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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrTextUtils_DEFINED
#define GrTextUtils_DEFINED
#include "GrColor.h"
#include "SkPaint.h"
#include "SkScalar.h"
class GrAtlasTextBlob;
class GrBatchFontCache;
class GrBatchTextStrike;
class GrClip;
class GrContext;
class GrDrawContext;
class GrFontScaler;
class GrShaderCaps;
class SkGlyph;
class SkMatrix;
struct SkIRect;
struct SkPoint;
class SkGlyphCache;
class SkSurfaceProps;
/*
* A class to house a bunch of common text utilities. This class should *ONLY* have static
* functions. It is not a namespace only because we wish to friend SkPaint
*
*/
class GrTextUtils {
public:
// Functions for appending BMP text to GrAtlasTextBlob
static void DrawBmpText(GrAtlasTextBlob*, int runIndex,
GrBatchFontCache*, const SkSurfaceProps&,
const SkPaint&,
GrColor, SkPaint::FakeGamma, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y);
static void DrawBmpPosText(GrAtlasTextBlob*, int runIndex,
GrBatchFontCache*, const SkSurfaceProps&, const SkPaint&,
GrColor, SkPaint::FakeGamma, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset);
// functions for appending distance field text
static bool CanDrawAsDistanceFields(const SkPaint& skPaint, const SkMatrix& viewMatrix,
const SkSurfaceProps& props, const GrShaderCaps& caps);
static void DrawDFText(GrAtlasTextBlob* blob, int runIndex,
GrBatchFontCache*, const SkSurfaceProps&,
const SkPaint& skPaint, GrColor color, SkPaint::FakeGamma,
const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y);
static void DrawDFPosText(GrAtlasTextBlob* blob, int runIndex,
GrBatchFontCache*, const SkSurfaceProps&, const SkPaint&,
GrColor color, SkPaint::FakeGamma, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset);
// Functions for drawing text as paths
static void DrawTextAsPath(GrContext*, GrDrawContext*, const GrClip& clip,
const SkPaint& origPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength, SkScalar x, SkScalar y,
const SkIRect& clipBounds);
static void DrawPosTextAsPath(GrContext* context,
GrDrawContext* dc,
const SkSurfaceProps& props,
const GrClip& clip,
const SkPaint& origPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset, const SkIRect& clipBounds);
static bool ShouldDisableLCD(const SkPaint& paint);
static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache);
static uint32_t FilterTextFlags(const SkSurfaceProps& surfaceProps, const SkPaint& paint);
private:
static void InitDistanceFieldPaint(GrAtlasTextBlob* blob,
SkPaint* skPaint,
SkScalar* textRatio,
const SkMatrix& viewMatrix);
static void BmpAppendGlyph(GrAtlasTextBlob*, int runIndex, GrBatchFontCache*,
GrBatchTextStrike**, const SkGlyph&, int left, int top,
GrColor color, GrFontScaler*);
static bool DfAppendGlyph(GrAtlasTextBlob*, int runIndex, GrBatchFontCache*,
GrBatchTextStrike**, const SkGlyph&,
SkScalar sx, SkScalar sy, GrColor color,
GrFontScaler* scaler,
SkScalar textRatio, const SkMatrix& viewMatrix);
};
#endif
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