C++ clipRect函数代码示例

void CCameraBlurFilter::draw(float amount, bool clearDepth) {
  if (amount <= 0.f)
    return;

  SClipScreenRect clipRect(g_Viewport);
  CGraphics::ResolveSpareTexture(clipRect, 0, clearDepth);
  float aspect = CGraphics::g_CroppedViewport.xc_width / float(CGraphics::g_CroppedViewport.x10_height);

  float xFac = CGraphics::g_CroppedViewport.xc_width / float(g_Viewport.x8_width);
  float yFac = CGraphics::g_CroppedViewport.x10_height / float(g_Viewport.xc_height);
  float xBias = CGraphics::g_CroppedViewport.x4_left / float(g_Viewport.x8_width);
  float yBias = CGraphics::g_CroppedViewport.x8_top / float(g_Viewport.xc_height);

  Vert verts[4] = {
      {{-1.0, -1.0}, {xBias, yBias}},
      {{-1.0, 1.0}, {xBias, yBias + yFac}},
      {{1.0, -1.0}, {xBias + xFac, yBias}},
      {{1.0, 1.0}, {xBias + xFac, yBias + yFac}},
  };
  m_vbo->load(verts, sizeof(verts));

  for (int i = 0; i < 6; ++i) {
    float tmp = i;
    tmp *= 2.f * M_PIF;
    tmp /= 6.f;

    float amtX = std::cos(tmp);
    amtX *= amount / 448.f / aspect;

    float amtY = std::sin(tmp);
    amtY *= amount / 448.f;

    m_uniform.m_uv[i][0] = amtX * xFac;
    m_uniform.m_uv[i][1] = amtY * yFac;
  }
  m_uniform.m_opacity = std::min(amount / 2.f, 1.f);
  m_uniBuf->load(&m_uniform, sizeof(m_uniform));

  CGraphics::SetShaderDataBinding(m_dataBind);
  CGraphics::DrawArray(0, 4);
}

void CanvasRenderingContext2D::putImageData(ImageData* data, float dx, float dy, float dirtyX, float dirtyY, 
                                            float dirtyWidth, float dirtyHeight, ExceptionCode& ec)
{
    if (!data) {
        ec = TYPE_MISMATCH_ERR;
        return;
    }
    if (!isfinite(dx) || !isfinite(dy) || !isfinite(dirtyX) || 
        !isfinite(dirtyY) || !isfinite(dirtyWidth) || !isfinite(dirtyHeight)) {
        ec = INDEX_SIZE_ERR;
        return;
    }

    ImageBuffer* buffer = m_canvas ? m_canvas->buffer() : 0;
    if (!buffer)
        return;

    if (dirtyWidth < 0) {
        dirtyX += dirtyWidth;
        dirtyWidth = -dirtyWidth;
    }

    if (dirtyHeight < 0) {
        dirtyY += dirtyHeight;
        dirtyHeight = -dirtyHeight;
    }

    FloatRect clipRect(dirtyX, dirtyY, dirtyWidth, dirtyHeight);
    clipRect.intersect(IntRect(0, 0, data->width(), data->height()));
    IntSize destOffset(static_cast<int>(dx), static_cast<int>(dy));
    IntRect sourceRect = enclosingIntRect(clipRect);
    sourceRect.move(destOffset);
    sourceRect.intersect(IntRect(IntPoint(), buffer->size()));
    if (sourceRect.isEmpty())
        return;
    willDraw(sourceRect);
    sourceRect.move(-destOffset);
    IntPoint destPoint(destOffset.width(), destOffset.height());
    
    buffer->putImageData(data, sourceRect, destPoint);
}

void
PaintedLayerComposite::RenderLayer(const nsIntRect& aClipRect)
{
  if (!mBuffer || !mBuffer->IsAttached()) {
    return;
  }
  PROFILER_LABEL("PaintedLayerComposite", "RenderLayer",
    js::ProfileEntry::Category::GRAPHICS);

