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skia2/include/core/SkPreConfig.h
digit@google.com 47ebbcc7ab Use the NDK's cpu-features library when building skia for Chromium/Android. 
This patch ensures that when Skia is built for Chromium, it will
always use the Android NDK's cpu-features helper library to detect
NEON at runtime.

This is needed because sandboxed Chromium renderer processes cannot
access /proc, and the probing performed in SkUtilsArm.cpp will never
work. As such, the NEON code paths will never be used even when the
device supports them.

Chromium has special code that ensures that the browser process
passes the CPU features flags to every renderer process, but
Skia needs to use android_getCpuFeatures() to get them.

See http://crbug.com/164154 for full details.
Review URL: https://codereview.appspot.com/7102045

git-svn-id: http://skia.googlecode.com/svn/trunk@7149 2bbb7eff-a529-9590-31e7-b0007b416f81
2013-01-14 14:58:22 +00:00

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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPreConfig_DEFINED
#define SkPreConfig_DEFINED
#ifdef WEBKIT_VERSION_MIN_REQUIRED
#include "config.h"
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_BUILD_FOR_ANDROID) && !defined(SK_BUILD_FOR_ANDROID_NDK) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_PALM) && !defined(SK_BUILD_FOR_WINCE) && !defined(SK_BUILD_FOR_WIN32) && !defined(SK_BUILD_FOR_UNIX) && !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_SDL) && !defined(SK_BUILD_FOR_BREW) && !defined(SK_BUILD_FOR_NACL)
#ifdef __APPLE__
#include "TargetConditionals.h"
#endif
#if defined(PALMOS_SDK_VERSION)
#define SK_BUILD_FOR_PALM
#elif defined(UNDER_CE)
#define SK_BUILD_FOR_WINCE
#elif defined(WIN32)
#define SK_BUILD_FOR_WIN32
#elif defined(__SYMBIAN32__)
#define SK_BUILD_FOR_WIN32
#elif defined(ANDROID_NDK)
#define SK_BUILD_FOR_ANDROID_NDK
#elif defined(ANDROID)
#define SK_BUILD_FOR_ANDROID
#elif defined(linux) || defined(__FreeBSD__) || defined(__OpenBSD__) || \
defined(__sun) || defined(__NetBSD__) || defined(__DragonFly__) || \
defined(__GLIBC__) || defined(__GNU__)
#define SK_BUILD_FOR_UNIX
#elif TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
#define SK_BUILD_FOR_IOS
#else
#define SK_BUILD_FOR_MAC
#endif
#endif
/* Even if the user only defined the NDK variant we still need to build
* the default Android code. Therefore, when attempting to include/exclude
* something from the NDK variant check first that we are building for
* Android then check the status of the NDK define.
*/
#if defined(SK_BUILD_FOR_ANDROID_NDK) && !defined(SK_BUILD_FOR_ANDROID)
#define SK_BUILD_FOR_ANDROID
#endif
// USE_CHROMIUM_SKIA is defined when building Skia for the Chromium
// browser.
#if defined(USE_CHROMIUM_SKIA)
#define SK_BUILD_FOR_CHROMIUM
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_DEBUG) && !defined(SK_RELEASE)
#ifdef NDEBUG
#define SK_RELEASE
#else
#define SK_DEBUG
#endif
#endif
#ifdef SK_BUILD_FOR_WIN32
#if !defined(SK_RESTRICT)
#define SK_RESTRICT __restrict
#endif
#if !defined(SK_WARN_UNUSED_RESULT)
#define SK_WARN_UNUSED_RESULT
#endif
#include "sk_stdint.h"
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_RESTRICT)
#define SK_RESTRICT __restrict__
#endif
#if !defined(SK_WARN_UNUSED_RESULT)
#define SK_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_SCALAR_IS_FLOAT) && !defined(SK_SCALAR_IS_FIXED)
#define SK_SCALAR_IS_FLOAT
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_CPU_BENDIAN) && !defined(SK_CPU_LENDIAN)
#if defined (__ppc__) || defined(__ppc64__)
#define SK_CPU_BENDIAN
#else
#define SK_CPU_LENDIAN
#endif
#endif
//////////////////////////////////////////////////////////////////////
/**
* SK_CPU_SSE_LEVEL
*
* If defined, SK_CPU_SSE_LEVEL should be set to the highest supported level.
* On non-intel CPU this should be undefined.
*/
#define SK_CPU_SSE_LEVEL_SSE1 10
