add peekPixels to SkCanvas and SkSurface

fix reference to SkBaseDevice, which was only a problem in no-gpu build

This reverts commit 4fa44a6bf73891b21917fb90d02beef9143bffa3.

R=reed@google.com

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/163603003

git-svn-id: http://skia.googlecode.com/svn/trunk@13432 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/aaclip.cpp b/gm/aaclip.cpp
index ec29a4f..5742902 100644
--- a/gm/aaclip.cpp
+++ b/gm/aaclip.cpp
@@ -9,203 +9,11 @@
 #include "SkCanvas.h"
 #include "SkPath.h"
 
-static void test_quadstroke(SkCanvas* canvas) {
-    SkPath path;
-    path.moveTo(6, 0);
-    path.quadTo(150, 150, 0, 6);
-
-    SkPaint paint;
-
-    paint.setAntiAlias(true);
-    paint.setStyle(SkPaint::kStroke_Style);
-    canvas->translate(20, 20);
-
-#if 1
-    canvas->drawPath(path, paint);
-    canvas->translate(100, 0);
-#endif
-
-    paint.setStrokeWidth(1.01f);
-    canvas->drawPath(path, paint);
-}
-
-static void draw_conic(SkCanvas* canvas, SkScalar weight, const SkPaint& paint) {
-    SkPath path;
-    path.moveTo(100, 100);
-    path.conicTo(300, 100, 300, 300, weight);
-    canvas->drawPath(path, paint);
-}
-
-static void test_conic(SkCanvas* canvas) {
-    SkPaint paint;
-    paint.setAntiAlias(true);
-    paint.setStyle(SkPaint::kStroke_Style);
-
-    static const struct {
-        SkScalar fWeight;
-        SkColor  fColor;
-    } gRec[] = {
-        { 2   , SK_ColorRED },
-        { 1   , SK_ColorGREEN },
-        { 0.5f, SK_ColorBLUE },
-    };
-
-    for (SkScalar width = 0; width <= 20; width += 20) {
-        canvas->save();
-        paint.setStrokeWidth(width);
-        for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
-            paint.setColor(gRec[i].fColor);
-            draw_conic(canvas, gRec[i].fWeight, paint);
-            canvas->translate(-30, 30);
-        }
-        canvas->restore();
-        canvas->translate(300, 0);
-    }
-}
-
-#include "SkGradientShader.h"
-static void test_shallow_gradient(SkCanvas* canvas, SkScalar width, SkScalar height) {
-    SkColor colors[] = { 0xFF7F7F7F, 0xFF7F7F7F, 0xFF000000 };
-    SkScalar pos[] = { 0, 0.35f, SK_Scalar1 };
-    SkPoint pts[] = { { 0, 0 }, { width, height } };
-    SkShader* s = SkGradientShader::CreateLinear(pts, colors, pos,
-                                                 SK_ARRAY_COUNT(colors),
-                                                 SkShader::kClamp_TileMode);
-    SkPaint paint;
-    paint.setShader(s)->unref();
-    canvas->drawPaint(paint);
-}
-
-#include "SkDashPathEffect.h"
-static void test_giant_dash(SkCanvas* canvas) {
-    SkPaint paint;
-    const SkScalar intervals[] = { SK_Scalar1, SK_Scalar1 };
-
-    paint.setStrokeWidth(2);
-    paint.setPathEffect(new SkDashPathEffect(intervals, 2, 0))->unref();
-
-    SkScalar big = 500 * 1000;
-
-    canvas->drawLine(10, 10, big, 10, paint);
-    canvas->drawLine(-big, 20, 500, 20, paint);
-    canvas->drawLine(-big, 30, big, 30, paint);
-
-    const SkScalar intervals2[] = { 20, 5, 10, 5 };
-    paint.setPathEffect(new SkDashPathEffect(intervals2, 4, 17))->unref();
-
-    canvas->translate(0, 40);
-    SkScalar x = -500;
-    SkScalar width = 3173;
-    for (int i = 0; i < 40; ++i) {
-        if (i > 10)
-        canvas->drawLine(x, 0, x + width, 0, paint);
-        x += 1;
-        canvas->translate(0, 4);
-    }
-}
-
-
-
-// Reproduces bug found here: http://jsfiddle.net/R8Cu5/1/
-//
-#include "SkGradientShader.h"
-static void test_grad(SkCanvas* canvas) {
-    SkPoint pts[] = {
-        { 478.544067f, -84.2041016f },
-        { 602.455933f, 625.204102f },
-    };
-    SkColor colors[] = { SK_ColorBLACK, SK_ColorBLACK, SK_ColorRED, SK_ColorRED };
-    SkScalar pos[] = { 0, 0.3f, 0.3f, 1.0f };
-    SkShader* s = SkGradientShader::CreateLinear(pts, colors, pos, 4, SkShader::kClamp_TileMode);
-    SkPaint p;
-    p.setShader(s)->unref();
-    canvas->drawPaint(p);
-}
-
-static SkCanvas* MakeCanvas(const SkIRect& bounds) {
-    SkBitmap bm;
-    bm.allocN32Pixels(bounds.width(), bounds.height());
-    bm.eraseColor(SK_ColorTRANSPARENT);
-
-    SkCanvas* canvas = new SkCanvas(bm);
-    canvas->translate(-SkIntToScalar(bounds.fLeft), -SkIntToScalar(bounds.fTop));
-    return canvas;
-}
-
-#ifdef SK_DEBUG
-static void GetBitmap(const SkCanvas* canvas, SkBitmap* bm) {
-    *bm = canvas->getDevice()->accessBitmap(false);
-}
-#endif
-
-static void compare_canvas(const SkCanvas* a, const SkCanvas* b) {
-#ifdef SK_DEBUG
-    SkBitmap bma, bmb;
-    GetBitmap(a, &bma);
-    GetBitmap(b, &bmb);
-
-    SkASSERT(bma.width() == bmb.width());
-    SkASSERT(bma.height() == bmb.height());
-
-    bma.lockPixels();
-    bmb.lockPixels();
-    for (int y = 0; y < bma.height(); ++y) {
-        const SkPMColor* rowa = bma.getAddr32(0, y);
-        const SkPMColor* rowb = bmb.getAddr32(0, y);
-        SkASSERT(!memcmp(rowa, rowb, bma.width() << 2));
-
-        for (int x = 1; x < bma.width() - 1; ++x) {
-            SkASSERT(0xFF000000 == rowa[x]);
-            SkASSERT(0xFF000000 == rowb[x]);
-        }
-    }
-#endif
-}
-
-static void drawRectAsPath(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
-    SkPath path;
-    path.addRect(r);
-    canvas->drawPath(path, p);
-}
-
-static void test_maskFromPath(const SkPath& path) {
-    SkIRect bounds;
-    path.getBounds().roundOut(&bounds);
-
-    SkPaint paint;
-    paint.setAntiAlias(true);
-
-    SkAutoTUnref<SkCanvas> path_canvas(MakeCanvas(bounds));
-    path_canvas->drawPath(path, paint);
-
-    SkAutoTUnref<SkCanvas> rect_canvas(MakeCanvas(bounds));
-    drawRectAsPath(rect_canvas, path.getBounds(), paint);
-
-    compare_canvas(path_canvas, rect_canvas);
-}
-
-static void test_mask() {
-    for (int i = 1; i <= 20; ++i) {
-        const SkScalar dx = SK_Scalar1 / i;
-        const SkRect constr = SkRect::MakeWH(dx, SkIntToScalar(2));
-        for (int n = 2; n < 20; ++n) {
-            SkPath path;
-            path.setFillType(SkPath::kEvenOdd_FillType);
-            SkRect r = constr;
-            while (r.fRight < SkIntToScalar(4)) {
-                path.addRect(r);
-                r.offset(dx, 0);
-            }
-            test_maskFromPath(path);
-        }
-    }
-}
-
 /** Draw a 2px border around the target, then red behind the target;
     set the clip to match the target, then draw >> the target in blue.
 */
 
