migrate ArdourButton Icon rendering to Gtkmm2ext.

part one: add new API

1 files changed, 428 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/ardour_icon.cc b/libs/gtkmm2ext/ardour_icon.cc
new file mode 100644
index 0000000000..36b0b3c387
--- /dev/null
+++ b/libs/gtkmm2ext/ardour_icon.cc
@@ -0,0 +1,428 @@
+/*
+    Copyright (C) 2009 Paul Davis
+    Copyright (C) 2015 Robin Gareus <robin@gareus.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+*/
+
+#include <math.h> // For M_PI
+#include <algorithm>
+#include "gtkmm2ext/ardour_icon.h"
+
+// "canvas/types.h" Color == uint32_t
+// from libs/canvas/utils.cc
+static void ardour_canvas_set_source_rgba (cairo_t *cr, uint32_t color)
+{
+	cairo_set_source_rgba ( cr,
+			((color >> 24) & 0xff) / 255.0,
+			((color >> 16) & 0xff) / 255.0,
+			((color >>  8) & 0xff) / 255.0,
+			((color >>  0) & 0xff) / 255.0
+			);
+}
+
+bool
+Gtkmm2ext::ArdourIcon::render (cairo_t *cr,
+                               const enum Gtkmm2ext::ArdourIcon::Icon icon,
+                               const int width, const int height,
+                               const Gtkmm2ext::ActiveState state,
+                               const uint32_t fg_color)
+{
+
+#define VECTORICONSTROKEFILL(fillalpha) \
+	cairo_set_line_width(cr, 1.5); \
+	cairo_set_source_rgba (cr, 0, 0, 0, 1.0); \
+	cairo_stroke_preserve(cr); \
+	cairo_set_source_rgba (cr, 1, 1, 1, (fillalpha)); \
+	cairo_fill(cr);
+
+#define VECTORICONSTROKEOUTLINE() \
+	cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); \
+	cairo_set_line_width(cr, 3.0); \
+	cairo_set_source_rgba (cr, 0, 0, 0, 1.0); \
+	cairo_stroke_preserve(cr); \
+	ardour_canvas_set_source_rgba (cr, fg_color); \
+	cairo_set_line_width(cr, 1.5);  \
+	cairo_stroke(cr);
+
+
+	/* TODO separate these into dedicated class
+	 * it may also be efficient to render them only once for every size (image-surface) */
+	switch (icon) {
+
+	case Gtkmm2ext::ArdourIcon::RecTapeMode:
+	{
+		const double x = width * .5;
+		const double y = height * .5;
+		const double r = std::min(x, y) * .6;
+		const double slit = .11 * M_PI;
+		cairo_save(cr);
+		cairo_translate(cr, x, y);
+
+		cairo_arc (cr, 0, 0, r, 0, 2 * M_PI);
+		if (state == Gtkmm2ext::ExplicitActive) {
+			cairo_set_source_rgba (cr, .95, .1, .1, 1.);
+		} else {
+			cairo_set_source_rgba (cr, .95, .44, .44, 1.); // #f46f6f
+		}
+		cairo_fill_preserve(cr);
+		cairo_set_source_rgba (cr, .0, .0, .0, .5);
+		cairo_set_line_width(cr, 1);
+		cairo_stroke(cr);
+
+		cairo_save(cr);
+		cairo_set_source_rgba (cr, .15, .07, .07, 1.0);
+
+		cairo_rotate (cr, -.5 * M_PI);
+		cairo_move_to(cr, 0, 0);
+		cairo_arc (cr, 0, 0, r *.85, -slit, slit);
+		cairo_line_to(cr, 0, 0);
+		cairo_close_path(cr);
+
+		cairo_fill(cr);
+		cairo_rotate (cr, 2. * M_PI / 3.);
+
+		cairo_move_to(cr, 0, 0);
+		cairo_arc (cr, 0, 0, r *.85, -slit, slit);
+		cairo_line_to(cr, 0, 0);
+		cairo_close_path(cr);
+		cairo_fill(cr);
+
+		cairo_rotate (cr, 2. * M_PI / 3.);
+		cairo_move_to(cr, 0, 0);
