Add layouts

1 files changed, 105 insertions, 0 deletions

diff --git a/src/layout.c b/src/layout.c
new file mode 100644
index 0000000..db6e435
--- /dev/null
+++ b/src/layout.c
@@ -0,0 +1,105 @@
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "any_log.h"
+#include "layout.h"
+
+layout_t *layout_create(block_t *block, layout_info_t info)
+{
+    assert(!block->hidden);
+
+    layout_t *layout = calloc(1, sizeof(layout_t));
+    layout->block = block;
+    layout->x = info.x_offset;
+    layout->y = 0;
+    layout->x_padding = block->x_padding;
+    layout->y_padding = block->y_padding;
+    layout->height = info.height;
+
+    if (block->type == BLOCK_GROUP) {
+        layout->children = calloc(block->group.n_children, sizeof(layout_t));
+
+        for (int i = 0; i < block->group.n_children; i++) {
+            if (block->group.children[i].hidden)
+                continue;
+
+            layout_t *child = layout_create(&block->group.children[i], info);
+            info.x_offset += child->width + block->group.spacing;
+            layout->children[layout->n_children++] = child;
+        }
+    } else if (block->type == BLOCK_TEXT) {
+        layout->pl = pango_layout_new(info.context);
+
+        pango_layout_set_font_description(layout->pl, info.fontdesc);
+        pango_layout_set_alignment(layout->pl, block->text.text_align);
+        pango_layout_set_height(layout->pl, 0);
+        pango_layout_set_text(layout->pl, block->text.text, -1);
+        pango_layout_get_pixel_size(layout->pl, &layout->text_width, &layout->text_height);
+
+        int length = strlen(block->text.text);
+        layout->width = info.height + (length != 1) * layout->text_width;
+    }
+
+    return layout;
+}
+
+void layout_render(layout_t *layout, cairo_t *cr)
+{
+    double degree = M_PI / 180.0;
+    int radius = layout->height / 2 - layout->y_padding;
+    int line_radius = radius - layout->block->line_width / 2;
+
+    // Render background
+    color_t color = layout->block->color;
+    cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
+
+    cairo_new_sub_path(cr);
+    cairo_arc(cr, layout->x + layout->x_padding + radius, layout->y + layout->y_padding + radius, radius, 90 * degree, 270 * degree);
+    cairo_arc(cr, layout->x + layout->width - layout->x_padding - radius, layout->y + layout->y_padding + radius, radius, 270 * degree, 450 * degree);
+    cairo_close_path(cr);
+    cairo_fill(cr);
+
+    // Render border
+    color = layout->block->line_color;
+    cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
+    cairo_set_line_width(cr, layout->block->line_width);
+
+    cairo_new_sub_path(cr);
+    cairo_arc(cr, layout->x + layout->x_padding + radius, layout->y + layout->y_padding + radius, line_radius, 90 * degree, 270 * degree);
+    cairo_arc(cr, layout->x + layout->width - layout->x_padding - radius, layout->y + layout->y_padding + radius, line_radius, 270 * degree, 450 * degree);
+    cairo_close_path(cr);
+    cairo_stroke(cr);
+
+    if (layout->block->type == BLOCK_GROUP) {
+        for (int i = 0; i < layout->n_children; i++) {
+            cairo_push_group(cr);
+            layout_render(layout->children[i], cr);
+            cairo_pop_group_to_source(cr);
+            cairo_paint(cr);
+        }
+    } else if (layout->block->type == BLOCK_TEXT) {
+        int text_x = layout->x + (layout->width  - layout->text_width) / 2;
+        int text_y = layout->y + (layout->height - layout->text_height) / 2;
+
+        color = layout->block->text.text_color;
+        cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
+        cairo_move_to(cr, text_x, text_y);
+
+        pango_layout_set_text(layout->pl, layout->block->text.text, -1);
+        pango_cairo_update_layout(cr, layout->pl);
+        pango_cairo_show_layout(cr, layout->pl);
+    }
+}
+
+void layout_free(layout_t *layout)
+{
+    for (int i = 0; i < layout->n_children; i++)
+        layout_free(layout->children[i]);
+
+    if (layout->pl != NULL)
+        g_object_unref(layout->pl);
+
+    free(layout);
+}