#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <assert.h>
#include <math.h>
#include <fcntl.h>
#include <zlib.h>
+#include <limits.h>
#ifdef EXPORT
#undef EXPORT
return 0;
}
if(a!=8 && (b==2 || b==6)) {
- printf("Bpp %d in mode %d not supported!\n", a);
+ printf("Bpp %d in mode %d not supported!\n", b, a);
return 0;
}
if(c!=0) {
}
if(!png_read_header(fi, &header)) {
+ fclose(fi);
return 0;
}
return 1;
}
+static char hasAlpha(unsigned char*_image, int size)
+{
+ COL*image = (COL*)_image;
+ int t;
+ for(t=0;t<size;t++) {
+ if(image[t].a!=255)
+ return 1;
+ }
+ return 0;
+}
+
+typedef struct {
+ u32 num;
+ u32 color;
+} colornum_t;
+
+static int compare_colors(const void*_c1, const void*_c2) {
+ colornum_t*c1 = (colornum_t*)_c1;
+ colornum_t*c2 = (colornum_t*)_c2;
+ return c2->num - c1->num;
+}
+
+static colornum_t* getColors(COL*image, int size, int*num)
+{
+ unsigned char*colexists = malloc((256*256*256)/8);
+ memset(colexists, 0, (256*256*256)/8);
+ int t;
+ int count=0;
+
+ /* find all different colors in the image */
+ for(t=0;t<size;t++) {
+ int index = (image[t].r)|(image[t].g)<<8|(image[t].b)<<16;
+ if(!(colexists[index/8]&(1<<(index&7)))) {
+ count++;
+ colexists[index/8]|=(1<<(index&7));
+ }
+ }
+
+ /* now store them in an array */
+ colornum_t*colors=(colornum_t*)malloc(sizeof(colornum_t)*count);
+ int pos=0;
+ for(t=0;t<256*256*256;t++) {
+ if(colexists[t/8]&(1<<(t&7))) {
+ colors[pos].color = t;
+ colors[pos].num = 0;
+ pos++;
+ }
+ }
+
+ /* next, count how often each color occurs */
+ for(t=0;t<size;t++) {
+ int col = (image[t].r)|(image[t].g)<<8|(image[t].b)<<16;
+ int min,max,i,l;
+ for(min=0, max=count, i=count/2, l=count; i != l; l=i,i=(min+max)/2) {
+ // binary search
+ if(colors[i].color >= col) max=i;
+ else min=i+1;
+ }
+ assert(colors[i].color==col);
+ colors[i].num++;
+ }
+ free(colexists);
+ *num = count;
+ return colors;
+}
+
+static void getOptimalPalette(COL*image, int size, int palettesize, COL*palette)
+{
+ int num;
+ memset(palette, 0, sizeof(COL)*256);
+ colornum_t*colors = getColors(image, size, &num);
+
+ assert(palettesize<=256);
+
+ qsort(colors, num, sizeof(colornum_t), compare_colors);
+
+ if(num<=palettesize) {
+ /* if there are not more than palettesize different colors in
+ the image anyway, we are done */
+ int t;
+ for(t=0;t<num;t++) {
+ palette[t].r = colors[t].color;
+ palette[t].g = colors[t].color>>8;
+ palette[t].b = colors[t].color>>16;
+ palette[t].a = 255;
+ }
+ return;
+ }
+
+ if(num>2048) {
+ /* if there are too many different colors, pick the ones that
+ occur most often */
+ num = 2048;
+ }
+
+ colornum_t*centers = malloc(sizeof(colornum_t)*palettesize);
+ int t;
+ for(t=0;t<palettesize;t++) {
+ centers[t].color = colors[t].color;
+ }
+ unsigned char*belongsto = (unsigned char*)malloc(num);
+ memset(belongsto, 0, num);
+ /* do a k-means clustering on the colors */
+ char change = 1;
+ int tries = 0;
+ while(change) {
+ if(tries++ >= (palettesize+num)*2) {