  MOZ_ASSERT(mBuffer->GetCompositor() == mCompositeManager->GetCompositor() &&
             mBuffer->GetLayer() == this,
             "buffer is corrupted");

  const nsIntRegion& visibleRegion = GetEffectiveVisibleRegion();
  gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);

#ifdef MOZ_DUMP_PAINTING
  if (gfxUtils::sDumpPainting) {
    RefPtr<gfx::DataSourceSurface> surf = mBuffer->GetAsSurface();
    if (surf) {
      WriteSnapshotToDumpFile(this, surf);
    }
  }
#endif

  EffectChain effectChain(this);
  LayerManagerComposite::AutoAddMaskEffect autoMaskEffect(mMaskLayer, effectChain);
  AddBlendModeEffect(effectChain);

  mBuffer->SetPaintWillResample(MayResample());

  mBuffer->Composite(effectChain,
                     GetEffectiveOpacity(),
                     GetEffectiveTransform(),
                     GetEffectFilter(),
                     clipRect,
                     &visibleRegion);
  mBuffer->BumpFlashCounter();

  mCompositeManager->GetCompositor()->MakeCurrent();
}

void ossimQtRoiRectAnnotator::paintAnnotation( QPainter* p,
                                               int clipx,
                                               int clipy,
                                               int clipw,
                                               int cliph )
{
   if ( !p || (thePoints.size() != 2) )
   {
      return;
   }

   ossimIrect clipRect(clipx, clipy, clipx + (clipw - 1), clipy + (cliph - 1));
   if (clipRect.intersects(getRoiRect()))
   {
      QRect r;
      r.setCoords(thePoints[0].x, thePoints[0].y,
                  thePoints[1].x, thePoints[1].y);
      p->setPen(thePenColor);
      p->drawRect(r);
   }
}

ClipRect PaintLayerClipper::applyOverflowClipToBackgroundRectWithGeometryMapper(
    const ClipRectsContext& context,
    const ClipRect& clip) const {
  const LayoutObject& layoutObject = *m_layer.layoutObject();
  FloatRect clipRect(clip.rect());
  if (shouldClipOverflow(context)) {
    LayoutRect layerBoundsWithVisualOverflow =
        layoutObject.isLayoutView()
            ? toLayoutView(layoutObject).viewRect()
            : toLayoutBox(layoutObject).visualOverflowRect();
    toLayoutBox(layoutObject)
        .flipForWritingMode(
            // PaintLayer are in physical coordinates, so the overflow has to be
            // flipped.
            layerBoundsWithVisualOverflow);
    mapLocalToRootWithGeometryMapper(context, layerBoundsWithVisualOverflow);
    clipRect.intersect(FloatRect(layerBoundsWithVisualOverflow));
  }

  return ClipRect(LayoutRect(clipRect));
}

void EllipsisBox::paintSelection(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font)
{
    Color textColor = renderer().resolveColor(style, CSSPropertyColor);
    Color c = renderer().selectionBackgroundColor();
    if (!c.alpha())
        return;

    // If the text color ends up being the same as the selection background, invert the selection
    // background.
    if (textColor == c)
        c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());

    GraphicsContextStateSaver stateSaver(*context);
    LayoutUnit top = root().selectionTop();
    LayoutUnit h = root().selectionHeight();
    const int deltaY = roundToInt(logicalTop() - top);
    const FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
    FloatRect clipRect(localOrigin, FloatSize(m_logicalWidth, h.toFloat()));
    context->clip(clipRect);
    context->drawHighlightForText(font, constructTextRun(&renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), localOrigin, h, c);
}

void EllipsisBox::paintSelection(GraphicsContext* context, const LayoutPoint& paintOffset, RenderStyle* style, const Font& font)
{
    Color textColor = style->visitedDependentColor(CSSPropertyColor);
    Color c = m_renderer->selectionBackgroundColor();
    if (!c.isValid() || !c.alpha())
        return;

