#define MAXCHANNELS 4
+/*
+=item im_context_t
+=category Data Types
+
+Imager's per-thread context.
+
+=cut
+*/
+
typedef struct im_context_tag *im_context_t;
+/*
+=item im_slot_t
+=category Data Types
+
+Represents a slot in the context object.
+
+=cut
+*/
+
typedef ptrdiff_t im_slot_t;
typedef void (*im_slot_destroy_t)(void *);
*/
typedef ptrdiff_t i_img_dim;
+
+/*
+=item i_img_dim_u
+=category Data Types
+=synopsis i_img_dim_u limit;
+=order 90
+
+An unsigned variant of L</i_img_dim>.
+
+=cut
+*/
+
typedef size_t i_img_dim_u;
#define i_img_dim_MAX ((i_img_dim)(~(i_img_dim_u)0 >> 1))
BOUNDING_BOX_COUNT
};
+/*
+=item i_polygon_t
+=category Data Types
+
+Represents a polygon. Has the following members:
+
+=over
+
+=item *
+
+C<x>, C<y> - arrays of x and y locations of vertices.
+
+=item *
+
+C<count> - the number of entries in the C<x> and C<y> arrays.
+
+=back
+
+=cut
+*/
+
typedef struct i_polygon_tag {
const double *x;
const double *y;
size_t count;
} i_polygon_t;
+/*
+=item i_poly_fill_mode_t
+=category Data Types
+
+Control how polygons are filled. Has the following values:
+
+=over
+
+=item *
+
+C<i_pfm_evenodd> - simple even-odd fills.
+
+=item *
+
+C<i_pfm_nonzero> - non-zero winding rule fills.
+
+=back
+
+=cut
+*/
+
typedef enum i_poly_fill_mode_tag {
i_pfm_evenodd,
i_pfm_nonzero
#endif
+/*
+=item i_transp
+=category Data Types
+
+An enumerated type for controlling how transparency is handled during
+quantization.
+
+This has the following possible values:
+
+=over
+
+=item *
+
+C<tr_none> - ignore the alpha channel
+
+=item *
+
+C<tr_threshold> - simple transparency thresholding.
+
+=item *
+
+C<tr_errdiff> - use error diffusion to control which pixels are
+transparent.
+
+=item *
+
+C<tr_ordered> - use ordered dithering to control which pixels are
+transparent.
+
+=back
+
+=cut
+*/
+
/* transparency handling for quantized output */
typedef enum i_transp_tag {
tr_none, /* ignore any alpha channel */
tr_ordered /* an ordered dither */
} i_transp;
-/* controls how we build the colour map */
+/*
+=item i_make_colors
+=category Data Types
+
+An enumerated type used to control the method used for produce the
+color map:
+
+=over
+
+=item *
+
+C<mc_none> - the user supplied map is used.
+
+=item *
+
+C<mc_web_map> - use the classic web map. Any existing fixed colors
+are ignored.
+
+=item *
+
+C<mc_median_cut> - use median cut
+
+=item *
+
+C<mono> - use a fixed black and white map.
+
+=item *
+
+C<gray> - 256 step gray map.
+
+=item *
+
+C<gray4> - 4 step gray map.
+
+=item *
+
+C<gray16> - 16 step gray map.
+
+=back
+
+=cut
+*/
+
typedef enum i_make_colors_tag {
mc_none, /* user supplied colour map only */
mc_web_map, /* Use the 216 colour web colour map */
mc_mask = 0xFF /* (mask for generator) */
} i_make_colors;
+/*
+=item i_translate
+=category Data Types
+
+An enumerated type that controls how colors are translated:
+
+=over
+
+=item *
+
+C<pt_giflib> - obsolete, forces C<make_colors> to use median cut and
+acts like C<pt_closest>.
+
+=item *
+
+C<pt_closest> - always use the closest color.
+
+=item *
+
+C<pt_perturb> - add random values to each sample and find the closest
+color.
+
+=item *
+
+C<pt_errdiff> - error diffusion dither.
+
+=back
+
+=cut
+*/
+
/* controls how we translate the colours */
typedef enum i_translate_tag {
pt_giflib, /* get gif lib to do it (ignores make_colours) */
pt_errdiff /* error diffusion dither - uses errdiff */
} i_translate;
+/*
+=item i_errdiff
+=category Data Types
+
+Controls the type of error diffusion to use:
+
+=over
+
+=item *
+
+C<ed_floyd> - floyd-steinberg
+
+=item *
+
+C<ed_jarvis> - Jarvis, Judice and Ninke
+
+=item *
+
+C<ed_stucki> - Stucki
+
+=item *
+
+C<ed_custom> - not usable for transparency dithering, allows a custom
+error diffusion map to be used.
