Example usage for android.view Surface isValid

Introduction

In this page you can find the example usage for android.view Surface isValid.

Prototype

public boolean isValid() 

Source Link

Document

Returns true if this object holds a valid surface.

Usage

From source file:com.fishstix.dosboxfree.DBGLSurfaceView.java

private void canvasDraw(Bitmap bitmap, int src_width, int src_height, int startLine, int endLine) {
    SurfaceHolder surfaceHolder = getHolder();
    Surface surface = surfaceHolder.getSurface();
    Canvas canvas = null;/*from  w w  w.  ja  v  a  2  s . c  o m*/

    try {
        synchronized (surfaceHolder) {

            boolean isDirty = false;

            if (mDirtyCount < 3) {
                mDirtyCount++;
                isDirty = true;
                startLine = 0;
                endLine = src_height;
            }

            if (mScale) {
                mDstRect.set(0, 0, mRenderer.width, mRenderer.height);
                mSrcRect.set(0, 0, src_width, src_height);
                mDstRect.offset(mRenderer.x, mRenderer.y);

                mDirtyRect.set(0, startLine * mRenderer.height / src_height, mRenderer.width,
                        endLine * mRenderer.height / src_height + 1);

                //locnet, 2011-04-21, a strip on right side not updated
                mDirtyRect.offset(mRenderer.x, mRenderer.y);
            } else {
                //L,T,R,B 
                mSrcRect.set(-mScroll_x, Math.max(-mScroll_y, startLine), mRenderer.mCropWorkspace[2],
                        Math.min(Math.min(getHeight() - mScroll_y, src_height), endLine));
                mDstRect.set(0, mSrcRect.top + mScroll_y, mSrcRect.width(),
                        mSrcRect.top + mScroll_y + mSrcRect.height());
                if (isLandscape) {
                    mDstRect.offset((getWidth() - mSrcRect.width()) / 2, 0);
                } else {
                    mDstRect.offset((getWidth() - mSrcRect.width()) / 2, mActionBarHeight);
                }

                mDirtyRect.set(mDstRect);
            }
            if (surface != null && surface.isValid()) {
                if (isDirty) {
                    canvas = surfaceHolder.lockCanvas(null);
                    canvas.drawColor(0xff000000);
                } else {
                    canvas = surfaceHolder.lockCanvas(mDirtyRect);
                }

                if (mScale) {
                    canvas.drawBitmap(bitmap, mSrcRect, mDstRect,
                            (mParent.mPrefScaleFilterOn) ? mBitmapPaint : null);
                } else {
                    canvas.drawBitmap(bitmap, mSrcRect, mDstRect, null);
                }

            }
        }
    } finally {
        if (canvas != null && surface != null && surface.isValid()) {
            surfaceHolder.unlockCanvasAndPost(canvas);
        }
    }

    surfaceHolder = null;
}

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