    // If the text color ends up being the same as the selection background, invert the selection
    // background.
    if (textColor == c)
        c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());

    GraphicsContextStateSaver stateSaver(*context);
    LayoutUnit top = root()->selectionTop();
    LayoutUnit h = root()->selectionHeight();
    FloatRect clipRect(x() + paintOffset.x(), top + paintOffset.y(), m_logicalWidth, h);
    alignSelectionRectToDevicePixels(clipRect);
    context->clip(clipRect);
    // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
    context->drawHighlightForText(font, RenderBlock::constructTextRun(renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), roundedIntPoint(LayoutPoint(x() + paintOffset.x(), y() + paintOffset.y() + top)), h, c, style->colorSpace());
}

void PlatformContextCairo::clipForPatternFilling(const GraphicsContextState& state)
{
    ASSERT(state.fillPattern);

    // Hold current cairo path in a variable for restoring it after configuring the pattern clip rectangle.
    auto currentPath = cairo_copy_path(m_cr.get());
    cairo_new_path(m_cr.get());

    // Initialize clipping extent from current cairo clip extents, then shrink if needed according to pattern.
    // Inspired by GraphicsContextQt::drawRepeatPattern.
    double x1, y1, x2, y2;
    cairo_clip_extents(m_cr.get(), &x1, &y1, &x2, &y2);
    FloatRect clipRect(x1, y1, x2 - x1, y2 - y1);

    Image* patternImage = state.fillPattern->tileImage();
    ASSERT(patternImage);
    const AffineTransform& patternTransform = state.fillPattern->getPatternSpaceTransform();
    FloatRect patternRect = patternTransform.mapRect(FloatRect(0, 0, patternImage->width(), patternImage->height()));

    bool repeatX = state.fillPattern->repeatX();
    bool repeatY = state.fillPattern->repeatY();

    if (!repeatX) {
        clipRect.setX(patternRect.x());
        clipRect.setWidth(patternRect.width());
    }
    if (!repeatY) {
        clipRect.setY(patternRect.y());
        clipRect.setHeight(patternRect.height());
    }
    if (!repeatX || !repeatY) {
        cairo_rectangle(m_cr.get(), clipRect.x(), clipRect.y(), clipRect.width(), clipRect.height());
        cairo_clip(m_cr.get());
    }

    // Restoring cairo path.
    cairo_append_path(m_cr.get(), currentPath);
    cairo_path_destroy(currentPath);
}

void TableCellPainter::paintBackgroundsBehindCell(const PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutObject* backgroundObject, DisplayItem::Type type)
{
    if (!backgroundObject)
        return;

    if (m_layoutTableCell.style()->visibility() != VISIBLE)
        return;

    LayoutTable* tableElt = m_layoutTableCell.table();
    if (!tableElt->collapseBorders() && m_layoutTableCell.style()->emptyCells() == EmptyCellsHide && !m_layoutTableCell.firstChild())
        return;

    LayoutRect paintRect = paintBounds(paintOffset, backgroundObject != &m_layoutTableCell ? AddOffsetFromParent : DoNotAddOffsetFromParent);

    // Record drawing only if the cell is painting background from containers.
    Optional<LayoutObjectDrawingRecorder> recorder;
    if (backgroundObject != &m_layoutTableCell) {
        if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutTableCell, type))
            return;
        recorder.emplace(paintInfo.context, m_layoutTableCell, type, paintRect);
    } else {
        ASSERT(paintRect.location() == paintOffset);
    }

