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comparison: gfx/skia/trunk/include/core/SkDeviceProperties.h
gfx/skia/trunk/include/core/SkDeviceProperties.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:aacb3adf15bf |
|---|---|
| 1 #ifndef SkDeviceProperties_DEFINED | |
| 2 #define SkDeviceProperties_DEFINED | |
| 3 | |
| 4 #ifndef SK_GAMMA_EXPONENT | |
| 5 #define SK_GAMMA_EXPONENT (2.2f) | |
| 6 #endif | |
| 7 | |
| 8 #ifdef SK_GAMMA_SRGB | |
| 9 #undef SK_GAMMA_EXPONENT | |
| 10 #define SK_GAMMA_EXPONENT (0.0f) | |
| 11 #endif | |
| 12 | |
| 13 //TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and remove this import. | |
| 14 #include "SkFontLCDConfig.h" | |
| 15 | |
| 16 struct SkDeviceProperties { | |
| 17 struct Geometry { | |
| 18 /** The orientation of the pixel specifies the interpretation of the | |
| 19 * layout. If the orientation is horizontal, the layout is interpreted as | |
| 20 * left to right. It the orientation is vertical, the layout is | |
| 21 * interpreted top to bottom (rotated 90deg cw from horizontal). | |
| 22 */ | |
| 23 enum Orientation { | |
| 24 kUnknown_Orientation = 0x0, | |
| 25 kKnown_Orientation = 0x2, | |
| 26 | |
| 27 kHorizontal_Orientation = 0x2, //!< this is the default | |
| 28 kVertical_Orientation = 0x3, | |
| 29 | |
| 30 kOrientationMask = 0x3, | |
| 31 }; | |
| 32 | |
| 33 /** The layout of the pixel specifies its subpixel geometry. | |
| 34 * | |
| 35 * kUnknown_Layout means that the subpixel elements are not spatially | |
| 36 * separated in any known or usable fashion. | |
| 37 */ | |
| 38 enum Layout { | |
| 39 kUnknown_Layout = 0x0, | |
| 40 kKnown_Layout = 0x8, | |
| 41 | |
| 42 kRGB_Layout = 0x8, //!< this is the default | |
| 43 kBGR_Layout = 0xC, | |
| 44 | |
| 45 kLayoutMask = 0xC, | |
| 46 }; | |
| 47 | |
| 48 Orientation getOrientation() { | |
| 49 return static_cast<Orientation>(fGeometry & kOrientationMask); | |
| 50 } | |
| 51 Layout getLayout() { | |
| 52 return static_cast<Layout>(fGeometry & kLayoutMask); | |
| 53 } | |
| 54 | |
| 55 bool isOrientationKnown() { | |
| 56 return SkToBool(fGeometry & kKnown_Orientation); | |
| 57 } | |
| 58 bool isLayoutKnown() { | |
| 59 return SkToBool(fGeometry & kKnown_Layout); | |
| 60 } | |
| 61 | |
| 62 private: | |
| 63 //TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and replace these calls with constants. | |
| 64 static Orientation fromOldOrientation(SkFontLCDConfig::LCDOrientation orientation) { | |
| 65 switch (orientation) { | |
| 66 case SkFontLCDConfig::kHorizontal_LCDOrientation: return kHorizontal_Orientation; | |
| 67 case SkFontLCDConfig::kVertical_LCDOrientation: return kVertical_Orientation; | |
| 68 default: return kUnknown_Orientation; | |
| 69 } | |
| 70 } | |
| 71 static Layout fromOldLayout(SkFontLCDConfig::LCDOrder order) { | |
| 72 switch (order) { | |
| 73 case SkFontLCDConfig::kRGB_LCDOrder: return kRGB_Layout; | |
| 74 case SkFontLCDConfig::kBGR_LCDOrder: return kBGR_Layout; | |
| 75 default: return kUnknown_Layout; | |
| 76 } | |
| 77 } | |
| 78 public: | |
| 79 static Geometry MakeDefault() { | |
| 80 Orientation orientation = fromOldOrientation(SkFontLCDConfig::GetSubpixelOrientation()); //kHorizontal_Orientation | |
| 81 Layout layout = fromOldLayout(SkFontLCDConfig::GetSubpixelOrder()); //kRGB_Layout | |
| 82 Geometry ret = { SkToU8(orientation | layout) }; | |
| 83 return ret; | |
| 84 } | |
| 85 | |
| 86 static Geometry Make(Orientation orientation, Layout layout) { | |
| 87 Geometry ret = { SkToU8(orientation | layout) }; | |
| 88 return ret; | |
| 89 } | |
| 90 | |
| 91 uint8_t fGeometry; | |
| 92 }; | |
| 93 | |
| 94 static SkDeviceProperties MakeDefault() { | |
| 95 SkDeviceProperties ret = { Geometry::MakeDefault(), SK_GAMMA_EXPONENT }; | |
| 96 return ret; | |
| 97 } | |
| 98 | |
| 99 static SkDeviceProperties Make(Geometry geometry, SkScalar gamma) { | |
| 100 SkDeviceProperties ret = { geometry, gamma }; | |
| 101 return ret; | |
| 102 } | |
| 103 | |
| 104 /** Each pixel of an image will have some number of channels. | |
| 105 * Can the layout of those channels be exploited? */ | |
| 106 Geometry fGeometry; | |
| 107 | |
| 108 /** Represents the color space of the image. This is a woefully inadequate beginning. */ | |
| 109 SkScalar fGamma; | |
| 110 }; | |
| 111 | |
| 112 #endif |
