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Gimp/app/paint/gimppaintcore-loops.cc
Jehan 75e6f1062e app: fix "Luma Lighten/Darken only" layer modes. 
This is a continuation of #5888 as I realized that most layer modes were
fixed with my commit b3fc24268a (and follow-up f40dc40cbc) but at least
2 were still crashing GIMP: "Luma Lighten/Darken only" modes.

There were 2 bugs here:

* The first bug was that when gimp_operation_layer_mode_real_process()
  ran, gimp_operation_layer_mode_prepare() had not been run yet.
  prepare() is called before the process() of GeglOperation, but it
  would seem the process() of GimpOperationLayerMode on the other end
  happens before GeglOperation's prepare() is run. I am absolutely
  unsure if this is expected or not and have a hard time figuring out
  all the details of the C/C++ cohabitation.
  As a solution, I am moving out the fish caching (the needed part
  inside gimp_operation_layer_mode_real_process()) in its own function
  so that I can easily call it separately before inspecting the fishes.

* The second issue was that some blend functions needed more than a
  GeglOperation alone. E.g. blend_function() for luma lighten
  gimp_operation_layer_mode_blend_luma_lighten_only() would call
  gegl_operation_get_source_space() which requires the node to exist.
  Similarly for the Luma darken only mode. So I keep both the node and
  operation around, and when finalizing, I free the node (which in turn
  frees the operation).

Ell > if you are reading our commits, I would really appreciate your
review (or fixes) of my code here! :)
2020-11-10 17:25:34 +01:00

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 2013 Daniel Sabo
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
extern "C"
{
#include "paint-types.h"
#include "gegl/gimp-babl.h"
#include "operations/layer-modes/gimp-layer-modes.h"
#include "core/gimptempbuf.h"
#include "operations/gimpoperationmaskcomponents.h"
#include "operations/layer-modes/gimpoperationlayermode.h"
#include "gimppaintcore-loops.h"
} /* extern "C" */
#define PIXELS_PER_THREAD \
(/* each thread costs as much as */ 64.0 * 64.0 /* pixels */)
/* In order to avoid iterating over the same region of the same buffers
* multiple times, when calling more than one of the paint-core loop functions
* (hereafter referred to as "algorithms") in succession, we provide a single
* function, gimp_paint_core_loops_process(), which can be used to perform
* multiple algorithms in a row. This function takes a pointer to a
* GimpPaintCoreLoopsParams structure, providing the parameters for the
* algorithms, and a GimpPaintCoreLoopsAlgorithm bitset, which specifies the
* set of algorithms to run; currently, the algorithms are always run in a
* fixed order. For convenience, we provide public functions for the
* individual algorithms, but they're merely wrappers around
* gimp_paint_core_loops_process().
*
* We use some C++ magic to statically generate specialized versions of
* gimp_paint_core_loops_process() for all possible combinations of algorithms,
* and, where relevant, formats and input parameters, and to dispatch to the
* correct version at runtime.
*
* To achieve this, each algorithm provides two components:
*
* - The algorithm class template, which implements the algorithm, following
* a common interface. See the AlgorithmBase class for a description of
* the interface. Each algorithm class takes its base class as a template
* parameter, which allows us to construct a class hierarchy corresponding
* to a specific set of algorithms. Some classes in the hierarchy are not
* algorithms themselves, but are rather helpers, which provide some
* functionality to the algorithms further down the hierarchy, such as
* access to specific buffers.
*
* - A dispatch function, which takes the input parameters, the requested set
* of algorithms, the (type of) the current algorithm hierarchy, and a
* visitor object. The function calls the visitor with a (potentially)
* modified hierarchy, depending on the input. Ihe dispatch function for
* an algorithm checks if the requested set of algorithms contains a
* certain algorithm, adds the said algorithm to the hierarchy accordingly,
* and calls the visitor with the new hierarchy. See the AlgorithmDispatch
* class, which provides a dispatch-function implementation which
* algorithms can use instead of providing their own dispatch function.
*
* Helper classes in the hierarchy may also provide dispatch functions,
* which likewise modify the hierarchy based on the input parameters. For
* example, the dispatch_paint_mask() function adds a certain PaintMask
* specialization to the hierarchy, depending on the format of the paint
* mask buffer; this can be used to specialize algorithms based on the mask
* format; an algorithm that depends on the paint mask may dispatch through
* this function, before modifying the hierarchy itself.
*
* The dispatch() function is used to construct an algorithm hierarchy by
* dispatching through a list of functions. gimp_paint_core_loops_process()
* calls dispatch() with the full list of algorithm dispatch functions,
* receiving in return the algorithm hierarchy matching the input. It then
* uses the algorithm interface to perform the actual processing.
*/
enum
{
ALGORITHM_PAINT_BUF = 1u << 31,
ALGORITHM_PAINT_MASK = 1u << 30,
ALGORITHM_STIPPLE = 1u << 29,
ALGORITHM_COMP_MASK = 1u << 28,
ALGORITHM_TEMP_COMP_MASK = 1u << 27,
ALGORITHM_COMP_BUFFER = 1u << 26,
ALGORITHM_TEMP_COMP_BUFFER = 1u << 25,
ALGORITHM_CANVAS_BUFFER_ITERATOR = 1u << 24,
ALGORITHM_MASK_BUFFER_ITERATOR = 1u << 23
};
template <class T>
struct identity
{
using type = T;
};
/* dispatch():
*
* Takes a list of dispatch function objects, and calls each of them, in order,
* with the same 'params' and 'algorithms' parameters, passing 'algorithm' as
* the input hierarchy to the first dispatch function, and passing the output
* hierarchy of the previous dispatch function as the input hierarchy for the
* next dispatch function. Calls 'visitor' with the output hierarchy of the
* last dispatch function.
*
* Each algorithm hierarchy should provide a 'filter' static data member, and
* each dispatch function object should provide a 'mask' static data member.
* If the bitwise-AND of the current hierarchy's 'filter' member and the
* current dispatch function's 'mask' member is equal to 'mask', the dispatch
* function is skipped. This can be used to make sure that a class appears
* only once in the hierarchy, even if its dispatch function is used multiple
* times, or to prevent an algorithm from being dispatched, if it cannot be
* used together with another algorithm.
