mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-25 11:11:08 +00:00
740 lines
18 KiB
C
740 lines
18 KiB
C
/*
|
|
* Image Scaling Functions
|
|
* Copyright (c) 2005 David A. Schleef <ds@schleef.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "vs_scanline.h"
|
|
|
|
#include <liboil/liboil.h>
|
|
|
|
/* greyscale, i.e., single componenet */
|
|
|
|
void
|
|
vs_scanline_downsample_Y (uint8_t * dest, uint8_t * src, int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i] = (src[i * 2] + src[i * 2 + 1]) / 2;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_nearest_Y (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
dest[i] = (x < 32768 || j + 1 >= src_width) ? src[j] : src[j + 1];
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
#include <glib.h>
|
|
void
|
|
vs_scanline_resample_linear_Y (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (j + 1 < src_width)
|
|
dest[i] = (src[j] * (65536 - x) + src[j + 1] * x) >> 16;
|
|
else
|
|
dest[i] = src[j];
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_merge_linear_Y (uint8_t * dest, uint8_t * src1, uint8_t * src2,
|
|
int n, int x)
|
|
{
|
|
uint32_t value = x >> 8;
|
|
|
|
oil_merge_linear_u8 (dest, src1, src2, &value, n);
|
|
}
|
|
|
|
|
|
/* RGBA */
|
|
|
|
void
|
|
vs_scanline_downsample_RGBA (uint8_t * dest, uint8_t * src, int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i * 4 + 0] = (src[i * 8 + 0] + src[i * 8 + 4]) / 2;
|
|
dest[i * 4 + 1] = (src[i * 8 + 1] + src[i * 8 + 5]) / 2;
|
|
dest[i * 4 + 2] = (src[i * 8 + 2] + src[i * 8 + 6]) / 2;
|
|
dest[i * 4 + 3] = (src[i * 8 + 3] + src[i * 8 + 7]) / 2;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_nearest_RGBA (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (j + 1 < src_width) {
|
|
dest[i * 4 + 0] = (x < 32768) ? src[j * 4 + 0] : src[j * 4 + 4];
|
|
dest[i * 4 + 1] = (x < 32768) ? src[j * 4 + 1] : src[j * 4 + 5];
|
|
dest[i * 4 + 2] = (x < 32768) ? src[j * 4 + 2] : src[j * 4 + 6];
|
|
dest[i * 4 + 3] = (x < 32768) ? src[j * 4 + 3] : src[j * 4 + 7];
|
|
} else {
|
|
dest[i * 4 + 0] = src[j * 4 + 0];
|
|
dest[i * 4 + 1] = src[j * 4 + 1];
|
|
dest[i * 4 + 2] = src[j * 4 + 2];
|
|
dest[i * 4 + 3] = src[j * 4 + 3];
|
|
}
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
#include <stdio.h>
|
|
void
|
|
vs_scanline_resample_linear_RGBA (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
uint32_t vals[2];
|
|
|
|
vals[0] = *accumulator;
|
|
vals[1] = increment;
|
|
|
|
if (src_width % 2 == 0) {
|
|
oil_resample_linear_argb ((uint32_t *) dest, (uint32_t *) src, n, vals);
|
|
} else if (src_width > 1) {
|
|
if (n > 1)
|
|
oil_resample_linear_argb ((uint32_t *) dest, (uint32_t *) src, n - 1,
|
|
vals);
|
|
dest[4 * (n - 1) + 0] = src[(vals[0] >> 16) + 0];
|
|
dest[4 * (n - 1) + 1] = src[(vals[0] >> 16) + 1];
|
|
dest[4 * (n - 1) + 2] = src[(vals[0] >> 16) + 2];
|
|
dest[4 * (n - 1) + 3] = src[(vals[0] >> 16) + 3];
|
|
vals[0] += increment;
|
|
} else {
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[4 * i + 0] = src[0];
|
|
dest[4 * i + 1] = src[1];
|
|
dest[4 * i + 2] = src[2];
|
|
dest[4 * i + 3] = src[3];
|
|
vals[0] += increment;
|
|
}
|
|
}
|
|
|
|
*accumulator = vals[0];
|
|
}
|
|
|
|
void
|
|
