currently only used by gif.c, but maybe we'll support producing
8-bit (or bigger indexed) png files at some point
*/
-#include "image.h"
+#include "imager.h"
static void makemap_addi(i_quantize *, i_img **imgs, int count);
+static void makemap_mediancut(i_quantize *, i_img **imgs, int count);
+static void makemap_mono(i_quantize *);
static
void
handle multiple colour maps.
*/
+/*
+=item i_quant_makemap(C<quant>, C<imgs>, C<count>)
+
+=category Image quantization
+
+Analyzes the C<count> images in C<imgs> according to the rules in
+C<quant> to build a color map (optimal or not depending on
+C<< quant->make_colors >>).
+
+=cut
+*/
+
void
-quant_makemap(i_quantize *quant, i_img **imgs, int count) {
- i_color temp;
-#ifdef HAVE_LIBGIF
- /* giflib does it's own color table generation */
- if (quant->translate == pt_giflib)
+i_quant_makemap(i_quantize *quant, i_img **imgs, int count) {
+
+ if (quant->translate == pt_giflib) {
+ /* giflib does it's own color table generation */
+ /* previously we used giflib's quantizer, but it didn't handle multiple
+ images, which made it hard to build a global color map
+ We've implemented our own median cut code so we can ignore
+ the giflib version */
+ makemap_mediancut(quant, imgs, count);
return;
-#endif
+ }
+
switch (quant->make_colors & mc_mask) {
case mc_none:
/* use user's specified map */
for (r = 0; r < 256; r+=0x33)
for (g = 0; g < 256; g+=0x33)
for (b = 0; b < 256; b += 0x33)
- setcol(quant->mc_colors+i++, r, g, b, 0);
+ setcol(quant->mc_colors+i++, r, g, b, 255);
quant->mc_count = i;
}
break;
+ case mc_median_cut:
+ makemap_mediancut(quant, imgs, count);
+ break;
+
+ case mc_mono:
+ makemap_mono(quant);
+ break;
+
case mc_addi:
default:
makemap_addi(quant, imgs, count);
}
}
-#ifdef HAVE_LIBGIF
-static void translate_giflib(i_quantize *, i_img *, i_palidx *);
-#endif
static void translate_closest(i_quantize *, i_img *, i_palidx *);
static void translate_errdiff(i_quantize *, i_img *, i_palidx *);
static void translate_addi(i_quantize *, i_img *, i_palidx *);
-/* Quantize the image given the palette in quant.
+/*
+=item i_quant_translate(C<quant>, C<img>)
- The giflib quantizer ignores the palette.
+=category Image quantization
+
+Quantize the image given the palette in C<quant>.
+
+On success returns a pointer to a memory block of C<< img->xsize *
+img->ysize >> C<i_palidx> entries.
+
+On failure returns NULL.
+
+You should call myfree() on the returned block when you're done with
+it.
+
+This function will fail if the supplied palette contains no colors.
+
+=cut
*/
-i_palidx *quant_translate(i_quantize *quant, i_img *img) {
+i_palidx *
+i_quant_translate(i_quantize *quant, i_img *img) {
i_palidx *result;
- mm_log((1, "quant_translate(quant %p, img %p)\n", quant, img));
+ int bytes;
- result = mymalloc(img->xsize * img->ysize);
+ mm_log((1, "quant_translate(quant %p, img %p)\n", quant, img));
- switch (quant->translate) {
-#ifdef HAVE_LIBGIF
- case pt_giflib:
- translate_giflib(quant, img, result);
- break;
-#endif
+ /* there must be at least one color in the paletted (though even that
+ isn't very useful */
+ if (quant->mc_count == 0) {
+ i_push_error(0, "no colors available for translation");
+ return NULL;
+ }
+ bytes = img->xsize * img->ysize;
+ if (bytes / img->ysize != img->xsize) {
+ i_push_error(0, "integer overflow calculating memory allocation");
+ return NULL;
+ }
+ result = mymalloc(bytes);
+
+ switch (quant->translate) {
case pt_closest:
+ case pt_giflib:
translate_closest(quant, img, result);
break;
-
+
case pt_errdiff:
translate_errdiff(quant, img, result);
break;
-
+
case pt_perturb:
default:
translate_addi(quant, img, result);
break;
}
-
- return result;
-}
-
-#ifdef HAVE_LIBGIF
-#include "gif_lib.h"
-
-#define GET_RGB(im, x, y, ri, gi, bi, col) \
