Add raster side dark mode switch and initial functionality.

This patch adds enable-raster-side-dark-mode-for-images switch to
enable raster side dark mode for images and initial functionality
to enable RSDM for bitmap images. PaintFlags will carry the
|use_dark_mode_for_image_| bit for specifying whether the
compositor should use a dark mode filter when rasterizing images.

Bug: 1094005
Change-Id: I424c9397235733fb07df4f1cad7bb758399fded9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445890
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#814106}

cc/paint/paint_flags.h

@@ -62,6 +62,12 @@ class CC_PAINT_EXPORT PaintFlags {
   ALWAYS_INLINE SkFilterQuality getFilterQuality() const {
     return static_cast<SkFilterQuality>(bitfields_.filter_quality_);
   }
+  ALWAYS_INLINE bool useDarkModeForImage() const {
+    return bitfields_.use_dark_mode_for_image_;
+  }
+  ALWAYS_INLINE void setUseDarkModeForImage(bool use_dark_mode_for_image) {
+    bitfields_.use_dark_mode_for_image_ = use_dark_mode_for_image;
+  }
   ALWAYS_INLINE SkScalar getStrokeWidth() const { return width_; }
   ALWAYS_INLINE void setStrokeWidth(SkScalar width) { width_ = width; }
   ALWAYS_INLINE SkScalar getStrokeMiter() const { return miter_limit_; }
@@ -195,6 +201,9 @@ class CC_PAINT_EXPORT PaintFlags {
     uint32_t join_type_ : 2;
     uint32_t style_ : 2;
     uint32_t filter_quality_ : 2;
+    // Specifies whether the compositor should use a dark mode filter when
+    // rasterizing image on the draw op with this PaintFlags.
+    uint32_t use_dark_mode_for_image_ : 1;
   };
 
   union {

chrome/browser/chromeos/login/chrome_restart_request.cc

@@ -172,6 +172,7 @@ void DeriveCommandLine(const GURL& start_url,
     blink::switches::kEnableLowResTiling,
     blink::switches::kEnablePreferCompositingToLCDText,
     blink::switches::kEnableRGBA4444Textures,
+    blink::switches::kEnableRasterSideDarkModeForImages,
     blink::switches::kEnableZeroCopy,
     blink::switches::kGpuRasterizationMSAASampleCount,
     chromeos::switches::kDefaultWallpaperLarge,

content/browser/renderer_host/render_process_host_impl.cc

@@ -3423,6 +3423,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     blink::switches::kEnableLowResTiling,
     blink::switches::kEnablePreferCompositingToLCDText,
     blink::switches::kEnableRGBA4444Textures,
+    blink::switches::kEnableRasterSideDarkModeForImages,
     blink::switches::kMinHeightForGpuRasterTile,
     blink::switches::kMaxUntiledLayerWidth,
     blink::switches::kMaxUntiledLayerHeight,

third_party/blink/common/switches.cc

@@ -77,6 +77,10 @@ const char kEnablePreferCompositingToLCDText[] =
 // Enables RGBA_4444 textures.
 const char kEnableRGBA4444Textures[] = "enable-rgba-4444-textures";
 
+// Enables raster side dark mode for images.
+const char kEnableRasterSideDarkModeForImages[] =
+    "enable-raster-side-dark-mode-for-images";
+
 // Enable rasterizer that writes directly to GPU memory associated with tiles.
 const char kEnableZeroCopy[] = "enable-zero-copy";
 

third_party/blink/public/common/switches.h

@@ -31,6 +31,7 @@ BLINK_COMMON_EXPORT extern const char
 BLINK_COMMON_EXPORT extern const char kEnableLowResTiling[];
 BLINK_COMMON_EXPORT extern const char kEnablePreferCompositingToLCDText[];
 BLINK_COMMON_EXPORT extern const char kEnableRGBA4444Textures[];
+BLINK_COMMON_EXPORT extern const char kEnableRasterSideDarkModeForImages[];
 BLINK_COMMON_EXPORT extern const char kEnableZeroCopy[];
 BLINK_COMMON_EXPORT extern const char kForceLegacyDefaultReferrerPolicy[];
 BLINK_COMMON_EXPORT extern const char kGpuRasterizationMSAASampleCount[];

third_party/blink/renderer/platform/graphics/dark_mode_filter_helper.cc

@@ -4,13 +4,23 @@
 
 #include "third_party/blink/renderer/platform/graphics/dark_mode_filter_helper.h"
 
+#include "base/command_line.h"
 #include "base/hash/hash.h"
+#include "third_party/blink/public/common/switches.h"
 #include "third_party/blink/renderer/platform/graphics/dark_mode_image_cache.h"
 #include "third_party/blink/renderer/platform/graphics/graphics_context.h"
 #include "third_party/blink/renderer/platform/graphics/image.h"
 
 namespace blink {
 
+namespace {
+bool IsRasterSideDarkModeForImagesEnabled() {
+  static bool enabled = base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableRasterSideDarkModeForImages);
+  return enabled;
+}
+}  // namespace
+
 // static
 SkColor DarkModeFilterHelper::ApplyToColorIfNeeded(
     GraphicsContext* context,
@@ -38,6 +48,13 @@ void DarkModeFilterHelper::ApplyToImageIfNeeded(GraphicsContext* context,
   if (!context->IsDarkModeEnabled())
     return;
 
+  // For RSDM, just set the dark mode on flags and rest will be taken care at
+  // compositor side.
+  if (image->IsBitmapImage() && IsRasterSideDarkModeForImagesEnabled()) {
+    flags->setUseDarkModeForImage(true);
+    return;
+  }
+
   SkIRect rounded_src = src.roundOut();
   SkIRect rounded_dst = dst.roundOut();