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tuxpaint-pencil-sharpener/magic/src/fretwork.c
Bill Kendrick dfba73d327 Address some compile-time warnings in SDL 2.0 
Also disable VERBOSE DEBUG output.

Note - Still a pair of nasty warnings about the following

 * ‘rsvg_handle_close’ is deprecated: Use
   'rsvg_handle_read_stream_sync' instead

 * passing argument 3 of ‘autoscale_copy_smear_free’ from incompatible
   pointer type (SDL_BlitSurface)

They should be addressed.
2022-05-19 00:49:48 -07:00

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/*
* Draws fretwork
*
* Last updated: 2022-05-19
*/
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
#include <stdbool.h>
#define SEG_NONE 0
#define SEG_LEFT 1
#define SEG_RIGHT 2
#define SEG_TOP 4
#define SEG_BOTTOM 8
#define SEG_LEFT_RIGHT (SEG_LEFT | SEG_RIGHT)
#define SEG_TOP_BOTTOM (SEG_TOP | SEG_BOTTOM)
#define SEG_RIGHT_TOP (SEG_RIGHT | SEG_TOP)
#define SEG_RIGHT_BOTTOM (SEG_RIGHT | SEG_BOTTOM)
#define SEG_LEFT_TOP (SEG_LEFT | SEG_TOP)
#define SEG_LEFT_BOTTOM (SEG_LEFT | SEG_BOTTOM)
#define SEG_LEFT_RIGHT_TOP (SEG_LEFT | SEG_RIGHT | SEG_TOP)
#define SEG_LEFT_RIGHT_BOTTOM (SEG_LEFT | SEG_RIGHT | SEG_BOTTOM)
#define SEG_LEFT_TOP_BOTTOM (SEG_LEFT | SEG_TOP | SEG_BOTTOM)
#define SEG_RIGHT_TOP_BOTTOM (SEG_RIGHT | SEG_TOP | SEG_BOTTOM)
#define SEG_LEFT_RIGHT_TOP_BOTTOM (SEG_LEFT | SEG_RIGHT | SEG_TOP | SEG_BOTTOM)
#ifdef __ANDROID__
#define inline static
#endif
Mix_Chunk *fretwork_snd;
unsigned int img_w, img_h;
unsigned int fretwork_segments_x, fretwork_segments_y; //how many segments do we have?
inline int fretwork_math_ceil(int x, int y); //ceil() in cstdlib returns float and is relative slow, so we'll use our one
static Uint8 *fretwork_status_of_segments; //a place to store an info about bitmap used for selected segment
static char **fretwork_images; //the pathes to all the images needed
static unsigned int fretwork_segment_modified; //which segment was modified this time?
static unsigned int fretwork_segment_modified_last = 0; //which segment was last modified
static unsigned int fretwork_segment_to_add = 0; //a segment that should be added to solve corner joint
static unsigned int fretwork_segment_last_clicked;
static Uint8 fretwork_r, fretwork_g, fretwork_b;
static unsigned int fretwork_full_runs; //The count of the clicks in full mode
static unsigned int fretwork_segment_start_rectangle; //the segment were the update_rectangle will start
static unsigned int fretwork_update_rectangle_width; //the width of the update_rectangle
static unsigned int fretwork_update_rectangle_height; //the height of the update_rectangle
static SDL_Rect modification_rect;
static SDL_Surface *canvas_backup;
static SDL_Surface *fretwork_one_back, *fretwork_three_back, *fretwork_four_back, *fretwork_corner_back;
// Housekeeping functions
Uint32 fretwork_api_version(void);
int fretwork_modes(magic_api * api, int which);
void fretwork_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
static void fretwork_colorize(magic_api * api, SDL_Surface * dest, SDL_Surface * src);
int fretwork_init(magic_api * api);
int fretwork_get_tool_count(magic_api * api);
SDL_Surface *fretwork_get_icon(magic_api * api, int which);
char *fretwork_get_name(magic_api * api, int which);
