/* マウスやウィンドウの重ね合わせ処理 */

#include "bootpack.h"

#define SHEET_USE		1

extern unsigned short table_8_565[256];

struct SHTCTL *shtctl_init(struct MEMMAN *memman, unsigned char *vram, int xsize, int ysize)
{
	struct SHTCTL *ctl;
	int i;
	ctl = (struct SHTCTL *) memman_alloc_4k(memman, sizeof (struct SHTCTL));
	if (ctl == 0) {
		goto err;
	}
	ctl->map = (unsigned char *) memman_alloc_4k(memman, xsize * ysize);
	if (ctl->map == 0) {
		memman_free_4k(memman, (int) ctl, sizeof (struct SHTCTL));
		goto err;
	}
	ctl->vram = vram;
	ctl->xsize = xsize;
	ctl->ysize = ysize;
	ctl->top = -1; /* シートは一枚もない */
	for (i = 0; i < MAX_SHEETS; i++) {
		ctl->sheets0[i].flags = 0; /* 未使用マーク */
		ctl->sheets0[i].ctl = ctl; /* 所属を記録 */
	}
err:
	return ctl;
}

struct SHEET *sheet_alloc(struct SHTCTL *ctl)
{
	struct SHEET *sht;
	int i;
	for (i = 0; i < MAX_SHEETS; i++) {
		if (ctl->sheets0[i].flags == 0) {
			sht = &ctl->sheets0[i];
			sht->flags = SHEET_USE; /* 使用中マーク */
			sht->height = -1; /* 非表示中 */
			sht->task = 0;	/* 自動で閉じる機能を使わない */
			return sht;
		}
	}
	return 0;	/* 全てのシートが使用中だった */
}

void sheet_setbuf(struct SHEET *sht, unsigned short *buf, int xsize, int ysize, int col_inv)
{
	sht->buf = buf;
	sht->bxsize = xsize;
	sht->bysize = ysize;
	sht->name = "sheet";
	if (col_inv != -1) {
		sht->col_inv = table_8_565[col_inv];
	} else {
		sht->col_inv = -1;
	}
	return;
}

void sheet_refreshmap(struct SHTCTL *ctl, int vx0, int vy0, int vx1, int vy1, int h0)
{
	int h, bx, by, vx, vy, bx0, by0, bx1, by1, sid4, *p = 0;
	unsigned short *buf;
	unsigned char sid, *map = ctl->map;
	struct SHEET *sht;
	if (vx0 < 0) vx0 = 0;
	if (vy0 < 0) vy0 = 0;
	if (vx1 > ctl->xsize) vx1 = ctl->xsize;
	if (vy1 > ctl->ysize) vy1 = ctl->ysize;
	for (h = h0; h <= ctl->top; h++) {
		sht = ctl->sheets[h];
		sid = sht - ctl->sheets0; /* 番地を引き算してそれを下じき番号として利用 */
		buf = sht->buf;
		bx0 = vx0 - sht->vx0;
		by0 = vy0 - sht->vy0;
		bx1 = vx1 - sht->vx0;
		by1 = vy1 - sht->vy0;
		if (bx0 < 0) bx0 = 0;
		if (by0 < 0) by0 = 0;
		if (bx1 > sht->bxsize) bx1 = sht->bxsize;
		if (by1 > sht->bysize) by1 = sht->bysize;
		if (sht->col_inv == -1) {
			if ((sht->vx0 & 3) == 0 && (bx0 & 3) == 0 && (bx1 & 3) == 0) {
				/* 透明色なし専用の高速版（4バイト型） */
				bx1 = (bx1 - bx0) / 4; /* MOV回数 */
				sid4 = sid | sid << 8 | sid << 16 | sid << 24;
				for (by = by0; by < by1; by++) {
					vy = sht->vy0 + by;
					vx = sht->vx0 + bx0;
					p = (int *) &map[vy * ctl->xsize + vx];
					for (bx = 0; bx < bx1; bx++) {
						p[bx] = sid4;
					}
				}
			} else {
				/* 透明色なし専用の高速版（1バイト型） */
				for (by = by0; by < by1; by++) {
					vy = sht->vy0 + by;
					for (bx = bx0; bx < bx1; bx++) {
						vx = sht->vx0 + bx;
						map[vy * ctl->xsize + vx] = sid;
					}
				}
			}
		} else {
			/* 透明色ありの一般版 */
			for (by = by0; by < by1; by++) {
				vy = sht->vy0 + by;
				for (bx = bx0; bx < bx1; bx++) {
					vx = sht->vx0 + bx;
					if (buf[by * sht->bxsize + bx] != sht->col_inv) {
						map[vy * ctl->xsize + vx] = sid;
					}
				}
			}
		}
	}
	return;
}

