// Created: 22/6/2000
// RCS-ID: $Id$
// Copyright: (c) Thomas G. Lane, Vaclav Slavik, Julian Smart
-// Licence: wxWindows licence + JPEG library licence
+// Licence: wxWindows licence + JPEG library licence
/////////////////////////////////////////////////////////////////////////////
/*
#include <stdlib.h>
#include <string.h>
-#if defined(__VISAGECPP__)
+#if defined(__OS2__)
#define RGB_RED_OS2 0
#define RGB_GREEN_OS2 1
#define RGB_BLUE_OS2 2
JSAMPLE *sample_range_limit, *srl_orig;
} j_decompress;
+#if defined(__WINDOWS__) && !defined(__WXMICROWIN__)
+ #define JMETHOD(type,methodname,arglist) type (__cdecl methodname) arglist
+#else
+ #define JMETHOD(type,methodname,arglist) type (methodname) arglist
+#endif
+
typedef j_decompress *j_decompress_ptr;
+struct jpeg_color_quantizer {
+ JMETHOD(void, start_pass, (j_decompress_ptr cinfo, bool is_pre_scan));
+ JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
+ JSAMPARRAY input_buf, JSAMPARRAY output_buf,
+ int num_rows));
+ JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
+ JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
+};
+
+
/*
* probably need to change these scale factors.
*/
-#define R_SCALE 2 /* scale R distances by this much */
-#define G_SCALE 3 /* scale G distances by this much */
-#define B_SCALE 1 /* and B by this much */
+#define R_SCALE 2 /* scale R distances by this much */
+#define G_SCALE 3 /* scale G distances by this much */
+#define B_SCALE 1 /* and B by this much */
/* Relabel R/G/B as components 0/1/2, respecting the RGB ordering defined
* in jmorecfg.h. As the code stands, it will do the right thing for R,G,B
* you'll probably want to tweak the histogram sizes too.
*/
-#if defined(__VISAGECPP__)
+#if defined(__OS2__)
#if RGB_RED_OS2 == 0
#define C0_SCALE R_SCALE
/* These will do the right thing for either R,G,B or B,G,R color order,
* but you may not like the results for other color orders.
*/
-#define HIST_C0_BITS 5 /* bits of precision in R/B histogram */
-#define HIST_C1_BITS 6 /* bits of precision in G histogram */
-#define HIST_C2_BITS 5 /* bits of precision in B/R histogram */
+#define HIST_C0_BITS 5 /* bits of precision in R/B histogram */
+#define HIST_C1_BITS 6 /* bits of precision in G histogram */
+#define HIST_C2_BITS 5 /* bits of precision in B/R histogram */
/* Number of elements along histogram axes. */
#define HIST_C0_ELEMS (1<<HIST_C0_BITS)
#define C2_SHIFT (BITS_IN_JSAMPLE-HIST_C2_BITS)
-typedef UINT16 histcell; /* histogram cell; prefer an unsigned type */
+typedef UINT16 histcell; /* histogram cell; prefer an unsigned type */
-typedef histcell * histptr; /* for pointers to histogram cells */
+typedef histcell * histptr; /* for pointers to histogram cells */
typedef histcell hist1d[HIST_C2_ELEMS]; /* typedefs for the array */
-typedef hist1d * hist2d; /* type for the 2nd-level pointers */
-typedef hist2d * hist3d; /* type for top-level pointer */
+typedef hist1d * hist2d; /* type for the 2nd-level pointers */
+typedef hist2d * hist3d; /* type for top-level pointer */
/* Declarations for Floyd-Steinberg dithering.
* Errors are accumulated into the array fserrors[], at a resolution of
* 1/16th of a pixel count. The error at a given pixel is propagated
* to its not-yet-processed neighbors using the standard F-S fractions,
- * ... (here) 7/16
- * 3/16 5/16 1/16
+ * ... (here) 7/16
+ * 3/16 5/16 1/16
* We work left-to-right on even rows, right-to-left on odd rows.
