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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 GrAtlasTextContext_DEFINED
#define GrAtlasTextContext_DEFINED
#include "GrAtlasTextBlob.h"
#include "GrDistanceFieldAdjustTable.h"
#include "GrGeometryProcessor.h"
#include "GrTextUtils.h"
#include "SkTextBlobRunIterator.h"
#if GR_TEST_UTILS
#include "GrDrawOpTest.h"
#endif
class GrDrawOp;
class GrTextBlobCache;
class SkGlyph;
/*
* Renders text using some kind of an atlas, ie BitmapText or DistanceField text
*/
class GrAtlasTextContext {
public:
struct Options {
/**
* Below this size (in device space) distance field text will not be used. Negative means
* use a default value.
*/
SkScalar fMinDistanceFieldFontSize = -1.f;
/**
* Above this size (in device space) distance field text will not be used and glyphs will
* be rendered from outline as individual paths. Negative means use a default value.
*/
SkScalar fMaxDistanceFieldFontSize = -1.f;
};
static std::unique_ptr<GrAtlasTextContext> Make(const Options& options);
bool canDraw(const SkPaint&, const SkMatrix& viewMatrix, const SkSurfaceProps&,
const GrShaderCaps&);
void drawText(GrContext*, GrTextUtils::Target*, const GrClip&, const SkPaint&,
const SkMatrix& viewMatrix, const SkSurfaceProps&, const char text[],
size_t byteLength, SkScalar x, SkScalar y, const SkIRect& regionClipBounds);
void drawPosText(GrContext*, GrTextUtils::Target*, const GrClip&, const SkPaint&,
const SkMatrix& viewMatrix, const SkSurfaceProps&, const char text[],
size_t byteLength, const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset, const SkIRect& regionClipBounds);
void drawTextBlob(GrContext*, GrTextUtils::Target*, const GrClip&, const SkPaint&,
const SkMatrix& viewMatrix, const SkSurfaceProps&, const SkTextBlob*,
SkScalar x, SkScalar y, SkDrawFilter*, const SkIRect& clipBounds);
private:
GrAtlasTextContext(const Options& options);
// sets up the descriptor on the blob and returns a detached cache. Client must attach
inline static SkColor ComputeCanonicalColor(const SkPaint&, bool lcd);
// Determines if we need to use fake gamma (and contrast boost):
inline static uint32_t ComputeScalerContextFlags(const GrColorSpaceInfo&);
void regenerateTextBlob(GrAtlasTextBlob* bmp,
GrAtlasGlyphCache*,
const GrShaderCaps&,
const GrTextUtils::Paint&,
uint32_t scalerContextFlags,
const SkMatrix& viewMatrix,
const SkSurfaceProps&,
const SkTextBlob* blob, SkScalar x, SkScalar y,
SkDrawFilter* drawFilter) const;
inline static bool HasLCD(const SkTextBlob*);
inline sk_sp<GrAtlasTextBlob> makeDrawTextBlob(GrTextBlobCache*, GrAtlasGlyphCache*,
const GrShaderCaps&,
const GrTextUtils::Paint&,
uint32_t scalerContextFlags,
const SkMatrix& viewMatrix,
const SkSurfaceProps&,
const char text[], size_t byteLength,
SkScalar x, SkScalar y) const;
inline sk_sp<GrAtlasTextBlob> makeDrawPosTextBlob(GrTextBlobCache*, GrAtlasGlyphCache*,
const GrShaderCaps&,
const GrTextUtils::Paint&,
uint32_t scalerContextFlags,
const SkMatrix& viewMatrix,
const SkSurfaceProps&,
const char text[], size_t byteLength,
const SkScalar pos[],
int scalarsPerPosition,
const SkPoint& offset) const;
// Functions for appending BMP text to GrAtlasTextBlob
static void DrawBmpText(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*,
const SkSurfaceProps&, const GrTextUtils::Paint& paint,
uint32_t scalerContextFlags, const SkMatrix& viewMatrix,
const char text[], size_t byteLength, SkScalar x, SkScalar y);
static void DrawBmpPosText(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*,
const SkSurfaceProps&, const GrTextUtils::Paint& paint,
uint32_t scalerContextFlags, const SkMatrix& viewMatrix,
const char text[], size_t byteLength, const SkScalar pos[],
int scalarsPerPosition, const SkPoint& offset);
// functions for appending distance field text
bool canDrawAsDistanceFields(const SkPaint& skPaint, const SkMatrix& viewMatrix,
const SkSurfaceProps& props, const GrShaderCaps& caps) const;
void drawDFText(GrAtlasTextBlob* blob, int runIndex, GrAtlasGlyphCache*, const SkSurfaceProps&,
const GrTextUtils::Paint& paint, uint32_t scalerContextFlags,
const SkMatrix& viewMatrix, const char text[], size_t byteLength, SkScalar x,
SkScalar y) const;
void drawDFPosText(GrAtlasTextBlob* blob, int runIndex, GrAtlasGlyphCache*,
const SkSurfaceProps&, const GrTextUtils::Paint& paint,
uint32_t scalerContextFlags, const SkMatrix& viewMatrix, const char text[],
size_t byteLength, const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset) const;
void initDistanceFieldPaint(GrAtlasTextBlob* blob,
SkPaint* skPaint,
SkScalar* textRatio,
const SkMatrix& viewMatrix) const;
static void BmpAppendGlyph(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*,
GrAtlasTextStrike**, const SkGlyph&, int left, int top,
GrColor color, SkGlyphCache*);
static bool DfAppendGlyph(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*,
GrAtlasTextStrike**, const SkGlyph&, SkScalar sx, SkScalar sy,
GrColor color, SkGlyphCache* cache, SkScalar textRatio,
const SkMatrix& viewMatrix);
const GrDistanceFieldAdjustTable* dfAdjustTable() const { return fDistanceAdjustTable.get(); }
sk_sp<const GrDistanceFieldAdjustTable> fDistanceAdjustTable;
SkScalar fMinDistanceFieldFontSize;
SkScalar fMaxDistanceFieldFontSize;
#if GR_TEST_UTILS
static const uint32_t kTextBlobOpScalerContextFlags =
SkPaint::kFakeGammaAndBoostContrast_ScalerContextFlags;
GR_DRAW_OP_TEST_FRIEND(GrAtlasTextOp);
#endif
};
#endif
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