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/* ... */
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#ifdef QUANT_2PASS_SUPPORTED
/* ... */
#define R_SCALE 2
#define G_SCALE 3
#define B_SCALE 1
/* ... */
#if RGB_RED == 0
#define C0_SCALE R_SCALE
#endif
#if RGB_BLUE == 0
#define C0_SCALE B_SCALE
#endif
#if RGB_GREEN == 1
#define C1_SCALE G_SCALE
#endif
#if RGB_RED == 2
#define C2_SCALE R_SCALE
#endif
#if RGB_BLUE == 2
#define C2_SCALE B_SCALE
#endif
/* ... */
#define MAXNUMCOLORS (MAXJSAMPLE+1)
/* ... */
#define HIST_C0_BITS 5
#define HIST_C1_BITS 6
#define HIST_C2_BITS 5
#define HIST_C0_ELEMS (1<<HIST_C0_BITS)
#define HIST_C1_ELEMS (1<<HIST_C1_BITS)
#define HIST_C2_ELEMS (1<<HIST_C2_BITS)
#define C0_SHIFT (BITS_IN_JSAMPLE-HIST_C0_BITS)
#define C1_SHIFT (BITS_IN_JSAMPLE-HIST_C1_BITS)
#define C2_SHIFT (BITS_IN_JSAMPLE-HIST_C2_BITS)
10 defines
typedef UINT16 histcell;
typedef histcell FAR * histptr;
typedef histcell hist1d[HIST_C2_ELEMS];
typedef hist1d FAR * hist2d;
typedef hist2d * hist3d;
/* ... */
#if BITS_IN_JSAMPLE == 8
typedef INT16 FSERROR;
typedef int LOCFSERROR; /* ... */
#else
typedef INT32 FSERROR;
typedef INT32 LOCFSERROR; /* ... */
#endif
typedef FSERROR FAR *FSERRPTR;
typedef struct {
struct jpeg_color_quantizer pub;
JSAMPARRAY sv_colormap;
int desired;
hist3d histogram;
boolean needs_zeroed;
FSERRPTR fserrors;
boolean on_odd_row;
int * error_limiter;
...} my_cquantizer;
typedef my_cquantizer * my_cquantize_ptr;
/* ... */
METHODDEF(void)
prescan_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
JSAMPARRAY output_buf, int num_rows)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
register JSAMPROW ptr;
register histptr histp;
register hist3d histogram = cquantize->histogram;
int row;
JDIMENSION col;
JDIMENSION width = cinfo->output_width;
for (row = 0; row < num_rows; row++) {
ptr = input_buf[row];
for (col = width; col > 0; col--) {
histp = & histogram[GETJSAMPLE(ptr[0]) >> C0_SHIFT]
[GETJSAMPLE(ptr[1]) >> C1_SHIFT]
[GETJSAMPLE(ptr[2]) >> C2_SHIFT];
if (++(*histp) <= 0)
(*histp)--;
ptr += 3;
}for (col = width; col > 0; col--) { ... }
}for (row = 0; row < num_rows; row++) { ... }
}{ ... }
/* ... */
typedef struct {
int c0min, c0max;
int c1min, c1max;
int c2min, c2max;
INT32 volume;
long colorcount;
...} box;
typedef box * boxptr;
LOCAL(boxptr)
find_biggest_color_pop (boxptr boxlist, int numboxes)
{
register boxptr boxp;
register int i;
register long maxc = 0;
boxptr which = NULL;
for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) {
if (boxp->colorcount > maxc && boxp->volume > 0) {
which = boxp;
maxc = boxp->colorcount;
}if (boxp->colorcount > maxc && boxp->volume > 0) { ... }
}for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) { ... }
return which;
...}
LOCAL(boxptr)
find_biggest_volume (boxptr boxlist, int numboxes)
{
register boxptr boxp;
register int i;
register INT32 maxv = 0;
boxptr which = NULL;
