add peekPixels to SkCanvas and SkSurface

gm/gammatext.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkPath.h"
@@ skipping 20 matching lines @@
         paint->setTypeface(tf)->unref();
         return true;
     }
     return false;
 }
 
 #ifdef SK_BUILD_FOR_MAC
 #import <ApplicationServices/ApplicationServices.h>
 #define BITMAP_INFO_RGB     (kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host)
 
-static CGContextRef makeCG(const SkBitmap& bm) {
-    if (SkBitmap::kARGB_8888_Config != bm.config() ||
-        NULL == bm.getPixels()) {
+static CGContextRef makeCG(const SkImageInfo& info, const void* addr,
+                           size_t rowBytes) {
+    if (kPMColor_SkColorType != info.colorType() || NULL == addr) {
         return NULL;
     }
     CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
-    CGContextRef cg = CGBitmapContextCreate(bm.getPixels(), bm.width(), bm.height(),
-                                            8, bm.rowBytes(), space, BITMAP_INFO_RGB);
+    CGContextRef cg = CGBitmapContextCreate((void*)addr, info.width(), info.height(),
+                                            8, rowBytes, space, BITMAP_INFO_RGB);
     CFRelease(space);
 
     CGContextSetAllowsFontSubpixelQuantization(cg, false);
     CGContextSetShouldSubpixelQuantizeFonts(cg, false);
 
     return cg;
 }
 
 extern CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face);
 
@@ skipping 77 matching lines @@
 
         canvas->clear(SK_ColorRED);
         SkPaint paint;
         paint.setShader(s)->unref();
         SkRect r = { 0, 0, SkIntToScalar(1024), SkIntToScalar(HEIGHT) };
         canvas->drawRect(r, paint);
     }
 
     virtual void onDraw(SkCanvas* canvas) {
 #ifdef SK_BUILD_FOR_MAC
-        CGContextRef cg = makeCG(canvas->getDevice()->accessBitmap(false));
+        CGContextRef cg = 0;
+        {
+            SkImageInfo info;
+            size_t rowBytes;
+            const void* addr = canvas->peekPixels(&info, &rowBytes);
+            if (addr) {
+                cg = makeCG(info, addr, rowBytes);
+            }
+        }
 #endif
 
         drawGrad(canvas);
 
         const SkColor fg[] = {
             0xFFFFFFFF,
             0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF,
             0xFFFF0000, 0xFF00FF00, 0xFF0000FF,
             0xFF000000,
         };
@@ skipping 36 matching lines @@
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new GammaTextGM; }
 static GMRegistry reg(MyFactory);
 
 }