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Skia
2D Graphics Library
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Skia
2D Graphics Library
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#include <SkShader.h>
Classes | |
| struct | GradientInfo |
Public Types | |
| enum | GradientType { kNone_GradientType, kColor_GradientType, kLinear_GradientType, kRadial_GradientType, kSweep_GradientType, kConical_GradientType, kLast_GradientType = kConical_GradientType } |
| If the shader subclass can be represented as a gradient, asAGradient returns the matching GradientType enum (or kNone_GradientType if it cannot). More... | |
| enum | Type { kSkColorFilter_Type, kSkDrawable_Type, kSkDrawLooper_Type, kSkImageFilter_Type, kSkMaskFilter_Type, kSkPathEffect_Type, kSkPixelRef_Type, kSkUnused_Type4, kSkShaderBase_Type, kSkUnused_Type, kSkUnused_Type2, kSkUnused_Type3 } |
| typedef sk_sp< SkFlattenable >(* | Factory) (SkReadBuffer &) |
Public Member Functions | |
| virtual bool | isOpaque () const |
| Returns true if the shader is guaranteed to produce only opaque colors, subject to the SkPaint using the shader to apply an opaque alpha value. More... | |
| SkImage * | isAImage (SkMatrix *localMatrix, SkTileMode xy[2]) const |
| Iff this shader is backed by a single SkImage, return its ptr (the caller must ref this if they want to keep it longer than the lifetime of the shader). More... | |
| bool | isAImage () const |
| virtual GradientType | asAGradient (GradientInfo *info) const |
| sk_sp< SkShader > | makeWithLocalMatrix (const SkMatrix &) const |
| Return a shader that will apply the specified localMatrix to this shader. More... | |
| sk_sp< SkShader > | makeWithColorFilter (sk_sp< SkColorFilter >) const |
| Create a new shader that produces the same colors as invoking this shader and then applying the colorfilter. More... | |
| virtual Factory | getFactory () const =0 |
| Implement this to return a factory function pointer that can be called to recreate your class given a buffer (previously written to by your override of flatten(). More... | |
| virtual const char * | getTypeName () const =0 |
| Returns the name of the object's class. More... | |
| virtual void | flatten (SkWriteBuffer &) const |
| Override this if your subclass needs to record data that it will need to recreate itself from its CreateProc (returned by getFactory()). More... | |
| virtual Type | getFlattenableType () const =0 |
| sk_sp< SkData > | serialize (const SkSerialProcs *=nullptr) const |
| size_t | serialize (void *memory, size_t memory_size, const SkSerialProcs *=nullptr) const |
| bool | unique () const |
| May return true if the caller is the only owner. More... | |
| void | ref () const |
| Increment the reference count. More... | |
| void | unref () const |
| Decrement the reference count. More... | |
Static Public Member Functions | |
| static Factory | NameToFactory (const char name[]) |
| static const char * | FactoryToName (Factory) |
| static void | Register (const char name[], Factory) |
| static sk_sp< SkFlattenable > | Deserialize (Type, const void *data, size_t length, const SkDeserialProcs *procs=nullptr) |
Friends | |
| class | SkShaderBase |
Shaders specify the source color(s) for what is being drawn. If a paint has no shader, then the paint's color is used. If the paint has a shader, then the shader's color(s) are use instead, but they are modulated by the paint's alpha. This makes it easy to create a shader once (e.g. bitmap tiling or gradient) and then change its transparency w/o having to modify the original shader... only the paint's alpha needs to be modified.
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inherited |
If the shader subclass can be represented as a gradient, asAGradient returns the matching GradientType enum (or kNone_GradientType if it cannot).
Also, if info is not null, asAGradient populates info with the relevant (see below) parameters for the gradient. fColorCount is both an input and output parameter. On input, it indicates how many entries in fColors and fColorOffsets can be used, if they are non-NULL. After asAGradient has run, fColorCount indicates how many color-offset pairs there are in the gradient. If there is insufficient space to store all of the color-offset pairs, fColors and fColorOffsets will not be altered. fColorOffsets specifies where on the range of 0 to 1 to transition to the given color. The meaning of fPoint and fRadius is dependant on the type of gradient.
None: info is ignored. Color: fColorOffsets[0] is meaningless. Linear: fPoint[0] and fPoint[1] are the end-points of the gradient Radial: fPoint[0] and fRadius[0] are the center and radius Conical: fPoint[0] and fRadius[0] are the center and radius of the 1st circle fPoint[1] and fRadius[1] are the center and radius of the 2nd circle Sweep: fPoint[0] is the center of the sweep.
| Enumerator | |
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| kNone_GradientType | |
| kColor_GradientType | |
| kLinear_GradientType | |
| kRadial_GradientType | |
| kSweep_GradientType | |
| kConical_GradientType | |
| kLast_GradientType | |
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inherited |
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virtual |
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staticinherited |
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staticinherited |
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inlinevirtualinherited |
Override this if your subclass needs to record data that it will need to recreate itself from its CreateProc (returned by getFactory()).
DEPRECATED public : will move to protected ... use serialize() instead
Reimplemented in SkPath2DPathEffect, SkLayerDrawLooper, SkLine2DPathEffect, SkPath1DPathEffect, SkDiscretePathEffect, Sk2DPathEffect, and SkCornerPathEffect.
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pure virtualinherited |
Implement this to return a factory function pointer that can be called to recreate your class given a buffer (previously written to by your override of flatten().
Implemented in SkDrawable.
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pure virtualinherited |
Implemented in SkPathEffect, SkImageFilter, SkDrawable, SkDrawLooper, and SkMaskFilter.
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pure virtualinherited |
Returns the name of the object's class.
Implemented in SkDrawable.
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inline |
| SkImage* SkShader::isAImage | ( | SkMatrix * | localMatrix, |
| SkTileMode | xy[2] | ||
| ) | const |
Iff this shader is backed by a single SkImage, return its ptr (the caller must ref this if they want to keep it longer than the lifetime of the shader).
If not, return nullptr.
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inlinevirtual |
Returns true if the shader is guaranteed to produce only opaque colors, subject to the SkPaint using the shader to apply an opaque alpha value.
Subclasses should override this to allow some optimizations.
| sk_sp<SkShader> SkShader::makeWithColorFilter | ( | sk_sp< SkColorFilter > | ) | const |
Create a new shader that produces the same colors as invoking this shader and then applying the colorfilter.
Return a shader that will apply the specified localMatrix to this shader.
The specified matrix will be applied before any matrix associated with this shader.
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staticinherited |
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inlineinherited |
Increment the reference count.
Must be balanced by a call to unref().
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staticinherited |
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inherited |
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inherited |
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inlineinherited |
May return true if the caller is the only owner.
Ensures that all previous owner's actions are complete.
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inlineinherited |
Decrement the reference count.
If the reference count is 1 before the decrement, then delete the object. Note that if this is the case, then the object needs to have been allocated via new, and not on the stack.
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friend |