int fretwork_get_group(magic_api * api, int which);
char *fretwork_get_description(magic_api * api, int which, int mode);
int fretwork_requires_colors(magic_api * api, int which);
void fretwork_release(magic_api * api, int which,
SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
void fretwork_shutdown(magic_api * api);
void fretwork_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas, SDL_Surface * snapshot);
void fretwork_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas, SDL_Surface * snapshot);
inline void fretwork_extract_coords_from_segment(unsigned int segment, int * x, int * y);
void fretwork_click(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
void fretwork_drag(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect);
static void fretwork_draw_wrapper(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y);
inline unsigned int fretwork_get_segment(int x, int y);
SDL_Surface *fretwork_one, *fretwork_three, *fretwork_four, *fretwork_corner;
Uint32 fretwork_api_version(void)
{
return (TP_MAGIC_API_VERSION);
}
int fretwork_modes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return (MODE_PAINT | MODE_FULLSCREEN);
}
void fretwork_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
{
fretwork_r = r;
fretwork_g = g;
fretwork_b = b;
fretwork_colorize(api, fretwork_one, fretwork_one_back);
fretwork_colorize(api, fretwork_three, fretwork_three_back);
fretwork_colorize(api, fretwork_four, fretwork_four_back);
fretwork_colorize(api, fretwork_corner, fretwork_corner_back);
}
/* Adapted from flower.c */
static void fretwork_colorize(magic_api * api, SDL_Surface * dest, SDL_Surface * src)
{
int x, y;
Uint8 r, g, b, a;
SDL_LockSurface(src);
SDL_LockSurface(dest);
for (y = 0; y < src->h; y++)
{
for (x = 0; x < src->w; x++)
{
SDL_GetRGBA(api->getpixel(src, x, y), src->format, &r, &g, &b, &a);
api->putpixel(dest, x, y, SDL_MapRGBA(dest->format, fretwork_r, fretwork_g, fretwork_b, a));
}
}
SDL_UnlockSurface(src);
SDL_UnlockSurface(dest);
}
int fretwork_init(magic_api * api)
{
char fname[1024];
Uint8 i; //is always < 4, so Uint8 seems to be a good idea
fretwork_images = (char **)malloc(sizeof(char *) * 4);
for (i = 0; i < 4; i++)
fretwork_images[i] = (char *)malloc(sizeof(char) * 1024);
snprintf(fretwork_images[0], 1024 * sizeof(char), "%simages/magic/fretwork_one.png", api->data_directory);
snprintf(fretwork_images[1], 1024 * sizeof(char), "%simages/magic/fretwork_three.png", api->data_directory);
snprintf(fretwork_images[2], 1024 * sizeof(char), "%simages/magic/fretwork_four.png", api->data_directory);
snprintf(fretwork_images[3], 1024 * sizeof(char), "%simages/magic/fretwork_corner.png", api->data_directory);
fretwork_one = IMG_Load(fretwork_images[0]);
fretwork_three = IMG_Load(fretwork_images[1]);
fretwork_four = IMG_Load(fretwork_images[2]);
fretwork_corner = IMG_Load(fretwork_images[3]);
fretwork_one_back = IMG_Load(fretwork_images[0]);
fretwork_three_back = IMG_Load(fretwork_images[1]);
fretwork_four_back = IMG_Load(fretwork_images[2]);
fretwork_corner_back = IMG_Load(fretwork_images[3]);
img_w = fretwork_one->w;
img_h = fretwork_one->h;
snprintf(fname, sizeof(fname), "%ssounds/magic/fretwork.ogg", api->data_directory);
fretwork_snd = Mix_LoadWAV(fname);
return (1);
}
int fretwork_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
