From 5ac5c25c299b3c1d390c68c3d04ae979e787def0 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Wed, 30 Apr 2025 11:37:49 -0400
Subject: canvas widget

---
 renderer.h |  2 ++
 widget.c   | 17 +++++++++++++++++
 widget.h   |  8 ++++++++
 3 files changed, 27 insertions(+)

diff --git a/renderer.h b/renderer.h
index 84651f9..9bdbfa5 100644
--- a/renderer.h
+++ b/renderer.h
@@ -3,9 +3,11 @@ void r_free(void);
 void r_input(mu_Context *ctx);
 void r_render(mu_Context *ctx);
 void r_get_window_size(int *w, int *h);
+
 int r_add_icon(const char *path);
 void r_remove_icon(int);
 void r_get_icon_size(int id, int *w, int *h);
+
 int r_add_canvas(const char *bg_img_path);
 void r_remove_canvas(int id);
 int r_canvas_draw_circle(int id, int x, int y, int r, mu_Color color);
diff --git a/widget.c b/widget.c
index 721055b..8f864c3 100644
--- a/widget.c
+++ b/widget.c
@@ -333,3 +333,20 @@ update_active(mu_Context *ctx, mu_Id id, mu_Rect r, int *active) {
 	mu_update_control(ctx, id, r, 0);
 	*active ^= (ctx->mouse_pressed == MU_MOUSE_LEFT && ctx->focus == id);
 }
+
+/* Create a canvas with the background loaded from an image file. Returns non-zero on error. */
+int
+w_init_canvas(w_Canvas *c, const char *bg_img_path) {
+	c->id = r_add_canvas(bg_img_path);
+	if (c->id < 0) {
+		weprintf("failed to create canvas widget");
+		return 1;
+	}
+	return 0;
+}
+
+void
+w_free_canvas(w_Canvas *c) {
+	r_remove_canvas(c->id);
+	c->id = -1;
+}
diff --git a/widget.h b/widget.h
index ab30f7a..e9ee3d5 100644
--- a/widget.h
+++ b/widget.h
@@ -74,3 +74,11 @@ void w_init_image(w_Image *img);
 void w_free_image(w_Image *img);
 int w_set_image(w_Image *img, const char *path);
 void w_image(mu_Context *ctx, w_Image *img);
+
+
+typedef struct {
+	int id; /* renderer canvas id. */
+} w_Canvas;
+
+int w_init_canvas(w_Canvas *c, const char *bg_img_path);
+void w_free_canvas(w_Canvas *c);
-- 
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