*
* We can get away with a single array (holding one row's worth of errors)
*/
#if BITS_IN_JSAMPLE == 8
-typedef INT16 FSERROR; /* 16 bits should be enough */
-typedef int LOCFSERROR; /* use 'int' for calculation temps */
+typedef INT16 FSERROR; /* 16 bits should be enough */
+typedef int LOCFSERROR; /* use 'int' for calculation temps */
#else
-typedef INT32 FSERROR; /* may need more than 16 bits */
-typedef INT32 LOCFSERROR; /* be sure calculation temps are big enough */
+typedef INT32 FSERROR; /* may need more than 16 bits */
+typedef INT32 LOCFSERROR; /* be sure calculation temps are big enough */
#endif
-typedef FSERROR *FSERRPTR; /* pointer to error array (in storage!) */
+typedef FSERROR *FSERRPTR; /* pointer to error array (in storage!) */
/* Private subobject */
} pub;
/* Space for the eventually created colormap is stashed here */
- JSAMPARRAY sv_colormap; /* colormap allocated at init time */
- int desired; /* desired # of colors = size of colormap */
+ JSAMPARRAY sv_colormap; /* colormap allocated at init time */
+ int desired; /* desired # of colors = size of colormap */
/* Variables for accumulating image statistics */
- hist3d histogram; /* pointer to the histogram */
+ hist3d histogram; /* pointer to the histogram */
- bool needs_zeroed; /* true if next pass must zero histogram */
+ bool needs_zeroed; /* true if next pass must zero histogram */
/* Variables for Floyd-Steinberg dithering */
- FSERRPTR fserrors; /* accumulated errors */
- bool on_odd_row; /* flag to remember which row we are on */
- int * error_limiter; /* table for clamping the applied error */
+ FSERRPTR fserrors; /* accumulated errors */
+ bool on_odd_row; /* flag to remember which row we are on */
+ int * error_limiter; /* table for clamping the applied error */
} my_cquantizer;
typedef my_cquantizer * my_cquantize_ptr;
void
prescan_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
- JSAMPARRAY output_buf, int num_rows)
+ JSAMPARRAY output_buf, int num_rows)
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
register JSAMPROW ptr;
/* get pixel value and index into the histogram */
histp = & histogram[GETJSAMPLE(ptr[0]) >> C0_SHIFT]
- [GETJSAMPLE(ptr[1]) >> C1_SHIFT]
- [GETJSAMPLE(ptr[2]) >> C2_SHIFT];
+ [GETJSAMPLE(ptr[1]) >> C1_SHIFT]
+ [GETJSAMPLE(ptr[2]) >> C2_SHIFT];
/* increment, check for overflow and undo increment if so. */
if (++(*histp) <= 0)
(*histp)--;
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;
- }
+ histp = & histogram[c0][c1][c2min];
+ for (c2 = c2min; c2 <= c2max; c2++)
+ if (*histp++ != 0) {
+ boxp->c0min = c0min = c0;
+ goto have_c0min;
+ }
}
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;
- }
+ histp = & histogram[c0][c1][c2min];
+ for (c2 = c2min; c2 <= c2max; c2++)
+ if (*histp++ != 0) {
+ boxp->c0max = c0max = c0;
+ goto have_c0max;
+ }
}
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;
- }
+ histp = & histogram[c0][c1][c2min];
+ for (c2 = c2min; c2 <= c2max; c2++)
+ if (*histp++ != 0) {
+ boxp->c1min = c1min = c1;
+ goto have_c1min;
+ }
}
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;
- }
+ histp = & histogram[c0][c1][c2min];
+ for (c2 = c2min; c2 <= c2max; c2++)
+ if (*histp++ != 0) {
+ boxp->c1max = c1max = c1;
+ goto have_c1max;
+ }
}
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;
- }
+ 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;
+ }
}
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;
- }
+ 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;
+ }
}
have_c2max:
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) {
+ ccount++;
+ }
}
boxp->colorcount = ccount;
}
int
median_cut (j_decompress_ptr cinfo, boxptr boxlist, int numboxes,
- int desired_colors)
+ int desired_colors)
/* Repeatedly select and split the largest box until we have enough boxes */
{
int n,lb;
/* Select box to split.
* Current algorithm: by population for first half, then by volume.