-static void draw (SkCanvas* canvas, SkRect& target, int x, int y) {
+static void draw(SkCanvas* canvas, SkRect& target, int x, int y) {
     SkPaint borderPaint;
     borderPaint.setColor(SkColorSetRGB(0x0, 0xDD, 0x0));
     borderPaint.setAntiAlias(true);
@@ -228,22 +36,22 @@
     canvas->restore();
 }
 
-static void draw_square (SkCanvas* canvas, int x, int y) {
+static void draw_square(SkCanvas* canvas, int x, int y) {
     SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 10 * SK_Scalar1));
     draw(canvas, target, x, y);
 }
 
-static void draw_column (SkCanvas* canvas, int x, int y) {
+static void draw_column(SkCanvas* canvas, int x, int y) {
     SkRect target (SkRect::MakeWH(1 * SK_Scalar1, 10 * SK_Scalar1));
     draw(canvas, target, x, y);
 }
 
-static void draw_bar (SkCanvas* canvas, int x, int y) {
+static void draw_bar(SkCanvas* canvas, int x, int y) {
     SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 1 * SK_Scalar1));
     draw(canvas, target, x, y);
 }
 
-static void draw_rect_tests (SkCanvas* canvas) {
+static void draw_rect_tests(SkCanvas* canvas) {
     draw_square(canvas, 10, 10);
     draw_column(canvas, 30, 10);
     draw_bar(canvas, 10, 30);
@@ -272,23 +80,6 @@
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
-        if (false) { test_quadstroke(canvas); return; }
-        if (false) { test_conic(canvas); return; }
-        if (false) {
-            SkRect bounds;
-            canvas->getClipBounds(&bounds);
-            test_shallow_gradient(canvas, bounds.width(), bounds.height()); return;
-        }
-        if (false) {
-            test_giant_dash(canvas); return;
-        }
-        if (false) {
-            test_grad(canvas); return;
-        }
-        if (false) { // avoid bit rot, suppress warning
-            test_mask();
-        }
-
         // Initial pixel-boundary-aligned draw
         draw_rect_tests(canvas);
 
diff --git a/gm/bitmapcopy.cpp b/gm/bitmapcopy.cpp
index 928b403..f210b4a 100644
--- a/gm/bitmapcopy.cpp
+++ b/gm/bitmapcopy.cpp
@@ -62,14 +62,14 @@
 
     virtual void onDraw(SkCanvas* canvas) {
         SkPaint paint;
-        SkScalar horizMargin(SkIntToScalar(10));
-        SkScalar vertMargin(SkIntToScalar(10));
+        SkScalar horizMargin = 10;
+        SkScalar vertMargin = 10;
 
-        SkBitmapDevice devTmp(SkBitmap::kARGB_8888_Config, 40, 40, false);
-        SkCanvas canvasTmp(&devTmp);
+        SkBitmap src;
+        src.allocN32Pixels(40, 40);
+        SkCanvas canvasTmp(src);
 
         draw_checks(&canvasTmp, 40, 40);
-        SkBitmap src = canvasTmp.getTopDevice()->accessBitmap(false);
 
         for (unsigned i = 0; i < NUM_CONFIGS; ++i) {
             if (!src.deepCopyTo(&fDst[i], gConfigs[i])) {
diff --git a/gm/bitmapsource.cpp b/gm/bitmapsource.cpp
index 6d575eb..f40cc15 100644
--- a/gm/bitmapsource.cpp
+++ b/gm/bitmapsource.cpp
@@ -23,8 +23,7 @@
 
     void makeBitmap() {
         fBitmap.allocN32Pixels(100, 100);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
diff --git a/gm/deviceproperties.cpp b/gm/deviceproperties.cpp
index 8c4649c..2083946 100644
--- a/gm/deviceproperties.cpp
+++ b/gm/deviceproperties.cpp
@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 #include "gm.h"
+#include "SkBitmapDevice.h"
 #include "SkTypeface.h"
 