*/
template <class Visitor,
class Algorithm>
static inline void
dispatch (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm)
{
visitor (algorithm);
}
template <class Algorithm,
class Dispatch,
gboolean = (Algorithm::filter & Dispatch::mask) == Dispatch::mask>
struct dispatch_impl
{
template <class Visitor,
class... DispatchRest>
static void
apply (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm,
Dispatch disp,
DispatchRest... disp_rest)
{
disp (
[&] (auto algorithm)
{
dispatch (visitor, params, algorithms, algorithm, disp_rest...);
},
params, algorithms, algorithm);
}
};
template <class Algorithm,
class Dispatch>
struct dispatch_impl<Algorithm, Dispatch, TRUE>
{
template <class Visitor,
class... DispatchRest>
static void
apply (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm,
Dispatch disp,
DispatchRest... disp_rest)
{
dispatch (visitor, params, algorithms, algorithm, disp_rest...);
}
};
template <class Visitor,
class Algorithm,
class Dispatch,
class... DispatchRest>
static inline void
dispatch (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm,
Dispatch disp,
DispatchRest... disp_rest)
{
dispatch_impl<Algorithm, Dispatch>::apply (
visitor, params, algorithms, algorithm, disp, disp_rest...);
}
/* value_to_float():
*
* Converts a component value to float.
*/
static inline gfloat
value_to_float (guint8 value)
{
return value / 255.0f;
}
static inline gfloat
value_to_float (gfloat value)
{
return value;
}
template <class T>
static inline gfloat
value_to_float (T value) = delete;
/* AlgorithmBase:
*
* The base class of the algorithm hierarchy.
*/
struct AlgorithmBase
{
/* Used to filter-out dispatch functions; see the description of dispatch().
* Algorithms that redefine 'filter' should bitwise-OR their filter with that
* of their base class.
*/
static constexpr guint filter = 0;
/* The current maximal number of iterators used by the hierarchy. Algorithms
* should redefine 'max_n_iterators' by adding the maximal number of
* iterators they use to this value.
*/
static constexpr gint max_n_iterators = 0;
/* Non-static data members should be initialized in the constructor, and
* should not be further modified.
*/
explicit
AlgorithmBase (const GimpPaintCoreLoopsParams *params)
{
}
/* Algorithms should store their dynamic state in the 'State' member class
* template. This template will be instantiated with the most-derived type
* of the hierarchy, which allows an algorithm to depend on the properties of
* its descendants. Algorithms that provide their own 'State' class should
* derive it from the 'State' class of their base class, passing 'Derived' as
* the template argument.
*
* Algorithms can be run in parallel on multiple threads. In this case, each
* thread uses its own 'State' object, while the algorithm object itself is
* either shared, or is a copy of a shared algorithm object. Either way, the
* algorithm object itself is immutable, while the state object is mutable.
*/
template <class Derived>
struct State
{
};
/* The 'init()' function is called once per state object before processing
* starts, and should initialize the state object, and, if necessary, the
* iterator.
*
* 'params' is the same parameter struct passed to the constructor. 'state'
* is the state object. 'iter' is the iterator; each distinct state object
* uses a distinct iterator; if the algorithm hierarchy doesn't use any
* iterator, 'iter' may be NULL. 'roi' is the full region to be processed.
* 'area' is the subregion to be processed by the current state object.
*
* An algorithm that overrides this function should call the 'init()'
* function of its base class first, using the same arguments.
*/
template <class Derived>
void
init (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area) const
{
}
/* The 'init_step()' function is called once after each
* 'gegl_buffer_iterator_next()' call, and should perform any necessary
* initialization required before processing the current chunk.
*
* The parameters are the same as for 'init()', with the addition of 'rect',
* which is the area of the current chunk.
*
* An algorithm that overrides this function should call the 'init_step()'
* function of its base class first, using the same arguments.
*/
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
}
/* The 'process_row()' function is called for each row in the current chunk,
* and should perform the actual processing.
*
* The parameters are the same as for 'init_step()', with the addition of
* 'y', which is the current row.
*
* An algorithm that overrides this function should call the 'process_row()'
* function of its base class first, using the same arguments.
*/
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
}
/* The 'finalize_step()' function is called once per chunk after its
* processing is done, and should finalize any chunk-specific resources of
* the state object.
*
* 'params' is the same parameter struct passed to the constructor. 'state'
* is the state object.
*
* An algorithm that overrides this function should call the
* 'finalize_step()' function of its base class after performing its own
* finalization, using the same arguments.
*/
template <class Derived>
void
finalize_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state) const
{
}
/* The 'finalize()' function is called once per state object after processing
* is done, and should finalize the state object.
*
* 'params' is the same parameter struct passed to the constructor. 'state'
* is the state object.
*
* An algorithm that overrides this function should call the 'finalize()'
* function of its base class after performing its own finalization, using
* the same arguments.
*/
template <class Derived>
void
finalize (const GimpPaintCoreLoopsParams *params,
State<Derived> *state) const
{
}
};
/* BasicDispatch:
*
* A class template implementing a simple dispatch function object, which adds
* an algorithm to the hierarchy unconditionally. 'AlgorithmTemplate' is the
* alogithm class template (usually a helper class, rather than an actual
* algorithm), 'Mask' is the dispatch function mask, as described in
* 'dispatch()', and 'Dependencies' is a list of (types of) dispatch functions
* the algorithm depends on.
*
* Before adding the algorithm to the hierarchy, the hierarchy is augmented by
* dispatching through the list of dependencies, in order.
*/
template <template <class Base> class AlgorithmTemplate,
guint Mask,
class... Dependencies>
struct BasicDispatch
{
static constexpr guint mask = Mask;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
dispatch (
[&] (auto algorithm)
{
using NewAlgorithm = typename decltype (algorithm)::type;
visitor (identity<AlgorithmTemplate<NewAlgorithm>> ());
},
params, algorithms, algorithm, Dependencies ()...);
}
};
template <template <class Base> class AlgorithmTemplate,
guint Mask>
struct BasicDispatch<AlgorithmTemplate, Mask>
{
static constexpr guint mask = Mask;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
visitor (identity<AlgorithmTemplate<Algorithm>> ());
}
};
/* AlgorithmDispatch:
*
* A class template implementing a dispatch function suitable for dispatching
* algorithms. 'AlgorithmTemplate' is the algorithm class template, 'Mask' is
* the dispatch function mask, as described in 'dispatch()', and 'Dependencies'
* is a list of (types of) dispatch functions the algorithm depends on, used as
* explained below.
*
* 'AlgorithmDispatch' adds the algorithm to the hierarchy if it's included in
* the set of requested algorithms; specifically, if the bitwise-AND of the
* requested-algorithms bitset and of 'Mask' is equal to 'Mask'.
*
* Before adding the algorithm to the hierarchy, the hierarchy is augmented by
* dispatching through the list of dependencies, in order.