vs_scanline_merge_linear_RGBA (uint8_t * dest, uint8_t * src1, uint8_t * src2,
|
|
int n, int x)
|
|
{
|
|
uint32_t value = x >> 8;
|
|
|
|
oil_merge_linear_argb ((uint32_t *) dest, (uint32_t *) src1,
|
|
(uint32_t *) src2, &value, n);
|
|
}
|
|
|
|
|
|
/* RGB */
|
|
|
|
void
|
|
vs_scanline_downsample_RGB (uint8_t * dest, uint8_t * src, int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i * 3 + 0] = (src[i * 6 + 0] + src[i * 6 + 3]) / 2;
|
|
dest[i * 3 + 1] = (src[i * 6 + 1] + src[i * 6 + 4]) / 2;
|
|
dest[i * 3 + 2] = (src[i * 6 + 2] + src[i * 6 + 5]) / 2;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_nearest_RGB (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
dest[i * 3 + 0] = (x < 32768
|
|
|| j + 1 >= src_width) ? src[j * 3 + 0] : src[j * 3 + 3];
|
|
dest[i * 3 + 1] = (x < 32768
|
|
|| j + 1 >= src_width) ? src[j * 3 + 1] : src[j * 3 + 4];
|
|
dest[i * 3 + 2] = (x < 32768
|
|
|| j + 1 >= src_width) ? src[j * 3 + 2] : src[j * 3 + 5];
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_linear_RGB (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (j + 1 < src_width) {
|
|
dest[i * 3 + 0] =
|
|
(src[j * 3 + 0] * (65536 - x) + src[j * 3 + 3] * x) >> 16;
|
|
dest[i * 3 + 1] =
|
|
(src[j * 3 + 1] * (65536 - x) + src[j * 3 + 4] * x) >> 16;
|
|
dest[i * 3 + 2] =
|
|
(src[j * 3 + 2] * (65536 - x) + src[j * 3 + 5] * x) >> 16;
|
|
} else {
|
|
dest[i * 3 + 0] = src[j * 3 + 0];
|
|
dest[i * 3 + 1] = src[j * 3 + 1];
|
|
dest[i * 3 + 2] = src[j * 3 + 2];
|
|
}
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_merge_linear_RGB (uint8_t * dest, uint8_t * src1, uint8_t * src2,
|
|
int n, int x)
|
|
{
|
|
uint32_t value = x >> 8;
|
|
|
|
oil_merge_linear_u8 (dest, src1, src2, &value, n * 3);
|
|
}
|
|
|
|
|
|
/* YUYV */
|
|
|
|
/* n is the number of pixels */
|
|
/* increment is per Y pixel */
|
|
|
|
void
|
|
vs_scanline_downsample_YUYV (uint8_t * dest, uint8_t * src, int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i * 4 + 0] = (src[i * 8 + 0] + src[i * 8 + 2]) / 2;
|
|
dest[i * 4 + 1] = (src[i * 8 + 1] + src[i * 8 + 5]) / 2;
|
|
dest[i * 4 + 2] = (src[i * 8 + 4] + src[i * 8 + 6]) / 2;
|
|
dest[i * 4 + 3] = (src[i * 8 + 3] + src[i * 8 + 7]) / 2;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_nearest_YUYV (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int quads = (n + 1) / 2;
|
|
|
|
for (i = 0; i < quads; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
dest[i * 4 + 0] = (x < 32768
|
|
|| j + 1 >= src_width) ? src[j * 2 + 0] : src[j * 2 + 2];
|
|
|
|
j = acc >> 17;
|
|
x = acc & 0x1ffff;
|
|
dest[i * 4 + 1] = (x < 65536
|
|
|| 2 * (j + 2) >= src_width) ? src[j * 4 + 1] : src[j * 4 + 5];
|
|
|
|
if (2 * i + 1 < n && 2 * (j + 1) < src_width)
|
|
dest[i * 4 + 3] = (x < 65536
|
|
|| 2 * (j + 3) >= src_width) ? src[j * 4 + 3] : src[j * 4 + 7];
|
|
|
|
acc += increment;
|
|
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (2 * i + 1 < n && j < src_width) {
|
|
dest[i * 4 + 2] = (x < 32768
|
|
|| j + 1 >= src_width) ? src[j * 2 + 0] : src[j * 2 + 2];
|
|
acc += increment;
|
|
}
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_linear_YUYV (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int quads = (n + 1) / 2;
|
|
|
|