for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) {
if (boxp->volume > maxv) {
which = boxp;
maxv = boxp->volume;
}if (boxp->volume > maxv) { ... }
}for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) { ... }
return which;
...}
LOCAL(void)
update_box (j_decompress_ptr cinfo, boxptr boxp)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
histptr histp;
int c0,c1,c2;
int c0min,c0max,c1min,c1max,c2min,c2max;
INT32 dist0,dist1,dist2;
long ccount;
c0min = boxp->c0min; c0max = boxp->c0max;
c1min = boxp->c1min; c1max = boxp->c1max;
c2min = boxp->c2min; c2max = boxp->c2max;
if (c0max > c0min)
for (c0 = c0min; c0 <= c0max; c0++)
for (c1 = c1min; c1 <= c1max; c1++) {
histp = & histogram[c0][c1][c2min];
for (c2 = c2min; c2 <= c2max; c2++)
if (*histp++ != 0) {
boxp->c0min = c0min = c0;
goto have_c0min;
}if (*histp++ != 0) { ... }
}for (c1 = c1min; c1 <= c1max; c1++) { ... }
have_c0min:
if (c0max > c0min)
for (c0 = c0max; c0 >= c0min; c0--)
for (c1 = c1min; c1 <= c1max; c1++) {
histp = & histogram[c0][c1][c2min];
for (c2 = c2min; c2 <= c2max; c2++)
if (*histp++ != 0) {
boxp->c0max = c0max = c0;
goto have_c0max;
}if (*histp++ != 0) { ... }
}for (c1 = c1min; c1 <= c1max; c1++) { ... }
have_c0max:
if (c1max > c1min)
for (c1 = c1min; c1 <= c1max; c1++)
for (c0 = c0min; c0 <= c0max; c0++) {
histp = & histogram[c0][c1][c2min];
for (c2 = c2min; c2 <= c2max; c2++)
if (*histp++ != 0) {
boxp->c1min = c1min = c1;
goto have_c1min;
}if (*histp++ != 0) { ... }
}for (c0 = c0min; c0 <= c0max; c0++) { ... }
have_c1min:
if (c1max > c1min)
for (c1 = c1max; c1 >= c1min; c1--)
for (c0 = c0min; c0 <= c0max; c0++) {
histp = & histogram[c0][c1][c2min];
for (c2 = c2min; c2 <= c2max; c2++)
if (*histp++ != 0) {
boxp->c1max = c1max = c1;
goto have_c1max;
}if (*histp++ != 0) { ... }
}for (c0 = c0min; c0 <= c0max; c0++) { ... }
have_c1max:
if (c2max > c2min)
for (c2 = c2min; c2 <= c2max; c2++)
for (c0 = c0min; c0 <= c0max; c0++) {
histp = & histogram[c0][c1min][c2];
for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS)
if (*histp != 0) {
boxp->c2min = c2min = c2;
goto have_c2min;
}if (*histp != 0) { ... }
}for (c0 = c0min; c0 <= c0max; c0++) { ... }
have_c2min:
if (c2max > c2min)
for (c2 = c2max; c2 >= c2min; c2--)
for (c0 = c0min; c0 <= c0max; c0++) {
histp = & histogram[c0][c1min][c2];
for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS)
if (*histp != 0) {
boxp->c2max = c2max = c2;
goto have_c2max;
}if (*histp != 0) { ... }
}for (c0 = c0min; c0 <= c0max; c0++) { ... }
have_c2max:
/* ... */
dist0 = ((c0max - c0min) << C0_SHIFT) * C0_SCALE;
dist1 = ((c1max - c1min) << C1_SHIFT) * C1_SCALE;
dist2 = ((c2max - c2min) << C2_SHIFT) * C2_SCALE;
boxp->volume = dist0*dist0 + dist1*dist1 + dist2*dist2;
ccount = 0;
for (c0 = c0min; c0 <= c0max; c0++)
for (c1 = c1min; c1 <= c1max; c1++) {
histp = & histogram[c0][c1][c2min];
for (c2 = c2min; c2 <= c2max; c2++, histp++)
if (*histp != 0) {
