C++ SkPictureRecorder::DEPRECATED_beginRecording方法代码示例

// construct the pattern removed by the SkPictureRecord::remove_save_layer1
// optimization, i.e.:
//   SAVE_LAYER
//       DRAW_BITMAP|DRAW_BITMAP_MATRIX|DRAW_BITMAP_NINE|DRAW_BITMAP_RECT_TO_RECT
//   RESTORE
//
// saveLayerHasPaint - control if the saveLayer has a paint (the optimization
//                     takes a different path if this is false)
// dbmr2rHasPaint    - control if the dbmr2r has a paint (the optimization
//                     takes a different path if this is false)
// colorsMatch       - control if the saveLayer and dbmr2r paint colors
//                     match (the optimization will fail if they do not)
static SkPicture* create_save_layer_opt_1(SkTDArray<DrawType>* preOptPattern,
                                          SkTDArray<DrawType>* postOptPattern,
                                          const SkBitmap& checkerBoard,
                                          bool saveLayerHasPaint,
                                          bool dbmr2rHasPaint,
                                          bool colorsMatch)  {
    // Create the pattern that should trigger the optimization
    preOptPattern->setCount(5);
    (*preOptPattern)[0] = SAVE;
    (*preOptPattern)[1] = SAVE_LAYER;
    (*preOptPattern)[2] = DRAW_BITMAP_RECT_TO_RECT;
    (*preOptPattern)[3] = RESTORE;
    (*preOptPattern)[4] = RESTORE;

    if (colorsMatch) {
        // Create the pattern that should appear after the optimization
        postOptPattern->setCount(5);
        (*postOptPattern)[0] = SAVE; // extra save/restore added by extra draw
        (*postOptPattern)[1] = SAVE;
        (*postOptPattern)[2] = DRAW_BITMAP_RECT_TO_RECT;
        (*postOptPattern)[3] = RESTORE;
        (*postOptPattern)[4] = RESTORE;
    } else {
        // Create the pattern that appears if the optimization doesn't fire
        postOptPattern->setCount(7);
        (*postOptPattern)[0] = SAVE; // extra save/restore added by extra draw
        (*postOptPattern)[1] = SAVE;
        (*postOptPattern)[2] = SAVE_LAYER;
        (*postOptPattern)[3] = DRAW_BITMAP_RECT_TO_RECT;
        (*postOptPattern)[4] = RESTORE;
        (*postOptPattern)[5] = RESTORE;
        (*postOptPattern)[6] = RESTORE;
    }

    SkPictureRecorder recorder;

    SkCanvas* canvas = recorder.DEPRECATED_beginRecording(100, 100, NULL, 0);
    // have to disable the optimizations while generating the picture
    recorder.internalOnly_EnableOpts(false);

    SkPaint saveLayerPaint;
    saveLayerPaint.setColor(0xCC000000);

    // saveLayer's 'bounds' parameter must be NULL for this optimization
    if (saveLayerHasPaint) {
        canvas->saveLayer(NULL, &saveLayerPaint);
    } else {
        canvas->saveLayer(NULL, NULL);
    }

    SkRect rect = { 10, 10, 90, 90 };

    // The dbmr2r's paint must be opaque
    SkPaint dbmr2rPaint;
    if (colorsMatch) {
        dbmr2rPaint.setColor(0xFF000000);
    } else {
        dbmr2rPaint.setColor(0xFFFF0000);
    }

    if (dbmr2rHasPaint) {
        canvas->drawBitmapRectToRect(checkerBoard, NULL, rect, &dbmr2rPaint);
    } else {
        canvas->drawBitmapRectToRect(checkerBoard, NULL, rect, NULL);
    }
    canvas->restore();

    return recorder.endRecording();
}

    virtual void onDraw(SkCanvas* canvas) {

        PFCreateOpt gOpts[] = {
            create_save_layer_opt_1_v1,
            create_save_layer_opt_1_v2,
            create_save_layer_opt_1_v3,
            create_save_layer_opt_1_v4,
            create_save_layer_opt_2_v1,
            create_save_layer_opt_2_v2,
            create_save_layer_opt_2_v3,
            create_save_layer_opt_2_v4,
        };

        SkTDArray<DrawType> prePattern, postPattern;
        SkScalar xPos = 0, yPos = 0;

        for (size_t i = 0; i < SK_ARRAY_COUNT(gOpts); ++i) {
            SkAutoTUnref<SkPicture> pre((*gOpts[i])(&prePattern, &postPattern, fCheckerboard));

            if (!(check_pattern(*pre, prePattern))) {
                WARN("Pre optimization pattern mismatch");
                SkASSERT(0);
            }

            canvas->save();
                canvas->translate(xPos, yPos);
                pre->draw(canvas);
                xPos += pre->cullRect().width();
            canvas->restore();

            // re-render the 'pre' picture and thus 'apply' the optimization
            SkPictureRecorder recorder;

            SkCanvas* recordCanvas =
                recorder.DEPRECATED_beginRecording(pre->cullRect().width(), 
                                                   pre->cullRect().height(), 
                                                   NULL, 0);

            pre->draw(recordCanvas);

            SkAutoTUnref<SkPicture> post(recorder.endRecording());

            if (!(check_pattern(*post, postPattern))) {
                WARN("Post optimization pattern mismatch");
                SkASSERT(0);
            }

            canvas->save();
                canvas->translate(xPos, yPos);
                post->draw(canvas);
                xPos += post->cullRect().width();
            canvas->restore();

            if (xPos >= kWidth) {
                // start a new line
                xPos = 0;
                yPos += post->cullRect().height();
            }

            // TODO: we could also render the pre and post pictures to bitmaps
            // and manually compare them in this method
        }
    }