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flood_fill_seed: Simplify the flow by having a single "return point".

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YAMAMOTO Takashi 2021-05-11 13:46:31 +09:00
parent 1fa9b0c109
commit 38f882b3d6
2 changed files with 26 additions and 30 deletions
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51
lib/identify.c
View file

@ -169,75 +169,72 @@ static void flood_fill_seed(struct quirc *q,
struct quirc_flood_fill_vars *vars;
struct quirc_flood_fill_vars *next_vars;
int i;
quirc_pixel_t *row;
/* Set up the first context */
next_vars = stack;
next_vars->left = x0;
next_vars->left_up = x0;
next_vars->y = y0;
call:
vars = next_vars;
/*
* Note about inputs:
*
* - vars->left_up contains x value to look at.
* - vars->left_down is still a garbage here.
*/
/* Fill the extent */
flood_fill_line(q, vars->left, vars->y, from, to, &vars->left,
flood_fill_line(q, vars->left_up, vars->y, from, to, &vars->left_up,
&vars->right);
if (func)
func(user_data, vars->y, vars->left, vars->right);
func(user_data, vars->y, vars->left_up, vars->right);
if (vars == last_vars) {
return;
}
vars->left_down = vars->left_up;
/* Seed new flood-fills */
return_from_call:
if (vars->y > 0) {
row = q->pixels + (vars->y - 1) * q->w;
for (i = vars->left; i <= vars->right; i++)
if (row[i] == from) {
/* Save the current context */
vars->i = i;
vars->pc = 1;
while (vars->left_up <= vars->right) {
if (row[vars->left_up] == from) {
/* Set up the next context */
next_vars = vars + 1;
next_vars->left = i;
next_vars->left_up = vars->left_up;
next_vars->y = vars->y - 1;
goto call;
return_from_call1: ;
}
vars->left_up++;
}
}
if (vars->y < q->h - 1) {
row = q->pixels + (vars->y + 1) * q->w;
for (i = vars->left; i <= vars->right; i++)
if (row[i] == from) {
/* Save the current context */
vars->i = i;
vars->pc = 2;
while (vars->left_down <= vars->right) {
if (row[vars->left_down] == from) {
/* Set up the next context */
next_vars = vars + 1;
next_vars->left = i;
next_vars->left_up = vars->left_down;
next_vars->y = vars->y + 1;
goto call;
return_from_call2: ;
}
vars->left_down++;
}
}
if (vars > stack) {
/* Restore the previous context */
vars--;
i = vars->i;
if (vars->pc == 1) {
row = q->pixels + (vars->y - 1) * q->w;
goto return_from_call1;
}
row = q->pixels + (vars->y + 1) * q->w;
goto return_from_call2;
goto return_from_call;
}
}

5
lib/quirc_internal.h
View file

@ -83,9 +83,8 @@ struct quirc_grid {
struct quirc_flood_fill_vars {
int y;
int right;
int left;
int i;
int pc; /* caller id */
int left_up;
int left_down;
};
struct quirc {