Paint: implement textAlign and text bounds

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

@@ -161,6 +161,22 @@ JNIEXPORT jfloat JNICALL Java_android_graphics_Paint_native_1get_1text_1size
 JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1color_1filter
   (JNIEnv *, jclass, jlong, jint, jint);
 
+/*
+ * Class:     android_graphics_Paint
+ * Method:    native_get_text_bounds
+ * Signature: (JLjava/lang/String;Landroid/graphics/Rect;)V
+ */
+JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1get_1text_1bounds
+  (JNIEnv *, jclass, jlong, jstring, jobject);
+
+/*
+ * Class:     android_graphics_Paint
+ * Method:    native_set_text_align
+ * Signature: (JI)V
+ */
+JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1text_1align
+  (JNIEnv *, jclass, jlong, jint);
+
 #ifdef __cplusplus
 }
 #endif

src/api-impl-jni/graphics/AndroidPaint.h

@@ -1,3 +1,4 @@
+#include "pango/pango-layout.h"
 #include <gdk/gdk.h>
 #include <gsk/gsk.h>
 #include <pango/pango.h>
@@ -6,6 +7,7 @@ struct AndroidPaint {
 	GdkRGBA color;
 	GskStroke *gsk_stroke;
 	PangoFontDescription *font;
+	PangoAlignment alignment;
 	graphene_matrix_t color_matrix;
 	graphene_vec4_t color_offset;
 	bool is_fill:1;

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

@@ -102,6 +102,13 @@ JNIEXPORT void JNICALL Java_android_graphics_GskCanvas_native_1drawText(JNIEnv *
 	const char *str = (*env)->GetStringUTFChars(env, text, NULL);
 	pango_layout_set_text(layout, str, -1);
 	(*env)->ReleaseStringUTFChars(env, text, str);
+	PangoRectangle rect;
+	pango_layout_get_pixel_extents(layout, NULL, &rect);
+	y -= rect.height;
+	if (paint->alignment == PANGO_ALIGN_CENTER)
+		x -= rect.width / 2.f;
+	else if (paint->alignment == PANGO_ALIGN_RIGHT)
+		x -= rect.width;
 	gtk_snapshot_translate(snapshot, &GRAPHENE_POINT_INIT(x, y));
 	gtk_snapshot_append_layout(snapshot, layout, &paint->color);
 	gtk_snapshot_translate(snapshot, &GRAPHENE_POINT_INIT(-x, -y));

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

@@ -1,5 +1,6 @@
 #include <glib.h>
 #include <gsk/gsk.h>
+#include <gtk/gtk.h>
 
 #include "AndroidPaint.h"
 #include "../defines.h"
@@ -131,3 +132,28 @@ JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1color_1filter(JN
 	graphene_vec4_init(&paint->color_offset, ((color >> 16) & 0xFF) / 255.f, ((color >> 8) & 0xFF) / 255.f, ((color >> 0) & 0xFF) / 255.f, 0);
 	paint->use_color_filter = mode != -1;
 }
+
+extern GtkWidget *window;
+
+JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1get_1text_1bounds(JNIEnv *env, jclass clazz, jlong paint_ptr, jstring text_ptr, jobject bounds)
+{
+	struct AndroidPaint *paint = _PTR(paint_ptr);
+	PangoLayout *layout = pango_layout_new(gtk_widget_get_pango_context(window));
+	pango_layout_set_font_description(layout, paint->font);
+	const char *str = (*env)->GetStringUTFChars(env, text_ptr, NULL);
+	pango_layout_set_text(layout, str, -1);
+	(*env)->ReleaseStringUTFChars(env, text_ptr, str);
+	PangoRectangle rect;
+	pango_layout_get_pixel_extents(layout, NULL, &rect);
+	_SET_INT_FIELD(bounds, "left", rect.x);
+	_SET_INT_FIELD(bounds, "top", rect.y);
+	_SET_INT_FIELD(bounds, "right", rect.x + rect.width);
+	_SET_INT_FIELD(bounds, "bottom", rect.y + rect.height);
+	g_object_unref(layout);
+}
+
+JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1text_1align(JNIEnv *env, jclass clazz, jlong paint_ptr, jint align)
+{
+	struct AndroidPaint *paint = _PTR(paint_ptr);
+	paint->alignment = align;
+}

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

@@ -60,11 +60,18 @@ public class Paint {
 	public Typeface setTypeface(Typeface typeface) {
 		return typeface;
 	}
-	public void getTextBounds(String text, int start, int end, Rect bounds) {}
-	public void getTextBounds(char[] text, int index, int count, Rect bounds) {}
+	public void getTextBounds(String text, int start, int end, Rect bounds) {
+		if (end > text.length())
+			end = text.length();
+		native_get_text_bounds(paint, text.substring(start, end), bounds);
+	}
+	public void getTextBounds(char[] text, int index, int count, Rect bounds) {
+		native_get_text_bounds(paint, new String(text, index, count), bounds);
+	}
 	public int getTextWidths(String text, int start, int end, float[] widths) {
-		// TODO fix it
-		return 0;
+		Rect bounds = new Rect();
+		native_get_text_bounds(paint, text.substring(start, end), bounds);
+		return bounds.width();
 	}
 	public void setFilterBitmap(boolean filter) {}
 
@@ -78,7 +85,7 @@ public class Paint {
 	}
 
 	public float ascent() {
-		return 10;
+		return -getTextSize();
 	}
 
 	public float measureText(char[] text, int index, int count) { return 10; }
@@ -253,8 +260,8 @@ public class Paint {
 	}
 
 	public enum Align {
-		CENTER,
 		LEFT,
+		CENTER,
 		RIGHT,
 	}
 
@@ -270,7 +277,10 @@ public class Paint {
 		return new Typeface();
 	}
 
-	public void setTextAlign(Align align) {}
+	public void setTextAlign(Align align) {
+		this.align = align;
+		native_set_text_align(paint, align.ordinal());
+	}
 
 	public Shader getShader() {
 		return shader;
@@ -343,4 +353,6 @@ public class Paint {
 	private static native void native_set_text_size(long paint, float size);
 	private static native float native_get_text_size(long paint);
 	private static native void native_set_color_filter(long paint, int mode, int color);
+	private static native void native_get_text_bounds(long paint, String text, Rect bounds);
+	private static native void native_set_text_align(long paint, int align);
 }