From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 layout/painting/nsImageRenderer.cpp | 1032 +++++++++++++++++++++++++++++++++++
 1 file changed, 1032 insertions(+)
 create mode 100644 layout/painting/nsImageRenderer.cpp

(limited to 'layout/painting/nsImageRenderer.cpp')

diff --git a/layout/painting/nsImageRenderer.cpp b/layout/painting/nsImageRenderer.cpp
new file mode 100644
index 0000000000..845b0b8719
--- /dev/null
+++ b/layout/painting/nsImageRenderer.cpp
@@ -0,0 +1,1032 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* utility code for drawing images as CSS borders, backgrounds, and shapes. */
+
+#include "nsImageRenderer.h"
+
+#include "mozilla/webrender/WebRenderAPI.h"
+
+#include "gfxContext.h"
+#include "gfxDrawable.h"
+#include "ImageOps.h"
+#include "ImageRegion.h"
+#include "mozilla/image/WebRenderImageProvider.h"
+#include "mozilla/layers/RenderRootStateManager.h"
+#include "mozilla/layers/StackingContextHelper.h"
+#include "mozilla/layers/WebRenderLayerManager.h"
+#include "nsContentUtils.h"
+#include "nsCSSRendering.h"
+#include "nsCSSRenderingGradients.h"
+#include "nsDeviceContext.h"
+#include "nsIFrame.h"
+#include "nsLayoutUtils.h"
+#include "nsStyleStructInlines.h"
+#include "mozilla/StaticPrefs_image.h"
+#include "mozilla/ISVGDisplayableFrame.h"
+#include "mozilla/SVGIntegrationUtils.h"
+#include "mozilla/SVGPaintServerFrame.h"
+#include "mozilla/SVGObserverUtils.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+using namespace mozilla::image;
+using namespace mozilla::layers;
+
+nsSize CSSSizeOrRatio::ComputeConcreteSize() const {
+  NS_ASSERTION(CanComputeConcreteSize(), "Cannot compute");
+  if (mHasWidth && mHasHeight) {
+    return nsSize(mWidth, mHeight);
+  }
+  if (mHasWidth) {
+    return nsSize(mWidth, mRatio.Inverted().ApplyTo(mWidth));
+  }
+
+  MOZ_ASSERT(mHasHeight);
+  return nsSize(mRatio.ApplyTo(mHeight), mHeight);
+}
+
+nsImageRenderer::nsImageRenderer(nsIFrame* aForFrame, const StyleImage* aImage,
+                                 uint32_t aFlags)
+    : mForFrame(aForFrame),
+      mImage(&aImage->FinalImage()),
+      mImageResolution(aImage->GetResolution(*aForFrame->Style())),
+      mType(mImage->tag),
+      mImageContainer(nullptr),
+      mGradientData(nullptr),
+      mPaintServerFrame(nullptr),
+      mPrepareResult(ImgDrawResult::NOT_READY),
+      mSize(0, 0),
+      mFlags(aFlags),
+      mExtendMode(ExtendMode::CLAMP),
+      mMaskOp(StyleMaskMode::MatchSource) {}
+
+bool nsImageRenderer::PrepareImage() {
+  if (mImage->IsNone()) {
+    mPrepareResult = ImgDrawResult::BAD_IMAGE;
+    return false;
+  }
+
+  const bool isImageRequest = mImage->IsImageRequestType();
+  MOZ_ASSERT_IF(!isImageRequest, !mImage->GetImageRequest());
+  imgRequestProxy* request = nullptr;
+  if (isImageRequest) {
+    request = mImage->GetImageRequest();
+    if (!request) {
+      // request could be null here if the StyleImage refused
+      // to load a same-document URL, or the url was invalid, for example.
+      mPrepareResult = ImgDrawResult::BAD_IMAGE;
+      return false;
+    }
+  }
+
+  if (!mImage->IsComplete()) {
+    MOZ_DIAGNOSTIC_ASSERT(isImageRequest);
+
+    // Make sure the image is actually decoding.
+    bool frameComplete = request->StartDecodingWithResult(
+        imgIContainer::FLAG_ASYNC_NOTIFY |
+        imgIContainer::FLAG_AVOID_REDECODE_FOR_SIZE);
+
+    // Boost the loading priority since we know we want to draw the image.
+    if (mFlags & nsImageRenderer::FLAG_PAINTING_TO_WINDOW) {
+      request->BoostPriority(imgIRequest::CATEGORY_DISPLAY);
+    }
+
+    // Check again to see if we finished.
+    // We cannot prepare the image for rendering if it is not fully loaded.
+    if (!frameComplete && !mImage->IsComplete()) {
+      uint32_t imageStatus = 0;
+      request->GetImageStatus(&imageStatus);
+      if (imageStatus & imgIRequest::STATUS_ERROR) {
+        mPrepareResult = ImgDrawResult::BAD_IMAGE;
+        return false;
+      }
+
+      // If not errored, and we requested a sync decode, and the image has
+      // loaded, push on through because the Draw() will do a sync decode then.
+      const bool syncDecodeWillComplete =
+          (mFlags & FLAG_SYNC_DECODE_IMAGES) &&
+          (imageStatus & imgIRequest::STATUS_LOAD_COMPLETE);
+
+      bool canDrawPartial =
+          (mFlags & nsImageRenderer::FLAG_DRAW_PARTIAL_FRAMES) &&
+          isImageRequest && mImage->IsSizeAvailable();
+
+      // If we are drawing a partial frame then we want to make sure there are
+      // some pixels to draw, otherwise we waste effort pushing through to draw
+      // nothing.
+      if (!syncDecodeWillComplete && canDrawPartial) {
+        nsCOMPtr<imgIContainer> image;
+        canDrawPartial =
+            canDrawPartial &&
+            NS_SUCCEEDED(request->GetImage(getter_AddRefs(image))) && image &&
+            image->GetType() == imgIContainer::TYPE_RASTER &&
+            image->HasDecodedPixels();
+      }
+
+      // If we can draw partial then proceed if we at least have the size
+      // available.
