renderer: clean up `image.zig`, reduce repetitive code

2 files changed, 19 insertions, 1 deletions

diff --git a/pkg/wuffs/src/main.zig b/pkg/wuffs/src/main.zig
index be4eb9184..89f3c008c 100644
--- a/pkg/wuffs/src/main.zig
+++ b/pkg/wuffs/src/main.zig
@@ -8,7 +8,7 @@ pub const Error = @import("error.zig").Error;
 pub const ImageData = struct {
     width: u32,
     height: u32,
-    data: []const u8,
+    data: []u8,
 };
 
 test {
diff --git a/pkg/wuffs/src/swizzle.zig b/pkg/wuffs/src/swizzle.zig
index d57da98a9..352cf2b50 100644
--- a/pkg/wuffs/src/swizzle.zig
+++ b/pkg/wuffs/src/swizzle.zig
@@ -33,6 +33,24 @@ pub fn rgbToRgba(alloc: Allocator, src: []const u8) Error![]u8 {
     );
 }
 
+pub fn bgrToRgba(alloc: Allocator, src: []const u8) Error![]u8 {
+    return swizzle(
+        alloc,
+        src,
+        c.WUFFS_BASE__PIXEL_FORMAT__BGR,
+        c.WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL,
+    );
+}
+
+pub fn bgraToRgba(alloc: Allocator, src: []const u8) Error![]u8 {
+    return swizzle(
+        alloc,
+        src,
+        c.WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL,
+        c.WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL,
+    );
+}
+
 fn swizzle(
     alloc: Allocator,
     src: []const u8,