for (i = 0; i < quads; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (j + 1 < src_width)
|
|
dest[i * 4 + 0] =
|
|
(src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
|
|
else
|
|
dest[i * 4 + 0] = src[j * 2 + 0];
|
|
|
|
j = acc >> 17;
|
|
x = acc & 0x1ffff;
|
|
|
|
if (2 * (j + 2) < src_width)
|
|
dest[i * 4 + 1] =
|
|
(src[j * 4 + 1] * (131072 - x) + src[j * 4 + 5] * x) >> 17;
|
|
else
|
|
dest[i * 4 + 1] = src[j * 4 + 1];
|
|
|
|
if (2 * i + 1 < n && 2 * (j + 1) < src_width) {
|
|
if (2 * (j + 3) < src_width)
|
|
dest[i * 4 + 3] =
|
|
(src[j * 4 + 3] * (131072 - x) + src[j * 4 + 7] * x) >> 17;
|
|
else
|
|
dest[i * 4 + 3] = src[j * 4 + 3];
|
|
}
|
|
|
|
acc += increment;
|
|
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (2 * i + 1 < n && j < src_width) {
|
|
if (j + 1 < src_width)
|
|
dest[i * 4 + 2] =
|
|
(src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
|
|
else
|
|
dest[i * 4 + 2] = src[j * 2 + 0];
|
|
acc += increment;
|
|
}
|
|
}
|
|
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_merge_linear_YUYV (uint8_t * dest, uint8_t * src1, uint8_t * src2,
|
|
int n, int x)
|
|
{
|
|
int i;
|
|
int quads = (n + 1) / 2;
|
|
|
|
for (i = 0; i < quads; i++) {
|
|
dest[i * 4 + 0] =
|
|
(src1[i * 4 + 0] * (65536 - x) + src2[i * 4 + 0] * x) >> 16;
|
|
dest[i * 4 + 1] =
|
|
(src1[i * 4 + 1] * (65536 - x) + src2[i * 4 + 1] * x) >> 16;
|
|
|
|
if (2 * i + 1 < n) {
|
|
dest[i * 4 + 2] =
|
|
(src1[i * 4 + 2] * (65536 - x) + src2[i * 4 + 2] * x) >> 16;
|
|
dest[i * 4 + 3] =
|
|
(src1[i * 4 + 3] * (65536 - x) + src2[i * 4 + 3] * x) >> 16;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* UYVY */
|
|
|
|
/* n is the number of bi-pixels */
|
|
/* increment is per Y pixel */
|
|
|
|
void
|
|
vs_scanline_downsample_UYVY (uint8_t * dest, uint8_t * src, int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i * 4 + 0] = (src[i * 8 + 0] + src[i * 8 + 4]) / 2;
|
|
dest[i * 4 + 1] = (src[i * 8 + 1] + src[i * 8 + 3]) / 2;
|
|
dest[i * 4 + 2] = (src[i * 8 + 2] + src[i * 8 + 6]) / 2;
|
|
dest[i * 4 + 3] = (src[i * 8 + 5] + src[i * 8 + 7]) / 2;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_nearest_UYVY (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int quads = (n + 1) / 2;
|
|
|
|
for (i = 0; i < quads; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
dest[i * 4 + 1] = (x < 32768
|
|
|| j + 1 >= src_width) ? src[j * 2 + 1] : src[j * 2 + 3];
|
|
|
|
j = acc >> 17;
|
|
x = acc & 0x1ffff;
|
|
|
|
dest[i * 4 + 0] = (x < 65536
|
|
|| 2 * (j + 2) >= src_width) ? src[j * 4 + 0] : src[j * 4 + 4];
|
|
|
|
if (2 * i + 1 < n && 2 * (j + 1) < src_width)
|
|
dest[i * 4 + 2] = (x < 65536
|
|
|| 2 * (j + 3) >= src_width) ? src[j * 4 + 2] : src[j * 4 + 6];
|
|
|
|
acc += increment;
|
|
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (2 * i + 1 < n && j < src_width) {
|
|
dest[i * 4 + 3] = (x < 32768
|
|
|| j + 1 >= src_width) ? src[j * 2 + 1] : src[j * 2 + 3];
|
|
acc += increment;
|
|
}
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_linear_UYVY (uint8_t * dest, uint8_t * src, int src_width,
|
|
int n, int *accumulator, int increment)
|
|
{
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int quads = (n + 1) / 2;
|
|
|
|
for (i = 0; i < quads; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (j + 1 < src_width)