    Color c = backgroundObject->resolveColor(CSSPropertyBackgroundColor);
    const FillLayer& bgLayer = backgroundObject->style()->backgroundLayers();
    if (bgLayer.hasImage() || c.alpha()) {
        // We have to clip here because the background would paint
        // on top of the borders otherwise.  This only matters for cells and rows.
        bool shouldClip = backgroundObject->hasLayer() && (backgroundObject == &m_layoutTableCell || backgroundObject == m_layoutTableCell.parent()) && tableElt->collapseBorders();
        GraphicsContextStateSaver stateSaver(paintInfo.context, shouldClip);
        if (shouldClip) {
            LayoutRect clipRect(paintRect.location(), m_layoutTableCell.size());
            clipRect.expand(m_layoutTableCell.borderInsets());
            paintInfo.context.clip(pixelSnappedIntRect(clipRect));
        }
        BoxPainter(m_layoutTableCell).paintFillLayers(paintInfo, c, bgLayer, paintRect, BackgroundBleedNone, SkXfermode::kSrcOver_Mode, backgroundObject);
    }
}

void EllipsisBoxPainter::paintSelection(GraphicsContext& context, const LayoutPoint& boxOrigin, const ComputedStyle& style, const Font& font)
{
    Color textColor = m_ellipsisBox.getLineLayoutItem().resolveColor(style, CSSPropertyColor);
    Color c = m_ellipsisBox.getLineLayoutItem().selectionBackgroundColor();
    if (!c.alpha())
        return;

    // If the text color ends up being the same as the selection background, invert the selection
    // background.
    if (textColor == c)
        c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());

    GraphicsContextStateSaver stateSaver(context);
    LayoutUnit selectionBottom = m_ellipsisBox.root().selectionBottom();
    LayoutUnit top = m_ellipsisBox.root().selectionTop();
    LayoutUnit h = m_ellipsisBox.root().selectionHeight();
    const int deltaY = roundToInt(m_ellipsisBox.getLineLayoutItem().styleRef().isFlippedLinesWritingMode() ? selectionBottom - m_ellipsisBox.logicalBottom() : m_ellipsisBox.logicalTop() - top);
    const FloatPoint localOrigin(LayoutPoint(boxOrigin.x(), boxOrigin.y() - deltaY));
    FloatRect clipRect(localOrigin, FloatSize(LayoutSize(m_ellipsisBox.logicalWidth(), h)));
    context.clip(clipRect);
    context.drawHighlightForText(font, constructTextRun(font, m_ellipsisBox.ellipsisStr(), style, TextRun::AllowTrailingExpansion), localOrigin, h, c);
}

void ThreadedCompositor::renderLayerTree()
{
    if (!m_scene)
        return;

    if (!ensureGLContext())
        return;

    FloatRect clipRect(0, 0, m_viewportSize.width(), m_viewportSize.height());

    TransformationMatrix viewportTransform;
    FloatPoint scrollPostion = viewportController()->visibleContentsRect().location();
    viewportTransform.scale(viewportController()->pageScaleFactor());
    viewportTransform.translate(-scrollPostion.x(), -scrollPostion.y());

    m_scene->paintToCurrentGLContext(viewportTransform, 1, clipRect, Color::white, false, scrollPostion);

#if PLATFORM(BCM_RPI)
    auto bufferExport = m_surface->lockFrontBuffer();
    m_compositingManager.commitBCMBuffer(bufferExport);
#endif

#if PLATFORM(BCM_NEXUS)
    auto bufferExport = m_surface->lockFrontBuffer();
    m_compositingManager.commitBCMNexusBuffer(bufferExport);
#endif

#if PLATFORM(INTEL_CE)
    auto bufferExport = m_surface->lockFrontBuffer();
    m_compositingManager.commitIntelCEBuffer(bufferExport);
#endif

    glContext()->swapBuffers();

#if PLATFORM(GBM)
    auto bufferExport = m_surface->lockFrontBuffer();
    m_compositingManager.commitPrimeBuffer(bufferExport);
#endif
}

    virtual void frameRectsChanged()
    {
        if (!platformWidget())
            return;

        IntRect windowRect = convertToContainingWindow(IntRect(0, 0, frameRect().width(), frameRect().height()));
        platformWidget()->setGeometry(windowRect);

        ScrollView* parentScrollView = parent();
        if (!parentScrollView)
            return;

