DD::Image::DrawIop Class Referenceabstract

Inherits DD::Image::PixelIop.

Public Types

enum  {
  NORAMP, LINEAR, SMOOTH0, SMOOTH1,
  SMOOTH
}
 
- Public Types inherited from DD::Image::Op
enum  HandlesMode { eNoHandles, eHandlesUncooked, eHandlesCooked, eHandlesMax }
 
enum  PrevalidateResult { eFinished, eCancelled, eAbandoned }
 This is a tribool return value. Do not extend.
 
enum  HandleType {
  eNone, eMouseLeftClick, eMouseRightClick, eMouseMove,
  eMouseDrag, eMouseRelease, eSelectionChanged, eSelectionChangeFinished,
  eHandleDragTranslate, eHandleDragRotate, eHandleDragScale, eHandleDragPivot,
  eAllHandles
}
 
enum  ViewableModes { eViewableMode2D, eViewableMode3D, eViewableMode3D_2DReference }
 
enum  GenerateType {
  OUTPUT_OP, ANY_CONTEXT, INPUT_OP, INPUT_OP_PEEK,
  EXECUTABLE, EXECUTABLE_SKIP, EXECUTABLE_INPUT, UICONTEXT_ONLY
}
 
enum  NodeContext { eNodeGraph, eTimeline, eOpGraph }
 
enum  StatusFlags { StatusNone, StatusModal, StatusUseCallback }
 
enum  PopUpScheme {
  ePU_Never, ePU_Done, ePU_Once, ePU_Default,
  ePU_Always
}
 Pop-up schemes determine when pop-up messages are displayed for op errors. More...
 
typedef std::pair< int, DD::Image::Op * > Output
 Combination of input number and pointer to Op.
 
typedef std::set< OutputOutputSet
 Set of all outputs from this Op.
 
typedef std::map< Hash, std::vector< unsigned int > > ItemSelectionList
 
typedef bool( EventCallback) (Op *op, EventContext eventCtx)
 
- Public Types inherited from DD::Image::IopInfoOwner
typedef IopInfo Info
 

Public Member Functions

void calculate_guides ()
 
virtual bool draw_engine (int y, int x, int r, float *buffer)=0
 
 DrawIop (Node *node)
 
void input_knobs (Knob_Callback)
 
void output_knobs (Knob_Callback, bool ramp=true)
 
int optional_input () const
 
int minimum_inputs () const
 
int maximum_inputs () const
 
Opdefault_input (int) const
 
float uses_input (int) const
 
const char * input_label (int, char *) const
 
unsigned node_color () const
 
- Public Member Functions inherited from DD::Image::PixelIop
 PixelIop (Node *node)
 
unsigned node_color () const override
 
- Public Member Functions inherited from DD::Image::Iop
void fetchPlane (ImagePlane &imagePlane)
 
virtual PlanarIgetPlanarI ()
 
void force_validate (bool for_real=true) override
 
IopImpl * pImpl ()
 
Iopiop () override
 Cast to an Iop. This is much cheaper and safer than using dynamic_cast.
 
const Iopiop () const override
 
virtual ~Iop ()
 
bool test_input (int, Op *) const override
 
Opdefault_input (int) const override
 
Iopinput (int n) const
 
Iopinput (int n, int m) const
 
Iopinput0 () const
 
Iopinput1 () const
 
Cache * cache () const
 
bool cached () const
 
void cached (bool b)
 
ChannelMask out_channels () const
 
int raw_channels_from () const
 
virtual bool pass_transform () const
 
void request (int x, int y, int r, int t, ChannelMask channels, int count)
 
void request (DD::Image::Box box, ChannelMask channels, int count)
 
void request (ChannelMask channels, int count)
 
void _copyState (Iop *input)
 
const BoxrequestedBox () const
 
const BoxunclampedRequestedBox () const
 
ChannelMask requested_channels () const
 
ChannelMask multi_requested_channels () const
 
ChannelMask unclamped_requested_channels () const
 
int requested_count () const
 
virtual void get (int y, int x, int r, ChannelMask, Row &)
 
void at (int x, int y, Pixel &out)
 
float at (int x, int y, Channel)
 