- i_gpix((im),(x),(y),&(col)); (ri)=(col).rgb.r; \
- if((im)->channels==3) { (bi)=(col).rgb.b; (gi)=(col).rgb.g; }
-
-static int
-quant_replicate(i_img *im, i_palidx *output, i_quantize *quant);
-
-/* Use the gif_lib quantization functions to quantize the image */
-static void translate_giflib(i_quantize *quant, i_img *img, i_palidx *out) {
- int x,y,ColorMapSize,colours_in;
- unsigned long Size;
- int i;
-
- GifByteType *RedBuffer = NULL, *GreenBuffer = NULL, *BlueBuffer = NULL;
- GifByteType *RedP, *GreenP, *BlueP;
- ColorMapObject *OutputColorMap = NULL;
- i_color col;
-
- mm_log((1,"i_writegif(quant %p, img %p, out %p)\n", quant, img, out));
-
- /*if (!(im->channels==1 || im->channels==3)) { fprintf(stderr,"Unable to write gif, improper colorspace.\n"); exit(3); }*/
-
- ColorMapSize = quant->mc_size;
-
- Size = ((long) img->xsize) * img->ysize * sizeof(GifByteType);
-
-
- if ((OutputColorMap = MakeMapObject(ColorMapSize, NULL)) == NULL)
- m_fatal(0,"Failed to allocate memory for Output colormap.");
- /* if ((OutputBuffer = (GifByteType *) mymalloc(im->xsize * im->ysize * sizeof(GifByteType))) == NULL)
- m_fatal(0,"Failed to allocate memory for output buffer.");*/
-
- /* ******************************************************* */
- /* count the number of colours in the image */
- colours_in=i_count_colors(img, OutputColorMap->ColorCount);
-
- if(colours_in != -1) { /* less then the number wanted */
- /* so we copy them over as-is */
- mm_log((2,"image has %d colours, which fits in %d. Copying\n",
- colours_in,ColorMapSize));
- quant_replicate(img, out, quant);
- /* saves the colors, so don't fall through */
- return;
- } else {
-
- mm_log((2,"image has %d colours, more then %d. Quantizing\n",colours_in,ColorMapSize));
-
- if (img->channels >= 3) {
- if ((RedBuffer = (GifByteType *) mymalloc((unsigned int) Size)) == NULL) {
- m_fatal(0,"Failed to allocate memory required, aborted.");
- return;
- }
- if ((GreenBuffer = (GifByteType *) mymalloc((unsigned int) Size)) == NULL) {
- m_fatal(0,"Failed to allocate memory required, aborted.");
- free(RedBuffer);
- return;
- }
-
- if ((BlueBuffer = (GifByteType *) mymalloc((unsigned int) Size)) == NULL) {
- m_fatal(0,"Failed to allocate memory required, aborted.");
- free(RedBuffer);
- free(GreenBuffer);
- return;
- }
-
- RedP = RedBuffer;
- GreenP = GreenBuffer;
- BlueP = BlueBuffer;
-
- for (y=0; y< img->ysize; y++) for (x=0; x < img->xsize; x++) {
- i_gpix(img,x,y,&col);
- *RedP++ = col.rgb.r;
- *GreenP++ = col.rgb.g;
- *BlueP++ = col.rgb.b;
- }
-
- } else {
-
- if ((RedBuffer = (GifByteType *) mymalloc((unsigned int) Size))==NULL) {
- m_fatal(0,"Failed to allocate memory required, aborted.");
- return;
- }
-
- GreenBuffer=BlueBuffer=RedBuffer;
- RedP = RedBuffer;
- for (y=0; y< img->ysize; y++) for (x=0; x < img->xsize; x++) {
- i_gpix(img,x,y,&col);
- *RedP++ = col.rgb.r;
- }
- }
-
- if (QuantizeBuffer(img->xsize, img->ysize, &ColorMapSize, RedBuffer, GreenBuffer, BlueBuffer,
- out, OutputColorMap->Colors) == GIF_ERROR) {
- mm_log((1,"Error in QuantizeBuffer, unable to write image.\n"));
- }
- }
-
- free(RedBuffer);
- if (img->channels == 3) { free(GreenBuffer); free(BlueBuffer); }
-
- /* copy over the color map */
- for (i = 0; i < ColorMapSize; ++i) {
- quant->mc_colors[i].rgb.r = OutputColorMap->Colors[i].Red;
- quant->mc_colors[i].rgb.g = OutputColorMap->Colors[i].Green;
- quant->mc_colors[i].rgb.b = OutputColorMap->Colors[i].Blue;
- }
- quant->mc_count = ColorMapSize;
-}
-
-static
-int
-quant_replicate(i_img *im, GifByteType *output, i_quantize *quant) {
- int x, y, alloced, r, g=0, b=0, idx ;
- i_color col;
-
- alloced=0;
- for(y=0; y<im->ysize; y++) {
- for(x=0; x<im->xsize; x++) {
-
- GET_RGB(im, x,y, r,g,b, col);
-
- for(idx=0; idx<alloced; idx++) { /* linear search for an index */