+		cairo_arc (cr, 0, 0, r *.85, -slit, slit);
+		cairo_line_to(cr, 0, 0);
+		cairo_close_path(cr);
+		cairo_fill(cr);
+
+		cairo_restore(cr);
+
+		cairo_arc (cr, 0, 0, r * .3, 0, 2 * M_PI);
+		if (state == Gtkmm2ext::ExplicitActive)
+			cairo_set_source_rgba (cr, .95, .1, .1, 1.);
+		else
+			cairo_set_source_rgba (cr, .95, .44, .44, 1.); // #f46f6f
+		cairo_fill(cr);
+		cairo_set_source_rgba (cr, .0, .0, .0, 1.0);
+		cairo_arc (cr, 0, 0, r *.15, 0, 2 * M_PI); // hole in the middle
+		cairo_fill(cr);
+
+		cairo_restore(cr);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::RecButton:
+	{
+		const double x = width * .5;
+		const double y = height * .5;
+		const double r = std::min(x, y) * .55;
+		cairo_arc (cr, x, y, r, 0, 2 * M_PI);
+		if (state == Gtkmm2ext::ExplicitActive)
+			cairo_set_source_rgba (cr, .95, .1, .1, 1.);
+		else
+			cairo_set_source_rgba (cr, .95, .44, .44, 1.); // #f46f6f
+		cairo_fill_preserve(cr);
+		cairo_set_source_rgba (cr, .0, .0, .0, .8);
+		cairo_set_line_width(cr, 1);
+		cairo_stroke(cr);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::CloseCross:
+	{
+		const double x = width * .5;
+		const double y = height * .5;
+		const double o = .5 + std::min(x, y) * .4;
+		ardour_canvas_set_source_rgba (cr, fg_color);
+		cairo_set_line_width(cr, 1);
+		cairo_move_to(cr, x-o, y-o);
+		cairo_line_to(cr, x+o, y+o);
+		cairo_move_to(cr, x+o, y-o);
+		cairo_line_to(cr, x-o, y+o);
+		cairo_stroke(cr);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::StripWidth:
+	{
+		const double x0 = width  * .2;
+		const double x1 = width  * .8;
+
+		const double y0 = height * .25;
+		const double y1= height  * .75;
+
+		const double ym= height  * .5;
+
+		// arrow
+		const double xa0= height  * .39;
+		const double xa1= height  * .61;
+		const double ya0= height  * .35;
+		const double ya1= height  * .65;
+
+		ardour_canvas_set_source_rgba (cr, fg_color);
+		cairo_set_line_width(cr, 1);
+
+		// left + right
+		cairo_move_to(cr, x0, y0);
+		cairo_line_to(cr, x0, y1);
+		cairo_move_to(cr, x1, y0);
+		cairo_line_to(cr, x1, y1);
+
+		// horiz center line
+		cairo_move_to(cr, x0, ym);
+		cairo_line_to(cr, x1, ym);
+
+		// arrow left
+		cairo_move_to(cr,  x0, ym);
+		cairo_line_to(cr, xa0, ya0);
+		cairo_move_to(cr,  x0, ym);
+		cairo_line_to(cr, xa0, ya1);
+
+		// arrow right
+		cairo_move_to(cr,  x1,  ym);
+		cairo_line_to(cr, xa1, ya0);
+		cairo_move_to(cr,  x1,  ym);
+		cairo_line_to(cr, xa1, ya1);
+		cairo_stroke(cr);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::DinMidi:
+	{
+		const double x = width * .5;
+		const double y = height * .5;
+		const double r = std::min(x, y) * .75;
+		ardour_canvas_set_source_rgba (cr, fg_color);
+		cairo_set_line_width(cr, 1);
+		cairo_arc (cr, x, y, r, .57 * M_PI, 2.43 * M_PI);
+		cairo_stroke(cr);
+
+		// pins equally spaced 45deg
+		cairo_arc (cr, x, y * 0.5, r * .15, 0, 2 * M_PI);
+		cairo_fill(cr);
+		cairo_arc (cr, x * 0.5, y, r * .15, 0, 2 * M_PI);
+		cairo_fill(cr);
+		cairo_arc (cr, x * 1.5, y, r * .15, 0, 2 * M_PI);
+		cairo_fill(cr);