#define SK_CPU_SSE_LEVEL_SSE2 20
#define SK_CPU_SSE_LEVEL_SSE3 30
#define SK_CPU_SSE_LEVEL_SSSE3 31
// Are we in GCC?
#ifndef SK_CPU_SSE_LEVEL
#if defined(__SSE2__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
#elif defined(__SSE3__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE3
#elif defined(__SSSE3__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSSE3
#endif
#endif
// Are we in VisualStudio?
#ifndef SK_CPU_SSE_LEVEL
#if _M_IX86_FP == 1
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE1
#elif _M_IX86_FP >= 2
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
#endif
#endif
// 64bit intel guarantees at least SSE2
#if defined(__x86_64__) || defined(_WIN64)
#if !defined(SK_CPU_SSE_LEVEL) || (SK_CPU_SSE_LEVEL < SK_CPU_SSE_LEVEL_SSE2)
#undef SK_CPU_SSE_LEVEL
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
#endif
#endif
//////////////////////////////////////////////////////////////////////
// ARM defines
#if defined(__arm__) && (!defined(__APPLE__) || !TARGET_IPHONE_SIMULATOR)
#define SK_CPU_ARM
#if defined(__GNUC__)
#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
|| defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
#define SK_ARM_ARCH 7
#elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
|| defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
|| defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
#define SK_ARM_ARCH 6
#elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
|| defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
|| defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
#define SK_ARM_ARCH 5
#elif defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || defined(_ARM_ARCH_4)
#define SK_ARM_ARCH 4
#else
#define SK_ARM_ARCH 3
#endif
#if defined(__thumb2__) && (SK_ARM_ARCH >= 6) \
|| !defined(__thumb__) && ((SK_ARM_ARCH > 5) || defined(__ARM_ARCH_5E__) \
|| defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__))
#define SK_ARM_HAS_EDSP
#endif
#endif
#endif
//////////////////////////////////////////////////////////////////////
/**
* THUMB is the only known config where we avoid small branches in
* favor of more complex math.
*/
#if !(defined(__arm__) && defined(__thumb__))
#define SK_CPU_HAS_CONDITIONAL_INSTR
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SKIA_IMPLEMENTATION)
#define SKIA_IMPLEMENTATION 0
#endif
#if defined(SKIA_DLL)
#if defined(WIN32)
#if SKIA_IMPLEMENTATION
#define SK_API __declspec(dllexport)
#else
#define SK_API __declspec(dllimport)
#endif
#else
#define SK_API __attribute__((visibility("default")))
#endif
#else
#define SK_API
#endif
//////////////////////////////////////////////////////////////////////
/**
* Use SK_PURE_FUNC as an attribute to indicate that a function's
* return value only depends on the value of its parameters. This
* can help the compiler optimize out successive calls.
*
* Usage:
* void function(int params) SK_PURE_FUNC;
*/
#if defined(__GNUC__)
# define SK_PURE_FUNC __attribute__((pure))
#else
# define SK_PURE_FUNC /* nothing */
#endif
//////////////////////////////////////////////////////////////////////
/**
* SK_HAS_ATTRIBUTE(<name>) should return true iff the compiler
* supports __attribute__((<name>)). Mostly important because
* Clang doesn't support all of GCC attributes.
*/
#if defined(__has_attribute)
# define SK_HAS_ATTRIBUTE(x) __has_attribute(x)
#elif defined(__GNUC__)
# define SK_HAS_ATTRIBUTE(x) 1
#else
# define SK_HAS_ATTRIBUTE(x) 0
#endif
/**
* SK_ATTRIBUTE_OPTIMIZE_O1 can be used as a function attribute
* to specify individual optimization level of -O1, if the compiler
* supports it.
*
* NOTE: Clang/ARM (r161757) does not support the 'optimize' attribute.
*/
#if SK_HAS_ATTRIBUTE(optimize)
# define SK_ATTRIBUTE_OPTIMIZE_O1 __attribute__((optimize("O1")))
#else
# define SK_ATTRIBUTE_OPTIMIZE_O1 /* nothing */
#endif
#endif
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