ccount++;
}if (*histp != 0) { ... }
}for (c1 = c1min; c1 <= c1max; c1++) { ... }
boxp->colorcount = ccount;
...}
LOCAL(int)
median_cut (j_decompress_ptr cinfo, boxptr boxlist, int numboxes,
int desired_colors)
{
int n,lb;
int c0,c1,c2,cmax;
register boxptr b1,b2;
while (numboxes < desired_colors) {
/* ... */
if (numboxes*2 <= desired_colors) {
b1 = find_biggest_color_pop(boxlist, numboxes);
}if (numboxes*2 <= desired_colors) { ... } else {
b1 = find_biggest_volume(boxlist, numboxes);
}else { ... }
if (b1 == NULL)
break;
b2 = &boxlist[numboxes];
b2->c0max = b1->c0max; b2->c1max = b1->c1max; b2->c2max = b1->c2max;
b2->c0min = b1->c0min; b2->c1min = b1->c1min; b2->c2min = b1->c2min;
/* ... */
c0 = ((b1->c0max - b1->c0min) << C0_SHIFT) * C0_SCALE;
c1 = ((b1->c1max - b1->c1min) << C1_SHIFT) * C1_SCALE;
c2 = ((b1->c2max - b1->c2min) << C2_SHIFT) * C2_SCALE;
/* ... */
#if RGB_RED == 0
cmax = c1; n = 1;
if (c0 > cmax) { cmax = c0; n = 0; }
if (c2 > cmax) { n = 2; }/* ... */
#else
cmax = c1; n = 1;
if (c2 > cmax) { cmax = c2; n = 2; }
if (c0 > cmax) { n = 0; }/* ... */
#endif
/* ... */
switch (n) {
case 0:
lb = (b1->c0max + b1->c0min) / 2;
b1->c0max = lb;
b2->c0min = lb+1;
break;case 0:
case 1:
lb = (b1->c1max + b1->c1min) / 2;
b1->c1max = lb;
b2->c1min = lb+1;
break;case 1:
case 2:
lb = (b1->c2max + b1->c2min) / 2;
b1->c2max = lb;
b2->c2min = lb+1;
break;case 2:
}switch (n) { ... }
update_box(cinfo, b1);
update_box(cinfo, b2);
numboxes++;
}while (numboxes < desired_colors) { ... }
return numboxes;
...}
LOCAL(void)
compute_color (j_decompress_ptr cinfo, boxptr boxp, int icolor)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
histptr histp;
int c0,c1,c2;
int c0min,c0max,c1min,c1max,c2min,c2max;
long count;
long total = 0;
long c0total = 0;
long c1total = 0;
long c2total = 0;
c0min = boxp->c0min; c0max = boxp->c0max;
c1min = boxp->c1min; c1max = boxp->c1max;
c2min = boxp->c2min; c2max = boxp->c2max;
for (c0 = c0min; c0 <= c0max; c0++)
for (c1 = c1min; c1 <= c1max; c1++) {
histp = & histogram[c0][c1][c2min];
for (c2 = c2min; c2 <= c2max; c2++) {
if ((count = *histp++) != 0) {
total += count;
c0total += ((c0 << C0_SHIFT) + ((1<<C0_SHIFT)>>1)) * count;
c1total += ((c1 << C1_SHIFT) + ((1<<C1_SHIFT)>>1)) * count;
c2total += ((c2 << C2_SHIFT) + ((1<<C2_SHIFT)>>1)) * count;
}if ((count = *histp++) != 0) { ... }
}for (c2 = c2min; c2 <= c2max; c2++) { ... }
}for (c1 = c1min; c1 <= c1max; c1++) { ... }
cinfo->colormap[0][icolor] = (JSAMPLE) ((c0total + (total>>1)) / total);
cinfo->colormap[1][icolor] = (JSAMPLE) ((c1total + (total>>1)) / total);
cinfo->colormap[2][icolor] = (JSAMPLE) ((c2total + (total>>1)) / total);
...}
LOCAL(void)
select_colors (j_decompress_ptr cinfo, int desired_colors)
{
boxptr boxlist;
int numboxes;
int i;
boxlist = (boxptr) (*cinfo->mem->alloc_small)
((j_common_ptr) cinfo, JPOOL_IMAGE, desired_colors * SIZEOF(box));
numboxes = 1;
boxlist[0].c0min = 0;
