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Copy pathsixel.c
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sixel.c
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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% SSSSS IIIII X X EEEEE L %
% SS I X X E L %
% SSS I X EEE L %
% SS I X X E L %
% SSSSS IIIII X X EEEEE LLLLL %
% %
% %
% Read/Write DEC SIXEL Format %
% %
% Software Design %
% Hayaki Saito %
% September 2014 %
% Based on kmiya's sixel (2014-03-28) %
% %
% %
% Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% http://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "MagickCore/studio.h"
#include "MagickCore/attribute.h"
#include "MagickCore/blob.h"
#include "MagickCore/blob-private.h"
#include "MagickCore/cache.h"
#include "MagickCore/color.h"
#include "MagickCore/color-private.h"
#include "MagickCore/colormap.h"
#include "MagickCore/colorspace.h"
#include "MagickCore/colorspace-private.h"
#include "MagickCore/exception.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/geometry.h"
#include "MagickCore/image.h"
#include "MagickCore/image-private.h"
#include "MagickCore/list.h"
#include "MagickCore/magick.h"
#include "MagickCore/memory_.h"
#include "MagickCore/monitor.h"
#include "MagickCore/monitor-private.h"
#include "MagickCore/pixel-accessor.h"
#include "MagickCore/pixel-private.h"
#include "MagickCore/quantize.h"
#include "MagickCore/quantum-private.h"
#include "MagickCore/resize.h"
#include "MagickCore/resource_.h"
#include "MagickCore/splay-tree.h"
#include "MagickCore/static.h"
#include "MagickCore/string_.h"
#include "MagickCore/thread-private.h"
#include "MagickCore/module.h"
#include "MagickCore/threshold.h"
#include "MagickCore/utility.h"
/*
Definitions
*/
#define SIXEL_PALETTE_MAX 256
#define SIXEL_OUTPUT_PACKET_SIZE 1024
/*
Macros
*/
#define SIXEL_RGB(r, g, b) (((r) << 16) + ((g) << 8) + (b))
#define SIXEL_PALVAL(n,a,m) (((n) * (a) + ((m) / 2)) / (m))
#define SIXEL_XRGB(r,g,b) SIXEL_RGB(SIXEL_PALVAL(r, 255, 100), SIXEL_PALVAL(g, 255, 100), SIXEL_PALVAL(b, 255, 100))
/*
Structure declarations.
*/
typedef struct sixel_node {
struct sixel_node *next;
int color;
int left;
int right;
unsigned char *map;
} sixel_node_t;
typedef struct sixel_output {
/* compatiblity flags */
/* 0: 7bit terminal,
* 1: 8bit terminal */
unsigned char has_8bit_control;
int save_pixel;
int save_count;
int active_palette;
sixel_node_t *node_top;
sixel_node_t *node_free;
Image *image;
int pos;
unsigned char buffer[1];
} sixel_output_t;
static int const sixel_default_color_table[] = {
SIXEL_XRGB(0, 0, 0), /* 0 Black */
SIXEL_XRGB(20, 20, 80), /* 1 Blue */
SIXEL_XRGB(80, 13, 13), /* 2 Red */
SIXEL_XRGB(20, 80, 20), /* 3 Green */
SIXEL_XRGB(80, 20, 80), /* 4 Magenta */
SIXEL_XRGB(20, 80, 80), /* 5 Cyan */
SIXEL_XRGB(80, 80, 20), /* 6 Yellow */
SIXEL_XRGB(53, 53, 53), /* 7 Gray 50% */
SIXEL_XRGB(26, 26, 26), /* 8 Gray 25% */
SIXEL_XRGB(33, 33, 60), /* 9 Blue* */
SIXEL_XRGB(60, 26, 26), /* 10 Red* */
SIXEL_XRGB(33, 60, 33), /* 11 Green* */
SIXEL_XRGB(60, 33, 60), /* 12 Magenta* */
SIXEL_XRGB(33, 60, 60), /* 13 Cyan* */
SIXEL_XRGB(60, 60, 33), /* 14 Yellow* */
SIXEL_XRGB(80, 80, 80), /* 15 Gray 75% */
};
/*
Forward declarations.
