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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkGradientShaderPriv_DEFINED
#define SkGradientShaderPriv_DEFINED
#include "SkGradientShader.h"
#include "SkClampRange.h"
#include "SkColorPriv.h"
#include "SkMallocPixelRef.h"
#include "SkUnitMapper.h"
#include "SkUtils.h"
#include "SkTemplates.h"
#include "SkBitmapCache.h"
#include "SkShader.h"
#ifndef SK_DISABLE_DITHER_32BIT_GRADIENT
#define USE_DITHER_32BIT_GRADIENT
#endif
static void sk_memset32_dither(uint32_t dst[], uint32_t v0, uint32_t v1,
int count) {
if (count > 0) {
if (v0 == v1) {
sk_memset32(dst, v0, count);
} else {
int pairs = count >> 1;
for (int i = 0; i < pairs; i++) {
*dst++ = v0;
*dst++ = v1;
}
if (count & 1) {
*dst = v0;
}
}
}
}
// Clamp
static SkFixed clamp_tileproc(SkFixed x) {
return SkClampMax(x, 0xFFFF);
}
// Repeat
static SkFixed repeat_tileproc(SkFixed x) {
return x & 0xFFFF;
}
// Mirror
// Visual Studio 2010 (MSC_VER=1600) optimizes bit-shift code incorrectly.
// See http://code.google.com/p/skia/issues/detail?id=472
#if defined(_MSC_VER) && (_MSC_VER >= 1600)
#pragma optimize("", off)
#endif
static inline SkFixed mirror_tileproc(SkFixed x) {
int s = x << 15 >> 31;
return (x ^ s) & 0xFFFF;
}
#if defined(_MSC_VER) && (_MSC_VER >= 1600)
#pragma optimize("", on)
#endif
///////////////////////////////////////////////////////////////////////////////
typedef SkFixed (*TileProc)(SkFixed);
///////////////////////////////////////////////////////////////////////////////
static const TileProc gTileProcs[] = {
clamp_tileproc,
repeat_tileproc,
mirror_tileproc
};
///////////////////////////////////////////////////////////////////////////////
class SkGradientShaderBase : public SkShader {
public:
SkGradientShaderBase(const SkColor colors[], const SkScalar pos[],
int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper);
virtual ~SkGradientShaderBase();
// overrides
virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&) SK_OVERRIDE;
virtual uint32_t getFlags() SK_OVERRIDE { return fFlags; }
virtual bool isOpaque() const SK_OVERRIDE;
void getGradientTableBitmap(SkBitmap*) const;
enum {
/// Seems like enough for visual accuracy. TODO: if pos[] deserves
/// it, use a larger cache.
kCache16Bits = 8,
kGradient16Length = (1 << kCache16Bits),
/// Each cache gets 1 extra entry at the end so we don't have to
/// test for end-of-cache in lerps. This is also the value used
/// to stride *writes* into the dither cache; it must not be zero.
/// Total space for a cache is 2x kCache16Count entries: one
/// regular cache, one for dithering.
kCache16Count = kGradient16Length + 1,
kCache16Shift = 16 - kCache16Bits,
kSqrt16Shift = 8 - kCache16Bits,
/// Seems like enough for visual accuracy. TODO: if pos[] deserves
/// it, use a larger cache.
kCache32Bits = 8,
kGradient32Length = (1 << kCache32Bits),
/// Each cache gets 1 extra entry at the end so we don't have to
/// test for end-of-cache in lerps. This is also the value used
/// to stride *writes* into the dither cache; it must not be zero.
/// Total space for a cache is 2x kCache32Count entries: one
/// regular cache, one for dithering.
kCache32Count = kGradient32Length + 1,
kCache32Shift = 16 - kCache32Bits,
kSqrt32Shift = 8 - kCache32Bits,
/// This value is used to *read* the dither cache; it may be 0
/// if dithering is disabled.
