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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 O 0
#define I AO_ALLONES
struct ao_merge_rop {
uint32_t ca1, cx1, ca2, cx2;
};
const struct ao_merge_rop ao_merge_rop[16] = {
{O, O, O, O}, /* clear 0x0 0 */
{I, O, O, O}, /* and 0x1 src AND dst */
{I, O, I, O}, /* andReverse 0x2 src AND NOT dst */
{O, O, I, O}, /* copy 0x3 src */
{I, I, O, O}, /* andInverted 0x4 NOT src AND dst */
{O, I, O, O}, /* noop 0x5 dst */
{O, I, I, O}, /* xor 0x6 src XOR dst */
{I, I, I, O}, /* or 0x7 src OR dst */
{I, I, I, I}, /* nor 0x8 NOT src AND NOT dst */
{O, I, I, I}, /* equiv 0x9 NOT src XOR dst */
{O, I, O, I}, /* invert 0xa NOT dst */
{I, I, O, I}, /* orReverse 0xb src OR NOT dst */
{O, O, I, I}, /* copyInverted 0xc NOT src */
{I, O, I, I}, /* orInverted 0xd NOT src OR dst */
{I, O, O, I}, /* nand 0xe NOT src OR NOT dst */
{O, O, O, I}, /* set 0xf 1 */
};
#define ao_do_merge_rop(src, dst) \
(((dst) & (((src) & _ca1) ^ _cx1)) ^ (((src) & _ca2) ^ _cx2))
#define ao_do_dst_invarient_merge_rop(src) (((src) & _ca2) ^ _cx2)
#define ao_do_mask_merge_rop(src, dst, mask) \
(((dst) & ((((src) & _ca1) ^ _cx1) | ~(mask))) ^ ((((src) & _ca2) ^ _cx2) & (mask)))
#define ao_dst_invarient_merge_rop() (_ca1 == 0 && _cx1 == 0)
void
ao_blt(uint32_t *src_line,
int16_t src_stride,
int16_t src_x,
uint32_t *dst_line,
int16_t dst_stride,
int16_t dst_x,
int16_t width,
int16_t height,
uint8_t rop,
uint8_t reverse,
uint8_t upsidedown)
{
uint32_t *src, *dst;
uint32_t _ca1, _cx1, _ca2, _cx2;
uint8_t dst_invarient;
uint32_t startmask, endmask;
int16_t nmiddle, n;
uint32_t bits1, bits;
int16_t left_shift, right_shift;
_ca1 = ao_merge_rop[rop].ca1;
_cx1 = ao_merge_rop[rop].cx1;
_ca2 = ao_merge_rop[rop].ca2;
_cx2 = ao_merge_rop[rop].cx2;
dst_invarient = ao_dst_invarient_merge_rop();
if (upsidedown) {
src_line += (height - 1) * src_stride;
dst_line += (height - 1) * dst_stride;
src_stride = -src_stride;
dst_stride = -dst_stride;
}
ao_mask_bits(dst_x, width, startmask, nmiddle, endmask);
if (reverse) {
src_line += ((src_x + width - 1) >> AO_SHIFT) + 1;
dst_line += ((dst_x + width - 1) >> AO_SHIFT) + 1;
src_x = (src_x + width - 1) & AO_MASK;
dst_x = (dst_x + width - 1) & AO_MASK;
} else {
src_line += src_x >> AO_SHIFT;
dst_line += dst_x >> AO_SHIFT;
src_x &= AO_MASK;
dst_x &= AO_MASK;
}
if (src_x == dst_x) {
while (height--) {
src = src_line;
src_line += src_stride;
dst = dst_line;
dst_line += dst_stride;
if (reverse) {
if (endmask) {
bits = *--src;
--dst;
*dst = ao_do_mask_merge_rop(bits, *dst, endmask);
}
n = nmiddle;
if (dst_invarient) {
while (n--)
*--dst = ao_do_dst_invarient_merge_rop(*--src);
}
else {
while (n--) {
bits = *--src;
--dst;
*dst = ao_do_merge_rop(bits, *dst);
}
}
if (startmask) {
bits = *--src;
--dst;
*dst = ao_do_mask_merge_rop(bits, *dst, startmask);
}
}
else {
if (startmask) {
bits = *src++;