 namespace skiagm {
diff --git a/gm/displacement.cpp b/gm/displacement.cpp
index ef6207a..b1f097b 100644
--- a/gm/displacement.cpp
+++ b/gm/displacement.cpp
@@ -33,8 +33,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(80, 80);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
@@ -46,8 +45,7 @@
 
     void make_checkerboard(SkBitmap* bitmap, int w, int h) {
         bitmap->allocN32Pixels(w, h);
-        SkBitmapDevice device(*bitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(*bitmap);
         canvas.clear(0x00000000);
         SkPaint darkPaint;
         darkPaint.setColor(0xFF804020);
diff --git a/gm/gammatext.cpp b/gm/gammatext.cpp
index 99642f6..7ee55db 100644
--- a/gm/gammatext.cpp
+++ b/gm/gammatext.cpp
@@ -38,14 +38,14 @@
 #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);
@@ -143,7 +143,15 @@
 
     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);
diff --git a/gm/gm.h b/gm/gm.h
index 4da688c..372b781 100644
--- a/gm/gm.h
+++ b/gm/gm.h
@@ -1,15 +1,14 @@
-
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #ifndef skiagm_DEFINED
 #define skiagm_DEFINED
 
 #include "SkBitmap.h"
-#include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkPaint.h"
 #include "SkSize.h"
diff --git a/gm/imagefiltersclipped.cpp b/gm/imagefiltersclipped.cpp
index 82873ab..331ea49 100644
--- a/gm/imagefiltersclipped.cpp
+++ b/gm/imagefiltersclipped.cpp
@@ -35,8 +35,7 @@
 
     void make_checkerboard() {
         fCheckerboard.allocN32Pixels(64, 64);
-        SkBitmapDevice device(fCheckerboard);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fCheckerboard);
         canvas.clear(0x00000000);
         SkPaint darkPaint;
         darkPaint.setColor(0xFF404040);
@@ -58,10 +57,9 @@
     void make_gradient_circle(int width, int height) {
         SkScalar x = SkIntToScalar(width / 2);
         SkScalar y = SkIntToScalar(height / 2);
-        SkScalar radius = SkScalarMul(SkMinScalar(x, y), SkIntToScalar(4) / SkIntToScalar(5));
+        SkScalar radius = SkMinScalar(x, y) * 0.8f;
         fGradientCircle.allocN32Pixels(width, height);
-        SkBitmapDevice device(fGradientCircle);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fGradientCircle);
         canvas.clear(0x00000000);
         SkColor colors[2];
         colors[0] = SK_ColorWHITE;
diff --git a/gm/imagefiltersgraph.cpp b/gm/imagefiltersgraph.cpp
index 6d5105e..882918c 100644
--- a/gm/imagefiltersgraph.cpp
+++ b/gm/imagefiltersgraph.cpp
@@ -8,6 +8,7 @@
 #include "gm.h"
 
 #include "SkArithmeticMode.h"
+#include "SkDevice.h"
 #include "SkBitmapSource.h"
 #include "SkBlurImageFilter.h"
 #include "SkColorFilter.h"
@@ -93,8 +94,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(100, 100);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
diff --git a/gm/imagefiltersscaled.cpp b/gm/imagefiltersscaled.cpp
index a9c4a10..28b3c9f 100644
--- a/gm/imagefiltersscaled.cpp
+++ b/gm/imagefiltersscaled.cpp
@@ -35,8 +35,7 @@
 
     void make_checkerboard() {
         fCheckerboard.allocN32Pixels(64, 64);
-        SkBitmapDevice device(fCheckerboard);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fCheckerboard);
         canvas.clear(0x00000000);
         SkPaint darkPaint;
         darkPaint.setColor(0xFF404040);
@@ -60,8 +59,7 @@
         SkScalar y = SkIntToScalar(height / 2);
         SkScalar radius = SkScalarMul(SkMinScalar(x, y), SkIntToScalar(4) / SkIntToScalar(5));
         fGradientCircle.allocN32Pixels(width, height);
-        SkBitmapDevice device(fGradientCircle);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fGradientCircle);
         canvas.clear(0x00000000);
         SkColor colors[2];
         colors[0] = SK_ColorWHITE;
diff --git a/gm/lighting.cpp b/gm/lighting.cpp
index 1cab553..858976b 100644
--- a/gm/lighting.cpp
+++ b/gm/lighting.cpp
@@ -26,8 +26,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(100, 100);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
@@ -38,7 +37,7 @@
     }
 
     virtual SkISize onISize() {
-        return make_isize(WIDTH, HEIGHT);
+        return SkISize::Make(WIDTH, HEIGHT);
     }
 
     void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x, int y) {
diff --git a/gm/matrixconvolution.cpp b/gm/matrixconvolution.cpp
index 47a3581..b986cc1 100644
--- a/gm/matrixconvolution.cpp
+++ b/gm/matrixconvolution.cpp
@@ -25,8 +25,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(80, 80);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
diff --git a/gm/morphology.cpp b/gm/morphology.cpp
index 5cfb1c2..a2206b8 100644
--- a/gm/morphology.cpp
+++ b/gm/morphology.cpp
@@ -27,8 +27,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(135, 135);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x0);
         SkPaint paint;
         paint.setAntiAlias(true);
diff --git a/gm/ninepatchstretch.cpp b/gm/ninepatchstretch.cpp
index a14af00..74cc87f 100644
--- a/gm/ninepatchstretch.cpp
+++ b/gm/ninepatchstretch.cpp
@@ -13,10 +13,7 @@
     const int kSize = 2*kFixed + kStretchy;
 
     bitmap->allocN32Pixels(kSize, kSize);
-    SkBaseDevice* dev = new SkBitmapDevice(*bitmap);
-
-    SkCanvas canvas(dev);
-    dev->unref();
+    SkCanvas canvas(*bitmap);
     canvas.clear(SK_ColorTRANSPARENT);
 
