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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 "GrColorSpaceInfo.h"
#include "SkColorFilter.h"
#include "SkPaint.h"
#include "SkScalar.h"
#include "SkTLazy.h"
class GrAtlasGlyphCache;
class GrAtlasTextBlob;
class GrAtlasTextOp;
class GrAtlasTextStrike;
class GrClip;
class GrColorSpaceXform;
class GrContext;
class GrPaint;
class GrShaderCaps;
class SkColorSpace;
class SkDrawFilter;
class SkGlyph;
class SkMatrix;
struct SkIRect;
struct SkPoint;
class SkGlyphCache;
class SkTextBlobRunIterator;
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:
class Target {
public:
virtual ~Target() = default;
int width() const { return fWidth; }
int height() const { return fHeight; }
const GrColorSpaceInfo& colorSpaceInfo() const { return fColorSpaceInfo; }
virtual void addDrawOp(const GrClip&, std::unique_ptr<GrAtlasTextOp> op) = 0;
virtual void drawPath(const GrClip&, const SkPath&, const SkPaint&,
const SkMatrix& viewMatrix, const SkMatrix* pathMatrix,
const SkIRect& clipBounds) = 0;
virtual void makeGrPaint(GrMaskFormat, const SkPaint&, const SkMatrix& viewMatrix,
GrPaint*) = 0;
protected:
Target(int width, int height, const GrColorSpaceInfo& colorSpaceInfo)
: fWidth(width), fHeight(height), fColorSpaceInfo(colorSpaceInfo) {}
private:
int fWidth;
int fHeight;
const GrColorSpaceInfo& fColorSpaceInfo;
};
/**
* This is used to wrap a SkPaint and its post-color filter color. It is also used by RunPaint
* (below). This keeps a pointer to the SkPaint it is initialized with and expects it to remain
* const. It is also used to transform to GrPaint.
*/
class Paint {
public:
explicit Paint(const SkPaint* paint, const GrColorSpaceInfo* dstColorSpaceInfo)
: fPaint(paint), fDstColorSpaceInfo(dstColorSpaceInfo) {
this->initFilteredColor();
}
// These expose the paint's color run through its color filter (if any). This is only valid
// when drawing grayscale/lcd glyph masks and not when drawing color glyphs.
GrColor filteredPremulColor() const { return fFilteredPremulColor; }
SkColor luminanceColor() const { return fPaint->computeLuminanceColor(); }
const SkPaint& skPaint() const { return *fPaint; }
operator const SkPaint&() const { return this->skPaint(); }
// Just for RunPaint's constructor
const GrColorSpaceInfo* dstColorSpaceInfo() const { return fDstColorSpaceInfo; }
protected:
void initFilteredColor();
Paint() = default;
const SkPaint* fPaint;
const GrColorSpaceInfo* fDstColorSpaceInfo;
// This is the paint's color run through its color filter, if present. This color should
// be used except when rendering bitmap text, in which case the bitmap must be filtered in
// the fragment shader.
GrColor fFilteredPremulColor;
};
/**
* An extension of Paint that incorporated per-run modifications to the paint text settings and
* application of a draw filter. It expects its constructor arguments to remain alive and const
* during its lifetime.
*/
class RunPaint : public Paint {
public:
RunPaint(const Paint* paint, SkDrawFilter* filter, const SkSurfaceProps& props)
: fOriginalPaint(paint), fFilter(filter), fProps(props) {
// Initially we represent the original paint.
fPaint = &fOriginalPaint->skPaint();
fDstColorSpaceInfo = fOriginalPaint->dstColorSpaceInfo();
fFilteredPremulColor = fOriginalPaint->filteredPremulColor();
}
bool modifyForRun(const SkTextBlobRunIterator&);
private:
SkTLazy<SkPaint> fModifiedPaint;
const Paint* fOriginalPaint;
SkDrawFilter* fFilter;
const SkSurfaceProps& fProps;
};
static uint32_t FilterTextFlags(const SkSurfaceProps& surfaceProps, const SkPaint& paint);
static bool ShouldDisableLCD(const SkPaint& paint);
// Functions for drawing large text either as paths or (for color emoji) as scaled glyphs
static void DrawBigText(GrTextUtils::Target*, const GrClip& clip,
const SkPaint& paint, const SkMatrix& viewMatrix, const char text[],
size_t byteLength, SkScalar x, SkScalar y,
const SkIRect& clipBounds);
static void DrawBigPosText(GrTextUtils::Target*,
const SkSurfaceProps& props, const GrClip& clip,
const SkPaint& paint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength, const SkScalar pos[],
int scalarsPerPosition, const SkPoint& offset,
const SkIRect& clipBounds);
};
#endif
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