Bug 1704792 - Part 3. Make display list items request blobs for SVG images. r=jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D111838

layout/generic/nsImageFrame.cpp

@@ -30,6 +30,7 @@
 #include "mozilla/MouseEvents.h"
 #include "mozilla/PresShell.h"
 #include "mozilla/PresShellInlines.h"
+#include "mozilla/StaticPrefs_image.h"
 #include "mozilla/StaticPrefs_layout.h"
 #include "mozilla/SVGImageContext.h"
 #include "mozilla/Unused.h"
@@ -1998,6 +1999,10 @@ bool nsDisplayImage::CreateWebRenderCommands(
   if (aDisplayListBuilder->UseHighQualityScaling()) {
     flags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
   }
+  if (StaticPrefs::image_svg_blob_image() &&
+      mImage->GetType() == imgIContainer::TYPE_VECTOR) {
+    flags |= imgIContainer::FLAG_RECORD_BLOB;
+  }
 
   const int32_t factor = mFrame->PresContext()->AppUnitsPerDevPixel();
   LayoutDeviceRect destRect(
@@ -2021,13 +2026,25 @@ bool nsDisplayImage::CreateWebRenderCommands(
     case ImgDrawResult::INCOMPLETE:
     case ImgDrawResult::TEMPORARY_ERROR:
       if (mPrevImage && mPrevImage != mImage) {
+        // The current image and the previous image might be switching between
+        // rasterized surfaces and blob recordings, so we need to update the
+        // flags appropriately.
+        uint32_t prevFlags = flags;
+        if (StaticPrefs::image_svg_blob_image() &&
+            mPrevImage->GetType() == imgIContainer::TYPE_VECTOR) {
+          prevFlags |= imgIContainer::FLAG_RECORD_BLOB;
+        } else {
+          prevFlags &= ~imgIContainer::FLAG_RECORD_BLOB;
+        }
+
         RefPtr<ImageContainer> prevContainer;
         ImgDrawResult newDrawResult = mPrevImage->GetImageContainerAtSize(
-            aManager->LayerManager(), decodeSize, svgContext, flags,
+            aManager->LayerManager(), decodeSize, svgContext, prevFlags,
             getter_AddRefs(prevContainer));
         if (prevContainer && newDrawResult == ImgDrawResult::SUCCESS) {
           drawResult = newDrawResult;
           container = std::move(prevContainer);
+          flags = prevFlags;
           break;
         }
 
@@ -2054,8 +2071,13 @@ bool nsDisplayImage::CreateWebRenderCommands(
   // failure will be due to resource constraints and fallback is unlikely to
   // help us. Hence we can ignore the return value from PushImage.
   if (container) {
-    aManager->CommandBuilder().PushImage(this, container, aBuilder, aResources,
-                                         aSc, destRect, destRect);
+    if (flags & imgIContainer::FLAG_RECORD_BLOB) {
+      aManager->CommandBuilder().PushBlobImage(this, container, aBuilder,
+                                               aResources, destRect, destRect);
+    } else {
+      aManager->CommandBuilder().PushImage(this, container, aBuilder,
+                                           aResources, aSc, destRect, destRect);
+    }
   }
 
   nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, drawResult);

layout/painting/nsImageRenderer.cpp

@@ -24,6 +24,7 @@
 #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"
@@ -588,6 +589,11 @@ ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
       if (mFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
         containerFlags |= imgIContainer::FLAG_SYNC_DECODE;
       }
+      if (mExtendMode == ExtendMode::CLAMP &&
+          StaticPrefs::image_svg_blob_image() &&
+          mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
+        containerFlags |= imgIContainer::FLAG_RECORD_BLOB;
+      }
 
       CSSIntSize destCSSSize{
           nsPresContext::AppUnitsToIntCSSPixels(aDest.width),
@@ -616,6 +622,15 @@ ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
         break;
       }
 
+      if (containerFlags & imgIContainer::FLAG_RECORD_BLOB) {
+        MOZ_ASSERT(mExtendMode == ExtendMode::CLAMP);
+        LayoutDeviceRect clipRect =
+            LayoutDeviceRect::FromAppUnits(aFill, appUnitsPerDevPixel);
+        aManager->CommandBuilder().PushBlobImage(
+            aItem, container, aBuilder, aResources, destRect, clipRect);
+        break;
+      }
+
       mozilla::wr::ImageRendering rendering = wr::ToImageRendering(
           nsLayoutUtils::GetSamplingFilterForFrame(aItem->Frame()));
       gfx::IntSize size;

layout/svg/SVGImageFrame.cpp

@@ -20,6 +20,7 @@
 #include "SVGGeometryProperty.h"
 #include "SVGGeometryFrame.h"
 #include "mozilla/PresShell.h"
+#include "mozilla/StaticPrefs_image.h"
 #include "mozilla/SVGContentUtils.h"
 #include "mozilla/SVGImageContext.h"
 #include "mozilla/SVGObserverUtils.h"
@@ -602,6 +603,9 @@ bool SVGImageFrame::CreateWebRenderCommands(
 
