1 files changed, 50 insertions, 0 deletions
diff --git a/packages/frontend/src/utility/image-compositor-functions/fill.glsl b/packages/frontend/src/utility/image-compositor-functions/fill.glsl
new file mode 100644
index 0000000000..f04dc5545a
--- /dev/null
+++ b/packages/frontend/src/utility/image-compositor-functions/fill.glsl
@@ -0,0 +1,50 @@
+#version 300 es
+precision mediump float;
+
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+const float PI = 3.141592653589793;
+const float TWO_PI = 6.283185307179586;
+const float HALF_PI = 1.5707963267948966;
+
+in vec2 in_uv;
+uniform sampler2D in_texture;
+uniform vec2 in_resolution;
+uniform vec2 u_offset;
+uniform vec2 u_scale;
+uniform bool u_ellipse;
+uniform float u_angle;
+uniform vec3 u_color;
+uniform float u_opacity;
+out vec4 out_color;
+
+void main() {
+	vec4 in_color = texture(in_texture, in_uv);
+	//float x_ratio = max(in_resolution.x / in_resolution.y, 1.0);
+	//float y_ratio = max(in_resolution.y / in_resolution.x, 1.0);
+
+	float angle = -(u_angle * PI);
+	vec2 centeredUv = in_uv - vec2(0.5, 0.5) - u_offset;
+	vec2 rotatedUV = vec2(
+		centeredUv.x * cos(angle) - centeredUv.y * sin(angle),
+		centeredUv.x * sin(angle) + centeredUv.y * cos(angle)
+	) + u_offset;
+
+	bool isInside = false;
+	if (u_ellipse) {
+		vec2 norm = (rotatedUV - u_offset) / u_scale;
+		isInside = dot(norm, norm) <= 1.0;
+	} else {
+		isInside = rotatedUV.x > u_offset.x - u_scale.x && rotatedUV.x < u_offset.x + u_scale.x && rotatedUV.y > u_offset.y - u_scale.y && rotatedUV.y < u_offset.y + u_scale.y;
+	}
+
+	out_color = isInside ? vec4(
+		mix(in_color.r, u_color.r, u_opacity),
+		mix(in_color.g, u_color.g, u_opacity),
+		mix(in_color.b, u_color.b, u_opacity),
+		in_color.a
+	) : in_color;
+}