+      if (!(syncDecodeWillComplete || canDrawPartial)) {
+        mPrepareResult = ImgDrawResult::NOT_READY;
+        return false;
+      }
+    }
+  }
+
+  if (isImageRequest) {
+    nsCOMPtr<imgIContainer> srcImage;
+    nsresult rv = request->GetImage(getter_AddRefs(srcImage));
+    MOZ_ASSERT(NS_SUCCEEDED(rv) && srcImage,
+               "If GetImage() is failing, mImage->IsComplete() "
+               "should have returned false");
+    if (!NS_SUCCEEDED(rv)) {
+      srcImage = nullptr;
+    }
+
+    if (srcImage) {
+      StyleImageOrientation orientation =
+          mForFrame->StyleVisibility()->UsedImageOrientation(request);
+      srcImage = nsLayoutUtils::OrientImage(srcImage, orientation);
+    }
+
+    mImageContainer.swap(srcImage);
+    mPrepareResult = ImgDrawResult::SUCCESS;
+  } else if (mImage->IsGradient()) {
+    mGradientData = &*mImage->AsGradient();
+    mPrepareResult = ImgDrawResult::SUCCESS;
+  } else if (mImage->IsElement()) {
+    dom::Element* paintElement =  // may be null
+        SVGObserverUtils::GetAndObserveBackgroundImage(
+            mForFrame->FirstContinuation(), mImage->AsElement().AsAtom());
+    // If the referenced element is an <img>, <canvas>, or <video> element,
+    // prefer SurfaceFromElement as it's more reliable.
+    mImageElementSurface = nsLayoutUtils::SurfaceFromElement(paintElement);
+
+    if (!mImageElementSurface.GetSourceSurface()) {
+      nsIFrame* paintServerFrame =
+          paintElement ? paintElement->GetPrimaryFrame() : nullptr;
+      // If there's no referenced frame, or the referenced frame is
+      // non-displayable SVG, then we have nothing valid to paint.
+      if (!paintServerFrame || (paintServerFrame->IsSVGFrame() &&
+                                !static_cast<SVGPaintServerFrame*>(
+                                    do_QueryFrame(paintServerFrame)) &&
+                                !static_cast<ISVGDisplayableFrame*>(
+                                    do_QueryFrame(paintServerFrame)))) {
+        mPrepareResult = ImgDrawResult::BAD_IMAGE;
+        return false;
+      }
+      mPaintServerFrame = paintServerFrame;
+    }
+
+    mPrepareResult = ImgDrawResult::SUCCESS;
+  } else if (mImage->IsCrossFade()) {
+    // See bug 546052 - cross-fade implementation still being worked
+    // on.
+    mPrepareResult = ImgDrawResult::BAD_IMAGE;
+    return false;
+  } else {
+    MOZ_ASSERT(mImage->IsNone(), "Unknown image type?");
+  }
+
+  return IsReady();
+}
+
+CSSSizeOrRatio nsImageRenderer::ComputeIntrinsicSize() {
+  NS_ASSERTION(IsReady(),
+               "Ensure PrepareImage() has returned true "
+               "before calling me");
+
+  CSSSizeOrRatio result;
+  switch (mType) {
+    case StyleImage::Tag::Url: {
+      bool haveWidth, haveHeight;
+      CSSIntSize imageIntSize;
+      nsLayoutUtils::ComputeSizeForDrawing(mImageContainer, mImageResolution,
+                                           imageIntSize, result.mRatio,
+                                           haveWidth, haveHeight);
+      if (haveWidth) {
+        result.SetWidth(CSSPixel::ToAppUnits(imageIntSize.width));
+      }
+      if (haveHeight) {
+        result.SetHeight(CSSPixel::ToAppUnits(imageIntSize.height));
+      }
+
+      // If we know the aspect ratio and one of the dimensions,
+      // we can compute the other missing width or height.
+      if (!haveHeight && haveWidth && result.mRatio) {
+        CSSIntCoord intrinsicHeight =
+            result.mRatio.Inverted().ApplyTo(imageIntSize.width);
+        result.SetHeight(nsPresContext::CSSPixelsToAppUnits(intrinsicHeight));
+      } else if (haveHeight && !haveWidth && result.mRatio) {
+        CSSIntCoord intrinsicWidth = result.mRatio.ApplyTo(imageIntSize.height);
+        result.SetWidth(nsPresContext::CSSPixelsToAppUnits(intrinsicWidth));
+      }
+
+      break;
+    }
+    case StyleImage::Tag::Element: {
+      // XXX element() should have the width/height of the referenced element,
+      //     and that element's ratio, if it matches.  If it doesn't match, it
+      //     should have no width/height or ratio.  See element() in CSS images:
+      //     <http://dev.w3.org/csswg/css-images-4/#element-notation>.
+      //     Make sure to change nsStyleImageLayers::Size::DependsOnFrameSize
+      //     when fixing this!
+      if (mPaintServerFrame) {
+        // SVG images have no intrinsic size
+        if (!mPaintServerFrame->IsSVGFrame()) {
+          // The intrinsic image size for a generic nsIFrame paint server is
+          // the union of the border-box rects of all of its continuations,
+          // rounded to device pixels.
+          int32_t appUnitsPerDevPixel =
+              mForFrame->PresContext()->AppUnitsPerDevPixel();
+          result.SetSize(IntSizeToAppUnits(
+              SVGIntegrationUtils::GetContinuationUnionSize(mPaintServerFrame)
+                  .ToNearestPixels(appUnitsPerDevPixel),
+              appUnitsPerDevPixel));
+        }
+      } else {
+        NS_ASSERTION(mImageElementSurface.GetSourceSurface(),
+                     "Surface should be ready.");
+        IntSize surfaceSize = mImageElementSurface.mSize;
+        result.SetSize(
+            nsSize(nsPresContext::CSSPixelsToAppUnits(surfaceSize.width),
+                   nsPresContext::CSSPixelsToAppUnits(surfaceSize.height)));
+      }
+      break;
+    }
+    case StyleImage::Tag::ImageSet:
+      MOZ_FALLTHROUGH_ASSERT("image-set should be resolved already");
+    // Bug 546052 cross-fade not yet implemented.
