C++ gfxMatrix::TransformBounds方法代码示例

/* static */ bool
HwcUtils::PrepareLayerRects(nsIntRect aVisible, const gfxMatrix& aTransform,
                            nsIntRect aClip, nsIntRect aBufferRect,
                            hwc_rect_t* aSourceCrop, hwc_rect_t* aVisibleRegionScreen) {

    gfxRect visibleRect(aVisible);
    gfxRect clip(aClip);
    gfxRect visibleRectScreen = aTransform.TransformBounds(visibleRect);
    // |clip| is guaranteed to be integer
    visibleRectScreen.IntersectRect(visibleRectScreen, clip);

    if (visibleRectScreen.IsEmpty()) {
        LOGD("Skip layer");
        return false;
    }

    gfxMatrix inverse(aTransform);
    inverse.Invert();
    gfxRect crop = inverse.TransformBounds(visibleRectScreen);

    //clip to buffer size
    crop.IntersectRect(crop, aBufferRect);
    crop.Round();

    if (crop.IsEmpty()) {
        LOGD("Skip layer");
        return false;
    }

    //propagate buffer clipping back to visible rect
    visibleRectScreen = aTransform.TransformBounds(crop);
    visibleRectScreen.Round();

    // Map from layer space to buffer space
    crop -= aBufferRect.TopLeft();

    aSourceCrop->left = crop.x;
    aSourceCrop->top  = crop.y;
    aSourceCrop->right  = crop.x + crop.width;
    aSourceCrop->bottom = crop.y + crop.height;

    aVisibleRegionScreen->left = visibleRectScreen.x;
    aVisibleRegionScreen->top  = visibleRectScreen.y;
    aVisibleRegionScreen->right  = visibleRectScreen.x + visibleRectScreen.width;
    aVisibleRegionScreen->bottom = visibleRectScreen.y + visibleRectScreen.height;

    return true;
}

/* static */ bool
HwcUtils::PrepareVisibleRegion(const nsIntRegion& aVisible,
                               const gfxMatrix& aTransform,
                               nsIntRect aClip, nsIntRect aBufferRect,
                               RectVector* aVisibleRegionScreen) {

    nsIntRegionRectIterator rect(aVisible);
    bool isVisible = false;
    while (const nsIntRect* visibleRect = rect.Next()) {
        hwc_rect_t visibleRectScreen;
        gfxRect screenRect;

        screenRect.IntersectRect(gfxRect(*visibleRect), aBufferRect);
        screenRect = aTransform.TransformBounds(screenRect);
        screenRect.IntersectRect(screenRect, aClip);
        screenRect.Round();
        if (screenRect.IsEmpty()) {
            continue;
        }
        visibleRectScreen.left = screenRect.x;
        visibleRectScreen.top  = screenRect.y;
        visibleRectScreen.right  = screenRect.XMost();
        visibleRectScreen.bottom = screenRect.YMost();
        aVisibleRegionScreen->push_back(visibleRectScreen);
        isVisible = true;
    }

    return isVisible;
}

/* static */ bool
HwcUtils::CalculateClipRect(const gfxMatrix& aTransform,
                            const nsIntRect* aLayerClip,
                            nsIntRect aParentClip, nsIntRect* aRenderClip) {

    *aRenderClip = aParentClip;

    if (!aLayerClip) {
        return true;
    }

    if (aLayerClip->IsEmpty()) {
        return false;
    }

    nsIntRect clip = *aLayerClip;

    gfxRect r(clip);
    gfxRect trClip = aTransform.TransformBounds(r);
    trClip.Round();
    gfxUtils::GfxRectToIntRect(trClip, &clip);

    aRenderClip->IntersectRect(*aRenderClip, clip);
    return true;
}

/**
 * Returns the app unit canvas bounds of a userspace rect.
 *
 * @param aToCanvas Transform from userspace to canvas device space.
 */
static nsRect
ToCanvasBounds(const gfxRect &aUserspaceRect,
               const gfxMatrix &aToCanvas,
               const nsPresContext *presContext)
{
  return nsLayoutUtils::RoundGfxRectToAppRect(
                          aToCanvas.TransformBounds(aUserspaceRect),
                          presContext->AppUnitsPerDevPixel());
}

