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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGlyph_DEFINED
#define GrGlyph_DEFINED
#include "GrDrawOpAtlas.h"
#include "GrRect.h"
#include "GrTypes.h"
#include "SkChecksum.h"
#include "SkFixed.h"
#include "SkPath.h"
/* Need this to be quad-state:
- complete w/ image
- just metrics
- failed to get image, but has metrics
- failed to get metrics
*/
struct GrGlyph {
enum MaskStyle {
kCoverage_MaskStyle,
kDistance_MaskStyle
};
typedef uint32_t PackedID;
GrDrawOpAtlas::AtlasID fID;
SkPath* fPath;
PackedID fPackedID;
GrMaskFormat fMaskFormat;
GrIRect16 fBounds;
SkIPoint16 fAtlasLocation;
bool fTooLargeForAtlas;
void init(GrGlyph::PackedID packed, const SkIRect& bounds, GrMaskFormat format) {
fID = GrDrawOpAtlas::kInvalidAtlasID;
fPath = nullptr;
fPackedID = packed;
fBounds.set(bounds);
fMaskFormat = format;
fAtlasLocation.set(0, 0);
fTooLargeForAtlas = GrDrawOpAtlas::GlyphTooLargeForAtlas(bounds.width(), bounds.height());
}
void reset() {
if (fPath) {
delete fPath;
fPath = nullptr;
}
}
int width() const { return fBounds.width(); }
int height() const { return fBounds.height(); }
bool isEmpty() const { return fBounds.isEmpty(); }
uint16_t glyphID() const { return UnpackID(fPackedID); }
uint32_t pageIndex() const { return GrDrawOpAtlas::GetPageIndexFromID(fID); }
///////////////////////////////////////////////////////////////////////////
static inline unsigned ExtractSubPixelBitsFromFixed(SkFixed pos) {
// two most significant fraction bits from fixed-point
return (pos >> 14) & 3;
}
static inline PackedID Pack(uint16_t glyphID, SkFixed x, SkFixed y, MaskStyle ms) {
x = ExtractSubPixelBitsFromFixed(x);
y = ExtractSubPixelBitsFromFixed(y);
int dfFlag = (ms == kDistance_MaskStyle) ? 0x1 : 0x0;
return (dfFlag << 20) | (x << 18) | (y << 16) | glyphID;
}
static inline SkFixed UnpackFixedX(PackedID packed) {
return ((packed >> 18) & 3) << 14;
}
static inline SkFixed UnpackFixedY(PackedID packed) {
return ((packed >> 16) & 3) << 14;
}
static inline MaskStyle UnpackMaskStyle(PackedID packed) {
return ((packed >> 20) & 1) ? kDistance_MaskStyle : kCoverage_MaskStyle;
}
static inline uint16_t UnpackID(PackedID packed) {
return (uint16_t)packed;
}
static inline const GrGlyph::PackedID& GetKey(const GrGlyph& glyph) {
return glyph.fPackedID;
}
static inline uint32_t Hash(GrGlyph::PackedID key) {
return SkChecksum::Mix(key);
}
};
#endif
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