|
|
dest[i * 4 + 1] =
|
|
(src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
|
|
else
|
|
dest[i * 4 + 1] = src[j * 2 + 1];
|
|
|
|
j = acc >> 17;
|
|
x = acc & 0x1ffff;
|
|
if (2 * (j + 2) < src_width)
|
|
dest[i * 4 + 0] =
|
|
(src[j * 4 + 0] * (131072 - x) + src[j * 4 + 4] * x) >> 17;
|
|
else
|
|
dest[i * 4 + 0] = src[j * 4 + 0];
|
|
|
|
if (i * 2 + 1 < n && 2 * (j + 1) < src_width) {
|
|
if (2 * (j + 3) < src_width)
|
|
dest[i * 4 + 2] =
|
|
(src[j * 4 + 2] * (131072 - x) + src[j * 4 + 6] * x) >> 17;
|
|
else
|
|
dest[i * 4 + 2] = src[j * 4 + 2];
|
|
}
|
|
|
|
acc += increment;
|
|
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (2 * i + 1 < n && j < src_width) {
|
|
if (j + 1 < src_width)
|
|
dest[i * 4 + 3] =
|
|
(src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
|
|
else
|
|
dest[i * 4 + 3] = src[j * 2 + 1];
|
|
acc += increment;
|
|
}
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_merge_linear_UYVY (uint8_t * dest, uint8_t * src1,
|
|
uint8_t * src2, int n, int x)
|
|
{
|
|
int i;
|
|
int quads = (n + 1) / 2;
|
|
|
|
for (i = 0; i < quads; i++) {
|
|
dest[i * 4 + 0] =
|
|
(src1[i * 4 + 0] * (65536 - x) + src2[i * 4 + 0] * x) >> 16;
|
|
dest[i * 4 + 1] =
|
|
(src1[i * 4 + 1] * (65536 - x) + src2[i * 4 + 1] * x) >> 16;
|
|
|
|
if (2 * i + 1 < n) {
|
|
dest[i * 4 + 2] =
|
|
(src1[i * 4 + 2] * (65536 - x) + src2[i * 4 + 2] * x) >> 16;
|
|
dest[i * 4 + 3] =
|
|
(src1[i * 4 + 3] * (65536 - x) + src2[i * 4 + 3] * x) >> 16;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* RGB565 */
|
|
|
|
/* note that src and dest are uint16_t, and thus endian dependent */
|
|
|
|
#define RGB565_R(x) (((x)&0xf800)>>8 | ((x)&0xf800)>>13)
|
|
#define RGB565_G(x) (((x)&0x07e0)>>3 | ((x)&0x07e0)>>9)
|
|
#define RGB565_B(x) (((x)&0x001f)<<3 | ((x)&0x001f)>>2)
|
|
|
|
#define RGB565(r,g,b) \
|
|
((((r)<<8)&0xf800) | (((g)<<3)&0x07e0) | (((b)>>3)&0x001f))
|
|
|
|
|
|
void
|
|
vs_scanline_downsample_RGB565 (uint8_t * dest_u8, uint8_t * src_u8, int n)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src = (uint16_t *) src_u8;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i] = RGB565 (
|
|
(RGB565_R (src[i * 2]) + RGB565_R (src[i * 2 + 1])) / 2,
|
|
(RGB565_G (src[i * 2]) + RGB565_G (src[i * 2 + 1])) / 2,
|
|
(RGB565_B (src[i * 2]) + RGB565_B (src[i * 2 + 1])) / 2);
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_nearest_RGB565 (uint8_t * dest_u8, uint8_t * src_u8,
|
|
int src_width, int n, int *accumulator, int increment)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src = (uint16_t *) src_u8;
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
dest[i] = (x < 32768 || j + 1 >= src_width) ? src[j] : src[j + 1];
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_linear_RGB565 (uint8_t * dest_u8, uint8_t * src_u8,
|
|
int src_width, int n, int *accumulator, int increment)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src = (uint16_t *) src_u8;
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (j + 1 < src_width) {
|
|
dest[i] = RGB565 (
|
|
(RGB565_R (src[j]) * (65536 - x) + RGB565_R (src[j + 1]) * x) >> 16,
|
|
(RGB565_G (src[j]) * (65536 - x) + RGB565_G (src[j + 1]) * x) >> 16,
|
|
