implement ColorFilter in GskCanvas

This is needed to make icons follow night mode setting

src/api-impl-jni/generated_headers/android_graphics_GskCanvas.h

@@ -10,10 +10,10 @@ extern "C" {
 /*
  * Class:     android_graphics_GskCanvas
  * Method:    native_drawBitmap
- * Signature: (JJIIII)V
+ * Signature: (JJIIIII)V
  */
 JNIEXPORT void JNICALL Java_android_graphics_GskCanvas_native_1drawBitmap
-  (JNIEnv *, jobject, jlong, jlong, jint, jint, jint, jint);
+  (JNIEnv *, jobject, jlong, jlong, jint, jint, jint, jint, jint);
 
 #ifdef __cplusplus
 }

src/api-impl-jni/graphics/android_graphics_GskCanvas.c

@@ -6,11 +6,25 @@
 
 #include "../generated_headers/android_graphics_GskCanvas.h"
 
-JNIEXPORT void JNICALL Java_android_graphics_GskCanvas_native_1drawBitmap(JNIEnv *env, jclass this_class, jlong snapshot_ptr, jlong pixbuf_ptr, jint x, jint y, jint width, jint height)
+JNIEXPORT void JNICALL Java_android_graphics_GskCanvas_native_1drawBitmap(JNIEnv *env, jclass this_class, jlong snapshot_ptr, jlong pixbuf_ptr, jint x, jint y, jint width, jint height, jint color)
 {
 	GdkSnapshot *snapshot = (GdkSnapshot *)_PTR(snapshot_ptr);
 	GdkPixbuf *pixbuf = (GdkPixbuf *)_PTR(pixbuf_ptr);
 	GdkTexture *texture = gdk_texture_new_for_pixbuf(pixbuf);
+	if (color) {  // use only alpha from pixbuf, color is fixed
+		graphene_matrix_t color_matrix;
+		graphene_vec4_t color_offset;
+		graphene_matrix_init_from_float(&color_matrix, (float[]){
+			0, 0, 0, 0,
+			0, 0, 0, 0,
+			0, 0, 0, 0,
+			0, 0, 0, 1,
+		});
+		graphene_vec4_init(&color_offset, ((color >> 16) & 0xFF) / 255.f, ((color >> 8) & 0xFF) / 255.f, ((color >> 0) & 0xFF) / 255.f, 0);
+		gtk_snapshot_push_color_matrix(snapshot, &color_matrix, &color_offset);
+	}
 	gtk_snapshot_append_texture(snapshot, texture, &GRAPHENE_RECT_INIT(x, y, width, height));
+	if (color)
+		gtk_snapshot_pop(snapshot);
 	g_object_unref(texture);
 }

src/api-impl/android/graphics/GskCanvas.java

@@ -35,7 +35,11 @@ public class GskCanvas extends Canvas {
 
 	@Override
 	public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint) {
-		native_drawBitmap(snapshot, bitmap.pixbuf, dst.left, dst.top, dst.width(), dst.height());
+		int color = 0;
+		if (paint != null && paint.colorFilter instanceof PorterDuffColorFilter) {
+			color = ((PorterDuffColorFilter) paint.colorFilter).getColor();
+		}
+		native_drawBitmap(snapshot, bitmap.pixbuf, dst.left, dst.top, dst.width(), dst.height(), color);
 	}
 
 	@Override
@@ -70,5 +74,5 @@ public class GskCanvas extends Canvas {
 		drawBitmap(bitmap, src, dst, paint);
 	}
 
-	protected native void native_drawBitmap(long snapshot, long pixbuf, int x, int y, int width, int height);
+	protected native void native_drawBitmap(long snapshot, long pixbuf, int x, int y, int width, int height, int color);
 }

src/api-impl/android/graphics/Paint.java

@@ -4,6 +4,7 @@ public class Paint {
 	public long skia_paint = 0;
 	private Typeface typeface = null;
 	public long skia_font = 0;
+	ColorFilter colorFilter = null;
 
 	public Paint() {
 		skia_paint = native_constructor();
@@ -64,6 +65,11 @@ public class Paint {
 	}
 	public float measureText(CharSequence text, int start, int end) { return 10; }
 
+	public ColorFilter setColorFilter(ColorFilter colorFilter) {
+		this.colorFilter = colorFilter;
+		return colorFilter;
+	}
+
 	public Shader setShader(Shader shader) { return shader; } 
 
 	public enum Style {

src/api-impl/android/graphics/PorterDuff.java

@@ -92,6 +92,10 @@ public class PorterDuff {
 		ADD(16),
 		OVERLAY(17);
 
-		Mode(int nativeInt) {}
+		public int nativeInt;
+
+		Mode(int nativeInt) {
+			this.nativeInt = nativeInt;
+		}
 	}
 }