C++ SkRect::setLTRB方法代码示例

    virtual void onDraw(SkCanvas* canvas) {
        SkMatrix m;
        m.reset();
        m.setRotate(33 * SK_Scalar1);
        m.postScale(3000 * SK_Scalar1, 3000 * SK_Scalar1);
        m.postTranslate(6000 * SK_Scalar1, -5000 * SK_Scalar1);
        canvas->concat(m);

        SkPaint paint;
        paint.setColor(SK_ColorRED);
        paint.setAntiAlias(true);

        bool success = m.invert(&m);
        SkASSERT(success);
        (void) success; // silence compiler :(

        SkPath path;

        SkPoint pt = {10 * SK_Scalar1, 10 * SK_Scalar1};
        SkScalar small = 1 / (500 * SK_Scalar1);

        m.mapPoints(&pt, 1);
        path.addCircle(pt.fX, pt.fY, small);
        canvas->drawPath(path, paint);

        pt.set(30 * SK_Scalar1, 10 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkRect rect = {pt.fX - small, pt.fY - small,
                       pt.fX + small, pt.fY + small};
        canvas->drawRect(rect, paint);

        SkBitmap bmp;
        bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
        bmp.allocPixels();
        bmp.lockPixels();
        uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
        pixels[0] = SkPackARGB32(0xFF, 0xFF, 0x00, 0x00);
        pixels[1] = SkPackARGB32(0xFF, 0x00, 0xFF, 0x00);
        pixels[2] = SkPackARGB32(0x80, 0x00, 0x00, 0x00);
        pixels[3] = SkPackARGB32(0xFF, 0x00, 0x00, 0xFF);
        bmp.unlockPixels();
        pt.set(30 * SK_Scalar1, 30 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkShader* shader = SkShader::CreateBitmapShader(
                                            bmp,
                                            SkShader::kRepeat_TileMode,
                                            SkShader::kRepeat_TileMode);
        SkMatrix s;
        s.reset();
        s.setScale(SK_Scalar1 / 1000, SK_Scalar1 / 1000);
        shader->setLocalMatrix(s);
        paint.setShader(shader)->unref();
        paint.setAntiAlias(false);
        paint.setFilterLevel(SkPaint::kLow_FilterLevel);
        rect.setLTRB(pt.fX - small, pt.fY - small,
                     pt.fX + small, pt.fY + small);
        canvas->drawRect(rect, paint);
    }

int
_DC::FillSolidRect(RECTDef* pRect, COLORREF crFillColor){
	if( !context_ ) return 0;

	int nRet = 0;
	if (_canvas) {
		SkPaint paint;
		paint.setColor(SkColorSetRGB(_GetRValue(crFillColor), _GetGValue(crFillColor), _GetBValue(crFillColor)));
		
		SkRect rect;
		// Invert rect cords for windows memory bitmap.
		if (this->image_) {
			int height = _canvas->imageInfo().fHeight;
			rect.setLTRB(SkIntToScalar(pRect->left),
				SkIntToScalar(height - pRect->top),
				SkIntToScalar(pRect->right),
				SkIntToScalar(height - pRect->bottom));
		}
		else {
			rect.setLTRB(SkIntToScalar(pRect->left),
				SkIntToScalar(pRect->top),
				SkIntToScalar(pRect->right),
				SkIntToScalar(pRect->bottom));
		}
		_canvas->drawRect(rect, paint);
		
		/*
		SkImageInfo imageInfo;
		imageInfo.fAlphaType = SkAlphaType::kOpaque_SkAlphaType;
		imageInfo.fColorType = SkColorType::kN32_SkColorType;
		imageInfo.fHeight = 5;
		imageInfo.fWidth = 5;

		SkBitmap bm;
		bm.setInfo(imageInfo);

		_canvas->readPixels(&bm, 0, 0);*/
		}
	else {
		HBRUSH	hBrush = CreateSolidBrush(crFillColor);
		nRet = ::FillRect(context_, pRect, hBrush);
		::DeleteObject(hBrush);
		}
	return nRet;
	}

// found and fixed for android: not initializing rect for string's of length 0
static void regression_measureText(skiatest::Reporter* reporter) {

    SkPaint paint;
    paint.setTextSize(SkFloatToScalar(12.0f));

    SkRect r;
    r.setLTRB(SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN);

