1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/core/SkDeviceProperties.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,112 @@
1.4 +#ifndef SkDeviceProperties_DEFINED
1.5 +#define SkDeviceProperties_DEFINED
1.6 +
1.7 +#ifndef SK_GAMMA_EXPONENT
1.8 + #define SK_GAMMA_EXPONENT (2.2f)
1.9 +#endif
1.10 +
1.11 +#ifdef SK_GAMMA_SRGB
1.12 + #undef SK_GAMMA_EXPONENT
1.13 + #define SK_GAMMA_EXPONENT (0.0f)
1.14 +#endif
1.15 +
1.16 +//TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and remove this import.
1.17 +#include "SkFontLCDConfig.h"
1.18 +
1.19 +struct SkDeviceProperties {
1.20 + struct Geometry {
1.21 + /** The orientation of the pixel specifies the interpretation of the
1.22 + * layout. If the orientation is horizontal, the layout is interpreted as
1.23 + * left to right. It the orientation is vertical, the layout is
1.24 + * interpreted top to bottom (rotated 90deg cw from horizontal).
1.25 + */
1.26 + enum Orientation {
1.27 + kUnknown_Orientation = 0x0,
1.28 + kKnown_Orientation = 0x2,
1.29 +
1.30 + kHorizontal_Orientation = 0x2, //!< this is the default
1.31 + kVertical_Orientation = 0x3,
1.32 +
1.33 + kOrientationMask = 0x3,
1.34 + };
1.35 +
1.36 + /** The layout of the pixel specifies its subpixel geometry.
1.37 + *
1.38 + * kUnknown_Layout means that the subpixel elements are not spatially
1.39 + * separated in any known or usable fashion.
1.40 + */
1.41 + enum Layout {
1.42 + kUnknown_Layout = 0x0,
1.43 + kKnown_Layout = 0x8,
1.44 +
1.45 + kRGB_Layout = 0x8, //!< this is the default
1.46 + kBGR_Layout = 0xC,
1.47 +
1.48 + kLayoutMask = 0xC,
1.49 + };
1.50 +
1.51 + Orientation getOrientation() {
1.52 + return static_cast<Orientation>(fGeometry & kOrientationMask);
1.53 + }
1.54 + Layout getLayout() {
1.55 + return static_cast<Layout>(fGeometry & kLayoutMask);
1.56 + }
1.57 +
1.58 + bool isOrientationKnown() {
1.59 + return SkToBool(fGeometry & kKnown_Orientation);
1.60 + }
1.61 + bool isLayoutKnown() {
1.62 + return SkToBool(fGeometry & kKnown_Layout);
1.63 + }
1.64 +
1.65 + private:
1.66 + //TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and replace these calls with constants.
1.67 + static Orientation fromOldOrientation(SkFontLCDConfig::LCDOrientation orientation) {
1.68 + switch (orientation) {
1.69 + case SkFontLCDConfig::kHorizontal_LCDOrientation: return kHorizontal_Orientation;
1.70 + case SkFontLCDConfig::kVertical_LCDOrientation: return kVertical_Orientation;
1.71 + default: return kUnknown_Orientation;
1.72 + }
1.73 + }
1.74 + static Layout fromOldLayout(SkFontLCDConfig::LCDOrder order) {
1.75 + switch (order) {
1.76 + case SkFontLCDConfig::kRGB_LCDOrder: return kRGB_Layout;
1.77 + case SkFontLCDConfig::kBGR_LCDOrder: return kBGR_Layout;
1.78 + default: return kUnknown_Layout;
1.79 + }
1.80 + }
1.81 + public:
1.82 + static Geometry MakeDefault() {
1.83 + Orientation orientation = fromOldOrientation(SkFontLCDConfig::GetSubpixelOrientation()); //kHorizontal_Orientation
1.84 + Layout layout = fromOldLayout(SkFontLCDConfig::GetSubpixelOrder()); //kRGB_Layout
1.85 + Geometry ret = { SkToU8(orientation | layout) };
1.86 + return ret;
1.87 + }
1.88 +
1.89 + static Geometry Make(Orientation orientation, Layout layout) {
1.90 + Geometry ret = { SkToU8(orientation | layout) };
1.91 + return ret;
1.92 + }
1.93 +
1.94 + uint8_t fGeometry;
1.95 + };
1.96 +
1.97 + static SkDeviceProperties MakeDefault() {
1.98 + SkDeviceProperties ret = { Geometry::MakeDefault(), SK_GAMMA_EXPONENT };
1.99 + return ret;
1.100 + }
1.101 +
1.102 + static SkDeviceProperties Make(Geometry geometry, SkScalar gamma) {
1.103 + SkDeviceProperties ret = { geometry, gamma };
1.104 + return ret;
1.105 + }
1.106 +
1.107 + /** Each pixel of an image will have some number of channels.
1.108 + * Can the layout of those channels be exploited? */
1.109 + Geometry fGeometry;
1.110 +
1.111 + /** Represents the color space of the image. This is a woefully inadequate beginning. */
1.112 + SkScalar fGamma;
1.113 +};
1.114 +
1.115 +#endif