boxlist[0].c0max = MAXJSAMPLE >> C0_SHIFT;
boxlist[0].c1min = 0;
boxlist[0].c1max = MAXJSAMPLE >> C1_SHIFT;
boxlist[0].c2min = 0;
boxlist[0].c2max = MAXJSAMPLE >> C2_SHIFT;
update_box(cinfo, & boxlist[0]);
numboxes = median_cut(cinfo, boxlist, numboxes, desired_colors);
for (i = 0; i < numboxes; i++)
compute_color(cinfo, & boxlist[i], i);
cinfo->actual_number_of_colors = numboxes;
TRACEMS1(cinfo, 1, JTRC_QUANT_SELECTED, numboxes);
...}
/* ... */
#define BOX_C0_LOG (HIST_C0_BITS-3)
#define BOX_C1_LOG (HIST_C1_BITS-3)
#define BOX_C2_LOG (HIST_C2_BITS-3)
#define BOX_C0_ELEMS (1<<BOX_C0_LOG)
#define BOX_C1_ELEMS (1<<BOX_C1_LOG)
#define BOX_C2_ELEMS (1<<BOX_C2_LOG)
#define BOX_C0_SHIFT (C0_SHIFT + BOX_C0_LOG)
#define BOX_C1_SHIFT (C1_SHIFT + BOX_C1_LOG)
#define BOX_C2_SHIFT (C2_SHIFT + BOX_C2_LOG)
9 defines
/* ... */
LOCAL(int)
find_nearby_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2,
JSAMPLE colorlist[])
/* ... */
{
int numcolors = cinfo->actual_number_of_colors;
int maxc0, maxc1, maxc2;
int centerc0, centerc1, centerc2;
int i, x, ncolors;
INT32 minmaxdist, min_dist, max_dist, tdist;
INT32 mindist[MAXNUMCOLORS];
/* ... */
maxc0 = minc0 + ((1 << BOX_C0_SHIFT) - (1 << C0_SHIFT));
centerc0 = (minc0 + maxc0) >> 1;
maxc1 = minc1 + ((1 << BOX_C1_SHIFT) - (1 << C1_SHIFT));
centerc1 = (minc1 + maxc1) >> 1;
maxc2 = minc2 + ((1 << BOX_C2_SHIFT) - (1 << C2_SHIFT));
centerc2 = (minc2 + maxc2) >> 1;
/* ... */
minmaxdist = 0x7FFFFFFFL;
for (i = 0; i < numcolors; i++) {
x = GETJSAMPLE(cinfo->colormap[0][i]);
if (x < minc0) {
tdist = (x - minc0) * C0_SCALE;
min_dist = tdist*tdist;
tdist = (x - maxc0) * C0_SCALE;
max_dist = tdist*tdist;
}if (x < minc0) { ... } else if (x > maxc0) {
tdist = (x - maxc0) * C0_SCALE;
min_dist = tdist*tdist;
tdist = (x - minc0) * C0_SCALE;
max_dist = tdist*tdist;
}else if (x > maxc0) { ... } else {
min_dist = 0;
if (x <= centerc0) {
tdist = (x - maxc0) * C0_SCALE;
max_dist = tdist*tdist;
}if (x <= centerc0) { ... } else {
tdist = (x - minc0) * C0_SCALE;
max_dist = tdist*tdist;
}else { ... }
}else { ... }
x = GETJSAMPLE(cinfo->colormap[1][i]);
if (x < minc1) {
tdist = (x - minc1) * C1_SCALE;
min_dist += tdist*tdist;
tdist = (x - maxc1) * C1_SCALE;
max_dist += tdist*tdist;
}if (x < minc1) { ... } else if (x > maxc1) {
tdist = (x - maxc1) * C1_SCALE;
min_dist += tdist*tdist;
tdist = (x - minc1) * C1_SCALE;
max_dist += tdist*tdist;
}else if (x > maxc1) { ... } else {
if (x <= centerc1) {
tdist = (x - maxc1) * C1_SCALE;
max_dist += tdist*tdist;
}if (x <= centerc1) { ... } else {
tdist = (x - minc1) * C1_SCALE;
max_dist += tdist*tdist;
}else { ... }
}else { ... }
x = GETJSAMPLE(cinfo->colormap[2][i]);
if (x < minc2) {
tdist = (x - minc2) * C2_SCALE;
min_dist += tdist*tdist;
tdist = (x - maxc2) * C2_SCALE;
max_dist += tdist*tdist;
}if (x < minc2) { ... } else if (x > maxc2) {
tdist = (x - maxc2) * C2_SCALE;
min_dist += tdist*tdist;
