skia2/include/effects/SkPerlinNoiseShader.h

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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPerlinNoiseShader_DEFINED
#define SkPerlinNoiseShader_DEFINED
#include "SkShader.h"
/** \class SkPerlinNoiseShader
SkPerlinNoiseShader creates an image using the Perlin turbulence function.
It can produce tileable noise if asked to stitch tiles and provided a tile size.
In order to fill a large area with repeating noise, set the stitchTiles flag to
true, and render exactly a single tile of noise. Without this flag, the result
will contain visible seams between tiles.
The algorithm used is described here :
http://www.w3.org/TR/SVG/filters.html#feTurbulenceElement
*/
class SK_API SkPerlinNoiseShader : public SkShader {
public:
struct StitchData;
struct PaintingData;
/**
* About the noise types : the difference between the 2 is just minor tweaks to the algorithm,
* they're not 2 entirely different noises. The output looks different, but once the noise is
* generated in the [1, -1] range, the output is brought back in the [0, 1] range by doing :
* kFractalNoise_Type : noise * 0.5 + 0.5
* kTurbulence_Type : abs(noise)
* Very little differences between the 2 types, although you can tell the difference visually.
*/
enum Type {
kFractalNoise_Type,
kTurbulence_Type,
kFirstType = kFractalNoise_Type,
kLastType = kTurbulence_Type
};
/**
* This will construct Perlin noise of the given type (Fractal Noise or Turbulence).
*
* Both base frequencies (X and Y) have a usual range of (0..1).
*
* The number of octaves provided should be fairly small, although no limit is enforced.
* Each octave doubles the frequency, so 10 octaves would produce noise from
* baseFrequency * 1, * 2, * 4, ..., * 512, which quickly yields insignificantly small
* periods and resembles regular unstructured noise rather than Perlin noise.
*
* If tileSize isn't NULL or an empty size, the tileSize parameter will be used to modify
* the frequencies so that the noise will be tileable for the given tile size. If tileSize
* is NULL or an empty size, the frequencies will be used as is without modification.
*/
static SkShader* CreateFractalNoise(SkScalar baseFrequencyX, SkScalar baseFrequencyY,
int numOctaves, SkScalar seed,
const SkISize* tileSize = NULL);
static SkShader* CreateTurbulence(SkScalar baseFrequencyX, SkScalar baseFrequencyY,
int numOctaves, SkScalar seed,
const SkISize* tileSize = NULL);
/**
* Create alias for CreateTurbulunce until all Skia users changed
* its code to use the new naming
*/
static SkShader* CreateTubulence(SkScalar baseFrequencyX, SkScalar baseFrequencyY,
int numOctaves, SkScalar seed,
const SkISize* tileSize = NULL) {
return CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed, tileSize);
}
Revert of Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/249643002/) Reason for revert: Chromium side change landed along side DEPS roll that includes r14323. Original issue's description: > Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/207683004/) > > Reason for revert: > This is blocking the DEPS roll into Chromium. Failures can be seen here: > > http://build.chromium.org/p/tryserver.chromium/builders/android_dbg/builds/174333 > > Original issue's description: > > Extract most of the mutable state of SkShader into a separate Context object. > > > > SkShader currently stores some state during draw calls via setContext(...). > > Move that mutable state into a separate SkShader::Context class that is > > constructed on demand for the duration of the draw. > > > > Calls to setContext() are replaced with createContext() which returns a context > > corresponding to the shader object or NULL if the parameters to createContext > > are invalid. > > > > TEST=out/Debug/dm > > BUG=skia:1976 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14216 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14323 > > TBR=scroggo@google.com,skyostil@chromium.org,tomhudson@chromium.org,senorblanco@chromium.org,reed@google.com,bungeman@google.com,dominikg@chromium.org > NOTREECHECKS=true > NOTRY=true > BUG=skia:1976 > > Committed: http://code.google.com/p/skia/source/detail?r=14326 R=scroggo@google.com, skyostil@chromium.org, tomhudson@chromium.org, senorblanco@chromium.org, reed@google.com, bungeman@google.com, dominikg@chromium.org TBR=bungeman@google.com, dominikg@chromium.org, reed@google.com, scroggo@google.com, senorblanco@chromium.org, skyostil@chromium.org, tomhudson@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia:1976 Author: bsalomon@google.com Review URL: https://codereview.chromium.org/246403013 git-svn-id: http://skia.googlecode.com/svn/trunk@14328 2bbb7eff-a529-9590-31e7-b0007b416f81
2014-04-23 19:10:51 +00:00
virtual size_t contextSize() const SK_OVERRIDE;
class PerlinNoiseShaderContext : public SkShader::Context {