+    case StyleImage::Tag::CrossFade:
+    // Per <http://dev.w3.org/csswg/css3-images/#gradients>, gradients have no
+    // intrinsic dimensions.
+    case StyleImage::Tag::Gradient:
+    case StyleImage::Tag::None:
+      break;
+  }
+
+  return result;
+}
+
+/* static */
+nsSize nsImageRenderer::ComputeConcreteSize(
+    const CSSSizeOrRatio& aSpecifiedSize, const CSSSizeOrRatio& aIntrinsicSize,
+    const nsSize& aDefaultSize) {
+  // The specified size is fully specified, just use that
+  if (aSpecifiedSize.IsConcrete()) {
+    return aSpecifiedSize.ComputeConcreteSize();
+  }
+
+  MOZ_ASSERT(!aSpecifiedSize.mHasWidth || !aSpecifiedSize.mHasHeight);
+
+  if (!aSpecifiedSize.mHasWidth && !aSpecifiedSize.mHasHeight) {
+    // no specified size, try using the intrinsic size
+    if (aIntrinsicSize.CanComputeConcreteSize()) {
+      return aIntrinsicSize.ComputeConcreteSize();
+    }
+
+    if (aIntrinsicSize.mHasWidth) {
+      return nsSize(aIntrinsicSize.mWidth, aDefaultSize.height);
+    }
+    if (aIntrinsicSize.mHasHeight) {
+      return nsSize(aDefaultSize.width, aIntrinsicSize.mHeight);
+    }
+
+    // couldn't use the intrinsic size either, revert to using the default size
+    return ComputeConstrainedSize(aDefaultSize, aIntrinsicSize.mRatio, CONTAIN);
+  }
+
+  MOZ_ASSERT(aSpecifiedSize.mHasWidth || aSpecifiedSize.mHasHeight);
+
+  // The specified height is partial, try to compute the missing part.
+  if (aSpecifiedSize.mHasWidth) {
+    nscoord height;
+    if (aIntrinsicSize.HasRatio()) {
+      height = aIntrinsicSize.mRatio.Inverted().ApplyTo(aSpecifiedSize.mWidth);
+    } else if (aIntrinsicSize.mHasHeight) {
+      height = aIntrinsicSize.mHeight;
+    } else {
+      height = aDefaultSize.height;
+    }
+    return nsSize(aSpecifiedSize.mWidth, height);
+  }
+
+  MOZ_ASSERT(aSpecifiedSize.mHasHeight);
+  nscoord width;
+  if (aIntrinsicSize.HasRatio()) {
+    width = aIntrinsicSize.mRatio.ApplyTo(aSpecifiedSize.mHeight);
+  } else if (aIntrinsicSize.mHasWidth) {
+    width = aIntrinsicSize.mWidth;
+  } else {
+    width = aDefaultSize.width;
+  }
+  return nsSize(width, aSpecifiedSize.mHeight);
+}
+
+/* static */
+nsSize nsImageRenderer::ComputeConstrainedSize(
+    const nsSize& aConstrainingSize, const AspectRatio& aIntrinsicRatio,
+    FitType aFitType) {
+  if (!aIntrinsicRatio) {
+    return aConstrainingSize;
+  }
+
+  // Suppose we're doing a "contain" fit. If the image's aspect ratio has a
+  // "fatter" shape than the constraint area, then we need to use the
+  // constraint area's full width, and we need to use the aspect ratio to
+  // produce a height. On the other hand, if the aspect ratio is "skinnier", we
+  // use the constraint area's full height, and we use the aspect ratio to
+  // produce a width. (If instead we're doing a "cover" fit, then it can easily
+  // be seen that we should do precisely the opposite.)
+  //
+  // We check if the image's aspect ratio is "fatter" than the constraint area
+  // by simply applying the aspect ratio to the constraint area's height, to
+  // produce a "hypothetical width", and we check whether that
+  // aspect-ratio-provided "hypothetical width" is wider than the constraint
+  // area's actual width. If it is, then the aspect ratio is fatter than the
+  // constraint area.
+  //
+  // This is equivalent to the more descriptive alternative:
+  //
+  //   AspectRatio::FromSize(aConstrainingSize) < aIntrinsicRatio
+  //
+  // But gracefully handling the case where one of the two dimensions from
+  // aConstrainingSize is zero. This is easy to prove since:
+  //
+  //   aConstrainingSize.width / aConstrainingSize.height < aIntrinsicRatio
+  //
+  // Is trivially equivalent to:
+  //
+  //   aIntrinsicRatio.width < aIntrinsicRatio * aConstrainingSize.height
+  //
+  // For the cases where height is not zero.
+  //
+  // We use float math here to avoid losing precision for very large backgrounds
+  // since we use saturating nscoord math otherwise.
+  const float constraintWidth = float(aConstrainingSize.width);
+  const float hypotheticalWidth =
+      aIntrinsicRatio.ApplyToFloat(aConstrainingSize.height);
+
+  nsSize size;
+  if ((aFitType == CONTAIN) == (constraintWidth < hypotheticalWidth)) {
+    size.width = aConstrainingSize.width;
+    size.height = aIntrinsicRatio.Inverted().ApplyTo(aConstrainingSize.width);
+    // If we're reducing the size by less than one css pixel, then just use the
+    // constraining size.
