1 files changed, 112 insertions, 0 deletions
diff --git a/include/core/SkDeviceProperties.h b/include/core/SkDeviceProperties.h
new file mode 100644
index 0000000000..fcab9ad5c8
--- /dev/null
+++ b/include/core/SkDeviceProperties.h
@@ -0,0 +1,112 @@
+#ifndef SkDeviceProperties_DEFINED
+#define SkDeviceProperties_DEFINED
+
+#ifndef SK_GAMMA_EXPONENT
+    #define SK_GAMMA_EXPONENT (2.2f)
+#endif
+
+#ifdef SK_GAMMA_SRGB
+    #undef SK_GAMMA_EXPONENT
+    #define SK_GAMMA_EXPONENT (0.0f)
+#endif
+
+//TODO: get everyone to stop using SkFontHost::SetSubpixel* and remove this import.
+#include "SkFontHost.h"
+
+struct SkDeviceProperties {
+    struct Geometry {
+        /** The orientation of the pixel specifies the interpretation of the
+        *  layout. If the orientation is horizontal, the layout is interpreted as
+        *  left to right. It the orientation is vertical, the layout is
+        *  interpreted top to bottom (rotated 90deg cw from horizontal).
+        */
+        enum Orientation {
+            kUnknown_Orientation      = 0x0,
+            kKnown_Orientation        = 0x2,
+
+            kHorizontal_Orientation   = 0x2,  //!< this is the default
+            kVertical_Orientation     = 0x3,
+
+            kOrientationMask          = 0x3,
+        };
+
+        /** The layout of the pixel specifies its subpixel geometry.
+        *
+        *  kUnknown_Layout means that the subpixel elements are not spatially
+        *  separated in any known or usable fashion.
+        */
+        enum Layout {
+            kUnknown_Layout   = 0x0,
+            kKnown_Layout     = 0x8,
+
+            kRGB_Layout       = 0x8,  //!< this is the default
+            kBGR_Layout       = 0xC,
+
+            kLayoutMask       = 0xC,
+        };
+
+        Orientation getOrientation() {
+            return static_cast<Orientation>(fGeometry | kOrientationMask);
+        }
+        Layout getLayout() {
+            return static_cast<Layout>(fGeometry | kLayoutMask);
+        }
+
+        bool isOrientationKnown() {
+            return fGeometry & kKnown_Orientation;
+        }
+        bool isLayoutKnown() {
+            return fGeometry & kKnown_Layout;
+        }
+
+    private:
+        //TODO: get everyone to stop using SkFontHost::SetSubpixel* and replace these calls with constants.
+        static Orientation fromOldOrientation(SkFontHost::LCDOrientation orientation) {
+            switch (orientation) {
+            case SkFontHost::kHorizontal_LCDOrientation: return kHorizontal_Orientation;
+            case SkFontHost::kVertical_LCDOrientation: return kVertical_Orientation;
+            default: return kUnknown_Orientation;
+            }
+        }
+        static Layout fromOldLayout(SkFontHost::LCDOrder order) {
+            switch (order) {
+            case SkFontHost::kRGB_LCDOrder: return kRGB_Layout;
+            case SkFontHost::kBGR_LCDOrder: return kBGR_Layout;
+            default: return kUnknown_Layout;
+            }
+        }
+    public:
+        static Geometry MakeDefault() {
+            Orientation orientation = fromOldOrientation(SkFontHost::GetSubpixelOrientation()); //kHorizontal_Orientation
+            Layout layout = fromOldLayout(SkFontHost::GetSubpixelOrder()); //kRGB_Layout
+            Geometry ret = { orientation | layout };
+            return ret;
+        }
+
+        static Geometry Make(Orientation orientation, Layout layout) {
+            Geometry ret = { orientation | layout };
+            return ret;
+        }
+
+        uint8_t fGeometry;
+    };
+
+    static SkDeviceProperties MakeDefault() {
+        SkDeviceProperties ret = { Geometry::MakeDefault(), SK_GAMMA_EXPONENT };
+        return ret;
+    }
+
+    static SkDeviceProperties Make(Geometry geometry, SkScalar gamma) {
+        SkDeviceProperties ret = { geometry, gamma };
+        return ret;
+    }
+
+    /** Each pixel of an image will have some number of channels.
+     *  Can the layout of those channels be exploited? */
+    Geometry fGeometry;
+
+    /** Represents the color space of the image. This is a woefully inadequate beginning. */
+    SkScalar fGamma;
+};
+
+#endif