C++ nsRect类代码示例

NS_IMETHODIMP
nsLineIterator::GetLine(PRInt32 aLineNumber,
                        nsIFrame** aFirstFrameOnLine,
                        PRInt32* aNumFramesOnLine,
                        nsRect& aLineBounds,
                        PRUint32* aLineFlags)
{
  NS_ENSURE_ARG_POINTER(aFirstFrameOnLine);
  NS_ENSURE_ARG_POINTER(aNumFramesOnLine);
  NS_ENSURE_ARG_POINTER(aLineFlags);

  if ((aLineNumber < 0) || (aLineNumber >= mNumLines)) {
    *aFirstFrameOnLine = nsnull;
    *aNumFramesOnLine = 0;
    aLineBounds.SetRect(0, 0, 0, 0);
    return NS_OK;
  }
  nsLineBox* line = mLines[aLineNumber];
  *aFirstFrameOnLine = line->mFirstChild;
  *aNumFramesOnLine = line->GetChildCount();
  aLineBounds = line->mBounds;

  PRUint32 flags = 0;
  if (line->IsBlock()) {
    flags |= NS_LINE_FLAG_IS_BLOCK;
  }
  else {
    if (line->HasBreakAfter())
      flags |= NS_LINE_FLAG_ENDS_IN_BREAK;
  }
  *aLineFlags = flags;

  return NS_OK;
}

nsresult
nsScreen::GetRect(nsRect& aRect)
{
    // Return window inner rect to prevent fingerprinting.
    if (ShouldResistFingerprinting()) {
        return GetWindowInnerRect(aRect);
    }

    nsDeviceContext *context = GetDeviceContext();

    if (!context) {
        return NS_ERROR_FAILURE;
    }

    context->GetRect(aRect);
    LayoutDevicePoint screenTopLeftDev =
        LayoutDevicePixel::FromAppUnits(aRect.TopLeft(),
                                        context->AppUnitsPerDevPixel());
    DesktopPoint screenTopLeftDesk =
        screenTopLeftDev / context->GetDesktopToDeviceScale();

    aRect.x = NSToIntRound(screenTopLeftDesk.x);
    aRect.y = NSToIntRound(screenTopLeftDesk.y);

    aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
    aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);

    return NS_OK;
}

void
TouchCaret::SetTouchFramePos(const nsRect& aCaretRect)
{
  nsCOMPtr<nsIPresShell> presShell = do_QueryReferent(mPresShell);
  if (!presShell) {
    return;
  }

  mozilla::dom::Element* touchCaretElement = presShell->GetTouchCaretElement();
  if (!touchCaretElement) {
    return;
  }

  // Convert aOrigin to CSS pixels.
  RefPtr<nsPresContext> presContext = presShell->GetPresContext();
  int32_t x = presContext->AppUnitsToIntCSSPixels(aCaretRect.Center().x);
  int32_t y = presContext->AppUnitsToIntCSSPixels(aCaretRect.y);
  int32_t padding = presContext->AppUnitsToIntCSSPixels(aCaretRect.height);

  nsAutoString styleStr;
  styleStr.AppendLiteral("left: ");
  styleStr.AppendInt(x);
  styleStr.AppendLiteral("px; top: ");
  styleStr.AppendInt(y);
  styleStr.AppendLiteral("px; padding-top: ");
  styleStr.AppendInt(padding);
  styleStr.AppendLiteral("px;");

  TOUCHCARET_LOG("Set style: %s", NS_ConvertUTF16toUTF8(styleStr).get());

  touchCaretElement->SetAttr(kNameSpaceID_None, nsGkAtoms::style,
                             styleStr, true);
}