- if(quant->mc_colors[idx].rgb.r==r &&
- quant->mc_colors[idx].rgb.g==g &&
- quant->mc_colors[idx].rgb.b==b) {
- break;
- }
- }
-
- if(idx >= alloced) { /* if we haven't already, we */
- idx=alloced++; /* add the colour to the map */
- if(quant->mc_size < alloced) {
- mm_log((1,"Tried to allocate more then %d colours.\n",
- quant->mc_size));
- return 0;
- }
- quant->mc_colors[idx].rgb.r=r;
- quant->mc_colors[idx].rgb.g=g;
- quant->mc_colors[idx].rgb.b=b;
- }
- *output=idx; /* fill output buffer */
- output++; /* with colour indexes */
- }
- }
- quant->mc_count = alloced;
- return 1;
+ return result;
}
-#endif
-
static void translate_closest(i_quantize *quant, i_img *img, i_palidx *out) {
quant->perturb = 0;
translate_addi(quant, img, out);
int pdc;
} pbox;
-static void prescan(i_img **im,int count, int cnum, cvec *clr);
+static void prescan(i_img **im,int count, int cnum, cvec *clr, i_sample_t *line);
static void reorder(pbox prescan[512]);
static int pboxcmp(const pbox *a,const pbox *b);
static void boxcenter(int box,cvec *cv);
static int
pixbox(i_color *ic) { return ((ic->channel[0] & 224)<<1)+ ((ic->channel[1]&224)>>2) + ((ic->channel[2] &224) >> 5); }
+static int
+pixbox_ch(i_sample_t *chans) { return ((chans[0] & 224)<<1)+ ((chans[1]&224)>>2) + ((chans[2] &224) >> 5); }
+
static unsigned char
g_sat(int in) {
if (in>255) { return 255; }
return rand()/(RAND_MAX+1.0);
}
+#ifdef NOTEF
static
int
eucl_d(cvec* cv,i_color *cl) { return PWR2(cv->r-cl->channel[0])+PWR2(cv->g-cl->channel[1])+PWR2(cv->b-cl->channel[2]); }
+#endif
+
+static
+int
+eucl_d_ch(cvec* cv,i_sample_t *chans) {
+ return PWR2(cv->r - chans[0]) + PWR2(cv->g - chans[1])
+ + PWR2(cv->b - chans[2]);
+}
static
int
ceucl_d(i_color *c1, i_color *c2) { return PWR2(c1->channel[0]-c2->channel[0])+PWR2(c1->channel[1]-c2->channel[1])+PWR2(c1->channel[2]-c2->channel[2]); }
+static const int
+gray_samples[] = { 0, 0, 0 };
+
/*
This quantization algorithm and implementation routines are by Arnar
makemap_addi(i_quantize *quant, i_img **imgs, int count) {
cvec *clr;
int cnum, i, x, y, bst_idx=0, ld, cd, iter, currhb, img_num;
- i_color val;
+ i_sample_t *val;
float dlt, accerr;
- hashbox hb[512];
-
- clr = (cvec *)mymalloc(sizeof(cvec) * quant->mc_size);
+ hashbox *hb;
+ i_mempool mp;
+ int maxwidth = 0;
+ i_sample_t *line;
+ const int *sample_indices;
+
+ mm_log((1, "makemap_addi(quant %p { mc_count=%d, mc_colors=%p }, imgs %p, count %d)\n",
+ quant, quant->mc_count, quant->mc_colors, imgs, count));
+
+ i_mempool_init(&mp);
+
+ clr = i_mempool_alloc(&mp, sizeof(cvec) * quant->mc_size);
+ hb = i_mempool_alloc(&mp, sizeof(hashbox) * 512);
for (i=0; i < quant->mc_count; ++i) {
clr[i].r = quant->mc_colors[i].rgb.r;
clr[i].g = quant->mc_colors[i].rgb.g;
}
/* mymalloc doesn't clear memory, so I think we need this */
for (; i < quant->mc_size; ++i) {
+ /*clr[i].r = clr[i].g = clr[i].b = 0;*/
+ clr[i].dr = 0;
+ clr[i].dg = 0;
+ clr[i].db = 0;
clr[i].fixed = 0;
clr[i].mcount = 0;
}
cnum = quant->mc_size;
dlt = 1;
- prescan(imgs, count, cnum, clr);
+ for (img_num = 0; img_num < count; ++img_num) {
+ if (imgs[img_num]->xsize > maxwidth)
+ maxwidth = imgs[img_num]->xsize;
+ }
+ line = i_mempool_alloc(&mp, 3 * maxwidth * sizeof(*line));
+
+ prescan(imgs, count, cnum, clr, line);
cr_hashindex(clr, cnum, hb);
for(iter=0;iter<3;iter++) {
for (img_num = 0; img_num < count; ++img_num) {
i_img *im = imgs[img_num];
- for(y=0;y<im->ysize;y++) for(x=0;x<im->xsize;x++) {
- ld=196608;
- i_gpix(im,x,y,&val);
- currhb=pixbox(&val);
- /* printf("box = %d \n",currhb); */
- for(i=0;i<hb[currhb].cnt;i++) {
- /* printf("comparing: pix (%d,%d,%d) vec (%d,%d,%d)\n",val.channel[0],val.channel[1],val.channel[2],clr[hb[currhb].vec[i]].r,clr[hb[currhb].vec[i]].g,clr[hb[currhb].vec[i]].b); */