+
+=item *
+
+C<ed_bidir> - or with the error diffusion type to use alternate
+directions on each line of the dither.
+
+=back
+
+=cut
+*/
+
/* Which error diffusion map to use */
typedef enum i_errdiff_tag {
ed_floyd, /* floyd-steinberg */
ed_bidir = 0x100 /* change direction for each row */
} i_errdiff;
-/* which ordered dither map to use
- currently only available for transparency
+/*
+=item i_ord_dith
+=category Data Types
+
+Which ordered dither map to use, currently only available for
+transparency. Values are:
+
+=over
+
+=item *
+
+C<od_random> - a pre-generated random map.
+
+=item *
+
+C<od_dot8> - large dot dither.
+
+=item *
+
+C<od_dot4> - smaller dot dither
+
+=item *
+
+C<od_hline> - horizontal line dither.
+
+=item *
+
+C<od_vline> - vertical line dither.
+
+=item *
+
+C<od_slashline> - C</> line dither.
+
+=item *
+
+C<od_backline> - C<\> line dither.
+
+=item *
+
+C<od_tiny> - small checkbox dither
+
+=item *
+
+C<od_custom> - custom dither map.
+
+=back
+
+=cut
+
I don't know of a way to do ordered dither of an image against some
general palette
*/
od_custom /* custom 8x8 map */
} i_ord_dith;
-/* passed into i_writegif_gen() to control quantization */
+/*
+=item i_quantize
+=category Data Types
+
+A structure type used to supply image quantization, ie. when
+converting a direct color image to a paletted image.
+
+This has the following members:
+
+=over
+
+=item *
+
+C<transp> - how to handle transparency, see L</i_transp>.
+
+=item *
+
+C<threshold> - when C<transp> is C<tr_threshold>, this is the alpha
+level at which pixels become transparent.
+
+=item *
+
+C<tr_errdiff> - when C<transp> is C<tr_errdiff> this controls the type
+of error diffusion to be done. This may not be C<ed_custom> for this
+member.
+
+=item *
+
+C<tr_orddith> - when C<transp> is C<tr_ordered> this controls the
+patten used for dithering transparency.
+
+=item *
+
+C<tr_custom> - when C<tr_orddith> is C<tr_custom> this is the ordered
+dither mask.
+
+=item *
+
+C<make_colors> - the method used to generate the color palette, see
+L</i_make_colors>.
+
+=item *
+
+C<mc_colors> - an array of C<mc_size> L</i_color> entries used to
+define the fixed colors (controlled by C<mc_count> and to return the
+generated color list.
+
+=item *
+
+C<mc_size> - the size of the buffer allocated to C<mc_colors> in
+C<sizeof(i_color)> units.
+
+=item *
+
+C<mc_count> - the number of initialized colors in C<mc_colors>.
+
+=item *
+
+C<translate> - how RGB colors are translated to palette indexes, see
+L</i_translate>.
+
+=item *
+
+C<errdiff> - when C<translate> is C<pt_errdiff> this controls the type
+of error diffusion to be done.
+
+=item *
+
+C<ed_map>, C<ed_width>, C<ed_height>, C<ed_orig> - when C<errdiff> is
+C<ed_custom> this controls the error diffusion map. C<ed_map> is an
+array of C<ed_width * ed_height> integers. C<ed_orig> is the position
+of the current pixel in the error diffusion map, always on the top
+row.
+
+=item *
+
+C<perturb> - the amount to perturb pixels when C<translate> is
+C<mc_perturb>.
+
+=back
+
+=cut
+*/
typedef struct i_quantize_tag {
int version;
typedef struct i_render_tag i_render;
+/*
+=item i_color_model_t
+=category Data Types
+=order 95
+
+Returned by L</i_img_color_model(im)> to indicate the color model of
+the image.
+
+An enumerated type with the following possible values:
+
+=over
+
+=item *
+
+C<icm_unknown> - the image has no usable color data. In future
+versions of Imager this will be returned in a few limited cases,
+eg. when the source image is CMYK and the user has requested no color
+translation is done.
+
+=item *
+
+C<icm_gray> - gray scale with no alpha channel.
+
+=item *
+
+C<icm_gray_alpha> - gray scale with an alpha channel.
+
+=item *
+
+C<icm_rgb> - RGB
+
+=item *
+
+C<icm_rgb_alpha> - RGB with an alpha channel.
+
+=back
+
+=cut
+*/
+
+typedef enum {
+ icm_unknown,
+ icm_gray,
+ icm_gray_alpha,
+ icm_rgb,
+ icm_rgb_alpha
+} i_color_model_t;
+
#ifdef IMAGER_FORMAT_ATTR
#define I_FORMAT_ATTR(format_index, va_index) \
__attribute ((format (printf, format_index, va_index)))
projects / imager.git / blobdiff