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-rw-r--r--utils/nscolour.c282
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diff --git a/utils/nscolour.c b/utils/nscolour.c
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+/*
+ * Copyright 2020 Michael Drake <tlsa@netsurf-browser.org>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf 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; version 2 of the License.
+ *
+ * NetSurf 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file
+ * NetSurf UI colours (implementation).
+ *
+ * Builds common colours used throughout NetSurf's interface.
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#include "netsurf/inttypes.h"
+#include "netsurf/plot_style.h"
+
+#include "utils/errors.h"
+#include "utils/nscolour.h"
+#include "desktop/system_colour.h"
+
+colour nscolours[NSCOLOUR__COUNT];
+
+/**
+ * Set some colours up from a couple of system colour entries.
+ *
+ * \param[in] name_bg Name of choices string for background colour lookup.
+ * \param[in] name_fg Name of choices string for foreground colour lookup.
+ * \param[in] bg_num Numerator for background adjustment ratio.
+ * \param[in] bg_den Denominator for backfground adjustment ratio.
+ * \param[out] bg Returns the background colour.
+ * \param[out] bg_hover Returns the hovered background colour.
+ * \param[out] fg Returns the foreground colour.
+ * \param[out] fg_subtle Returns the subtle foreground colour.
+ * \param[out] fg_faded Returns the faded foreground colour.
+ * \param[out] fg_good Returns the good foreground colour.
+ * \param[out] fg_bad Returns the bad foreground colour.
+ * \param[out] border Returns the border colour.
+ */
+static nserror nscolour__get(
+ const char *name_bg,
+ const char *name_fg,
+ unsigned bg_num,
+ unsigned bg_den,
+ colour *bg,
+ colour *bg_hover,
+ colour *fg,
+ colour *fg_subtle,
+ colour *fg_faded,
+ colour *fg_good,
+ colour *fg_bad,
+ colour *border)
+{
+ nserror res;
+ bool dark_mode;
+ colour bg_sys;
+
+ assert(name_bg != NULL);
+ assert(name_fg != NULL);
+ assert(bg != NULL);
+ assert(fg != NULL);
+
+ /* user configured background colour */
+ res = ns_system_colour_char(name_bg, &bg_sys);
+ if (res != NSERROR_OK) {
+ return res;
+ }
+
+ /* user configured foreground colour */
+ res = ns_system_colour_char(name_fg, fg);
+ if (res != NSERROR_OK) {
+ return res;
+ }
+
+ /* if there is a valid background fraction apply it */
+ if (bg_num < bg_den) {
+ *bg = mix_colour(bg_sys, *fg, 255 * bg_num / bg_den);
+ } else {
+ *bg = bg_sys;
+ }
+
+ dark_mode = colour_lightness(*fg) > colour_lightness(*bg);
+
+ if (bg_hover != NULL) {
+ *bg_hover = dark_mode ?
+ half_lighten_colour(*bg) :
+ half_darken_colour(*bg);
+ }
+
+ if (fg_subtle != NULL) {
+ *fg_subtle = mix_colour(*fg, *bg, 255 * 25 / 32);
+ }
+
+ if (fg_faded != NULL) {
+ *fg_faded = mix_colour(*fg, *bg, 255 * 20 / 32);
+ }
+
+ if (fg_good != NULL) {
+ *fg_good = colour_engorge_component(*fg, !dark_mode,
+ PLOT_COLOUR_COMPONENT_GREEN);
+ }
+
+ if (fg_bad != NULL) {
+ *fg_bad = colour_engorge_component(*fg, !dark_mode,
+ PLOT_COLOUR_COMPONENT_RED);
+ }
+
+ if (border != NULL) {
+ *border = mix_colour(*fg, bg_sys, 255 * 8 / 32);
+ }
+
+ return NSERROR_OK;
+}
+
+/* Exported interface, documented in utils/nscolour.h */
+nserror nscolour_update(void)
+{
+ nserror res;
+
+ res = nscolour__get("Window", "WindowText", 16, 16,
+ &nscolours[NSCOLOUR_WIN_EVEN_BG],
+ &nscolours[NSCOLOUR_WIN_EVEN_BG_HOVER],
+ &nscolours[NSCOLOUR_WIN_EVEN_FG],
+ &nscolours[NSCOLOUR_WIN_EVEN_FG_SUBTLE],
+ &nscolours[NSCOLOUR_WIN_EVEN_FG_FADED],
+ &nscolours[NSCOLOUR_WIN_EVEN_FG_GOOD],
+ &nscolours[NSCOLOUR_WIN_EVEN_FG_BAD],
+ &nscolours[NSCOLOUR_WIN_EVEN_BORDER]);
+ if (res != NSERROR_OK) {
+ return res;
+ }
+
+ res = nscolour__get("Window", "WindowText", 15, 16,
+ &nscolours[NSCOLOUR_WIN_ODD_BG],
