flood_fill_seed: separate a logic to fill a line
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1 changed files with 31 additions and 12 deletions
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@ -124,6 +124,35 @@ static void perspective_unmap(const double *c,
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typedef void (*span_func_t)(void *user_data, int y, int left, int right);
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static void flood_fill_line(struct quirc *q, int x, int y,
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int from, int to,
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int *leftp, int *rightp)
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{
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quirc_pixel_t *row;
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int left;
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int right;
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int i;
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left = x;
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right = x;
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row = q->pixels + y * q->w;
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while (left > 0 && row[left - 1] == from)
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left--;
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while (right < q->w - 1 && row[right + 1] == from)
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right++;
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/* Fill the extent */
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for (i = left; i <= right; i++)
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row[i] = to;
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/* Return the processed range */
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*leftp = left;
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*rightp = right;
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}
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static void flood_fill_seed(struct quirc *q,
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int x0, int y0,
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int from, int to,
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@ -146,20 +175,10 @@ static void flood_fill_seed(struct quirc *q,
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call:
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vars = next_vars;
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vars->left = vars->x;
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vars->right = vars->x;
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row = q->pixels + vars->y * q->w;
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while (vars->left > 0 && row[vars->left - 1] == from)
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vars->left--;
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while (vars->right < q->w - 1 && row[vars->right + 1] == from)
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vars->right++;
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/* Fill the extent */
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for (i = vars->left; i <= vars->right; i++)
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row[i] = to;
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flood_fill_line(q, vars->x, vars->y, from, to, &vars->left,
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&vars->right);
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if (func)
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func(user_data, vars->y, vars->left, vars->right);
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