C++ gfxMatrix::Transform方法代码示例

/* [noscript] void draw(in gfxContext aContext,
 *                      in gfxGraphicsFilter aFilter,
 *                      [const] in gfxMatrix aUserSpaceToImageSpace,
 *                      [const] in gfxRect aFill,
 *                      [const] in nsIntRect aSubimage,
 *                      [const] in nsIntSize aViewportSize,
 *                      in PRUint32 aFlags); */
NS_IMETHODIMP
VectorImage::Draw(gfxContext* aContext,
                  gfxPattern::GraphicsFilter aFilter,
                  const gfxMatrix& aUserSpaceToImageSpace,
                  const gfxRect& aFill,
                  const nsIntRect& aSubimage,
                  const nsIntSize& aViewportSize,
                  PRUint32 aFlags)
{
  NS_ENSURE_ARG_POINTER(aContext);
  if (mError || !mIsFullyLoaded)
    return NS_ERROR_FAILURE;

  if (mIsDrawing) {
    NS_WARNING("Refusing to make re-entrant call to VectorImage::Draw");
    return NS_ERROR_FAILURE;
  }
  mIsDrawing = true;

  if (aViewportSize != mLastRenderedSize) {
    mSVGDocumentWrapper->UpdateViewportBounds(aViewportSize);
    mLastRenderedSize = aViewportSize;
  }
  mSVGDocumentWrapper->FlushImageTransformInvalidation();

  nsIntSize imageSize = mHaveRestrictedRegion ?
    mRestrictedRegion.Size() : aViewportSize;

  // XXXdholbert Do we need to convert image size from
  // CSS pixels to dev pixels here? (is gfxCallbackDrawable's 2nd arg in dev
  // pixels?)
  gfxIntSize imageSizeGfx(imageSize.width, imageSize.height);

  // Based on imgFrame::Draw
  gfxRect sourceRect = aUserSpaceToImageSpace.Transform(aFill);
  gfxRect imageRect(0, 0, imageSize.width, imageSize.height);
  gfxRect subimage(aSubimage.x, aSubimage.y, aSubimage.width, aSubimage.height);


  nsRefPtr<gfxDrawingCallback> cb =
    new SVGDrawingCallback(mSVGDocumentWrapper,
                           mHaveRestrictedRegion ?
                           mRestrictedRegion :
                           nsIntRect(nsIntPoint(0, 0), aViewportSize),
                           aFlags);

  nsRefPtr<gfxDrawable> drawable = new gfxCallbackDrawable(cb, imageSizeGfx);

  gfxUtils::DrawPixelSnapped(aContext, drawable,
                             aUserSpaceToImageSpace,
                             subimage, sourceRect, imageRect, aFill,
                             gfxASurface::ImageFormatARGB32, aFilter);

  mIsDrawing = false;
  return NS_OK;
}

NS_IMETHODIMP
ClippedImage::Draw(gfxContext* aContext,
                   gfxPattern::GraphicsFilter aFilter,
                   const gfxMatrix& aUserSpaceToImageSpace,
                   const gfxRect& aFill,
                   const nsIntRect& aSubimage,
                   const nsIntSize& aViewportSize,
                   const SVGImageContext* aSVGContext,
                   uint32_t aWhichFrame,
                   uint32_t aFlags)
{
  if (!ShouldClip()) {
    return InnerImage()->Draw(aContext, aFilter, aUserSpaceToImageSpace,
                              aFill, aSubimage, aViewportSize, aSVGContext,
                              aWhichFrame, aFlags);
  }

  // Check for tiling. If we need to tile then we need to create a
  // gfxCallbackDrawable to handle drawing for us.
  gfxRect sourceRect = aUserSpaceToImageSpace.Transform(aFill);
  if (MustCreateSurface(aContext, aUserSpaceToImageSpace, sourceRect, aSubimage, aFlags)) {
    // Create a temporary surface containing a single tile of this image.
    // GetFrame will call DrawSingleTile internally.
    nsRefPtr<gfxASurface> surface;
    GetFrameInternal(aViewportSize, aSVGContext, aWhichFrame, aFlags, getter_AddRefs(surface));
    NS_ENSURE_TRUE(surface, NS_ERROR_FAILURE);

    // Create a drawable from that surface.
    nsRefPtr<gfxSurfaceDrawable> drawable =
      new gfxSurfaceDrawable(surface, gfxIntSize(mClip.width, mClip.height));

