Move colors and their handling in own translation unit and refactor them slightly

.gitignore

@@ -10,6 +10,7 @@
 /build-aux/
 /config.*
 /configure
+/doc/html/
 /libtool
 /po/POTFILES
 Makefile

callbacks.c

@@ -28,57 +28,20 @@
 #include "callbacks.h"
 #include "gettext.h"
 #include "main.h"
+#include "screentest_colors.h"
 #define _(String) gettext(String)
 
-GdkRGBA fgcolors[COLOR_MAX];
-GdkRGBA *fg_color, *bg_color;
-GdkRGBA grays[GRAYS_MAX];
-int fg_count = COLOR_WHITE;
+int fg_count = SCREENTEST_COLORS_WHITE;
 
 static GtkWidget *mainwin = NULL;
 static struct test_ops *current_test = &basic_ops;
 
 G_MODULE_EXPORT void on_mainwin_realize(GtkWidget *widget,
                                         G_GNUC_UNUSED gpointer user_data) {
-  gint i;
-
 #ifndef DEBUG
   gtk_window_fullscreen(GTK_WINDOW(widget));
 #endif
 
-  memset(fgcolors, 0, COLOR_MAX * sizeof(GdkRGBA));
-
-  fgcolors[COLOR_WHITE].red = fgcolors[COLOR_WHITE].green =
-      fgcolors[COLOR_WHITE].blue = fgcolors[COLOR_WHITE].alpha = 1.0;
-
-  fgcolors[COLOR_RED].red = fgcolors[COLOR_RED].alpha = 1.0;
-
-  fgcolors[COLOR_GREEN].green = fgcolors[COLOR_GREEN].alpha = 1.0;
-
-  fgcolors[COLOR_BLUE].blue = fgcolors[COLOR_BLUE].alpha = 1.0;
-
-  fgcolors[COLOR_CYAN].green = 1.0;
-  fgcolors[COLOR_CYAN].blue = 1.0;
-  fgcolors[COLOR_CYAN].alpha = 1.0;
-
-  fgcolors[COLOR_MAGENTA].red = 1.0;
-  fgcolors[COLOR_MAGENTA].blue = 1.0;
-  fgcolors[COLOR_MAGENTA].alpha = 1.0;
-
-  fgcolors[COLOR_YELLOW].red = 1.0;
-  fgcolors[COLOR_YELLOW].green = 1.0;
-  fgcolors[COLOR_YELLOW].alpha = 1.0;
-
-  fgcolors[COLOR_BLACK].alpha = 1.0; // The other fields are 0 already
-
-  fg_color = gdk_rgba_copy(&fgcolors[COLOR_WHITE]);
-  bg_color = gdk_rgba_copy(&fgcolors[COLOR_BLACK]);
-
-  for (i = 0; i < GRAYS_MAX; i++) {
-    grays[i].red = grays[i].green = grays[i].blue = i / (float)(GRAYS_MAX - 1);
-    grays[i].alpha = 1.0;
-  }
-
   mainwin = widget;
 
   if (current_test->init != NULL)
@@ -98,10 +61,9 @@ on_mainwin_button_press_event(GtkWidget *widget, GdkEventButton *event,
     }
     break;
   case 2:
-    if (++fg_count >= COLOR_MAX)
-      fg_count = COLOR_WHITE;
-    gdk_rgba_free(fg_color);
-    fg_color = gdk_rgba_copy(&fgcolors[fg_count]);
+    if (++fg_count >= SCREENTEST_COLORS_MAX)
+      fg_count = SCREENTEST_COLORS_WHITE;
+    *fg_color = fgcolors[fg_count];
     gdk_window_invalidate_rect(gtk_widget_get_window(mainwin), NULL, FALSE);
     break;
   case 3:
@@ -213,11 +175,3 @@ G_MODULE_EXPORT void on_bg_color_activate(G_GNUC_UNUSED GtkMenuItem *menuitem,
   }
   gtk_widget_hide(GTK_WIDGET(bg_color_selector));
 }
-
-void set_color_bg(cairo_t *cr) {
-  cairo_set_source_rgb(cr, bg_color->red, bg_color->green, bg_color->blue);
-}
-
-void set_color_fg(cairo_t *cr) {
-  cairo_set_source_rgb(cr, fg_color->red, fg_color->green, fg_color->blue);
-}

callbacks.h

@@ -32,26 +32,4 @@ struct test_ops {
 
 extern struct test_ops basic_ops;
 
