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/** @file */
#ifndef HITOMEZASHI_HITOMEZASHI_H
#define HITOMEZASHI_HITOMEZASHI_H
#include "SDL2/SDL.h"
/** The state of a hitomezashi pattern.
*/
struct Hitomezashi_State {
int x_pattern_len;
int y_pattern_len;
/** Pattern used to draw the vertical lines conceptually originating from the
* x axis. This is an array of 0s and 1s.
*/
const char *x_pattern;
/** Pattern used to draw the horizontal lines conceptually originating from
* the y axis. This is an array of 0s and 1s.
*/
const char *y_pattern;
/** Gap between parallel lines. */
int gap;
int line_thickness;
Uint32 fg_colour;
Uint32 bg_colour;
/** Width in pixels of the SDL_Surface needed to hold the pattern. This is
* calculated by hitomezashi_state_init(). */
int output_width;
/** Height in pixels of the SDL_Surface needed to hold the pattern. This is
* calculated by hitomezashi_state_init(). */
int output_height;
/** Surface the pattern is drawn to by hitomezashi_draw(). */
SDL_Surface *surface;
};
enum Hitomezashi_State_Init_Result {
Hitomezashi_State_Init_Result_Success,
/** The function failed as it encountered an error initialising the
SDL_Surface in state. */
Hitomezashi_State_Init_Result_Err_Create_Surface,
};
enum Hitomezashi_Draw_Result {
Hitomezashi_Draw_Result_Success,
/** The function failed as it encountered an error "locking" the surface to
write to it. */
Hitomezashi_Draw_Result_Err_Lock_Surface,
};
/** Initialise a Hitomezashi_State struct so that it is ready to be passed to
* hitomezashi_draw(). */
enum Hitomezashi_State_Init_Result
hitomezashi_state_init(struct Hitomezashi_State *state, int x_pattern_len,
int y_pattern_len, const char *x_pattern,
const char *y_pattern, int gap, int line_thickness,
Uint32 fg_colour, Uint32 bg_colour);
/** Draw the hitomezashi pattern to state->surface. */
enum Hitomezashi_Draw_Result hitomezashi_draw(struct Hitomezashi_State *state);
#endif // HITOMEZASHI_HITOMEZASHI_H
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