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/*
* Copyright (C) 2014-2022 libass contributors
*
* This file is part of libass.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include "ass_compat.h"
#include <stddef.h>
#include <stdint.h>
#include "ass_utils.h"
/**
* \brief Add two bitmaps together at a given position
* Uses additive blending, clipped to [0,255]. Pure C implementation.
*/
void ass_add_bitmaps_c(uint8_t *dst, intptr_t dst_stride,
uint8_t *src, intptr_t src_stride,
intptr_t width, intptr_t height)
{
unsigned out;
uint8_t* end = dst + dst_stride * height;
while (dst < end) {
for (unsigned j = 0; j < width; ++j) {
out = dst[j] + src[j];
dst[j] = FFMIN(out, 255);
}
dst += dst_stride;
src += src_stride;
}
}
void ass_imul_bitmaps_c(uint8_t *dst, intptr_t dst_stride,
uint8_t *src, intptr_t src_stride,
intptr_t width, intptr_t height)
{
uint8_t* end = dst + dst_stride * height;
while (dst < end) {
for (unsigned j = 0; j < width; ++j) {
dst[j] = (dst[j] * (255 - src[j]) + 255) >> 8;
}
dst += dst_stride;
src += src_stride;
}
}
void ass_mul_bitmaps_c(uint8_t *dst, intptr_t dst_stride,
uint8_t *src1, intptr_t src1_stride,
uint8_t *src2, intptr_t src2_stride,
intptr_t width, intptr_t height)
{
uint8_t* end = src1 + src1_stride * height;
while (src1 < end) {
for (unsigned x = 0; x < width; ++x) {
dst[x] = (src1[x] * src2[x] + 255) >> 8;
}
dst += dst_stride;
src1 += src1_stride;
src2 += src2_stride;
}
}
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