*/
- if (numboxes*2 <= desired_colors) {
+ if ((numboxes*2) <= desired_colors) {
b1 = find_biggest_color_pop(boxlist, numboxes);
} else {
b1 = find_biggest_volume(boxlist, numboxes);
}
- if (b1 == NULL) /* no splittable boxes left! */
+ if (b1 == NULL) /* no splittable boxes left! */
break;
- b2 = &boxlist[numboxes]; /* where new box will go */
+ b2 = &boxlist[numboxes]; /* where new box will go */
/* Copy the color bounds to the new box. */
b2->c0max = b1->c0max; b2->c1max = b1->c1max; b2->c2max = b1->c2max;
b2->c0min = b1->c0min; b2->c1min = b1->c1min; b2->c2min = b1->c2min;
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) {
+ 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;
+ }
}
}
static int
find_nearby_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2,
- JSAMPLE colorlist[])
+ JSAMPLE colorlist[])
/* Locate the colormap entries close enough to an update box to be candidates
* for the nearest entry to some cell(s) in the update box. The update box
* is specified by the center coordinates of its first cell. The number of
int centerc0, centerc1, centerc2;
int i, x, ncolors;
INT32 minmaxdist, min_dist, max_dist, tdist;
- INT32 mindist[MAXNUMCOLORS]; /* min distance to colormap entry i */
+ INT32 mindist[MAXNUMCOLORS]; /* min distance to colormap entry i */
/* Compute true coordinates of update box's upper corner and center.
* Actually we compute the coordinates of the center of the upper-corner
/* within cell range so no contribution to min_dist */
min_dist = 0;
if (x <= centerc0) {
- tdist = (x - maxc0) * C0_SCALE;
- max_dist = tdist*tdist;
+ tdist = (x - maxc0) * C0_SCALE;
+ max_dist = tdist*tdist;
} else {
- tdist = (x - minc0) * C0_SCALE;
- max_dist = tdist*tdist;
+ tdist = (x - minc0) * C0_SCALE;
+ max_dist = tdist*tdist;
}
}
} else {
/* within cell range so no contribution to min_dist */
if (x <= centerc1) {
- tdist = (x - maxc1) * C1_SCALE;
- max_dist += tdist*tdist;
+ tdist = (x - maxc1) * C1_SCALE;
+ max_dist += tdist*tdist;
} else {
- tdist = (x - minc1) * C1_SCALE;
- max_dist += tdist*tdist;
+ tdist = (x - minc1) * C1_SCALE;
+ max_dist += tdist*tdist;
}
}
} else {
/* within cell range so no contribution to min_dist */
if (x <= centerc2) {
- tdist = (x - maxc2) * C2_SCALE;
- max_dist += tdist*tdist;
+ tdist = (x - maxc2) * C2_SCALE;
+ max_dist += tdist*tdist;
} else {
- tdist = (x - minc2) * C2_SCALE;
- max_dist += tdist*tdist;
+ tdist = (x - minc2) * C2_SCALE;
+ max_dist += tdist*tdist;
}
}
- mindist[i] = min_dist; /* save away the results */
+ mindist[i] = min_dist; /* save away the results */
if (max_dist < minmaxdist)
minmaxdist = max_dist;
}
static void
find_best_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2,
- int numcolors, JSAMPLE colorlist[], JSAMPLE bestcolor[])
+ int numcolors, JSAMPLE colorlist[], JSAMPLE bestcolor[])
/* Find the closest colormap entry for each cell in the update box,
* given the list of candidate colors prepared by find_nearby_colors.
* Return the indexes of the closest entries in the bestcolor[] array.
{
int ic0, ic1, ic2;
int i, icolor;
- register INT32 * bptr; /* pointer into bestdist[] array */
- JSAMPLE * cptr; /* pointer into bestcolor[] array */
- INT32 dist0, dist1; /* initial distance values */
- register INT32 dist2; /* current distance in inner loop */
- INT32 xx0, xx1; /* distance increments */
+ register INT32 * bptr; /* pointer into bestdist[] array */
+ JSAMPLE * cptr; /* pointer into bestcolor[] array */
+ INT32 dist0, dist1; /* initial distance values */
+ register INT32 dist2; /* current distance in inner loop */
+ INT32 xx0, xx1; /* distance increments */
register INT32 xx2;
- INT32 inc0, inc1, inc2; /* initial values for increments */
+ INT32 inc0, inc1, inc2; /* initial values for increments */
/* This array holds the distance to the nearest-so-far color for each cell */
INT32 bestdist[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS];
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;
- }
- dist2 += xx2;
- xx2 += 2 * STEP_C2 * STEP_C2;
- bptr++;
- cptr++;
- }
- dist1 += xx1;
- xx1 += 2 * STEP_C1 * STEP_C1;
+ dist2 = dist1;
+ xx2 = inc2;
+ for (ic2 = BOX_C2_ELEMS-1; ic2 >= 0; ic2--) {
+ if (dist2 < *bptr) {
+ *bptr = dist2;
+ *cptr = (JSAMPLE) icolor;
+ }
+ dist2 += xx2;
+ xx2 += 2 * STEP_C2 * STEP_C2;