ChannelSet peek (int x, int y, int r, int t, Pixel &out)
 
bool peek (int x, int y, int w, int h, ChannelMask pixelChannels, PixelCallbackI &callback)
 
virtual TransformgetTransform ()
 
virtual bool set_texturemap (ViewerContext *, bool gl=true)
 
virtual void unset_texturemap (ViewerContext *)
 
virtual bool shade_GL (ViewerContext *, GeoInfo &)
 
virtual void vertex_shader (VertexContext &)
 
virtual void fragment_shader (const VertexContext &, Pixel &out)
 
virtual void displacement_shader (const VertexContext &vtx, VArray &out)
 
virtual float displacement_bound () const
 
virtual void blending_shader (const Pixel &in, Pixel &out)
 
virtual void render_state (GeoInfoRenderState &state)
 
virtual void sample (float cx, float cy, float w, float h, Filter *, Pixel &out)
 
void sample (float cx, float cy, float w, float h, Pixel &out)
 
virtual void sample (const Vector2 &center, const Vector2 &dU, const Vector2 &dV, Filter *filter, Pixel &out)
 
void sample (const Vector2 &center, const Vector2 &dU, const Vector2 &dV, Pixel &out)
 
virtual float sample_shadowmap (Iop *map, bool map_is_one_over_z, float cx, float cy, float W, float H, Filter *filter, float Pz)
 
void build_handles (ViewerContext *) override
 
virtual void inputsAttached ()
 
virtual void gpuEngine_useTextureTransform (bool useTransform)
 GPU support code. More...
 
virtual void gpuEngine_setupTextureTransform (const Matrix4 &postOpTransform)
 
virtual const char * gpuEngine_decl () const
 
virtual const char * gpuEngine_body () const
 
virtual Hash gpuEngine_shader_hash_at (double time)
 
virtual int gpuEngine_getNumRequiredTexUnits () const
 
virtual void gpuEngine_GL_begin (GPUContext *context)
 
virtual void gpuEngine_GL_end (GPUContext *context)
 
virtual IopviewerPassThrough () const
 
- Public Member Functions inherited from DD::Image::Op
PrevalidateResult preValidate (ViewerContext *ctx=nullptr, PreValidateContext *=nullptr)
 
OprootOp () const
 
bool preValidateAborted (int treeStartingVersion, PrevalidateResult &result) const
 
const OutputSetgetOutputs () const
 return all the outputs of this node
 
virtual void setInputsValid (bool nowValid)
 set whether the input ops are valid (are for the right context)
 
bool inputsValid () const
 return whether the input ops are valid (are for the right context)
 
virtual bool can_clone () const
 returns whether or not an op can be cloned in the dag
 
bool haveHash () const
 return true if the hash() value is meaningful and globally unique
 
virtual std::vector< DD::Image::OutputContextgetPrevVersionsWanted () const
 
virtual const MetaData::Bundle_fetchMetaData (const char *keyname)
 
const MetaData::BundlefetchMetaData (const char *keyname)
 
Node * node () const
 
DD::Image::NodeI * getNode () const
 
void node (Node *v)
 
OpfirstOp () const
 
void firstOp (Op *v)
 
Opparent () const
 
void parent (Op *lpOp)
 
virtual void detach ()
 node has been deleted in DAG
 
virtual void attach ()
 node has been created in DAG
 
virtual void pre_write_knobs ()
 
virtual void knobs (Knob_Callback)
 
int replace_knobs (Knob *afterthis, int n, void(*f)(void *, Knob_Callback), void *, const char *fileExt=nullptr)
 
int add_knobs (void(*f)(void *, Knob_Callback), void *, Knob_Callback)
 
void set_unlicensed ()
 
Knobknob (const char *name) const
 
Knobknob (int) const
 
bool pushed () const
 
bool panel_visible () const
 
bool node_disabled () const
 
bool node_selected () const
 
unsigned node_gl_color () const
 
void * field (const char *name)
 
void * field (const char *name, int &type)
 
void * set_field (const char *name, const void *source, int size)
 
void * get_field (const char *name, void *dest, int size)
 
void beginHandle (HandleType command, ViewerContext *ctx, EventCallback *cb, int index, float x=0, float y=0, float z=0, ViewerContext::Cursor cursor=ViewerContext::kNoCursor)
 
void endHandle (ViewerContext *ctx)
 
virtual int knob_change_finished (Knob *knob, bool changedByUser=true)
 
void addTime (OpTimer::Category category, long long microsecondsCPU, long long microsecondsWall, bool isTopLevel=true)
 
void getPerformanceInfo (OpTimer::Category category, OpTimer::PerformanceInfo &info) const
 return the amount of CPU time taken by this op
 