    // Draw.
    gfxRect imageRect(0, 0, mClip.width, mClip.height);
    gfxRect subimage(aSubimage.x, aSubimage.y, aSubimage.width, aSubimage.height);
    gfxUtils::DrawPixelSnapped(aContext, drawable, aUserSpaceToImageSpace,
                               subimage, sourceRect, imageRect, aFill,
                               gfxASurface::ImageFormatARGB32, aFilter);

    return NS_OK;
  }

  // Determine the appropriate subimage for the inner image.
  nsIntRect innerSubimage(aSubimage);
  innerSubimage.MoveBy(mClip.x, mClip.y);
  innerSubimage.Intersect(mClip);

  return DrawSingleTile(aContext, aFilter, aUserSpaceToImageSpace, aFill, innerSubimage,
                        aViewportSize, aSVGContext, aWhichFrame, aFlags);
}

nsresult
ClippedImage::DrawSingleTile(gfxContext* aContext,
                             gfxPattern::GraphicsFilter aFilter,
                             const gfxMatrix& aUserSpaceToImageSpace,
                             const gfxRect& aFill,
                             const nsIntRect& aSubimage,
                             const nsIntSize& aViewportSize,
                             const SVGImageContext* aSVGContext,
                             uint32_t aWhichFrame,
                             uint32_t aFlags)
{
  MOZ_ASSERT(!MustCreateSurface(aContext, aUserSpaceToImageSpace,
                                aUserSpaceToImageSpace.Transform(aFill),
                                aSubimage - nsIntPoint(mClip.x, mClip.y), aFlags),
             "DrawSingleTile shouldn't need to create a surface");

  // Make the viewport reflect the original image's size.
  nsIntSize viewportSize(aViewportSize);
  int32_t imgWidth, imgHeight;
  if (NS_SUCCEEDED(InnerImage()->GetWidth(&imgWidth)) &&
      NS_SUCCEEDED(InnerImage()->GetHeight(&imgHeight))) {
    viewportSize = nsIntSize(imgWidth, imgHeight);
  } else {
    MOZ_ASSERT(false, "If ShouldClip() led us to draw then we should never get here");
  }

  // Add a translation to the transform to reflect the clipping region.
  gfxMatrix transform(aUserSpaceToImageSpace);
  transform.Multiply(gfxMatrix().Translate(gfxPoint(mClip.x, mClip.y)));

  // "Clamp the source rectangle" to the clipping region's width and height.
  // Really, this means modifying the transform to get the results we want.
  gfxRect sourceRect = transform.Transform(aFill);
  if (sourceRect.width > mClip.width || sourceRect.height > mClip.height) {
    gfxMatrix clampSource;
    clampSource.Translate(gfxPoint(sourceRect.x, sourceRect.y));
    clampSource.Scale(ClampFactor(sourceRect.width, mClip.width),
                      ClampFactor(sourceRect.height, mClip.height));
    clampSource.Translate(gfxPoint(-sourceRect.x, -sourceRect.y));
    transform.Multiply(clampSource);
  }

  return InnerImage()->Draw(aContext, aFilter, transform, aFill, aSubimage,
                            viewportSize, aSVGContext, aWhichFrame, aFlags);
}

bool
TabChild::RecvPDocumentRendererNativeIDConstructor(
        PDocumentRendererNativeIDChild *__a,
        const PRInt32& aX,
        const PRInt32& aY,
        const PRInt32& aW,
        const PRInt32& aH,
        const nsString& bgcolor,
        const PRUint32& flags,
        const bool& flush,
        const gfxMatrix& aMatrix,
        const PRUint32& aNativeID)
{
    mozilla::ipc::DocumentRendererNativeIDChild* render =
        static_cast<mozilla::ipc::DocumentRendererNativeIDChild*>(__a);

    nsCOMPtr<nsIWebBrowser> browser = do_QueryInterface(mWebNav);
    if (!browser)
        return true; // silently ignore

    nsCOMPtr<nsIDOMWindow> window;
    if (NS_FAILED(browser->GetContentDOMWindow(getter_AddRefs(window))) ||
        !window)
        return true; // silently ignore

    render->RenderDocument(window, aX, aY, aW, aH, bgcolor, flags, flush,
                           aMatrix, aNativeID);

    gfxRect dirtyArea(0, 0, nsPresContext::AppUnitsToIntCSSPixels(aW),
                      nsPresContext::AppUnitsToIntCSSPixels(aH));

    dirtyArea = aMatrix.Transform(dirtyArea);

    return PDocumentRendererNativeIDChild::Send__delete__(__a, dirtyArea.X(), dirtyArea.Y(),
                                                          dirtyArea.Width(), dirtyArea.Height(),
                                                          aNativeID);
}