48a4cbc668
git-svn-id: http://skia.googlecode.com/svn/trunk@3292 2bbb7eff-a529-9590-31e7-b0007b416f81
96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkDeviceProfile_DEFINED
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#define SkDeviceProfile_DEFINED
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#include "SkRefCnt.h"
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class SkDeviceProfile : public SkRefCnt {
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public:
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enum LCDConfig {
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kNone_LCDConfig, // disables LCD text rendering, uses A8 instead
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kRGB_Horizontal_LCDConfig,
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kBGR_Horizontal_LCDConfig,
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kRGB_Vertical_LCDConfig,
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kBGR_Vertical_LCDConfig,
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};
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enum FontHintLevel {
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kNone_FontHintLevel,
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kSlight_FontHintLevel,
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kNormal_FontHintLevel,
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kFull_FontHintLevel,
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kAuto_FontHintLevel,
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};
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/**
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* gammaExp is typically between 1.0 and 2.2. For no gamma adjustment,
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* specify 1.0
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*
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* contrastScale will be pinned between 0.0 and 1.0. For no contrast
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* adjustment, specify 0.0
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*
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* @param config Describes the LCD layout for this device. If this is set
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* to kNone, then all requests for LCD text will be
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* devolved to A8 antialiasing.
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*
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* @param level The hinting level to be used, IF the paint specifies
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* "default". Otherwise the paint's hinting level will be
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* respected.
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*/
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static SkDeviceProfile* Create(float gammaExp,
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float contrastScale,
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LCDConfig,
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FontHintLevel);
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/**
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* Returns the global default profile, that is used if no global profile is
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* specified with SetGlobal(), or if NULL is specified to SetGlobal().
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* The references count is *not* incremented, and the caller should not
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* call unref().
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*/
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static SkDeviceProfile* GetDefault();
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/**
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* Return the current global profile (or the default if no global had yet
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* been set) and increment its reference count. The call *must* call unref()
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* when it is done using it.
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*/
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static SkDeviceProfile* RefGlobal();
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/**
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* Make the specified profile be the global value for all subsequently
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* instantiated devices. Does not affect any existing devices.
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* Increments the reference count on the profile.
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* Specify NULL for the "identity" profile (where there is no gamma or
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* contrast correction).
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*/
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static void SetGlobal(SkDeviceProfile*);
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float getFontGammaExponent() const { return fGammaExponent; }
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float getFontContrastScale() const { return fContrastScale; }
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/**
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* Given a luminance byte (0 for black, 0xFF for white), generate a table
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* that applies the gamma/contrast settings to linear coverage values.
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*/
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void generateTableForLuminanceByte(U8CPU lumByte, uint8_t table[256]) const;
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private:
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SkDeviceProfile(float gammaExp, float contrastScale, LCDConfig,
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FontHintLevel);
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float fGammaExponent;
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float fContrastScale;
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LCDConfig fLCDConfig;
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FontHintLevel fFontHintLevel;
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};
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#endif
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