void
DisplayItemClip::AddOffsetAndComputeDifference(const nsPoint& aOffset,
                                               const nsRect& aBounds,
                                               const DisplayItemClip& aOther,
                                               const nsRect& aOtherBounds,
                                               nsRegion* aDifference)
{
  if (mHaveClipRect != aOther.mHaveClipRect ||
      mRoundedClipRects.Length() != aOther.mRoundedClipRects.Length()) {
    aDifference->Or(*aDifference, aBounds);
    aDifference->Or(*aDifference, aOtherBounds);
    return;
  }
  if (mHaveClipRect) {
    AccumulateRectDifference(mClipRect + aOffset, aOther.mClipRect,
                             aBounds.Union(aOtherBounds),
                             aDifference);
  }
  for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
    if (mRoundedClipRects[i] + aOffset != aOther.mRoundedClipRects[i]) {
      // The corners make it tricky so we'll just add both rects here.
      aDifference->Or(*aDifference, mRoundedClipRects[i].mRect.Intersect(aBounds));
      aDifference->Or(*aDifference, aOther.mRoundedClipRects[i].mRect.Intersect(aOtherBounds));
    }
  }
}

/*
 * Reduce rect to 1 app unit width along either left or right edge base on
 * aToRightEdge parameter.
 */
static void
ReduceRectToVerticalEdge(nsRect& aRect, bool aToRightEdge)
{
  if (aToRightEdge) {
    aRect.x = aRect.XMost() - 1;
  }
  aRect.width = 1;
}

bool
DisplayItemClip::MayIntersect(const nsRect& aRect) const
{
  if (!mHaveClipRect) {
    return !aRect.IsEmpty();
  }
  nsRect r = aRect.Intersect(mClipRect);
  if (r.IsEmpty()) {
    return false;
  }
  for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
    const RoundedRect& rr = mRoundedClipRects[i];
    if (!nsLayoutUtils::RoundedRectIntersectsRect(rr.mRect, rr.mRadii, r)) {
      return false;
    }
  }
  return true;
}

NS_IMETHODIMP nsRenderingContextPh :: GetClipRect( nsRect &aRect, PRBool &aClipValid ) 
{
	PRInt32 x, y, w, h;
	
	if ( !mClipRegion )
		return NS_ERROR_FAILURE;
	
	if( !mClipRegion->IsEmpty() ) {
		mClipRegion->GetBoundingBox( &x, &y, &w, &h );
		aRect.SetRect( x, y, w, h );
		aClipValid = PR_TRUE;
	}
	else {
		aRect.SetRect(0,0,0,0);
		aClipValid = PR_FALSE;
	}
	return NS_OK;
}

nsresult
nsDeviceContext::GetRect(nsRect &aRect)
{
    if (IsPrinterContext()) {
        aRect.SetRect(0, 0, mWidth, mHeight);
    } else
        ComputeFullAreaUsingScreen ( &aRect );

    return NS_OK;
}

// Computes the difference between aR1 and aR2, limited to aBounds.
static void
AccumulateRectDifference(const nsRect& aR1, const nsRect& aR2, const nsRect& aBounds, nsRegion* aOut)
{
  if (aR1.IsEqualInterior(aR2))
    return;
  nsRegion r;
  r.Xor(aR1, aR2);
  r.And(r, aBounds);
  aOut->Or(*aOut, r);
}

static nsRect
GetSVGBBox(nsIFrame* aNonSVGFrame, nsIFrame* aCurrentFrame,
           const nsRect& aCurrentOverflow, const nsRect& aUserSpaceRect)
{
  NS_ASSERTION(!aNonSVGFrame->GetPrevContinuation(),
               "Need first continuation here");
  // Compute union of all overflow areas relative to 'first'.
  BBoxCollector collector(aNonSVGFrame, aCurrentFrame, aCurrentOverflow);
  nsLayoutUtils::GetAllInFlowBoxes(aNonSVGFrame, &collector);
  // Get it into "user space" for non-SVG frames
  return collector.mResult - aUserSpaceRect.TopLeft();
}

static void
ClipMarker(const nsRect&                          aContentArea,
           const nsRect&                          aMarkerRect,
           DisplayListClipState::AutoSaveRestore& aClipState)
{
  nscoord rightOverflow = aMarkerRect.XMost() - aContentArea.XMost();
  nsRect markerRect = aMarkerRect;
  if (rightOverflow > 0) {
    // Marker overflows on the right side (content width < marker width).
    markerRect.width -= rightOverflow;
    aClipState.ClipContentDescendants(markerRect);
  } else {
    nscoord leftOverflow = aContentArea.x - aMarkerRect.x;
    if (leftOverflow > 0) {
      // Marker overflows on the left side
      markerRect.width -= leftOverflow;
      markerRect.x += leftOverflow;
      aClipState.ClipContentDescendants(markerRect);
    }
  }
}

