implement Bitmap.compress()

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

@@ -79,6 +79,14 @@ JNIEXPORT void JNICALL Java_android_graphics_Bitmap_native_1get_1pixels
 JNIEXPORT void JNICALL Java_android_graphics_Bitmap_native_1copy_1to_1buffer
   (JNIEnv *, jclass, jlong, jobject, jint, jint);
 
+/*
+ * Class:     android_graphics_Bitmap
+ * Method:    native_save_to_png
+ * Signature: (J)[B
+ */
+JNIEXPORT jbyteArray JNICALL Java_android_graphics_Bitmap_native_1save_1to_1png
+  (JNIEnv *, jclass, jlong);
+
 #ifdef __cplusplus
 }
 #endif

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

@@ -113,3 +113,15 @@ JNIEXPORT void JNICALL Java_android_graphics_Bitmap_native_1copy_1to_1buffer(JNI
 	release_nio_buffer(env, array_ref, array);
 	gdk_texture_downloader_free(downloader);
 }
+
+JNIEXPORT jbyteArray JNICALL Java_android_graphics_Bitmap_native_1save_1to_1png(JNIEnv *env, jclass class, jlong texture_ptr)
+{
+	GdkTexture *texture = GDK_TEXTURE(_PTR(texture_ptr));
+	GBytes *bytes = gdk_texture_save_to_png_bytes(texture);
+	jbyteArray result = (*env)->NewByteArray(env, g_bytes_get_size(bytes));
+	gsize size;
+	gconstpointer data = g_bytes_get_data(bytes, &size);
+	(*env)->SetByteArrayRegion(env, result, 0, size, data);
+	g_bytes_unref(bytes);
+	return result;
+}

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

@@ -1,5 +1,7 @@
 package android.graphics;
 
+import java.io.IOException;
+import java.io.OutputStream;
 import java.nio.Buffer;
 
 import android.util.DisplayMetrics;
@@ -27,6 +29,11 @@ public final class Bitmap {
 		}
 	}
 
+	public enum CompressFormat {
+		JPEG,
+		PNG,
+	}
+
 	private int width;
 	private int height;
 	private int stride;
@@ -190,6 +197,16 @@ public final class Bitmap {
 		return true;
 	}
 
+	public boolean compress(Bitmap.CompressFormat format, int quality, OutputStream stream) throws IOException {
+		if (format == CompressFormat.PNG) {
+			stream.write(native_save_to_png(getTexture()));
+			return true;
+		} else {
+			stream.write(("fixme Bitmap.compress " + format.name()).getBytes());
+			return false;
+		}
+	}
+
 	@SuppressWarnings("deprecation")
 	@Override
 	protected void finalize() throws Throwable {
@@ -209,4 +226,5 @@ public final class Bitmap {
 	private static native long native_ref_texture(long texture);
 	private static native void native_get_pixels(long texture, int[] pixels, int offset, int stride, int x, int y, int width, int height);
 	private static native void native_copy_to_buffer(long texture, Buffer buffer, int memory_format, int stride);
+	private static native byte[] native_save_to_png(long texture);
 }