Android Shader渲染器：BitmapShader图片渲染

public class BitmapShader extends Shader

BitmapShader, Shader家族的专门处理图片渲染的

构造方法：

public BitmapShader(Bitmap bitmap, TileMode tileX, TileMode tileY)

bitmap：原图

tile直译为瓷砖，瓦片。这里的TileMode 可看成是铺图的模式。

tileX, tileY：x/y 方向铺图的模式

public enum TileMode {

    CLAMP   (0),

    REPEAT  (1),

    MIRROR  (2);

    TileMode(int nativeInt) {

        this.nativeInt = nativeInt;

    }

    final int nativeInt;

}

CLAMP：假设超出原始bounds(即原图的边界)，则反复边缘上的color

REPEAT：反复bitmap

MIRROR：反复bitmap。与REPEAT不同的时，它是镜像反复，即：反向反复

例：

public class BitmapShaderView extends View {

    private BitmapShader mBitmapShader;

    private ShapeDrawable mShapeDrawable;

    public BitmapShaderView(Context context, Bitmap bitmap) {

        super(context);

        mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        mShapeDrawable = new ShapeDrawable(new OvalShape());

        mShapeDrawable.getPaint().setShader(mBitmapShader);

//        mShapeDrawable.setBounds(0, 0, bitmap.getWidth(), bitmap.getHeight()); //原图大小

        mShapeDrawable.setBounds(0, 0, bitmap.getWidth() * 2, bitmap.getHeight() * 2);

    }

    @Override

    protected void onDraw(Canvas canvas) {

        super.onDraw(canvas);

        canvas.drawColor(Color.CYAN);

        mShapeDrawable.draw(canvas);

    }

}

在Activity中，setContentView(new BitmapShaderView(context, bitmap));

原图效果图

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" width="290" height="193" alt=""> Android Shader渲染器：BitmapShader图片渲染-LMLPHP x和y
边缘反复

改：mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.MIRROR, Shader.TileMode.REPEAT);

效果

Android Shader渲染器：BitmapShader图片渲染-LMLPHP x方向镜像反复；y方向反复

改：mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.REPEAT, Shader.TileMode.MIRROR)；

效果：

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