tdist = (x - minc2) * C2_SCALE;
max_dist += tdist*tdist;
}else if (x > maxc2) { ... } else {
if (x <= centerc2) {
tdist = (x - maxc2) * C2_SCALE;
max_dist += tdist*tdist;
}if (x <= centerc2) { ... } else {
tdist = (x - minc2) * C2_SCALE;
max_dist += tdist*tdist;
}else { ... }
}else { ... }
mindist[i] = min_dist;
if (max_dist < minmaxdist)
minmaxdist = max_dist;
}for (i = 0; i < numcolors; i++) { ... }
/* ... */
ncolors = 0;
for (i = 0; i < numcolors; i++) {
if (mindist[i] <= minmaxdist)
colorlist[ncolors++] = (JSAMPLE) i;
}for (i = 0; i < numcolors; i++) { ... }
return ncolors;
...}
LOCAL(void)
find_best_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2,
int numcolors, JSAMPLE colorlist[], JSAMPLE bestcolor[])
/* ... */
{
int ic0, ic1, ic2;
int i, icolor;
register INT32 * bptr;
JSAMPLE * cptr;
INT32 dist0, dist1;
register INT32 dist2;
INT32 xx0, xx1;
register INT32 xx2;
INT32 inc0, inc1, inc2;
INT32 bestdist[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS];
bptr = bestdist;
for (i = BOX_C0_ELEMS*BOX_C1_ELEMS*BOX_C2_ELEMS-1; i >= 0; i--)
*bptr++ = 0x7FFFFFFFL;
/* ... */
#define STEP_C0 ((1 << C0_SHIFT) * C0_SCALE)
#define STEP_C1 ((1 << C1_SHIFT) * C1_SCALE)
#define STEP_C2 ((1 << C2_SHIFT) * C2_SCALE)
for (i = 0; i < numcolors; i++) {
icolor = GETJSAMPLE(colorlist[i]);
inc0 = (minc0 - GETJSAMPLE(cinfo->colormap[0][icolor])) * C0_SCALE;
dist0 = inc0*inc0;
inc1 = (minc1 - GETJSAMPLE(cinfo->colormap[1][icolor])) * C1_SCALE;
dist0 += inc1*inc1;
inc2 = (minc2 - GETJSAMPLE(cinfo->colormap[2][icolor])) * C2_SCALE;
dist0 += inc2*inc2;
inc0 = inc0 * (2 * STEP_C0) + STEP_C0 * STEP_C0;
inc1 = inc1 * (2 * STEP_C1) + STEP_C1 * STEP_C1;
inc2 = inc2 * (2 * STEP_C2) + STEP_C2 * STEP_C2;
bptr = bestdist;
cptr = bestcolor;
xx0 = inc0;
for (ic0 = BOX_C0_ELEMS-1; ic0 >= 0; ic0--) {
dist1 = dist0;
xx1 = inc1;
for (ic1 = BOX_C1_ELEMS-1; ic1 >= 0; ic1--) {
dist2 = dist1;
xx2 = inc2;
for (ic2 = BOX_C2_ELEMS-1; ic2 >= 0; ic2--) {
if (dist2 < *bptr) {
*bptr = dist2;
*cptr = (JSAMPLE) icolor;
}if (dist2 < *bptr) { ... }
dist2 += xx2;
xx2 += 2 * STEP_C2 * STEP_C2;
bptr++;
cptr++;
}for (ic2 = BOX_C2_ELEMS-1; ic2 >= 0; ic2--) { ... }
dist1 += xx1;
xx1 += 2 * STEP_C1 * STEP_C1;
}for (ic1 = BOX_C1_ELEMS-1; ic1 >= 0; ic1--) { ... }
dist0 += xx0;
xx0 += 2 * STEP_C0 * STEP_C0;
}for (ic0 = BOX_C0_ELEMS-1; ic0 >= 0; ic0--) { ... }
}for (i = 0; i < numcolors; i++) { ... }
...}
LOCAL(void)
fill_inverse_cmap (j_decompress_ptr cinfo, int c0, int c1, int c2)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
int minc0, minc1, minc2;
int ic0, ic1, ic2;
register JSAMPLE * cptr;
register histptr cachep;
JSAMPLE colorlist[MAXNUMCOLORS];
int numcolors;
JSAMPLE bestcolor[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS];
c0 >>= BOX_C0_LOG;
c1 >>= BOX_C1_LOG;
c2 >>= BOX_C2_LOG;
/* ... */
minc0 = (c0 << BOX_C0_SHIFT) + ((1 << C0_SHIFT) >> 1);
minc1 = (c1 << BOX_C1_SHIFT) + ((1 << C1_SHIFT) >> 1);
