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fix ArdourFader to use contrasting_text_color() for text, based on relevant bg color

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This commit is contained in:
Paul Davis 2020-04-09 17:12:40 -06:00
parent 69b4c5108b
commit 5f1431aeda
1 changed files with 16 additions and 2 deletions
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18
libs/widgets/ardour_fader.cc
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@ -25,7 +25,9 @@
#include "pbd/stacktrace.h"
#include "gtkmm2ext/cairo_widget.h"
#include "gtkmm2ext/colors.h"
#include "gtkmm2ext/keyboard.h"
#include "gtkmm2ext/rgb_macros.h"
#include "gtkmm2ext/utils.h"
#include "widgets/ardour_fader.h"
@ -319,17 +321,29 @@ ArdourFader::render (Cairo::RefPtr<Cairo::Context> const& ctx, cairo_rectangle_t
}
if (_layout && !_text.empty() && _orien == HORIZ) {
Gdk::Color bg_color;
cairo_save (cr);
if (_centered_text) {
/* center text */
cairo_move_to (cr, (w - _text_width)/2.0, h/2.0 - _text_height/2.0);
bg_color = get_style()->get_bg (get_state());
} else if (ds > .5 * w) {
cairo_move_to (cr, CORNER_OFFSET + 3, h/2.0 - _text_height/2.0);
cairo_set_operator(cr, CAIRO_OPERATOR_XOR);
bg_color = get_style()->get_fg (get_state());
} else {
cairo_move_to (cr, w - _text_width - CORNER_OFFSET - 3, h/2.0 - _text_height/2.0);
bg_color = get_style()->get_bg (get_state());
}
CairoWidget::set_source_rgb_a (cr, get_style()->get_text (get_state()), 1);
const uint32_t r = bg_color.get_red_p () * 255.0;
const uint32_t g = bg_color.get_green_p () * 255.0;
const uint32_t b = bg_color.get_blue_p () * 255.0;
const uint32_t a = 0xff;
uint32_t rgba = RGBA_TO_UINT (r, g, b, a);
rgba = contrasting_text_color (rgba);
Gdk::Color text_color;
text_color.set_rgb ((rgba >> 24)*256, ((rgba & 0xff0000) >> 16)*256, ((rgba & 0xff00) >> 8)*256);
CairoWidget::set_source_rgb_a (cr, text_color, 1.);
pango_cairo_show_layout (cr, _layout->gobj());
cairo_restore (cr);
}