-
- cd=eucl_d(&clr[hb[currhb].vec[i]],&val);
- if (cd<ld) {
- ld=cd; /* shortest distance yet */
- bst_idx=hb[currhb].vec[i]; /* index of closest vector yet */
- }
- }
-
- clr[bst_idx].mcount++;
- accerr+=(ld);
- clr[bst_idx].dr+=val.channel[0];
- clr[bst_idx].dg+=val.channel[1];
- clr[bst_idx].db+=val.channel[2];
+ sample_indices = im->channels >= 3 ? NULL : gray_samples;
+ for(y=0;y<im->ysize;y++) {
+ i_gsamp(im, 0, im->xsize, y, line, sample_indices, 3);
+ val = line;
+ for(x=0;x<im->xsize;x++) {
+ ld=196608;
+ /*i_gpix(im,x,y,&val);*/
+ currhb=pixbox_ch(val);
+ /* printf("box = %d \n",currhb); */
+ for(i=0;i<hb[currhb].cnt;i++) {
+ /* printf("comparing: pix (%d,%d,%d) vec (%d,%d,%d)\n",val.channel[0],val.channel[1],val.channel[2],clr[hb[currhb].vec[i]].r,clr[hb[currhb].vec[i]].g,clr[hb[currhb].vec[i]].b); */
+
+ cd=eucl_d_ch(&clr[hb[currhb].vec[i]],val);
+ if (cd<ld) {
+ ld=cd; /* shortest distance yet */
+ bst_idx=hb[currhb].vec[i]; /* index of closest vector yet */
+ }
+ }
+
+ clr[bst_idx].mcount++;
+ accerr+=(ld);
+ clr[bst_idx].dr+=val[0];
+ clr[bst_idx].dg+=val[1];
+ clr[bst_idx].db+=val[2];
+
+ val += 3; /* next 3 samples (next pixel) */
+ }
}
}
- for(i=0;i<cnum;i++) if (clr[i].mcount) { clr[i].dr/=clr[i].mcount; clr[i].dg/=clr[i].mcount; clr[i].db/=clr[i].mcount; }
-
+
+ for(i=0;i<cnum;i++)
+ if (clr[i].mcount) {
+ clr[i].dr/=clr[i].mcount;
+ clr[i].dg/=clr[i].mcount;
+ clr[i].db/=clr[i].mcount;
+ }
+
/* for(i=0;i<cnum;i++) printf("vec(%d)=(%d,%d,%d) dest=(%d,%d,%d) matchcount=%d\n",
- i,clr[i].r,clr[i].g,clr[i].b,clr[i].dr,clr[i].dg,clr[i].db,clr[i].mcount); */
-
+ i,clr[i].r,clr[i].g,clr[i].b,clr[i].dr,clr[i].dg,clr[i].db,clr[i].mcount); */
+
/* printf("total error: %.2f\n",sqrt(accerr)); */
-
+
for(i=0;i<cnum;i++) {
if (clr[i].fixed) continue; /* skip reserved colors */
-
+
if (clr[i].mcount) {
- clr[i].used = 1;
- clr[i].r=clr[i].r*(1-dlt)+dlt*clr[i].dr;
- clr[i].g=clr[i].g*(1-dlt)+dlt*clr[i].dg;
- clr[i].b=clr[i].b*(1-dlt)+dlt*clr[i].db;
+ clr[i].used = 1;
+ clr[i].r=clr[i].r*(1-dlt)+dlt*clr[i].dr;
+ clr[i].g=clr[i].g*(1-dlt)+dlt*clr[i].dg;
+ clr[i].b=clr[i].b*(1-dlt)+dlt*clr[i].db;
} else {
- /* let's try something else */
- clr[i].used = 0;
- clr[i].r=rand();
- clr[i].g=rand();
- clr[i].b=rand();
+ /* let's try something else */
+ clr[i].used = 0;
+ clr[i].r=rand();
+ clr[i].g=rand();
+ clr[i].b=rand();
}
-
+
clr[i].dr=0;
clr[i].dg=0;
clr[i].db=0;
quant->mc_count = cnum;
#endif
- /* don't want to keep this */
- myfree(clr);
+#if 0
+ mm_log((1, "makemap_addi returns - quant.mc_count = %d\n", quant->mc_count));
+ for (i = 0; i < quant->mc_count; ++i)
+ mm_log((5, " map entry %d: (%d, %d, %d)\n", i, clr[i].r, clr[i].g, clr[i].b));
+#endif
+
+ i_mempool_destroy(&mp);
+}
+
+typedef struct {
+ i_sample_t rgb[3];
+ int count;
+} quant_color_entry;
+
+#define MEDIAN_CUT_COLORS 32768
+
+#define MED_CUT_INDEX(c) ((((c).rgb.r & 0xF8) << 7) | \
+ (((c).rgb.g & 0xF8) << 2) | (((c).rgb.b & 0xF8) >> 3))
+
+#define MED_CUT_GRAY_INDEX(c) ((((c).rgb.r & 0xF8) << 7) | \
+ (((c).rgb.r & 0xF8) << 2) | (((c).rgb.r & 0xF8) >> 3))
+
+/* scale these to cover the whole range */
+#define MED_CUT_RED(index) ((((index) & 0x7C00) >> 10) * 255 / 31)
+#define MED_CUT_GREEN(index) ((((index) & 0x3E0) >> 5) * 255 / 31)
+#define MED_CUT_BLUE(index) (((index) & 0x1F) * 255 / 31)
+
+typedef struct {
+ i_sample_t min[3]; /* minimum for each channel */
+ i_sample_t max[3]; /* maximum for each channel */
+ i_sample_t width[3]; /* width for each channel */
+ int start, size; /* beginning and size of the partition */
+ int pixels; /* number of pixels represented by this partition */
+} medcut_partition;
+
+/*
+=item calc_part(part, colors)
+
+Calculates the new color limits for the given partition.
