WIP RasterCanvasLayerAllocator

src/core/SkBitmapDevice.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkConfig8888.h"
 #include "SkDraw.h"
 #include "SkMallocPixelRef.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkPath.h"
 #include "SkPixelRef.h"
 #include "SkPixmap.h"
+#include "SkRasterCanvasLayerAllocator.h"
 #include "SkShader.h"
 #include "SkSurface.h"
 #include "SkXfermode.h"
 
 class SkColorTable;
 
 static bool valid_for_bitmap_device(const SkImageInfo& info,
                                     SkAlphaType* newAlphaType) {
     if (info.width() < 0 || info.height() < 0) {
         return false;
@@ skipping 94 matching lines @@
     fBitmap.setInfo(fBitmap.info().makeWH(size.fWidth, size.fHeight));
 }
 
 void SkBitmapDevice::replaceBitmapBackendForRasterSurface(const SkBitmap& bm) {
     SkASSERT(bm.width() == fBitmap.width());
     SkASSERT(bm.height() == fBitmap.height());
     fBitmap = bm;   // intent is to use bm's pixelRef (and rowbytes/config)
     fBitmap.lockPixels();
 }
 
-SkBaseDevice* SkBitmapDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint*) {
+SkBaseDevice* SkBitmapDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint*,
+                                             SkRasterCanvasLayerAllocator* alloc) {
     const SkSurfaceProps surfaceProps(this->surfaceProps().flags(), cinfo.fPixelGeometry);
-    return SkBitmapDevice::Create(cinfo.fInfo, surfaceProps);
+    SkBitmapDevice* dev = nullptr;
+    if (alloc) {
+        SkBitmap bitmap;
+        size_t rowBytes;
+        void* layer = alloc->allocateLayer(cinfo.fInfo, &rowBytes);
+        if (layer &&
+            bitmap.installPixels(cinfo.fInfo, layer, rowBytes)) {
+            dev = new SkBitmapDevice(bitmap);
+        }
+    } else {
+        dev = SkBitmapDevice::Create(cinfo.fInfo, surfaceProps);
+    }
+    return dev;
 }
 
 const SkBitmap& SkBitmapDevice::onAccessBitmap() {
     return fBitmap;
 }
 
 bool SkBitmapDevice::onAccessPixels(SkPixmap* pmap) {
     if (fBitmap.lockPixelsAreWritable() && this->onPeekPixels(pmap)) {
         fBitmap.notifyPixelsChanged();
         return true;
@@ skipping 233 matching lines @@
         paint.getRasterizer() ||
         paint.getPathEffect() ||
         paint.isFakeBoldText() ||
         paint.getStyle() != SkPaint::kFill_Style ||
         !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode))
     {
         return true;
     }
     return false;
 }