*dst = ao_do_mask_merge_rop(bits, *dst, startmask);
dst++;
}
n = nmiddle;
if (dst_invarient) {
while (n--)
*dst++ = ao_do_dst_invarient_merge_rop(*src++);
}
else {
while (n--) {
bits = *src++;
*dst = ao_do_merge_rop(bits, *dst);
dst++;
}
}
if (endmask) {
bits = *src;
*dst = ao_do_mask_merge_rop(bits, *dst, endmask);
}
}
}
} else {
if (src_x > dst_x) {
left_shift = src_x - dst_x;
right_shift = AO_UNIT - left_shift;
} else {
right_shift = dst_x - src_x;
left_shift = AO_UNIT - right_shift;
}
while (height--) {
src = src_line;
src_line += src_stride;
dst = dst_line;
dst_line += dst_stride;
bits1 = 0;
if (reverse) {
if (src_x < dst_x)
bits1 = *--src;
if (endmask) {
bits = ao_right(bits1, right_shift);
if (ao_right(endmask, left_shift)) {
bits1 = *--src;
bits |= ao_left(bits1, left_shift);
}
--dst;
*dst = ao_do_mask_merge_rop(bits, *dst, endmask);
}
n = nmiddle;
if (dst_invarient) {
while (n--) {
bits = ao_right(bits1, right_shift);
bits1 = *--src;
bits |= ao_left(bits1, left_shift);
--dst;
*dst = ao_do_dst_invarient_merge_rop(bits);
}
} else {
while (n--) {
bits = ao_right(bits1, right_shift);
bits1 = *--src;
bits |= ao_left(bits1, left_shift);
--dst;
*dst = ao_do_merge_rop(bits, *dst);
}
}
if (startmask) {
bits = ao_right(bits1, right_shift);
if (ao_right(startmask, left_shift)) {
bits1 = *--src;
bits |= ao_left(bits1, left_shift);
}
--dst;
*dst = ao_do_mask_merge_rop(bits, *dst, startmask);
}
}
else {
if (src_x > dst_x)
bits1 = *src++;
if (startmask) {
bits = ao_left(bits1, left_shift);
if (ao_left(startmask, right_shift)) {
bits1 = *src++;
bits |= ao_right(bits1, right_shift);
}
*dst = ao_do_mask_merge_rop(bits, *dst, startmask);
dst++;
}
n = nmiddle;
if (dst_invarient) {
while (n--) {
bits = ao_left(bits1, left_shift);
bits1 = *src++;
bits |= ao_right(bits1, right_shift);
*dst = ao_do_dst_invarient_merge_rop(bits);
dst++;
}
}
else {
while (n--) {
bits = ao_left(bits1, left_shift);
bits1 = *src++;
bits |= ao_right(bits1, right_shift);
*dst = ao_do_merge_rop(bits, *dst);
dst++;
}
}
if (endmask) {
bits = ao_left(bits1, left_shift);
if (ao_left(endmask, right_shift)) {
bits1 = *src;
bits |= ao_right(bits1, right_shift);
}
*dst = ao_do_mask_merge_rop(bits, *dst, endmask);
}
}
}
}
}
void
ao_solid(uint32_t and,
uint32_t xor,
uint32_t *dst,
int16_t dst_stride,
int16_t dst_x,
int16_t width,
int16_t height)
{
uint32_t startmask, endmask;
int16_t nmiddle;
int16_t n;
dst += dst_x >> AO_SHIFT;
dst_x &= AO_MASK;
ao_mask_bits(dst_x, width, startmask, nmiddle, endmask);
if (startmask)
dst_stride--;
dst_stride -= nmiddle;
while (height--) {
if (startmask) {
*dst = ao_do_mask_rrop(*dst, and, xor, startmask);
dst++;
}
n = nmiddle;
if (!and)
while (n--)
*dst++ = xor;
else
while (n--) {
*dst = ao_do_rrop(*dst, and, xor);
dst++;
}
if (endmask)
*dst = ao_do_mask_rrop(*dst, and, xor, endmask);
dst += dst_stride;
}
}
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