void sheet_refreshsub(struct SHTCTL *ctl, int vx0, int vy0, int vx1, int vy1, int h0, int h1)
{
	struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
	int h, bx, by, vx, vy, bx0, by0, bx1, by1, bx2, i, i1, *q, *r;
	unsigned char *vram = ctl->vram, *map = ctl->map, sid;
	unsigned short *buf, sid2, *o;
	struct SHEET *sht;
	/* refresh範囲が画面外にはみ出していたら補正 */
	if (vx0 < 0) vx0 = 0;
	if (vy0 < 0) vy0 = 0;
	if (vx1 > ctl->xsize) vx1 = ctl->xsize;
	if (vy1 > ctl->ysize) vy1 = ctl->ysize;
	for (h = h0; h <= h1; h++) {
		sht = ctl->sheets[h];
		buf = sht->buf;
		sid = sht - ctl->sheets0;
		/* vx0〜vy1を使って、bx0〜by1を逆算する */
		bx0 = vx0 - sht->vx0;
		by0 = vy0 - sht->vy0;
		bx1 = vx1 - sht->vx0;
		by1 = vy1 - sht->vy0;
		if (bx0 < 0) bx0 = 0;
		if (by0 < 0) by0 = 0;
		if (bx1 > sht->bxsize) bx1 = sht->bxsize;
		if (by1 > sht->bysize) by1 = sht->bysize;
		if (binfo->vmode == 8) {
			/* 8ビットカラー */
			/* 1バイト型 */
			for (by = by0; by < by1; by++) {
				vy = sht->vy0 + by;
				for (bx = bx0; bx < bx1; bx++) {
					vx = sht->vx0 + bx;
					if (map[vy * ctl->xsize + vx] == sid) {
						vram[vy * ctl->xsize + vx] = buf[by * sht->bxsize + bx];
					}
				}
			}
		} else {
			/* 16ビットカラー */
			if ((sht->vx0 & 2) == 0) {
				/* 4バイト型 */
				i  = (bx0 + 1) / 2; /* bx0を2で割ったもの（端数切り上げ） */
				i1 =  bx1      / 2; /* bx1を2で割ったもの（端数切り捨て） */
				i1 = i1 - i;
				sid2 = sid | sid << 8;
				for (by = by0; by < by1; by++) {
					vy = sht->vy0 + by;
					for (bx = bx0; bx < bx1 && (bx & 1) != 0; bx++) {	/* 前の端数を1バイトずつ */
						vx = sht->vx0 + bx;
						if (map[vy * ctl->xsize + vx] == sid) {
							*(unsigned short *)	&vram[(vy * ctl->xsize + vx) * 2] =
								buf[by * sht->bxsize + bx];
						}
					}
					vx = sht->vx0 + bx;
					o = (unsigned short *) &map[vy * ctl->xsize + vx];
					q = (int   *) &vram[(vy * ctl->xsize + vx) * 2];
					r = (int   *) &buf[by * sht->bxsize + bx];
					for (i = 0; i < i1; i++) {							/* 2の倍数部分 */
						if (o[i] == sid2) {
							q[i] = r[i];
						} else {
							bx2 = bx + i * 2;
							vx = sht->vx0 + bx2;
							if (map[vy * ctl->xsize + vx + 0] == sid) {
								*(unsigned short *)	&vram[(vy * ctl->xsize + vx + 0) * 2] =
									buf[by * sht->bxsize + bx2 + 0];
							}
							if (map[vy * ctl->xsize + vx + 1] == sid) {
								*(unsigned short *)	&vram[(vy * ctl->xsize + vx + 1) * 2] =
									buf[by * sht->bxsize + bx2 + 1];
							}
						}
					}
					for (bx += i1 * 2; bx < bx1; bx++) {				/* 後の端数を1バイトずつ */
						vx = sht->vx0 + bx;
						if (map[vy * ctl->xsize + vx] == sid) {
							*(unsigned short *)	&vram[(vy * ctl->xsize + vx) * 2] =
								buf[by * sht->bxsize + bx];
						}
					}
				}
			} else {
				/* 2バイト型 */
				for (by = by0; by < by1; by++) {
					vy = sht->vy0 + by;
					for (bx = bx0; bx < bx1; bx++) {
						vx = sht->vx0 + bx;
						if (map[vy * ctl->xsize + vx] == sid) {
							*(unsigned short *)	&vram[(vy * ctl->xsize + vx) * 2] =
								buf[by * sht->bxsize + bx];
						}
					}
				}
			}
		}
	}
	return;
}

void sheet_updown(struct SHEET *sht, int height)
{
	struct SHTCTL *ctl = sht->ctl;
	int h, old = sht->height; /* 設定前の高さを記憶する */