+ fprintf(stderr, "Warning: didn't find optimal palette\n");
+ break;
+ }
+ change = 0;
+ int s,t;
+ for(s=0;s<palettesize;s++) {
+ centers[s].num = 0;
+ }
+ for(t=0;t<num;t++) {
+ int best=0x7fffffff;
+ int bestpos=0;
+ for(s=0;s<palettesize;s++) {
+ int distance = 0;
+ distance += abs((centers[s].color>>0&0xff) - (colors[t].color>>0&0xff));
+ distance += abs((centers[s].color>>8&0xff) - (colors[t].color>>8&0xff));
+ distance += abs((centers[s].color>>16&0xff) - (colors[t].color>>16&0xff));
+ distance *= colors[t].num;
+ if(distance<best) {
+ best = distance;
+ bestpos = s;
+ }
+ }
+ if(bestpos!=belongsto[t])
+ change = 1;
+ belongsto[t] = bestpos;
+ }
+ for(s=0;s<palettesize;s++) {
+ int r=0;
+ int g=0;
+ int b=0;
+ int count=0;
+ for(t=0;t<num;t++) {
+ if(belongsto[t]==s) {
+ r += ((colors[t].color>>0)&0xff)*colors[t].num;
+ g += ((colors[t].color>>8)&0xff)*colors[t].num;
+ b += ((colors[t].color>>16)&0xff)*colors[t].num;
+ count+=colors[t].num;
+ }
+ }
+ if(!count) {
+ int random = rand()%num;
+ centers[s].color = colors[random].color;
+ centers[s].num = 0;
+ change = 1;
+ } else {
+ r /= count;
+ g /= count;
+ b /= count;
+ centers[s].color = r|g<<8|b<<16;
+ centers[s].num = count;
+ }
+ }
+ }
+ free(belongsto);
+ free(colors);
+ for(t=0;t<palettesize;t++) {
+ palette[t].r = centers[t].color;
+ palette[t].g = centers[t].color>>8;
+ palette[t].b = centers[t].color>>16;
+ palette[t].a = 255;
+ }
+ free(centers);
+}
+
+static int sqr(const int x) {return x*x;}
+
+static void png_quantize_image(unsigned char*_image, int size, int numcolors, unsigned char**newimage, COL*palette)
+{
+ COL*image = (COL*)_image;
+ getOptimalPalette(image, size, numcolors, palette);
+ *newimage = (unsigned char*)malloc(size);
+ int t;
+ for(t=0;t<size;t++) {
+ int best=0x7fffffff;
+ int bestcol = 0;
+ int s;
+ for(s=0;s<numcolors;s++) {
+ int distance = 0;
+ distance += sqr((palette[s].r) - (image[t].r))*5;
+ distance += sqr((palette[s].g) - (image[t].g))*6;
+ distance += sqr((palette[s].b) - (image[t].b))*4;
+ if(distance<best) {
+ best = distance;
+ bestcol = s;
+ }
+ }
+ (*newimage)[t] = bestcol;
+ }
+}
+
static u32 mycrc32;
static u32*crc32_table = 0;
return size;
}
-static void filter_line(int filtermode, unsigned char*dest, unsigned char*src, int width)
+static inline u32 color_hash(COL*col)
+{
+ u32 col32 = *(u32*)col;
+ u32 hash = (col32 >> 17) ^ col32;
+ hash ^= ((hash>>8) + 1) ^ hash;
+ return hash;
+}
+
+static int png_get_number_of_palette_entries(COL*img, int width, int height, COL*palette, char*has_alpha)
+{
+ int len = width*height;
+ int t;
+ int palsize = 0;
+ int size[256];
+ int palette_overflow = 0;
+ u32 lastcol32 = 0;
+
+ memset(size, 0, sizeof(size));
+
+ u32*pal = (u32*)malloc(65536*sizeof(u32));
+ int*count = (int*)malloc(65536*sizeof(int));
+
+ assert(sizeof(COL)==sizeof(u32));
+ assert(width && height);
+
+ lastcol32 = (*(u32*)&img[0])^0xffffffff; // don't match
+
+ for(t=0;t<len;t++) {
+ u32 col32 = *(u32*)&img[t];
