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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pcd.h"
/* ------------------------------------------------------------------------ */
#define RANGE 320
#define RED_NUL 137
#define BLUE_NUL 156
#define LUN_MUL 360
#define RED_MUL 512
#define BLUE_MUL 512
#define GREEN1_MUL (-RED_MUL/2)
#define GREEN2_MUL (-BLUE_MUL/6)
#define RED_ADD (-RED_NUL*RED_MUL)
#define BLUE_ADD (-BLUE_NUL*BLUE_MUL)
#define GREEN1_ADD (-RED_ADD/2)
#define GREEN2_ADD (-BLUE_ADD/6)
static int LUT_flag = 0;
static uint_fast16_t LUT_gray_char[256];
static uint_fast16_t LUT_gray_int[256];
static uint_fast16_t LUT_red[256];
static uint_fast16_t LUT_blue[256];
static uint_fast16_t LUT_green1[256];
static uint_fast16_t LUT_green2[256];
int32_t LUT_range[256 + 2 * RANGE];
uint32_t LUT_15_red[256];
uint32_t LUT_15_green[256];
uint32_t LUT_15_blue[256];
uint32_t LUT_16_red[256];
uint32_t LUT_16_green[256];
uint32_t LUT_16_blue[256];
uint32_t LUT_24_red[256];
uint32_t LUT_24_green[256];
uint32_t LUT_24_blue[256];
/* ------------------------------------------------------------------------ */
void
pcd_get_LUT_init()
{
register int i;
/* only once needed */
if (LUT_flag)
return;
LUT_flag = 1;
/* init Lookup tables */
for (i = 0; i < 256; i++) {
LUT_gray_int[i] = i * LUN_MUL >> 8;
LUT_red[i] = (RED_ADD + i * RED_MUL) >> 8;
LUT_blue[i] = (BLUE_ADD + i * BLUE_MUL) >> 8;
LUT_green1[i] = (GREEN1_ADD + i * GREEN1_MUL) >> 8;
LUT_green2[i] = (GREEN2_ADD + i * GREEN2_MUL) >> 8;
LUT_gray_char[i] = LUT_gray_int[i] > 255 ? 255 : LUT_gray_int[i];
LUT_15_red[i] = (i & 0xf8) << 7; /* bits -rrrrr-- -------- */
LUT_15_green[i] = (i & 0xf8) << 2; /* bits------gg ggg----- */
LUT_15_blue[i] = (i & 0xf8) >> 3; /* bits-------- ---bbbbb */
LUT_16_red[i] = (i & 0xf8) << 8; /* bits rrrrr--- -------- */
LUT_16_green[i] = (i & 0xfc) << 3; /* bits -----ggg ggg----- */
LUT_16_blue[i] = (i & 0xf8) >> 3; /* bits -------- ---bbbbb */
LUT_24_red[i] = i << 16; /* byte -r-- */
LUT_24_green[i] = i << 8; /* byte --g- */
LUT_24_blue[i] = i; /* byte ---b */
}
for (i = 0; i < RANGE; i++)
LUT_range[i] = 0;
for (; i < RANGE + 256; i++)
LUT_range[i] = i - RANGE;
for (; i < 2 * RANGE + 256; i++)
LUT_range[i] = 255;
}
void
pcd_set_lookup(struct PCD_IMAGE *img, uint32_t *red,
uint32_t *green, uint32_t *blue)
{
img->lut_red = red;
img->lut_green = green;
img->lut_blue = blue;
}
/* ------------------------------------------------------------------------ */
#define GET_RED (LUT_range[RANGE + gray + \
LUT_red[red[x]]])
#define GET_GREEN (LUT_range[RANGE + gray + \
LUT_green1[red[x]] + \
LUT_green2[blue[x]]])
#define GET_BLUE (LUT_range[RANGE + gray + \
LUT_blue[blue[x]]])
static int
pcd_get_image_line_0(struct PCD_IMAGE *img, int y,
unsigned char *dest, int type, int scale)
{
unsigned char red[3072];
unsigned char blue[3072];
int bytes, maxx;
switch (type) {
case PCD_TYPE_GRAY:
bytes = 1;
break;
case PCD_TYPE_RGB:
bytes = 3;
break;
case PCD_TYPE_BGR:
bytes = 3;
break;
case PCD_TYPE_LUT_SHORT:
bytes = 2;
break;
case PCD_TYPE_LUT_LONG:
bytes = 4;
break;
default:
fprintf(stderr, "Oops: invalid type (%i) for output format\n", type);
exit(1);
}
if (img->rot & 2) {
y = (img->height >> scale) - y - 1;
dest += ((img->width >> scale) - 1) * bytes;
bytes = -bytes;
}
if (type != PCD_TYPE_GRAY && !scale) {
register int x;
register unsigned char *src1, *src2;
maxx = (img->width >> 1) - 1;
