Implements core logic for Pixel Canvas

ui/compositor/paint_recorder.cc

Index: ui/compositor/paint_recorder.cc
diff --git a/ui/compositor/paint_recorder.cc b/ui/compositor/paint_recorder.cc
index 8a8c4c28caf55c97e0c6cc0c0bc55e86f98430cc..c3c99d12e6812368504d0ee7e80975f8cb643072 100644
--- a/ui/compositor/paint_recorder.cc
+++ b/ui/compositor/paint_recorder.cc
@@ -9,6 +9,7 @@
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/compositor/paint_cache.h"
 #include "ui/compositor/paint_context.h"
+#include "ui/compositor/paint_info.h"
 #include "ui/gfx/skia_util.h"
 
 namespace ui {
@@ -19,29 +20,35 @@ namespace ui {
 // If a |cache| is provided, this records into the |cache|'s PaintOpBuffer
 // directly, then appends that to the |context|. If not, then this records
 // to the |context|'s PaintOpBuffer.
-PaintRecorder::PaintRecorder(const PaintContext& context,
-                             const gfx::Size& recording_size,
-                             PaintCache* cache)
-    : context_(context),
+PaintRecorder::PaintRecorder(const PaintInfo& info, PaintCache* cache)
+    : context_(info.context()),
       record_canvas_(cache ? cache->ResetCache() : context_.list_->StartPaint(),
-                     gfx::RectToSkRect(gfx::Rect(recording_size))),
-      canvas_(&record_canvas_, context.device_scale_factor_),
+                     gfx::RectToSkRect(gfx::Rect(info.paint_recording_size()))),
+      canvas_(&record_canvas_, context_.device_scale_factor_),
       cache_(cache),
-      recording_size_(recording_size) {
+      recording_size_(info.paint_recording_size()),
+      is_pixel_canvas_(info.IsPixelCanvas()) {
 #if DCHECK_IS_ON()
-  DCHECK(!context.inside_paint_recorder_);
-  context.inside_paint_recorder_ = true;
+  DCHECK(!context_.inside_paint_recorder_);
+  context_.inside_paint_recorder_ = true;
 #endif
+  if (is_pixel_canvas_) {
+    canvas()->Save();
+    canvas()->Scale(info.paint_recording_scale().x(),
+                    info.paint_recording_scale().y());
+  }
 }
 
 PaintRecorder::PaintRecorder(const PaintContext& context,
                              const gfx::Size& recording_size)
-    : PaintRecorder(context, recording_size, nullptr) {}
+    : PaintRecorder(PaintInfo(context, recording_size), nullptr) {}
 
 PaintRecorder::~PaintRecorder() {
 #if DCHECK_IS_ON()
   context_.inside_paint_recorder_ = false;
 #endif
+  if (is_pixel_canvas_)
+    canvas()->Restore();
   // If using cache, append what we've saved there to the PaintContext.
   // Otherwise, the content is already stored in the PaintContext, and we can
   // just close it.