(RGB565_B (src[j]) * (65536 - x) + RGB565_B (src[j + 1]) * x) >> 16);
|
|
} else {
|
|
dest[i] = RGB565 (RGB565_R (src[j]),
|
|
RGB565_G (src[j]), RGB565_B (src[j]));
|
|
}
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_merge_linear_RGB565 (uint8_t * dest_u8, uint8_t * src1_u8,
|
|
uint8_t * src2_u8, int n, int x)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src1 = (uint16_t *) src1_u8;
|
|
uint16_t *src2 = (uint16_t *) src2_u8;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i] = RGB565 (
|
|
(RGB565_R (src1[i]) * (65536 - x) + RGB565_R (src2[i]) * x) >> 16,
|
|
(RGB565_G (src1[i]) * (65536 - x) + RGB565_G (src2[i]) * x) >> 16,
|
|
(RGB565_B (src1[i]) * (65536 - x) + RGB565_B (src2[i]) * x) >> 16);
|
|
}
|
|
}
|
|
|
|
|
|
/* RGB555 */
|
|
|
|
/* note that src and dest are uint16_t, and thus endian dependent */
|
|
|
|
#define RGB555_R(x) (((x)&0x7c00)>>8 | ((x)&0x7c00)>>13)
|
|
#define RGB555_G(x) (((x)&0x03e0)>>3 | ((x)&0x03e0)>>9)
|
|
#define RGB555_B(x) (((x)&0x001f)<<3 | ((x)&0x001f)>>2)
|
|
|
|
#define RGB555(r,g,b) \
|
|
((((r)<<7)&0x7c00) | (((g)<<3)&0x03e0) | (((b)>>3)&0x001f))
|
|
|
|
|
|
void
|
|
vs_scanline_downsample_RGB555 (uint8_t * dest_u8, uint8_t * src_u8, int n)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src = (uint16_t *) src_u8;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i] = RGB555 (
|
|
(RGB555_R (src[i * 2]) + RGB555_R (src[i * 2 + 1])) / 2,
|
|
(RGB555_G (src[i * 2]) + RGB555_G (src[i * 2 + 1])) / 2,
|
|
(RGB555_B (src[i * 2]) + RGB555_B (src[i * 2 + 1])) / 2);
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_nearest_RGB555 (uint8_t * dest_u8, uint8_t * src_u8,
|
|
int src_width, int n, int *accumulator, int increment)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src = (uint16_t *) src_u8;
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
dest[i] = (x < 32768 || j + 1 >= src_width) ? src[j] : src[j + 1];
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_resample_linear_RGB555 (uint8_t * dest_u8, uint8_t * src_u8,
|
|
int src_width, int n, int *accumulator, int increment)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src = (uint16_t *) src_u8;
|
|
int acc = *accumulator;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (j + 1 < src_width) {
|
|
dest[i] = RGB555 (
|
|
(RGB555_R (src[j]) * (65536 - x) + RGB555_R (src[j + 1]) * x) >> 16,
|
|
(RGB555_G (src[j]) * (65536 - x) + RGB555_G (src[j + 1]) * x) >> 16,
|
|
(RGB555_B (src[j]) * (65536 - x) + RGB555_B (src[j + 1]) * x) >> 16);
|
|
} else {
|
|
dest[i] = RGB555 (RGB555_R (src[j]),
|
|
RGB555_G (src[j]), RGB555_B (src[j]));
|
|
}
|
|
|
|
acc += increment;
|
|
}
|
|
|
|
*accumulator = acc;
|
|
}
|
|
|
|
void
|
|
vs_scanline_merge_linear_RGB555 (uint8_t * dest_u8, uint8_t * src1_u8,
|
|
uint8_t * src2_u8, int n, int x)
|
|
{
|
|
uint16_t *dest = (uint16_t *) dest_u8;
|
|
uint16_t *src1 = (uint16_t *) src1_u8;
|
|
uint16_t *src2 = (uint16_t *) src2_u8;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dest[i] = RGB555 (
|
|
(RGB555_R (src1[i]) * (65536 - x) + RGB555_R (src2[i]) * x) >> 16,
|
|
(RGB555_G (src1[i]) * (65536 - x) + RGB555_G (src2[i]) * x) >> 16,
|
|
(RGB555_B (src1[i]) * (65536 - x) + RGB555_B (src2[i]) * x) >> 16);
|
|
}
|
|
}
|