virtual bool inputs_clockwise () const
 whether unconnected inputs on the DAG should be arranged clockwise or anticlockwise (default)
 
virtual std::vector< int > input_order () const
 
virtual int inputArrows (int nodeInputs) const
 
bool script_command (const char *command, bool py=true, bool eval=true) const
 
bool script_expand (const char *str) const
 
HandlesMode anyHandles (ViewerContext *ctx)
 
void add_draw_handle (ViewerContext *)
 
virtual void add_input_handle (int input, ViewerContext *)
 
void add_op_handle (ViewerContext *ctx)
 
void add_knob_handle (Knob *, ViewerContext *)
 
virtual int getViewableModes () const
 
int inputs () const
 
int node_inputs () const
 
Opnode_input (int, GenerateType=OUTPUT_OP) const
 
Opnode_input (int, GenerateType, const DD::Image::OutputContext *outputContext) const
 
Opinput_op (int n=0) const
 
virtual void inputs (int n)
 
Opinput (int) const
 
int inputNumber (int input, int offset) const
 
Opinput (int input, int offset) const
 
Opinput0 () const
 return the primary input More...
 
Opinput1 () const
 return the second input, if it exists More...
 
const std::vector< Op * > & getInputs () const
 
const std::vector< Op * > & getChildren () const
 
virtual void set_input (int i, Op *op, int input, int offset)
 
void set_input0 (Op *op)
 
void set_input (int i, Op *op)
 
void set_input (int i, Op &op)
 
void set_input (int input, int offset, Op *op)
 
const OutputContextoutputContext () const
 
virtual void setOutputContext (const OutputContext &c)
 
virtual void append (Hash &)
 
virtual void build_splits ()
 
virtual int split_input (int) const
 
virtual const OutputContextinputContext (int n, int offset, OutputContext &) const
 
virtual const OutputContextinputUIContext (int n, OutputContext &) const
 
const Hashhash () const
 
virtual bool frameTransformImplemented () const
 
virtual bool frameTransformDownstream (const OutputContext &context, unsigned int input, float inFrame, float &outFrame) const
 
virtual bool frameTransformUpstream (const OutputContext &context, unsigned int input, float outFrame, float &inFrame) const
 
virtual DopeItemFlags::Mask getDopeItemFlags () const
 
virtual bool shouldHideInDopeSheet (Knob *knob) const
 
virtual DD::Image::KnobgetDopeItemKnob () const
 
virtual ViewSet viewsProduced () const
 
virtual ViewSet viewsWantOn (int i) const
 
virtual ViewSet splitForViews () const
 
bool requested () const
 
void setRequested ()
 
void forgetRequestShallow ()
 
void forget_request ()
 
void forget_request (std::set< Op * > &forgotten)
 
virtual const char * node_shape () const
 
DD::Image::Hash curveHash () const
 
bool opCurrent () const
 
virtual const char * node_help () const =0
 
virtual std::string input_longlabel (int) const
 
void node_redraw ()
 
void print_name (std::ostream &o) const
 
NodeContext nodeContext () const
 
std::string node_name () const
 
void invalidateSameHash ()
 
bool invalidate ()
 
bool invalidate (const Hash &hash)
 
bool update (const Box *=nullptr)
 
void asapUpdate ()
 
void asapUpdate (const Box &box, int direction=0)
 
void validate (bool for_real=true)
 
void update_handles () const
 
bool valid () const
 Returns true if it has been validated - including if there was an error. More...
 
bool real_valid () const
 Returns true if it has been real-validated - including if there was an error. More...
 
bool inErrorState () const
 
bool inInvalidState () const
 
bool opened () const
 
void open ()
 
void unopen ()
 
bool running () const
 
void running (bool v)
 
bool not_closed () const
 
void close ()
 
void callCloseAfter (double seconds)
 
void copyState (Op *input)
 
bool cached () const
 
void cached (bool b)
 
virtual Executableexecutable ()
 
void setKnobsToContext (const OutputContext &)
 
void gotoContext (const OutputContext &, bool update)
 
void progressFraction (double fraction, StatusFlags flags=StatusNone)
 
void progressFraction (int a, int b, StatusFlags flags=StatusNone)
 
void progressMessage (const char *fmt,...)
 
void progressModalMessage (const char *fmt,...)
 