+		//  .5 + .5 * .5 * sin(45deg),  1.5 - .5 * .5 * cos(45deg)
+		cairo_arc (cr, x * 0.677, y * .677, r * .15, 0, 2 * M_PI);
+		cairo_fill(cr);
+		cairo_arc (cr, x * 1.323, y * .677, r * .15, 0, 2 * M_PI);
+		cairo_fill(cr);
+
+		// bottom notch
+		cairo_arc (cr, x, y+r, r * .26, 1.05 * M_PI, 1.95 * M_PI);
+		cairo_stroke(cr);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::TransportStop:
+	{
+		const int wh = std::min (width, height);
+		cairo_rectangle (cr,
+				(width - wh) * .5 + wh * .25,
+				(height - wh) * .5 + wh * .25,
+				wh * .5, wh * .5);
+
+		VECTORICONSTROKEFILL(0.8);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::TransportPlay:
+	{
+		const int wh = std::min (width, height) * .5;
+		const double y = height * .5;
+		const double x = width - wh;
+
+		const float tri = ceil(.577 * wh); // 1/sqrt(3)
+
+		cairo_move_to (cr,  x + wh * .5, y);
+		cairo_line_to (cr,  x - wh * .5, y - tri);
+		cairo_line_to (cr,  x - wh * .5, y + tri);
+		cairo_close_path (cr);
+
+		VECTORICONSTROKEFILL(0.8);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::TransportPanic:
+	{
+		const int wh = std::min (width, height) * .1;
+		const double xc = width * .5;
+		const double yh = height;
+		cairo_rectangle (cr,
+				xc - wh, yh *.19,
+				wh * 2,  yh *.41);
+		VECTORICONSTROKEFILL(0.8);
+
+		cairo_arc (cr, xc, yh *.75, wh, 0, 2 * M_PI);
+		VECTORICONSTROKEFILL(0.8);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::TransportStart:
+	case Gtkmm2ext::ArdourIcon::TransportEnd:
+	case Gtkmm2ext::ArdourIcon::TransportRange:
+	{
+		// small play triangle
+		int wh = std::min (width, height);
+		const double y = height * .5;
+		const double x = width - wh * .5;
+		wh *= .18;
+		const float tri = ceil(.577 * wh * 2); // 1/sqrt(3)
+
+		const float ln = std::min (width, height) * .07;
+
+		if (icon == Gtkmm2ext::ArdourIcon::TransportStart || icon == Gtkmm2ext::ArdourIcon::TransportRange) {
+			cairo_rectangle (cr,
+					x - wh - ln, y  - tri * 1.7,
+					ln * 2,  tri * 3.4);
+
+			VECTORICONSTROKEFILL(1.0);
+		}
+
+		if (icon == Gtkmm2ext::ArdourIcon::TransportEnd || icon == Gtkmm2ext::ArdourIcon::TransportRange) {
+			cairo_rectangle (cr,
+					x + wh - ln, y  - tri * 1.7,
+					ln * 2,  tri * 3.4);
+
+			VECTORICONSTROKEFILL(1.0);
+		}
+
+		if (icon == Gtkmm2ext::ArdourIcon::TransportStart) {
+			cairo_move_to (cr,  x - wh, y);
+			cairo_line_to (cr,  x + wh, y - tri);
+			cairo_line_to (cr,  x + wh, y + tri);
+		} else {
+			cairo_move_to (cr,  x + wh, y);
+			cairo_line_to (cr,  x - wh, y - tri);
+			cairo_line_to (cr,  x - wh, y + tri);
+		}
+
+		cairo_close_path (cr);
+		VECTORICONSTROKEFILL(1.0);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::TransportLoop:
+	{
+		const double x = width * .5;
+		const double y = height * .5;
+		const double r = std::min(x, y);
+
+		cairo_arc          (cr, x, y, r * .62, 0, 2 * M_PI);
+		cairo_arc_negative (cr, x, y, r * .35, 2 * M_PI, 0);
+
+		VECTORICONSTROKEFILL(1.0);
+#define ARCARROW(rad, ang) \