*/
static MagickBooleanType
WriteSIXELImage(const ImageInfo *,Image *,ExceptionInfo *);
static int hue_to_rgb(int n1, int n2, int hue)
{
const int HLSMAX = 100;
if (hue < 0) {
hue += HLSMAX;
}
if (hue > HLSMAX) {
hue -= HLSMAX;
}
if (hue < (HLSMAX / 6)) {
return (n1 + (((n2 - n1) * hue + (HLSMAX / 12)) / (HLSMAX / 6)));
}
if (hue < (HLSMAX / 2)) {
return (n2);
}
if (hue < ((HLSMAX * 2) / 3)) {
return (n1 + (((n2 - n1) * (((HLSMAX * 2) / 3) - hue) + (HLSMAX / 12))/(HLSMAX / 6)));
}
return (n1);
}
static int hls_to_rgb(int hue, int lum, int sat)
{
int R, G, B;
int Magic1, Magic2;
const int RGBMAX = 255;
const int HLSMAX = 100;
if (sat == 0) {
R = G = B = (lum * RGBMAX) / HLSMAX;
} else {
if (lum <= (HLSMAX / 2)) {
Magic2 = (lum * (HLSMAX + sat) + (HLSMAX / 2)) / HLSMAX;
} else {
Magic2 = lum + sat - ((lum * sat) + (HLSMAX / 2)) / HLSMAX;
}
Magic1 = 2 * lum - Magic2;
R = (hue_to_rgb(Magic1, Magic2, hue + (HLSMAX / 3)) * RGBMAX + (HLSMAX / 2)) / HLSMAX;
G = (hue_to_rgb(Magic1, Magic2, hue) * RGBMAX + (HLSMAX / 2)) / HLSMAX;
B = (hue_to_rgb(Magic1, Magic2, hue - (HLSMAX / 3)) * RGBMAX + (HLSMAX/2)) / HLSMAX;
}
return SIXEL_RGB(R, G, B);
}
static unsigned char *get_params(unsigned char *p, int *param, int *len)
{
int n;
*len = 0;
while (*p != '\0') {
while (*p == ' ' || *p == '\t') {
p++;
}
if (isdigit(*p)) {
for (n = 0; isdigit(*p); p++) {
n = n * 10 + (*p - '0');
}
if (*len < 10) {
param[(*len)++] = n;
}
while (*p == ' ' || *p == '\t') {
p++;
}
if (*p == ';') {
p++;
}
} else if (*p == ';') {
if (*len < 10) {
param[(*len)++] = 0;
}
p++;
} else
break;
}
return p;
}
/* convert sixel data into indexed pixel bytes and palette data */
MagickBooleanType sixel_decode(unsigned char /* in */ *p, /* sixel bytes */
unsigned char /* out */ **pixels, /* decoded pixels */
size_t /* out */ *pwidth, /* image width */
size_t /* out */ *pheight, /* image height */
unsigned char /* out */ **palette, /* ARGB palette */
size_t /* out */ *ncolors /* palette size (<= 256) */)
{
int n, i, r, g, b, sixel_vertical_mask, c;
int posision_x, posision_y;
int max_x, max_y;
int attributed_pan, attributed_pad;
int attributed_ph, attributed_pv;
int repeat_count, color_index, max_color_index = 2, background_color_index;
int param[10];
int sixel_palet[SIXEL_PALETTE_MAX];
unsigned char *imbuf, *dmbuf;
int imsx, imsy;
int dmsx, dmsy;
int y;
posision_x = posision_y = 0;
max_x = max_y = 0;
attributed_pan = 2;
attributed_pad = 1;
attributed_ph = attributed_pv = 0;
repeat_count = 1;
color_index = 0;
background_color_index = 0;
imsx = 2048;
imsy = 2048;
imbuf = (unsigned char *) AcquireQuantumMemory(imsx * imsy,1);
if (imbuf == NULL) {
return(MagickFalse);
}
for (n = 0; n < 16; n++) {
sixel_palet[n] = sixel_default_color_table[n];
}
/* colors 16-231 are a 6x6x6 color cube */
for (r = 0; r < 6; r++) {
for (g = 0; g < 6; g++) {
for (b = 0; b < 6; b++) {
sixel_palet[n++] = SIXEL_RGB(r * 51, g * 51, b * 51);
}
}
}