*/
template <template <class Base> class AlgorithmTemplate,
guint Mask,
class... Dependencies>
struct AlgorithmDispatch
{
static constexpr guint mask = Mask;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
if ((algorithms & mask) == mask)
{
dispatch (
[&] (auto algorithm)
{
using NewAlgorithm = typename decltype (algorithm)::type;
visitor (identity<AlgorithmTemplate<NewAlgorithm>> ());
},
params, algorithms, algorithm, Dependencies ()...);
}
else
{
visitor (algorithm);
}
}
};
/* MandatoryAlgorithmDispatch:
*
* A class template implementing a dispatch function suitable for dispatching
* algorithms that must be included in all hierarchies. 'AlgorithmTemplate' is
* the algorithm class template, 'Mask' is the dispatch function mask, as
* described in 'dispatch()', and 'Dependencies' is a list of (types of)
* dispatch functions the algorithm depends on, used as explained below.
*
* 'MandatoryAlgorithmDispatch' verifies that the algorithm is included in the
* set of requested algorithms (specifically, that the bitwise-AND of the
* requested-algorithms bitset and of 'Mask' is equal to 'Mask'), and adds the
* it to the hierarchy unconditionally.
*
* Before adding the algorithm to the hierarchy, the hierarchy is augmented by
* dispatching through the list of dependencies, in order.
*/
template <template <class Base> class AlgorithmTemplate,
guint Mask,
class... Dependencies>
struct MandatoryAlgorithmDispatch
{
static constexpr guint mask = Mask;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
g_return_if_fail ((algorithms & Mask) == Mask);
BasicDispatch<AlgorithmTemplate, Mask, Dependencies...> () (visitor,
params,
algorithms,
algorithm);
}
};
/* SuppressedAlgorithmDispatch:
*
* A class template implementing a placeholder dispatch function suitable for
* dispatching algorithms that are never included in any hierarchy.
* 'AlgorithmTemplate' is the algorithm class template, 'Mask' is the dispatch
* function mask, as described in 'dispatch()', and 'Dependencies' is a list of
* (types of) dispatch functions the algorithm depends on. Note that
* 'AlgorithmTemplate' and 'Dependencies' are not actually used, and are merely
* included for exposition.
*
* 'SuppressedAlgorithmDispatch' verifies that the algorithm is not included in
* the set of requested algorithms (specifically, that the bitwise-AND of the
* requested-algorithms bitset and of 'Mask' is not equal to 'Mask'), and
* doesn't modify the hierarchy.
*/
template <template <class Base> class AlgorithmTemplate,
guint Mask,
class... Dependencies>
struct SuppressedAlgorithmDispatch
{
static constexpr guint mask = Mask;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
g_return_if_fail ((algorithms & Mask) != Mask);
visitor (algorithm);
}
};
/* PaintBuf, dispatch_paint_buf():
*
* An algorithm helper class, providing access to the paint buffer. Algorithms
* that use the paint buffer should specify 'dispatch_paint_buf()' as a
* dependency, and access 'PaintBuf' members through their base type/subobject.
*/
template <class Base>
struct PaintBuf : Base
{
/* Component type of the paint buffer. */
using paint_type = gfloat;
static constexpr guint filter = Base::filter | ALGORITHM_PAINT_BUF;
/* Paint buffer stride, in 'paint_type' elements. */
gint paint_stride;
/* Pointer to the start of the paint buffer data. */
paint_type *paint_data;
explicit
PaintBuf (const GimpPaintCoreLoopsParams *params) :
Base (params)
{
paint_stride = gimp_temp_buf_get_width (params->paint_buf) * 4;
paint_data = (paint_type *) gimp_temp_buf_get_data (params->paint_buf);
}
};
static BasicDispatch<PaintBuf, ALGORITHM_PAINT_BUF> dispatch_paint_buf;
/* PaintMask, dispatch_paint_mask():
*
* An algorithm helper class, providing access to the paint mask. Algorithms
* that use the paint mask should specify 'dispatch_paint_mask()' as a
* dependency, and access 'PaintMask' members through their base type/
* subobject.
*/
template <class Base,
class MaskType>
struct PaintMask : Base
{
/* Component type of the paint mask. */
using mask_type = MaskType;
static constexpr guint filter = Base::filter | ALGORITHM_PAINT_MASK;
/* Paint mask stride, in 'mask_type' elements. */
gint mask_stride;
/* Pointer to the start of the paint mask data, taking the mask offset into
* account.
*/
const mask_type *mask_data;
explicit
PaintMask (const GimpPaintCoreLoopsParams *params) :
Base (params)
{
mask_stride = gimp_temp_buf_get_width (params->paint_mask);
mask_data =
(const mask_type *) gimp_temp_buf_get_data (params->paint_mask) +
params->paint_mask_offset_y * mask_stride +
params->paint_mask_offset_x;
}
};
struct DispatchPaintMask
{
static constexpr guint mask = ALGORITHM_PAINT_MASK;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
const Babl *mask_format = gimp_temp_buf_get_format (params->paint_mask);
if (mask_format == babl_format ("Y u8"))
visitor (identity<PaintMask<Algorithm, guint8>> ());
else if (mask_format == babl_format ("Y float"))
visitor (identity<PaintMask<Algorithm, gfloat>> ());
else
g_warning ("Mask format not supported: %s", babl_get_name (mask_format));
}
} static dispatch_paint_mask;
/* Stipple, dispatch_stipple():
*
* An algorithm helper class, providing access to the 'stipple' parameter.
* Algorithms that use the 'stipple' parameter should specify
* 'dispatch_stipple()' as a dependency, and access 'Stipple' members through
* their base type/subobject.
*/
template <class Base,
gboolean StippleFlag>
struct Stipple : Base
{
static constexpr guint filter = Base::filter | ALGORITHM_STIPPLE;
/* The value of the 'stipple' parameter, usable as a constant expression. */
static constexpr gboolean stipple = StippleFlag;
using Base::Base;
};
struct DispatchStipple
{
static constexpr guint mask = ALGORITHM_STIPPLE;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
if (params->stipple)
visitor (identity<Stipple<Algorithm, TRUE>> ());
else
visitor (identity<Stipple<Algorithm, FALSE>> ());
}
} static dispatch_stipple;
/* CompMask, dispatch_comp_mask(), has_comp_mask(), comp_mask_data():
*
* An algorithm helper class, providing access to the mask used for
* compositing. When this class is part of the hierarchy, 'DoLayerBlend' uses
* this buffer as the mask, instead of the input parameters' 'mask_buffer'.
* Algorithms that use the compositing mask should specify
* 'dispatch_comp_mask()' as a dependency, and access 'CompMask' members
* through their base type/subobject.
*
* Note that 'CompMask' only provides *access* to the compositing mask, but
* doesn't provide its actual *storage*. This is the responsibility of the
* algorithms that use 'CompMask'. Algorithms that need temporary storage for
* the compositing mask can use 'TempCompMask'.
*
* The 'has_comp_mask()' constexpr function determines if a given algorithm
* hierarchy uses the compositing mask.