     SkRect r = SkRect::MakeWH(SkIntToScalar(kSize), SkIntToScalar(kSize));
diff --git a/gm/offsetimagefilter.cpp b/gm/offsetimagefilter.cpp
index 1b76ba2..0425311 100644
--- a/gm/offsetimagefilter.cpp
+++ b/gm/offsetimagefilter.cpp
@@ -28,8 +28,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(80, 80);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
@@ -40,10 +39,8 @@
     }
 
     void make_checkerboard() {
-        fCheckerboard.setConfig(SkBitmap::kARGB_8888_Config, 80, 80);
-        fCheckerboard.allocPixels();
-        SkBitmapDevice device(fCheckerboard);
-        SkCanvas canvas(&device);
+        fCheckerboard.allocN32Pixels(80, 80);
+        SkCanvas canvas(fCheckerboard);
         canvas.clear(0x00000000);
         SkPaint darkPaint;
         darkPaint.setColor(0xFF404040);
diff --git a/gm/peekpixels.cpp b/gm/peekpixels.cpp
new file mode 100644
index 0000000..c6744d3
--- /dev/null
+++ b/gm/peekpixels.cpp
@@ -0,0 +1,78 @@
+/*
+ * 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"
+#include "SkSurface.h"
+#include "SkPicture.h"
+
+static void draw_content(SkCanvas* canvas) {
+    SkImageInfo info = canvas->imageInfo();
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    canvas->drawCircle(SkScalarHalf(info.width()), SkScalarHalf(info.height()),
+                       SkScalarHalf(info.width()), paint);
+}
+
+class PeekPixelsGM : public skiagm::GM {
+public:
+    PeekPixelsGM() {}
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("peekpixels");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return SkISize::Make(640, 480);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
+        SkAutoTUnref<SkSurface> surface(canvas->newSurface(info));
+        if (surface.get()) {
+            SkCanvas* surfCanvas = surface->getCanvas();
+            
+            draw_content(surfCanvas);
+            SkBitmap bitmap;
+            
+            // test peekPixels
+            {
+                SkImageInfo info;
+                size_t rowBytes;
+                const void* addr = surfCanvas->peekPixels(&info, &rowBytes);
+                if (addr && bitmap.installPixels(info, const_cast<void*>(addr),
+                                                 rowBytes, NULL, NULL)) {
+                    canvas->drawBitmap(bitmap, 0, 0, NULL);
+                }
+            }
+            
+            // test ROCanvasPixels
+            canvas->translate(120, 0);
+            SkAutoROCanvasPixels ropixels(surfCanvas);
+            if (ropixels.asROBitmap(&bitmap)) {
+                canvas->drawBitmap(bitmap, 0, 0, NULL);
+            }
+            
+            // test Surface
+            canvas->translate(120, 0);
+            surface->draw(canvas, 0, 0, NULL);
+        }
+    }
+
+    virtual uint32_t onGetFlags() const {
+        // we explicitly test peekPixels and readPixels, neither of which
+        // return something for a picture-backed canvas, so we skip that test.
+        return kSkipPicture_Flag;
+    }
+
+private:
+    typedef skiagm::GM INHERITED;
+};
+
+DEF_GM( return SkNEW(PeekPixelsGM); )
diff --git a/gm/tileimagefilter.cpp b/gm/tileimagefilter.cpp
index d0acad7..319aa3c 100644
--- a/gm/tileimagefilter.cpp
+++ b/gm/tileimagefilter.cpp
@@ -28,8 +28,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(80, 80);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0xFF000000);
         SkPaint paint;
         paint.setAntiAlias(true);
@@ -41,8 +40,7 @@
 
     void make_checkerboard() {
         fCheckerboard.allocN32Pixels(80, 80);
-        SkBitmapDevice device(fCheckerboard);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fCheckerboard);
         canvas.clear(0x00000000);
         SkPaint darkPaint;
         darkPaint.setColor(0xFF404040);
diff --git a/gm/xfermodeimagefilter.cpp b/gm/xfermodeimagefilter.cpp
index f843d40..4469618 100644
--- a/gm/xfermodeimagefilter.cpp
+++ b/gm/xfermodeimagefilter.cpp
@@ -30,8 +30,7 @@
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(80, 80);
-        SkBitmapDevice device(fBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
@@ -43,8 +42,7 @@
 
     void make_checkerboard() {
         fCheckerboard.allocN32Pixels(80, 80);
-        SkBitmapDevice device(fCheckerboard);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(fCheckerboard);
         canvas.clear(0x00000000);
         SkPaint darkPaint;
         darkPaint.setColor(0xFF404040);
diff --git a/gm/xfermodes3.cpp b/gm/xfermodes3.cpp
index bb7d614..76c4b88 100644
--- a/gm/xfermodes3.cpp
+++ b/gm/xfermodes3.cpp
@@ -168,8 +168,11 @@
         if (NULL == layerCanvas) {
             canvas->restore();
         } else {
-            SkBitmap bitmap = layerCanvas->getDevice()->accessBitmap(false);
-            canvas->drawBitmap(bitmap, 0, 0);
+            SkAutoROCanvasPixels ropixels(layerCanvas);
+            SkBitmap bitmap;
+            if (ropixels.asROBitmap(&bitmap)) {
+                canvas->drawBitmap(bitmap, 0, 0);
+            }
         }
 
         r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
diff --git a/gyp/gmslides.gypi b/gyp/gmslides.gypi
index ca3a7f6..e95f59b 100644
--- a/gyp/gmslides.gypi
+++ b/gyp/gmslides.gypi
@@ -121,6 +121,7 @@
     '../gm/pathopsinverse.cpp',
     '../gm/pathopsskpclip.cpp',
     '../gm/pathreverse.cpp',
+    '../gm/peekpixels.cpp',
     '../gm/perlinnoise.cpp',
     '../gm/pictureimagefilter.cpp',
     '../gm/points.cpp',
diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h
index 42ef877..b6851de 100644
--- a/include/core/SkBitmap.h
+++ b/include/core/SkBitmap.h
@@ -897,4 +897,11 @@
     return (*fColorTable)[*((const uint8_t*)fPixels + y * fRowBytes + x)];
 }
 