return 1;
}
SDL_Surface *fretwork_get_icon(magic_api * api, int which ATTRIBUTE_UNUSED)
{
char fname[1024];
snprintf(fname, sizeof(fname), "%simages/magic/fretwork.png", api->data_directory);
return (IMG_Load(fname));
}
int fretwork_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return MAGIC_TYPE_PAINTING;
}
char *fretwork_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return strdup(gettext_noop("Fretwork"));
}
char *fretwork_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode)
{
if (mode == MODE_PAINT)
return strdup(gettext_noop("Click and drag to draw repetitive patterns."));
else
return strdup(gettext_noop("Click to surround your picture with repetitive patterns."));
}
int fretwork_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return 1;
}
void fretwork_release(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * snapshot ATTRIBUTE_UNUSED,
int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
{
}
void fretwork_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
Uint8 i;
if (fretwork_snd != NULL)
Mix_FreeChunk(fretwork_snd);
SDL_FreeSurface(fretwork_one);
SDL_FreeSurface(fretwork_three);
SDL_FreeSurface(fretwork_four);
SDL_FreeSurface(fretwork_corner);
SDL_FreeSurface(fretwork_one_back);
SDL_FreeSurface(fretwork_three_back);
SDL_FreeSurface(fretwork_four_back);
SDL_FreeSurface(fretwork_corner_back);
SDL_FreeSurface(canvas_backup);
for (i = 0; i < 4; i++)
free(fretwork_images[i]);
free(fretwork_images);
if (fretwork_status_of_segments != NULL)
free(fretwork_status_of_segments);
}
void fretwork_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas, SDL_Surface * snapshot ATTRIBUTE_UNUSED)
{
//we've to compute the quantity of segments in each direction
canvas_backup = SDL_CreateRGBSurface(SDL_SWSURFACE, canvas->w, canvas->h, canvas->format->BitsPerPixel,
canvas->format->Rmask, canvas->format->Gmask, canvas->format->Bmask,
canvas->format->Amask);
SDL_BlitSurface(canvas, NULL, canvas_backup, NULL);
fretwork_segments_x = fretwork_math_ceil(canvas->w, img_w);
fretwork_segments_y = fretwork_math_ceil(canvas->h, img_h);
fretwork_status_of_segments = (Uint8 *) calloc(fretwork_segments_x * fretwork_segments_y + 1, sizeof(Uint8)); //segments starts at 1, while fretwork_status_of_segments[] starts at 0
fretwork_full_runs = 1;
}
void fretwork_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * snapshot ATTRIBUTE_UNUSED)
{
free(fretwork_status_of_segments);
fretwork_status_of_segments = NULL;
}
// Interactivity functions
inline int fretwork_math_ceil(int x, int y)
{
int temp;
temp = (int)x / y;
if (x % y)
return temp + 1;
else
return temp;
}
inline unsigned int fretwork_get_segment(int x, int y)
{
int xx; //segments are numerated just like pixels
int yy; //in computer graphics: left upper (=1), ... ,right upper,
//left bottom, ... , right bottom
xx = fretwork_math_ceil(x, img_w);
yy = fretwork_math_ceil(y, img_h);
return (yy - 1) * fretwork_segments_x + xx;
}
inline void fretwork_extract_coords_from_segment(unsigned int segment, int * x, int * y)
{
*x = ((segment % fretwork_segments_x) - 1) * img_w; //useful to set update_rect as small as possible
*y = (int)(segment / fretwork_segments_x) * img_h;
}
/* static void fretwork_flip(void * ptr, SDL_Surface * dest, SDL_Surface * src) */
