make allocPixels throw on failure

src/utils/mac/SkCreateCGImageRef.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 "SkCGUtils.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 203 matching lines @@
     if (NULL == page) {
         return false;
     }
 
     CGRect bounds = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
 
     int w = (int)CGRectGetWidth(bounds);
     int h = (int)CGRectGetHeight(bounds);
 
     SkBitmap bitmap;
-    if (!bitmap.allocPixels(SkImageInfo::MakeN32Premul(w, h))) {
+    if (!bitmap.tryAllocN32Pixels(w, h)) {
         return false;
     }
     bitmap.eraseColor(SK_ColorWHITE);
 
     size_t bitsPerComponent;
     CGBitmapInfo info;
     getBitmapInfo(bitmap, &bitsPerComponent, &info, NULL);
 
     CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
     CGContextRef ctx = CGBitmapContextCreate(bitmap.getPixels(), w, h,
@@ skipping 45 matching lines @@
     CGContextRelease(cg);
     return true;
 }
 
 bool SkCreateBitmapFromCGImage(SkBitmap* dst, CGImageRef image, SkISize* scaleToFit) {
     const int width = scaleToFit ? scaleToFit->width() : SkToInt(CGImageGetWidth(image));
     const int height = scaleToFit ? scaleToFit->height() : SkToInt(CGImageGetHeight(image));
     SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
 
     SkBitmap tmp;
-    if (!tmp.allocPixels(info)) {
+    if (!tmp.tryAllocPixels(info)) {
         return false;
     }
 
     if (!SkCopyPixelsFromCGImage(tmp.info(), tmp.rowBytes(), tmp.getPixels(), image)) {
         return false;
     }
 
     CGImageAlphaInfo cgInfo = CGImageGetAlphaInfo(image);
     switch (cgInfo) {
         case kCGImageAlphaNone:
         case kCGImageAlphaNoneSkipLast:
         case kCGImageAlphaNoneSkipFirst:
             SkASSERT(SkBitmap::ComputeIsOpaque(tmp));
             tmp.setAlphaType(kOpaque_SkAlphaType);
             break;
         default:
             // we don't know if we're opaque or not, so compute it.
             if (SkBitmap::ComputeIsOpaque(tmp)) {
                 tmp.setAlphaType(kOpaque_SkAlphaType);
             }
     }
 
     *dst = tmp;
     return true;
 }