*
* The 'comp_mask_data()' function returns a pointer to the compositing mask
* data for the current row if the hierarchy uses the compositing mask, or NULL
* otherwise.
*/
template <class Base>
struct CompMask : Base
{
/* Component type of the compositing mask. */
using comp_mask_type = gfloat;
static constexpr guint filter = Base::filter | ALGORITHM_COMP_MASK;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
/* Pointer to the compositing mask data for the current row. */
comp_mask_type *comp_mask_data;
};
};
static BasicDispatch<CompMask, ALGORITHM_COMP_MASK> dispatch_comp_mask;
template <class Base>
static constexpr gboolean
has_comp_mask (const CompMask<Base> *algorithm)
{
return TRUE;
}
static constexpr gboolean
has_comp_mask (const AlgorithmBase *algorithm)
{
return FALSE;
}
template <class Base,
class State>
static gfloat *
comp_mask_data (const CompMask<Base> *algorithm,
State *state)
{
return state->comp_mask_data;
}
template <class State>
static gfloat *
comp_mask_data (const AlgorithmBase *algorithm,
State *state)
{
return NULL;
}
/* TempCompMask, dispatch_temp_comp_mask():
*
* An algorithm helper class, providing temporary storage for the compositing
* mask. Algorithms that need a temporary compositing mask should specify
* 'dispatch_temp_comp_mask()' as a dependency, which itself includes
* 'dispatch_comp_mask()' as a dependency.
*/
template <class Base>
struct TempCompMask : Base
{
static constexpr guint filter = Base::filter | ALGORITHM_TEMP_COMP_MASK;
using Base::Base;
template <class Derived>
using State = typename Base::template State<Derived>;
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->comp_mask_data = gegl_scratch_new (gfloat, rect->width);
}
template <class Derived>
void
finalize_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state) const
{
gegl_scratch_free (state->comp_mask_data);
Base::finalize_step (params, state);
}
};
static BasicDispatch<
TempCompMask,
ALGORITHM_TEMP_COMP_MASK,
decltype (dispatch_comp_mask)
> dispatch_temp_comp_mask;
/* CompBuffer, dispatch_comp_buffer(), has_comp_buffer(), comp_buffer_data():
*
* An algorithm helper class, providing access to the output buffer used for
* compositing. When this class is part of the hierarchy, 'DoLayerBlend' uses
* this buffer as the output buffer, instead of the input parameters'
* 'dest_buffer'. Algorithms that use the compositing buffer should specify
* 'dispatch_comp_buffer()' as a dependency, and access 'CompBuffer' members
* through their base type/subobject.
*
* Note that 'CompBuffer' only provides *access* to the compositing buffer, but
* doesn't provide its actual *storage*. This is the responsibility of the
* algorithms that use 'CompBuffer'. Algorithms that need temporary storage
* for the compositing buffer can use 'TempCompBuffer'.
*
* The 'has_comp_buffer()' constexpr function determines if a given algorithm
* hierarchy uses the compositing buffer.
*
* The 'comp_buffer_data()' function returns a pointer to the compositing
* buffer data for the current row if the hierarchy uses the compositing
* buffer, or NULL otherwise.
*/
template <class Base>
struct CompBuffer : Base
{
/* Component type of the compositing buffer. */
using comp_buffer_type = gfloat;
static constexpr guint filter = Base::filter | ALGORITHM_COMP_BUFFER;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
/* Pointer to the compositing buffer data for the current row. */
comp_buffer_type *comp_buffer_data;
};
};
static BasicDispatch<CompBuffer, ALGORITHM_COMP_BUFFER> dispatch_comp_buffer;
template <class Base>
static constexpr gboolean
has_comp_buffer (const CompBuffer<Base> *algorithm)
{
return TRUE;
}
static constexpr gboolean
has_comp_buffer (const AlgorithmBase *algorithm)
{
return FALSE;
}
template <class Base,
class State>
static gfloat *
comp_buffer_data (const CompBuffer<Base> *algorithm,
State *state)
{
return state->comp_buffer_data;
}
template <class State>
static gfloat *
comp_buffer_data (const AlgorithmBase *algorithm,
State *state)
{
return NULL;
}
/* TempCompBuffer, dispatch_temp_comp_buffer():
*
* An algorithm helper class, providing temporary storage for the compositing
* buffer. Algorithms that need a temporary compositing buffer should specify
* 'dispatch_temp_comp_buffer()' as a dependency, which itself includes
* 'dispatch_comp_buffer()' as a dependency.
*/
template <class Base>
struct TempCompBuffer : Base
{
static constexpr guint filter = Base::filter | ALGORITHM_TEMP_COMP_BUFFER;
using Base::Base;
template <class Derived>
using State = typename Base::template State<Derived>;
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->comp_buffer_data = gegl_scratch_new (gfloat, 4 * rect->width);
}
template <class Derived>
void
finalize_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state) const
{
gegl_scratch_free (state->comp_buffer_data);
Base::finalize_step (params, state);
}
};
static BasicDispatch<
TempCompBuffer,
ALGORITHM_TEMP_COMP_BUFFER,
decltype (dispatch_comp_buffer)
> dispatch_temp_comp_buffer;
/* CanvasBufferIterator, DispatchCanvasBufferIterator:
*
* An algorithm helper class, providing iterator-access to the canvas buffer.
* Algorithms that iterate over the canvas buffer should specify
* 'DispatchCanvasBufferIterator<Access>' as a dependency, where 'Access' is
* the desired access mode to the canvas buffer, and access its members through
* their base type/subobject.
*/
template <class Base,
guint Access,
gboolean First>
struct CanvasBufferIterator;
template <class Base,
guint Access>
static constexpr gboolean
canvas_buffer_iterator_is_first (CanvasBufferIterator<Base, Access, TRUE> *algorithm)
{
return FALSE;
}
static constexpr gboolean
canvas_buffer_iterator_is_first (AlgorithmBase *algorithm)
{
return TRUE;
}
template <class Base,
guint Access,
gboolean First = canvas_buffer_iterator_is_first ((Base *) NULL)>
struct CanvasBufferIterator : Base
{
/* The combined canvas-buffer access mode used by the hierarchy, up to, and
* including, the current class.
*/
static constexpr GeglAccessMode canvas_buffer_access =
(GeglAccessMode) (Base::canvas_buffer_access | Access);
using Base::Base;
};
template <class Base,
guint Access>
struct CanvasBufferIterator<Base, Access, TRUE> : Base
{
/* The combined canvas-buffer access mode used by the hierarchy, up to, and
* including, the current class.