-enum test_color {
-  COLOR_WHITE,
-  COLOR_RED,
-  COLOR_GREEN,
-  COLOR_BLUE,
-  COLOR_CYAN,
-  COLOR_MAGENTA,
-  COLOR_YELLOW,
-  COLOR_BLACK,
-  COLOR_MAX
-};
-
-#define GRAYS_MAX COLOR_MAX
-
-extern GdkRGBA fgcolors[];
-extern GdkRGBA *fg_color;
-extern GdkRGBA *bg_color;
-extern GdkRGBA grays[];
-
-void set_color_bg(cairo_t *cr);
-void set_color_fg(cairo_t *cr);
-
 #endif // SCREENTEST_CALLBACKS_H

meson.build

@@ -36,6 +36,7 @@ subdir('po')
 
 screentest_srcs = [
   'callbacks.c',
+  'screentest_colors.c',
   'test_basic.c',
   'test_blink.c',
   'test_bright_pixels.c',

screentest_colors.c

@@ -0,0 +1,61 @@
+/*
+ *  Screentest - CRT/LCD monitor testing utility.
+ *  https://tobix.github.io/screentest/
+ *  Copyright (C) 2001 Jan "Yenya" Kasprzak <kas@fi.muni.cz>
+ *  Copyright (C) 2006-2017 Tobias Gruetzmacher <tobias-screentest@23.gs>
+ *  Copyright (C) 2021 Apr Thorsten Kattanek <thorsten.kattanek@gmx.de>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "screentest_colors.h"
+
+#define GRAY_VALUE(idx)                                                        \
+  ((GdkRGBA){idx / ((float)SCREENTEST_GRAYS_MAX - 1),                          \
+             idx / ((float)SCREENTEST_GRAYS_MAX - 1),                          \
+             idx / ((float)SCREENTEST_GRAYS_MAX - 1), 1.0})
+
+const GdkRGBA fgcolors[SCREENTEST_COLORS_MAX] = {
+    // WHITE
+    {1.0, 1.0, 1.0, 1.0},
+    // RED
+    {1.0, 0.0, 0.0, 1.0},
+    // GREEN
+    {0.0, 1.0, 0.0, 1.0},
+    // BLUE
+    {0.0, 0.0, 1.0, 1.0},
+    // CYAN
+    {0.0, 1.0, 1.0, 1.0},
+    // MAGENTA
+    {1.0, 0.0, 1.0, 1.0},
+    // YELLOW
+    {1.0, 1.0, 0.0, 1.0},
+    // BLACK
+    {0.0, 0.0, 0.0, 1.0}};
+GdkRGBA bg_col = {0.0, 0.0, 0.0, 1.0}; // fgcolors[SCREENTEST_COLORS_BLACK];
+GdkRGBA fg_col = {1.0, 1.0, 1.0, 1.0}; // fgcolors[SCREENTEST_COLORS_WHITE];
+GdkRGBA *const bg_color = &bg_col;
+GdkRGBA *const fg_color = &fg_col;
+const GdkRGBA grays[SCREENTEST_GRAYS_MAX] = {
+    GRAY_VALUE(0), GRAY_VALUE(1), GRAY_VALUE(2), GRAY_VALUE(3),
+    GRAY_VALUE(4), GRAY_VALUE(5), GRAY_VALUE(6), GRAY_VALUE(7),
+};
+
+void screentest_set_color_bg(cairo_t *cr) {
+  cairo_set_source_rgb(cr, bg_color->red, bg_color->green, bg_color->blue);
+}
+
+void screentest_set_color_fg(cairo_t *cr) {
+  cairo_set_source_rgb(cr, fg_color->red, fg_color->green, fg_color->blue);
+}