// EXTEND_PAD won't help us here; we have to create a temporary surface to hold
// the subimage of pixels we're allowed to sample.
static already_AddRefed<gfxDrawable>
CreateSamplingRestrictedDrawable(gfxDrawable* aDrawable,
                                 gfxContext* aContext,
                                 const gfxMatrix& aUserSpaceToImageSpace,
                                 const gfxRect& aSourceRect,
                                 const gfxRect& aSubimage,
                                 const gfxImageFormat aFormat)
{
    PROFILER_LABEL("gfxUtils", "CreateSamplingRestricedDrawable");
    gfxRect userSpaceClipExtents = aContext->GetClipExtents();
    // This isn't optimal --- if aContext has a rotation then GetClipExtents
    // will have to do a bounding-box computation, and TransformBounds might
    // too, so we could get a better result if we computed image space clip
    // extents in one go --- but it doesn't really matter and this is easier
    // to understand.
    gfxRect imageSpaceClipExtents =
        aUserSpaceToImageSpace.TransformBounds(userSpaceClipExtents);
    // Inflate by one pixel because bilinear filtering will sample at most
    // one pixel beyond the computed image pixel coordinate.
    imageSpaceClipExtents.Inflate(1.0);

    gfxRect needed = imageSpaceClipExtents.Intersect(aSourceRect);
    needed = needed.Intersect(aSubimage);
    needed.RoundOut();

    // if 'needed' is empty, nothing will be drawn since aFill
    // must be entirely outside the clip region, so it doesn't
    // matter what we do here, but we should avoid trying to
    // create a zero-size surface.
    if (needed.IsEmpty())
        return nullptr;

    nsRefPtr<gfxDrawable> drawable;
    gfxIntSize size(int32_t(needed.Width()), int32_t(needed.Height()));

    nsRefPtr<gfxImageSurface> image = aDrawable->GetAsImageSurface();
    if (image && gfxRect(0, 0, image->GetSize().width, image->GetSize().height).Contains(needed)) {
      nsRefPtr<gfxASurface> temp = image->GetSubimage(needed);
      drawable = new gfxSurfaceDrawable(temp, size, gfxMatrix().Translate(-needed.TopLeft()));
    } else {
      mozilla::RefPtr<mozilla::gfx::DrawTarget> target =
        gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(ToIntSize(size),
                                                                     ImageFormatToSurfaceFormat(aFormat));
      if (!target) {
        return nullptr;
      }

      nsRefPtr<gfxContext> tmpCtx = new gfxContext(target);
      tmpCtx->SetOperator(OptimalFillOperator());
      aDrawable->Draw(tmpCtx, needed - needed.TopLeft(), true,
                      GraphicsFilter::FILTER_FAST, gfxMatrix().Translate(needed.TopLeft()));
      drawable = new gfxSurfaceDrawable(target, size, gfxMatrix().Translate(-needed.TopLeft()));
    }

    return drawable.forget();
}

// EXTEND_PAD won't help us here; we have to create a temporary surface to hold
// the subimage of pixels we're allowed to sample.
static already_AddRefed<gfxDrawable>
CreateSamplingRestrictedDrawable(gfxDrawable* aDrawable,
                                 gfxContext* aContext,
                                 const gfxMatrix& aUserSpaceToImageSpace,
                                 const gfxRect& aSourceRect,
                                 const gfxRect& aSubimage,
                                 const gfxImageSurface::gfxImageFormat aFormat)
{
    SAMPLE_LABEL("gfxUtils", "CreateSamplingRestricedDrawable");
    gfxRect userSpaceClipExtents = aContext->GetClipExtents();
    // This isn't optimal --- if aContext has a rotation then GetClipExtents
    // will have to do a bounding-box computation, and TransformBounds might
    // too, so we could get a better result if we computed image space clip
    // extents in one go --- but it doesn't really matter and this is easier
    // to understand.
    gfxRect imageSpaceClipExtents =
        aUserSpaceToImageSpace.TransformBounds(userSpaceClipExtents);
    // Inflate by one pixel because bilinear filtering will sample at most
    // one pixel beyond the computed image pixel coordinate.
    imageSpaceClipExtents.Inflate(1.0);

    gfxRect needed = imageSpaceClipExtents.Intersect(aSourceRect);
    needed = needed.Intersect(aSubimage);
    needed.RoundOut();