   Maybe<SVGImageContext> svgContext;
   if (mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
+    if (StaticPrefs::image_svg_blob_image()) {
+      flags |= imgIContainer::FLAG_RECORD_BLOB;
+    }
     // Forward preserveAspectRatio to inner SVGs
     svgContext.emplace(Some(CSSIntSize::Truncate(width, height)),
                        Some(imgElem->mPreserveAspectRatio.GetAnimValue()));
@@ -639,8 +643,13 @@ bool SVGImageFrame::CreateWebRenderCommands(
     // failure will be due to resource constraints and fallback is unlikely to
     // help us. Hence we can ignore the return value from PushImage.
     if (container) {
-      aManager->CommandBuilder().PushImage(aItem, container, aBuilder,
-                                           aResources, aSc, destRect, clipRect);
+      if (flags & imgIContainer::FLAG_RECORD_BLOB) {
+        aManager->CommandBuilder().PushBlobImage(
+            aItem, container, aBuilder, aResources, destRect, clipRect);
+      } else {
+        aManager->CommandBuilder().PushImage(
+            aItem, container, aBuilder, aResources, aSc, destRect, clipRect);
+      }
     }
 
     nsDisplayItemGenericImageGeometry::UpdateDrawResult(aItem, drawResult);

layout/xul/nsImageBoxFrame.cpp

@@ -48,6 +48,7 @@
 #include "mozilla/EventDispatcher.h"
 #include "mozilla/Maybe.h"
 #include "mozilla/PresShell.h"
+#include "mozilla/StaticPrefs_image.h"
 #include "mozilla/SVGImageContext.h"
 #include "Units.h"
 #include "mozilla/layers/RenderRootStateManager.h"
@@ -419,6 +420,10 @@ ImgDrawResult nsImageBoxFrame::CreateWebRenderCommands(
   if (aFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
     containerFlags |= imgIContainer::FLAG_SYNC_DECODE;
   }
+  if (StaticPrefs::image_svg_blob_image() &&
+      imgCon->GetType() == imgIContainer::TYPE_VECTOR) {
+    containerFlags |= imgIContainer::FLAG_RECORD_BLOB;
+  }
 
   const int32_t appUnitsPerDevPixel = PresContext()->AppUnitsPerDevPixel();
   LayoutDeviceRect fillRect =
@@ -440,6 +445,20 @@ ImgDrawResult nsImageBoxFrame::CreateWebRenderCommands(
 
   mozilla::wr::ImageRendering rendering = wr::ToImageRendering(
       nsLayoutUtils::GetSamplingFilterForFrame(aItem->Frame()));
+  wr::LayoutRect fill = wr::ToLayoutRect(fillRect);
+
+  if (containerFlags & imgIContainer::FLAG_RECORD_BLOB) {
+    Maybe<wr::BlobImageKey> key = aManager->CommandBuilder().CreateBlobImageKey(
+        aItem, container, aResources);
+    if (key.isNothing()) {
+      return result;
+    }
+
+    aBuilder.PushImage(fill, fill, !BackfaceIsHidden(), rendering,
+                       wr::AsImageKey(key.value()));
+    return result;
+  }
+
   gfx::IntSize size;
   Maybe<wr::ImageKey> key = aManager->CommandBuilder().CreateImageKey(
       aItem, container, aBuilder, aResources, rendering, aSc, size, Nothing());
@@ -447,7 +466,6 @@ ImgDrawResult nsImageBoxFrame::CreateWebRenderCommands(
     return result;
   }
 
-  wr::LayoutRect fill = wr::ToLayoutRect(fillRect);
   aBuilder.PushImage(fill, fill, !BackfaceIsHidden(), rendering, key.value());
 
   return result;

modules/libpref/init/StaticPrefList.yaml

@@ -5469,6 +5469,12 @@
   value: -1
   mirror: once
 
+# Whether we record SVG images as blobs or not.
+- name: image.svg.blob-image
+  type: RelaxedAtomicBool
+  value: true
+  mirror: always
+
 # Whether we attempt to decode WebP images or not.
 - name: image.webp.enabled
   type: RelaxedAtomicBool