void progressDismiss ()
 
int slowness () const
 
void slowness (int newval)
 
virtual bool firstEngineRendersWholeRequest () const
 
virtual bool updateUI (const OutputContext &context)
 
const Formatinput_format () const
 
const OutputContextuiContext () const
 
void error (const char *fmt,...)
 
void warning (const char *fmt,...)
 
void critical (const char *fmt,...)
 
void debug (const char *fmt,...)
 
void abort () const
 Abort all trees the op is in.
 
bool aborted () const
 True if one of the trees the op is in was aborted; ops should check this while processing and return quickly when true.
 
void cancel () const
 Cancel all trees the op is in. Make sure you also call abort() to stop processing.
 
bool cancelled () const
 True if one of the trees the op is in was cancelled (by user interaction)
 
bool addToTree (OpTree *lpTree)
 Returns true if the op was added to the tree, or false if its reference count increased.
 
bool removeFromTree (OpTree *lpTree)
 Returns false if the op was removed from the tree, or true if its reference count decreased.
 
bool isInTree (OpTree *lpTree) const
 Checks if an op is in a particular tree, for debugging purposes.
 
bool isInAnyTree () const
 Checks if an op is in any tree at all.
 
OpTreeHandlergetTreeHandler () const
 Returns the treeHandler for a given Op.
 
bool hasError () const
 
bool opOrChildHasError () const
 
const OpgetErroredOp () const
 
void setPopUpScheme (PopUpScheme lScheme)
 
PopUpScheme getPopUpScheme () const
 
bool arePopUpsEnabled ()
 Returns whether a pop-up should be enabled for the next message, modifying internal data when necessary.
 
OpMessageHandlergetMsgHandler ()
 
const OpMessageHandlergetMsgHandler () const
 
std::string getDebugInfo () const
 Returns a string of debug information about the op. For internal use.
 
std::string getDetailedDebugInfo () const
 
bool tryValidate (bool for_real=true)
 
virtual GeoOpgeoOp ()
 Cast to a GeoOp. This is much cheaper and safer than using dynamic_cast.
 
virtual const GeoOpgeoOp () const
 
virtual ParticleOpparticleOp ()
 Cast to a ParticleOp. This is much cheaper and safer than using dynamic_cast.
 
virtual const ParticleOpparticleOp () const
 
virtual DeepOnlyOpdeepOnlyOp ()
 Cast to a DeepOnlyOp. This is much cheaper and safer than using dynamic_cast.
 
virtual const DeepOnlyOpdeepOnlyOp () const
 
virtual const char * Class () const =0
 
virtual const char * displayName () const
 
virtual std::string docsPath () const
 
virtual bool onAction (const ViewerContext *c, const DD::Image::Flags f, void *d)
 
Opget (const Description *description)
 
- Public Member Functions inherited from DD::Image::IopInfoOwner
const Infoinfo () const
 
int x () const
 
int y () const
 
int r () const
 
int t () const
 
int w () const
 
int h () const
 
bool is_constant () const
 
int clampx (int x) const
 
int clampy (int y) const
 
const Formatformat () const
 
const Formatfull_size_format () const
 
int ydirection () const
 
bool black_outside () const
 
ChannelMask channels () const
 
const GeneralInfogeneralInfo () const
 
const Info2Dinfo2D () const
 
int first_frame () const
 
int last_frame () const
 
void format (const Format &f)
 
void full_size_format (const Format &f)
 

Public Attributes

ChannelSet channelset
 
ChannelSet premult
 
float color1 [4]
 
float color0 [4]
 Colors for the ramp.
 
int ramp_type
 
double x0
 
double y0
 
double x1
 
double y1
 Control points for ramp.
 
float X
 
float Y
 Slopes of lines through the control points.
 
float deltaX
 Rate of color change horizontally.
 
float opacity_
 
Channel maskChannelMask_
 
Channel maskChannelInput_
 
bool replace
 
bool invert
 
bool invert_mask
 
bool inject
 
int cliptype
 
- Public Attributes inherited from DD::Image::Op
const MetaData::BundlemetaCache
 
Hash metaCacheHash
 

Protected Member Functions

void _validate (bool)
 
void _validate (bool, int x, int y, int r, int t)
 
void pixel_engine (const Row &, int y, int x, int r, ChannelMask, Row &)
 
void in_channels (int, ChannelSet &) const
 
HandlesMode doAnyHandles (ViewerContext *)
 
void build_handles (ViewerContext *)
 
void draw_handle (ViewerContext *)
 
int knob_changed (Knob *)
 