minc2 = (c2 << BOX_C2_SHIFT) + ((1 << C2_SHIFT) >> 1);
/* ... */
numcolors = find_nearby_colors(cinfo, minc0, minc1, minc2, colorlist);
find_best_colors(cinfo, minc0, minc1, minc2, numcolors, colorlist,
bestcolor);
c0 <<= BOX_C0_LOG;
c1 <<= BOX_C1_LOG;
c2 <<= BOX_C2_LOG;
cptr = bestcolor;
for (ic0 = 0; ic0 < BOX_C0_ELEMS; ic0++) {
for (ic1 = 0; ic1 < BOX_C1_ELEMS; ic1++) {
cachep = & histogram[c0+ic0][c1+ic1][c2];
for (ic2 = 0; ic2 < BOX_C2_ELEMS; ic2++) {
*cachep++ = (histcell) (GETJSAMPLE(*cptr++) + 1);
}for (ic2 = 0; ic2 < BOX_C2_ELEMS; ic2++) { ... }
}for (ic1 = 0; ic1 < BOX_C1_ELEMS; ic1++) { ... }
}for (ic0 = 0; ic0 < BOX_C0_ELEMS; ic0++) { ... }
...}
/* ... */
METHODDEF(void)
pass2_no_dither (j_decompress_ptr cinfo,
JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
register JSAMPROW inptr, outptr;
register histptr cachep;
register int c0, c1, c2;
int row;
JDIMENSION col;
JDIMENSION width = cinfo->output_width;
for (row = 0; row < num_rows; row++) {
inptr = input_buf[row];
outptr = output_buf[row];
for (col = width; col > 0; col--) {
c0 = GETJSAMPLE(*inptr++) >> C0_SHIFT;
c1 = GETJSAMPLE(*inptr++) >> C1_SHIFT;
c2 = GETJSAMPLE(*inptr++) >> C2_SHIFT;
cachep = & histogram[c0][c1][c2];
if (*cachep == 0)
fill_inverse_cmap(cinfo, c0,c1,c2);
*outptr++ = (JSAMPLE) (*cachep - 1);
}for (col = width; col > 0; col--) { ... }
}for (row = 0; row < num_rows; row++) { ... }
...}
METHODDEF(void)
pass2_fs_dither (j_decompress_ptr cinfo,
JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
register LOCFSERROR cur0, cur1, cur2;
LOCFSERROR belowerr0, belowerr1, belowerr2;
LOCFSERROR bpreverr0, bpreverr1, bpreverr2;
register FSERRPTR errorptr;
JSAMPROW inptr;
JSAMPROW outptr;
histptr cachep;
int dir;
int dir3;
int row;
JDIMENSION col;
JDIMENSION width = cinfo->output_width;
JSAMPLE *range_limit = cinfo->sample_range_limit;
int *error_limit = cquantize->error_limiter;
JSAMPROW colormap0 = cinfo->colormap[0];
JSAMPROW colormap1 = cinfo->colormap[1];
JSAMPROW colormap2 = cinfo->colormap[2];
SHIFT_TEMPS
for (row = 0; row < num_rows; row++) {
inptr = input_buf[row];
outptr = output_buf[row];
if (cquantize->on_odd_row) {
inptr += (width-1) * 3;
outptr += width-1;
dir = -1;
dir3 = -3;
errorptr = cquantize->fserrors + (width+1)*3;
cquantize->on_odd_row = FALSE;
}if (cquantize->on_odd_row) { ... } else {
dir = 1;
dir3 = 3;
errorptr = cquantize->fserrors;
cquantize->on_odd_row = TRUE;
}else { ... }
cur0 = cur1 = cur2 = 0;
belowerr0 = belowerr1 = belowerr2 = 0;
bpreverr0 = bpreverr1 = bpreverr2 = 0;
for (col = width; col > 0; col--) {
/* ... */
cur0 = RIGHT_SHIFT(cur0 + errorptr[dir3+0] + 8, 4);
cur1 = RIGHT_SHIFT(cur1 + errorptr[dir3+1] + 8, 4);
cur2 = RIGHT_SHIFT(cur2 + errorptr[dir3+2] + 8, 4);
/* ... */
cur0 = error_limit[cur0];
cur1 = error_limit[cur1];
cur2 = error_limit[cur2];
/* ... */
cur0 += GETJSAMPLE(inptr[0]);
cur1 += GETJSAMPLE(inptr[1]);
cur2 += GETJSAMPLE(inptr[2]);
