wtf/CheckedArithmetic.h delegates to base/numerics/safe_math.h.

third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp

 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 37 matching lines @@
 #include "platform/image-encoders/skia/WEBPImageEncoder.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebExternalTextureMailbox.h"
 #include "public/platform/WebGraphicsContext3D.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
 #include "skia/ext/texture_handle.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/gpu/GrContext.h"
 #include "third_party/skia/include/gpu/gl/GrGLTypes.h"
 #include "wtf/ArrayBufferContents.h"
+#include "wtf/CheckedNumeric.h"
 #include "wtf/MathExtras.h"
 #include "wtf/Vector.h"
 #include "wtf/text/Base64.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 PassOwnPtr<ImageBuffer> ImageBuffer::create(PassOwnPtr<ImageBufferSurface> surface)
 {
     if (!surface->isValid())
@@ skipping 209 matching lines @@
 
 void ImageBuffer::flushGpu(FlushReason reason)
 {
     if (m_surface->canvas()) {
         m_surface->flushGpu(reason);
     }
 }
 
 bool ImageBuffer::getImageData(Multiply multiplied, const IntRect& rect, WTF::ArrayBufferContents& contents) const
 {
-    Checked<int, RecordOverflow> dataSize = 4;
+    CheckedNumeric<int> dataSize = 4;
     dataSize *= rect.width();
     dataSize *= rect.height();
-    if (dataSize.hasOverflowed())
+    if (!dataSize.IsValid())
         return false;
 
     if (!isSurfaceValid()) {
         size_t allocSizeInBytes = rect.width() * rect.height() * 4;
         void* data;
         WTF::ArrayBufferContents::allocateMemoryOrNull(allocSizeInBytes, WTF::ArrayBufferContents::ZeroInitialize, data);
         if (!data)
             return false;
         WTF::ArrayBufferContents result(data, allocSizeInBytes, WTF::ArrayBufferContents::NotShared);
         result.transfer(contents);
@@ skipping 54 matching lines @@
     SkAlphaType alphaType = (multiplied == Premultiplied) ? kPremul_SkAlphaType : kUnpremul_SkAlphaType;
     SkImageInfo info = SkImageInfo::Make(sourceRect.width(), sourceRect.height(), kRGBA_8888_SkColorType, alphaType);
     m_surface->writePixels(info, srcAddr, srcBytesPerRow, destX, destY);
 }
 
 void ImageBuffer::updateGPUMemoryUsage() const
 {
     if (this->isAccelerated()) {
         // If image buffer is accelerated, we should keep track of GPU memory usage.
         int gpuBufferCount = 2;
-        Checked<intptr_t, RecordOverflow> checkedGPUUsage = 4 * gpuBufferCount;
+        CheckedNumeric<intptr_t> checkedGPUUsage = 4 * gpuBufferCount;
         checkedGPUUsage *= this->size().width();
         checkedGPUUsage *= this->size().height();
-        intptr_t gpuMemoryUsage;
-        if (checkedGPUUsage.safeGet(gpuMemoryUsage) == CheckedState::DidOverflow)
-            gpuMemoryUsage = std::numeric_limits<intptr_t>::max();
+        intptr_t gpuMemoryUsage = checkedGPUUsage.ValueOrDefault(std::numeric_limits<intptr_t>::max());
 
         s_globalGPUMemoryUsage += (gpuMemoryUsage - m_gpuMemoryUsage);
         m_gpuMemoryUsage = gpuMemoryUsage;
     } else if (m_gpuMemoryUsage > 0) {
         // In case of switching from accelerated to non-accelerated mode,
         // the GPU memory usage needs to be updated too.
         s_globalGPUMemoryUsage -= m_gpuMemoryUsage;
         m_gpuMemoryUsage = 0;
     }
 }
@@ skipping 23 matching lines @@
     ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
 
     Vector<unsigned char> result;
     if (!encodeImage(mimeType, quality, &result))
         return "data:,";
 
     return "data:" + mimeType + ";base64," + base64Encode(result);
 }
 
 } // namespace blink