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#ifndef MUPDF_FITZ_SHADE_H
#define MUPDF_FITZ_SHADE_H
#include "mupdf/fitz/system.h"
#include "mupdf/fitz/context.h"
#include "mupdf/fitz/geometry.h"
#include "mupdf/fitz/store.h"
#include "mupdf/fitz/colorspace.h"
#include "mupdf/fitz/pixmap.h"
#include "mupdf/fitz/compressed-buffer.h"
/*
* The shading code uses gouraud shaded triangle meshes.
*/
enum
{
FZ_FUNCTION_BASED = 1,
FZ_LINEAR = 2,
FZ_RADIAL = 3,
FZ_MESH_TYPE4 = 4,
FZ_MESH_TYPE5 = 5,
FZ_MESH_TYPE6 = 6,
FZ_MESH_TYPE7 = 7
};
/*
Structure is public to allow derived classes. Do not
access the members directly.
*/
typedef struct fz_shade_s
{
fz_storable storable;
fz_rect bbox; /* can be fz_infinite_rect */
fz_colorspace *colorspace;
fz_matrix matrix; /* matrix from pattern dict */
int use_background; /* background color for fills but not 'sh' */
float background[FZ_MAX_COLORS];
/* Just to be confusing, PDF Shadings of Type 1 (Function Based
* Shadings), do NOT use_function, but all the others do. This
* is because Type 1 shadings take 2 inputs, whereas all the
* others (when used with a function take 1 input. The type 1
* data is in the 'f' field of the union below. */
int use_function;
float function[256][FZ_MAX_COLORS + 1];
int type; /* function, linear, radial, mesh */
union
{
struct
{
int extend[2];
float coords[2][3]; /* (x,y,r) twice */
} l_or_r;
struct
{
int vprow;
int bpflag;
int bpcoord;
int bpcomp;
float x0, x1;
float y0, y1;
float c0[FZ_MAX_COLORS];
float c1[FZ_MAX_COLORS];
} m;
struct
{
fz_matrix matrix;
int xdivs;
int ydivs;
float domain[2][2];
float *fn_vals;
} f;
} u;
fz_compressed_buffer *buffer;
} fz_shade;
/*
fz_keep_shade: Add a reference to a fz_shade.
shade: The reference to keep.
Returns shade.
*/
fz_shade *fz_keep_shade(fz_context *ctx, fz_shade *shade);
/*
fz_drop_shade: Drop a reference to a fz_shade.
shade: The reference to drop. If this is the last
reference, shade will be destroyed.
*/
void fz_drop_shade(fz_context *ctx, fz_shade *shade);
/*
fz_drop_shade_imp: Internal function to destroy a
shade. Only exposed for use with the fz_store.
shade: The reference to destroy.
*/
void fz_drop_shade_imp(fz_context *ctx, fz_storable *shade);
/*
fz_bound_shade: Bound a given shading.
shade: The shade to bound.
ctm: The transform to apply to the shade before bounding.
r: Pointer to storage to put the bounds in.
Returns r, updated to contain the bounds for the shading.
*/
fz_rect fz_bound_shade(fz_context *ctx, fz_shade *shade, fz_matrix ctm);
/*
fz_paint_shade: Render a shade to a given pixmap.
shade: The shade to paint.
override_cs: NULL, or colorspace to override the shades
inbuilt colorspace.
ctm: The transform to apply.
dest: The pixmap to render into.
color_params: The color rendering settings
bbox: Pointer to a bounding box to limit the rendering
of the shade.
op: NULL, or pointer to overprint bitmap.
*/
void fz_paint_shade(fz_context *ctx, fz_shade *shade, fz_colorspace *override_cs, fz_matrix ctm, fz_pixmap *dest, const fz_color_params *color_params, fz_irect bbox, const fz_overprint *eop);
/*
* Handy routine for processing mesh based shades
*/
typedef struct fz_vertex_s fz_vertex;
struct fz_vertex_s
{
fz_point p;
float c[FZ_MAX_COLORS];
};
/*
fz_shade_prepare_fn: Callback function type for use with
fz_process_shade.
arg: Opaque pointer from fz_process_shade caller.
v: Pointer to a fz_vertex structure to populate.
c: Pointer to an array of floats used to populate v.
*/
typedef void (fz_shade_prepare_fn)(fz_context *ctx, void *arg, fz_vertex *v, const float *c);
/*
fz_shade_process_fn: Callback function type for use with
fz_process_shade.
arg: Opaque pointer from fz_process_shade caller.
av, bv, cv: Pointers to a fz_vertex structure describing
the corner locations and colors of a triangle to be
filled.
*/
typedef void (fz_shade_process_fn)(fz_context *ctx, void *arg, fz_vertex *av, fz_vertex *bv, fz_vertex *cv);
/*
fz_process_shade: Process a shade, using supplied callback
functions. This decomposes the shading to a mesh (even ones
that are not natively meshes, such as linear or radial
shadings), and processes triangles from those meshes.
shade: The shade to process.
ctm: The transform to use
prepare: Callback function to 'prepare' each vertex.
This function is passed an array of floats, and populates
a fz_vertex structure.
process: This function is passed 3 pointers to vertex
structures, and actually performs the processing (typically
filling the area between the vertexes).
process_arg: An opaque argument passed through from caller
to callback functions.
*/
void fz_process_shade(fz_context *ctx, fz_shade *shade, fz_matrix ctm,
fz_shade_prepare_fn *prepare,
fz_shade_process_fn *process,
void *process_arg);
#endif
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