C++ SkTLazy::getMaybeNull方法代码示例

GrTexture* SkPictureImageGenerator::onGenerateTexture(GrContext* ctx, SkImageUsageType usage,
                                                      const SkIRect* subset) {
    const SkImageInfo& info = this->getInfo();
    SkImageInfo surfaceInfo = subset ? info.makeWH(subset->width(), subset->height()) : info;

    //
    // TODO: respect the usage, by possibly creating a different (pow2) surface
    //
    SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(ctx,
                                                               SkSurface::kYes_Budgeted,
                                                               surfaceInfo));
    if (!surface.get()) {
        return nullptr;
    }

    SkMatrix matrix = fMatrix;
    if (subset) {
        matrix.postTranslate(-subset->x(), -subset->y());
    }
    surface->getCanvas()->clear(0); // does NewRenderTarget promise to do this for us?
    surface->getCanvas()->drawPicture(fPicture, &matrix, fPaint.getMaybeNull());
    SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
    if (!image.get()) {
        return nullptr;
    }
    return SkSafeRef(image->getTexture());
}

int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom,
        int alpha, SaveFlags::Flags flags) {
    SkTLazy<SkPaint> alphaPaint;
    if (static_cast<unsigned>(alpha) < 0xFF) {
        alphaPaint.init()->setAlpha(alpha);
    }

    return this->saveLayer(left, top, right, bottom, alphaPaint.getMaybeNull(),
                           flags);
}

bool SkPictureImageGenerator::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
                                          SkPMColor ctable[], int* ctableCount) {
    if (info != getInfo() || ctable || ctableCount) {
        return false;
    }

    SkBitmap bitmap;
    if (!bitmap.installPixels(info, pixels, rowBytes)) {
        return false;
    }

    bitmap.eraseColor(SK_ColorTRANSPARENT);
    SkCanvas canvas(bitmap, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
    canvas.drawPicture(fPicture, &fMatrix, fPaint.getMaybeNull());

    return true;
}

bool SkPictureImageGenerator::onGenerateScaledPixels(const SkISize& scaledSize,
                                                     const SkIPoint& scaledOrigin,
                                                     const SkPixmap& scaledPixels) {
    int w = scaledSize.width();
    int h = scaledSize.height();

    const SkScalar scaleX = SkIntToScalar(w) / this->getInfo().width();
    const SkScalar scaleY = SkIntToScalar(h) / this->getInfo().height();
    SkMatrix matrix = SkMatrix::MakeScale(scaleX, scaleY);
    matrix.postTranslate(-SkIntToScalar(scaledOrigin.x()), -SkIntToScalar(scaledOrigin.y()));

    SkBitmap bitmap;
    if (!bitmap.installPixels(scaledPixels)) {
        return false;
    }

    bitmap.eraseColor(SK_ColorTRANSPARENT);
    SkCanvas canvas(bitmap, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
    matrix.preConcat(fMatrix);
    canvas.drawPicture(fPicture, &matrix, fPaint.getMaybeNull());
    return true;
}

void GrDrawTarget::onDrawRect(const SkRect& rect,
                              const SkMatrix* matrix,
                              const SkRect* localRect,
                              const SkMatrix* localMatrix) {

    GrDrawState::AutoViewMatrixRestore avmr;
    if (NULL != matrix) {
        avmr.set(this->drawState(), *matrix);
    }

    set_vertex_attributes(this->drawState(), NULL != localRect);

    AutoReleaseGeometry geo(this, 4, 0);
    if (!geo.succeeded()) {
        GrPrintf("Failed to get space for vertices!\n");
        return;
    }

    size_t vsize = this->drawState()->getVertexSize();
    geo.positions()->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vsize);
    if (NULL != localRect) {
        GrPoint* coords = GrTCast<GrPoint*>(GrTCast<intptr_t>(geo.vertices()) +
                                            sizeof(GrPoint));
        coords->setRectFan(localRect->fLeft, localRect->fTop,
                           localRect->fRight, localRect->fBottom,
                           vsize);
        if (NULL != localMatrix) {
            localMatrix->mapPointsWithStride(coords, vsize, 4);
        }
    }
    SkTLazy<SkRect> bounds;
    if (this->getDrawState().willEffectReadDstColor()) {
        bounds.init();
        this->getDrawState().getViewMatrix().mapRect(bounds.get(), rect);
    }

    this->drawNonIndexed(kTriangleFan_GrPrimitiveType, 0, 4, bounds.getMaybeNull());
}

DEF_TEST(CanvasState_test_complex_layers, reporter) {
    const int WIDTH = 400;
    const int HEIGHT = 400;
    const int SPACER = 10;

    SkRect rect = SkRect::MakeXYWH(SkIntToScalar(SPACER), SkIntToScalar(SPACER),
                                   SkIntToScalar(WIDTH-(2*SPACER)),
                                   SkIntToScalar((HEIGHT-(2*SPACER)) / 7));

    const SkColorType colorTypes[] = {
        kRGB_565_SkColorType, kN32_SkColorType
    };

    const int layerAlpha[] = { 255, 255, 0 };
    const SkCanvas::SaveLayerFlags flags[] = {
        static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
        0,
        static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
    };
    REPORTER_ASSERT(reporter, sizeof(layerAlpha) == sizeof(flags));

    bool (*drawFn)(SkCanvasState* state, float l, float t,
                   float r, float b, int32_t s);

    OpenLibResult openLibResult(reporter);
    if (openLibResult.handle() != nullptr) {
        *(void**) (&drawFn) = dlsym(openLibResult.handle(),
                                    "complex_layers_draw_from_canvas_state");
    } else {
        drawFn = complex_layers_draw_from_canvas_state;
    }

    REPORTER_ASSERT(reporter, drawFn);
    if (!drawFn) {
        return;
    }

    for (size_t i = 0; i < SK_ARRAY_COUNT(colorTypes); ++i) {
        SkBitmap bitmaps[2];
        for (int j = 0; j < 2; ++j) {
            bitmaps[j].allocPixels(SkImageInfo::Make(WIDTH, HEIGHT,
                                                     colorTypes[i],
                                                     kPremul_SkAlphaType));

            SkCanvas canvas(bitmaps[j]);

            canvas.drawColor(SK_ColorRED);

            for (size_t k = 0; k < SK_ARRAY_COUNT(layerAlpha); ++k) {
                SkTLazy<SkPaint> paint;
                if (layerAlpha[k] != 0xFF) {
                    paint.init()->setAlpha(layerAlpha[k]);
                }

                // draw a rect within the layer's bounds and again outside the layer's bounds
                canvas.saveLayer(SkCanvas::SaveLayerRec(&rect, paint.getMaybeNull(), flags[k]));

                if (j) {
                    // Capture from the first Skia.
                    SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
                    REPORTER_ASSERT(reporter, state);

                    // And draw to it in the second Skia.
                    bool success = complex_layers_draw_from_canvas_state(state,
                            rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, SPACER);
                    REPORTER_ASSERT(reporter, success);

                    // And release it in the *first* Skia.
                    SkCanvasStateUtils::ReleaseCanvasState(state);
                } else {
                    // Draw in the first Skia.
                    complex_layers_draw(&canvas, rect.fLeft, rect.fTop,
                                        rect.fRight, rect.fBottom, SPACER);
                }

                canvas.restore();

                // translate the canvas for the next iteration
                canvas.translate(0, 2*(rect.height() + SPACER));
            }
        }

        // now we memcmp the two bitmaps
        REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
        REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
                                          bitmaps[1].getPixels(),
                                          bitmaps[0].getSize()));
    }
}