michael@0: #ifndef SkDeviceProperties_DEFINED
michael@0: #define SkDeviceProperties_DEFINED
michael@0: 
michael@0: #ifndef SK_GAMMA_EXPONENT
michael@0:     #define SK_GAMMA_EXPONENT (2.2f)
michael@0: #endif
michael@0: 
michael@0: #ifdef SK_GAMMA_SRGB
michael@0:     #undef SK_GAMMA_EXPONENT
michael@0:     #define SK_GAMMA_EXPONENT (0.0f)
michael@0: #endif
michael@0: 
michael@0: //TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and remove this import.
michael@0: #include "SkFontLCDConfig.h"
michael@0: 
michael@0: struct SkDeviceProperties {
michael@0:     struct Geometry {
michael@0:         /** The orientation of the pixel specifies the interpretation of the
michael@0:         *  layout. If the orientation is horizontal, the layout is interpreted as
michael@0:         *  left to right. It the orientation is vertical, the layout is
michael@0:         *  interpreted top to bottom (rotated 90deg cw from horizontal).
michael@0:         */
michael@0:         enum Orientation {
michael@0:             kUnknown_Orientation      = 0x0,
michael@0:             kKnown_Orientation        = 0x2,
michael@0: 
michael@0:             kHorizontal_Orientation   = 0x2,  //!< this is the default
michael@0:             kVertical_Orientation     = 0x3,
michael@0: 
michael@0:             kOrientationMask          = 0x3,
michael@0:         };
michael@0: 
michael@0:         /** The layout of the pixel specifies its subpixel geometry.
michael@0:         *
michael@0:         *  kUnknown_Layout means that the subpixel elements are not spatially
michael@0:         *  separated in any known or usable fashion.
michael@0:         */
michael@0:         enum Layout {
michael@0:             kUnknown_Layout   = 0x0,
michael@0:             kKnown_Layout     = 0x8,
michael@0: 
michael@0:             kRGB_Layout       = 0x8,  //!< this is the default
michael@0:             kBGR_Layout       = 0xC,
michael@0: 
michael@0:             kLayoutMask       = 0xC,
michael@0:         };
michael@0: 
michael@0:         Orientation getOrientation() {
michael@0:             return static_cast<Orientation>(fGeometry & kOrientationMask);
michael@0:         }
michael@0:         Layout getLayout() {
michael@0:             return static_cast<Layout>(fGeometry & kLayoutMask);
michael@0:         }
michael@0: 
michael@0:         bool isOrientationKnown() {
michael@0:             return SkToBool(fGeometry & kKnown_Orientation);
michael@0:         }
michael@0:         bool isLayoutKnown() {
michael@0:             return SkToBool(fGeometry & kKnown_Layout);
michael@0:         }
michael@0: 
michael@0:     private:
michael@0:         //TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and replace these calls with constants.
michael@0:         static Orientation fromOldOrientation(SkFontLCDConfig::LCDOrientation orientation) {
michael@0:             switch (orientation) {
michael@0:             case SkFontLCDConfig::kHorizontal_LCDOrientation: return kHorizontal_Orientation;
michael@0:             case SkFontLCDConfig::kVertical_LCDOrientation: return kVertical_Orientation;
michael@0:             default: return kUnknown_Orientation;
michael@0:             }
michael@0:         }
michael@0:         static Layout fromOldLayout(SkFontLCDConfig::LCDOrder order) {
michael@0:             switch (order) {
michael@0:             case SkFontLCDConfig::kRGB_LCDOrder: return kRGB_Layout;
michael@0:             case SkFontLCDConfig::kBGR_LCDOrder: return kBGR_Layout;
michael@0:             default: return kUnknown_Layout;
michael@0:             }
michael@0:         }
michael@0:     public:
michael@0:         static Geometry MakeDefault() {
michael@0:             Orientation orientation = fromOldOrientation(SkFontLCDConfig::GetSubpixelOrientation()); //kHorizontal_Orientation
michael@0:             Layout layout = fromOldLayout(SkFontLCDConfig::GetSubpixelOrder()); //kRGB_Layout
michael@0:             Geometry ret = { SkToU8(orientation | layout) };
michael@0:             return ret;
michael@0:         }
michael@0: 
michael@0:         static Geometry Make(Orientation orientation, Layout layout) {
michael@0:             Geometry ret = { SkToU8(orientation | layout) };
michael@0:             return ret;
michael@0:         }
michael@0: 
michael@0:         uint8_t fGeometry;
michael@0:     };
michael@0: 
michael@0:     static SkDeviceProperties MakeDefault() {
michael@0:         SkDeviceProperties ret = { Geometry::MakeDefault(), SK_GAMMA_EXPONENT };
michael@0:         return ret;
michael@0:     }
michael@0: 
michael@0:     static SkDeviceProperties Make(Geometry geometry, SkScalar gamma) {
michael@0:         SkDeviceProperties ret = { geometry, gamma };
michael@0:         return ret;
michael@0:     }
michael@0: 
michael@0:     /** Each pixel of an image will have some number of channels.
michael@0:      *  Can the layout of those channels be exploited? */
michael@0:     Geometry fGeometry;
michael@0: 
michael@0:     /** Represents the color space of the image. This is a woefully inadequate beginning. */
michael@0:     SkScalar fGamma;
michael@0: };
michael@0: 
michael@0: #endif