feat(bar): 实现 bar_draw 渲染骨架及文字排版绘制接口

src/bar/bar.c

@@ -2,6 +2,7 @@
 
 #include <cairo.h>
 #include <stddef.h>
+#include <stdint.h>
 #include <zdwm/bar.h>
 #include <zdwm/types.h>
 
@@ -92,3 +93,32 @@ void bar_cleanup(bar_t *bar) {
   p_delete(&bar->bars);
   bar->count = 0;
 }
+
+static void bar_draw_item(
+  zdwm_bar_item_t *item,
+  text_context_t *context,
+  cairo_t *cr,
+  int32_t width,
+  int32_t height
+) {
+  /* TODO: */
+}
+
+void bar_draw(bar_t *bar) {
+  auto ctx = bar->ctx;
+
+  for (size_t i = 0; i < bar->count; ++i) {
+    auto bar_output = &bar->bars[i];
+    auto cr         = bar_output->cr;
+    auto width      = bar_output->width;
+    auto height     = bar_output->height;
+
+    for (size_t j = 0; j < ZDWM_BAR_SIDE_COUNT; ++j) {
+      auto side = &bar_output->sides[j];
+      for (size_t k = 0; k < side->count; ++k) {
+        auto item = &side->items[k];
+        bar_draw_item(item, ctx, cr, width, height);
+      }
+    }
+  }
+}

src/bar/bar.h

@@ -2,6 +2,7 @@
 
 #include <cairo.h>
 #include <stddef.h>
+#include <stdint.h>
 #include <zdwm/bar.h>
 #include <zdwm/types.h>
 
@@ -13,6 +14,8 @@ typedef struct bar_output_t {
   cairo_t *cr;
   zdwm_window_id_t window_id;
   zdwm_output_id_t output_id;
+  int32_t width;
+  int32_t height;
   bar_side_t sides[ZDWM_BAR_SIDE_COUNT];
 } bar_output_t;
 
@@ -33,3 +36,4 @@ typedef struct bar_t {
 
 void bar_init(bar_t *bar);
 void bar_cleanup(bar_t *bar);
+void bar_draw(bar_t *bar);

src/bar/text.c

@@ -1,5 +1,7 @@
 #include "bar/text.h"
 
+#include <assert.h>
+#include <cairo.h>
 #include <glib-object.h>
 #include <pango/pango-attributes.h>
 #include <pango/pango-context.h>
@@ -7,6 +9,7 @@
 #include <pango/pango-layout.h>
 #include <pango/pango-types.h>
 #include <pango/pangocairo.h>
+#include <stdint.h>
 
 #include "base/memory.h"
 
@@ -67,3 +70,72 @@ void text_context_destory(text_context_t *context) {
 
   p_delete(&context);
 }
+
+static inline void
+get_layout_size(PangoLayout *layout, int32_t *width, int32_t *height) {
+  pango_layout_get_pixel_size(layout, width, height);
+}
+
+void text_context_get_text_size(
+  text_context_t *context,
+  const char *text,
+  int32_t *width,
+  int32_t *height
+) {
+  assert(context && text);
+  if (!width && !height) return;
+
+  auto layout = context->layout;
+
+  pango_layout_set_width(layout, -1);
+  pango_layout_set_height(layout, 0);
+  pango_layout_set_text(layout, text, -1);
+
+  get_layout_size(layout, width, height);
+}
+
+void draw_text(
+  cairo_t *cr,
+  text_context_t *context,
+  const char *text,
+  color_t *color,
+  zdwm_rect_t area
+) {
+  assert(cr);
+  assert(context);
+  assert(text);
+  assert(color);
+
+  auto layout = context->layout;
+  pango_layout_set_width(layout, area.width * PANGO_SCALE);
+  pango_layout_set_text(layout, text, -1);
+
+  cairo_set_source_rgba(
+    cr,
+    color->red,
+    color->green,
+    color->blue,
+    color->alpha
+  );
+
+  int32_t height = 0;
+  get_layout_size(layout, nullptr, &height);
+
+  double offset_y = (area.height - height) / 2.0;
+  pango_cairo_update_layout(cr, layout);
+  cairo_move_to(cr, area.x, offset_y + area.y);
+  pango_cairo_show_layout(cr, layout);
+}
+
+void draw_background(cairo_t *cr, color_t *color, zdwm_rect_t area) {
+  cairo_move_to(cr, area.x, area.y);
+  cairo_set_source_rgba(
+    cr,
+    color->red,
+    color->green,
+    color->blue,
+    color->alpha
+  );
+  cairo_rectangle(cr, area.x, area.y, area.width, area.height);
+  cairo_fill(cr);
+}

src/bar/text.h

@@ -1,9 +1,27 @@
 #pragma once
 
+#include <cairo.h>
 #include <stdint.h>
+#include <zdwm/types.h>
+
+#include "base/color.h"
 
 typedef struct text_context_t text_context_t;
 
 text_context_t *
 text_context_create(const char *family, uint32_t size, uint32_t dpi);
 void text_context_destory(text_context_t *context);
+void text_context_get_text_size(
+  text_context_t *context,
+  const char *text,
+  int32_t *width,
+  int32_t *height
+);
+void draw_text(
+  cairo_t *cr,
+  text_context_t *context,
+  const char *text,
+  color_t *color,
+  zdwm_rect_t area
+);
+void draw_background(cairo_t *cr, color_t *color, zdwm_rect_t area);

src/runtime/runtime.c

@@ -226,6 +226,8 @@ static void runtime_init_bar(runtime_t *runtime) {
     bar_output->cr        = bar_window.cr;
     bar_output->window_id = bar_window.window_id;
     bar_output->output_id = output->id;
+    bar_output->width     = bar_rect.width;
+    bar_output->height    = bar_rect.height;
   }
 
   bar_init(&runtime->bar);