+
+Giflib assumes that the limits for the non-split channels stay the
+same, but this strikes me as incorrect, especially if the colors tend
+to be color ramps.
+
+Of course this could be optimized by not recalculating the channel we
+just sorted on, but it's not worth the effort right now.
+
+=cut
+*/
+static void calc_part(medcut_partition *part, quant_color_entry *colors) {
+ int i, ch;
+
+ for (ch = 0; ch < 3; ++ch) {
+ part->min[ch] = 255;
+ part->max[ch] = 0;
+ }
+ for (i = part->start; i < part->start + part->size; ++i) {
+ for (ch = 0; ch < 3; ++ch) {
+ if (part->min[ch] > colors[i].rgb[ch])
+ part->min[ch] = colors[i].rgb[ch];
+ if (part->max[ch] < colors[i].rgb[ch])
+ part->max[ch] = colors[i].rgb[ch];
+ }
+ }
+ for (ch = 0; ch < 3; ++ch) {
+ part->width[ch] = part->max[ch] - part->min[ch];
+ }
+}
+
+/* simple functions to sort by each channel - we could use a global, but
+ that would be bad */
+
+static int
+color_sort_red(void const *left, void const *right) {
+ return ((quant_color_entry *)left)->rgb[0] - ((quant_color_entry *)right)->rgb[0];
+}
+
+static int
+color_sort_green(void const *left, void const *right) {
+ return ((quant_color_entry *)left)->rgb[1] - ((quant_color_entry *)right)->rgb[1];
+}
+
+static int
+color_sort_blue(void const *left, void const *right) {
+ return ((quant_color_entry *)left)->rgb[2] - ((quant_color_entry *)right)->rgb[2];
+}
+
+static int (*sorters[])(void const *, void const *) =
+{
+ color_sort_red,
+ color_sort_green,
+ color_sort_blue,
+};
+
+static void
+makemap_mediancut(i_quantize *quant, i_img **imgs, int count) {
+ quant_color_entry *colors;
+ i_mempool mp;
+ int imgn, x, y, i, ch;
+ int max_width;
+ i_color *line;
+ int color_count;
+ int total_pixels;
+ medcut_partition *parts;
+ int part_num;
+ int in, out;
+ /* number of channels we search for the best channel to partition
+ this isn't terribly efficient, but it should work */
+ int chan_count;
+
+ /*printf("images %d pal size %d\n", count, quant->mc_size);*/
+
+ i_mempool_init(&mp);
+
+ colors = i_mempool_alloc(&mp, sizeof(*colors) * MEDIAN_CUT_COLORS);
+ for (i = 0; i < MEDIAN_CUT_COLORS; ++i) {
+ colors[i].rgb[0] = MED_CUT_RED(i);
+ colors[i].rgb[1] = MED_CUT_GREEN(i);
+ colors[i].rgb[2] = MED_CUT_BLUE(i);
+ colors[i].count = 0;
+ }
+
+ max_width = -1;
+ for (imgn = 0; imgn < count; ++imgn) {
+ if (imgs[imgn]->xsize > max_width)
+ max_width = imgs[imgn]->xsize;
+ }
+ line = i_mempool_alloc(&mp, sizeof(i_color) * max_width);
+
+ /* build the stats */
+ total_pixels = 0;
+ chan_count = 1; /* assume we just have grayscale */
+ for (imgn = 0; imgn < count; ++imgn) {
+ total_pixels += imgs[imgn]->xsize * imgs[imgn]->ysize;
+ for (y = 0; y < imgs[imgn]->ysize; ++y) {
+ i_glin(imgs[imgn], 0, imgs[imgn]->xsize, y, line);
+ if (imgs[imgn]->channels > 2) {
+ chan_count = 3;
+ for (x = 0; x < imgs[imgn]->xsize; ++x) {
+ ++colors[MED_CUT_INDEX(line[x])].count;
+ }
+ }
+ else {
+ /* a gray-scale image, just use the first channel */
+ for (x = 0; x < imgs[imgn]->xsize; ++x) {
+ ++colors[MED_CUT_GRAY_INDEX(line[x])].count;
+ }
+ }
+ }
+ }
+
+ /* eliminate the empty colors */
+ out = 0;
+ for (in = 0; in < MEDIAN_CUT_COLORS; ++in) {
+ if (colors[in].count) {
+ colors[out++] = colors[in];
+ }
+ }
+ /*printf("out %d\n", out);
+
+ for (i = 0; i < out; ++i) {
+ if (colors[i].count) {
+ printf("%d: (%d,%d,%d) -> %d\n", i, colors[i].rgb[0], colors[i].rgb[1],
+ colors[i].rgb[2], colors[i].count);
+ }
+ }*/
+