    // if 'needed' is empty, nothing will be drawn since aFill
    // must be entirely outside the clip region, so it doesn't
    // matter what we do here, but we should avoid trying to
    // create a zero-size surface.
    if (needed.IsEmpty())
        return nullptr;

    gfxIntSize size(PRInt32(needed.Width()), PRInt32(needed.Height()));
    nsRefPtr<gfxASurface> temp =
        gfxPlatform::GetPlatform()->CreateOffscreenSurface(size, gfxASurface::ContentFromFormat(aFormat));
    if (!temp || temp->CairoStatus())
        return nullptr;

    nsRefPtr<gfxContext> tmpCtx = new gfxContext(temp);
    tmpCtx->SetOperator(OptimalFillOperator());
    aDrawable->Draw(tmpCtx, needed - needed.TopLeft(), true,
                    gfxPattern::FILTER_FAST, gfxMatrix().Translate(needed.TopLeft()));

    nsRefPtr<gfxPattern> resultPattern = new gfxPattern(temp);
    if (!resultPattern)
        return nullptr;

    nsRefPtr<gfxDrawable> drawable = 
        new gfxSurfaceDrawable(temp, size, gfxMatrix().Translate(-needed.TopLeft()));
    return drawable.forget();
}

static nsIntRect
MapDeviceRectToFilterSpace(const gfxMatrix& aMatrix,
                           const gfxIntSize& aFilterSize,
                           const nsIntRect* aDeviceRect)
{
  nsIntRect rect(0, 0, aFilterSize.width, aFilterSize.height);
  if (aDeviceRect) {
    gfxRect r = aMatrix.TransformBounds(gfxRect(aDeviceRect->x, aDeviceRect->y,
                                                aDeviceRect->width, aDeviceRect->height));
    r.RoundOut();
    nsIntRect intRect;
    if (gfxUtils::GfxRectToIntRect(r, &intRect)) {
      rect = intRect;
    }
  }
  return rect;
}

SVGBBox
nsSVGForeignObjectFrame::GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
                                             PRUint32 aFlags)
{
  nsSVGForeignObjectElement *content =
    static_cast<nsSVGForeignObjectElement*>(mContent);

  float x, y, w, h;
  content->GetAnimatedLengthValues(&x, &y, &w, &h, nsnull);

  if (w < 0.0f) w = 0.0f;
  if (h < 0.0f) h = 0.0f;

  if (aToBBoxUserspace.IsSingular()) {
    // XXX ReportToConsole
    return SVGBBox();
  }
  return aToBBoxUserspace.TransformBounds(gfxRect(0.0, 0.0, w, h));
}

NS_IMETHODIMP
DynamicImage::Draw(gfxContext* aContext,
                   GraphicsFilter aFilter,
                   const gfxMatrix& aUserSpaceToImageSpace,
                   const gfxRect& aFill,
                   const nsIntRect& aSubimage,
                   const nsIntSize& aViewportSize,
                   const SVGImageContext* aSVGContext,
                   uint32_t aWhichFrame,
                   uint32_t aFlags)
{
  gfxIntSize drawableSize(mDrawable->Size());
  gfxRect imageRect(0, 0, drawableSize.width, drawableSize.height);
  gfxRect sourceRect = aUserSpaceToImageSpace.TransformBounds(aFill);

  gfxUtils::DrawPixelSnapped(aContext, mDrawable, aUserSpaceToImageSpace,
                             aSubimage, sourceRect, imageRect, aFill,
                             SurfaceFormat::B8G8R8A8, aFilter, aFlags);

  return NS_OK;
}

gfxRect
nsSVGForeignObjectFrame::GetBBoxContribution(const gfxMatrix &aToBBoxUserspace)
{
  NS_ASSERTION(!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD),
               "Should not be calling this on a non-display child");

  nsSVGForeignObjectElement *content =
    static_cast<nsSVGForeignObjectElement*>(mContent);

  float x, y, w, h;
  content->GetAnimatedLengthValues(&x, &y, &w, &h, nsnull);

  if (w < 0.0f) w = 0.0f;
  if (h < 0.0f) h = 0.0f;

  if (aToBBoxUserspace.IsSingular()) {
    // XXX ReportToConsole
    return gfxRect(0.0, 0.0, 0.0, 0.0);
  }
  return aToBBoxUserspace.TransformBounds(gfxRect(0.0, 0.0, w, h));
}