if (y & 1) {
src1 = img->blue[y >> 1];
src2 = img->blue[(y + 1 == img->height ? y : y + 1) >> 1];
for (x = 0; x < maxx; x++) {
blue[x * 2] = (src1[x] + src2[x] + 1) >> 1;
blue[x * 2 + 1] = (src1[x] + src1[x + 1] + src2[x] + src2[x + 1] + 2) >> 2;
}
blue[x * 2 + 1] = blue[x * 2] = (src1[x] + src2[x] + 1) >> 1;
src1 = img->red[y >> 1];
src2 = img->red[(y + 1 == img->height ? y : y + 1) >> 1];
for (x = 0; x < maxx; x++) {
red[x * 2] = (src1[x] + src2[x] + 1) >> 1;
red[x * 2 + 1] = (src1[x] + src1[x + 1] + src2[x] + src2[x + 1] + 2) >> 2;
}
red[x * 2 + 1] = red[x * 2] = (src1[x] + src2[x] + 1) >> 1;
} else {
src1 = img->blue[y >> 1];
for (x = 0; x < maxx; x++) {
blue[x * 2] = src1[x];
blue[x * 2 + 1] = (src1[x] + src1[x + 1] + 1) >> 1;
}
blue[x * 2 + 1] = blue[x * 2] = src1[x];
src1 = img->red[y >> 1];
for (x = 0; x < maxx; x++) {
red[x * 2] = src1[x];
red[x * 2 + 1] = (src1[x] + src1[x + 1] + 1) >> 1;
}
red[x * 2 + 1] = red[x * 2] = src1[x];
}
}
if (type != PCD_TYPE_GRAY && scale) {
memcpy(blue, img->blue[y], img->width >> 1);
memcpy(red, img->red[y], img->width >> 1);
}
maxx = img->width >> scale;
switch (type) {
case PCD_TYPE_GRAY:
{
register int x;
register unsigned char *luma = img->luma[y << scale];
for (x = 0; x < maxx; x++, dest += bytes)
*dest = LUT_gray_char[luma[x << scale]];
}
break;
case PCD_TYPE_RGB:
{
register int x, gray;
register unsigned char *luma = img->luma[y << scale];
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale]];
dest[0] = GET_RED;
dest[1] = GET_GREEN;
dest[2] = GET_BLUE;
}
}
break;
case PCD_TYPE_BGR:
{
register int x, gray;
register unsigned char *luma = img->luma[y << scale];
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale]];
dest[0] = GET_BLUE;
dest[1] = GET_GREEN;
dest[2] = GET_RED;
}
}
break;
case PCD_TYPE_LUT_SHORT:
{
register int x, gray;
register unsigned char *luma = img->luma[y << scale];
uint32_t *lr = img->lut_red;
uint32_t *lg = img->lut_green;
uint32_t *lb = img->lut_blue;
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale]];
*((uint16_t *) dest) =
lr[GET_RED] | lg[GET_GREEN] | lb[GET_BLUE];
}
}
break;
case PCD_TYPE_LUT_LONG:
{
register int x, gray;
register unsigned char *luma = img->luma[y << scale];
uint32_t *lr = img->lut_red;
uint32_t *lg = img->lut_green;
uint32_t *lb = img->lut_blue;
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale]];
*((uint32_t *) dest) =
lr[GET_RED] | lg[GET_GREEN] | lb[GET_BLUE];
}
}
break;
default:
exit(1);
}
return 0;
}
static int
pcd_get_image_line_90(struct PCD_IMAGE *img, int y,
unsigned char *dest, int type, int scale)
{
unsigned char red[3072];
unsigned char blue[3072];
unsigned char **luma = img->luma;
int bytes, maxx, y1, y2;
switch (type) {
case PCD_TYPE_GRAY:
bytes = 1;
break;
case PCD_TYPE_RGB:
bytes = 3;
break;
case PCD_TYPE_BGR:
bytes = 3;
break;
case PCD_TYPE_LUT_SHORT:
bytes = 2;
break;
case PCD_TYPE_LUT_LONG:
bytes = 4;
break;
default:
fprintf(stderr, "Oops: invalid type (%i) for output format\n", type);
exit(1);
}
if (!(img->rot & 2)) {
y = (img->width >> scale) - y - 1;
} else {
dest += ((img->height >> scale) - 1) * bytes;
bytes = -bytes;
}
if (type != PCD_TYPE_GRAY && !scale) {
register int x;
register unsigned char **src;
y1 = y >> 1;
y2 = (y + 1 == img->width ? y : y + 1) >> 1;
maxx = (img->height >> 1) - 1;
if (y & 1) {
src = img->blue;
for (x = 0; x < maxx; x++) {
blue[x * 2] = (src[x][y1] + src[x][y2] + 1) >> 1;