/* { */
/* magic_api * api = (magic_api *) ptr; */
/* Sint16 x, y; */
/* for (x=0; x<dest->w; x++) */
/* for (y=0; y<dest->h; y++) */
/* api->putpixel(dest, x, y, api->getpixel(src, x, src->h-y)); */
/* } */
static void fretwork_flip_flop(void *ptr, SDL_Surface * dest, SDL_Surface * src)
{
magic_api *api = (magic_api *) ptr;
Sint16 x, y;
for (x = 0; x < dest->w; x++)
for (y = 0; y < dest->h; y++)
api->putpixel(dest, dest->w - 1 - x, dest->h - 1 - y, api->getpixel(src, x, y));
}
static void fretwork_rotate(void *ptr, SDL_Surface * dest, SDL_Surface * src, _Bool direction)
//src and dest must have same size
{
magic_api *api = (magic_api *) ptr;
Sint16 x, y;
if (direction) //rotate -90 degs
{
for (x = 0; x < dest->w; x++)
for (y = 0; y < dest->h; y++)
api->putpixel(dest, x, y, api->getpixel(src, y, src->h - 1 - x));
}
else //rotate +90 degs
{
for (x = 0; x < dest->w; x++)
for (y = 0; y < dest->h; y++)
api->putpixel(dest, x, y, api->getpixel(src, src->h - y - 1, x));
}
}
void fretwork_click(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect)
{
int left_x, right_x, top_y, bottom_y;
fretwork_segment_modified_last = 0;
if (mode == MODE_PAINT)
{
fretwork_segment_last_clicked = fretwork_get_segment(x, y);
fretwork_drag(api, which, canvas, snapshot, x, y, x, y, update_rect);
}
else
{
if (fretwork_full_runs <= min(fretwork_segments_x, fretwork_segments_y) / 2)
{
left_x = img_w * fretwork_full_runs;
right_x = img_w * fretwork_segments_x - img_w * fretwork_full_runs;
top_y = img_h * fretwork_full_runs;
bottom_y = img_h * fretwork_segments_y - img_h * (fretwork_full_runs - 1);
//left line
api->line((void *)api, which, canvas, snapshot, left_x, top_y, left_x, bottom_y, img_w / 2,
fretwork_draw_wrapper);
//top line
api->line((void *)api, which, canvas, snapshot, left_x, top_y, right_x, top_y, img_w / 2,
fretwork_draw_wrapper);
//bottom line
api->line((void *)api, which, canvas, snapshot, left_x, bottom_y, right_x, bottom_y, img_w / 2,
fretwork_draw_wrapper);
//right line
api->line((void *)api, which, canvas, snapshot, right_x, top_y, right_x, bottom_y, img_w / 2,
fretwork_draw_wrapper);
fretwork_full_runs += 1;
update_rect->x = 0;
update_rect->y = 0;
update_rect->w = canvas->w;
update_rect->h = canvas->h;
}
}
}
static Uint8 fretwork_select_image(Uint16 segment)
{
int take_up, take_down;
int val_up, val_down, val_left, val_right;
int from_top = 0, from_bottom = 0, from_left = 0, from_right = 0;
int from_top_right = 0, from_top_left = 0, from_bottom_right = 0, from_bottom_left = 0;
int TOP = 0, BOTTOM = 0, LEFT = 0, RIGHT = 0;
//Checking from were we come...
if (fretwork_segment_modified_last > 0)
{
if (segment == fretwork_segment_modified_last + 1)
from_left = 1;
else if (segment == fretwork_segment_modified_last - 1)
from_right = 1;
else if (segment == fretwork_segment_modified_last - fretwork_segments_x)
from_bottom = 1;
else if (segment == fretwork_segment_modified_last + fretwork_segments_x)
from_top = 1;
// Very very few cases will reach this, segments are joining by the corner
// We need to add a new segment to join by side, adding clockwise
else if (segment == fretwork_segment_modified_last + fretwork_segments_x + 1)
{
from_top_left = 1;
fretwork_segment_to_add = segment - fretwork_segments_x;
}