+ bptr++;
+ cptr++;
+ }
+ dist1 += xx1;
+ xx1 += 2 * STEP_C1 * STEP_C1;
}
dist0 += xx0;
xx0 += 2 * STEP_C0 * STEP_C0;
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
- int minc0, minc1, minc2; /* lower left corner of update box */
+ int minc0, minc1, minc2; /* lower left corner of update box */
int ic0, ic1, ic2;
- register JSAMPLE * cptr; /* pointer into bestcolor[] array */
- register histptr cachep; /* pointer into main cache array */
+ register JSAMPLE * cptr; /* pointer into bestcolor[] array */
+ register histptr cachep; /* pointer into main cache array */
/* This array lists the candidate colormap indexes. */
JSAMPLE colorlist[MAXNUMCOLORS];
- int numcolors; /* number of candidate colors */
+ int numcolors; /* number of candidate colors */
/* This array holds the actually closest colormap index for each cell. */
JSAMPLE bestcolor[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS];
/* Determine the actually nearest colors. */
find_best_colors(cinfo, minc0, minc1, minc2, numcolors, colorlist,
- bestcolor);
+ bestcolor);
/* Save the best color numbers (plus 1) in the main cache array */
- c0 <<= BOX_C0_LOG; /* convert ID back to base cell indexes */
+ c0 <<= BOX_C0_LOG; /* convert ID back to base cell indexes */
c1 <<= BOX_C1_LOG;
c2 <<= BOX_C2_LOG;
cptr = bestcolor;
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);
+ *cachep++ = (histcell) (GETJSAMPLE(*cptr++) + 1);
}
}
}
void
pass2_no_dither (j_decompress_ptr cinfo,
- JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
+ JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
/* This version performs no dithering */
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
/* If we have not seen this color before, find nearest colormap entry */
/* and update the cache */
if (*cachep == 0)
- fill_inverse_cmap(cinfo, c0,c1,c2);
+ fill_inverse_cmap(cinfo, c0,c1,c2);
/* Now emit the colormap index for this cell */
*outptr++ = (JSAMPLE) (*cachep - 1);
}
void
pass2_fs_dither (j_decompress_ptr cinfo,
- JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
+ JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
/* This version performs Floyd-Steinberg dithering */
{
my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
hist3d histogram = cquantize->histogram;
- register LOCFSERROR cur0, cur1, cur2; /* current error or pixel value */
+ register LOCFSERROR cur0, cur1, cur2; /* current error or pixel value */
LOCFSERROR belowerr0, belowerr1, belowerr2; /* error for pixel below cur */
LOCFSERROR bpreverr0, bpreverr1, bpreverr2; /* error for below/prev col */
- register FSERRPTR errorptr; /* => fserrors[] at column before current */
- JSAMPROW inptr; /* => current input pixel */
- JSAMPROW outptr; /* => current output pixel */
+ register FSERRPTR errorptr; /* => fserrors[] at column before current */
+ JSAMPROW inptr; /* => current input pixel */
+ JSAMPROW outptr; /* => current output pixel */
histptr cachep;
- int dir; /* +1 or -1 depending on direction */
- int dir3; /* 3*dir, for advancing inptr & errorptr */
+ int dir; /* +1 or -1 depending on direction */
+ int dir3; /* 3*dir, for advancing inptr & errorptr */
int row;
JDIMENSION col;
JDIMENSION width = cinfo->output_width;
outptr = output_buf[row];
if (cquantize->on_odd_row) {
/* work right to left in this row */
- inptr += (width-1) * 3; /* so point to rightmost pixel */
+ inptr += (width-1) * 3; /* so point to rightmost pixel */
outptr += width-1;
dir = -1;
dir3 = -3;
/* If we have not seen this color before, find nearest colormap */
/* entry and update the cache */
if (*cachep == 0)
- fill_inverse_cmap(cinfo, cur0>>C0_SHIFT,cur1>>C1_SHIFT,cur2>>C2_SHIFT);
+ fill_inverse_cmap(cinfo, cur0>>C0_SHIFT,cur1>>C1_SHIFT,cur2>>C2_SHIFT);
/* Now emit the colormap index for this cell */
{ register int pixcode = *cachep - 1;
- *outptr = (JSAMPLE) pixcode;
- /* Compute representation error for this pixel */
- cur0 -= GETJSAMPLE(colormap0[pixcode]);
- cur1 -= GETJSAMPLE(colormap1[pixcode]);
- cur2 -= GETJSAMPLE(colormap2[pixcode]);
+ *outptr = (JSAMPLE) pixcode;
+ /* Compute representation error for this pixel */
+ cur0 -= GETJSAMPLE(colormap0[pixcode]);
+ cur1 -= GETJSAMPLE(colormap1[pixcode]);
+ cur2 -= GETJSAMPLE(colormap2[pixcode]);
}
/* Compute error fractions to be propagated to adjacent pixels.