*/
static constexpr GeglAccessMode canvas_buffer_access =
(GeglAccessMode) Access;
static constexpr gint max_n_iterators =
Base::max_n_iterators + 1;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
gint canvas_buffer_iterator;
};
template <class Derived>
void
init (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area) const
{
state->canvas_buffer_iterator = gegl_buffer_iterator_add (
iter, params->canvas_buffer, area, 0, babl_format ("Y float"),
Derived::canvas_buffer_access, GEGL_ABYSS_NONE);
/* initialize the base class *after* initializing the iterator, to make
* sure that canvas_buffer is the primary buffer of the iterator, if no
* subclass added an iterator first.
*/
Base::init (params, state, iter, roi, area);
}
};
template <guint Access>
struct DispatchCanvasBufferIteratorHelper
{
template <class Base>
using algorithm_template = CanvasBufferIterator<Base, Access>;
};
template <guint Access>
using DispatchCanvasBufferIterator = BasicDispatch<
DispatchCanvasBufferIteratorHelper<Access>::template algorithm_template,
ALGORITHM_CANVAS_BUFFER_ITERATOR
>;
/* MaskBufferIterator, mask_buffer_iterator_dispatch(),
* has_mask_buffer_iterator():
*
* An algorithm helper class, providing read-only iterator-access to the mask
* buffer. Algorithms that iterate over the mask buffer should specify
* 'dispatch_mask_buffer_iterator()' as a dependency, and access
* 'MaskBufferIterator' members through their base type/subobject.
*
* The 'has_mask_buffer_iterator()' constexpr function determines if a given
* algorithm hierarchy uses has a mask-buffer iterator.
*
* The 'mask_buffer_iterator()' function returns the index of the mask-buffer
* iterator if the hierarchy has one, or -1 otherwise.
*/
template <class Base>
struct MaskBufferIterator : Base
{
static constexpr guint filter = Base::filter | ALGORITHM_MASK_BUFFER_ITERATOR;
static constexpr gint max_n_iterators = Base::max_n_iterators + 1;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
gint mask_buffer_iterator;
};
template <class Derived>
void
init (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area) const
{
Base::init (params, state, iter, roi, area);
GeglRectangle mask_area = *area;
mask_area.x -= params->mask_offset_x;
mask_area.y -= params->mask_offset_y;
state->mask_buffer_iterator = gegl_buffer_iterator_add (
iter, params->mask_buffer, &mask_area, 0, babl_format ("Y float"),
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
}
};
struct DispatchMaskBufferIterator
{
static constexpr guint mask = ALGORITHM_MASK_BUFFER_ITERATOR;
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
if (params->mask_buffer)
visitor (identity<MaskBufferIterator<Algorithm>> ());
else
visitor (algorithm);
}
} static dispatch_mask_buffer_iterator;
template <class Base>
static constexpr gboolean
has_mask_buffer_iterator (const MaskBufferIterator<Base> *algorithm)
{
return TRUE;
}
static constexpr gboolean
has_mask_buffer_iterator (const AlgorithmBase *algorithm)
{
return FALSE;
}
template <class Base,
class State>
static gint
mask_buffer_iterator (const MaskBufferIterator<Base> *algorithm,
State *state)
{
return state->mask_buffer_iterator;
}
template <class State>
static gint
mask_buffer_iterator (const AlgorithmBase *algorithm,
State *state)
{
return -1;
}
/* CombinePaintMaskToCanvasBufferToPaintBufAlpha,
* dispatch_combine_paint_mask_to_canvas_buffer_to_paint_buf_alpha():
*
* An algorithm class, providing an optimized version combining both the
* COMBINE_PAINT_MASK_TO_CANVAS_BUFFER and the CANVAS_BUFFER_TO_PAINT_BUF_ALPHA
* algorithms. Used instead of the individual implementations, when both
* algorithms are requested.
*/
template <class Base>
struct CombinePaintMaskToCanvasBufferToPaintBufAlpha : Base
{
using mask_type = typename Base::mask_type;
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_COMBINE_PAINT_MASK_TO_CANVAS_BUFFER |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_PAINT_BUF_ALPHA |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_PAINT_BUF_ALPHA |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
gfloat *canvas_pixel;
};
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->canvas_pixel =
(gfloat *) iter->items[state->canvas_buffer_iterator].data;
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
gint mask_offset = (y - roi->y) * this->mask_stride +
(rect->x - roi->x);
const mask_type *mask_pixel = &this->mask_data[mask_offset];
gint paint_offset = (y - roi->y) * this->paint_stride +
(rect->x - roi->x) * 4;
gfloat *paint_pixel = &this->paint_data[paint_offset];
gint x;
for (x = 0; x < rect->width; x++)
{
if (Base::stipple)
{
state->canvas_pixel[0] += (1.0 - state->canvas_pixel[0]) *
value_to_float (*mask_pixel) *
params->paint_opacity;
}
else
{
if (params->paint_opacity > state->canvas_pixel[0])
{
state->canvas_pixel[0] += (params->paint_opacity - state->canvas_pixel[0]) *
value_to_float (*mask_pixel) *
params->paint_opacity;
}
}
paint_pixel[3] *= state->canvas_pixel[0];
mask_pixel += 1;
state->canvas_pixel += 1;
paint_pixel += 4;
}
}
};
static SuppressedAlgorithmDispatch<
CombinePaintMaskToCanvasBufferToPaintBufAlpha,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_COMBINE_PAINT_MASK_TO_CANVAS_BUFFER |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_PAINT_BUF_ALPHA,
decltype (dispatch_paint_buf),
decltype (dispatch_paint_mask),
decltype (dispatch_stipple),
DispatchCanvasBufferIterator<GEGL_BUFFER_READWRITE>
>
dispatch_combine_paint_mask_to_canvas_buffer_to_paint_buf_alpha;
/* CombinePaintMaskToCanvasBuffer,
* dispatch_combine_paint_mask_to_canvas_buffer():
*
* An algorithm class, implementing the COMBINE_PAINT_MASK_TO_CANVAS_BUFFER
* algorithm.