+///////////////////////////////////////////////////////////////////////////////
+//
+// Helpers until we can fully deprecate SkBitmap::Config
+//
+extern SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType);
+extern SkColorType SkBitmapConfigToColorType(SkBitmap::Config);
+
 #endif
diff --git a/include/core/SkBitmapDevice.h b/include/core/SkBitmapDevice.h
index e4f9b88..be98c95 100644
--- a/include/core/SkBitmapDevice.h
+++ b/include/core/SkBitmapDevice.h
@@ -82,6 +82,8 @@
     */
     virtual SkBitmap::Config config() const SK_OVERRIDE { return fBitmap.config(); }
 
+    virtual SkImageInfo imageInfo() const SK_OVERRIDE;
+
     /**
      *  DEPRECATED: This will be made protected once WebKit stops using it.
      *              Instead use Canvas' writePixels method.
@@ -278,6 +280,7 @@
     virtual void flush() SK_OVERRIDE {}
 
     virtual SkSurface* newSurface(const SkImageInfo&) SK_OVERRIDE;
+    virtual const void* peekPixels(SkImageInfo*, size_t* rowBytes) SK_OVERRIDE;
 
     SkBitmap    fBitmap;
 
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index b1d415f..d2e3705 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -76,6 +76,12 @@
 
     SkMetaData& getMetaData();
 
+    /**
+     *  Return ImageInfo for this canvas. If the canvas is not backed by pixels
+     *  (cpu or gpu), then the info's ColorType will be kUnknown_SkColorType.
+     */
+    SkImageInfo imageInfo() const;
+
     ///////////////////////////////////////////////////////////////////////////
 
     /**
@@ -84,16 +90,19 @@
     void flush();
 
     /**
+     *  DEPRECATED: call imageInfo() instead.
      *  Return the width/height of the underlying device. The current drawable
      *  area may be small (due to clipping or saveLayer). For a canvas with
      *  no device, 0,0 will be returned.
      */
     SkISize getDeviceSize() const;
 
-    /** Return the canvas' device object, which may be null. The device holds
-        the bitmap of the pixels that the canvas draws into. The reference count
-        of the returned device is not changed by this call.
-    */
+    /**
+     *  DEPRECATED.
+     *  Return the canvas' device object, which may be null. The device holds
+     *  the bitmap of the pixels that the canvas draws into. The reference count
+     *  of the returned device is not changed by this call.
+     */
     SkBaseDevice* getDevice() const;
 
     /**
@@ -126,6 +135,20 @@
     ///////////////////////////////////////////////////////////////////////////
 
     /**
+     *  If the canvas has pixels (and is not recording to a picture or other
+     *  non-raster target) and has direct access to its pixels (i.e. they are in
+     *  local RAM) return the const-address of those pixels, and if not null,
+     *  return the ImageInfo and rowBytes. The returned address is only valid
+     *  while the canvas object is in scope and unchanged. Any API calls made on
+     *  canvas (or its parent surface if any) will invalidate the
+     *  returned address (and associated information).
+     *
+     *  On failure, returns NULL and the info and rowBytes parameters are
+     *  ignored.
+     */
+    const void* peekPixels(SkImageInfo* info, size_t* rowBytes);
+
+    /**
      * This enum can be used with read/writePixels to perform a pixel ops to or
      * from an 8888 config other than Skia's native config (SkPMColor). There
      * are three byte orders supported: native, BGRA, and RGBA. Each has a
@@ -1021,6 +1044,9 @@
     // default impl defers to getDevice()->newSurface(info)
     virtual SkSurface* onNewSurface(const SkImageInfo&);
 
+    // default impl defers to its device
+    virtual const void* onPeekPixels(SkImageInfo*, size_t* rowBytes);
+
     // Returns the canvas to be used by DrawIter. Default implementation
     // returns this. Subclasses that encapsulate an indirect canvas may
     // need to overload this method. The impl must keep track of this, as it
@@ -1208,4 +1234,47 @@
 };
 #define SkAutoCommentBlock(...) SK_REQUIRE_LOCAL_VAR(SkAutoCommentBlock)
 
+/**
+ *  If the caller wants read-only access to the pixels in a canvas, it can just
+ *  call canvas->peekPixels(), since that is the fastest way to "peek" at the
+ *  pixels on a raster-backed canvas.
+ *
+ *  If the canvas has pixels, but they are not readily available to the CPU
+ *  (e.g. gpu-backed), then peekPixels() will fail, but readPixels() will
+ *  succeed (though be slower, since it will return a copy of the pixels).
+ *
+ *  SkAutoROCanvasPixels encapsulates these two techniques, trying first to call
+ *  peekPixels() (for performance), but if that fails, calling readPixels() and
+ *  storing the copy locally.
+ *
+ *  The caller must respect the restrictions associated with peekPixels(), since
+ *  that may have been called: The returned information is invalidated if...
+ *      - any API is called on the canvas (or its parent surface if present)
+ *      - the canvas goes out of scope
+ */
+class SkAutoROCanvasPixels : SkNoncopyable {
+public:
+    SkAutoROCanvasPixels(SkCanvas* canvas);
+
+    // returns NULL on failure
+    const void* addr() const { return fAddr; }
+    
+    // undefined if addr() == NULL
+    size_t rowBytes() const { return fRowBytes; }
+    
+    // undefined if addr() == NULL
+    const SkImageInfo& info() const { return fInfo; }
+
+    // helper that, if returns true, installs the pixels into the bitmap. Note
+    // that the bitmap may reference the address returned by peekPixels(), so
+    // the caller must respect the restrictions associated with peekPixels().
+    bool asROBitmap(SkBitmap*) const;
+
+private:
+    SkBitmap    fBitmap;    // used if peekPixels() fails
+    const void* fAddr;      // NULL on failure
+    SkImageInfo fInfo;
+    size_t      fRowBytes;
+};
+
 #endif
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 016e2ba..e3a23be 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -77,6 +77,12 @@
     }
 