+ if(col32 == lastcol32)
+ continue;
+
+ if(img[t].a!=255)
+ *has_alpha=1;
+ int i;
+
+ u32 hash = color_hash(&img[t])&255;
+
+ int csize = size[hash];
+ u32*cpal = &pal[hash*256];
+ int*ccount = &count[hash*256];
+ for(i=0;i<csize;i++) {
+ if(col32 == cpal[i]) {
+ ccount[i]++;
+ break;
+ }
+ }
+ if(i==csize) {
+ if(palsize==256) {
+ palette_overflow = 1;
+ break;
+ }
+ count[size[hash]] = 1;
+ cpal[size[hash]++] = col32;
+ palsize++;
+ }
+ lastcol32 = col32;
+ }
+ if(palette_overflow) {
+ free(pal);
+ *has_alpha=1;
+ return width*height;
+ }
+ if(palette) {
+ int i = 0;
+ int occurences[256];
+ for(t=0;t<256;t++) {
+ int s;
+ int csize = size[t];
+ u32* cpal = &pal[t*256];
+ int* ccount = &count[t*256];
+ for(s=0;s<csize;s++) {
+ occurences[i] = ccount[s];
+ palette[i++] = *(COL*)(&cpal[s]);
+ }
+ }
+ assert(i==palsize);
+ int j;
+ for(i=0;i<palsize-1;i++) {
+ for(j=i+1;j<palsize;j++) {
+ if(occurences[j] < occurences[i]) {
+ int o = occurences[i];
+ COL c = palette[i];
+ occurences[i] = occurences[j];
+ palette[i] = palette[j];
+ occurences[j] = o;
+ palette[j] = c;
+ }
+ }
+ }
+ }
+ free(pal);
+ free(count);
+ return palsize;
+}
+
+static void png_map_to_palette(COL*src, unsigned char*dest, int size, COL*palette, int palette_size)
+{
+ int t;
+ int palette_hash[1024];
+ memset(palette_hash, 0, sizeof(int)*1024);
+
+ for(t=0;t<palette_size;t++) {
+ u32 hash = color_hash(&palette[t])&1023;
+ while(palette_hash[hash])
+ hash = (hash+1)&1023;
+ palette_hash[hash] = t;
+ }
+
+ for(t=0;t<size;t++) {
+ u32 hash = color_hash(&src[t]);
+ int index = 0;
+ while(1) {
+ hash&=1023;
+ index = palette_hash[hash];
+ if(!memcmp(&palette[index], &src[t], sizeof(COL)))
+ break;
+ hash++;
+ }
+ dest[t] = palette_hash[hash];
+ }
+}
+
+static int png_apply_specific_filter_8(int filtermode, unsigned char*dest, unsigned char*src, int width)
+{
+ int pos2 = 0;
+ int pos = 0;
+ int srcwidth = width;
+ int x;
+ if(filtermode == 0) {
+ for(x=0;x<width;x++) {
+ dest[pos2++]=src[pos++]; //alpha
+ }
+ } else if(filtermode == 1) {
+ /* x difference filter */
+ dest[pos2++]=src[pos++];
+ for(x=1;x<width;x++) {
+ dest[pos2++]=src[pos] - src[pos-1];
+ pos++;
+ }
+ } else if(filtermode == 2) {
+ /* y difference filter */
+ for(x=0;x<width;x++) {
+ dest[pos2++]=src[pos+0] - src[pos-srcwidth+0]; //alpha
+ pos++;
+ }
+ } else if(filtermode == 3) {
+ dest[pos2++]=src[pos+0] - src[pos-srcwidth+0]/2;
+ pos++;
+ /* x+y difference filter */
+ for(x=1;x<width;x++) {
+ dest[pos2++]=src[pos+0] - (src[pos-1+0] + src[pos-srcwidth+0])/2; //alpha
+ pos++;
+ }
+ } else if(filtermode == 4) {
+ dest[pos2++]=src[pos+0] - PaethPredictor(0, src[pos-srcwidth+0], 0);
+ pos++;
+ /* paeth difference filter */
+ for(x=1;x<width;x++) {
+ dest[pos2++]=src[pos+0] - PaethPredictor(src[pos-1+0], src[pos-srcwidth+0], src[pos-1-srcwidth+0]);
+ pos++;
+ }
+ }
+ return filtermode;
+}
+
+static int png_apply_specific_filter_32(int filtermode, unsigned char*dest, unsigned char*src, int width)