*/
template <class Base>
struct CombinePaintMaskToCanvasBuffer : Base
{
using mask_type = typename Base::mask_type;
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_COMBINE_PAINT_MASK_TO_CANVAS_BUFFER |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_PAINT_BUF_ALPHA |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_PAINT_BUF_ALPHA |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
gfloat *canvas_pixel;
};
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->canvas_pixel =
(gfloat *) iter->items[state->canvas_buffer_iterator].data;
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
gint mask_offset = (y - roi->y) * this->mask_stride +
(rect->x - roi->x);
const mask_type *mask_pixel = &this->mask_data[mask_offset];
gint x;
for (x = 0; x < rect->width; x++)
{
if (Base::stipple)
{
state->canvas_pixel[0] += (1.0 - state->canvas_pixel[0]) *
value_to_float (*mask_pixel) *
params->paint_opacity;
}
else
{
if (params->paint_opacity > state->canvas_pixel[0])
{
state->canvas_pixel[0] += (params->paint_opacity - state->canvas_pixel[0]) *
value_to_float (*mask_pixel) *
params->paint_opacity;
}
}
mask_pixel += 1;
state->canvas_pixel += 1;
}
}
};
static AlgorithmDispatch<
CombinePaintMaskToCanvasBuffer,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_COMBINE_PAINT_MASK_TO_CANVAS_BUFFER,
decltype (dispatch_paint_mask),
decltype (dispatch_stipple),
DispatchCanvasBufferIterator<GEGL_BUFFER_READWRITE>
>
dispatch_combine_paint_mask_to_canvas_buffer;
/* CanvasBufferToPaintBufAlpha, dispatch_canvas_buffer_to_paint_buf_alpha():
*
* An algorithm class, implementing the CANVAS_BUFFER_TO_PAINT_BUF_ALPHA
* algorithm.
*/
template <class Base>
struct CanvasBufferToPaintBufAlpha : Base
{
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_PAINT_BUF_ALPHA |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_PAINT_BUF_ALPHA |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
const gfloat *canvas_pixel;
};
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->canvas_pixel =
(const gfloat *) iter->items[state->canvas_buffer_iterator].data;
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
/* Copy the canvas buffer in rect to the paint buffer's alpha channel */
gint paint_offset = (y - roi->y) * this->paint_stride +
(rect->x - roi->x) * 4;
gfloat *paint_pixel = &this->paint_data[paint_offset];
gint x;
for (x = 0; x < rect->width; x++)
{
paint_pixel[3] *= *state->canvas_pixel;
state->canvas_pixel += 1;
paint_pixel += 4;
}
}
};
static SuppressedAlgorithmDispatch<
CanvasBufferToPaintBufAlpha,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_PAINT_BUF_ALPHA,
decltype (dispatch_paint_buf),
DispatchCanvasBufferIterator<GEGL_BUFFER_READ>
>
dispatch_canvas_buffer_to_paint_buf_alpha;
/* PaintMaskToPaintBufAlpha, dispatch_paint_mask_to_paint_buf_alpha():
*
* An algorithm class, implementing the PAINT_MASK_TO_PAINT_BUF_ALPHA
* algorithm.
*/
template <class Base>
struct PaintMaskToPaintBufAlpha : Base
{
using mask_type = typename Base::mask_type;
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_PAINT_BUF_ALPHA |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
explicit
PaintMaskToPaintBufAlpha (const GimpPaintCoreLoopsParams *params) :
Base (params)
{
/* Validate that the paint buffer is within the bounds of the paint mask */
g_return_if_fail (gimp_temp_buf_get_width (params->paint_buf) <=
gimp_temp_buf_get_width (params->paint_mask) -
params->paint_mask_offset_x);
g_return_if_fail (gimp_temp_buf_get_height (params->paint_buf) <=
gimp_temp_buf_get_height (params->paint_mask) -
params->paint_mask_offset_y);
}
template <class Derived>
using State = typename Base::template State<Derived>;
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
gint paint_offset = (y - roi->y) * this->paint_stride +
(rect->x - roi->x) * 4;
gfloat *paint_pixel = &this->paint_data[paint_offset];
gint mask_offset = (y - roi->y) * this->mask_stride +
(rect->x - roi->x);
const mask_type *mask_pixel = &this->mask_data[mask_offset];
gint x;
for (x = 0; x < rect->width; x++)
{
paint_pixel[3] *= value_to_float (*mask_pixel) * params->paint_opacity;
mask_pixel += 1;
paint_pixel += 4;
}
}
};
static SuppressedAlgorithmDispatch<
PaintMaskToPaintBufAlpha,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_PAINT_BUF_ALPHA,
decltype (dispatch_paint_buf),
decltype (dispatch_paint_mask)
>
dispatch_paint_mask_to_paint_buf_alpha;
/* CanvasBufferToCompMask, dispatch_canvas_buffer_to_comp_mask():
*
* An algorithm class, implementing the CANVAS_BUFFER_TO_COMP_MASK algorithm.
*/
template <class Base,
gboolean Direct>
struct CanvasBufferToCompMask : Base
{
using comp_mask_type = typename Base::comp_mask_type;
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
const gfloat *canvas_pixel;
const gfloat *mask_pixel;
};
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->canvas_pixel =
(const gfloat *) iter->items[state->canvas_buffer_iterator].data;
state->mask_pixel =
(const gfloat *) iter->items[state->mask_buffer_iterator].data;
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
comp_mask_type *comp_mask_pixel = state->comp_mask_data;
gint x;
for (x = 0; x < rect->width; x++)
{
comp_mask_pixel[0] = state->canvas_pixel[0] * state->mask_pixel[0];
comp_mask_pixel += 1;
state->canvas_pixel += 1;
state->mask_pixel += 1;
}
}
};
template <class Base>
struct CanvasBufferToCompMask<Base, TRUE> : Base
{
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
using Base::Base;
template <class Derived>
using State = typename Base::template State<Derived>;
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->comp_mask_data =
(gfloat *) iter->items[state->canvas_buffer_iterator].data - rect->width;
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
state->comp_mask_data += rect->width;
}
};
struct DispatchCanvasBufferToCompMask
{
static constexpr guint mask =
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK;
template <class Base>
using AlgorithmDirect = CanvasBufferToCompMask<Base, TRUE>;
template <class Base>
using AlgorithmIndirect = CanvasBufferToCompMask<Base, FALSE>;
using DispatchDirect = BasicDispatch<
AlgorithmDirect,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK,
decltype (dispatch_comp_mask)
>;
using DispatchIndirect = BasicDispatch<
AlgorithmIndirect,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK,
decltype (dispatch_temp_comp_mask)
>;
template <class Algorithm,
gboolean HasMaskBufferIterator = has_mask_buffer_iterator (
(Algorithm *) NULL)>
struct Dispatch : DispatchIndirect
{
};
template <class Algorithm>
struct Dispatch<Algorithm, FALSE> : DispatchDirect
{
};
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
if ((algorithms & mask) == mask)
{
dispatch (
[&] (auto algorithm)
{
using NewAlgorithm = typename decltype (algorithm)::type;
Dispatch<NewAlgorithm> () (visitor, params, algorithms, algorithm);
},
params, algorithms, algorithm,
DispatchCanvasBufferIterator<GEGL_BUFFER_READ> (),
dispatch_mask_buffer_iterator);
}
else
{
visitor (algorithm);
}
}
} static dispatch_canvas_buffer_to_comp_mask;
/* PaintMaskToCompMask, dispatch_paint_mask_to_comp_mask():
*
* An algorithm class, implementing the PAINT_MASK_TO_COMP_MASK algorithm.
