Put duplicate code of a-comp and a-expander into one file ...

... for better maintainability

consolidated duplicate code:
  * drawing the dB-grid of a-comp's and a-expander's full display
  * drawing the gain reduction bar of a-comp's and a-expander's full display
  * the entire only-bars display

1 files changed, 205 insertions, 0 deletions

diff --git a/libs/plugins/shared/dynamic_display.c b/libs/plugins/shared/dynamic_display.c
new file mode 100644
index 0000000000..d274aa9d91
--- /dev/null
+++ b/libs/plugins/shared/dynamic_display.c
@@ -0,0 +1,205 @@
+/* dynamic_screen.c
+ * Copyright (C) 2018 Johannes Mueller <github@johannes-mueller.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.
+ */
+
+
+/* Shared code for a-comp.c and a-exp.c
+ *
+ * This file contains some code that draws the basic layout of for the inline
+ * rendering of a-comp.c and a-exp.c. It is put into a shared file for better
+ * maintainability. It is not meant to be compiled as a individual compilation
+ * unit but to be included like
+ *
+ * #include "dynamic_screen.c"
+ *
+ */
+
+
+static inline void
+draw_grid (cairo_t* cr, const float w, const float h)
+{
+	// clear background
+	cairo_rectangle (cr, 0, 0, w, h);
+	cairo_set_source_rgba (cr, .2, .2, .2, 1.0);
+	cairo_fill (cr);
+
+	cairo_set_line_width(cr, 1.0);
+
+	// draw grid 10dB steps
+	const double dash1[] = {1, 2};
+	const double dash2[] = {1, 3};
+	cairo_save (cr);
+	cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
+	cairo_set_dash(cr, dash2, 2, 2);
+	cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 0.5);
+
+	for (uint32_t d = 1; d < 7; ++d) {
+		const float x = -.5 + floorf (w * (d * 10.f / 70.f));
+		const float y = -.5 + floorf (h * (d * 10.f / 70.f));
+
+		cairo_move_to (cr, x, 0);
+		cairo_line_to (cr, x, h);
+		cairo_stroke (cr);
+
+		cairo_move_to (cr, 0, y);
+		cairo_line_to (cr, w, y);
+		cairo_stroke (cr);
+	}
+	cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 1.0);
+	cairo_set_dash(cr, dash1, 2, 2);
+
+	// diagonal unity
+	cairo_move_to (cr, 0, h);
+	cairo_line_to (cr, w, 0);
+	cairo_stroke (cr);
+	cairo_restore (cr);
+
+	{ // 0, 0
+		cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 0.5);
+		const float x = -.5 + floorf (w * (60.f / 70.f));
+		const float y = -.5 + floorf (h * (10.f / 70.f));
+		cairo_move_to (cr, x, 0);
+		cairo_line_to (cr, x, h);
+		cairo_stroke (cr);
+		cairo_move_to (cr, 0, y);
+		cairo_line_to (cr, w, y);
+		cairo_stroke (cr);
+	}
+}
+
+static inline void
+draw_GR_bar (cairo_t* cr, const float w, const float h, const float gainr)
+{
+	const float x = -.5 + floorf (w * (62.5f / 70.f));
+	const float y = -.5 + floorf (h * (10.0f / 70.f));
+	const float wd = floorf (w * (5.f / 70.f));
+	const float ht = floorf (h * (55.f / 70.f));
+	cairo_rectangle (cr, x, y, wd, ht);
+	cairo_fill (cr);
+
+	const float h_gr = fminf (ht, floorf (h * gainr / 70.f));
+	cairo_set_source_rgba (cr, 0.95, 0.0, 0.0, 1.0);
+	cairo_rectangle (cr, x, y, wd, h_gr);
+	cairo_fill (cr);