+    if (aFitType == CONTAIN &&
+        aConstrainingSize.height - size.height < AppUnitsPerCSSPixel()) {
+      size.height = aConstrainingSize.height;
+    }
+  } else {
+    size.height = aConstrainingSize.height;
+    size.width = aIntrinsicRatio.ApplyTo(aConstrainingSize.height);
+    if (aFitType == CONTAIN &&
+        aConstrainingSize.width - size.width < AppUnitsPerCSSPixel()) {
+      size.width = aConstrainingSize.width;
+    }
+  }
+  return size;
+}
+
+/**
+ * mSize is the image's "preferred" size for this particular rendering, while
+ * the drawn (aka concrete) size is the actual rendered size after accounting
+ * for background-size etc..  The preferred size is most often the image's
+ * intrinsic dimensions.  But for images with incomplete intrinsic dimensions,
+ * the preferred size varies, depending on the specified and default sizes, see
+ * nsImageRenderer::Compute*Size.
+ *
+ * This distinction is necessary because the components of a vector image are
+ * specified with respect to its preferred size for a rendering situation, not
+ * to its actual rendered size.  For example, consider a 4px wide background
+ * vector image with no height which contains a left-aligned
+ * 2px wide black rectangle with height 100%.  If the background-size width is
+ * auto (or 4px), the vector image will render 4px wide, and the black rectangle
+ * will be 2px wide.  If the background-size width is 8px, the vector image will
+ * render 8px wide, and the black rectangle will be 4px wide -- *not* 2px wide.
+ * In both cases mSize.width will be 4px; but in the first case the returned
+ * width will be 4px, while in the second case the returned width will be 8px.
+ */
+void nsImageRenderer::SetPreferredSize(const CSSSizeOrRatio& aIntrinsicSize,
+                                       const nsSize& aDefaultSize) {
+  mSize.width =
+      aIntrinsicSize.mHasWidth ? aIntrinsicSize.mWidth : aDefaultSize.width;
+  mSize.height =
+      aIntrinsicSize.mHasHeight ? aIntrinsicSize.mHeight : aDefaultSize.height;
+}
+
+// Convert from nsImageRenderer flags to the flags we want to use for drawing in
+// the imgIContainer namespace.
+static uint32_t ConvertImageRendererToDrawFlags(uint32_t aImageRendererFlags) {
+  uint32_t drawFlags = imgIContainer::FLAG_ASYNC_NOTIFY;
+  if (aImageRendererFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
+    drawFlags |= imgIContainer::FLAG_SYNC_DECODE;
+  } else {
+    drawFlags |= imgIContainer::FLAG_SYNC_DECODE_IF_FAST;
+  }
+  if (aImageRendererFlags & (nsImageRenderer::FLAG_PAINTING_TO_WINDOW |
+                             nsImageRenderer::FLAG_HIGH_QUALITY_SCALING)) {
+    drawFlags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
+  }
+  return drawFlags;
+}
+
+ImgDrawResult nsImageRenderer::Draw(nsPresContext* aPresContext,
+                                    gfxContext& aRenderingContext,
+                                    const nsRect& aDirtyRect,
+                                    const nsRect& aDest, const nsRect& aFill,
+                                    const nsPoint& aAnchor,
+                                    const nsSize& aRepeatSize,
+                                    const CSSIntRect& aSrc, float aOpacity) {
+  if (!IsReady()) {
+    MOZ_ASSERT_UNREACHABLE(
+        "Ensure PrepareImage() has returned true before "
+        "calling me");
+    return ImgDrawResult::TEMPORARY_ERROR;
+  }
+
+  if (aDest.IsEmpty() || aFill.IsEmpty() || mSize.width <= 0 ||
+      mSize.height <= 0) {
+    return ImgDrawResult::SUCCESS;
+  }
+
+  SamplingFilter samplingFilter =
+      nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
+  ImgDrawResult result = ImgDrawResult::SUCCESS;
+  gfxContext* ctx = &aRenderingContext;
+  Maybe<gfxContext> tempCtx;
+  IntRect tmpDTRect;
+
+  if (ctx->CurrentOp() != CompositionOp::OP_OVER ||
+      mMaskOp == StyleMaskMode::Luminance) {
+    gfxRect clipRect = ctx->GetClipExtents(gfxContext::eDeviceSpace);
+    tmpDTRect = RoundedOut(ToRect(clipRect));
+    if (tmpDTRect.IsEmpty()) {
+      return ImgDrawResult::SUCCESS;
+    }
+    RefPtr<DrawTarget> tempDT = ctx->GetDrawTarget()->CreateSimilarDrawTarget(
+        tmpDTRect.Size(), SurfaceFormat::B8G8R8A8);
+    if (!tempDT || !tempDT->IsValid()) {
+      gfxDevCrash(LogReason::InvalidContext)
+          << "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
+      return ImgDrawResult::TEMPORARY_ERROR;
+    }
+    tempDT->SetTransform(ctx->GetDrawTarget()->GetTransform() *
+                         Matrix::Translation(-tmpDTRect.TopLeft()));
+    tempCtx.emplace(tempDT, /* aPreserveTransform */ true);
+    ctx = &tempCtx.ref();
+    if (!ctx) {
+      gfxDevCrash(LogReason::InvalidContext)
+          << "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
+      return ImgDrawResult::TEMPORARY_ERROR;
+    }
+  }
+
+  switch (mType) {
+    case StyleImage::Tag::Url: {
+      result = nsLayoutUtils::DrawBackgroundImage(
+          *ctx, mForFrame, aPresContext, mImageContainer, samplingFilter, aDest,
+          aFill, aRepeatSize, aAnchor, aDirtyRect,
+          ConvertImageRendererToDrawFlags(mFlags), mExtendMode, aOpacity);
+      break;
+    }
+    case StyleImage::Tag::Gradient: {
+      nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
+          aPresContext, mForFrame->Style(), *mGradientData, mSize);
+
+      renderer.Paint(*ctx, aDest, aFill, aRepeatSize, aSrc, aDirtyRect,
+                     aOpacity);
+      break;
+    }
+    case StyleImage::Tag::Element: {
+      RefPtr<gfxDrawable> drawable = DrawableForElement(aDest, *ctx);
+      if (!drawable) {
+        NS_WARNING("Could not create drawable for element");
+        return ImgDrawResult::TEMPORARY_ERROR;
+      }
+
+      nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
+      result = nsLayoutUtils::DrawImage(
+          *ctx, mForFrame->Style(), aPresContext, image, samplingFilter, aDest,
+          aFill, aAnchor, aDirtyRect, ConvertImageRendererToDrawFlags(mFlags),
+          aOpacity);
+      break;
+    }
+    case StyleImage::Tag::ImageSet:
+      MOZ_FALLTHROUGH_ASSERT("image-set should be resolved already");
+    // See bug 546052 - cross-fade implementation still being worked
+    // on.