- Protected Member Functions inherited from DD::Image::PixelIop
void engine (int y, int x, int r, ChannelMask, Row &) override
 
- Protected Member Functions inherited from DD::Image::Iop
 Iop (Node *node)
 
virtual void _invalidate () override
 
virtual void _request (int x, int y, int r, int t, ChannelMask, int count)
 
virtual void _open () override
 
virtual void _close () override
 
virtual void doFetchPlane (ImagePlane &imagePlane)
 
bool inUse () const override
 
void copy_info (int input)
 
void copy_info (int input, ChannelMask)
 
void copy_info ()
 
void clear_info ()
 
void merge_info (int input=0)
 
void merge_info (int input, ChannelMask)
 
void mergeFrameRange (int input)
 
void set_out_channels (ChannelMask m)
 
void set_out_channels (ChannelSetInit m)
 
void set_out_channels (Channel z)
 
void raw_channels_from (int n)
 
void set_out_channels (ChannelMask m, int n)
 
IopasIop (Op *op) const
 
TransformgetDefaultTransform () const
 
template<class TileType >
void doSample (float cx, float cy, float w, float h, Filter *, Pixel &out)
 
template<class TileType >
float do_sample_shadowmap (Iop *map, bool map_is_one_over_z, float cx, float cy, float W, float H, Filter *filter, float Pz)
 
- Protected Member Functions inherited from DD::Image::Op
 Op (Node *node)
 The constructor is protected so only subclasses can create the base class.
 
Opcreate (Node *node, const char *name)
 
Opcreate (const char *name)
 
HandlesMode anyInputHandles (ViewerContext *)
 return if any of the inputs (recursively) wish to draw handles More...
 
HandlesMode anyKnobHandles (ViewerContext *)
 return if any of the knobs on this node wish to draw handles More...
 
void build_input_handles (ViewerContext *)
 
void build_knob_handles (ViewerContext *)
 
void disallowNoTrees ()
 Call this to tell the op that it should always have op trees for normal behaviour (for internal use)
 
virtual PrevalidateResult doPreValidate (ViewerContext *ctx=nullptr, PreValidateContext *=nullptr)
 

Additional Inherited Members

- Static Public Member Functions inherited from DD::Image::Iop
static Iopdefault_input (const OutputContext &)
 
static Opdefault_input (const Op *op)
 
static Channel channel (const char *name)
 
static const char * channel_name (Channel c)
 
- Static Public Member Functions inherited from DD::Image::Op
static int treeVersion ()
 get the current tree version
 
static bool nukeBusy ()
 is nuke processing something on a parallel thread?
 
static Opcreate (Node *node, const char *name, Op *p_op)
 
static Opcreate (const char *name, Op *p_op)
 
static void resetTimers ()
 reset all the performance timers
 
static void setTimingEnabled (bool enabled)
 turn performance timing on or off
 
static bool isTimingEnabled ()
 return whether performance timing is on or not
 
static const char * script_result (bool py=false)
 
static void script_unlock ()
 
static void all_forget_request ()
 
static void new_request_pass ()
 
static double callPendingClose (double seconds)
 
static void clearPendingClose ()
 
static Operror_op ()
 
static const char * error_message ()
 
static void clearAbortAndError ()
 To be removed.
 
static void SetDefaultPopUpEnable (bool lEnable)
 This is used by Nuke to indicate when ops using the default pop-up scheme should show pop-ups. Not recommended for customisation.
 
static const Descriptionfind_description (const char *name, const Op *op_)
 
static int message_f (char t, const char *,...)
 
static int message_vf (char t, const char *, va_list)
 
static void add_timeout (float t, TimeoutHandler, void *v=nullptr)
 
static void repeat_timeout (float t, TimeoutHandler, void *=nullptr)
 
static bool has_timeout (TimeoutHandler, void *=nullptr)
 
static void remove_timeout (TimeoutHandler, void *=nullptr)
 
- Static Public Attributes inherited from DD::Image::Iop
static bool sPreserveCaches
 
- Static Public Attributes inherited from DD::Image::Op
static unsigned current_request_pass
 
static void(* node_redraw_cb )(const Op *)
 
static void(* print_name_cb )(std::ostream &, const Op *)
 
static void(* status_callback )(const Op *, float, float, const char *, StatusFlags)
 
- Protected Attributes inherited from DD::Image::Iop
ChannelSet out_channels_
 protected so validate() can directly modify it
 
int raw_channels_from_
 
- Protected Attributes inherited from DD::Image::Op
bool _haveHash
 whether the _hash actually has been set by a call to invalidate(Hash) ever.
 
