reed@google.com | 48a4cbc | 2012-03-01 19:21:11 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #ifndef SkDeviceProfile_DEFINED |
| 9 | #define SkDeviceProfile_DEFINED |
| 10 | |
| 11 | #include "SkRefCnt.h" |
| 12 | |
| 13 | class SkDeviceProfile : public SkRefCnt { |
| 14 | public: |
robertphillips@google.com | 15e9d3e | 2012-06-21 20:25:03 +0000 | [diff] [blame] | 15 | SK_DECLARE_INST_COUNT(SkDeviceProfile) |
| 16 | |
reed@google.com | 48a4cbc | 2012-03-01 19:21:11 +0000 | [diff] [blame] | 17 | enum LCDConfig { |
| 18 | kNone_LCDConfig, // disables LCD text rendering, uses A8 instead |
| 19 | kRGB_Horizontal_LCDConfig, |
| 20 | kBGR_Horizontal_LCDConfig, |
| 21 | kRGB_Vertical_LCDConfig, |
reed@google.com | 73c48f1 | 2012-07-20 11:35:40 +0000 | [diff] [blame] | 22 | kBGR_Vertical_LCDConfig |
reed@google.com | 48a4cbc | 2012-03-01 19:21:11 +0000 | [diff] [blame] | 23 | }; |
| 24 | |
| 25 | enum FontHintLevel { |
| 26 | kNone_FontHintLevel, |
| 27 | kSlight_FontHintLevel, |
| 28 | kNormal_FontHintLevel, |
| 29 | kFull_FontHintLevel, |
reed@google.com | 73c48f1 | 2012-07-20 11:35:40 +0000 | [diff] [blame] | 30 | kAuto_FontHintLevel |
reed@google.com | 48a4cbc | 2012-03-01 19:21:11 +0000 | [diff] [blame] | 31 | }; |
| 32 | |
| 33 | /** |
| 34 | * gammaExp is typically between 1.0 and 2.2. For no gamma adjustment, |
| 35 | * specify 1.0 |
| 36 | * |
| 37 | * contrastScale will be pinned between 0.0 and 1.0. For no contrast |
| 38 | * adjustment, specify 0.0 |
| 39 | * |
| 40 | * @param config Describes the LCD layout for this device. If this is set |
| 41 | * to kNone, then all requests for LCD text will be |
| 42 | * devolved to A8 antialiasing. |
| 43 | * |
| 44 | * @param level The hinting level to be used, IF the paint specifies |
| 45 | * "default". Otherwise the paint's hinting level will be |
| 46 | * respected. |
| 47 | */ |
| 48 | static SkDeviceProfile* Create(float gammaExp, |
| 49 | float contrastScale, |
| 50 | LCDConfig, |
| 51 | FontHintLevel); |
| 52 | |
| 53 | /** |
| 54 | * Returns the global default profile, that is used if no global profile is |
| 55 | * specified with SetGlobal(), or if NULL is specified to SetGlobal(). |
| 56 | * The references count is *not* incremented, and the caller should not |
| 57 | * call unref(). |
| 58 | */ |
| 59 | static SkDeviceProfile* GetDefault(); |
| 60 | |
| 61 | /** |
| 62 | * Return the current global profile (or the default if no global had yet |
| 63 | * been set) and increment its reference count. The call *must* call unref() |
| 64 | * when it is done using it. |
| 65 | */ |
| 66 | static SkDeviceProfile* RefGlobal(); |
| 67 | |
| 68 | /** |
| 69 | * Make the specified profile be the global value for all subsequently |
| 70 | * instantiated devices. Does not affect any existing devices. |
| 71 | * Increments the reference count on the profile. |
| 72 | * Specify NULL for the "identity" profile (where there is no gamma or |
| 73 | * contrast correction). |
| 74 | */ |
| 75 | static void SetGlobal(SkDeviceProfile*); |
| 76 | |
| 77 | float getFontGammaExponent() const { return fGammaExponent; } |
| 78 | float getFontContrastScale() const { return fContrastScale; } |
| 79 | |
| 80 | /** |
| 81 | * Given a luminance byte (0 for black, 0xFF for white), generate a table |
| 82 | * that applies the gamma/contrast settings to linear coverage values. |
| 83 | */ |
| 84 | void generateTableForLuminanceByte(U8CPU lumByte, uint8_t table[256]) const; |
| 85 | |
| 86 | private: |
| 87 | SkDeviceProfile(float gammaExp, float contrastScale, LCDConfig, |
| 88 | FontHintLevel); |
| 89 | |
| 90 | float fGammaExponent; |
| 91 | float fContrastScale; |
| 92 | LCDConfig fLCDConfig; |
| 93 | FontHintLevel fFontHintLevel; |
robertphillips@google.com | 15e9d3e | 2012-06-21 20:25:03 +0000 | [diff] [blame] | 94 | |
| 95 | typedef SkRefCnt INHERITED; |
reed@google.com | 48a4cbc | 2012-03-01 19:21:11 +0000 | [diff] [blame] | 96 | }; |
| 97 | |
| 98 | #endif |