+    case StyleImage::Tag::CrossFade:
+    case StyleImage::Tag::None:
+      break;
+  }
+
+  if (!tmpDTRect.IsEmpty()) {
+    DrawTarget* dt = aRenderingContext.GetDrawTarget();
+    Matrix oldTransform = dt->GetTransform();
+    dt->SetTransform(Matrix());
+    if (mMaskOp == StyleMaskMode::Luminance) {
+      RefPtr<SourceSurface> surf = ctx->GetDrawTarget()->IntoLuminanceSource(
+          LuminanceType::LUMINANCE, 1.0f);
+      dt->MaskSurface(ColorPattern(DeviceColor(0, 0, 0, 1.0f)), surf,
+                      tmpDTRect.TopLeft(),
+                      DrawOptions(1.0f, aRenderingContext.CurrentOp()));
+    } else {
+      RefPtr<SourceSurface> surf = ctx->GetDrawTarget()->Snapshot();
+      dt->DrawSurface(
+          surf,
+          Rect(tmpDTRect.x, tmpDTRect.y, tmpDTRect.width, tmpDTRect.height),
+          Rect(0, 0, tmpDTRect.width, tmpDTRect.height),
+          DrawSurfaceOptions(SamplingFilter::POINT),
+          DrawOptions(1.0f, aRenderingContext.CurrentOp()));
+    }
+
+    dt->SetTransform(oldTransform);
+  }
+
+  if (!mImage->IsComplete()) {
+    result &= ImgDrawResult::SUCCESS_NOT_COMPLETE;
+  }
+
+  return result;
+}
+
+ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
+    nsPresContext* aPresContext, mozilla::wr::DisplayListBuilder& aBuilder,
+    mozilla::wr::IpcResourceUpdateQueue& aResources,
+    const mozilla::layers::StackingContextHelper& aSc,
+    mozilla::layers::RenderRootStateManager* aManager, nsDisplayItem* aItem,
+    const nsRect& aDirtyRect, const nsRect& aDest, const nsRect& aFill,
+    const nsPoint& aAnchor, const nsSize& aRepeatSize, const CSSIntRect& aSrc,
+    float aOpacity) {
+  if (!IsReady()) {
+    MOZ_ASSERT_UNREACHABLE(
+        "Ensure PrepareImage() has returned true before "
+        "calling me");
+    return ImgDrawResult::NOT_READY;
+  }
+
+  if (aDest.IsEmpty() || aFill.IsEmpty() || mSize.width <= 0 ||
+      mSize.height <= 0) {
+    return ImgDrawResult::SUCCESS;
+  }
+
+  ImgDrawResult drawResult = ImgDrawResult::SUCCESS;
+  switch (mType) {
+    case StyleImage::Tag::Gradient: {
+      nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
+          aPresContext, mForFrame->Style(), *mGradientData, mSize);
+
+      renderer.BuildWebRenderDisplayItems(aBuilder, aSc, aDest, aFill,
+                                          aRepeatSize, aSrc,
+                                          !aItem->BackfaceIsHidden(), aOpacity);
+      break;
+    }
+    case StyleImage::Tag::Url: {
+      ExtendMode extendMode = mExtendMode;
+      if (aDest.Contains(aFill)) {
+        extendMode = ExtendMode::CLAMP;
+      }
+
+      uint32_t containerFlags = ConvertImageRendererToDrawFlags(mFlags);
+      if (extendMode == ExtendMode::CLAMP &&
+          StaticPrefs::image_svg_blob_image() &&
+          mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
+        containerFlags |= imgIContainer::FLAG_RECORD_BLOB;
+      }
+
+      CSSIntSize destCSSSize{
+          nsPresContext::AppUnitsToIntCSSPixels(aDest.width),
+          nsPresContext::AppUnitsToIntCSSPixels(aDest.height)};
+
+      SVGImageContext svgContext(Some(destCSSSize));
+      Maybe<ImageIntRegion> region;
+
+      const int32_t appUnitsPerDevPixel =
+          mForFrame->PresContext()->AppUnitsPerDevPixel();
+      LayoutDeviceRect destRect =
+          LayoutDeviceRect::FromAppUnits(aDest, appUnitsPerDevPixel);
+      LayoutDeviceRect clipRect =
+          LayoutDeviceRect::FromAppUnits(aFill, appUnitsPerDevPixel);
+      auto stretchSize = wr::ToLayoutSize(destRect.Size());
+
+      gfx::IntSize decodeSize =
+          nsLayoutUtils::ComputeImageContainerDrawingParameters(
+              mImageContainer, mForFrame, destRect, clipRect, aSc,
+              containerFlags, svgContext, region);
+
+      RefPtr<image::WebRenderImageProvider> provider;
+      drawResult = mImageContainer->GetImageProvider(
+          aManager->LayerManager(), decodeSize, svgContext, region,
+          containerFlags, getter_AddRefs(provider));
+
+      Maybe<wr::ImageKey> key =
+          aManager->CommandBuilder().CreateImageProviderKey(
+              aItem, provider, drawResult, aResources);
+      if (key.isNothing()) {
+        break;
+      }
+
+      auto rendering =
+          wr::ToImageRendering(aItem->Frame()->UsedImageRendering());
+      wr::LayoutRect clip = wr::ToLayoutRect(clipRect);
+
+      // If we provided a region to the provider, then it already took the
+      // dest rect into account when it did the recording.
+      wr::LayoutRect dest = region ? clip : wr::ToLayoutRect(destRect);
+
+      if (extendMode == ExtendMode::CLAMP) {
+        // The image is not repeating. Just push as a regular image.
