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/* See LICENSE file for copyright and license details. */
#ifndef LIBSKRIFT_H
#define LIBSKRIFT_H 1
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#if defined(__GNUC__)
# define _LIBSKRIFT_GCC_ONLY(...) __VA_ARGS__
#else
# define _LIBSKRIFT_GCC_ONLY(...)
#endif
#define LIBSKRIFT_RENDERING_STRUCT_VERSION 0
#define LIBSKRIFT_NONE 0
typedef struct libskrift_context LIBSKRIFT_CONTEXT;
typedef struct libskrift_font LIBSKRIFT_FONT;
typedef uint_least32_t libskrift_codepoint_t;
enum libskrift_subpixel_order {
LIBSKRIFT_OTHER, /* LIBSKRIFT_NONE */
LIBSKRIFT_RGB,
LIBSKRIFT_BGR,
LIBSKRIFT_VRGB,
LIBSKRIFT_VBGR
};
enum libskrift_smoothing {
LIBSKRIFT_MONOCHROME, /* LIBSKRIFT_NONE */
LIBSKRIFT_GREYSCALE,
LIBSKRIFT_SUBPIXEL
};
enum libskrift_hinting {
LIBSKRIFT_UNHINTED = 0, /* LIBSKRIFT_NONE */
LIBSKRIFT_SLIGHT = 25,
LIBSKRIFT_MEDIUM = 50,
LIBSKRIFT_FULL = 100
};
enum libskrift_rendering_flags {
LIBSKRIFT_CORRECT_GAMMA = 0x0001,
LIBSKRIFT_REMOVE_GAMMA = 0x0002,
LIBSKRIFT_Y_INCREASES_UPWARDS = 0x0004, /* SFT_DOWNWARD_Y otherwise */
LIBSKRIFT_FLIP_TEXT = 0x0008,
LIBSKRIFT_MIRROR_TEXT = 0x0010,
LIBSKRIFT_MIRROR_CHARS = 0x0020,
LIBSKRIFT_TRANSPOSE_TEXT = 0x0040,
LIBSKRIFT_TRANSPOSE_CHARS = 0x0080,
LIBSKRIFT_NO_LIGATURES = 0x0100,
LIBSKRIFT_ADVANCE_TO_GRID = 0x0200,
LIBSKRIFT_REGRESS_TO_GRID = 0x0400, /* Combine with LIBSKRIFT_ADVANCE_TO_GRID for closest alternative */
LIBSKRIFT_USE_SUBPIXEL_GRID = 0x0800
};
struct libskrift_rendering {
int struct_version;
enum libskrift_subpixel_order subpixel_order;
enum libskrift_smoothing smoothing;
enum libskrift_hinting hinting;
enum libskrift_rendering_flags flags;
double horizontal_dpi;
double vertical_dpi;
double kerning;
double interletter_spacing;
double prestroke_transformation_rotation[4];
double left_transformation[6];
double right_transformation[6];
double top_transformation[6];
double bottom_transformation[6];
double poststroke_transformation_rotation[4];
double char_transformation[6];
double text_transformation[6];
};
struct libskrift_glyph {
double advance;
int16_t x;
int16_t y;
uint16_t width;
uint16_t height;
size_t size;
uint8_t image[];
};
struct libskrift_saved_grapheme {
libskrift_codepoint_t cp;
size_t len;
};
#define LIBSKRIFT_DEFAULT_RENDERING {\
.struct_version = LIBSKRIFT_RENDERING_STRUCT_VERSION,\
.subpixel_order = LIBSKRIFT_NONE,\
.smoothing = LIBSKRIFT_GREYSCALE,\
.hinting = LIBSKRIFT_FULL,\
.flags = 0,\
.horizontal_dpi = (double)1920 * 254 / 5180,\
.vertical_dpi = (double)1200 * 254 / 3240,\
.kerning = 1,\
.interletter_spacing = 0,\
.prestroke_transformation_rotation = {1, 0, 0, 1},\
.left_transformation = {1, 0, 0, 0, 1, 0},\
.right_transformation = {1, 0, 0, 0, 1, 0},\
.top_transformation = {1, 0, 0, 0, 1, 0},\
.bottom_transformation = {1, 0, 0, 0, 1, 0},\
.poststroke_transformation_rotation = {1, 0, 0, 1},\
.char_transformation = {1, 0, 0, 0, 1, 0},\
.text_transformation = {1, 0, 0, 0, 1, 0},\
}
#define LIBSKRIFT_NO_SAVED_GRAPHEME {0, 0}
_LIBSKRIFT_GCC_ONLY(__attribute__((__const__, __warn_unused_result__)))
inline double
libskrift_calculate_dpi(double pixels, double millimeters)
{
return pixels * 254 / 10 / millimeters;
}
_LIBSKRIFT_GCC_ONLY(__attribute__((__const__, __warn_unused_result__)))
inline double
libskrift_inches_to_pixels(double inches, const struct libskrift_rendering *rendering)
{
return inches * rendering->vertical_dpi;
}
_LIBSKRIFT_GCC_ONLY(__attribute__((__const__, __warn_unused_result__)))
inline double
libskrift_millimeters_to_pixels(double millimeters, const struct libskrift_rendering *rendering)
{
return millimeters * 10 / 254 * rendering->vertical_dpi;
}
_LIBSKRIFT_GCC_ONLY(__attribute__((__const__, __warn_unused_result__)))
inline double
libskrift_points_to_pixels(double points, const struct libskrift_rendering *rendering)
{
return points / 72 * rendering->vertical_dpi;
}
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__)))
int libskrift_open_font_file(LIBSKRIFT_FONT **, const char *);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__)))
int libskrift_open_font_mem(LIBSKRIFT_FONT **, const void *, size_t);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__)))
int libskrift_open_font_fd(LIBSKRIFT_FONT **, int);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__)))
int libskrift_open_font(LIBSKRIFT_FONT **, FILE *);
void libskrift_close_font(LIBSKRIFT_FONT *);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__(1, 2))))
int libskrift_create_context(LIBSKRIFT_CONTEXT **, LIBSKRIFT_FONT *, const struct libskrift_rendering *, double);
void libskrift_free_context(LIBSKRIFT_CONTEXT *);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__, __returns_nonnull__, __warn_unused_result__, __const__)))
const struct libskrift_rendering *libskrift_get_rendering_settings(LIBSKRIFT_CONTEXT *);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__)))
int libskrift_get_grapheme_glyph(LIBSKRIFT_CONTEXT *, libskrift_codepoint_t, double, double, struct libskrift_glyph **);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__(1, 2, 6))))
ssize_t libskrift_get_cluster_glyph(LIBSKRIFT_CONTEXT *, const char *, struct libskrift_saved_grapheme *,
double, double, struct libskrift_glyph **);
_LIBSKRIFT_GCC_ONLY(__attribute__((__nonnull__)))
int libskrift_merge_glyphs(LIBSKRIFT_CONTEXT *, struct libskrift_glyph *, struct libskrift_glyph *, struct libskrift_glyph **);
#endif
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