/* colors 232-255 are a grayscale ramp, intentionally leaving out */
for (i = 0; i < 24; i++) {
sixel_palet[n++] = SIXEL_RGB(i * 11, i * 11, i * 11);
}
for (; n < SIXEL_PALETTE_MAX; n++) {
sixel_palet[n] = SIXEL_RGB(255, 255, 255);
}
(void) ResetMagickMemory(imbuf, background_color_index, imsx * imsy);
while (*p != '\0') {
if ((p[0] == '\033' && p[1] == 'P') || *p == 0x90) {
if (*p == '\033') {
p++;
}
p = get_params(++p, param, &n);
if (*p == 'q') {
p++;
if (n > 0) { /* Pn1 */
switch(param[0]) {
case 0:
case 1:
attributed_pad = 2;
break;
case 2:
attributed_pad = 5;
break;
case 3:
attributed_pad = 4;
break;
case 4:
attributed_pad = 4;
break;
case 5:
attributed_pad = 3;
break;
case 6:
attributed_pad = 3;
break;
case 7:
attributed_pad = 2;
break;
case 8:
attributed_pad = 2;
break;
case 9:
attributed_pad = 1;
break;
}
}
if (n > 2) { /* Pn3 */
if (param[2] == 0) {
param[2] = 10;
}
attributed_pan = attributed_pan * param[2] / 10;
attributed_pad = attributed_pad * param[2] / 10;
if (attributed_pan <= 0) attributed_pan = 1;
if (attributed_pad <= 0) attributed_pad = 1;
}
}
} else if ((p[0] == '\033' && p[1] == '\\') || *p == 0x9C) {
break;
} else if (*p == '"') {
/* DECGRA Set Raster Attributes " Pan; Pad; Ph; Pv */
p = get_params(++p, param, &n);
if (n > 0) attributed_pad = param[0];
if (n > 1) attributed_pan = param[1];
if (n > 2 && param[2] > 0) attributed_ph = param[2];
if (n > 3 && param[3] > 0) attributed_pv = param[3];
if (attributed_pan <= 0) attributed_pan = 1;
if (attributed_pad <= 0) attributed_pad = 1;
if (imsx < attributed_ph || imsy < attributed_pv) {
dmsx = imsx > attributed_ph ? imsx : attributed_ph;
dmsy = imsy > attributed_pv ? imsy : attributed_pv;
dmbuf = (unsigned char *) AcquireQuantumMemory(dmsx * dmsy,1);
if (dmbuf == (unsigned char *) NULL) {
imbuf = (unsigned char *) RelinquishMagickMemory(imbuf);
return (MagickFalse);
}
(void) ResetMagickMemory(dmbuf, background_color_index, dmsx * dmsy);
for (y = 0; y < imsy; ++y) {
(void) CopyMagickMemory(dmbuf + dmsx * y, imbuf + imsx * y, imsx);
}
imbuf = (unsigned char *) RelinquishMagickMemory(imbuf);
imsx = dmsx;
imsy = dmsy;
imbuf = dmbuf;
}
} else if (*p == '!') {
/* DECGRI Graphics Repeat Introducer ! Pn Ch */
p = get_params(++p, param, &n);
if (n > 0) {
repeat_count = param[0];
}
} else if (*p == '#') {
/* DECGCI Graphics Color Introducer # Pc; Pu; Px; Py; Pz */
p = get_params(++p, param, &n);
if (n > 0) {
if ((color_index = param[0]) < 0) {
color_index = 0;
} else if (color_index >= SIXEL_PALETTE_MAX) {
color_index = SIXEL_PALETTE_MAX - 1;
}
}
if (n > 4) {
if (param[1] == 1) { /* HLS */
if (param[2] > 360) param[2] = 360;
if (param[3] > 100) param[3] = 100;
if (param[4] > 100) param[4] = 100;
sixel_palet[color_index] = hls_to_rgb(param[2] * 100 / 360, param[3], param[4]);
} else if (param[1] == 2) { /* RGB */
if (param[2] > 100) param[2] = 100;
if (param[3] > 100) param[3] = 100;
if (param[4] > 100) param[4] = 100;
sixel_palet[color_index] = SIXEL_XRGB(param[2], param[3], param[4]);
