1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkDeviceProfile.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,98 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkDeviceProfile_DEFINED
1.12 +#define SkDeviceProfile_DEFINED
1.13 +
1.14 +#include "SkRefCnt.h"
1.15 +
1.16 +class SkDeviceProfile : public SkRefCnt {
1.17 +public:
1.18 + SK_DECLARE_INST_COUNT(SkDeviceProfile)
1.19 +
1.20 + enum LCDConfig {
1.21 + kNone_LCDConfig, // disables LCD text rendering, uses A8 instead
1.22 + kRGB_Horizontal_LCDConfig,
1.23 + kBGR_Horizontal_LCDConfig,
1.24 + kRGB_Vertical_LCDConfig,
1.25 + kBGR_Vertical_LCDConfig
1.26 + };
1.27 +
1.28 + enum FontHintLevel {
1.29 + kNone_FontHintLevel,
1.30 + kSlight_FontHintLevel,
1.31 + kNormal_FontHintLevel,
1.32 + kFull_FontHintLevel,
1.33 + kAuto_FontHintLevel
1.34 + };
1.35 +
1.36 + /**
1.37 + * gammaExp is typically between 1.0 and 2.2. For no gamma adjustment,
1.38 + * specify 1.0
1.39 + *
1.40 + * contrastScale will be pinned between 0.0 and 1.0. For no contrast
1.41 + * adjustment, specify 0.0
1.42 + *
1.43 + * @param config Describes the LCD layout for this device. If this is set
1.44 + * to kNone, then all requests for LCD text will be
1.45 + * devolved to A8 antialiasing.
1.46 + *
1.47 + * @param level The hinting level to be used, IF the paint specifies
1.48 + * "default". Otherwise the paint's hinting level will be
1.49 + * respected.
1.50 + */
1.51 + static SkDeviceProfile* Create(float gammaExp,
1.52 + float contrastScale,
1.53 + LCDConfig,
1.54 + FontHintLevel);
1.55 +
1.56 + /**
1.57 + * Returns the global default profile, that is used if no global profile is
1.58 + * specified with SetGlobal(), or if NULL is specified to SetGlobal().
1.59 + * The references count is *not* incremented, and the caller should not
1.60 + * call unref().
1.61 + */
1.62 + static SkDeviceProfile* GetDefault();
1.63 +
1.64 + /**
1.65 + * Return the current global profile (or the default if no global had yet
1.66 + * been set) and increment its reference count. The call *must* call unref()
1.67 + * when it is done using it.
1.68 + */
1.69 + static SkDeviceProfile* RefGlobal();
1.70 +
1.71 + /**
1.72 + * Make the specified profile be the global value for all subsequently
1.73 + * instantiated devices. Does not affect any existing devices.
1.74 + * Increments the reference count on the profile.
1.75 + * Specify NULL for the "identity" profile (where there is no gamma or
1.76 + * contrast correction).
1.77 + */
1.78 + static void SetGlobal(SkDeviceProfile*);
1.79 +
1.80 + float getFontGammaExponent() const { return fGammaExponent; }
1.81 + float getFontContrastScale() const { return fContrastScale; }
1.82 +
1.83 + /**
1.84 + * Given a luminance byte (0 for black, 0xFF for white), generate a table
1.85 + * that applies the gamma/contrast settings to linear coverage values.
1.86 + */
1.87 + void generateTableForLuminanceByte(U8CPU lumByte, uint8_t table[256]) const;
1.88 +
1.89 +private:
1.90 + SkDeviceProfile(float gammaExp, float contrastScale, LCDConfig,
1.91 + FontHintLevel);
1.92 +
1.93 + float fGammaExponent;
1.94 + float fContrastScale;
1.95 + LCDConfig fLCDConfig;
1.96 + FontHintLevel fFontHintLevel;
1.97 +
1.98 + typedef SkRefCnt INHERITED;
1.99 +};
1.100 +
1.101 +#endif
