From b3996a9109a32eb83f877ba7cd1b1271c5cbe975 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Yaroslav=20de=20la=20Pe=C3=B1a=20Smirnov?=
 <yps@yaroslavps.com>
Date: Sat, 14 Sep 2024 23:58:53 +0300
Subject: improve pango and cairo bindings

---
 src/main.zig | 50 +++++++++++++++++++++++++++-----------------------
 1 file changed, 27 insertions(+), 23 deletions(-)

(limited to 'src/main.zig')

diff --git a/src/main.zig b/src/main.zig
index 436e14d..ebf2ac6 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -27,7 +27,9 @@ const WindowBuffer = struct {
     /// Backing data slice from memory mapping for this buffer
     map: []u8,
     /// Cairo surface for painting with cairo
-    c_surface: cairo.Surface,
+    cr_surface: *cairo.Surface,
+    /// Cairo context
+    cr_ctx: *cairo.Context,
     /// Are we being read by the compositor right now?
     busy: bool = false,
 };
@@ -48,7 +50,7 @@ pub const Window = struct {
     /// Memory mapped for both buffers
     buffers_map: []align(mem.page_size) u8 = undefined,
     /// Pango font description for rendering our text
-    font: pango.FontDescription,
+    font_dsc: *pango.FontDescription,
     /// This window's title
     title: [*:0]const u8,
     /// Width in pixels
@@ -74,15 +76,15 @@ pub const Window = struct {
             .allocator = allocator,
             .wl_surface = try compositor.createSurface(),
             .title = title,
-            // .font = try pango.FontDescription.fromString("monospace 24"),
-            .font = try pango.FontDescription.create(),
+            // .font_dsc = try pango.FontDescription.fromString("monospace 24"),
+            .font_dsc = try pango.FontDescription.create(),
         };
         win.xdg_surface = try wm_base.getXdgSurface(win.wl_surface);
         win.xdg_toplevel = try win.xdg_surface.getToplevel();
 
-        win.font.setFamily("monospace");
-        win.font.setWeight(600);
-        win.font.setSizePt(18);
+        win.font_dsc.setFamily("monospace");
+        win.font_dsc.setWeight(600);
+        win.font_dsc.setSizePt(18);
 
         try win.allocBuffers();
 
@@ -102,7 +104,7 @@ pub const Window = struct {
     /// Destroy this window and all its associated resources
     pub fn destroy(win: *Window) void {
         win.destroyBuffers();
-        win.font.destroy();
+        win.font_dsc.destroy();
         win.xdg_toplevel.destroy();
         win.xdg_surface.destroy();
         win.wl_surface.destroy();
@@ -111,8 +113,8 @@ pub const Window = struct {
 
     /// Allocate new buffers for this window
     fn allocBuffers(win: *Window) !void {
-        const c_format = cairo.Format.argb32;
-        const stride = cairo.Surface.formatStrideForWidth(c_format, win.width);
+        const cr_format = cairo.Format.argb32;
+        const stride = cr_format.strideForWidth(win.width);
         const buffer_size = stride * win.height;
         const total_size = buffer_size * 2; // we need two buffers
 
@@ -142,23 +144,25 @@ pub const Window = struct {
             const bsize: usize = @intCast(buffer_size);
             buffer.busy = false;
             buffer.map = win.buffers_map[bsize *% i .. bsize *% (i + 1)];
-            buffer.c_surface = try cairo.Surface.createImageForData(
+            buffer.cr_surface = try cairo.Surface.createImageForData(
                 buffer.map,
-                c_format,
+                cr_format,
                 win.width,
                 win.height,
                 stride,
             );
+            buffer.cr_ctx = try cairo.Context.create(buffer.cr_surface);
             buffer.wl_buffer.setListener(*WindowBuffer, bufferListener, buffer);
         }
     }
 
     /// Destroy this window's buffers
     fn destroyBuffers(win: *Window) void {
-        win.buffers[0].c_surface.destroy();
-        win.buffers[1].c_surface.destroy();
-        win.buffers[0].wl_buffer.destroy();
-        win.buffers[1].wl_buffer.destroy();
+        inline for (&win.buffers) |*buffer| {
+            buffer.cr_ctx.destroy();
+            buffer.cr_surface.destroy();
+            buffer.wl_buffer.destroy();
+        }
         posix.munmap(win.buffers_map);
     }
 
@@ -190,14 +194,14 @@ pub const Window = struct {
             }
         }
 
-        const layout = try pango.Layout.createForCairo(&buffer.c_surface);
+        const layout = try pango.Layout.createForCairo(buffer.cr_ctx);
         defer layout.unref();
-        buffer.c_surface.setSourceRgba(1, 1, 1, 1);
+        buffer.cr_ctx.setSourceRgba(1, 1, 1, 1);
 
-        layout.setFont(win.font);
+        layout.setFontDescription(win.font_dsc);
         layout.setText("Hello, wayland!", -1);
-        buffer.c_surface.moveTo(5, 5);
-        layout.show(&buffer.c_surface);
+        buffer.cr_ctx.moveTo(5, 5);
+        buffer.cr_ctx.showPangoLayout(layout);
 
         var fps_buf: [32]u8 = undefined;
         const fps_output = std.fmt.bufPrintZ(
@@ -206,8 +210,8 @@ pub const Window = struct {
             .{win.current_fps},
         ) catch unreachable;
         layout.setText(fps_output, -1);
-        buffer.c_surface.moveTo(5, 40);
-        layout.show(&buffer.c_surface);
+        buffer.cr_ctx.moveTo(5, 40);
+        buffer.cr_ctx.showPangoLayout(layout);
 
         buffer.busy = true;
         return buffer.wl_buffer;
-- 
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