}
}
} else if (*p == '$') {
/* DECGCR Graphics Carriage Return */
p++;
posision_x = 0;
repeat_count = 1;
} else if (*p == '-') {
/* DECGNL Graphics Next Line */
p++;
posision_x = 0;
posision_y += 6;
repeat_count = 1;
} else if (*p >= '?' && *p <= '\177') {
if (imsx < (posision_x + repeat_count) || imsy < (posision_y + 6)) {
int nx = imsx * 2;
int ny = imsy * 2;
while (nx < (posision_x + repeat_count) || ny < (posision_y + 6)) {
nx *= 2;
ny *= 2;
}
dmsx = nx;
dmsy = ny;
dmbuf = (unsigned char *) AcquireQuantumMemory(dmsx * dmsy,1);
if (dmbuf == (unsigned char *) NULL) {
imbuf = (unsigned char *) RelinquishMagickMemory(imbuf);
return (MagickFalse);
}
(void) ResetMagickMemory(dmbuf, background_color_index, dmsx * dmsy);
for (y = 0; y < imsy; ++y) {
(void) CopyMagickMemory(dmbuf + dmsx * y, imbuf + imsx * y, imsx);
}
imbuf = (unsigned char *) RelinquishMagickMemory(imbuf);
imsx = dmsx;
imsy = dmsy;
imbuf = dmbuf;
}
if (color_index > max_color_index) {
max_color_index = color_index;
}
if ((b = *(p++) - '?') == 0) {
posision_x += repeat_count;
} else {
sixel_vertical_mask = 0x01;
if (repeat_count <= 1) {
for (i = 0; i < 6; i++) {
if ((b & sixel_vertical_mask) != 0) {
imbuf[imsx * (posision_y + i) + posision_x] = color_index;
if (max_x < posision_x) {
max_x = posision_x;
}
if (max_y < (posision_y + i)) {
max_y = posision_y + i;
}
}
sixel_vertical_mask <<= 1;
}
posision_x += 1;
} else { /* repeat_count > 1 */
for (i = 0; i < 6; i++) {
if ((b & sixel_vertical_mask) != 0) {
c = sixel_vertical_mask << 1;
for (n = 1; (i + n) < 6; n++) {
if ((b & c) == 0) {
break;
}
c <<= 1;
}
for (y = posision_y + i; y < posision_y + i + n; ++y) {
(void) ResetMagickMemory(imbuf + imsx * y + posision_x, color_index, repeat_count);
}
if (max_x < (posision_x + repeat_count - 1)) {
max_x = posision_x + repeat_count - 1;
}
if (max_y < (posision_y + i + n - 1)) {
max_y = posision_y + i + n - 1;
}
i += (n - 1);
sixel_vertical_mask <<= (n - 1);
}
sixel_vertical_mask <<= 1;
}
posision_x += repeat_count;
}
}
repeat_count = 1;
} else {
p++;
}
}
if (++max_x < attributed_ph) {
max_x = attributed_ph;
}
if (++max_y < attributed_pv) {
max_y = attributed_pv;
}
if (imsx > max_x || imsy > max_y) {
dmsx = max_x;
dmsy = max_y;
if ((dmbuf = (unsigned char *) AcquireQuantumMemory(dmsx * dmsy,1)) == NULL) {
imbuf = (unsigned char *) RelinquishMagickMemory(imbuf);
return (MagickFalse);
}
for (y = 0; y < dmsy; ++y) {
(void) CopyMagickMemory(dmbuf + dmsx * y, imbuf + imsx * y, dmsx);
}
imbuf = (unsigned char *) RelinquishMagickMemory(imbuf);
imsx = dmsx;
imsy = dmsy;
imbuf = dmbuf;
}
*pixels = imbuf;
*pwidth = imsx;
*pheight = imsy;
*ncolors = max_color_index + 1;
*palette = (unsigned char *) AcquireQuantumMemory(*ncolors,4);
for (n = 0; n < (ssize_t) *ncolors; ++n) {
(*palette)[n * 4 + 0] = sixel_palet[n] >> 16 & 0xff;
(*palette)[n * 4 + 1] = sixel_palet[n] >> 8 & 0xff;
(*palette)[n * 4 + 2] = sixel_palet[n] & 0xff;