{
int pos2 = 0;
int pos = 0;
pos+=4;
}
}
+ return filtermode;
}
+
+static int*num_bits_table = 0;
-EXPORT void writePNG(const char*filename, unsigned char*data, int width, int height)
+static void make_num_bits_table()
+{
+ if(num_bits_table) return;
+ num_bits_table = malloc(sizeof(num_bits_table[0])*256);
+ int t;
+ for(t=0;t<256;t++) {
+ int bits=0;
+ int v = t;
+ while(v) {
+ bits++;
+ v&=v-1;
+ }
+ num_bits_table[t]=bits;
+ }
+}
+
+static int png_apply_filter(unsigned char*dest, unsigned char*src, int width, int y, int bpp)
+{
+ make_num_bits_table();
+
+ int num_filters = y>0?5:2; //don't apply y-direction filter in first line
+ int f;
+ int best_nr = 0;
+ int best_energy = INT_MAX;
+ int w = width*(bpp/8);
+ unsigned char* pairs = malloc(8192);
+ assert(bpp==8 || bpp==32);
+ for(f=0;f<num_filters;f++) {
+ if(bpp==8)
+ png_apply_specific_filter_8(f, dest, src, width);
+ else
+ png_apply_specific_filter_32(f, dest, src, width);
+ int x;
+
+ /* approximation for zlib compressability: test how many different
+ (byte1,byte2) occur */
+ memset(pairs, 0, 8192);
+ int different_pairs = 0;
+ for(x=0;x<w-1;x++) {
+ int v = dest[x+1]<<8|dest[x];
+ int p = v>>3;
+ int b = 1<<(v&7);
+ if(!pairs[p]&b) {
+ pairs[p]|=b;
+ different_pairs ++;
+ }
+ }
+ int energy = different_pairs;
+ if(energy<best_energy) {
+ best_nr = f;
+ best_energy = energy;
+ }
+ }
+ if(bpp==8)
+ png_apply_specific_filter_8(best_nr, dest, src, width);
+ else
+ png_apply_specific_filter_32(best_nr, dest, src, width);
+ free(pairs);
+ return best_nr;
+}
+
+int png_apply_filter_8(unsigned char*dest, unsigned char*src, int width, int y)
+{
+ return png_apply_filter(dest, src, width, y, 8);
+}
+int png_apply_filter_32(unsigned char*dest, unsigned char*src, int width, int y)
+{
+ return png_apply_filter(dest, src, width, y, 32);
+}
+
+EXPORT void savePNG(const char*filename, unsigned char*data, int width, int height, int numcolors)
{
FILE*fi;
int crc;
unsigned char format;
unsigned char tmp;
unsigned char* data2=0;
- u32 datalen;
- u32 datalen2;
unsigned char head[] = {137,80,78,71,13,10,26,10}; // PNG header
int cols;
char alpha = 1;
u32 tmp32;
int bpp;
int ret;
+ char has_alpha=0;
z_stream zs;
+ COL palette[256];
make_crc32_table();
- bpp = 32;
- cols = 0;
- format = 5;
+ if(!numcolors) {
+ int num = png_get_number_of_palette_entries((COL*)data, width, height, palette, &has_alpha);
+ if(num<=255) {
+ //printf("image has %d different colors (alpha=%d)\n", num, has_alpha);
+ data2 = malloc(width*height);
+ png_map_to_palette((COL*)data, data2, width*height, palette, num);
+ data = data2;
+ bpp = 8;
+ cols = num;
+ format = 3;
+ } else {
+ bpp = 32;
+ cols = 0;
+ format = 5;
+ }
+ } else {
+ bpp = 8;
+ cols = numcolors;
+ format = 3;
+ png_quantize_image(data, width*height, numcolors, &data, palette);
+ }
- datalen = (width*height*bpp/8+cols*8);
-
fi = fopen(filename, "wb");
if(!fi) {
perror("open");
png_write_byte(fi,0); //interlace mode