public:
PerlinNoiseShaderContext(const SkPerlinNoiseShader& shader, const ContextRec&);
virtual ~PerlinNoiseShaderContext();
Revert of Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/249643002/) Reason for revert: Chromium side change landed along side DEPS roll that includes r14323. Original issue's description: > Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/207683004/) > > Reason for revert: > This is blocking the DEPS roll into Chromium. Failures can be seen here: > > http://build.chromium.org/p/tryserver.chromium/builders/android_dbg/builds/174333 > > Original issue's description: > > Extract most of the mutable state of SkShader into a separate Context object. > > > > SkShader currently stores some state during draw calls via setContext(...). > > Move that mutable state into a separate SkShader::Context class that is > > constructed on demand for the duration of the draw. > > > > Calls to setContext() are replaced with createContext() which returns a context > > corresponding to the shader object or NULL if the parameters to createContext > > are invalid. > > > > TEST=out/Debug/dm > > BUG=skia:1976 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14216 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14323 > > TBR=scroggo@google.com,skyostil@chromium.org,tomhudson@chromium.org,senorblanco@chromium.org,reed@google.com,bungeman@google.com,dominikg@chromium.org > NOTREECHECKS=true > NOTRY=true > BUG=skia:1976 > > Committed: http://code.google.com/p/skia/source/detail?r=14326 R=scroggo@google.com, skyostil@chromium.org, tomhudson@chromium.org, senorblanco@chromium.org, reed@google.com, bungeman@google.com, dominikg@chromium.org TBR=bungeman@google.com, dominikg@chromium.org, reed@google.com, scroggo@google.com, senorblanco@chromium.org, skyostil@chromium.org, tomhudson@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia:1976 Author: bsalomon@google.com Review URL: https://codereview.chromium.org/246403013 git-svn-id: http://skia.googlecode.com/svn/trunk@14328 2bbb7eff-a529-9590-31e7-b0007b416f81
2014-04-23 19:10:51 +00:00
virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE;
virtual void shadeSpan16(int x, int y, uint16_t[], int count) SK_OVERRIDE;
private:
SkPMColor shade(const SkPoint& point, StitchData& stitchData) const;
SkScalar calculateTurbulenceValueForPoint(
int channel,
Revert of Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/249643002/) Reason for revert: Chromium side change landed along side DEPS roll that includes r14323. Original issue's description: > Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/207683004/) > > Reason for revert: > This is blocking the DEPS roll into Chromium. Failures can be seen here: > > http://build.chromium.org/p/tryserver.chromium/builders/android_dbg/builds/174333 > > Original issue's description: > > Extract most of the mutable state of SkShader into a separate Context object. > > > > SkShader currently stores some state during draw calls via setContext(...). > > Move that mutable state into a separate SkShader::Context class that is > > constructed on demand for the duration of the draw. > > > > Calls to setContext() are replaced with createContext() which returns a context > > corresponding to the shader object or NULL if the parameters to createContext > > are invalid. > > > > TEST=out/Debug/dm > > BUG=skia:1976 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14216 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14323 > > TBR=scroggo@google.com,skyostil@chromium.org,tomhudson@chromium.org,senorblanco@chromium.org,reed@google.com,bungeman@google.com,dominikg@chromium.org > NOTREECHECKS=true > NOTRY=true > BUG=skia:1976 > > Committed: http://code.google.com/p/skia/source/detail?r=14326 R=scroggo@google.com, skyostil@chromium.org, tomhudson@chromium.org, senorblanco@chromium.org, reed@google.com, bungeman@google.com, dominikg@chromium.org TBR=bungeman@google.com, dominikg@chromium.org, reed@google.com, scroggo@google.com, senorblanco@chromium.org, skyostil@chromium.org, tomhudson@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia:1976 Author: bsalomon@google.com Review URL: https://codereview.chromium.org/246403013 git-svn-id: http://skia.googlecode.com/svn/trunk@14328 2bbb7eff-a529-9590-31e7-b0007b416f81
2014-04-23 19:10:51 +00:00
StitchData& stitchData, const SkPoint& point) const;
SkScalar noise2D(int channel,
