comparison: pidgin/pidginstylecontext.c
pidgin/pidginstylecontext.c
- changeset 40713
- 766bbe6061ec
- parent 40695
- df2674f2d982
- child 40724
- b317bb7479e5
equal
deleted
inserted
replaced
| 40712:c6789ca79811 | 40713:766bbe6061ec |
|---|---|
| 27 static gboolean dark_mode_cached_value = FALSE; | 27 static gboolean dark_mode_cached_value = FALSE; |
| 28 | 28 |
| 29 /****************************************************************************** | 29 /****************************************************************************** |
| 30 * Public API | 30 * Public API |
| 31 *****************************************************************************/ | 31 *****************************************************************************/ |
| 32 void | |
| 33 pidgin_style_context_get_background_color(GdkRGBA *color) { | |
| 34 /* This value will leak, we could put a shutdown function in but right now | |
| 35 * that seems like a bit much for a few bytes. | |
| 36 */ | |
| 37 static GdkRGBA *background = NULL; | |
| 38 | |
| 39 if(g_once_init_enter(&background)) { | |
| 40 GdkRGBA *bg = NULL; | |
| 41 GtkStyleContext *context = NULL; | |
| 42 GtkWidget *window = NULL; | |
| 43 | |
| 44 /* We create a window to get its background color from its style | |
| 45 * context. This _is_ doable without creating a window, but you still | |
| 46 * need the window class and about four times as much code, so that's | |
| 47 * why we do it this way. | |
| 48 */ | |
| 49 window = gtk_window_new(GTK_WINDOW_TOPLEVEL); | |
| 50 context = gtk_widget_get_style_context(window); | |
| 51 | |
| 52 gtk_style_context_get(context, GTK_STATE_FLAG_NORMAL, | |
| 53 GTK_STYLE_PROPERTY_BACKGROUND_COLOR, &bg, | |
| 54 NULL); | |
| 55 g_object_unref(G_OBJECT(window)); | |
| 56 | |
| 57 g_once_init_leave(&background, bg); | |
| 58 } | |
| 59 | |
| 60 *color = *background; | |
| 61 } | |
| 62 | |
| 32 gboolean | 63 gboolean |
| 33 pidgin_style_context_is_dark(GtkStyleContext *context) { | 64 pidgin_style_context_is_dark(void) { |
| 34 GdkRGBA bg; | 65 GdkRGBA bg; |
| 35 gdouble luminance = 0.0; | 66 gdouble luminance = 0.0; |
| 36 | 67 |
| 37 if(context == NULL) { | 68 if(dark_mode_have_cache) { |
| 38 if(dark_mode_have_cache) { | 69 return dark_mode_cached_value; |
| 39 return dark_mode_cached_value; | |
| 40 } | |
| 41 | |
| 42 context = gtk_style_context_new(); | |
| 43 } else { | |
| 44 g_object_ref(G_OBJECT(context)); | |
| 45 } | 70 } |
| 46 | 71 |
| 47 gtk_style_context_get(context, GTK_STATE_FLAG_NORMAL, | 72 pidgin_style_context_get_background_color(&bg); |
| 48 GTK_STYLE_PROPERTY_BACKGROUND_COLOR, &bg, | |
| 49 NULL); | |
| 50 g_object_unref(G_OBJECT(context)); | |
| 51 | 73 |
| 52 /* magic values are taken from https://en.wikipedia.org/wiki/Luma_(video) | 74 /* 709 coefficients from https://en.wikipedia.org/wiki/Luma_(video) */ |
| 53 * Rec._601_luma_versus_Rec._709_luma_coefficients. | 75 luminance = (0.2126 * bg.red) + (0.7152 * bg.green) + (0.0722 * bg.blue); |
| 54 */ | |
| 55 luminance = (0.299 * bg.red) + (0.587 * bg.green) + (0.114 * bg.blue); | |
| 56 | 76 |
| 57 dark_mode_cached_value = (luminance < 0x7FFF); | 77 dark_mode_cached_value = (luminance < 0.5); |
| 58 dark_mode_have_cache = TRUE; | 78 dark_mode_have_cache = TRUE; |
| 59 | 79 |
| 60 return dark_mode_cached_value; | 80 return dark_mode_cached_value; |
| 61 } | 81 } |
| 62 | |
| 63 void | |
| 64 pidgin_style_context_adjust_contrast(GtkStyleContext *context, GdkRGBA *rgba) { | |
| 65 if(pidgin_style_context_is_dark(context)) { | |
| 66 gdouble h, s, v; | |
| 67 | |
| 68 gtk_rgb_to_hsv(rgba->red, rgba->green, rgba->blue, &h, &s, &v); | |
| 69 | |
| 70 v += 0.3; | |
| 71 v = v > 1.0 ? 1.0 : v; | |
| 72 s = 0.7; | |
| 73 | |
| 74 gtk_hsv_to_rgb(h, s, v, &rgba->red, &rgba->green, &rgba->blue); | |
| 75 } | |
| 76 } |
