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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkSurfaceProps_DEFINED
      9 #define SkSurfaceProps_DEFINED
     10 
     11 #include "SkTypes.h"
     12 
     13 /**
     14  *  Description of how the LCD strips are arranged for each pixel. If this is unknown, or the
     15  *  pixels are meant to be "portable" and/or transformed before showing (e.g. rotated, scaled)
     16  *  then use kUnknown_SkPixelGeometry.
     17  */
     18 enum SkPixelGeometry {
     19     kUnknown_SkPixelGeometry,
     20     kRGB_H_SkPixelGeometry,
     21     kBGR_H_SkPixelGeometry,
     22     kRGB_V_SkPixelGeometry,
     23     kBGR_V_SkPixelGeometry,
     24 };
     25 
     26 // Returns true iff geo is a known geometry and is RGB.
     27 static inline bool SkPixelGeometryIsRGB(SkPixelGeometry geo) {
     28     return kRGB_H_SkPixelGeometry == geo || kRGB_V_SkPixelGeometry == geo;
     29 }
     30 
     31 // Returns true iff geo is a known geometry and is BGR.
     32 static inline bool SkPixelGeometryIsBGR(SkPixelGeometry geo) {
     33     return kBGR_H_SkPixelGeometry == geo || kBGR_V_SkPixelGeometry == geo;
     34 }
     35 
     36 // Returns true iff geo is a known geometry and is horizontal.
     37 static inline bool SkPixelGeometryIsH(SkPixelGeometry geo) {
     38     return kRGB_H_SkPixelGeometry == geo || kBGR_H_SkPixelGeometry == geo;
     39 }
     40 
     41 // Returns true iff geo is a known geometry and is vertical.
     42 static inline bool SkPixelGeometryIsV(SkPixelGeometry geo) {
     43     return kRGB_V_SkPixelGeometry == geo || kBGR_V_SkPixelGeometry == geo;
     44 }
     45 
     46 /**
     47  *  Describes properties and constraints of a given SkSurface. The rendering engine can parse these
     48  *  during drawing, and can sometimes optimize its performance (e.g. disabling an expensive
     49  *  feature).
     50  */
     51 class SkSurfaceProps {
     52 public:
     53     enum Flags {
     54         kDisallowAntiAlias_Flag     = 1 << 0,
     55         kDisallowDither_Flag        = 1 << 1,
     56         kUseDistanceFieldFonts_Flag = 1 << 2,
     57     };
     58     SkSurfaceProps(uint32_t flags, SkPixelGeometry);
     59 
     60     enum InitType {
     61         kLegacyFontHost_InitType
     62     };
     63     SkSurfaceProps(InitType);
     64     SkSurfaceProps(uint32_t flags, InitType);
     65 
     66     uint32_t flags() const { return fFlags; }
     67     SkPixelGeometry pixelGeometry() const { return fPixelGeometry; }
     68 
     69     bool isDisallowAA() const { return SkToBool(fFlags & kDisallowAntiAlias_Flag); }
     70     bool isDisallowDither() const { return SkToBool(fFlags & kDisallowDither_Flag); }
     71     bool isUseDistanceFieldFonts() const { return SkToBool(fFlags & kUseDistanceFieldFonts_Flag); }
     72 
     73 private:
     74     SkSurfaceProps();
     75 
     76     uint32_t        fFlags;
     77     SkPixelGeometry fPixelGeometry;
     78 };
     79 
     80 #endif
     81