(*palette)[n * 4 + 3] = 0xff;
}
return(MagickTrue);
}
sixel_output_t *sixel_output_create(Image *image)
{
sixel_output_t *output;
output = (sixel_output_t *) AcquireQuantumMemory(sizeof(sixel_output_t) + SIXEL_OUTPUT_PACKET_SIZE * 2, 1);
output->has_8bit_control = 0;
output->save_pixel = 0;
output->save_count = 0;
output->active_palette = (-1);
output->node_top = NULL;
output->node_free = NULL;
output->image = image;
output->pos = 0;
return output;
}
static void sixel_advance(sixel_output_t *context, int nwrite)
{
if ((context->pos += nwrite) >= SIXEL_OUTPUT_PACKET_SIZE) {
WriteBlob(context->image,SIXEL_OUTPUT_PACKET_SIZE,context->buffer);
CopyMagickMemory(context->buffer,
context->buffer + SIXEL_OUTPUT_PACKET_SIZE,
(context->pos -= SIXEL_OUTPUT_PACKET_SIZE));
}
}
static int sixel_put_flash(sixel_output_t *const context)
{
int n;
int nwrite;
#if defined(USE_VT240) /* VT240 Max 255 ? */
while (context->save_count > 255) {
nwrite = spritf((char *)context->buffer + context->pos, "!255%c", context->save_pixel);
if (nwrite <= 0) {
return (-1);
}
sixel_advance(context, nwrite);
context->save_count -= 255;
}
#endif /* defined(USE_VT240) */
if (context->save_count > 3) {
/* DECGRI Graphics Repeat Introducer ! Pn Ch */
nwrite = sprintf((char *)context->buffer + context->pos, "!%d%c", context->save_count, context->save_pixel);
if (nwrite <= 0) {
return (-1);
}
sixel_advance(context, nwrite);
} else {
for (n = 0; n < context->save_count; n++) {
context->buffer[context->pos] = (char)context->save_pixel;
sixel_advance(context, 1);
}
}
context->save_pixel = 0;
context->save_count = 0;
return 0;
}
static void sixel_put_pixel(sixel_output_t *const context, int pix)
{
if (pix < 0 || pix > '?') {
pix = 0;
}
pix += '?';
if (pix == context->save_pixel) {
context->save_count++;
} else {
sixel_put_flash(context);
context->save_pixel = pix;
context->save_count = 1;
}
}
static void sixel_node_del(sixel_output_t *const context, sixel_node_t *np)
{
sixel_node_t *tp;
if ((tp = context->node_top) == np) {
context->node_top = np->next;
}
else {
while (tp->next != NULL) {
if (tp->next == np) {
tp->next = np->next;
break;
}
tp = tp->next;
}
}
np->next = context->node_free;
context->node_free = np;
}
static int sixel_put_node(sixel_output_t *const context, int x,
sixel_node_t *np, int ncolors, int keycolor)
{
int nwrite;
if (ncolors != 2 || keycolor == -1) {
/* designate palette index */
if (context->active_palette != np->color) {
nwrite = sprintf((char *)context->buffer + context->pos,
"#%d", np->color);
sixel_advance(context, nwrite);
context->active_palette = np->color;
}
}
for (; x < np->left; x++) {
sixel_put_pixel(context, 0);
}
for (; x < np->right; x++) {
sixel_put_pixel(context, np->map[x]);
}
sixel_put_flash(context);
return x;
}
static MagickBooleanType sixel_encode_impl(unsigned char *pixels, size_t width,size_t height,
unsigned char *palette, size_t ncolors, int keycolor,
sixel_output_t *context)
{