blue[x * 2 + 1] = (src[x][y1] + src[x][y2] +
src[x + 1][y1] + src[x + 1][y2] + 2) >> 2;
}
blue[x * 2 + 1] = blue[x * 2] = (src[x][y1] + src[x][y2] + 1) >> 1;
src = img->red;
for (x = 0; x < maxx; x++) {
red[x * 2] = (src[x][y1] + src[x][y2] + 1) >> 1;
red[x * 2 + 1] = (src[x][y1] + src[x][y2] +
src[x + 1][y1] + src[x + 1][y2] + 2) >> 2;
}
red[x * 2 + 1] = red[x * 2] = (src[x][y1] + src[x][y2] + 1) >> 1;
} else {
src = img->blue;
for (x = 0; x < maxx; x++) {
blue[x * 2] = src[x][y1];
blue[x * 2 + 1] = (src[x][y1] + src[x + 1][y1] + 1) >> 1;
}
blue[x * 2 + 1] = blue[x * 2] = src[x][y1];
src = img->red;
for (x = 0; x < maxx; x++) {
red[x * 2] = src[x][y1];
red[x * 2 + 1] = (src[x][y1] + src[x + 1][y1] + 1) >> 1;
}
red[x * 2 + 1] = red[x * 2] = src[x][y1];
}
}
if (type != PCD_TYPE_GRAY && scale) {
register int x;
register unsigned char **src;
maxx = (img->height >> 1);
src = img->blue;
for (x = 0; x < maxx; x++)
blue[x] = src[x][y];
src = img->red;
for (x = 0; x < maxx; x++)
red[x] = src[x][y];
}
maxx = (img->height >> scale);
switch (type) {
case PCD_TYPE_GRAY:
{
register int x;
for (x = 0; x < maxx; x++, dest += bytes)
*dest = LUT_gray_char[luma[x << scale][y << scale]];
}
break;
case PCD_TYPE_RGB:
{
register int x, gray;
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale][y << scale]];
dest[0] = GET_RED;
dest[1] = GET_GREEN;
dest[2] = GET_BLUE;
}
}
break;
case PCD_TYPE_BGR:
{
register int x, gray;
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale][y << scale]];
dest[0] = GET_BLUE;
dest[1] = GET_GREEN;
dest[2] = GET_RED;
}
}
break;
case PCD_TYPE_LUT_SHORT:
{
register int x, gray;
uint32_t *lr = img->lut_red;
uint32_t *lg = img->lut_green;
uint32_t *lb = img->lut_blue;
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale][y << scale]];
*((uint16_t *) dest) =
lr[GET_RED] | lg[GET_GREEN] | lb[GET_BLUE];
}
}
break;
case PCD_TYPE_LUT_LONG:
{
register int x, gray;
uint32_t *lr = img->lut_red;
uint32_t *lg = img->lut_green;
uint32_t *lb = img->lut_blue;
for (x = 0; x < maxx; x++, dest += bytes) {
gray = LUT_gray_int[luma[x << scale][y << scale]];
*((uint32_t *) dest) =
lr[GET_RED] | lg[GET_GREEN] | lb[GET_BLUE];
}
}
break;
default:
exit(1);
}
return 0;
}
int
pcd_get_image_line(struct PCD_IMAGE *img, int y,
unsigned char *dest, int type, int scale)
{
if (img->res == 0) {
fprintf(stderr, "Oops: invalid res %i, have you called pcd_select()?\n",
img->res);
exit(1);
}
if (img->rot & 1)
return pcd_get_image_line_90(img, y, dest, type, scale);
else
return pcd_get_image_line_0(img, y, dest, type, scale);
}
int
pcd_get_image(struct PCD_IMAGE *img, unsigned char *dest, int type, int scale)
{
int y, maxx, maxy, bytes;
if (img->res == 0) {
fprintf(stderr, "Oops: invalid res %i, have you called pcd_select()?\n",
img->res);
exit(1);
}
switch (type) {
case PCD_TYPE_GRAY:
bytes = 1;
break;
case PCD_TYPE_RGB:
bytes = 3;
break;
case PCD_TYPE_BGR:
bytes = 3;
break;
case PCD_TYPE_LUT_SHORT:
bytes = 2;
break;
case PCD_TYPE_LUT_LONG:
bytes = 4;
break;
default:
fprintf(stderr, "Oops: invalid type (%i) for output format\n", type);
exit(1);
}
maxx = (img->rot & 1 ? img->height : img->width) >> scale;
maxy = (img->rot & 1 ? img->width : img->height) >> scale;
for (y = 0; y < maxy; y++, dest += bytes * maxx) {
ROTOR(y);
pcd_get_image_line(img, y, dest, type, scale);
}
TELL('*');
return 0;
}
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