Revert of Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/249643002/) Reason for revert: Chromium side change landed along side DEPS roll that includes r14323. Original issue's description: > Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/207683004/) > > Reason for revert: > This is blocking the DEPS roll into Chromium. Failures can be seen here: > > http://build.chromium.org/p/tryserver.chromium/builders/android_dbg/builds/174333 > > Original issue's description: > > Extract most of the mutable state of SkShader into a separate Context object. > > > > SkShader currently stores some state during draw calls via setContext(...). > > Move that mutable state into a separate SkShader::Context class that is > > constructed on demand for the duration of the draw. > > > > Calls to setContext() are replaced with createContext() which returns a context > > corresponding to the shader object or NULL if the parameters to createContext > > are invalid. > > > > TEST=out/Debug/dm > > BUG=skia:1976 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14216 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14323 > > TBR=scroggo@google.com,skyostil@chromium.org,tomhudson@chromium.org,senorblanco@chromium.org,reed@google.com,bungeman@google.com,dominikg@chromium.org > NOTREECHECKS=true > NOTRY=true > BUG=skia:1976 > > Committed: http://code.google.com/p/skia/source/detail?r=14326 R=scroggo@google.com, skyostil@chromium.org, tomhudson@chromium.org, senorblanco@chromium.org, reed@google.com, bungeman@google.com, dominikg@chromium.org TBR=bungeman@google.com, dominikg@chromium.org, reed@google.com, scroggo@google.com, senorblanco@chromium.org, skyostil@chromium.org, tomhudson@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia:1976 Author: bsalomon@google.com Review URL: https://codereview.chromium.org/246403013 git-svn-id: http://skia.googlecode.com/svn/trunk@14328 2bbb7eff-a529-9590-31e7-b0007b416f81
2014-04-23 19:10:51 +00:00
const StitchData& stitchData, const SkPoint& noiseVector) const;
SkMatrix fMatrix;
PaintingData* fPaintingData;
Revert of Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/249643002/) Reason for revert: Chromium side change landed along side DEPS roll that includes r14323. Original issue's description: > Revert of Extract most of the mutable state of SkShader into a separate Context object. (https://codereview.chromium.org/207683004/) > > Reason for revert: > This is blocking the DEPS roll into Chromium. Failures can be seen here: > > http://build.chromium.org/p/tryserver.chromium/builders/android_dbg/builds/174333 > > Original issue's description: > > Extract most of the mutable state of SkShader into a separate Context object. > > > > SkShader currently stores some state during draw calls via setContext(...). > > Move that mutable state into a separate SkShader::Context class that is > > constructed on demand for the duration of the draw. > > > > Calls to setContext() are replaced with createContext() which returns a context > > corresponding to the shader object or NULL if the parameters to createContext > > are invalid. > > > > TEST=out/Debug/dm > > BUG=skia:1976 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14216 > > > > Committed: http://code.google.com/p/skia/source/detail?r=14323 > > TBR=scroggo@google.com,skyostil@chromium.org,tomhudson@chromium.org,senorblanco@chromium.org,reed@google.com,bungeman@google.com,dominikg@chromium.org > NOTREECHECKS=true > NOTRY=true > BUG=skia:1976 > > Committed: http://code.google.com/p/skia/source/detail?r=14326 R=scroggo@google.com, skyostil@chromium.org, tomhudson@chromium.org, senorblanco@chromium.org, reed@google.com, bungeman@google.com, dominikg@chromium.org TBR=bungeman@google.com, dominikg@chromium.org, reed@google.com, scroggo@google.com, senorblanco@chromium.org, skyostil@chromium.org, tomhudson@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia:1976 Author: bsalomon@google.com Review URL: https://codereview.chromium.org/246403013 git-svn-id: http://skia.googlecode.com/svn/trunk@14328 2bbb7eff-a529-9590-31e7-b0007b416f81
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typedef SkShader::Context INHERITED;
};
virtual bool asNewEffect(GrContext* context, const SkPaint&, const SkMatrix*, GrColor*,
GrEffect**) const SK_OVERRIDE;
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPerlinNoiseShader)
protected:
SkPerlinNoiseShader(SkReadBuffer&);
virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
virtual Context* onCreateContext(const ContextRec&, void* storage) const SK_OVERRIDE;
private:
SkPerlinNoiseShader(SkPerlinNoiseShader::Type type, SkScalar baseFrequencyX,
SkScalar baseFrequencyY, int numOctaves, SkScalar seed,
const SkISize* tileSize);
virtual ~SkPerlinNoiseShader();
// TODO (scroggo): Once all SkShaders are created from a factory, and we have removed the
// constructor that creates SkPerlinNoiseShader from an SkReadBuffer, several fields can
// be made constant.
/*const*/ SkPerlinNoiseShader::Type fType;
/*const*/ SkScalar fBaseFrequencyX;
/*const*/ SkScalar fBaseFrequencyY;
/*const*/ int fNumOctaves;
/*const*/ SkScalar fSeed;
/*const*/ SkISize fTileSize;
/*const*/ bool fStitchTiles;
typedef SkShader INHERITED;
};
#endif