else if (segment == fretwork_segment_modified_last + fretwork_segments_x - 1)
{
from_top_right = 1;
fretwork_segment_to_add = segment + 1;
}
else if (segment == fretwork_segment_modified_last - fretwork_segments_x - 1)
{
from_bottom_right = 1;
fretwork_segment_to_add = segment + fretwork_segments_x;
}
else if (segment == fretwork_segment_modified_last - fretwork_segments_x + 1)
{
from_bottom_left = 1;
fretwork_segment_to_add = segment - 1;
}
}
take_up = segment - fretwork_segments_x;
if (take_up <= 0)
val_up = SEG_NONE;
else
val_up = fretwork_status_of_segments[take_up];
take_down = segment + fretwork_segments_x;
if (take_down > (signed)(fretwork_segments_x * fretwork_segments_y))
val_down = SEG_NONE;
else
val_down = fretwork_status_of_segments[take_down];
if ((segment % fretwork_segments_x) == 1)
val_left = SEG_NONE;
else
val_left = fretwork_status_of_segments[segment - 1];
if ((segment % fretwork_segments_x) == 0)
val_right = SEG_NONE;
else
val_right = fretwork_status_of_segments[segment + 1];
if (from_left || (val_left & SEG_RIGHT) || from_bottom_left)
{
LEFT = 1;
}
if (from_right || (val_right & SEG_LEFT) || from_top_right)
RIGHT = 1;
if (from_top || (val_up & SEG_BOTTOM) || from_top_left)
TOP = 1;
if (from_bottom || (val_down & SEG_TOP) || from_bottom_right)
BOTTOM = 1;
if (TOP && BOTTOM && LEFT && RIGHT)
return SEG_LEFT_RIGHT_TOP_BOTTOM;
if (LEFT && RIGHT && TOP)
return SEG_LEFT_RIGHT_TOP;
if (LEFT && RIGHT && BOTTOM)
return SEG_LEFT_RIGHT_BOTTOM;
if (TOP && BOTTOM && LEFT)
return SEG_LEFT_TOP_BOTTOM;
if (TOP && BOTTOM && RIGHT)
return SEG_RIGHT_TOP_BOTTOM;
if (LEFT && RIGHT)
return SEG_LEFT_RIGHT;
if (TOP && BOTTOM)
return SEG_TOP_BOTTOM;
if (LEFT && TOP)
return SEG_LEFT_TOP;
if (LEFT && BOTTOM)
return SEG_LEFT_BOTTOM;
if (RIGHT && TOP)
return SEG_RIGHT_TOP;
if (RIGHT && BOTTOM)
return SEG_RIGHT_BOTTOM;
if (LEFT | RIGHT)
return SEG_LEFT_RIGHT;
//if (TOP||BOTTOM)
return SEG_TOP_BOTTOM;
}
static void fretwork_draw(void *ptr, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas,
SDL_Surface * last ATTRIBUTE_UNUSED, int x, int y ATTRIBUTE_UNUSED, unsigned int segment)
{
magic_api *api = (magic_api *) ptr;
SDL_Surface *result, *temp;
Uint8 image;
_Bool use_temp;
use_temp = 0;
if ((segment < 1) | (segment > fretwork_segments_x * fretwork_segments_y))
return;
fretwork_extract_coords_from_segment(segment, &modification_rect.x, &modification_rect.y);
modification_rect.h = img_w;
modification_rect.w = img_h;
image = fretwork_select_image(segment); //select the image to display
if (fretwork_status_of_segments[segment] == image)
return;
fretwork_status_of_segments[segment] = image; //and write it to global table
result = SDL_CreateRGBSurface(SDL_SWSURFACE, img_w, img_h, fretwork_one->format->BitsPerPixel,
fretwork_one->format->Rmask, fretwork_one->format->Gmask, fretwork_one->format->Bmask,
fretwork_one->format->Amask);
temp = SDL_CreateRGBSurface(SDL_SWSURFACE, img_w, img_h, fretwork_one->format->BitsPerPixel,
fretwork_one->format->Rmask, fretwork_one->format->Gmask, fretwork_one->format->Bmask,
fretwork_one->format->Amask);
SDL_BlitSurface(canvas_backup, &modification_rect, result, NULL);
switch (image)
{
case 0:
case SEG_TOP_BOTTOM:
SDL_BlitSurface(canvas_backup, &modification_rect, result, NULL);
SDL_BlitSurface(fretwork_one, NULL, result, NULL);
break;
