.;
const float b = ib / 256.;
cairo_set_source_rgba(cr, r, g, b, a);
}
CairoWidget::CairoWidget ()
: _active_state (Gtkmm2ext::Off)
, _visual_state (Gtkmm2ext::NoVisualState)

2
libs/gtkmm2ext/gtkmm2ext/cairo_widget.h
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@ -28,6 +28,7 @@
#include "gtkmm2ext/visibility.h"
#include "gtkmm2ext/cairo_canvas.h"
#include "gtkmm2ext/cairo_theme.h"
#include "gtkmm2ext/colors.h"
#include "gtkmm2ext/widget_state.h"
/** A parent class for widgets that are rendered using Cairo.
@ -89,6 +90,7 @@ public:
static void set_source_rgb_a( cairo_t* cr, Gdk::Color, float a=1.0 );
static void set_source_rgb_a( cairo_t* cr, Gtkmm2ext::Color, float a=1.0 );
/* set_focus_handler() will cause all button-press events on any
CairoWidget to invoke this slot/functor/function/method/callback.