*/
template <class Base,
gboolean Direct>
struct PaintMaskToCompMask : Base
{
using mask_type = typename Base::mask_type;
using comp_mask_type = typename Base::comp_mask_type;
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
using Base::Base;
template <class Derived>
struct State : Base::template State<Derived>
{
const gfloat *mask_pixel;
};
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
if (has_mask_buffer_iterator (this))
{
state->mask_pixel =
(const gfloat *) iter->items[mask_buffer_iterator (this, state)].data;
}
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
gint mask_offset = (y - roi->y) * this->mask_stride +
(rect->x - roi->x);
const mask_type *mask_pixel = &this->mask_data[mask_offset];
comp_mask_type *comp_mask_pixel = state->comp_mask_data;
gint x;
if (has_mask_buffer_iterator (this))
{
for (x = 0; x < rect->width; x++)
{
comp_mask_pixel[0] = value_to_float (mask_pixel[0]) *
state->mask_pixel[0] *
params->paint_opacity;
comp_mask_pixel += 1;
mask_pixel += 1;
state->mask_pixel += 1;
}
}
else
{
for (x = 0; x < rect->width; x++)
{
comp_mask_pixel[0] = value_to_float (mask_pixel[0]) *
params->paint_opacity;
comp_mask_pixel += 1;
mask_pixel += 1;
}
}
}
};
template <class Base>
struct PaintMaskToCompMask<Base, TRUE> : Base
{
using mask_type = typename Base::mask_type;
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK;
using Base::Base;
template <class Derived>
using State = typename Base::template State<Derived>;
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
gint mask_offset = (rect->y - roi->y) * this->mask_stride +
(rect->x - roi->x);
state->comp_mask_data = (mask_type *) &this->mask_data[mask_offset] -
this->mask_stride;
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
state->comp_mask_data += this->mask_stride;
}
};
struct DispatchPaintMaskToCompMask
{
static constexpr guint mask =
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
template <class Base>
using AlgorithmDirect = PaintMaskToCompMask<Base, TRUE>;
template <class Base>
using AlgorithmIndirect = PaintMaskToCompMask<Base, FALSE>;
using DispatchDirect = BasicDispatch<
AlgorithmDirect,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK,
decltype (dispatch_comp_mask)
>;
using DispatchIndirect = BasicDispatch<
AlgorithmIndirect,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK,
decltype (dispatch_temp_comp_mask)
>;
template <class Algorithm,
class MaskType = typename Algorithm::mask_type,
gboolean HasMaskBufferIterator = has_mask_buffer_iterator (
(Algorithm *) NULL)>
struct Dispatch : DispatchIndirect
{
};
template <class Algorithm>
struct Dispatch<Algorithm, gfloat, FALSE> : DispatchDirect
{
};
template <class Visitor,
class Algorithm>
void
operator () (Visitor visitor,
const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms,
identity<Algorithm> algorithm) const
{
if ((algorithms & mask) == mask)
{
dispatch (
[&] (auto algorithm)
{
using NewAlgorithm = typename decltype (algorithm)::type;
if (params->paint_opacity == GIMP_OPACITY_OPAQUE)
Dispatch<NewAlgorithm> () (visitor, params, algorithms, algorithm);
else
DispatchIndirect () (visitor, params, algorithms, algorithm);
},
params, algorithms, algorithm,
dispatch_paint_mask,
dispatch_mask_buffer_iterator);
}
else
{
visitor (algorithm);
}
}
} static dispatch_paint_mask_to_comp_mask;
/* DoLayerBlend, dispatch_do_layer_blend():
*
* An algorithm class, implementing the DO_LAYER_BLEND algorithm.
*/
template <class Base>
struct DoLayerBlend : Base
{
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_DO_LAYER_BLEND;
static constexpr gint max_n_iterators = Base::max_n_iterators + 2;
const Babl *iterator_format;
GimpOperationLayerMode *layer_mode = NULL;
explicit
DoLayerBlend (const GimpPaintCoreLoopsParams *params) :
Base (params)
{
layer_mode = GIMP_OPERATION_LAYER_MODE (gimp_layer_mode_get_operation (params->paint_mode));
layer_mode->opacity = params->image_opacity;
iterator_format = gimp_layer_mode_get_format (params->paint_mode,
layer_mode->blend_space,
layer_mode->composite_space,
layer_mode->composite_mode,
gimp_temp_buf_get_format (params->paint_buf));
g_return_if_fail (gimp_temp_buf_get_format (params->paint_buf) == iterator_format);
}
template <class Derived>
struct State : Base::template State<Derived>
{
gint iterator_base;
GeglRectangle process_roi;
gfloat *out_pixel;
gfloat *in_pixel;
gfloat *mask_pixel;
gfloat *paint_pixel;
};
template <class Derived>
void
init (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area) const
{
state->iterator_base = gegl_buffer_iterator_add (iter, params->src_buffer,
area, 0, iterator_format,
GEGL_ACCESS_READ,
GEGL_ABYSS_NONE);
if (! has_comp_buffer ((const Derived *) this))
{
gegl_buffer_iterator_add (iter, params->dest_buffer, area, 0,
iterator_format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
}
/* initialize the base class *after* initializing the iterator, to make
* sure that src_buffer is the primary buffer of the iterator, if no
* subclass added an iterator first.
*/
Base::init (params, state, iter, roi, area);
}
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->in_pixel = (gfloat *) iter->items[state->iterator_base + 0].data;
state->paint_pixel = this->paint_data +
(rect->y - roi->y) * this->paint_stride +
(rect->x - roi->x) * 4;
if (! has_comp_mask (this) && has_mask_buffer_iterator (this))
{
state->mask_pixel =
(gfloat *) iter->items[mask_buffer_iterator (this, state)].data;
}
if (! has_comp_buffer ((const Derived *) this))
state->out_pixel = (gfloat *) iter->items[state->iterator_base + 1].data;
state->process_roi.x = rect->x;
state->process_roi.width = rect->width;
state->process_roi.height = 1;
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
gfloat *mask_pixel;
gfloat *out_pixel;
if (has_comp_mask (this))
mask_pixel = comp_mask_data (this, state);
else if (has_mask_buffer_iterator (this))
mask_pixel = state->mask_pixel;
else
mask_pixel = NULL;
if (! has_comp_buffer ((const Derived *) this))
{
out_pixel = state->out_pixel;
}
else
{
out_pixel = comp_buffer_data (
(const Derived *) this,
(typename Derived::template State<Derived> *) state);
}
state->process_roi.y = y;
layer_mode->function ((GeglOperation*) layer_mode,
state->in_pixel,
state->paint_pixel,
mask_pixel,
out_pixel,
rect->width,
&state->process_roi,
0);
state->in_pixel += rect->width * 4;
state->paint_pixel += this->paint_stride;
if (! has_comp_mask (this) && has_mask_buffer_iterator (this))
state->mask_pixel += rect->width;
if (! has_comp_buffer ((const Derived *) this))
state->out_pixel += rect->width * 4;
}
};
static MandatoryAlgorithmDispatch<
DoLayerBlend,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_DO_LAYER_BLEND,
decltype (dispatch_paint_buf),
decltype (dispatch_mask_buffer_iterator)
>
dispatch_do_layer_blend;
/* MaskComponents, dispatch_mask_components():
*
* An algorithm class, implementing the MASK_COMPONENTS algorithm.