screentest_colors.h

@@ -0,0 +1,75 @@
+/*
+ *  Screentest - CRT/LCD monitor testing utility.
+ *  https://tobix.github.io/screentest/
+ *  Copyright (C) 2001 Jan "Yenya" Kasprzak <kas@fi.muni.cz>
+ *  Copyright (C) 2006-2017 Tobias Gruetzmacher <tobias-screentest@23.gs>
+ *  Copyright (C) 2021 Apr Thorsten Kattanek <thorsten.kattanek@gmx.de>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#ifndef SCREENTEST_COLORS_H
+#define SCREENTEST_COLORS_H
+
+#include <gdk/gdk.h>
+
+/**
+ * An array representing a predefined set of colors for screentest
+ */
+enum ScreentestColors {
+  SCREENTEST_COLORS_WHITE,
+  SCREENTEST_COLORS_RED,
+  SCREENTEST_COLORS_GREEN,
+  SCREENTEST_COLORS_BLUE,
+  SCREENTEST_COLORS_CYAN,
+  SCREENTEST_COLORS_MAGENTA,
+  SCREENTEST_COLORS_YELLOW,
+  SCREENTEST_COLORS_BLACK,
+  SCREENTEST_COLORS_MAX
+};
+
+/**
+ * One above the highest index of the `grays` array
+ */
+#define SCREENTEST_GRAYS_MAX SCREENTEST_COLORS_MAX
+
+/**
+ * @brief A pointer to the storage location of the background color (on stack)
+ */
+extern GdkRGBA *const bg_color;
+/**
+ * @brief An array holding all predefined `ScreentestColors`
+ */
+extern const GdkRGBA fgcolors[SCREENTEST_COLORS_MAX];
+/**
+ * @brief A pointer to the storage location of the foreground color (on stack)
+ */
+extern GdkRGBA *const fg_color;
+/**
+ * @brief An array holding all predefined gray value "colors"
+ */
+extern const GdkRGBA grays[SCREENTEST_GRAYS_MAX];
+
+/**
+ * @brief Set the source pattern of the given Cairo context to an opaque color
+ * @param[in,out] cr The Cairo context which is used to draw the background
+ */
+void screentest_set_color_bg(cairo_t *cr);
+/**
+ * @brief Set the source pattern of the given Cairo context to an opaque color
+ * @param[in,out] cr The Cairo context which is used to draw the foreground
+ */
+void screentest_set_color_fg(cairo_t *cr);
+
+#endif // SCREENTEST_COLORS_H

test_basic.c

@@ -26,14 +26,15 @@
 
 #include "callbacks.h"
 #include "gettext.h"
+#include "screentest_colors.h"
 #define _(String) gettext(String)
 #define N_(String) gettext_noop(String)
 
 #define BASIC_STEP 40
 
-static void draw_boxes(cairo_t *cr, GdkRGBA *colors, gint ncols, gint x, gint y,
-                       gint d) {
-  GdkRGBA *col;
+static void draw_boxes(cairo_t *cr, const GdkRGBA *colors, gint ncols, gint x,
+                       gint y, gint d) {
+  const GdkRGBA *col;
   int i;
 
   for (i = 0; i < ncols; i++) {
@@ -45,7 +46,7 @@ static void draw_boxes(cairo_t *cr, GdkRGBA *colors, gint ncols, gint x, gint y,
     x += d;
   }
 
-  set_color_fg(cr);
+  screentest_set_color_fg(cr);
 }
 
 static void basic_draw(GtkWidget *widget, cairo_t *cr) {
@@ -73,10 +74,10 @@ static void basic_draw(GtkWidget *widget, cairo_t *cr) {
 
   pl = pango_cairo_create_layout(cr);
 
-  set_color_bg(cr);
+  screentest_set_color_bg(cr);
   cairo_paint(cr);
 
-  set_color_fg(cr);
+  screentest_set_color_fg(cr);
 
   for (i = ((w - 1) % BASIC_STEP) / 2; i < w; i += BASIC_STEP)
     cairo_rectangle(cr, i, 0, 1, h);
@@ -110,14 +111,14 @@ static void basic_draw(GtkWidget *widget, cairo_t *cr) {
                   maxwidth, 4 * maxheight);
   cairo_stroke(cr);
 