	/* 指定が低すぎや高すぎだったら、修正する */
	if (height > ctl->top + 1) {
		height = ctl->top + 1;
	}
	if (height < -1) {
		height = -1;
	}
	sht->height = height; /* 高さを設定 */

	/* 以下は主にsheets[]の並べ替え */
	if (old > height) {	/* 以前よりも低くなる */
		if (height >= 0) {
			/* 間のものを引き上げる */
			for (h = old; h > height; h--) {
				ctl->sheets[h] = ctl->sheets[h - 1];
				ctl->sheets[h]->height = h;
			}
			ctl->sheets[height] = sht;
			sheet_refreshmap(ctl, sht->vx0, sht->vy0, sht->vx0 + sht->bxsize, sht->vy0 + sht->bysize, height + 1);
			sheet_refreshsub(ctl, sht->vx0, sht->vy0, sht->vx0 + sht->bxsize, sht->vy0 + sht->bysize, height + 1, old);
		} else {	/* 非表示化 */
			if (ctl->top > old) {
				/* 上になっているものをおろす */
				for (h = old; h < ctl->top; h++) {
					ctl->sheets[h] = ctl->sheets[h + 1];
					ctl->sheets[h]->height = h;
				}
			}
			ctl->top--; /* 表示中の下じきが一つ減るので、一番上の高さが減る */
			sheet_refreshmap(ctl, sht->vx0, sht->vy0, sht->vx0 + sht->bxsize, sht->vy0 + sht->bysize, 0);
			sheet_refreshsub(ctl, sht->vx0, sht->vy0, sht->vx0 + sht->bxsize, sht->vy0 + sht->bysize, 0, old - 1);
		}
	} else if (old < height) {	/* 以前よりも高くなる */
		if (old >= 0) {
			/* 間のものを押し下げる */
			for (h = old; h < height; h++) {
				ctl->sheets[h] = ctl->sheets[h + 1];
				ctl->sheets[h]->height = h;
			}
			ctl->sheets[height] = sht;
		} else {	/* 非表示状態から表示状態へ */
			/* 上になるものを持ち上げる */
			for (h = ctl->top; h >= height; h--) {
				ctl->sheets[h + 1] = ctl->sheets[h];
				ctl->sheets[h + 1]->height = h + 1;
			}
			ctl->sheets[height] = sht;
			ctl->top++; /* 表示中の下じきが一つ増えるので、一番上の高さが増える */
		}
		sheet_refreshmap(ctl, sht->vx0, sht->vy0, sht->vx0 + sht->bxsize, sht->vy0 + sht->bysize, height);
		sheet_refreshsub(ctl, sht->vx0, sht->vy0, sht->vx0 + sht->bxsize, sht->vy0 + sht->bysize, height, height);
	}
	return;
}

void sheet_refresh(struct SHEET *sht, int bx0, int by0, int bx1, int by1)
{
	if (sht->height >= 0) { /* もしも表示中なら、新しい下じきの情報に沿って画面を描き直す */
		sheet_refreshsub(sht->ctl, sht->vx0 + bx0, sht->vy0 + by0, sht->vx0 + bx1, sht->vy0 + by1, sht->height, sht->height);
	}
	return;
}

void sheet_slide(struct SHEET *sht, int vx0, int vy0)
{
	struct SHTCTL *ctl = sht->ctl;
	int old_vx0 = sht->vx0, old_vy0 = sht->vy0;
	sht->vx0 = vx0;
	sht->vy0 = vy0;
	if (sht->height >= 0) { /* もしも表示中なら、新しい下じきの情報に沿って画面を描き直す */
		sheet_refreshmap(ctl, old_vx0, old_vy0, old_vx0 + sht->bxsize, old_vy0 + sht->bysize, 0);
		sheet_refreshmap(ctl, vx0, vy0, vx0 + sht->bxsize, vy0 + sht->bysize, sht->height);
		sheet_refreshsub(ctl, old_vx0, old_vy0, old_vx0 + sht->bxsize, old_vy0 + sht->bysize, 0, sht->height - 1);
		sheet_refreshsub(ctl, vx0, vy0, vx0 + sht->bxsize, vy0 + sht->bysize, sht->height, sht->height);
	}
	return;
}

void sheet_free(struct SHEET *sht)
{
	if (sht->height >= 0) {
		sheet_updown(sht, -1); /* 表示中ならまず非表示にする */
	}
	sht->flags = 0; /* 未使用マーク */
	return;
}