- Protected Attributes inherited from DD::Image::IopInfoOwner
Info info_
 

Detailed Description

This is a base class for operations that draw a black and white image (such as a shape, text, PostScript, etc). This base class provides a wrapper so that the image can be drawn into any channel, inverted, or merged or intersected with an input channel.

Member Function Documentation

void DrawIop::_validate ( bool  for_real)
protectedvirtual

This default version of _validate() assumes the drawing completely fills the union of the incoming bounding box and format. The bbox controls can be used to reduce the output size. Most subclasses should figure out the actual area they will draw and call the other _validate().

Reimplemented from DD::Image::Iop.

References DD::Image::IopInfo::black_outside(), DD::Image::IopInfoOwner::format(), DD::Image::IopInfoOwner::info(), DD::Image::IopInfoOwner::info_, DD::Image::Iop::input0(), DD::Image::Box::merge(), DD::Image::Box::r(), DD::Image::Box::t(), DD::Image::Op::validate(), DD::Image::Box::x(), and DD::Image::Box::y().

void DrawIop::_validate ( bool  for_real,
int  x,
int  y,
int  r,
int  t 
)
protected
void DrawIop::pixel_engine ( const Row in,
int  y,
int  x,
int  r,
ChannelMask  channels,
Row row 
)
protectedvirtual

The engine calls draw_engine() to get the black/white image and then merges the result with the input channels and using the settings of the color and invert flags. Somewhat complex as it tries hard to detect and mark lines that are cleared to zero, because other operators that use the output as a mask can save time when they know it is zero.

Implements DD::Image::PixelIop.

References ARRAY, DD::Image::IopInfoOwner::black_outside(), DD::Image::Iop::channel(), clamp(), color0, DD::Image::colourIndex(), DD::Image::ChannelSet::contains(), DD::Image::Row::copy(), DD::Image::Op::debug(), deltaX, draw_engine(), DD::Image::Row::erase(), DD::Image::IopInfoOwner::format(), DD::Image::Iop::get(), DD::Image::IopInfoOwner::info(), DD::Image::Iop::input1(), DD::Image::Format::pixel_aspect(), DD::Image::Row::pre_copy(), DD::Image::Box::r(), DD::Image::IopInfoOwner::t(), DD::Image::Box::t(), DD::Image::Row::writable(), DD::Image::IopInfoOwner::x(), DD::Image::Box::x(), Y, DD::Image::IopInfoOwner::y(), DD::Image::Box::y(), and y1.

void DD::Image::DrawIop::draw_handle ( ViewerContext )
protectedvirtual

Draws dotted lines to indicate the ramp.

Reimplemented from DD::Image::Op.

int DrawIop::knob_changed ( Knob k)
protectedvirtual

Shows only the relevant maskChannel control depending on whether the mask input is connected and being used. This avoids questions about what happens when you set both of them (the answer is that the maskChannelInput is used and the mask input is ignored).

Reimplemented from DD::Image::Op.

References DD::Image::Knob::hide(), DD::Image::Knob::inputChange, DD::Image::Knob::is(), DD::Image::Op::knob(), DD::Image::Op::node_input(), DD::Image::Knob::show(), DD::Image::Knob::showPanel, and DD::Image::Knob::visible().

bool DD::Image::DrawIop::draw_engine ( int  y,
int  x,
int  r,
float *  buffer 
)
pure virtual

The subclass only needs to provide this method that produces the image in monochrome, writing the locations between x and r in the buffer with values between 0.0 and 1.0.

This should return true if the row intersects the drawing. It can return false to indicate the row did not intersect the picture, in this case the buffer does not need to be filled with zeros and DrawIop will process the line much faster.

Referenced by pixel_engine().

void DrawIop::input_knobs ( Knob_Callback  f)
void DrawIop::output_knobs ( Knob_Callback  f,
bool  ramp = true 
)

Your subclass should call this to insert knobs that should be after the controls for your shape.

References DD::Image::AColor_knob(), color0, DD::Image::Enumeration_knob(), DD::Image::Knob::HIDDEN, DD::Image::Obsolete_knob(), DD::Image::SetFlags(), DD::Image::Tab_knob(), and DD::Image::XY_knob().



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