cc: Use SkCreateColorSpaceXformCanvas for color transforms

cc/playback/raster_source.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/playback/raster_source.h"
 
 #include <stddef.h>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/base/region.h"
 #include "cc/debug/debug_colors.h"
 #include "cc/debug/traced_value.h"
 #include "cc/playback/display_item_list.h"
 #include "cc/playback/image_hijack_canvas.h"
 #include "cc/playback/skip_image_canvas.h"
 #include "skia/ext/analysis_canvas.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColorSpaceXformCanvas.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 
 namespace cc {
 
 scoped_refptr<RasterSource> RasterSource::CreateFromRecordingSource(
     const RecordingSource* other,
     bool can_use_lcd_text) {
   return make_scoped_refptr(new RasterSource(other, can_use_lcd_text));
 }
@@ skipping 25 matching lines @@
       size_(other->size_),
       clear_canvas_with_debug_color_(other->clear_canvas_with_debug_color_),
       slow_down_raster_scale_factor_for_debug_(
           other->slow_down_raster_scale_factor_for_debug_),
       image_decode_cache_(other->image_decode_cache_) {}
 
 RasterSource::~RasterSource() {
 }
 
 void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
+                                    const gfx::ColorSpace& canvas_color_space,
                                     const gfx::Rect& canvas_bitmap_rect,
                                     const gfx::Rect& canvas_playback_rect,
                                     float raster_scale,
                                     const PlaybackSettings& settings) const {
   SkIRect raster_bounds = gfx::RectToSkIRect(canvas_bitmap_rect);
   if (!canvas_playback_rect.IsEmpty() &&
       !raster_bounds.intersect(gfx::RectToSkIRect(canvas_playback_rect)))
     return;
   // Treat all subnormal values as zero for performance.
   ScopedSubnormalFloatDisabler disabler;
 
   raster_canvas->save();
   raster_canvas->translate(-canvas_bitmap_rect.x(), -canvas_bitmap_rect.y());
   raster_canvas->clipRect(SkRect::MakeFromIRect(raster_bounds));
   raster_canvas->scale(raster_scale, raster_scale);
-  PlaybackToCanvas(raster_canvas, settings);
+  PlaybackToCanvas(raster_canvas, canvas_color_space, settings);
   raster_canvas->restore();
 }
 
 void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
+                                    const gfx::ColorSpace& canvas_color_space,
                                     const PlaybackSettings& settings) const {
   if (!settings.playback_to_shared_canvas)
     PrepareForPlaybackToCanvas(raster_canvas);
 
   if (settings.skip_images) {
     SkipImageCanvas canvas(raster_canvas);
-    RasterCommon(&canvas, nullptr);
+    RasterCommon(&canvas, canvas_color_space, nullptr);
   } else if (settings.use_image_hijack_canvas) {
     const SkImageInfo& info = raster_canvas->imageInfo();
     ImageHijackCanvas canvas(info.width(), info.height(), image_decode_cache_,
                              &settings.images_to_skip);
     // Before adding the canvas, make sure that the ImageHijackCanvas is aware
     // of the current transform and clip, which may affect the clip bounds.
     // Since we query the clip bounds of the current canvas to get the list of
     // draw commands to process, this is important to produce correct content.
     canvas.clipRect(
         SkRect::MakeFromIRect(raster_canvas->getDeviceClipBounds()));
     canvas.setMatrix(raster_canvas->getTotalMatrix());
     canvas.addCanvas(raster_canvas);
 
-    RasterCommon(&canvas, nullptr);
+    RasterCommon(&canvas, canvas_color_space, nullptr);
   } else {
-    RasterCommon(raster_canvas, nullptr);
+    RasterCommon(raster_canvas, canvas_color_space, nullptr);
   }
 }
 
 namespace {
 
 bool CanvasIsUnclipped(const SkCanvas* canvas) {
   if (!canvas->isClipRect())
     return false;
 
   SkIRect bounds;
@@ skipping 72 matching lines @@
   canvas->save();
   // Use clipRegion to bypass CTM because the rects are device rects.
   SkRegion interest_region;
   interest_region.setRect(interest_rect);
   interest_region.op(opaque_rect, SkRegion::kDifference_Op);
   canvas->clipRegion(interest_region);
   canvas->clear(background_color_);
   canvas->restore();
 }
 
-void RasterSource::RasterCommon(SkCanvas* canvas,
+void RasterSource::RasterCommon(SkCanvas* input_canvas,
+                                const gfx::ColorSpace& target_color_space,
                                 SkPicture::AbortCallback* callback) const {
+  SkCanvas* raster_canvas = input_canvas;
+  std::unique_ptr<SkCanvas> color_transform_canvas;
+  if (target_color_space.IsValid()) {
+    color_transform_canvas = SkCreateColorSpaceXformCanvas(
+        input_canvas, target_color_space.ToSkColorSpace());
+    raster_canvas = color_transform_canvas.get();
+  }
   DCHECK(display_list_.get());
   int repeat_count = std::max(1, slow_down_raster_scale_factor_for_debug_);
   for (int i = 0; i < repeat_count; ++i)
-    display_list_->Raster(canvas, callback);
+    display_list_->Raster(raster_canvas, callback);
 }
 
 sk_sp<SkPicture> RasterSource::GetFlattenedPicture() {
   TRACE_EVENT0("cc", "RasterSource::GetFlattenedPicture");
 
   SkPictureRecorder recorder;
   SkCanvas* canvas = recorder.beginRecording(size_.width(), size_.height());
   if (!size_.IsEmpty()) {
     PrepareForPlaybackToCanvas(canvas);
-    RasterCommon(canvas, nullptr);
+    // No target color space should be set for generating an SkPicture.
+    RasterCommon(canvas, gfx::ColorSpace(), nullptr);
   }
 
   return recorder.finishRecordingAsPicture();
 }
 
 size_t RasterSource::GetMemoryUsage() const {
   if (!display_list_)
     return 0;
   return display_list_->ApproximateMemoryUsage() +
          painter_reported_memory_usage_;
 }
 
 bool RasterSource::PerformSolidColorAnalysis(const gfx::Rect& content_rect,
                                              float contents_scale,
                                              SkColor* color) const {
   TRACE_EVENT0("cc", "RasterSource::PerformSolidColorAnalysis");
 
   gfx::Rect layer_rect =
       gfx::ScaleToEnclosingRect(content_rect, 1.f / contents_scale);
 
   layer_rect.Intersect(gfx::Rect(size_));
   skia::AnalysisCanvas canvas(layer_rect.width(), layer_rect.height());
   canvas.translate(-layer_rect.x(), -layer_rect.y());
-  RasterCommon(&canvas, &canvas);
+  // No target color space should be set for solid color analysis (the
+  // resulting solid color will be known to be sRGB).
+  RasterCommon(&canvas, gfx::ColorSpace(), &canvas);
   return canvas.GetColorIfSolid(color);
 }
 
 void RasterSource::GetDiscardableImagesInRect(
     const gfx::Rect& layer_rect,
     float contents_scale,
     std::vector<DrawImage>* images) const {
   DCHECK_EQ(0u, images->size());
   display_list_->GetDiscardableImagesInRect(layer_rect, contents_scale, images);
 }
@@ skipping 58 matching lines @@
       use_image_hijack_canvas(true) {}
 
 RasterSource::PlaybackSettings::PlaybackSettings(const PlaybackSettings&) =
     default;
 
 RasterSource::PlaybackSettings::PlaybackSettings(PlaybackSettings&&) = default;
 
 RasterSource::PlaybackSettings::~PlaybackSettings() = default;
 
 }  // namespace cc