/**
 * Converts an nsRect that is relative to a filtered frame's origin (i.e. the
 * top-left corner of its border box) into filter space.
 * Returns the entire filter region (a rect the width/height of aFilterRes) if
 * aFrameRect is null, or if the result is too large to be stored in an
 * nsIntRect.
 */
static nsIntRect
MapFrameRectToFilterSpace(const nsRect* aRect,
                          int32_t aAppUnitsPerCSSPx,
                          const gfxMatrix& aFrameSpaceInCSSPxToFilterSpace,
                          const gfxIntSize& aFilterRes)
{
  nsIntRect rect(0, 0, aFilterRes.width, aFilterRes.height);
  if (aRect) {
    if (aRect->IsEmpty()) {
      return nsIntRect();
    }
    gfxRect rectInCSSPx =
      nsLayoutUtils::RectToGfxRect(*aRect, aAppUnitsPerCSSPx);
    gfxRect rectInFilterSpace =
      aFrameSpaceInCSSPxToFilterSpace.TransformBounds(rectInCSSPx);
    rectInFilterSpace.RoundOut();
    nsIntRect intRect;
    if (gfxUtils::GfxRectToIntRect(rectInFilterSpace, &intRect)) {
      rect = intRect;
    }
  }
  return rect;
}

void
CompositorOGL::BeginFrame(const Rect *aClipRectIn, const gfxMatrix& aTransform,
                          const Rect& aRenderBounds, Rect *aClipRectOut,
                          Rect *aRenderBoundsOut)
{
  MOZ_ASSERT(!mFrameInProgress, "frame still in progress (should have called EndFrame or AbortFrame");

  mVBOs.Reset();

  mFrameInProgress = true;
  gfxRect rect;
  if (mUseExternalSurfaceSize) {
    rect = gfxRect(0, 0, mSurfaceSize.width, mSurfaceSize.height);
  } else {
    rect = gfxRect(aRenderBounds.x, aRenderBounds.y, aRenderBounds.width, aRenderBounds.height);
    // If render bounds is not updated explicitly, try to infer it from widget
    if (rect.width == 0 || rect.height == 0) {
      // FIXME/bug XXXXXX this races with rotation changes on the main
      // thread, and undoes all the care we take with layers txns being
      // sent atomically with rotation changes
      nsIntRect intRect;
      mWidget->GetClientBounds(intRect);
      rect = gfxRect(0, 0, intRect.width, intRect.height);
    }
  }

  rect = aTransform.TransformBounds(rect);
  if (aRenderBoundsOut) {
    *aRenderBoundsOut = Rect(rect.x, rect.y, rect.width, rect.height);
  }

  GLint width = rect.width;
  GLint height = rect.height;

  // We can't draw anything to something with no area
  // so just return
  if (width == 0 || height == 0)
    return;

  // If the widget size changed, we have to force a MakeCurrent
  // to make sure that GL sees the updated widget size.
  if (mWidgetSize.width != width ||
      mWidgetSize.height != height)
  {
    MakeCurrent(ForceMakeCurrent);

    mWidgetSize.width = width;
    mWidgetSize.height = height;
  } else {
    MakeCurrent();
  }

#if MOZ_ANDROID_OMTC
  TexturePoolOGL::Fill(gl());
#endif

  mCurrentRenderTarget = CompositingRenderTargetOGL::RenderTargetForWindow(this,
                            IntSize(width, height),
                            aTransform);
  mCurrentRenderTarget->BindRenderTarget();
#ifdef DEBUG
  mWindowRenderTarget = mCurrentRenderTarget;
#endif

  // Default blend function implements "OVER"
  mGLContext->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                 LOCAL_GL_ONE, LOCAL_GL_ONE);
  mGLContext->fEnable(LOCAL_GL_BLEND);

  if (!aClipRectIn) {
    mGLContext->fScissor(0, 0, width, height);
    if (aClipRectOut) {
      aClipRectOut->SetRect(0, 0, width, height);
    }
  } else {
    mGLContext->fScissor(aClipRectIn->x, aClipRectIn->y, aClipRectIn->width, aClipRectIn->height);
  }

  mGLContext->fEnable(LOCAL_GL_SCISSOR_TEST);

  // If the Android compositor is being used, this clear will be done in
  // DrawWindowUnderlay. Make sure the bits used here match up with those used
  // in mobile/android/base/gfx/LayerRenderer.java
#ifndef MOZ_ANDROID_OMTC
  mGLContext->fClearColor(0.0, 0.0, 0.0, 0.0);
  mGLContext->fClear(LOCAL_GL_COLOR_BUFFER_BIT | LOCAL_GL_DEPTH_BUFFER_BIT);
#endif
}