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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Shader;
import android.os.Build;
public class CanvasDelegate {
Paint mPaint;
PorterDuffXfermode mMode;
DrawManager mDrawManager;
// DrawManager would do a default draw of the background.
public static interface DrawManager {
public void defaultDraw(Canvas cavas);
}
public CanvasDelegate(DrawManager drawManager, Mode mode) {
mDrawManager = drawManager;
// DST_IN masks, DST_OUT clips.
mMode = new PorterDuffXfermode(mode);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setColor(0xFFFF0000);
mPaint.setStrokeWidth(0.0f);
}
public void draw(Canvas canvas, Path path, int width, int height) {
// Save the canvas. All PorterDuff operations should be done in a offscreen bitmap.
int count = canvas.saveLayer(0, 0, width, height, null,
Canvas.MATRIX_SAVE_FLAG |
Canvas.CLIP_SAVE_FLAG |
Canvas.HAS_ALPHA_LAYER_SAVE_FLAG |
Canvas.FULL_COLOR_LAYER_SAVE_FLAG |
Canvas.CLIP_TO_LAYER_SAVE_FLAG);
// Do a default draw.
mDrawManager.defaultDraw(canvas);
if (path != null && !path.isEmpty()) {
// ICS added double-buffering, which made it easier for drawing the Path directly over the DST.
// In pre-ICS, drawPath() doesn't seem to use ARGB_8888 mode for performance, hence transparency is not preserved.
if (Build.VERSION.SDK_INT >= 14) {
mPaint.setXfermode(mMode);
canvas.drawPath(path, mPaint);
} else {
// Allocate a bitmap and draw the masking/clipping path.
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
(new Canvas(bitmap)).drawPath(path, mPaint);
mPaint.setXfermode(mMode);
canvas.drawBitmap(bitmap, 0, 0, mPaint);
bitmap.recycle();
mPaint.setXfermode(null);
}
}
// Restore the canvas.
canvas.restoreToCount(count);
}
public void setShader(Shader shader) {
mPaint.setShader(shader);
}
}
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