case SEG_LEFT_RIGHT:
SDL_BlitSurface(canvas_backup, &modification_rect, result, NULL);
fretwork_rotate(api, temp, fretwork_one, 1);
use_temp = 1;
break;
case SEG_LEFT_RIGHT_TOP_BOTTOM:
SDL_BlitSurface(canvas_backup, &modification_rect, result, NULL);
SDL_BlitSurface(fretwork_four, NULL, result, NULL);
break;
case SEG_LEFT_RIGHT_TOP:
SDL_BlitSurface(fretwork_three, NULL, result, NULL);
break;
case SEG_LEFT_RIGHT_BOTTOM:
fretwork_flip_flop(api, temp, fretwork_three);
use_temp = 1;
break;
case SEG_LEFT_TOP_BOTTOM:
fretwork_rotate(api, temp, fretwork_three, 0);
use_temp = 1;
break;
case SEG_RIGHT_TOP_BOTTOM:
fretwork_rotate(api, temp, fretwork_three, 1);
use_temp = 1;
break;
case SEG_RIGHT_TOP:
SDL_BlitSurface(fretwork_corner, NULL, result, NULL);
break;
case SEG_RIGHT_BOTTOM:
fretwork_rotate(api, temp, fretwork_corner, 1);
use_temp = 1;
break;
case SEG_LEFT_TOP:
fretwork_rotate(api, temp, fretwork_corner, 0);
use_temp = 1;
break;
case SEG_LEFT_BOTTOM:
fretwork_flip_flop(api, temp, fretwork_corner);
use_temp = 1;
break;
}
if (use_temp)
SDL_BlitSurface(temp, NULL, result, NULL);
SDL_FreeSurface(temp);
SDL_BlitSurface(result, NULL, canvas, &modification_rect);
SDL_FreeSurface(result);
api->playsound(fretwork_snd, (x * 255) / canvas->w, 255);
}
static void fretwork_draw_wrapper(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y)
{
fretwork_segment_modified = fretwork_get_segment(x, y);
fretwork_draw((void *)ptr, which, canvas, last, x, y, fretwork_segment_modified);
if (fretwork_segment_modified_last > 0)
{
fretwork_draw((void *)ptr, which, canvas, last, x, y, fretwork_segment_modified_last);
fretwork_extract_coords_from_segment(fretwork_segment_start_rectangle, &modification_rect.x,
&modification_rect.y);
modification_rect.w = fretwork_update_rectangle_width * img_w;
modification_rect.h = fretwork_update_rectangle_height * img_h;
}
if (fretwork_segment_to_add > 0)
{
fretwork_draw((void *)ptr, which, canvas, last, x, y, fretwork_segment_to_add);
fretwork_draw((void *)ptr, which, canvas, last, x, y, fretwork_segment_modified_last);
fretwork_segment_to_add = 0;
}
fretwork_segment_modified_last = fretwork_segment_modified;
}
void fretwork_drag(magic_api * api, int which,
SDL_Surface * canvas, SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect)
{
int start_x, end_x, start_y, end_y, segment_start, segment_end, w, h;
if ((x < canvas->w) && (y < canvas->h) && (ox < canvas->w) && (oy < canvas->h) && ((signed)x > 0) && ((signed)y > 0)
&& ((signed)ox > 0) && ((signed)oy > 0))
{
api->line((void *)api, which, canvas, snapshot, ox, oy, x, y, img_w / 2, fretwork_draw_wrapper);
// This should be improved, maybe passed to fretwork_draw()
start_x = min(ox, x);
end_x = max(ox, x);
start_y = min(oy, y);
end_y = max(oy, y);
segment_start = fretwork_get_segment(start_x - img_w, start_y - img_h);
segment_end = fretwork_get_segment(end_x + img_w, end_y + img_h);
x = ((segment_start % fretwork_segments_x) - 1) * img_w;
y = (int)(segment_start / fretwork_segments_x) * img_h;
w = ((segment_end % fretwork_segments_x) - 1) * img_w - x + img_w;
h = (int)(segment_end / fretwork_segments_x) * img_h - y + img_h;
update_rect->x = x;
update_rect->y = y;
update_rect->w = w;
update_rect->h = h;
}
}
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