     /**
+     *  Return ImageInfo for this device. If the canvas is not backed by pixels
+     *  (cpu or gpu), then the info's ColorType will be kUnknown_SkColorType.
+     */
+    virtual SkImageInfo imageInfo() const;
+
+    /**
      *  Return the bounds of the device in the coordinate space of the root
      *  canvas. The root device will have its top-left at 0,0, but other devices
      *  such as those associated with saveLayer may have a non-zero origin.
@@ -369,7 +375,10 @@
 protected:
     // default impl returns NULL
     virtual SkSurface* newSurface(const SkImageInfo&);
-
+    
+    // default impl returns NULL
+    virtual const void* peekPixels(SkImageInfo*, size_t* rowBytes);
+    
     /**
      *  Leaky properties are those which the device should be applying but it isn't.
      *  These properties will be applied by the draw, when and as it can.
diff --git a/include/core/SkSurface.h b/include/core/SkSurface.h
index 2f277b7..74c5f08 100644
--- a/include/core/SkSurface.h
+++ b/include/core/SkSurface.h
@@ -151,6 +151,18 @@
      */
     void draw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*);
 
+    /**
+     *  If the surface has direct access to its pixels (i.e. they are in local
+     *  RAM) return the const-address of those pixels, and if not null, return
+     *  the ImageInfo and rowBytes. The returned address is only valid while
+     *  the surface object is in scope, and no API call is made on the surface
+     *  or its canvas.
+     *
+     *  On failure, returns NULL and the info and rowBytes parameters are
+     *  ignored.
+     */
+    const void* peekPixels(SkImageInfo* info, size_t* rowBytes);
+
 protected:
     SkSurface(int width, int height);
     SkSurface(const SkImageInfo&);
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 53e15a5..15e56a3 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1128,8 +1128,9 @@
 
 static SkBitmap capture_bitmap(SkCanvas* canvas) {
     SkBitmap bm;
-    const SkBitmap& src = canvas->getDevice()->accessBitmap(false);
-    src.copyTo(&bm, src.config());
+    if (bm.allocPixels(canvas->imageInfo())) {
+        canvas->readPixels(&bm, 0, 0);
+    }
     return bm;
 }
 
diff --git a/samplecode/SampleCircle.cpp b/samplecode/SampleCircle.cpp
index b101a1f..9cc927e 100644
--- a/samplecode/SampleCircle.cpp
+++ b/samplecode/SampleCircle.cpp
@@ -71,12 +71,6 @@
         }
     }
 
-    static void blowup(SkCanvas* canvas, const SkIRect& src, const SkRect& dst) {
-        SkBaseDevice* device = canvas->getDevice();
-        const SkBitmap& bm = device->accessBitmap(false);
-        canvas->drawBitmapRect(bm, &src, dst, NULL);
-    }
-
     static void make_poly(SkPath* path, int n) {
         if (n <= 0) {
             return;
diff --git a/samplecode/SampleLayers.cpp b/samplecode/SampleLayers.cpp
index 483943d..bc8b873 100644
--- a/samplecode/SampleLayers.cpp
+++ b/samplecode/SampleLayers.cpp
@@ -42,10 +42,10 @@
     SkCanvas::LayerIter iter(canvas, true);
     int index = 0;
     while (!iter.done()) {
-        const SkBitmap& bm = iter.device()->accessBitmap(false);
+        SkImageInfo info = iter.device()->imageInfo();
         const SkIRect& clip = iter.clip().getBounds();
         SkDebugf("Layer[%d] bitmap [%d %d] X=%d Y=%d clip=[%d %d %d %d] alpha=%d\n", index++,
-                 bm.width(), bm.height(), iter.x(), iter.y(),
+                 info.width(), info.height(), iter.x(), iter.y(),
                  clip.fLeft, clip.fTop, clip.fRight, clip.fBottom,
                  iter.paint().getAlpha());
         iter.next();
diff --git a/src/core/SkBitmapDevice.cpp b/src/core/SkBitmapDevice.cpp
index 9dde6e1..374bef9 100644
--- a/src/core/SkBitmapDevice.cpp
+++ b/src/core/SkBitmapDevice.cpp
@@ -54,6 +54,10 @@
 SkBitmapDevice::~SkBitmapDevice() {
 }
 
+SkImageInfo SkBitmapDevice::imageInfo() const {
+    return fBitmap.info();
+}
+
 void SkBitmapDevice::replaceBitmapBackendForRasterSurface(const SkBitmap& bm) {
     SkASSERT(bm.width() == fBitmap.width());
     SkASSERT(bm.height() == fBitmap.height());
@@ -386,6 +390,16 @@
     return SkSurface::NewRaster(info);
 }
 
+const void* SkBitmapDevice::peekPixels(SkImageInfo* info, size_t* rowBytes) {
+    if (fBitmap.getPixels() && fBitmap.asImageInfo(info)) {
+        if (rowBytes) {
+            *rowBytes = fBitmap.rowBytes();
+        }
+        return fBitmap.getPixels();
+    }
+    return NULL;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkBitmapDevice::filterTextFlags(const SkPaint& paint, TextFlags* flags) {
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index ed8274d..f5e91ff 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -992,6 +992,55 @@
     return dev ? dev->newSurface(info) : NULL;
 }
 
