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#include <glib.h>
#include <math.h>
#include <pango/pangocairo.h>
#include <pango/pango-font.h>
#include <pango/pango-types.h>
#include "draw.h"
#include "button.h"
#include "log.h"
// Idea: Either make a to_draw queue where we put things we schedule to redraw
// (this will also work for animations in the future)
// or use some flags to trigger drawing
static void layout_destroy(Layout *layout)
{
g_object_unref(layout->pl);
g_free(layout);
}
Drawable *draw_create(const char *font, int height, int left_pad, int right_pad, int top_pad, double alpha)
{
Drawable *draw = g_malloc(sizeof(Drawable));
g_assert_nonnull(draw);
log_debug("Pango loading font description '%s'", font);
draw->desc = pango_font_description_from_string(font);
log_debug("Pango found matching font '%s'", pango_font_description_get_family(draw->desc));
draw->height = height;
draw->left_pad = left_pad;
draw->right_pad = right_pad;
draw->top_pad = top_pad;
draw->alpha = alpha;
g_assert(alpha >= 0 && alpha <= 1);
draw->layouts = NULL;
log_debug("Draw context created [height=%d, left_pad=%d, right_pad=%d, top_pad=%d, alpha=%.2lf]", height, left_pad, right_pad, top_pad, alpha);
return draw;
}
static void compute_width(Drawable *draw, Window *win, int *width, int *height)
{
// FIXME: Does not work for scale != 1
//double scale = window_get_scale(win);
double scale = 1;
int screen_width = win->con->screen_size->width;
int screen_height = win->con->screen_size->height;
*width = round(screen_width - draw->right_pad - draw->left_pad * scale);
*height = round(draw->height * scale);
}
void draw_paint(Drawable *draw, Window *win)
{
// FIXME: Does not work for scale != 1
//double scale = window_get_scale(win);
double scale = 1;
int width, height;
compute_width(draw, win, &width, &height);
cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_t *cr = cairo_create(surface);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
int radius = height / 2;
double degree = M_PI / 180.0;
cairo_set_source_rgba(cr, 0.3, 0.3, 0.3, draw->alpha);
// TODO: Here we should paint the shape of the bar, however there is a problem with the surface
// painted in the pixmap to mask the window shape in window_paint_corners.
//
// This is caused by some difference between the two shapes (that should technically be the same)
// which causes a mismatch between the two layers and leaves some black pixels visible
//cairo_arc(cr, radius, radius, radius, 90.0 * degree, 270 * degree);
//cairo_arc(cr, width - radius, radius, radius, 270 * degree, 450 * degree);
//cairo_fill(cr);
cairo_paint(cr);
int line_w = 1 * scale;
cairo_set_line_width(cr, line_w);
for (GList *it = draw->layouts; it; it = it->next) {
Layout *layout = it->data;
int text_x = layout->x + (layout->width / 2) - (layout->text_w / 2);
int text_y = layout->y + (layout->height / 2) - (layout->text_h / 2);
// purple
cairo_set_source_rgba(cr, 0.502, 0.168, 0.886, 1);
cairo_new_sub_path(cr);
cairo_arc(cr, layout->x + radius, layout->y + radius, radius, 90 * degree, 270 * degree);
cairo_arc(cr, layout->x + layout->width - radius, layout->y + radius, radius, 270 * degree, 450 * degree);
cairo_close_path(cr);
cairo_fill(cr);
cairo_set_source_rgba(cr, 0.8, 0.8, 0.8, 1);
cairo_new_sub_path(cr);
cairo_arc(cr, layout->x + radius, layout->y + radius, radius - line_w , 90 * degree, 270 * degree);
cairo_arc(cr, layout->x + layout->width - radius, layout->y + radius, radius - line_w, 270 * degree, 450 * degree);
cairo_close_path(cr);
cairo_stroke(cr);
cairo_set_source_rgb(cr, 0.8, 0.8, 0.8);