+        aBuilder.PushImage(dest, clip, !aItem->BackfaceIsHidden(), false,
+                           rendering, key.value(), true,
+                           wr::ColorF{1.0f, 1.0f, 1.0f, aOpacity});
+      } else {
+        nsPoint firstTilePos = nsLayoutUtils::GetBackgroundFirstTilePos(
+            aDest.TopLeft(), aFill.TopLeft(), aRepeatSize);
+        LayoutDeviceRect fillRect = LayoutDeviceRect::FromAppUnits(
+            nsRect(firstTilePos.x, firstTilePos.y,
+                   aFill.XMost() - firstTilePos.x,
+                   aFill.YMost() - firstTilePos.y),
+            appUnitsPerDevPixel);
+        wr::LayoutRect fill = wr::ToLayoutRect(fillRect);
+
+        switch (extendMode) {
+          case ExtendMode::REPEAT_Y:
+            fill.min.x = dest.min.x;
+            fill.max.x = dest.max.x;
+            stretchSize.width = dest.width();
+            break;
+          case ExtendMode::REPEAT_X:
+            fill.min.y = dest.min.y;
+            fill.max.y = dest.max.y;
+            stretchSize.height = dest.height();
+            break;
+          default:
+            break;
+        }
+
+        LayoutDeviceSize gapSize = LayoutDeviceSize::FromAppUnits(
+            aRepeatSize - aDest.Size(), appUnitsPerDevPixel);
+
+        aBuilder.PushRepeatingImage(fill, clip, !aItem->BackfaceIsHidden(),
+                                    stretchSize, wr::ToLayoutSize(gapSize),
+                                    rendering, key.value(), true,
+                                    wr::ColorF{1.0f, 1.0f, 1.0f, aOpacity});
+      }
+      break;
+    }
+    default:
+      break;
+  }
+
+  if (!mImage->IsComplete() && drawResult == ImgDrawResult::SUCCESS) {
+    return ImgDrawResult::SUCCESS_NOT_COMPLETE;
+  }
+  return drawResult;
+}
+
+already_AddRefed<gfxDrawable> nsImageRenderer::DrawableForElement(
+    const nsRect& aImageRect, gfxContext& aContext) {
+  NS_ASSERTION(mType == StyleImage::Tag::Element,
+               "DrawableForElement only makes sense if backed by an element");
+  if (mPaintServerFrame) {
+    // XXX(seth): In order to not pass FLAG_SYNC_DECODE_IMAGES here,
+    // DrawableFromPaintServer would have to return a ImgDrawResult indicating
+    // whether any images could not be painted because they weren't fully
+    // decoded. Even always passing FLAG_SYNC_DECODE_IMAGES won't eliminate all
+    // problems, as it won't help if there are image which haven't finished
+    // loading, but it's better than nothing.
+    int32_t appUnitsPerDevPixel =
+        mForFrame->PresContext()->AppUnitsPerDevPixel();
+    nsRect destRect = aImageRect - aImageRect.TopLeft();
+    nsIntSize roundedOut = destRect.ToOutsidePixels(appUnitsPerDevPixel).Size();
+    IntSize imageSize(roundedOut.width, roundedOut.height);
+
+    RefPtr<gfxDrawable> drawable;
+
+    SurfaceFormat format = aContext.GetDrawTarget()->GetFormat();
+    // Don't allow creating images that are too big
+    if (aContext.GetDrawTarget()->CanCreateSimilarDrawTarget(imageSize,
+                                                             format)) {
+      drawable = SVGIntegrationUtils::DrawableFromPaintServer(
+          mPaintServerFrame, mForFrame, mSize, imageSize,
+          aContext.GetDrawTarget(), aContext.CurrentMatrixDouble(),
+          SVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES);
+    }
+
+    return drawable.forget();
+  }
+  NS_ASSERTION(mImageElementSurface.GetSourceSurface(),
+               "Surface should be ready.");
+  RefPtr<gfxDrawable> drawable =
+      new gfxSurfaceDrawable(mImageElementSurface.GetSourceSurface().get(),
+                             mImageElementSurface.mSize);
+  return drawable.forget();
+}
+
+ImgDrawResult nsImageRenderer::DrawLayer(
+    nsPresContext* aPresContext, gfxContext& aRenderingContext,
+    const nsRect& aDest, const nsRect& aFill, const nsPoint& aAnchor,
+    const nsRect& aDirty, const nsSize& aRepeatSize, float aOpacity) {
+  if (!IsReady()) {
+    MOZ_ASSERT_UNREACHABLE(
+        "Ensure PrepareImage() has returned true before "
+        "calling me");
+    return ImgDrawResult::TEMPORARY_ERROR;
+  }
+
+  if (aDest.IsEmpty() || aFill.IsEmpty() || mSize.width <= 0 ||
+      mSize.height <= 0) {
+    return ImgDrawResult::SUCCESS;
+  }
+
+  return Draw(
+      aPresContext, aRenderingContext, aDirty, aDest, aFill, aAnchor,
+      aRepeatSize,
+      CSSIntRect(0, 0, nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
+                 nsPresContext::AppUnitsToIntCSSPixels(mSize.height)),
+      aOpacity);
+}
+
+ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItemsForLayer(
+    nsPresContext* aPresContext, mozilla::wr::DisplayListBuilder& aBuilder,
+    mozilla::wr::IpcResourceUpdateQueue& aResources,
+    const mozilla::layers::StackingContextHelper& aSc,
+    mozilla::layers::RenderRootStateManager* aManager, nsDisplayItem* aItem,
+    const nsRect& aDest, const nsRect& aFill, const nsPoint& aAnchor,
+    const nsRect& aDirty, const nsSize& aRepeatSize, float aOpacity) {
+  if (!IsReady()) {
+    MOZ_ASSERT_UNREACHABLE(
+        "Ensure PrepareImage() has returned true before "
+        "calling me");
+    return mPrepareResult;
+  }
+
+  CSSIntRect srcRect(0, 0, nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
+                     nsPresContext::AppUnitsToIntCSSPixels(mSize.height));
+
+  if (aDest.IsEmpty() || aFill.IsEmpty() || srcRect.IsEmpty()) {
+    return ImgDrawResult::SUCCESS;
+  }
+  return BuildWebRenderDisplayItems(aPresContext, aBuilder, aResources, aSc,
+                                    aManager, aItem, aDirty, aDest, aFill,
+                                    aAnchor, aRepeatSize, srcRect, aOpacity);
+}
+
+/**
+ * Compute the size and position of the master copy of the image. I.e., a single
+ * tile used to fill the dest rect.