+SkImageInfo SkCanvas::imageInfo() const {
+    SkBaseDevice* dev = this->getDevice();
+    if (dev) {
+        return dev->imageInfo();
+    } else {
+        // TODO: need a real unknown for alphatype it seems.
+        SkAlphaType unknownAlphaType = kIgnore_SkAlphaType;
+        return SkImageInfo::Make(0, 0, kUnknown_SkColorType, unknownAlphaType);
+    }
+}
+
+const void* SkCanvas::peekPixels(SkImageInfo* info, size_t* rowBytes) {
+    return this->onPeekPixels(info, rowBytes);
+}
+
+const void* SkCanvas::onPeekPixels(SkImageInfo* info, size_t* rowBytes) {
+    SkBaseDevice* dev = this->getDevice();
+    return dev ? dev->peekPixels(info, rowBytes) : NULL;
+}
+
+SkAutoROCanvasPixels::SkAutoROCanvasPixels(SkCanvas* canvas) {
+    fAddr = canvas->peekPixels(&fInfo, &fRowBytes);
+    if (NULL == fAddr) {
+        fInfo = canvas->imageInfo();
+        if (kUnknown_SkColorType == fInfo.colorType() ||
+            !fBitmap.allocPixels(fInfo))
+        {
+            return; // failure, fAddr is NULL
+        }
+        fBitmap.lockPixels();
+        if (!canvas->readPixels(&fBitmap, 0, 0)) {
+            return; // failure, fAddr is NULL
+        }
+        fAddr = fBitmap.getPixels();
+        fRowBytes = fBitmap.rowBytes();
+    }
+    SkASSERT(fAddr);    // success
+}
+
+bool SkAutoROCanvasPixels::asROBitmap(SkBitmap* bitmap) const {
+    if (fAddr) {
+        return bitmap->installPixels(fInfo, const_cast<void*>(fAddr), fRowBytes,
+                                     NULL, NULL);
+    } else {
+        bitmap->reset();
+        return false;
+    }
+}
+
 /////////////////////////////////////////////////////////////////////////////
 
 void SkCanvas::internalDrawBitmap(const SkBitmap& bitmap,
diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index 9ce8b6b..364b106 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -65,6 +65,12 @@
     return *fMetaData;
 }
 
+// TODO: should make this guy pure-virtual.
+SkImageInfo SkBaseDevice::imageInfo() const {
+    return SkImageInfo::Make(this->width(), this->height(),
+                             kUnknown_SkColorType, kIgnore_SkAlphaType);
+}
+
 const SkBitmap& SkBaseDevice::accessBitmap(bool changePixels) {
     const SkBitmap& bitmap = this->onAccessBitmap();
     if (changePixels) {
@@ -117,3 +123,5 @@
 }
 
 SkSurface* SkBaseDevice::newSurface(const SkImageInfo&) { return NULL; }
+
+const void* SkBaseDevice::peekPixels(SkImageInfo*, size_t*) { return NULL; }
diff --git a/src/core/SkPictureRecord.h b/src/core/SkPictureRecord.h
index 0df120b..eaa5e73 100644
--- a/src/core/SkPictureRecord.h
+++ b/src/core/SkPictureRecord.h
@@ -221,6 +221,9 @@
 
 protected:
     virtual SkSurface* onNewSurface(const SkImageInfo&) SK_OVERRIDE;
+    const void* onPeekPixels(SkImageInfo*, size_t*) SK_OVERRIDE {
+        return NULL;
+    }
 
     // Return fontmetrics.fTop,fBottom in topbot[0,1], after they have been
     // tweaked by paint.computeFastBounds().
diff --git a/src/image/SkImagePriv.h b/src/image/SkImagePriv.h
index 8883e2c..bf28f59 100644
--- a/src/image/SkImagePriv.h
+++ b/src/image/SkImagePriv.h
@@ -14,8 +14,6 @@
 class SkPicture;
 
 extern SkBitmap::Config SkImageInfoToBitmapConfig(const SkImageInfo&);
-extern SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType);
-extern SkColorType SkBitmapConfigToColorType(SkBitmap::Config);
 
 // Call this if you explicitly want to use/share this pixelRef in the image
 extern SkImage* SkNewImageFromPixelRef(const SkImageInfo&, SkPixelRef*,
diff --git a/src/image/SkSurface.cpp b/src/image/SkSurface.cpp
index cb029c8..4b5fb68 100644
--- a/src/image/SkSurface.cpp
+++ b/src/image/SkSurface.cpp
@@ -121,3 +121,8 @@
                      const SkPaint* paint) {
     return asSB(this)->onDraw(canvas, x, y, paint);
 }
+
+const void* SkSurface::peekPixels(SkImageInfo* info, size_t* rowBytes) {
+    return this->getCanvas()->peekPixels(info, rowBytes);
+}
+
diff --git a/tests/SkpSkGrTest.cpp b/tests/SkpSkGrTest.cpp
index 02aabbe..d1d38df 100644
--- a/tests/SkpSkGrTest.cpp
+++ b/tests/SkpSkGrTest.cpp
@@ -453,7 +453,11 @@
         SkGpuDevice grDevice(context, texture.get());
         SkCanvas grCanvas(&grDevice);
         drawPict(pic, &grCanvas, fScaleOversized ? scale : 1);
-        const SkBitmap& grBitmap = grDevice.accessBitmap(false);
+
+        SkBitmap grBitmap;
+        grBitmap.allocPixels(grCanvas.imageInfo());
+        grCanvas.readPixels(&grBitmap, 0, 0);
+        
         if (fTestStep == kCompareBits) {
             fPixelError = similarBits(grBitmap, bitmap);
             int skTime = timePict(pic, &skCanvas);
diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index aa457c7..fcd0986 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -22,27 +22,37 @@
 
 enum SurfaceType {
     kRaster_SurfaceType,
+    kRasterDirect_SurfaceType,
     kGpu_SurfaceType,
     kPicture_SurfaceType
 };
 