* Add these into the running sums, and simultaneously shift the
*/
{ register LOCFSERROR bnexterr, delta;
- bnexterr = cur0; /* Process component 0 */
- delta = cur0 * 2;
- cur0 += delta; /* form error * 3 */
- errorptr[0] = (FSERROR) (bpreverr0 + cur0);
- cur0 += delta; /* form error * 5 */
- bpreverr0 = belowerr0 + cur0;
- belowerr0 = bnexterr;
- cur0 += delta; /* form error * 7 */
- bnexterr = cur1; /* Process component 1 */
- delta = cur1 * 2;
- cur1 += delta; /* form error * 3 */
- errorptr[1] = (FSERROR) (bpreverr1 + cur1);
- cur1 += delta; /* form error * 5 */
- bpreverr1 = belowerr1 + cur1;
- belowerr1 = bnexterr;
- cur1 += delta; /* form error * 7 */
- bnexterr = cur2; /* Process component 2 */
- delta = cur2 * 2;
- cur2 += delta; /* form error * 3 */
- errorptr[2] = (FSERROR) (bpreverr2 + cur2);
- cur2 += delta; /* form error * 5 */
- bpreverr2 = belowerr2 + cur2;
- belowerr2 = bnexterr;
- cur2 += delta; /* form error * 7 */
+ bnexterr = cur0; /* Process component 0 */
+ delta = cur0 * 2;
+ cur0 += delta; /* form error * 3 */
+ errorptr[0] = (FSERROR) (bpreverr0 + cur0);
+ cur0 += delta; /* form error * 5 */
+ bpreverr0 = belowerr0 + cur0;
+ belowerr0 = bnexterr;
+ cur0 += delta; /* form error * 7 */
+ bnexterr = cur1; /* Process component 1 */
+ delta = cur1 * 2;
+ cur1 += delta; /* form error * 3 */
+ errorptr[1] = (FSERROR) (bpreverr1 + cur1);
+ cur1 += delta; /* form error * 5 */
+ bpreverr1 = belowerr1 + cur1;
+ belowerr1 = bnexterr;
+ cur1 += delta; /* form error * 7 */
+ bnexterr = cur2; /* Process component 2 */
+ delta = cur2 * 2;
+ cur2 += delta; /* form error * 3 */
+ errorptr[2] = (FSERROR) (bpreverr2 + cur2);
+ cur2 += delta; /* form error * 5 */
+ bpreverr2 = belowerr2 + cur2;
+ belowerr2 = bnexterr;
+ cur2 += delta; /* form error * 7 */
}
/* At this point curN contains the 7/16 error value to be propagated
* to the next pixel on the current line, and all the errors for the
* next line have been shifted over. We are therefore ready to move on.
