+ /*
+ Cairo coordinate space goes downwards as y value goes up, so invert
+ knee-based positions by using (1.0 - y)
+ */
+
+ UINT_TO_RGBA (clr[9], &r, &g, &b, &a); // top/clip
+ cairo_pattern_add_color_stop_rgb (pat, 0.0,
+ r/255.0, g/255.0, b/255.0);
+
+ knee = offs + stp[3] / 115.0f; // -0dB
+
+ UINT_TO_RGBA (clr[8], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee,
+ r/255.0, g/255.0, b/255.0);
+
+ UINT_TO_RGBA (clr[7], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee + soft,
+ r/255.0, g/255.0, b/255.0);
+
+ knee = offs + stp[2]/ 115.0f; // -3dB || -2dB
+
+ UINT_TO_RGBA (clr[6], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee,
+ r/255.0, g/255.0, b/255.0);
+
+ UINT_TO_RGBA (clr[5], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee + soft,
+ r/255.0, g/255.0, b/255.0);
+
+ knee = offs + stp[1] / 115.0f; // -9dB
+
+ UINT_TO_RGBA (clr[4], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee,
+ r/255.0, g/255.0, b/255.0);
+
+ UINT_TO_RGBA (clr[3], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee + soft,
+ r/255.0, g/255.0, b/255.0);
+
+ knee = offs + stp[0] / 115.0f; // -18dB
+
+ UINT_TO_RGBA (clr[2], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee,
+ r/255.0, g/255.0, b/255.0);
+
+ UINT_TO_RGBA (clr[1], &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgb (pat, 1.0 - knee + soft,
+ r/255.0, g/255.0, b/255.0);
+
+ UINT_TO_RGBA (clr[0], &r, &g, &b, &a); // bottom
+ cairo_pattern_add_color_stop_rgb (pat, 1.0,
+ r/255.0, g/255.0, b/255.0);
+
+ if ((styleflags & 1) && !no_rgba_overlay) {
+ cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, width, 0.0);
+ cairo_pattern_add_color_stop_rgba (shade_pattern, 0, 0.0, 0.0, 0.0, 0.15);
+ cairo_pattern_add_color_stop_rgba (shade_pattern, 0.4, 1.0, 1.0, 1.0, 0.05);
+ cairo_pattern_add_color_stop_rgba (shade_pattern, 1, 0.0, 0.0, 0.0, 0.25);
+
+ cairo_surface_t* surface;
+ cairo_t* tc = 0;
+ surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
+ tc = cairo_create (surface);
+ cairo_set_source (tc, pat);
+ cairo_rectangle (tc, 0, 0, width, height);
+ cairo_fill (tc);
+ cairo_pattern_destroy (pat);
+
+ cairo_set_source (tc, shade_pattern);
+ cairo_rectangle (tc, 0, 0, width, height);
+ cairo_fill (tc);
+ cairo_pattern_destroy (shade_pattern);
+
+ if (styleflags & 2) { // LED stripes
+ cairo_save (tc);
+ cairo_set_line_width(tc, 1.0);
+ cairo_set_source_rgba(tc, .0, .0, .0, 0.4);
+ //cairo_set_operator (tc, CAIRO_OPERATOR_SOURCE);
+ for (int i = 0; float y = 0.5 + i * 2.0; ++i) {
+ if (y >= height) {
+ break;
+ }
+ cairo_move_to(tc, 0, y);
+ cairo_line_to(tc, width, y);
+ cairo_stroke (tc);
+ }
+ cairo_restore (tc);
+ }
+
+ pat = cairo_pattern_create_for_surface (surface);
+ cairo_destroy (tc);
+ cairo_surface_destroy (surface);