cur0 = GETJSAMPLE(range_limit[cur0]);
cur1 = GETJSAMPLE(range_limit[cur1]);
cur2 = GETJSAMPLE(range_limit[cur2]);
cachep = & histogram[cur0>>C0_SHIFT][cur1>>C1_SHIFT][cur2>>C2_SHIFT];
if (*cachep == 0)
fill_inverse_cmap(cinfo, cur0>>C0_SHIFT,cur1>>C1_SHIFT,cur2>>C2_SHIFT);
{ register int pixcode = *cachep - 1;
*outptr = (JSAMPLE) pixcode;
cur0 -= GETJSAMPLE(colormap0[pixcode]);
cur1 -= GETJSAMPLE(colormap1[pixcode]);
cur2 -= GETJSAMPLE(colormap2[pixcode]);
...}
/* ... */
{ register LOCFSERROR bnexterr, delta;
bnexterr = cur0;
delta = cur0 * 2;
cur0 += delta;
errorptr[0] = (FSERROR) (bpreverr0 + cur0);
cur0 += delta;
bpreverr0 = belowerr0 + cur0;
belowerr0 = bnexterr;
cur0 += delta;
bnexterr = cur1;
delta = cur1 * 2;
cur1 += delta;
errorptr[1] = (FSERROR) (bpreverr1 + cur1);
cur1 += delta;
bpreverr1 = belowerr1 + cur1;
belowerr1 = bnexterr;
cur1 += delta;
bnexterr = cur2;
delta = cur2 * 2;
cur2 += delta;
errorptr[2] = (FSERROR) (bpreverr2 + cur2);
cur2 += delta;
bpreverr2 = belowerr2 + cur2;
belowerr2 = bnexterr;
cur2 += delta;
...}
/* ... */
inptr += dir3;
outptr += dir;
errorptr += dir3;
}for (col = width; col > 0; col--) { ... }
/* ... */
errorptr[0] = (FSERROR) bpreverr0;
errorptr[1] = (FSERROR) bpreverr1;
errorptr[2] = (FSERROR) bpreverr2;
}for (row = 0; row < num_rows; row++) { ... }
...}
/* ... */
LOCAL(void)
init_error_limit (j_decompress_ptr cinfo)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
int * table;
int in, out;
table = (int *) (*cinfo->mem->alloc_small)
((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE*2+1) * SIZEOF(int));
table += MAXJSAMPLE;
cquantize->error_limiter = table;
#define STEPSIZE ((MAXJSAMPLE+1)/16)
out = 0;
for (in = 0; in < STEPSIZE; in++, out++) {
table[in] = out; table[-in] = -out;
}for (in = 0; in < STEPSIZE; in++, out++) { ... }
for (; in < STEPSIZE*3; in++, out += (in&1) ? 0 : 1) {
table[in] = out; table[-in] = -out;
}for (; in < STEPSIZE*3; in++, out += (in&1) ? 0 : 1) { ... }
for (; in <= MAXJSAMPLE; in++) {
table[in] = out; table[-in] = -out;
}for (; in <= MAXJSAMPLE; in++) { ... }
#undef STEPSIZE
...}
/* ... */
METHODDEF(void)
finish_pass1 (j_decompress_ptr cinfo)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
cinfo->colormap = cquantize->sv_colormap;
select_colors(cinfo, cquantize->desired);
cquantize->needs_zeroed = TRUE;
}{ ... }
METHODDEF(void)
finish_pass2 (j_decompress_ptr cinfo)
{
}{ ... }
/* ... */
METHODDEF(void)
start_pass_2_quant (j_decompress_ptr cinfo, boolean is_pre_scan)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
int i;
if (cinfo->dither_mode != JDITHER_NONE)
cinfo->dither_mode = JDITHER_FS;
if (is_pre_scan) {
cquantize->pub.color_quantize = prescan_quantize;
cquantize->pub.finish_pass = finish_pass1;
cquantize->needs_zeroed = TRUE;
}if (is_pre_scan) { ... } else {
if (cinfo->dither_mode == JDITHER_FS)
cquantize->pub.color_quantize = pass2_fs_dither;
else