+ if (out < quant->mc_size) {
+ /* just copy them into the color table */
+ for (i = 0; i < out; ++i) {
+ for (ch = 0; ch < 3; ++ch) {
+ quant->mc_colors[i].channel[ch] = colors[i].rgb[ch];
+ }
+ }
+ quant->mc_count = out;
+ }
+ else {
+ /* build the starting partition */
+ parts = i_mempool_alloc(&mp, sizeof(*parts) * quant->mc_size);
+ parts[0].start = 0;
+ parts[0].size = out;
+ parts[0].pixels = total_pixels;
+ calc_part(parts, colors);
+ color_count = 1;
+
+ while (color_count < quant->mc_size) {
+ /* initialized to avoid compiler warnings */
+ int max_index = 0, max_ch = 0; /* index/channel with biggest spread */
+ int max_size;
+ medcut_partition *workpart;
+ int cum_total;
+ int half;
+
+ /* find the partition with the most biggest span with more than
+ one color */
+ max_size = -1;
+ for (i = 0; i < color_count; ++i) {
+ for (ch = 0; ch < chan_count; ++ch) {
+ if (parts[i].width[ch] > max_size
+ && parts[i].size > 1) {
+ max_index = i;
+ max_ch = ch;
+ max_size = parts[i].width[ch];
+ }
+ }
+ }
+
+ /* nothing else we can split */
+ if (max_size == -1)
+ break;
+
+ workpart = parts+max_index;
+ /*printf("splitting partition %d (pixels %ld, start %d, size %d)\n", max_index, workpart->pixels, workpart->start, workpart->size);*/
+ qsort(colors + workpart->start, workpart->size, sizeof(*colors),
+ sorters[max_ch]);
+
+ /* find the median or something like it we need to make sure both
+ sides of the split have at least one color in them, so we don't
+ test at the first or last entry */
+ i = workpart->start;
+ cum_total = colors[i].count;
+ ++i;
+ half = workpart->pixels / 2;
+ while (i < workpart->start + workpart->size - 1
+ && cum_total < half) {
+ cum_total += colors[i++].count;
+ }
+ /*printf("Split at %d to make %d (half %ld, cumtotal %ld)\n", i, color_count, half, cum_total);*/
+
+ /* found the spot to split */
+ parts[color_count].start = i;
+ parts[color_count].size = workpart->start + workpart->size - i;
+ workpart->size = i - workpart->start;
+ parts[color_count].pixels = workpart->pixels - cum_total;
+ workpart->pixels = cum_total;
+
+ /* recalculate the limits */
+ calc_part(workpart, colors);
+ calc_part(parts+color_count, colors);
+ ++color_count;
+ }
+
+ /* fill in the color table - since we could still have partitions
+ that have more than one color, we need to average the colors */
+ for (part_num = 0; part_num < color_count; ++part_num) {
+ long sums[3];
+ medcut_partition *workpart;
+
+ workpart = parts+part_num;
+ for (ch = 0; ch < 3; ++ch)
+ sums[ch] = 0;
+
+ for (i = workpart->start; i < workpart->start + workpart->size; ++i) {
+ for (ch = 0; ch < 3; ++ch) {
+ sums[ch] += colors[i].rgb[ch] * colors[i].count;
+ }
+ }
+ for (ch = 0; ch < 3; ++ch) {
+ quant->mc_colors[part_num].channel[ch] = sums[ch] / workpart->pixels;
+ }
+ }
+ quant->mc_count = color_count;
+ }
+ /*printf("out %d colors\n", quant->mc_count);*/
+ i_mempool_destroy(&mp);
+}
+
+static void
+makemap_mono(i_quantize *quant) {
+ quant->mc_colors[0].rgba.r = 0;
+ quant->mc_colors[0].rgba.g = 0;
+ quant->mc_colors[0].rgba.b = 0;
+ quant->mc_colors[0].rgba.a = 255;
+ quant->mc_colors[1].rgba.r = 255;
+ quant->mc_colors[1].rgba.g = 255;
+ quant->mc_colors[1].rgba.b = 255;
+ quant->mc_colors[1].rgba.a = 255;
+ quant->mc_count = 2;
}
#define pboxjump 32
#define HB_SORT
/* assume i is available */
-#define CF_VARS hashbox hb[512]; \
+#define CF_VARS hashbox *hb = mymalloc(sizeof(hashbox) * 512); \
int currhb; \
long ld, cd
welcome.
