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      1 /*
      2  * Copyright 2010 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 GrGlyph_DEFINED
      9 #define GrGlyph_DEFINED
     10 
     11 #include "GrBatchAtlas.h"
     12 #include "GrRect.h"
     13 #include "GrTypes.h"
     14 
     15 #include "SkChecksum.h"
     16 #include "SkPath.h"
     17 
     18 class GrPlot;
     19 
     20 /*  Need this to be quad-state:
     21     - complete w/ image
     22     - just metrics
     23     - failed to get image, but has metrics
     24     - failed to get metrics
     25  */
     26 struct GrGlyph {
     27     enum MaskStyle {
     28         kCoverage_MaskStyle,
     29         kDistance_MaskStyle
     30     };
     31 
     32     typedef uint32_t PackedID;
     33 
     34     GrBatchAtlas::AtlasID fID;
     35     SkPath*               fPath;
     36     PackedID              fPackedID;
     37     GrMaskFormat          fMaskFormat;
     38     GrIRect16             fBounds;
     39     SkIPoint16            fAtlasLocation;
     40     bool                  fTooLargeForAtlas;
     41 
     42     void init(GrGlyph::PackedID packed, const SkIRect& bounds, GrMaskFormat format) {
     43         fID = GrBatchAtlas::kInvalidAtlasID;
     44         fPath = nullptr;
     45         fPackedID = packed;
     46         fBounds.set(bounds);
     47         fMaskFormat = format;
     48         fAtlasLocation.set(0, 0);
     49         fTooLargeForAtlas = GrBatchAtlas::GlyphTooLargeForAtlas(bounds.width(), bounds.height());
     50     }
     51 
     52     void free() {
     53         if (fPath) {
     54             delete fPath;
     55             fPath = nullptr;
     56         }
     57     }
     58 
     59     int width() const { return fBounds.width(); }
     60     int height() const { return fBounds.height(); }
     61     bool isEmpty() const { return fBounds.isEmpty(); }
     62     uint16_t glyphID() const { return UnpackID(fPackedID); }
     63 
     64     ///////////////////////////////////////////////////////////////////////////
     65 
     66     static inline unsigned ExtractSubPixelBitsFromFixed(SkFixed pos) {
     67         // two most significant fraction bits from fixed-point
     68         return (pos >> 14) & 3;
     69     }
     70 
     71     static inline PackedID Pack(uint16_t glyphID, SkFixed x, SkFixed y, MaskStyle ms) {
     72         x = ExtractSubPixelBitsFromFixed(x);
     73         y = ExtractSubPixelBitsFromFixed(y);
     74         int dfFlag = (ms == kDistance_MaskStyle) ? 0x1 : 0x0;
     75         return (dfFlag << 20) | (x << 18) | (y << 16) | glyphID;
     76     }
     77 
     78     static inline SkFixed UnpackFixedX(PackedID packed) {
     79         return ((packed >> 18) & 3) << 14;
     80     }
     81 
     82     static inline SkFixed UnpackFixedY(PackedID packed) {
     83         return ((packed >> 16) & 3) << 14;
     84     }
     85 
     86     static inline MaskStyle UnpackMaskStyle(PackedID packed) {
     87         return ((packed >> 20) & 1) ? kDistance_MaskStyle : kCoverage_MaskStyle;
     88     }
     89 
     90     static inline uint16_t UnpackID(PackedID packed) {
     91         return (uint16_t)packed;
     92     }
     93 
     94     static inline const GrGlyph::PackedID& GetKey(const GrGlyph& glyph) {
     95         return glyph.fPackedID;
     96     }
     97 
     98     static inline uint32_t Hash(GrGlyph::PackedID key) {
     99         return SkChecksum::Mix(key);
    100     }
    101 };
    102 
    103 #endif
    104