+ * aFill The destination rect to be filled
+ * aHFill and aVFill are the repeat patterns for the component -
+ * StyleBorderImageRepeat - i.e., how a tiling unit is used to fill aFill
+ * aUnitSize The size of the source rect in dest coords.
+ */
+static nsRect ComputeTile(nsRect& aFill, StyleBorderImageRepeat aHFill,
+                          StyleBorderImageRepeat aVFill,
+                          const nsSize& aUnitSize, nsSize& aRepeatSize) {
+  nsRect tile;
+  switch (aHFill) {
+    case StyleBorderImageRepeat::Stretch:
+      tile.x = aFill.x;
+      tile.width = aFill.width;
+      aRepeatSize.width = tile.width;
+      break;
+    case StyleBorderImageRepeat::Repeat:
+      tile.x = aFill.x + aFill.width / 2 - aUnitSize.width / 2;
+      tile.width = aUnitSize.width;
+      aRepeatSize.width = tile.width;
+      break;
+    case StyleBorderImageRepeat::Round:
+      tile.x = aFill.x;
+      tile.width =
+          nsCSSRendering::ComputeRoundedSize(aUnitSize.width, aFill.width);
+      aRepeatSize.width = tile.width;
+      break;
+    case StyleBorderImageRepeat::Space: {
+      nscoord space;
+      aRepeatSize.width = nsCSSRendering::ComputeBorderSpacedRepeatSize(
+          aUnitSize.width, aFill.width, space);
+      tile.x = aFill.x + space;
+      tile.width = aUnitSize.width;
+      aFill.x = tile.x;
+      aFill.width = aFill.width - space * 2;
+    } break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("unrecognized border-image fill style");
+  }
+
+  switch (aVFill) {
+    case StyleBorderImageRepeat::Stretch:
+      tile.y = aFill.y;
+      tile.height = aFill.height;
+      aRepeatSize.height = tile.height;
+      break;
+    case StyleBorderImageRepeat::Repeat:
+      tile.y = aFill.y + aFill.height / 2 - aUnitSize.height / 2;
+      tile.height = aUnitSize.height;
+      aRepeatSize.height = tile.height;
+      break;
+    case StyleBorderImageRepeat::Round:
+      tile.y = aFill.y;
+      tile.height =
+          nsCSSRendering::ComputeRoundedSize(aUnitSize.height, aFill.height);
+      aRepeatSize.height = tile.height;
+      break;
+    case StyleBorderImageRepeat::Space: {
+      nscoord space;
+      aRepeatSize.height = nsCSSRendering::ComputeBorderSpacedRepeatSize(
+          aUnitSize.height, aFill.height, space);
+      tile.y = aFill.y + space;
+      tile.height = aUnitSize.height;
+      aFill.y = tile.y;
+      aFill.height = aFill.height - space * 2;
+    } break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("unrecognized border-image fill style");
+  }
+
+  return tile;
+}
+
+/**
+ * Returns true if the given set of arguments will require the tiles which fill
+ * the dest rect to be scaled from the source tile. See comment on ComputeTile
+ * for argument descriptions.
+ */
+static bool RequiresScaling(const nsRect& aFill, StyleBorderImageRepeat aHFill,
+                            StyleBorderImageRepeat aVFill,
+                            const nsSize& aUnitSize) {
+  // If we have no tiling in either direction, we can skip the intermediate
+  // scaling step.
+  return (aHFill != StyleBorderImageRepeat::Stretch ||
+          aVFill != StyleBorderImageRepeat::Stretch) &&
+         (aUnitSize.width != aFill.width || aUnitSize.height != aFill.height);
+}
+
+ImgDrawResult nsImageRenderer::DrawBorderImageComponent(
+    nsPresContext* aPresContext, gfxContext& aRenderingContext,
+    const nsRect& aDirtyRect, const nsRect& aFill, const CSSIntRect& aSrc,
+    StyleBorderImageRepeat aHFill, StyleBorderImageRepeat aVFill,
+    const nsSize& aUnitSize, uint8_t aIndex,
+    const Maybe<nsSize>& aSVGViewportSize, const bool aHasIntrinsicRatio) {
+  if (!IsReady()) {
+    MOZ_ASSERT_UNREACHABLE(
+        "Ensure PrepareImage() has returned true before "
+        "calling me");
+    return ImgDrawResult::BAD_ARGS;
+  }
+
+  if (aFill.IsEmpty() || aSrc.IsEmpty()) {
+    return ImgDrawResult::SUCCESS;
+  }
+
+  const bool isRequestBacked = mType == StyleImage::Tag::Url;
+  MOZ_ASSERT(isRequestBacked == mImage->IsImageRequestType());
+
+  if (isRequestBacked || mType == StyleImage::Tag::Element) {
+    nsCOMPtr<imgIContainer> subImage;
+
+    // To draw one portion of an image into a border component, we stretch that
+    // portion to match the size of that border component and then draw onto.
+    // However, preserveAspectRatio attribute of a SVG image may break this
+    // rule. To get correct rendering result, we add
+    // FLAG_FORCE_PRESERVEASPECTRATIO_NONE flag here, to tell mImage to ignore
+    // preserveAspectRatio attribute, and always do non-uniform stretch.
+    uint32_t drawFlags = ConvertImageRendererToDrawFlags(mFlags) |
+                         imgIContainer::FLAG_FORCE_PRESERVEASPECTRATIO_NONE;
+    // For those SVG image sources which don't have fixed aspect ratio (i.e.