+	cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 0.5);
+	cairo_rectangle (cr, x, y, wd, ht);
+	cairo_set_source_rgba (cr, 0.75, 0.75, 0.75, 1.0);
+	cairo_stroke (cr);
+}
+
+static inline void
+draw_inline_bars (cairo_t* cr, const float w, const float h,
+		  const float thresdb, const float ratio,
+		  const float peakdb, const float gainr,
+		  const float level_in, const float level_out)
+{
+	cairo_rectangle (cr, 0, 0, w, h);
+	cairo_set_source_rgba (cr, .2, .2, .2, 1.0);
+	cairo_fill (cr);
+
+
+	cairo_save (cr);
+
+	const float ht = 0.25f * h;
+
+	const float x1 = w*0.05;
+	const float wd = w - 2.0f*x1;
+
+	const float y1 = 0.17*h;
+	const float y2 = h - y1 - ht;
+
+	cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 0.5);
+
+	cairo_rectangle (cr, x1, y1, wd, ht);
+	cairo_fill (cr);
+
+	cairo_rectangle (cr, x1, y2, wd, ht);
+	cairo_fill (cr);
+
+	cairo_set_source_rgba (cr, 0.75, 0.0, 0.0, 1.0);
+	const float w_gr = (gainr > 60.f) ? wd : wd * gainr * (1.f/60.f);
+	cairo_rectangle (cr, x1+wd-w_gr, y2, w_gr, ht);
+	cairo_fill (cr);
+
+	if (level_in > -60.f) {
+		if (level_out > 6.f) {
+			cairo_set_source_rgba (cr, 0.75, 0.0, 0.0, 1.0);
+		} else if (level_out > 0.f) {
+			cairo_set_source_rgba (cr, 0.66, 0.66, 0.0, 1.0);
+		} else {
+			cairo_set_source_rgba (cr, 0.0, 0.66, 0.0, 1.0);
+		}
+		const float w_g = (level_in > 10.f) ? wd : wd * (60.f+level_in) / 70.f;
+		cairo_rectangle (cr, x1, y1, w_g, ht);
+		cairo_fill (cr);
+	}
+
+	cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
+
+	const float tck = 0.33*ht;
+
+	cairo_set_line_width (cr, .5);
+
+	for (uint32_t d = 1; d < 7; ++d) {
+		const float x = x1 + (d * wd * (10.f / 70.f));
+
+		cairo_move_to (cr, x, y1);
+		cairo_line_to (cr, x, y1+tck);
+
+		cairo_move_to (cr, x, y1+ht);
+		cairo_line_to (cr, x, y1+ht-tck);
+
+		cairo_move_to (cr, x, y2);
+		cairo_line_to (cr, x, y2+tck);
+
+		cairo_move_to (cr, x, y2+ht);
+		cairo_line_to (cr, x, y2+ht-tck);
+	}
+
+	cairo_stroke (cr);
+
+	const float x_0dB = x1 + wd*(60.f/70.f);
+
+	cairo_move_to (cr, x_0dB, y1);
+	cairo_line_to (cr, x_0dB, y1+ht);
+
+	cairo_rectangle (cr, x1, y1, wd, ht);
+	cairo_rectangle (cr, x1, y2, wd, ht);
+	cairo_stroke (cr);
+
+	cairo_set_line_width (cr, 2.0);
+
+	// visualize threshold
+	const float tr = x1 + wd * (60.f+thresdb) / 70.f;
+	cairo_set_source_rgba (cr, 0.95, 0.95, 0.0, 1.0);
+	cairo_move_to (cr, tr, y1);
+	cairo_line_to (cr, tr, y1+ht);
+	cairo_stroke (cr);
+
+	// visualize ratio
+	const float reduced_0dB = thresdb * (1.f - 1.f/ratio);
+	const float rt = x1 + wd * (60.f+reduced_0dB) / 70.f;
+	cairo_set_source_rgba (cr, 0.95, 0.0, 0.0, 1.0);
+	cairo_move_to (cr, rt, y1);
+	cairo_line_to (cr, rt, y1+ht);
+	cairo_stroke (cr);
+
+	// visualize in peak
+	if (peakdb > -60.f) {
+		cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, 1.0);
+		const float pk = (peakdb > 10.f) ? x1+wd : wd * (60.f+peakdb) / 70.f;
+		cairo_move_to (cr, pk, y1);
+		cairo_line_to (cr, pk, y1+ht);
+		cairo_stroke (cr);
+	}
+}