-static SkSurface* createSurface(SurfaceType surfaceType, GrContext* context) {
-    static const SkImageInfo info = SkImageInfo::MakeN32Premul(10, 10);
+static const int gSurfaceSize = 10;
+static SkPMColor gSurfaceStorage[gSurfaceSize * gSurfaceSize];
+
+static SkSurface* createSurface(SurfaceType surfaceType, GrContext* context,
+                                SkImageInfo* requestedInfo = NULL) {
+    static const SkImageInfo info = SkImageInfo::MakeN32Premul(gSurfaceSize,
+                                                               gSurfaceSize);
+
+    if (requestedInfo) {
+        *requestedInfo = info;
+    }
 
     switch (surfaceType) {
-    case kRaster_SurfaceType:
-        return SkSurface::NewRaster(info);
-    case kGpu_SurfaceType:
+        case kRaster_SurfaceType:
+            return SkSurface::NewRaster(info);
+        case kRasterDirect_SurfaceType:
+            return SkSurface::NewRasterDirect(info, gSurfaceStorage,
+                                              info.minRowBytes());
+        case kGpu_SurfaceType:
 #if SK_SUPPORT_GPU
-        SkASSERT(NULL != context);
-        return SkSurface::NewRenderTarget(context, info);
-#else
-        SkASSERT(0);
+            return context ? SkSurface::NewRenderTarget(context, info) : NULL;
 #endif
-    case kPicture_SurfaceType:
-        return SkSurface::NewPicture(info.fWidth, info.fHeight);
+            break;
+        case kPicture_SurfaceType:
+            return SkSurface::NewPicture(info.fWidth, info.fHeight);
     }
-    SkASSERT(0);
     return NULL;
 }
 
@@ -117,14 +127,14 @@
         { kPicture_ImageType,       false   },
         { kCodec_ImageType,         false   },
     };
-
+    
     const SkColor color = SK_ColorRED;
     const SkPMColor pmcolor = SkPreMultiplyColor(color);
-
+    
     for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
         SkImageInfo info;
         size_t rowBytes;
-
+        
         SkAutoTUnref<SkImage> image(createImage(gRec[i].fType, NULL, color));
         if (!image.get()) {
             continue;   // gpu may not be enabled
@@ -137,13 +147,65 @@
             REPORTER_ASSERT(reporter, 10 == info.fHeight);
             REPORTER_ASSERT(reporter, kPMColor_SkColorType == info.fColorType);
             REPORTER_ASSERT(reporter, kPremul_SkAlphaType == info.fAlphaType ||
-                                      kOpaque_SkAlphaType == info.fAlphaType);
+                            kOpaque_SkAlphaType == info.fAlphaType);
             REPORTER_ASSERT(reporter, info.minRowBytes() <= rowBytes);
             REPORTER_ASSERT(reporter, pmcolor == *(const SkPMColor*)addr);
         }
     }
 }
 
+static void test_canvaspeek(skiatest::Reporter* reporter,
+                            GrContextFactory* factory) {
+    static const struct {
+        SurfaceType fType;
+        bool        fPeekShouldSucceed;
+    } gRec[] = {
+        { kRaster_SurfaceType,          true    },
+        { kRasterDirect_SurfaceType,    true    },
+#if SK_SUPPORT_GPU
+        { kGpu_SurfaceType,             false   },
+#endif
+        { kPicture_SurfaceType,         false   },
+    };
+
+    const SkColor color = SK_ColorRED;
+    const SkPMColor pmcolor = SkPreMultiplyColor(color);
+
+    GrContext* context = NULL;
+#if SK_SUPPORT_GPU
+    context = factory->get(GrContextFactory::kNative_GLContextType);
+#endif
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
+        SkImageInfo info, requestInfo;
+        size_t rowBytes;
+
+        SkAutoTUnref<SkSurface> surface(createSurface(gRec[i].fType, context,
+                                                      &requestInfo));
+        surface->getCanvas()->clear(color);
+
+        const void* addr = surface->getCanvas()->peekPixels(&info, &rowBytes);
+        bool success = (NULL != addr);
+        REPORTER_ASSERT(reporter, gRec[i].fPeekShouldSucceed == success);
+
+        SkImageInfo info2;
+        size_t rb2;
+        const void* addr2 = surface->peekPixels(&info2, &rb2);
+
+        if (success) {
+            REPORTER_ASSERT(reporter, requestInfo == info);
+            REPORTER_ASSERT(reporter, requestInfo.minRowBytes() <= rowBytes);
+            REPORTER_ASSERT(reporter, pmcolor == *(const SkPMColor*)addr);
+
+            REPORTER_ASSERT(reporter, addr2 == addr);
+            REPORTER_ASSERT(reporter, info2 == info);
+            REPORTER_ASSERT(reporter, rb2 == rowBytes);
+        } else {
+            REPORTER_ASSERT(reporter, NULL == addr2);
+        }
+    }
+}
+
 static void TestSurfaceCopyOnWrite(skiatest::Reporter* reporter, SurfaceType surfaceType,
                                    GrContext* context) {
     // Verify that the right canvas commands trigger a copy on write
@@ -335,7 +397,10 @@
     TestSurfaceWritableAfterSnapshotRelease(reporter, kPicture_SurfaceType, NULL);
     TestSurfaceNoCanvas(reporter, kRaster_SurfaceType, NULL, SkSurface::kDiscard_ContentChangeMode);
     TestSurfaceNoCanvas(reporter, kRaster_SurfaceType, NULL, SkSurface::kRetain_ContentChangeMode);
+
     test_imagepeek(reporter);
+    test_canvaspeek(reporter, factory);
+
 #if SK_SUPPORT_GPU
     TestGetTexture(reporter, kRaster_SurfaceType, NULL);
     TestGetTexture(reporter, kPicture_SurfaceType, NULL);