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/*
* Copyright © 2016 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include "ao.h"
#include "ao_draw.h"
#include "ao_draw_int.h"
#define bound(val,max,other) do { \
if (val < 0) { \
other -= val; \
val = 0; \
} \
if (val > max) { \
other -= (val - max); \
val = max; \
} \
} while (0)
#define bound2(a, max_a, b, max_b) do { \
bound(a, max_a, b); \
bound(b, max_b, a); \
} while (0)
void
ao_copy(const struct ao_bitmap *dst,
int16_t dst_x,
int16_t dst_y,
int16_t width,
int16_t height,
const struct ao_bitmap *src,
int16_t src_x,
int16_t src_y,
uint8_t rop)
{
int16_t dst_x2 = dst_x + width, dst_y2 = dst_y + height;
int16_t src_x2 = src_x + width, src_y2 = src_y + height;
uint8_t reverse = 0;
uint8_t upsidedown = 0;
bound2(dst_x, dst->width, src_x, src->width);
bound2(dst_x2, dst->width, src_x2, src->width);
bound2(dst_y, dst->height, src_y, src->height);
bound2(dst_y2, dst->height, src_y2, src->height);
if (dst == src) {
reverse = (dst_x > src_x);
upsidedown = (dst_y > src_y);
}
if (dst_x < dst_x2 && dst_y < dst_y2) {
ao_blt(src->base + src_y * src->stride,
src->stride,
src_x,
dst->base + dst_y * dst->stride,
dst->stride,
dst_x,
dst_x2 - dst_x,
dst_y2 - dst_y,
rop,
reverse,
upsidedown);
}
}
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