    // test that the rect was reset
    paint.measureText("", 0, &r, SkFloatToScalar(1.0f));
    REPORTER_ASSERT(reporter, r.isEmpty());
}

void GrDrawContext::drawPaint(GrRenderTarget* rt,
                              const GrClip& clip,
                              const GrPaint& origPaint,
                              const SkMatrix& viewMatrix) {
    RETURN_IF_ABANDONED
    // set rect to be big enough to fill the space, but not super-huge, so we
    // don't overflow fixed-point implementations
    SkRect r;
    r.setLTRB(0, 0,
              SkIntToScalar(rt->width()),
              SkIntToScalar(rt->height()));
    SkTCopyOnFirstWrite<GrPaint> paint(origPaint);

    // by definition this fills the entire clip, no need for AA
    if (paint->isAntiAlias()) {
        paint.writable()->setAntiAlias(false);
    }

    bool isPerspective = viewMatrix.hasPerspective();

    // We attempt to map r by the inverse matrix and draw that. mapRect will
    // map the four corners and bound them with a new rect. This will not
    // produce a correct result for some perspective matrices.
    if (!isPerspective) {
        SkMatrix inverse;
        if (!viewMatrix.invert(&inverse)) {
            SkDebugf("Could not invert matrix\n");
            return;
        }
        inverse.mapRect(&r);
        this->drawRect(rt, clip, *paint, viewMatrix, r);
    } else {
        SkMatrix localMatrix;
        if (!viewMatrix.invert(&localMatrix)) {
            SkDebugf("Could not invert matrix\n");
            return;
        }

        AutoCheckFlush acf(fContext);
        if (!this->prepareToDraw(rt)) {
            return;
        }

        GrPipelineBuilder pipelineBuilder(*paint, rt, clip);
        fDrawTarget->drawBWRect(pipelineBuilder,
                                paint->getColor(),
                                SkMatrix::I(),
                                r,
                                NULL,
                                &localMatrix);
    }
}

bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
                                               const SkStrokeRec& stroke,
                                               GrDrawTarget* target,
                                               bool antiAlias) {
    SkASSERT(!antiAlias);
    SkASSERT(!stroke.isHairlineStyle());

    GrDrawState* drawState = target->drawState();
    SkASSERT(drawState->getStencil().isDisabled());

    SkAutoTUnref<GrPath> p(fGpu->createPath(path));

    SkPath::FillType nonInvertedFill = SkPath::ConvertToNonInverseFillType(path.getFillType());
    target->stencilPath(p, stroke, nonInvertedFill);

    // TODO: Use built in cover operation rather than a rect draw. This will require making our
    // fragment shaders be able to eat varyings generated by a matrix.

    // fill the path, zero out the stencil
    SkRect bounds = p->getBounds();
    SkScalar bloat = drawState->getViewMatrix().getMaxStretch() * SK_ScalarHalf;
    GrDrawState::AutoViewMatrixRestore avmr;

    if (nonInvertedFill == path.getFillType()) {
        GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
            kZero_StencilOp,
            kZero_StencilOp,
            kNotEqual_StencilFunc,
            0xffff,
            0x0000,
            0xffff);
        *drawState->stencil() = kStencilPass;
    } else {
        GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
            kZero_StencilOp,
            kZero_StencilOp,
            // We know our rect will hit pixels outside the clip and the user bits will be 0
            // outside the clip. So we can't just fill where the user bits are 0. We also need to
            // check that the clip bit is set.
            kEqualIfInClip_StencilFunc,
            0xffff,
            0x0000,
            0xffff);
        SkMatrix vmi;
        bounds.setLTRB(0, 0,
                       SkIntToScalar(drawState->getRenderTarget()->width()),
                       SkIntToScalar(drawState->getRenderTarget()->height()));
        // mapRect through persp matrix may not be correct
        if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
            vmi.mapRect(&bounds);
            // theoretically could set bloat = 0, instead leave it because of matrix inversion
            // precision.
        } else {
            avmr.setIdentity(drawState);
            bloat = 0;
        }
        *drawState->stencil() = kInvertedStencilPass;
    }
    bounds.outset(bloat, bloat);
    target->drawSimpleRect(bounds, NULL);
    target->drawState()->stencil()->setDisabled();
    return true;
}