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#ifndef MUPDF_FITZ_BITMAP_H
#define MUPDF_FITZ_BITMAP_H
#include "mupdf/fitz/system.h"
#include "mupdf/fitz/context.h"
#include "mupdf/fitz/pixmap.h"
/*
Bitmaps have 1 bit per component. Only used for creating halftoned
versions of contone buffers, and saving out. Samples are stored msb
first, akin to pbms.
*/
typedef struct fz_bitmap_s fz_bitmap;
/*
fz_keep_bitmap: Take a reference to a bitmap.
bit: The bitmap to increment the reference for.
Returns bit.
*/
fz_bitmap *fz_keep_bitmap(fz_context *ctx, fz_bitmap *bit);
/*
fz_drop_bitmap: Drop a reference and free a bitmap.
Decrement the reference count for the bitmap. When no
references remain the pixmap will be freed.
*/
void fz_drop_bitmap(fz_context *ctx, fz_bitmap *bit);
/*
A halftone is a set of threshold tiles, one per component. Each
threshold tile is a pixmap, possibly of varying sizes and phases.
Currently, we only provide one 'default' halftone tile for operating
on 1 component plus alpha pixmaps (where the alpha is ignored). This
is signified by a fz_halftone pointer to NULL.
*/
typedef struct fz_halftone_s fz_halftone;
/*
fz_new_bitmap_from_pixmap: Make a bitmap from a pixmap and a halftone.
pix: The pixmap to generate from. Currently must be a single color
component with no alpha.
ht: The halftone to use. NULL implies the default halftone.
Returns the resultant bitmap. Throws exceptions in the case of
failure to allocate.
*/
fz_bitmap *fz_new_bitmap_from_pixmap(fz_context *ctx, fz_pixmap *pix, fz_halftone *ht);
/*
fz_new_bitmap_from_pixmap_band: Make a bitmap from a pixmap and a
halftone, allowing for the position of the pixmap within an
overall banded rendering.
pix: The pixmap to generate from. Currently must be a single color
component with no alpha.
ht: The halftone to use. NULL implies the default halftone.
band_start: Vertical offset within the overall banded rendering
(in pixels)
Returns the resultant bitmap. Throws exceptions in the case of
failure to allocate.
*/
fz_bitmap *fz_new_bitmap_from_pixmap_band(fz_context *ctx, fz_pixmap *pix, fz_halftone *ht, int band_start);
struct fz_bitmap_s
{
int refs;
int w, h, stride, n;
int xres, yres;
unsigned char *samples;
};
/*
fz_new_bitmap: Create a new bitmap.
w, h: Width and Height for the bitmap
n: Number of color components (assumed to be a divisor of 8)
xres, yres: X and Y resolutions (in pixels per inch).
Returns pointer to created bitmap structure. The bitmap
data is uninitialised.
*/
fz_bitmap *fz_new_bitmap(fz_context *ctx, int w, int h, int n, int xres, int yres);
/*
fz_bitmap_details: Retrieve details of a given bitmap.
bitmap: The bitmap to query.
w: Pointer to storage to retrieve width (or NULL).
h: Pointer to storage to retrieve height (or NULL).
n: Pointer to storage to retrieve number of color components (or NULL).
stride: Pointer to storage to retrieve bitmap stride (or NULL).
*/
void fz_bitmap_details(fz_bitmap *bitmap, int *w, int *h, int *n, int *stride);
/*
fz_clear_bitmap: Clear a previously created bitmap.
bit: The bitmap to clear.
*/
void fz_clear_bitmap(fz_context *ctx, fz_bitmap *bit);
/*
fz_default_halftone: Create a 'default' halftone structure
for the given number of components.
num_comps: The number of components to use.
Returns a simple default halftone. The default halftone uses
the same halftone tile for each plane, which may not be ideal
for all purposes.
*/
fz_halftone *fz_default_halftone(fz_context *ctx, int num_comps);
/*
fz_keep_halftone: Take an additional reference to a
halftone.
*/
fz_halftone *fz_keep_halftone(fz_context *ctx, fz_halftone *half);
/*
fz_drop_halftone: Drop a reference to a halftone. If the
reference count reaches zero, ht will be destroyed.
*/
void fz_drop_halftone(fz_context *ctx, fz_halftone *ht);
#endif
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