diff --git a/internal/atlas/image.go b/internal/atlas/image.go
index 9b37c045e..c5e90c41e 100644
--- a/internal/atlas/image.go
+++ b/internal/atlas/image.go
@@ -459,8 +459,8 @@ func (i *Image) drawTriangles(srcs [graphics.ShaderImageCount]*Image, vertices [
 		swf, shf := float32(sw), float32(sh)
 		n := len(vertices)
 		for i := 0; i < n; i += graphics.VertexFloatCount {
-			vertices[i] = vertices[i] + dx
-			vertices[i+1] = vertices[i+1] + dy
+			vertices[i] += dx
+			vertices[i+1] += dy
 			vertices[i+2] = (vertices[i+2] + oxf) / swf
 			vertices[i+3] = (vertices[i+3] + oyf) / shf
 		}
@@ -473,8 +473,8 @@ func (i *Image) drawTriangles(srcs [graphics.ShaderImageCount]*Image, vertices [
 	} else {
 		n := len(vertices)
 		for i := 0; i < n; i += graphics.VertexFloatCount {
-			vertices[i] = vertices[i] + dx
-			vertices[i+1] = vertices[i+1] + dy
+			vertices[i] += dx
+			vertices[i+1] += dy
 		}
 	}
 
diff --git a/internal/graphicscommand/command.go b/internal/graphicscommand/command.go
index 8ea0b1822..d00c6e370 100644
--- a/internal/graphicscommand/command.go
+++ b/internal/graphicscommand/command.go
@@ -590,11 +590,12 @@ func (q *commandQueue) prependPreservedUniforms(uniforms []uint32, shader *Shade
 
 	// Set the source texture sizes.
 	for i, src := range srcs {
-		if src != nil {
-			w, h := src.InternalSize()
-			uniforms[idx+2*i] = math.Float32bits(float32(w))
-			uniforms[idx+2*i+1] = math.Float32bits(float32(h))
+		if src == nil {
+			continue
 		}
+		w, h := src.InternalSize()
+		uniforms[idx+2*i] = math.Float32bits(float32(w))
+		uniforms[idx+2*i+1] = math.Float32bits(float32(h))
 	}
 	idx += len(srcs) * 2