#ifdef USE_DITHER_32BIT_GRADIENT
kDitherStride32 = kCache32Count,
#else
kDitherStride32 = 0,
#endif
kDitherStride16 = kCache16Count,
kLerpRemainderMask32 = (1 << (16 - kCache32Bits)) - 1
};
protected:
SkGradientShaderBase(SkFlattenableReadBuffer& );
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
SkUnitMapper* fMapper;
SkMatrix fPtsToUnit; // set by subclass
SkMatrix fDstToIndex;
SkMatrix::MapXYProc fDstToIndexProc;
TileMode fTileMode;
TileProc fTileProc;
int fColorCount;
uint8_t fDstToIndexClass;
uint8_t fFlags;
struct Rec {
SkFixed fPos; // 0...1
uint32_t fScale; // (1 << 24) / range
};
Rec* fRecs;
const uint16_t* getCache16() const;
const SkPMColor* getCache32() const;
void commonAsAGradient(GradientInfo*) const;
private:
enum {
kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space
kStorageSize = kColorStorageCount * (sizeof(SkColor) + sizeof(Rec))
};
SkColor fStorage[(kStorageSize + 3) >> 2];
SkColor* fOrigColors; // original colors, before modulation by paint in setContext
bool fColorsAreOpaque;
mutable uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values
mutable SkPMColor* fCache32; // working ptr. If this is NULL, we need to recompute the cache values
mutable uint16_t* fCache16Storage; // storage for fCache16, allocated on demand
mutable SkMallocPixelRef* fCache32PixelRef;
mutable unsigned fCacheAlpha; // the alpha value we used when we computed the cache. larger than 8bits so we can store uninitialized value
static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count);
static void Build32bitCache(SkPMColor[], SkColor c0, SkColor c1, int count,
U8CPU alpha);
void setCacheAlpha(U8CPU alpha) const;
void initCommon();
typedef SkShader INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "gl/GrGLProgramStage.h"
class GrSamplerState;
class GrProgramStageFactory;
/*
* The intepretation of the texture matrix depends on the sample mode. The
* texture matrix is applied both when the texture coordinates are explicit
* and when vertex positions are used as texture coordinates. In the latter
* case the texture matrix is applied to the pre-view-matrix position
* values.
*
* Normal SampleMode
* The post-matrix texture coordinates are in normalize space with (0,0) at
* the top-left and (1,1) at the bottom right.
* RadialGradient
* The matrix specifies the radial gradient parameters.
* (0,0) in the post-matrix space is center of the radial gradient.
* Radial2Gradient
* Matrix transforms to space where first circle is centered at the
* origin. The second circle will be centered (x, 0) where x may be
* 0 and is provided by setRadial2Params. The post-matrix space is
* normalized such that 1 is the second radius - first radius.
* SweepGradient
* The angle from the origin of texture coordinates in post-matrix space
* determines the gradient value.
*/
// Base class for Gr gradient effects
class GrGradientEffect : public GrCustomStage {
public:
GrGradientEffect(GrContext* ctx, const SkGradientShaderBase& shader,
GrSamplerState* sampler);
virtual ~GrGradientEffect();
unsigned int numTextures() const;
GrTexture* texture(unsigned int index) const;
bool useTexture() const { return fUseTexture; }
private:
GrTexture* fTexture;
bool fUseTexture;
typedef GrCustomStage INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
// Base class for GL gradient custom stages
class GrGLGradientStage : public GrGLProgramStage {
public:
GrGLGradientStage(const GrProgramStageFactory& factory);
virtual ~GrGLGradientStage();
// emit code that gets a fragment's color from an expression for t; for now
// this always uses the texture, but for simpler cases we'll be able to lerp
void emitColorLookup(GrGLShaderBuilder* builder, const char* t,
const char* outputColor, const char* samplerName);
private:
typedef GrGLProgramStage INHERITED;
};
#endif
#endif
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