*/
- inptr += dir3; /* Advance pixel pointers to next column */
+ inptr += dir3; /* Advance pixel pointers to next column */
outptr += dir;
- errorptr += dir3; /* advance errorptr to current column */
+ errorptr += dir3; /* advance errorptr to current column */
}
/* Post-loop cleanup: we must unload the final error values into the
* final fserrors[] entry. Note we need not unload belowerrN because
int in, out;
table = (int *) malloc((MAXJSAMPLE*2+1) * sizeof(int));
- table += MAXJSAMPLE; /* so can index -MAXJSAMPLE .. +MAXJSAMPLE */
+ table += MAXJSAMPLE; /* so can index -MAXJSAMPLE .. +MAXJSAMPLE */
cquantize->error_limiter = table;
#define STEPSIZE ((MAXJSAMPLE+1)/16)
{
size_t arraysize = (size_t) ((cinfo->output_width + 2) *
- (3 * sizeof(FSERROR)));
+ (3 * sizeof(FSERROR)));
/* Allocate Floyd-Steinberg workspace if we didn't already. */
if (cquantize->fserrors == NULL)
- cquantize->fserrors = (INT16*) malloc(arraysize);
+ cquantize->fserrors = (INT16*) malloc(arraysize);
/* Initialize the propagated errors to zero. */
memset((void *) cquantize->fserrors, 0, arraysize);
/* Make the error-limit table if we didn't already. */
if (cquantize->error_limiter == NULL)
- init_error_limit(cinfo);
+ init_error_limit(cinfo);
cquantize->on_odd_row = FALSE;
}
if (cquantize->needs_zeroed) {
for (i = 0; i < HIST_C0_ELEMS; i++) {
memset((void *) histogram[i], 0,
- HIST_C1_ELEMS*HIST_C2_ELEMS * sizeof(histcell));
+ HIST_C1_ELEMS*HIST_C2_ELEMS * sizeof(histcell));
}
cquantize->needs_zeroed = FALSE;
}
int i;
cquantize = (my_cquantize_ptr) malloc(sizeof(my_cquantizer));
- cinfo->cquantize = (struct jpeg_color_quantizer *) cquantize;
+ cinfo->cquantize = (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; /* flag optional arrays not allocated */
+ cquantize->fserrors = NULL; /* flag optional arrays not allocated */
cquantize->error_limiter = NULL;
table = (JSAMPLE *) malloc((5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * sizeof(JSAMPLE));
cinfo->srl_orig = table;
- table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */
+ table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */
cinfo->sample_range_limit = table;
/* First segment of "simple" table: limit[x] = 0 for x < 0 */
memset(table - (MAXJSAMPLE+1), 0, (MAXJSAMPLE+1) * sizeof(JSAMPLE));
/* Main part of "simple" table: limit[x] = x */
for (i = 0; i <= MAXJSAMPLE; i++)
table[i] = (JSAMPLE) i;
- table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */
+ table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */
/* End of simple table, rest of first half of post-IDCT table */
for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++)
table[i] = MAXJSAMPLE;
/* Second half of post-IDCT table */
memset(table + (2 * (MAXJSAMPLE+1)), 0,
- (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * sizeof(JSAMPLE));
+ (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * sizeof(JSAMPLE));
memcpy(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE),
- cinfo->sample_range_limit, CENTERJSAMPLE * sizeof(JSAMPLE));
+ cinfo->sample_range_limit, CENTERJSAMPLE * sizeof(JSAMPLE));
}
// TODO: somehow make use of the Windows system colours, rather than ignoring them for the
// purposes of quantization.
-bool wxQuantize::Quantize(const wxImage& src, wxImage& dest, wxPalette** pPalette, int desiredNoColours,
- unsigned char** eightBitData, int flags)
+bool wxQuantize::Quantize(const wxImage& src, wxImage& dest,
+ wxPalette** pPalette,
+ int desiredNoColours,
+ unsigned char** eightBitData,
+ int flags)
{
int i;
int h = src.GetHeight();
int windowsSystemColourCount = 20;
+
int paletteShift = 0;
// Shift the palette up by the number of Windows system colours,
else
delete[] data8bit;
+#if wxUSE_PALETTE
// Make a wxWindows palette
if (pPalette)
{
delete[] g;
delete[] b;
}
+#endif // wxUSE_PALETTE
return TRUE;
}
// This version sets a palette in the destination image so you don't
// have to manage it yourself.
-bool wxQuantize::Quantize(const wxImage& src, wxImage& dest, int desiredNoColours,
- unsigned char** eightBitData, int flags)
+bool wxQuantize::Quantize(const wxImage& src,
+ wxImage& dest,
+ int desiredNoColours,
+ unsigned char** eightBitData,
+ int flags)
{
wxPalette* palette = NULL;
- if (Quantize(src, dest, & palette, desiredNoColours, eightBitData, flags))
+ if ( !Quantize(src, dest, & palette, desiredNoColours, eightBitData, flags) )
+ return FALSE;
+
+#if wxUSE_PALETTE
+ if (palette)
{
- if (palette)
- {
- dest.SetPalette(* palette);
- delete palette;
- }
- return TRUE;
+ dest.SetPalette(* palette);
+ delete palette;
}
- else
- return FALSE;
+#endif // wxUSE_PALETTE
+
+ return TRUE;
}
projects / wxWidgets.git / blobdiff