+ &nscolours[NSCOLOUR_WIN_ODD_BG_HOVER],
+ &nscolours[NSCOLOUR_WIN_ODD_FG],
+ &nscolours[NSCOLOUR_WIN_ODD_FG_SUBTLE],
+ &nscolours[NSCOLOUR_WIN_ODD_FG_FADED],
+ &nscolours[NSCOLOUR_WIN_ODD_FG_GOOD],
+ &nscolours[NSCOLOUR_WIN_ODD_FG_BAD],
+ &nscolours[NSCOLOUR_WIN_ODD_BORDER]);
+ if (res != NSERROR_OK) {
+ return res;
+ }
+
+ res = nscolour__get("Highlight", "HighlightText", 16, 16,
+ &nscolours[NSCOLOUR_SEL_BG],
+ NULL,
+ &nscolours[NSCOLOUR_SEL_FG],
+ &nscolours[NSCOLOUR_SEL_FG_SUBTLE],
+ NULL,
+ NULL,
+ NULL,
+ NULL);
+ if (res != NSERROR_OK) {
+ return res;
+ }
+
+ res = ns_system_colour_char("Scrollbar",
+ &nscolours[NSCOLOUR_SCROLL_WELL]);
+ if (res != NSERROR_OK) {
+ return res;
+ }
+
+ res = nscolour__get("ButtonFace", "ButtonText", 16, 16,
+ &nscolours[NSCOLOUR_BUTTON_BG],
+ NULL,
+ &nscolours[NSCOLOUR_BUTTON_FG],
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL);
+ if (res != NSERROR_OK) {
+ return res;
+ }
+
+ nscolours[NSCOLOUR_TEXT_INPUT_BG] =
+ colour_to_bw_nearest(nscolours[NSCOLOUR_WIN_EVEN_BG]);
+ nscolours[NSCOLOUR_TEXT_INPUT_FG] =
+ colour_to_bw_nearest(nscolours[NSCOLOUR_WIN_EVEN_FG]);
+ nscolours[NSCOLOUR_TEXT_INPUT_FG_SUBTLE] =
+ blend_colour(nscolours[NSCOLOUR_TEXT_INPUT_BG],
+ nscolours[NSCOLOUR_TEXT_INPUT_FG]);
+
+ return NSERROR_OK;
+}
+
+/* Exported interface, documented in utils/nscolour.h */
+nserror nscolour_get_stylesheet(const char **stylesheet_out)
+{
+ static char buffer[640];
+ int ret;
+
+ assert(stylesheet_out != NULL);
+
+ ret = snprintf(buffer, sizeof(buffer),
+ ".ns-odd-bg {\n"
+ "\tbackground-color: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-odd-bg-hover {\n"
+ "\tbackground-color: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-odd-fg {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-odd-fg-subtle {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-odd-fg-faded {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-odd-fg-good {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-odd-fg-bad {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-even-bg {\n"
+ "\tbackground-color: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-even-bg-hover {\n"
+ "\tbackground-color: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-even-fg {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-even-fg-subtle {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-even-fg-faded {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-even-fg-good {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-even-fg-bad {\n"
+ "\tcolor: #%06"PRIx32";\n"
+ "}\n"
+ ".ns-border {\n"
+ "\tborder-color: #%06"PRIx32";\n"
+ "}\n",
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_ODD_BG]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_ODD_BG_HOVER]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_ODD_FG]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_ODD_FG_SUBTLE]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_ODD_FG_FADED]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_ODD_FG_GOOD]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_ODD_FG_BAD]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_BG]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_BG_HOVER]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_FG]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_FG_SUBTLE]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_FG_FADED]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_FG_GOOD]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_FG_BAD]),
+ colour_rb_swap(nscolours[NSCOLOUR_WIN_EVEN_BORDER]));
+ assert(ret > 0 && (size_t)ret < sizeof(buffer));
+ if (ret < 0 || (size_t)ret >= sizeof(buffer)) {
+ /* Error or buffer too small */
+ return NSERROR_NOSPACE;
+ }
+
+ *stylesheet_out = buffer;
+ return NSERROR_OK;
+}
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