        ASSERT(parentScrollView->isFrameView());
        IntRect clipRect(static_cast<FrameView*>(parentScrollView)->windowClipRect());
        clipRect.move(-windowRect.x(), -windowRect.y());
        clipRect.intersect(platformWidget()->rect());

        QRegion clipRegion = QRegion(clipRect);
        platformWidget()->setMask(clipRegion);

        handleVisibility();
    }

	Rect2I GUIInputCaret::getSpriteClipRect(const Rect2I& parentClipRect) const
	{
		Vector2I offset(mElement->_getLayoutData().area.x, mElement->_getLayoutData().area.y);

		Vector2I clipOffset = getSpriteOffset() - offset -
			Vector2I(mElement->_getTextInputRect().x, mElement->_getTextInputRect().y);

		Rect2I clipRect(-clipOffset.x, -clipOffset.y, mTextDesc.width, mTextDesc.height);

		Rect2I localParentCliprect = parentClipRect;

		// Move parent rect to our space
		localParentCliprect.x += mElement->_getTextInputOffset().x + clipRect.x;
		localParentCliprect.y += mElement->_getTextInputOffset().y + clipRect.y;

		// Clip our rectangle so its not larger then the parent
		clipRect.clip(localParentCliprect);

		// Increase clip size by 1, so we can fit the caret in case it is fully at the end of the text
		clipRect.width += 1;

		return clipRect;
	}

NS_IMETHODIMP
nsFileControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                     const nsRect&           aDirtyRect,
                                     const nsDisplayListSet& aLists)
{
  // Our background is inherited to the text input, and we don't really want to
  // paint it or out padding and borders (which we never have anyway, per
  // styles in forms.css) -- doing it just makes us look ugly in some cases and
  // has no effect in others.
  nsDisplayListCollection tempList;
  nsresult rv = nsAreaFrame::BuildDisplayList(aBuilder, aDirtyRect, tempList);
  if (NS_FAILED(rv))
    return rv;

  tempList.BorderBackground()->DeleteAll();

  // Clip height only
  nsRect clipRect(aBuilder->ToReferenceFrame(this), GetSize());
  clipRect.width = GetOverflowRect().XMost();
  rv = OverflowClip(aBuilder, tempList, aLists, clipRect);
  NS_ENSURE_SUCCESS(rv, rv);

  // Disabled file controls don't pass mouse events to their children, so we
  // put an invisible item in the display list above the children
  // just to catch events
  // REVIEW: I'm not sure why we do this, but that's what nsFileControlFrame::
  // GetFrameForPoint was doing
  if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::disabled) && 
      IsVisibleForPainting(aBuilder)) {
    nsDisplayItem* item = new (aBuilder) nsDisplayEventReceiver(this);
    if (!item)
      return NS_ERROR_OUT_OF_MEMORY;
    aLists.Content()->AppendToTop(item);
  }

  return DisplaySelectionOverlay(aBuilder, aLists);
}

bool GiGraphics::setClipBox(const RECT_2D& rc)
{
    if (!isDrawing() || isStopping())
        return false;

    bool ret = false;
    Box2d rect;

    if (!rect.intersectWith(Box2d(rc), Box2d(m_impl->clipBox0)).isEmpty()) {
        if (rect != Box2d(m_impl->clipBox)) {
            rect.get(m_impl->clipBox);
            m_impl->rectDraw.set(Box2d(rc));
            m_impl->rectDraw.inflate(GiGraphicsImpl::CLIP_INFLATE);
            m_impl->rectDrawM = m_impl->rectDraw * xf().displayToModel();
            m_impl->rectDrawW = m_impl->rectDrawM * xf().modelToWorld();
            SafeCall(m_impl->canvas, clipRect(m_impl->clipBox.left, m_impl->clipBox.top,
                                              m_impl->clipBox.width(),
                                              m_impl->clipBox.height()));
        }
        ret = true;
    }

    return ret;
}