*/
template <class Base>
struct MaskComponents : Base
{
static constexpr guint filter =
Base::filter |
GIMP_PAINT_CORE_LOOPS_ALGORITHM_MASK_COMPONENTS;
static constexpr gint max_n_iterators = Base::max_n_iterators + 1;
const Babl *format;
const Babl *comp_fish = NULL;
explicit
MaskComponents (const GimpPaintCoreLoopsParams *params) :
Base (params)
{
format = gimp_operation_mask_components_get_format (
gegl_buffer_get_format (params->dest_buffer));
if (format != this->iterator_format)
comp_fish = babl_fish (this->iterator_format, format);
}
template <class Derived>
struct State : Base::template State<Derived>
{
gint dest_buffer_iterator;
guint8 *dest_pixel;
guint8 *comp_pixel;
};
template <class Derived>
void
init (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area) const
{
state->dest_buffer_iterator = gegl_buffer_iterator_add (
iter, params->dest_buffer, area, 0, format,
GEGL_ACCESS_READWRITE, GEGL_ABYSS_NONE);
/* initialize the base class *after* initializing the iterator, to make
* sure that dest_buffer is the primary buffer of the iterator, if no
* subclass added an iterator first.
*/
Base::init (params, state, iter, roi, area);
}
template <class Derived>
void
init_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect) const
{
Base::init_step (params, state, iter, roi, area, rect);
state->dest_pixel =
(guint8 *) iter->items[state->dest_buffer_iterator].data;
if (comp_fish)
{
state->comp_pixel = (guint8 *) gegl_scratch_alloc (
rect->width * babl_format_get_bytes_per_pixel (format));
}
}
template <class Derived>
void
process_row (const GimpPaintCoreLoopsParams *params,
State<Derived> *state,
GeglBufferIterator *iter,
const GeglRectangle *roi,
const GeglRectangle *area,
const GeglRectangle *rect,
gint y) const
{
Base::process_row (params, state, iter, roi, area, rect, y);
gpointer comp_pixel;
if (comp_fish)
{
babl_process (comp_fish,
state->comp_buffer_data, state->comp_pixel,
rect->width);
comp_pixel = state->comp_pixel;
}
else
{
comp_pixel = state->comp_buffer_data;
}
gimp_operation_mask_components_process (format,
state->dest_pixel, comp_pixel,
state->dest_pixel,
rect->width, params->affect);
state->dest_pixel += rect->width * babl_format_get_bytes_per_pixel (format);
}
template <class Derived>
void
finalize_step (const GimpPaintCoreLoopsParams *params,
State<Derived> *state) const
{
if (comp_fish)
gegl_scratch_free (state->comp_pixel);
Base::finalize_step (params, state);
}
};
static AlgorithmDispatch<
MaskComponents,
GIMP_PAINT_CORE_LOOPS_ALGORITHM_MASK_COMPONENTS,
decltype (dispatch_temp_comp_buffer)
>
dispatch_mask_components;
/* gimp_paint_core_loops_process():
*
* Performs the set of algorithms requested in 'algorithms', specified as a
* bitwise-OR of 'GimpPaintCoreLoopsAlgorithm' values, given the set of
* parameters 'params'.
*
* Note that the order in which the algorithms are performed is currently
* fixed, and follows their order of appearance in the
* 'GimpPaintCoreLoopsAlgorithm' enum.
*/
void
gimp_paint_core_loops_process (const GimpPaintCoreLoopsParams *params,
GimpPaintCoreLoopsAlgorithm algorithms)
{
GeglRectangle roi;
if (params->paint_buf)
{
roi.x = params->paint_buf_offset_x;
roi.y = params->paint_buf_offset_y;
roi.width = gimp_temp_buf_get_width (params->paint_buf);
roi.height = gimp_temp_buf_get_height (params->paint_buf);
}
else
{
roi.x = params->paint_buf_offset_x;
roi.y = params->paint_buf_offset_y;
roi.width = gimp_temp_buf_get_width (params->paint_mask) -
params->paint_mask_offset_x;
roi.height = gimp_temp_buf_get_height (params->paint_mask) -
params->paint_mask_offset_y;
}
dispatch (
[&] (auto algorithm_type)
{
using Algorithm = typename decltype (algorithm_type)::type;
using State = typename Algorithm::template State<Algorithm>;
Algorithm algorithm (params);
gegl_parallel_distribute_area (
&roi, PIXELS_PER_THREAD,
[=] (const GeglRectangle *area)
{
State state;
gint y;
if (Algorithm::max_n_iterators > 0)
{
GeglBufferIterator *iter;
iter = gegl_buffer_iterator_empty_new (
Algorithm::max_n_iterators);
algorithm.init (params, &state, iter, &roi, area);
while (gegl_buffer_iterator_next (iter))
{
const GeglRectangle *rect = &iter->items[0].roi;
algorithm.init_step (params, &state, iter, &roi, area, rect);
for (y = 0; y < rect->height; y++)
{
algorithm.process_row (params, &state,
iter, &roi, area, rect,
rect->y + y);
}
algorithm.finalize_step (params, &state);
}
algorithm.finalize (params, &state);
}
else
{
algorithm.init (params, &state, NULL, &roi, area);
algorithm.init_step (params, &state, NULL, &roi, area, area);
for (y = 0; y < area->height; y++)
{
algorithm.process_row (params, &state,
NULL, &roi, area, area,
area->y + y);
}
algorithm.finalize_step (params, &state);
algorithm.finalize (params, &state);
}
});
},
params, algorithms, identity<AlgorithmBase> (),
dispatch_combine_paint_mask_to_canvas_buffer_to_paint_buf_alpha,
dispatch_combine_paint_mask_to_canvas_buffer,
dispatch_canvas_buffer_to_paint_buf_alpha,
dispatch_paint_mask_to_paint_buf_alpha,
dispatch_canvas_buffer_to_comp_mask,
dispatch_paint_mask_to_comp_mask,
dispatch_do_layer_blend,
dispatch_mask_components);
}
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