cquantize->pub.color_quantize = pass2_no_dither;
cquantize->pub.finish_pass = finish_pass2;
i = cinfo->actual_number_of_colors;
if (i < 1)
ERREXIT1(cinfo, JERR_QUANT_FEW_COLORS, 1);
if (i > MAXNUMCOLORS)
ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS);
if (cinfo->dither_mode == JDITHER_FS) {
size_t arraysize = (size_t) ((cinfo->output_width + 2) *
(3 * SIZEOF(FSERROR)));
if (cquantize->fserrors == NULL)
cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large)
((j_common_ptr) cinfo, JPOOL_IMAGE, arraysize);
FMEMZERO((void FAR *) cquantize->fserrors, arraysize);
if (cquantize->error_limiter == NULL)
init_error_limit(cinfo);
cquantize->on_odd_row = FALSE;
}if (cinfo->dither_mode == JDITHER_FS) { ... }
}else { ... }
if (cquantize->needs_zeroed) {
for (i = 0; i < HIST_C0_ELEMS; i++) {
FMEMZERO((void FAR *) histogram[i],
HIST_C1_ELEMS*HIST_C2_ELEMS * SIZEOF(histcell));
}for (i = 0; i < HIST_C0_ELEMS; i++) { ... }
cquantize->needs_zeroed = FALSE;
}if (cquantize->needs_zeroed) { ... }
}{ ... }
/* ... */
METHODDEF(void)
new_color_map_2_quant (j_decompress_ptr cinfo)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
cquantize->needs_zeroed = TRUE;
}{ ... }
/* ... */
GLOBAL(void)
jinit_2pass_quantizer (j_decompress_ptr cinfo)
{
my_cquantize_ptr cquantize;
int i;
cquantize = (my_cquantize_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
SIZEOF(my_cquantizer));
cinfo->cquantize = (struct jpeg_color_quantizer *) cquantize;
cquantize->pub.start_pass = start_pass_2_quant;
cquantize->pub.new_color_map = new_color_map_2_quant;
cquantize->fserrors = NULL;
cquantize->error_limiter = NULL;
if (cinfo->out_color_components != 3)
ERREXIT(cinfo, JERR_NOTIMPL);
cquantize->histogram = (hist3d) (*cinfo->mem->alloc_small)
((j_common_ptr) cinfo, JPOOL_IMAGE, HIST_C0_ELEMS * SIZEOF(hist2d));
for (i = 0; i < HIST_C0_ELEMS; i++) {
cquantize->histogram[i] = (hist2d) (*cinfo->mem->alloc_large)
((j_common_ptr) cinfo, JPOOL_IMAGE,
HIST_C1_ELEMS*HIST_C2_ELEMS * SIZEOF(histcell));
}for (i = 0; i < HIST_C0_ELEMS; i++) { ... }
cquantize->needs_zeroed = TRUE;
/* ... */
if (cinfo->enable_2pass_quant) {
int desired = cinfo->desired_number_of_colors;
if (desired < 8)
ERREXIT1(cinfo, JERR_QUANT_FEW_COLORS, 8);
if (desired > MAXNUMCOLORS)
ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS);
cquantize->sv_colormap = (*cinfo->mem->alloc_sarray)
((j_common_ptr) cinfo,JPOOL_IMAGE, (JDIMENSION) desired, (JDIMENSION) 3);
cquantize->desired = desired;
}if (cinfo->enable_2pass_quant) { ... } else
cquantize->sv_colormap = NULL;
if (cinfo->dither_mode != JDITHER_NONE)
cinfo->dither_mode = JDITHER_FS;
/* ... */
if (cinfo->dither_mode == JDITHER_FS) {
cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large)
((j_common_ptr) cinfo, JPOOL_IMAGE,
(size_t) ((cinfo->output_width + 2) * (3 * SIZEOF(FSERROR))));
init_error_limit(cinfo);
}if (cinfo->dither_mode == JDITHER_FS) { ... }
}{ ... }
/* ... */#endif