nsresult
nsIFrame::GetClientRect(nsRect& aClientRect)
{
  aClientRect = mRect;
  aClientRect.MoveTo(0,0);

  nsMargin borderPadding;
  GetBorderAndPadding(borderPadding);

  aClientRect.Deflate(borderPadding);

  if (aClientRect.width < 0)
     aClientRect.width = 0;

  if (aClientRect.height < 0)
     aClientRect.height = 0;

 // NS_ASSERTION(aClientRect.width >=0 && aClientRect.height >= 0, "Content Size < 0");

  return NS_OK;
}

void
nsBlockReflowState::ComputeReplacedBlockOffsetsForFloats(nsIFrame* aFrame,
                                                         const nsRect& aFloatAvailableSpace,
                                                         nscoord& aLeftResult,
                                                         nscoord& aRightResult)
{
  nsRect contentArea =
    mContentArea.GetPhysicalRect(mReflowState.GetWritingMode(), mContainerWidth);
  // The frame is clueless about the float manager and therefore we
  // only give it free space. An example is a table frame - the
  // tables do not flow around floats.
  // However, we can let its margins intersect floats.
  NS_ASSERTION(aFloatAvailableSpace.x >= contentArea.x, "bad avail space rect x");
  NS_ASSERTION(aFloatAvailableSpace.width == 0 ||
               aFloatAvailableSpace.XMost() <= contentArea.XMost(),
               "bad avail space rect width");

  nscoord leftOffset, rightOffset;
  if (aFloatAvailableSpace.width == contentArea.width) {
    // We don't need to compute margins when there are no floats around.
    leftOffset = 0;
    rightOffset = 0;
  } else {
    nsMargin frameMargin;
    nsCSSOffsetState os(aFrame, mReflowState.rendContext, contentArea.width);
    frameMargin = os.ComputedPhysicalMargin();

    nscoord leftFloatXOffset = aFloatAvailableSpace.x - contentArea.x;
    leftOffset = std::max(leftFloatXOffset, frameMargin.left) -
                 frameMargin.left;
    leftOffset = std::max(leftOffset, 0); // in case of negative margin
    nscoord rightFloatXOffset =
      contentArea.XMost() - aFloatAvailableSpace.XMost();
    rightOffset = std::max(rightFloatXOffset, frameMargin.right) -
                  frameMargin.right;
    rightOffset = std::max(rightOffset, 0); // in case of negative margin
  }
  aLeftResult = leftOffset;
  aRightResult = rightOffset;
}

void CircleArea::GetRect(nsIFrame* aFrame, nsRect& aRect)
{
  if (mNumCoords >= 3) {
    nscoord x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
    nscoord y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
    nscoord radius = nsPresContext::CSSPixelsToAppUnits(mCoords[2]);
    if (radius < 0) {
      return;
    }

    aRect.SetRect(x1 - radius, y1 - radius, x1 + radius, y1 + radius);
  }
}

void
nsSVGForeignObjectFrame::InvalidateDirtyRect(nsSVGOuterSVGFrame* aOuter,
    const nsRect& aRect, PRUint32 aFlags)
{
  if (aRect.IsEmpty())
    return;

  // Don't invalidate areas outside our bounds:
  nsRect rect = aRect.Intersect(mRect);
  if (rect.IsEmpty())
    return;

  // The areas dirtied by children are in app units, relative to this frame.
  // We need to convert the rect from app units in our userspace to app units
  // relative to our nsSVGOuterSVGFrame's content rect.

  gfxRect r(aRect.x, aRect.y, aRect.width, aRect.height);
  r.Scale(1.0 / nsPresContext::AppUnitsPerCSSPixel());
  rect = ToCanvasBounds(r, GetCanvasTM(), PresContext());
  rect = nsSVGUtils::FindFilterInvalidation(this, rect);
  aOuter->InvalidateWithFlags(rect, aFlags);
}