#define RelinquishNodesAndMap \
while ((np = context->node_free) != NULL) { \
context->node_free = np->next; \
np=(sixel_node_t *) RelinquishMagickMemory(np); \
} \
map = (unsigned char *) RelinquishMagickMemory(map)
int x, y, i, n, c;
int left, right;
int pix;
unsigned char *map;
sixel_node_t *np, *tp, top;
int nwrite;
size_t len;
context->pos = 0;
if (ncolors < 1) {
return (MagickFalse);
}
len = ncolors * width;
context->active_palette = (-1);
if ((map = (unsigned char *)AcquireQuantumMemory(len, sizeof(unsigned char))) == NULL) {
return (MagickFalse);
}
(void) ResetMagickMemory(map, 0, len);
if (context->has_8bit_control) {
nwrite = sprintf((char *)context->buffer, "\x90" "0;0;0" "q");
} else {
nwrite = sprintf((char *)context->buffer, "\x1bP" "0;0;0" "q");
}
if (nwrite <= 0) {
return (MagickFalse);
}
sixel_advance(context, nwrite);
nwrite = sprintf((char *)context->buffer + context->pos, "\"1;1;%d;%d", (int) width, (int) height);
if (nwrite <= 0) {
RelinquishNodesAndMap;
return (MagickFalse);
}
sixel_advance(context, nwrite);
if (ncolors != 2 || keycolor == -1) {
for (n = 0; n < (ssize_t) ncolors; n++) {
/* DECGCI Graphics Color Introducer # Pc ; Pu; Px; Py; Pz */
nwrite = sprintf((char *)context->buffer + context->pos, "#%d;2;%d;%d;%d",
n,
(palette[n * 3 + 0] * 100 + 127) / 255,
(palette[n * 3 + 1] * 100 + 127) / 255,
(palette[n * 3 + 2] * 100 + 127) / 255);
if (nwrite <= 0) {
RelinquishNodesAndMap;
return (MagickFalse);
}
sixel_advance(context, nwrite);
if (nwrite <= 0) {
RelinquishNodesAndMap;
return (MagickFalse);
}
}
}
for (y = i = 0; y < (ssize_t) height; y++) {
for (x = 0; x < (ssize_t) width; x++) {
pix = pixels[y * width + x];
if (pix >= 0 && pix < (ssize_t) ncolors && pix != keycolor) {
map[pix * width + x] |= (1 << i);
}
}
if (++i < 6 && (y + 1) < (ssize_t) height) {
continue;
}
for (c = 0; c < (ssize_t) ncolors; c++) {
for (left = 0; left < (ssize_t) width; left++) {
if (*(map + c * width + left) == 0) {
continue;
}
for (right = left + 1; right < (ssize_t) width; right++) {
if (*(map + c * width + right) != 0) {
continue;
}
for (n = 1; (right + n) < (ssize_t) width; n++) {
if (*(map + c * width + right + n) != 0) {
break;
}
}
if (n >= 10 || right + n >= (ssize_t) width) {
break;
}
right = right + n - 1;
}
if ((np = context->node_free) != NULL) {
context->node_free = np->next;
} else if ((np = (sixel_node_t *)AcquireMagickMemory(sizeof(sixel_node_t))) == NULL) {
RelinquishNodesAndMap;
return (MagickFalse);
}
np->color = c;
np->left = left;
np->right = right;
np->map = map + c * width;
top.next = context->node_top;
tp = ⊤
while (tp->next != NULL) {
if (np->left < tp->next->left) {
break;
}
if (np->left == tp->next->left && np->right > tp->next->right) {
break;
}
tp = tp->next;
}
np->next = tp->next;
tp->next = np;
context->node_top = top.next;
left = right - 1;
}
}
for (x = 0; (np = context->node_top) != NULL;) {
if (x > np->left) {
/* DECGCR Graphics Carriage Return */