*/
static void hbsetup(i_quantize *quant, hashbox *hb) {
- long *dists, mind, maxd, cd;
+ long *dists, mind, maxd;
int cr, cb, cg, hbnum, i;
i_color cenc;
#ifdef HB_SORT
#endif
}
}
- }
+ }
#ifdef HB_SORT
myfree(indices);
#endif
if (cd < ld) { ld = cd; bst_idx = hb[currhb].vec[i]; } \
}
-#define CF_CLEANUP
+#define CF_CLEANUP myfree(hb)
#endif
#endif
static void translate_addi(i_quantize *quant, i_img *img, i_palidx *out) {
- int x, y, i, k, bst_idx;
+ int x, y, i, k, bst_idx = 0;
i_color val;
int pixdev = quant->perturb;
CF_VARS;
CF_SETUP;
- if (pixdev) {
- k=0;
- for(y=0;y<img->ysize;y++) for(x=0;x<img->xsize;x++) {
- i_gpix(img,x,y,&val);
- val.channel[0]=g_sat(val.channel[0]+(int)(pixdev*frandn()));
- val.channel[1]=g_sat(val.channel[1]+(int)(pixdev*frandn()));
- val.channel[2]=g_sat(val.channel[2]+(int)(pixdev*frandn()));
- CF_FIND;
- out[k++]=bst_idx;
+ if (img->channels >= 3) {
+ if (pixdev) {
+ k=0;
+ for(y=0;y<img->ysize;y++) for(x=0;x<img->xsize;x++) {
+ i_gpix(img,x,y,&val);
+ val.channel[0]=g_sat(val.channel[0]+(int)(pixdev*frandn()));
+ val.channel[1]=g_sat(val.channel[1]+(int)(pixdev*frandn()));
+ val.channel[2]=g_sat(val.channel[2]+(int)(pixdev*frandn()));
+ CF_FIND;
+ out[k++]=bst_idx;
+ }
+ } else {
+ k=0;
+ for(y=0;y<img->ysize;y++) for(x=0;x<img->xsize;x++) {
+ i_gpix(img,x,y,&val);
+ CF_FIND;
+ out[k++]=bst_idx;
+ }
}
- } else {
- k=0;
- for(y=0;y<img->ysize;y++) for(x=0;x<img->xsize;x++) {
- i_gpix(img,x,y,&val);
- CF_FIND;
- out[k++]=bst_idx;
+ }
+ else {
+ if (pixdev) {
+ k=0;
+ for(y=0;y<img->ysize;y++) for(x=0;x<img->xsize;x++) {
+ i_gpix(img,x,y,&val);
+ val.channel[1] = val.channel[2] =
+ val.channel[0]=g_sat(val.channel[0]+(int)(pixdev*frandn()));
+ CF_FIND;
+ out[k++]=bst_idx;
+ }
+ } else {
+ k=0;
+ for(y=0;y<img->ysize;y++) for(x=0;x<img->xsize;x++) {
+ i_gpix(img,x,y,&val);
+ val.channel[1] = val.channel[2] = val.channel[0];
+ CF_FIND;
+ out[k++]=bst_idx;
+ }
}
}
CF_CLEANUP;
int errw;
int difftotal;
int x, y, dx, dy;
- int minr, maxr, ming, maxg, minb, maxb, cr, cg, cb;
- i_color find;
- int bst_idx;
+ int bst_idx = 0;
CF_VARS;
if ((quant->errdiff & ed_mask) == ed_custom) {
long ld, cd;
errdiff_t perr;
i_gpix(img, x, y, &val);
+ if (img->channels < 3) {
+ val.channel[1] = val.channel[2] = val.channel[0];
+ }
perr = err[x+mapo];
perr.r = perr.r < 0 ? -((-perr.r)/difftotal) : perr.r/difftotal;
perr.g = perr.g < 0 ? -((-perr.g)/difftotal) : perr.g/difftotal;
memset(err+(maph-1)*errw, 0, sizeof(*err)*errw);
}
CF_CLEANUP;
+ myfree(err);
}
/* Prescan finds the boxes in the image that have the highest number of colors
and that result is used as the initial value for the vectores */
-static void prescan(i_img **imgs,int count, int cnum, cvec *clr) {
+static void prescan(i_img **imgs,int count, int cnum, cvec *clr, i_sample_t *line) {
int i,k,j,x,y;
- i_color val;
+ i_sample_t *val;
+ const int *chans;
pbox prebox[512];
for(i=0;i<512;i++) {
/* process each image */
for (i = 0; i < count; ++i) {
i_img *im = imgs[i];
- for(y=0;y<im->ysize;y++) for(x=0;x<im->xsize;x++) {
- i_gpix(im,x,y,&val);
- prebox[pixbox(&val)].pixcnt++;
+ chans = im->channels >= 3 ? NULL : gray_samples;
+ for(y=0;y<im->ysize;y++) {
+ i_gsamp(im, 0, im->xsize, y, line, chans, 3);
+ val = line;
+ for(x=0;x<im->xsize;x++) {
+ prebox[pixbox_ch(val)].pixcnt++;
+ }
}
}
bbox(boxnum,&r0,&r1,&g0,&g1,&b0,&b1);
- mr=max(abs(b-b0),abs(b-b1));
- mg=max(abs(g-g0),abs(g-g1));
- mb=max(abs(r-r0),abs(r-r1));
+ mr=i_max(abs(b-b0),abs(b-b1));
+ mg=i_max(abs(g-g0),abs(g-g1));
+ mb=i_max(abs(r-r0),abs(r-r1));
return PWR2(mr)+PWR2(mg)+PWR2(mb);
}
if (r0<=r && r<=r1 && g0<=g && g<=g1 && b0<=b && b<=b1) return 0;
- mr=min(abs(b-b0),abs(b-b1));
- mg=min(abs(g-g0),abs(g-g1));
- mb=min(abs(r-r0),abs(r-r1));
+ mr=i_min(abs(b-b0),abs(b-b1));
+ mg=i_min(abs(g-g0),abs(g-g1));
+ mb=i_min(abs(r-r0),abs(r-r1));
mr=PWR2(mr);
mg=PWR2(mg);
static void transparent_errdiff(i_quantize *, i_palidx *, i_img *, i_palidx);
static void transparent_ordered(i_quantize *, i_palidx *, i_img *, i_palidx);
-void quant_transparent(i_quantize *quant, i_palidx *data, i_img *img,
+/*
+=item i_quant_transparent(C<quant>, C<data>, C<img>, C<trans_index>)
+
+=category Image quantization
+
+Dither the alpha channel on C<img> into the palette indexes in
+C<data>. Pixels to be transparent are replaced with C<trans_pixel>.