-  set_color_bg(cr);
+  screentest_set_color_bg(cr);
   cairo_rectangle(cr, (w - maxwidth) / 2 + 1, d / 2 - 2 * maxheight + 1,
                   maxwidth - 1, 5 * maxheight - 1);
   cairo_rectangle(cr, (w - maxwidth) / 2 + 1, h - d / 2 - 2 * maxheight + 1,
                   maxwidth - 1, 4 * maxheight - 1);
   cairo_fill(cr);
 
-  set_color_fg(cr);
+  screentest_set_color_fg(cr);
 
   cairo_move_to(cr, (w - widths[0]) / 2, d / 2 - 4 * maxheight / 3);
   pango_layout_set_text(pl, gettext(text[0]), -1);
@@ -142,9 +143,10 @@ static void basic_draw(GtkWidget *widget, cairo_t *cr) {
   pango_cairo_show_layout(cr, pl);
 
   b = 7 * d / 4;
-  draw_boxes(cr, fgcolors, COLOR_MAX, (w - b) / 2, h / 2 - b / COLOR_MAX,
-             b / COLOR_MAX);
-  draw_boxes(cr, grays, GRAYS_MAX, (w - b) / 2, h / 2, b / GRAYS_MAX);
+  draw_boxes(cr, fgcolors, SCREENTEST_COLORS_MAX, (w - b) / 2,
+             h / 2 - b / SCREENTEST_COLORS_MAX, b / SCREENTEST_COLORS_MAX);
+  draw_boxes(cr, grays, SCREENTEST_GRAYS_MAX, (w - b) / 2, h / 2,
+             b / SCREENTEST_GRAYS_MAX);
 
   cairo_arc(cr, 0 + d / 2 + 0.5, 0 + d / 2 + 0.5, d / 2, 0,
             2 * G_PI); // Upper left

test_blink.c

@@ -23,6 +23,7 @@
 #include <gtk/gtk.h>
 
 #include "callbacks.h"
+#include "screentest_colors.h"
 
 static guint timeout;
 
@@ -40,17 +41,17 @@ static void blink_draw(GtkWidget *widget, cairo_t *cr) {
   w = gdk_window_get_width(win);
 
   if (blink_step) {
-    set_color1 = set_color_bg;
-    set_color2 = set_color_fg;
+    set_color1 = screentest_set_color_bg;
+    set_color2 = screentest_set_color_fg;
   } else {
-    set_color1 = set_color_fg;
-    set_color2 = set_color_bg;
+    set_color1 = screentest_set_color_fg;
+    set_color2 = screentest_set_color_bg;
   }
 
-  set_color_fg(cr);
+  screentest_set_color_fg(cr);
   cairo_paint(cr);
 
-  set_color_bg(cr);
+  screentest_set_color_bg(cr);
   cairo_rectangle(cr, 1, 1, w - 2, h - 2);
   cairo_fill(cr);
 

test_bright_pixels.c

@@ -24,10 +24,12 @@
 #include <stdio.h>
 
 #include "callbacks.h"
+#include "screentest_colors.h"
 
 #define COLOR_COUNT 5
-static const int color_cycle[COLOR_COUNT] = {COLOR_RED, COLOR_GREEN, COLOR_BLUE,
-                                             COLOR_WHITE, COLOR_BLACK};
+static const int color_cycle[COLOR_COUNT] = {
+    SCREENTEST_COLORS_RED, SCREENTEST_COLORS_GREEN, SCREENTEST_COLORS_BLUE,
+    SCREENTEST_COLORS_WHITE, SCREENTEST_COLORS_BLACK};
 static int current_color_idx;
 
 static void bright_pixels_init(G_GNUC_UNUSED GtkWidget *widget) {
@@ -41,7 +43,7 @@ static void bright_pixels_cycle(G_GNUC_UNUSED GtkWidget *widget) {
 }
 
 static void bright_pixels_draw(GtkWidget *widget, cairo_t *cr) {
-  GdkRGBA *col;
+  const GdkRGBA *col;
 
   col = &fgcolors[color_cycle[current_color_idx]];
   cairo_set_source_rgb(cr, col->red, col->green, col->blue);