The Tor Browser: gfx/angle/src/libGLESv2/renderer/vertexconversion.h@129ffea94266 (annotated)

gfx/angle/src/libGLESv2/renderer/vertexconversion.h@129ffea94266 (annotated)

gfx/angle/src/libGLESv2/renderer/vertexconversion.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 //
 // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // vertexconversion.h: A library of vertex conversion classes that can be used to build
 // the FormatConverter objects used by the buffer conversion system.
 #ifndef LIBGLESV2_VERTEXCONVERSION_H_
 #define LIBGLESV2_VERTEXCONVERSION_H_
 namespace rx
 {
 // Conversion types:
 // static const bool identity: true if this is an identity transform, false otherwise
 // static U convert(T): convert a single element from the input type to the output type
 // typedef ... OutputType: the type produced by this conversion
 template <class T>
 struct Identity
 {
     static const bool identity = true;
     typedef T OutputType;
     static T convert(T x)
     {
         return x;
     }
 };
 template <class FromT, class ToT>
 struct Cast
 {
     static const bool identity = false;
     typedef ToT OutputType;
     static ToT convert(FromT x)
     {
         return static_cast<ToT>(x);
     }
 };
 template <class T>
 struct Cast<T, T>
 {
     static const bool identity = true;
     typedef T OutputType;
     static T convert(T x)
     {
         return static_cast<T>(x);
     }
 };
 template <class T>
 struct Normalize
 {
     static const bool identity = false;
     typedef float OutputType;
     static float convert(T x)
     {
         typedef std::numeric_limits<T> NL;
         float f = static_cast<float>(x);
         if (NL::is_signed)
         {
             // const float => VC2008 computes it at compile time
             // static const float => VC2008 computes it the first time we get here, stores it to memory with static guard and all that.
             const float divisor = 1.0f/(2*static_cast<float>(NL::max())+1);
             return (2*f+1)*divisor;
         }
         else
         {
             return f/NL::max();
         }
     }
 };
 template <class FromType, std::size_t ScaleBits>
 struct FixedToFloat
 {
     static const bool identity = false;
     typedef float OutputType;
     static float convert(FromType x)
     {
         const float divisor = 1.0f / static_cast<float>(static_cast<FromType>(1) << ScaleBits);
         return static_cast<float>(x) * divisor;
     }
 };
 // Widen types:
 // static const unsigned int initialWidth: number of components before conversion
 // static const unsigned int finalWidth: number of components after conversion
 // Float is supported at any size.
 template <std::size_t N>
 struct NoWiden
 {
     static const std::size_t initialWidth = N;
     static const std::size_t finalWidth = N;
 };
 // SHORT, norm-SHORT, norm-UNSIGNED_SHORT are supported but only with 2 or 4 components
 template <std::size_t N>
 struct WidenToEven
 {
     static const std::size_t initialWidth = N;
     static const std::size_t finalWidth = N+(N&1);
 };
 template <std::size_t N>
 struct WidenToFour
 {
     static const std::size_t initialWidth = N;
     static const std::size_t finalWidth = 4;
 };
 // Most types have 0 and 1 that are just that.
 template <class T>
 struct SimpleDefaultValues
 {
     static T zero() { return static_cast<T>(0); }
     static T one() { return static_cast<T>(1); }
 };
 // But normalised types only store [0,1] or [-1,1] so 1.0 is represented by the max value.
 template <class T>
 struct NormalizedDefaultValues
 {
     static T zero() { return static_cast<T>(0); }
     static T one() { return std::numeric_limits<T>::max(); }
 };
 // Converter:
 // static const bool identity: true if this is an identity transform (with no widening)
 // static const std::size_t finalSize: number of bytes per output vertex
 // static void convertArray(const void *in, std::size_t stride, std::size_t n, void *out): convert an array of vertices. Input may be strided, but output will be unstrided.
 template <class InT, class WidenRule, class Converter, class DefaultValueRule = SimpleDefaultValues<InT> >
 struct VertexDataConverter
 {
     typedef typename Converter::OutputType OutputType;
     typedef InT InputType;
     static const bool identity = (WidenRule::initialWidth == WidenRule::finalWidth) && Converter::identity;
     static const std::size_t finalSize = WidenRule::finalWidth * sizeof(OutputType);
     static void convertArray(const InputType *in, std::size_t stride, std::size_t n, OutputType *out)
     {
         for (std::size_t i = 0; i < n; i++)
         {
             const InputType *ein = pointerAddBytes(in, i * stride);
             copyComponent(out, ein, 0, static_cast<OutputType>(DefaultValueRule::zero()));
             copyComponent(out, ein, 1, static_cast<OutputType>(DefaultValueRule::zero()));
             copyComponent(out, ein, 2, static_cast<OutputType>(DefaultValueRule::zero()));
             copyComponent(out, ein, 3, static_cast<OutputType>(DefaultValueRule::one()));
             out += WidenRule::finalWidth;
         }
     }
     static void convertArray(const void *in, std::size_t stride, std::size_t n, void *out)
     {
         return convertArray(static_cast<const InputType*>(in), stride, n, static_cast<OutputType*>(out));
     }
   private:
     // Advance the given pointer by a number of bytes (not pointed-to elements).
     template <class T>
     static T *pointerAddBytes(T *basePtr, std::size_t numBytes)
     {
         return reinterpret_cast<T *>(reinterpret_cast<uintptr_t>(basePtr) + numBytes);
     }
     static void copyComponent(OutputType *out, const InputType *in, std::size_t elementindex, OutputType defaultvalue)
     {
         if (WidenRule::finalWidth > elementindex)
         {
             if (WidenRule::initialWidth > elementindex)
             {
                 out[elementindex] = Converter::convert(in[elementindex]);
             }
             else
             {
                 out[elementindex] = defaultvalue;
             }
         }
     }
 };
 }
 #endif   // LIBGLESV2_VERTEXCONVERSION_H_

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gfx/angle/src/libGLESv2/renderer/vertexconversion.h@129ffea94266 (annotated)

gfx/angle/src/libGLESv2/renderer/vertexconversion.h