png_end_chunk(fi);
-/* if(format == 3) {
- png_start_chunk(fi, "PLTE", 768);
-
- for(t=0;t<256;t++) {
- png_write_byte(fi,palette[t].r);
- png_write_byte(fi,palette[t].g);
- png_write_byte(fi,palette[t].b);
- }
+ if(format == 3) {
+ png_start_chunk(fi, "PLTE", cols*3);
+ for(t=0;t<cols;t++) {
+ png_write_byte(fi,palette[t].r);
+ png_write_byte(fi,palette[t].g);
+ png_write_byte(fi,palette[t].b);
+ }
png_end_chunk(fi);
- }*/
+
+ if(has_alpha) {
+ png_start_chunk(fi, "tRNS", cols);
+ for(t=0;t<cols;t++) {
+ png_write_byte(fi,palette[t].a);
+ }
+ png_end_chunk(fi);
+ }
+ }
+
long idatpos = png_start_chunk(fi, "IDAT", 0);
memset(&zs,0,sizeof(z_stream));
zs.opaque = Z_NULL;
zs.next_out = writebuf;
zs.avail_out = ZLIB_BUFFER_SIZE;
- ret = deflateInit(&zs, Z_NO_COMPRESSION);
+ ret = deflateInit(&zs, Z_BEST_COMPRESSION);
if (ret != Z_OK) {
fprintf(stderr, "error in deflateInit(): %s", zs.msg?zs.msg:"unknown");
return;
long idatsize = 0;
{
int x,y;
- int srcwidth = width * (bpp/8);
- int linelen = 1 + ((srcwidth+3)&~3);
+ int bypp = bpp/8;
+ int srcwidth = width * bypp;
+ int linelen = 1 + srcwidth;
+ if(bypp==2)
+ linelen = 1 + ((srcwidth+1)&~1);
+ else if(bypp==3)
+ linelen = 1 + ((srcwidth+2)/3)*3;
+ else if(bypp==4)
+ linelen = 1 + ((srcwidth+3)&~3);
unsigned char* line = (unsigned char*)malloc(linelen);
- unsigned char* bestline = (unsigned char*)malloc(linelen);
memset(line, 0, linelen);
+#if 0
+ unsigned char* bestline = (unsigned char*)malloc(linelen);
+ memset(bestline, 0, linelen);
for(y=0;y<height;y++)
{
int filtermode;
int bestsize = 0x7fffffff;
- for(filtermode=0;filtermode<=0;filtermode++) {
-
+ for(filtermode=0;filtermode<=4;filtermode++) {
if(!y && filtermode>=2)
continue; // don't do y direction filters in the first row
line[0]=filtermode; //filter type
- filter_line(filtermode, line+1, &data[y*srcwidth], width);
+ if(bpp==8)
+ png_apply_specific_filter_8(filtermode, line+1, &data[y*srcwidth], width);
+ else
+ png_apply_specific_filter_32(filtermode, line+1, &data[y*srcwidth], width);
int size = test_line(&zs, line, linelen);
if(size < bestsize) {
}
idatsize += compress_line(&zs, bestline, linelen, fi);
}
- free(line);free(bestline);
+ free(bestline);
+#else
+ for(y=0;y<height;y++) {
+ if(bpp==8)
+ line[0] = png_apply_filter_8(line+1, &data[y*srcwidth], width, y);
+ else
+ line[0] = png_apply_filter_32(line+1, &data[y*srcwidth], width, y);
+
+ idatsize += compress_line(&zs, line, linelen, fi);
+ }
+#endif
+ free(line);
}
idatsize += finishzlib(&zs, fi);
png_patch_len(fi, idatpos, idatsize);
png_end_chunk(fi);
free(writebuf);
- free(data2);
+ if(data2)
+ free(data2);
fclose(fi);
}
+EXPORT void writePNG(const char*filename, unsigned char*data, int width, int height)
+{
+ savePNG(filename, data, width, height, 0);
+}
+EXPORT void writePalettePNG(const char*filename, unsigned char*data, int width, int height)
+{
+ savePNG(filename, data, width, height, 256);
+}
git.asbjorn.biz / swftools.git / blobdiff