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/*
* Copyright (C) 2018 Iru Cai <mytbk920423@gmail.com>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <stdlib.h>
#include <string.h>
#include "graph_struct.h"
struct graph_st * allocate_graph_st(int w, int h, int x, int y)
{
struct graph_st * newst = (struct graph_st *)
malloc(w * h * 2 + sizeof(struct graph_st));
newst->width = w;
newst->height = h;
newst->x = x;
newst->y = y;
newst->gdata = newst->data;
return newst;
}
/* crop graph a1 starting at (x, y) as laft-top coordinate,
* and get graph a2 with size w*h.
*
* this function looks buggy and can crash the game */
struct graph_st * crop_graph(struct graph_st *a1, struct graph_st *a2, int x, int y, int w, int h)
{
if (a2 == NULL) {
a2 = allocate_graph_st(w, h, 0, 0);
}
int16_t *src = &a1->gdata[a1->width * y + x];
int16_t *dst = a2->gdata;
for (int i = 0; i < h; i++) {
memcpy(dst, src, w * 2);
dst = dst + w;
src = src + a1->width;
}
return a2;
}
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