context->buffer[context->pos] = '$';
sixel_advance(context, 1);
x = 0;
}
x = sixel_put_node(context, x, np, (int) ncolors, keycolor);
sixel_node_del(context, np);
np = context->node_top;
while (np != NULL) {
if (np->left < x) {
np = np->next;
continue;
}
x = sixel_put_node(context, x, np, (int) ncolors, keycolor);
sixel_node_del(context, np);
np = context->node_top;
}
}
/* DECGNL Graphics Next Line */
context->buffer[context->pos] = '-';
sixel_advance(context, 1);
if (nwrite <= 0) {
RelinquishNodesAndMap;
return (MagickFalse);
}
i = 0;
(void) ResetMagickMemory(map, 0, len);
}
if (context->has_8bit_control) {
context->buffer[context->pos] = 0x9c;
sixel_advance(context, 1);
} else {
context->buffer[context->pos] = 0x1b;
context->buffer[context->pos + 1] = '\\';
sixel_advance(context, 2);
}
if (nwrite <= 0) {
RelinquishNodesAndMap;
return (MagickFalse);
}
/* flush buffer */
if (context->pos > 0) {
WriteBlob(context->image,context->pos,context->buffer);
}
RelinquishNodesAndMap;
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s S I X E L %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsSIXEL() returns MagickTrue if the image format type, identified by the
% magick string, is SIXEL.
%
% The format of the IsSIXEL method is:
%
% MagickBooleanType IsSIXEL(const unsigned char *magick,
% const size_t length)
%
% A description of each parameter follows:
%
% o magick: compare image format pattern against these bytes. or
% blob.
%
% o length: Specifies the length of the magick string.
%
*/
static MagickBooleanType IsSIXEL(const unsigned char *magick,
const size_t length)
{
const unsigned char
*end = magick + length;
if (length < 3)
return(MagickFalse);
if (*magick == 0x90 || (*magick == 0x1b && *++magick == 'P')) {
while (++magick != end) {
if (*magick == 'q')
return(MagickTrue);
if (!(*magick >= '0' && *magick <= '9') && *magick != ';')
return(MagickFalse);
}
}
return(MagickFalse);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d S I X E L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadSIXELImage() reads an X11 pixmap image file and returns it. It
% allocates the memory necessary for the new Image structure and returns a
% pointer to the new image.
%
% The format of the ReadSIXELImage method is:
%
% Image *ReadSIXELImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: the image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadSIXELImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
char
*sixel_buffer;
Image
*image;
MagickBooleanType
status;
register char
*p;
register ssize_t
x;
register Quantum
*q;
size_t
length;
ssize_t
i,
j,
y;
unsigned char
*sixel_pixels,
*sixel_palette;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickCoreSignature);
image=AcquireImage(image_info,exception);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
/*
Read SIXEL file.
*/
length=MagickPathExtent;
sixel_buffer=(char *) AcquireQuantumMemory((size_t) length,
sizeof(*sixel_buffer));
p=sixel_buffer;