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annotate infinite_canvas/theme.c @ 276:b55c22cff335

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Add interactive infinite canvas prototype
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 16:57:56 -0700
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children 8d560f50ed4c
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1 #include "infinite_canvas/theme.h"
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2
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3 #include <stdlib.h>
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4 #include <string.h>
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5
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6 #if defined(PLATFORM_WEB) || defined(__EMSCRIPTEN__)
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7 #include <emscripten/emscripten.h>
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8
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9 EM_JS(int, Canvas_Web_Prefers_Dark, (), {
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10 return window.matchMedia &&
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11 window.matchMedia("(prefers-color-scheme: dark)").matches ? 1 : 0;
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12 });
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13 #elif defined(_WIN32)
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14 #include <windows.h>
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15 #else
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16 #include <stdio.h>
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17 #endif
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18
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19 Canvas_Theme_Mode Canvas_Theme_Mode_From_String(const char *p_value)
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20 {
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21 if (!p_value || strcmp(p_value, "auto") == 0) return CANVAS_THEME_AUTO;
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22 if (strcmp(p_value, "light") == 0) return CANVAS_THEME_LIGHT;
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23 if (strcmp(p_value, "dark") == 0) return CANVAS_THEME_DARK;
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24 return CANVAS_THEME_AUTO;
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25 }
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26
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27 boolean Canvas_System_Prefers_Dark(void)
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28 {
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29 #if defined(PLATFORM_WEB) || defined(__EMSCRIPTEN__)
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30 return Canvas_Web_Prefers_Dark() ? TRUE : FALSE;
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31 #elif defined(_WIN32)
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32 DWORD light_theme = 1;
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33 DWORD size = sizeof(light_theme);
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34 LSTATUS status = RegGetValueA(
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35 HKEY_CURRENT_USER,
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36 "Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
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37 "AppsUseLightTheme",
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38 RRF_RT_REG_DWORD,
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39 NULL,
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40 &light_theme,
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41 &size);
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42 return status == ERROR_SUCCESS && light_theme == 0 ? TRUE : FALSE;
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43 #elif defined(__APPLE__)
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44 FILE *p_pipe = popen("defaults read -g AppleInterfaceStyle 2>/dev/null", "r");
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45 if (!p_pipe) return FALSE;
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46 char value[32] = {0};
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47 boolean dark = fgets(value, sizeof(value), p_pipe) &&
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48 strstr(value, "Dark") ? TRUE : FALSE;
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49 pclose(p_pipe);
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50 return dark;
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51 #else
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52 const char *p_gtk_theme = getenv("GTK_THEME");
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53 if (p_gtk_theme &&
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54 (strstr(p_gtk_theme, "dark") || strstr(p_gtk_theme, "Dark"))) {
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55 return TRUE;
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56 }
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57
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58 FILE *p_pipe = popen(
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59 "gsettings get org.gnome.desktop.interface color-scheme 2>/dev/null",
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60 "r");
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61 if (!p_pipe) return FALSE;
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62 char value[64] = {0};
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63 boolean dark = fgets(value, sizeof(value), p_pipe) &&
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64 strstr(value, "prefer-dark") ? TRUE : FALSE;
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65 pclose(p_pipe);
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66 return dark;
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67 #endif
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68 }
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69
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70 void Canvas_Theme_Resolve(Canvas_Theme *p_theme, Canvas_Theme_Mode mode)
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71 {
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72 Canvas_Theme_Mode resolved = mode;
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73 if (resolved == CANVAS_THEME_AUTO) {
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74 resolved = Canvas_System_Prefers_Dark() ?
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75 CANVAS_THEME_DARK :
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76 CANVAS_THEME_LIGHT;
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77 }
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78
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79 *p_theme = (Canvas_Theme){
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80 .requested_mode = mode,
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81 .resolved_mode = resolved,
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82 };
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83 if (resolved == CANVAS_THEME_DARK) {
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84 p_theme->background = (Color){15, 15, 17, 255};
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85 p_theme->surface = (Color){24, 24, 27, 255};
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86 p_theme->surface_muted = (Color){39, 39, 42, 255};
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87 p_theme->border = (Color){63, 63, 70, 255};
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88 p_theme->text = (Color){244, 244, 245, 255};
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89 p_theme->text_muted = (Color){161, 161, 170, 255};
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90 p_theme->accent = (Color){96, 165, 250, 255};
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91 p_theme->accent_soft = (Color){30, 58, 95, 255};
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92 p_theme->shadow = (Color){0, 0, 0, 110};
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93 p_theme->toast_surface = (Color){24, 24, 27, 255};
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94 p_theme->toast_border = (Color){63, 63, 70, 255};
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95 } else {
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96 p_theme->background = (Color){255, 255, 255, 255};
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97 p_theme->surface = (Color){255, 255, 255, 252};
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98 p_theme->surface_muted = (Color){244, 247, 251, 255};
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99 p_theme->border = (Color){205, 211, 221, 255};
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100 p_theme->text = (Color){24, 24, 27, 255};
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101 p_theme->text_muted = (Color){113, 113, 122, 255};
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102 p_theme->accent = (Color){37, 99, 235, 255};
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103 p_theme->accent_soft = (Color){239, 246, 255, 255};
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104 p_theme->shadow = (Color){15, 23, 42, 36};
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105 p_theme->toast_surface = (Color){255, 255, 255, 255};
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106 p_theme->toast_border = (Color){212, 216, 223, 255};
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107 }
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108 }
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109
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110 void Canvas_Theme_Toggle(Canvas_Theme *p_theme)
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111 {
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112 Canvas_Theme_Resolve(
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113 p_theme,
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114 p_theme->resolved_mode == CANVAS_THEME_DARK ?
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115 CANVAS_THEME_LIGHT :
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116 CANVAS_THEME_DARK);
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117 }
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118
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119 void Canvas_Theme_Draw_Shadow(
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120 const Canvas_Theme *p_theme,
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121 Rectangle bounds,
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122 float roundness,
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123 int32 segments,
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124 float zoom,
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125 float opacity)
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126 {
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127 float offset = 6.0f / zoom;
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128 float shadow_alpha = ((float)p_theme->shadow.a / 255.0f) * opacity;
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129 DrawRectangleRounded(
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130 (Rectangle){
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131 bounds.x + offset,
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132 bounds.y + offset,
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133 bounds.width,
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134 bounds.height,
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135 },
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136 roundness,
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137 segments,
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138 Fade(p_theme->shadow, shadow_alpha));
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139 }