4770a3b7a2
This makes it a compile error to specify both SK_GAMMA_EXPONENT and SK_GAMMA_SRGB. It also ensures that SK_GAMMA_EXPONENT will be set consistently. R=djsollen@google.com, reed@google.com Review URL: https://codereview.chromium.org/233003003 git-svn-id: http://skia.googlecode.com/svn/trunk@14143 2bbb7eff-a529-9590-31e7-b0007b416f81
104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
#ifndef SkDeviceProperties_DEFINED
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#define SkDeviceProperties_DEFINED
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//TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and remove this import.
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#include "SkFontLCDConfig.h"
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struct SkDeviceProperties {
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struct Geometry {
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/** The orientation of the pixel specifies the interpretation of the
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* layout. If the orientation is horizontal, the layout is interpreted as
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* left to right. It the orientation is vertical, the layout is
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* interpreted top to bottom (rotated 90deg cw from horizontal).
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*/
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enum Orientation {
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kUnknown_Orientation = 0x0,
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kKnown_Orientation = 0x2,
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kHorizontal_Orientation = 0x2, //!< this is the default
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kVertical_Orientation = 0x3,
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kOrientationMask = 0x3,
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};
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/** The layout of the pixel specifies its subpixel geometry.
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*
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* kUnknown_Layout means that the subpixel elements are not spatially
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* separated in any known or usable fashion.
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*/
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enum Layout {
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kUnknown_Layout = 0x0,
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kKnown_Layout = 0x8,
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kRGB_Layout = 0x8, //!< this is the default
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kBGR_Layout = 0xC,
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kLayoutMask = 0xC,
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};
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Orientation getOrientation() {
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return static_cast<Orientation>(fGeometry & kOrientationMask);
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}
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Layout getLayout() {
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return static_cast<Layout>(fGeometry & kLayoutMask);
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}
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bool isOrientationKnown() {
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return SkToBool(fGeometry & kKnown_Orientation);
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}
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bool isLayoutKnown() {
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return SkToBool(fGeometry & kKnown_Layout);
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}
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private:
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//TODO: get everyone to stop using SkFontLCDConfig::SetSubpixel* and replace these calls with constants.
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static Orientation fromOldOrientation(SkFontLCDConfig::LCDOrientation orientation) {
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switch (orientation) {
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case SkFontLCDConfig::kHorizontal_LCDOrientation: return kHorizontal_Orientation;
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case SkFontLCDConfig::kVertical_LCDOrientation: return kVertical_Orientation;
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default: return kUnknown_Orientation;
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}
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}
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static Layout fromOldLayout(SkFontLCDConfig::LCDOrder order) {
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switch (order) {
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case SkFontLCDConfig::kRGB_LCDOrder: return kRGB_Layout;
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case SkFontLCDConfig::kBGR_LCDOrder: return kBGR_Layout;
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default: return kUnknown_Layout;
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}
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}
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public:
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static Geometry MakeDefault() {
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Orientation orientation = fromOldOrientation(SkFontLCDConfig::GetSubpixelOrientation()); //kHorizontal_Orientation
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Layout layout = fromOldLayout(SkFontLCDConfig::GetSubpixelOrder()); //kRGB_Layout
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Geometry ret = { SkToU8(orientation | layout) };
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return ret;
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}
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static Geometry Make(Orientation orientation, Layout layout) {
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Geometry ret = { SkToU8(orientation | layout) };
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return ret;
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}
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uint8_t fGeometry;
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};
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static SkDeviceProperties MakeDefault() {
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SkDeviceProperties ret = { Geometry::MakeDefault(), SK_GAMMA_EXPONENT };
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return ret;
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}
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static SkDeviceProperties Make(Geometry geometry, SkScalar gamma) {
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SkDeviceProperties ret = { geometry, gamma };
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return ret;
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}
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/** Each pixel of an image will have some number of channels.
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* Can the layout of those channels be exploited? */
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Geometry fGeometry;
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/** Represents the color space of the image. This is a woefully inadequate beginning. */
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SkScalar fGamma;
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};
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#endif
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