+
+The method used depends on the tr_* members of C<quant>.
+
+=cut
+*/
+
+void
+i_quant_transparent(i_quantize *quant, i_palidx *data, i_img *img,
i_palidx trans_index)
{
switch (quant->transp) {
i_palidx trans_index)
{
int x, y;
+ i_sample_t *line = mymalloc(img->xsize * sizeof(i_sample_t));
+ int trans_chan = img->channels > 2 ? 3 : 1;
for (y = 0; y < img->ysize; ++y) {
+ i_gsamp(img, 0, img->xsize, y, line, &trans_chan, 1);
for (x = 0; x < img->xsize; ++x) {
- i_color val;
- i_gpix(img, x, y, &val);
- if (val.rgba.a < quant->tr_threshold)
+ if (line[x] < quant->tr_threshold)
data[y*img->xsize+x] = trans_index;
}
}
+ myfree(line);
}
static void
int errw, *err, *errp;
int difftotal, out, error;
int x, y, dx, dy, i;
+ i_sample_t *line;
+ int trans_chan = img->channels > 2 ? 3 : 1;
/* no custom map for transparency (yet) */
index = quant->tr_errdiff & ed_mask;
errp = err+mapo;
memset(err, 0, sizeof(*err) * maph * errw);
+ line = mymalloc(img->xsize * sizeof(i_sample_t));
difftotal = 0;
for (i = 0; i < maph * mapw; ++i)
difftotal += map[i];
for (y = 0; y < img->ysize; ++y) {
+ i_gsamp(img, 0, img->xsize, y, line, &trans_chan, 1);
for (x = 0; x < img->xsize; ++x) {
- i_color val;
- i_gpix(img, x, y, &val);
- val.rgba.a = g_sat(val.rgba.a-errp[x]/difftotal);
- if (val.rgba.a < 128) {
+ line[x] = g_sat(line[x]-errp[x]/difftotal);
+ if (line[x] < 128) {
out = 0;
data[y*img->xsize+x] = trans_index;
}
else {
out = 255;
}
- error = out - val.rgba.a;
+ error = out - line[x];
for (dx = 0; dx < mapw; ++dx) {
for (dy = 0; dy < maph; ++dy) {
errp[x+dx-mapo+dy*errw] += error * map[dx+mapw*dy];
memcpy(err+dy*errw, err+(dy+1)*errw, sizeof(*err)*errw);
memset(err+(maph-1)*errw, 0, sizeof(*err)*errw);
}
+ myfree(err);
+ myfree(line);
}
/* builtin ordered dither maps */
-unsigned char orddith_maps[][64] =
+static unsigned char
+orddith_maps[][64] =
{
{ /* random
this is purely random - it's pretty awful
{
unsigned char *spot;
int x, y;
+ i_sample_t *line;
+ int trans_chan = img->channels > 2 ? 3 : 1;
if (quant->tr_orddith == od_custom)
spot = quant->tr_custom;
else
spot = orddith_maps[quant->tr_orddith];
+
+ line = mymalloc(img->xsize * sizeof(i_sample_t));
for (y = 0; y < img->ysize; ++y) {
+ i_gsamp(img, 0, img->xsize, y, line, &trans_chan, 1);
for (x = 0; x < img->xsize; ++x) {
- i_color val;
- i_gpix(img, x, y, &val);
- if (val.rgba.a < spot[(x&7)+(y&7)*8])
+ if (line[x] < spot[(x&7)+(y&7)*8])
data[x+y*img->xsize] = trans_index;
}
}
+ myfree(line);
}
+
projects / imager.git / blobdiff