+    // without viewport size and viewBox), we should scale the source uniformly
+    // after the viewport size is decided by "Default Sizing Algorithm".
+    if (!aHasIntrinsicRatio) {
+      drawFlags = drawFlags | imgIContainer::FLAG_FORCE_UNIFORM_SCALING;
+    }
+    // Retrieve or create the subimage we'll draw.
+    nsIntRect srcRect(aSrc.x, aSrc.y, aSrc.width, aSrc.height);
+    if (isRequestBacked) {
+      subImage = ImageOps::Clip(mImageContainer, srcRect, aSVGViewportSize);
+    } else {
+      // This path, for eStyleImageType_Element, is currently slower than it
+      // needs to be because we don't cache anything. (In particular, if we have
+      // to draw to a temporary surface inside ClippedImage, we don't cache that
+      // temporary surface since we immediately throw the ClippedImage we create
+      // here away.) However, if we did cache, we'd need to know when to
+      // invalidate that cache, and it's not clear that it's worth the trouble
+      // since using border-image with -moz-element is rare.
+
+      RefPtr<gfxDrawable> drawable =
+          DrawableForElement(nsRect(nsPoint(), mSize), aRenderingContext);
+      if (!drawable) {
+        NS_WARNING("Could not create drawable for element");
+        return ImgDrawResult::TEMPORARY_ERROR;
+      }
+
+      nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
+      subImage = ImageOps::Clip(image, srcRect, aSVGViewportSize);
+    }
+
+    MOZ_ASSERT(!aSVGViewportSize ||
+               subImage->GetType() == imgIContainer::TYPE_VECTOR);
+
+    SamplingFilter samplingFilter =
+        nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
+
+    if (!RequiresScaling(aFill, aHFill, aVFill, aUnitSize)) {
+      ImgDrawResult result = nsLayoutUtils::DrawSingleImage(
+          aRenderingContext, aPresContext, subImage, samplingFilter, aFill,
+          aDirtyRect, SVGImageContext(), drawFlags);
+
+      if (!mImage->IsComplete()) {
+        result &= ImgDrawResult::SUCCESS_NOT_COMPLETE;
+      }
+
+      return result;
+    }
+
+    nsSize repeatSize;
+    nsRect fillRect(aFill);
+    nsRect tile = ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize);
+
+    ImgDrawResult result = nsLayoutUtils::DrawBackgroundImage(
+        aRenderingContext, mForFrame, aPresContext, subImage, samplingFilter,
+        tile, fillRect, repeatSize, tile.TopLeft(), aDirtyRect, drawFlags,
+        ExtendMode::CLAMP, 1.0);
+
+    if (!mImage->IsComplete()) {
+      result &= ImgDrawResult::SUCCESS_NOT_COMPLETE;
+    }
+
+    return result;
+  }
+
+  nsSize repeatSize(aFill.Size());
+  nsRect fillRect(aFill);
+  nsRect destTile =
+      RequiresScaling(fillRect, aHFill, aVFill, aUnitSize)
+          ? ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize)
+          : fillRect;
+
+  return Draw(aPresContext, aRenderingContext, aDirtyRect, destTile, fillRect,
+              destTile.TopLeft(), repeatSize, aSrc);
+}
+
+ImgDrawResult nsImageRenderer::DrawShapeImage(nsPresContext* aPresContext,
+                                              gfxContext& aRenderingContext) {
+  if (!IsReady()) {
+    MOZ_ASSERT_UNREACHABLE(
+        "Ensure PrepareImage() has returned true before "
+        "calling me");
+    return ImgDrawResult::NOT_READY;
+  }
+
+  if (mSize.width <= 0 || mSize.height <= 0) {
+    return ImgDrawResult::SUCCESS;
+  }
+
+  if (mImage->IsImageRequestType()) {
+    uint32_t drawFlags =
+        ConvertImageRendererToDrawFlags(mFlags) | imgIContainer::FRAME_FIRST;
+    nsRect dest(nsPoint(0, 0), mSize);
+    // We have a tricky situation in our choice of SamplingFilter. Shape
+    // images define a float area based on the alpha values in the rendered
+    // pixels. When multiple device pixels are used for one css pixel, the
+    // sampling can change crisp edges into aliased edges. For visual pixels,
+    // that's usually the right choice. For defining a float area, it can
+    // cause problems. If a style is using a shape-image-threshold value that
+    // is less than the alpha of the edge pixels, any filtering may smear the
+    // alpha into adjacent pixels and expand the float area in a confusing
+    // way. Since the alpha threshold can be set precisely in CSS, and since a
+    // web author may be counting on that threshold to define a precise float
+    // area from an image, it is least confusing to have the rendered pixels
+    // have unfiltered alpha. We use SamplingFilter::POINT to ensure that each
+    // rendered pixel has an alpha that precisely matches the alpha of the
+    // closest pixel in the image.
+    return nsLayoutUtils::DrawSingleImage(
+        aRenderingContext, aPresContext, mImageContainer, SamplingFilter::POINT,
+        dest, dest, SVGImageContext(), drawFlags);
+  }
+
+  if (mImage->IsGradient()) {
+    nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
+        aPresContext, mForFrame->Style(), *mGradientData, mSize);
+    nsRect dest(nsPoint(0, 0), mSize);
+    renderer.Paint(aRenderingContext, dest, dest, mSize,
+                   CSSIntRect::FromAppUnitsRounded(dest), dest, 1.0);
+    return ImgDrawResult::SUCCESS;
+  }
+
+  // Unsupported image type.
+  return ImgDrawResult::BAD_IMAGE;
+}
+
+bool nsImageRenderer::IsRasterImage() {
+  return mImageContainer &&
+         mImageContainer->GetType() == imgIContainer::TYPE_RASTER;
+}
+
+already_AddRefed<imgIContainer> nsImageRenderer::GetImage() {
+  return do_AddRef(mImageContainer);
+}
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