estd: add graphics module

1 files changed, 13 insertions, 5 deletions

diff --git a/src/screen/drm/buffer/root.zig b/src/screen/drm/buffer/root.zig
index d40fd8d..f14ed66 100644
--- a/src/screen/drm/buffer/root.zig
+++ b/src/screen/drm/buffer/root.zig
@@ -1,4 +1,5 @@
 const drm = @import("../root.zig");
+const graphics = @import("estd").graphics;
 
 pub const Buffer = struct {
 	const Self = @This();
@@ -7,7 +8,7 @@ pub const Buffer = struct {
 	current: Raw,
 	crtc: Raw,
 
-	pub fn init(card: *drm.Card, width: u32, height: u32) !Self {
+	pub fn init(card: drm.Card, width: u32, height: u32) !Self {
 		return .{
 			.current = try Raw.init(card, width, height),
 			.crtc = try Raw.init(card, width, height),
@@ -15,10 +16,6 @@ pub const Buffer = struct {
 	}
 
 	pub fn swap(self: *Self) void {
-		const pixels = self.current.pixels;
-		self.current.pixels = self.crtc.pixels;
-		self.crtc.pixels = pixels;
-
 		const bytes = self.current.bytes;
 		self.current.bytes = self.crtc.bytes;
 		self.crtc.bytes = bytes;
@@ -32,5 +29,16 @@ pub const Buffer = struct {
 		self.current.deinit();
 		self.crtc.deinit();
 	}
+
+	pub fn canvas(self: *Self) graphics.Canvas {
+		return .{
+			.width = self.current.width,
+			.height = self.current.height,
+			.buffer = @as(
+				[*]volatile graphics.Pixel,
+				@ptrCast(@alignCast(self.current.bytes))
+			)[0..self.current.bytes.len / 4],
+		};
+	}
 };