Method drawPixels

examples/scenes/src/BitmapScene.java:121–160

(Canvas canvas, IRect target, IRect screen, float dpi)

    }

    public void drawPixels(Canvas canvas, IRect target, IRect screen, float dpi) {
        target = target.intersect(screen);
        if (target == null) return;

        if (target.getWidth() <= 20 || target.getHeight() <= 20)
            return;
        IRect inner = IRect.makeXYWH(target.getLeft() + 10, target.getTop() + 10, target.getWidth() - 20, target.getHeight() - 20);
        if (inner == null) return;

        try (var bitmap = new Bitmap();) {
            var srcInfo = ImageInfo.makeS32((int) (target.getWidth() * dpi), (int) (target.getHeight() * dpi), ColorAlphaType.OPAQUE);
            bitmap.allocPixelsFlags(srcInfo, true);
            if (canvas.readPixels(bitmap, (int) (target.getLeft() * dpi), (int) (target.getTop() * dpi))) {
                var dstInfo = new ImageInfo((int) (inner.getWidth() * dpi), (int) (inner.getHeight() * dpi), ColorType.ARGB_4444, ColorAlphaType.UNPREMUL);
                long rowBytes = dstInfo.getMinRowBytes();
                byte[] pixels = bitmap.readPixels(dstInfo, rowBytes, (int) (10 * dpi), (int) (10 * dpi));
                int bpp = dstInfo.getBytesPerPixel();

                for (int i = 0; i < pixels.length / bpp / 2; ++i) {
                    for (int j = 0; j < bpp; ++j) {
                        int i1 = i * bpp + j;
                        int i2 = (pixels.length / bpp - i - 1) * bpp + j;
                        byte b = pixels[i1];
                        pixels[i1] = pixels[i2];
                        pixels[i2] = b;
                    }
                }

                bitmap.installPixels(dstInfo, pixels, rowBytes);
                bitmap.notifyPixelsChanged();
                try (var image = Image.makeRasterFromBitmap(bitmap.setImmutable());) {
                    canvas.drawImageRect(image, inner.toRect());
                }
            }
        }

        try(var stroke = new Paint().setColor(0xFFE5E5E5).setMode(PaintMode.STROKE).setStrokeWidth(1);) {
            canvas.drawRect(target.toRect(), stroke);
        }
    }

    public void drawSubset(Canvas canvas, IRect target, IRect screen, float dpi) {
        try (var src = new Bitmap();