cairo_move_to(cr, text_x, text_y);
pango_cairo_update_layout(cr, layout->pl);
pango_cairo_show_layout(cr, layout->pl);
}
cairo_destroy(cr);
// TODO: Move these somewhere else
window_move(win, draw->left_pad, draw->top_pad);
window_resize(win, width, draw->height);
window_paint_surface(win, surface, width, height);
cairo_surface_destroy(surface);
}
static gint align_compare(gconstpointer a, gconstpointer b)
{
PangoAlignment a_align = ((Button *)a)->align;
PangoAlignment b_align = ((Button *)b)->align;
if (a_align < b_align) return -1;
if (a_align > b_align) return 1;
return 0;
}
void draw_compute_layout(Drawable *draw, Window *win, GList *btns)
{
g_list_free_full(draw->layouts, (GDestroyNotify)layout_destroy);
draw->layouts = NULL;
// FIXME: Does not work for scale != 1
//double scale = window_get_scale(win);
double scale = 1;
int width, height;
compute_width(draw, win, &width, &height);
int x = 0;
int radius = height / 2;
int sep = 10 * scale;
int line_w = 1 * scale;
btns = g_list_sort(btns, align_compare);
GList *adjust_center = NULL;
GList *adjust_right = NULL;
int end_xs[3] = { 0 };
Button *prev = NULL;
for (GList *it = btns; it; it = it->next) {
Button *btn = it->data;
Layout *layout = g_malloc(sizeof(Layout));
layout->btn = btn;
layout->x = x;
layout->y = 0;
layout->pl = pango_cairo_create_layout(window_get_context(win));
pango_layout_set_font_description(layout->pl, draw->desc);
pango_layout_set_text(layout->pl, btn->text, -1);
pango_layout_set_alignment(layout->pl, PANGO_ALIGN_CENTER);
int text_w, text_h;
pango_layout_get_pixel_size(layout->pl, &text_w, &text_h);
layout->text_w = ceil(text_w / scale);
layout->text_h = ceil(text_h / scale);
// If there is only one glyph the button should be round
size_t text_l = g_utf8_strlen(btn->text, -1);
layout->width = text_l == 1 ? height : layout->text_w + 2 * radius;
layout->height = height;
draw->layouts = g_list_prepend(draw->layouts, layout);
if (prev != NULL) {
if (prev->align == btn->align) {
x += sep;
// Ugly update for layout
layout->x = x;
} else {
if (btn->align == PANGO_ALIGN_CENTER) adjust_center = draw->layouts;
else if (btn->align == PANGO_ALIGN_RIGHT) adjust_right = draw->layouts;
}
}
x += layout->width + line_w * 2;
prev = btn;
end_xs[btn->align] = x;
}
draw->layouts = g_list_reverse(draw->layouts);
int widths[3] = {
end_xs[0],
end_xs[1] - end_xs[0],
end_xs[2] - MAX(end_xs[1], end_xs[0]),
};
int start_xs[3] = {
0,
end_xs[0],
MAX(end_xs[1], end_xs[0]),
};
log_info("e1 = %d, e2 = %d, e3 = %d", end_xs[0], end_xs[1], end_xs[2]);
log_info("s1 = %d, s2 = %d, s3 = %d", start_xs[0], start_xs[1], start_xs[2]);
log_info("w1 = %d, w2 = %d, w3 = %d", widths[0], widths[1], widths[2]);
int center = round(width / 2);
int center_off = (center - widths[1] / 2) - start_xs[1];
log_debug("Aligning center layout [x=%d, off=%d]", center, center_off);
for (GList *it = adjust_center; it != adjust_right; it = it->next) {
Layout *layout = it->data;
layout->x += center_off;
}
int right = width - widths[2];
// The width is off by 2 line width
int right_off = right - start_xs[2] + 2 * line_w;
log_debug("Aligning right layout [x=%d, off=%d]", right, right_off);
for (GList *it = adjust_right; it != NULL; it = it->next) {
Layout *layout = it->data;
layout->x += right_off;
}
log_debug("Updated layouts");
g_list_free(btns);
}
void draw_destroy(Drawable *draw)
{
g_list_free_full(draw->layouts, (GDestroyNotify)layout_destroy);
pango_font_description_free(draw->desc);
g_free(draw);
}
// vim: ts=4 sw=4 et
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