+		x + (rad) * sin((ang) * 2.0 * M_PI), y + (rad) * cos((ang) * 2.0 * M_PI)
+
+		cairo_move_to (cr, ARCARROW(r * .35, .72));
+		cairo_line_to (cr, ARCARROW(r * .15, .72));
+		cairo_line_to (cr, ARCARROW(r * .56, .60));
+		cairo_line_to (cr, ARCARROW(r * .75, .72));
+		cairo_line_to (cr, ARCARROW(r * .62, .72));
+
+		cairo_set_source_rgba (cr, 0, 0, 0, 1.0);
+		cairo_stroke_preserve(cr);
+		cairo_close_path (cr);
+		cairo_set_source_rgba (cr, 1, 1, 1, 1.0);
+		cairo_fill(cr);
+#undef ARCARROW
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::TransportMetronom:
+	{
+		const double x  = width * .5;
+		const double y  = height * .5;
+		const double wh = std::min(x, y);
+		const double h  = wh * .85;
+		const double w  = wh * .55;
+		const double lw = w  * .34;
+
+		cairo_rectangle (cr,
+				x - w * .7, y + h * .25,
+				w * 1.4, lw);
+
+		VECTORICONSTROKEFILL(1.0);
+
+		cairo_move_to (cr,  x - w,       y + h);
+		cairo_line_to (cr,  x + w,       y + h);
+		cairo_line_to (cr,  x + w * .35, y - h);
+		cairo_line_to (cr,  x - w * .35, y - h);
+		cairo_line_to (cr,  x - w,       y + h);
+
+		cairo_move_to (cr,  x - w + lw,       y + h -lw);
+		cairo_line_to (cr,  x - w * .35 + lw, y - h + lw);
+		cairo_line_to (cr,  x + w * .35 - lw, y - h + lw);
+		cairo_line_to (cr,  x + w - lw,       y + h -lw);
+		cairo_line_to (cr,  x - w + lw,       y + h -lw);
+
+		VECTORICONSTROKEFILL(1.0);
+
+		// ddx = .70 w      = .75 * .5 wh              = .375 wh
+		// ddy = .75 h - lw = .75 * .8 wh - wh .5 * .2 = .5 wh
+		// ang = (ddx/ddy):
+		// -> angle = atan (ang) = atan (375 / .5) ~= 36deg
+		const double dx = lw * .2;  // 1 - cos(tan^-1(ang))
+		const double dy = lw * .4;  // 1 - sin(tan^-1(ang))
+		cairo_move_to (cr,  x - w * .3     , y + h * .25 + lw * .5);
+		cairo_line_to (cr,  x - w + dx     , y - h + lw + dy);
+		cairo_line_to (cr,  x - w + lw     , y - h + lw);
+		cairo_line_to (cr,  x - w * .3 + lw, y + h * .25 + lw * .5);
+		cairo_close_path (cr);
+
+		VECTORICONSTROKEFILL(1.0);
+
+		cairo_rectangle (cr,
+				x - w * .7, y + h * .25,
+				w * 1.4, lw);
+		cairo_fill(cr);
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::NudgeLeft:
+	{
+		const double x = width * .5;
+		const double y = height * .5;
+		const double wh = std::min (x, y);
+
+		const double tri_x = .3 * wh;
+		const double tri_y = .6 * wh;
+
+		cairo_move_to (cr, x + tri_x, y - tri_y);
+		cairo_line_to (cr, x - tri_x, y);
+		cairo_line_to (cr, x + tri_x, y + tri_y);
+		VECTORICONSTROKEOUTLINE();
+	}
+	break;
+	case Gtkmm2ext::ArdourIcon::NudgeRight:
+	{
+
+		const double x = width * .5;
+		const double y = height * .5;
+		const double wh = std::min (x, y);
+
+		const double tri_x = .3 * wh;
+		const double tri_y = .6 * wh;
+
+		cairo_move_to (cr, x - tri_x, y - tri_y);
+		cairo_line_to (cr, x + tri_x, y);
+		cairo_line_to (cr, x - tri_x, y + tri_y);
+		VECTORICONSTROKEOUTLINE();
+
+	}
+	break;
+	default:
+		return false;
+	} // end case(icon)
+
+#undef VECTORICONSTROKEFILL
+#undef VECTORICONSTROKEOUTLINE
+	return true;
+}
+
+