mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
synced 2026-10-07 14:18:04 +03:00
kichikuou
29a139c8a1
This replaces BYTE, WORD and DWORD types with uint8_t, uint16_t and uint32_t respectively.
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* Copyright (C) 2021 <KichikuouChrome@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#define CONCATENATE(x, y) x ## y
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#define CONCAT(x, y) CONCATENATE(x, y)
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static SDL_Rect CONCAT(sdl_floodFill_, TYPE)(int x, int y, Uint32 col) {
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int old_color = *(TYPE *)PIXEL_AT(sdl_dib, x, y);
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if (old_color == col)
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return (SDL_Rect){};
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int minx = x, maxx = x, miny = y, maxy = y;
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int stack_size = 64;
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SDL_Point *stack = malloc(sizeof(SDL_Point) * stack_size);
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int top = 0;
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stack[top] = (SDL_Point){x, y};
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while (top >= 0) {
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x = stack[top].x;
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y = stack[top].y;
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top--;
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TYPE *line = PIXEL_AT(sdl_dib, 0, y);
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TYPE *prev_line = (TYPE *)((uint8_t *)line - sdl_dib->pitch);
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TYPE *next_line = (TYPE *)((uint8_t *)line + sdl_dib->pitch);
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while (x >= 0 && line[x] == old_color) x--;
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x++;
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minx = min(x, minx);
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boolean span_above = FALSE, span_below = FALSE;
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for (; x < sdl_dib->w && line[x] == old_color; x++) {
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line[x] = col;
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if (y > 0) {
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if (!span_above && prev_line[x] == old_color) {
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if (++top >= stack_size) {
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stack_size *= 2;
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stack = realloc(stack, sizeof(SDL_Point) * stack_size);
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}
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stack[top] = (SDL_Point){x, y - 1};
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span_above = TRUE;
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} else if (span_above && prev_line[x] != old_color) {
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span_above = FALSE;
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}
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}
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if (y < sdl_dib->h - 1) {
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if (!span_below && next_line[x] == old_color) {
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if (++top >= stack_size) {
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stack_size *= 2;
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stack = realloc(stack, sizeof(SDL_Point) * stack_size);
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}
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stack[top] = (SDL_Point){x, y + 1};
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span_below = TRUE;
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} else if (span_below && next_line[x] != old_color) {
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span_below = FALSE;
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}
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}
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}
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maxx = max(x - 1, maxx);
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miny = min(y, miny);
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maxy = max(y, maxy);
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}
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free(stack);
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return (SDL_Rect){minx, miny, maxx - minx + 1, maxy - miny + 1};
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}
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#undef CONCATENATE
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#undef CONCAT
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