summaryrefslogtreecommitdiff
path: root/src/drivers/PostScript/Fl_PostScript_image.cxx
diff options
context:
space:
mode:
Diffstat (limited to 'src/drivers/PostScript/Fl_PostScript_image.cxx')
-rw-r--r--src/drivers/PostScript/Fl_PostScript_image.cxx674
1 files changed, 674 insertions, 0 deletions
diff --git a/src/drivers/PostScript/Fl_PostScript_image.cxx b/src/drivers/PostScript/Fl_PostScript_image.cxx
new file mode 100644
index 000000000..f6a118485
--- /dev/null
+++ b/src/drivers/PostScript/Fl_PostScript_image.cxx
@@ -0,0 +1,674 @@
+//
+// "$Id: image.cxx 4324 2005-05-09 21:47:22Z rokan $"
+//
+// Postscript image drawing implementation for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2015 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file. If this
+// file is missing or damaged, see the license at:
+//
+// http://www.fltk.org/COPYING.php
+//
+// Please report all bugs and problems on the following page:
+//
+// http://www.fltk.org/str.php
+//
+
+#ifndef FL_DOXYGEN
+
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+
+#include <FL/Fl_PostScript.H>
+#include <FL/Fl.H>
+#include <FL/Fl_Pixmap.H>
+#include <FL/Fl_Bitmap.H>
+
+
+//
+// Implementation of the /ASCII85Encode PostScript filter
+// as described in "PostScript LANGUAGE REFERENCE third edition" p. 131
+//
+struct struct85 {
+ uchar bytes4[4]; // holds up to 4 input bytes
+ int l4; // # of unencoded input bytes
+ int blocks; // counter to insert newlines after 80 output characters
+ uchar chars5[5]; // holds 5 output characters
+};
+
+
+void *Fl_PostScript_Graphics_Driver::prepare85() // prepare to produce ASCII85-encoded output
+{
+ struct85 *big = new struct85;
+ big->l4 = 0;
+ big->blocks = 0;
+ return big;
+}
+
+// ASCII85-encodes 4 input bytes from bytes4 into chars5 array
+// returns # of output chars
+static int convert85(const uchar *bytes4, uchar *chars5)
+{
+ if (bytes4[0] == 0 && bytes4[1] == 0 && bytes4[2] == 0 && bytes4[3] == 0) {
+ chars5[0] = 'z';
+ return 1;
+ }
+ unsigned val = bytes4[0]*(256*256*256) + bytes4[1]*(256*256) + bytes4[2]*256 + bytes4[3];
+ chars5[0] = val / 52200625 + 33; // 52200625 = 85 to the 4th
+ val = val % 52200625;
+ chars5[1] = val / 614125 + 33; // 614125 = 85 cube
+ val = val % 614125;
+ chars5[2] = val / 7225 + 33; // 7225 = 85 squared
+ val = val % 7225;
+ chars5[3] = val / 85 + 33;
+ chars5[4] = val % 85 + 33;
+ return 5;
+}
+
+
+void Fl_PostScript_Graphics_Driver::write85(void *data, const uchar *p, int len) // sends len input bytes for ASCII85 encoding
+{
+ struct85 *big = (struct85 *)data;
+ const uchar *last = p + len;
+ while (p < last) {
+ int c = 4 - big->l4;
+ if (last-p < c) c = last-p;
+ memcpy(big->bytes4 + big->l4, p, c);
+ p += c;
+ big->l4 += c;
+ if (big->l4 == 4) {
+ c = convert85(big->bytes4, big->chars5);
+ fwrite(big->chars5, c, 1, output);
+ big->l4 = 0;
+ if (++big->blocks >= 16) { fputc('\n', output); big->blocks = 0; }
+ }
+ }
+}
+
+
+void Fl_PostScript_Graphics_Driver::close85(void *data) // stops ASCII85-encoding after processing remaining unencoded input bytes, if any
+{
+ struct85 *big = (struct85 *)data;
+ int l;
+ if (big->l4) { // # of remaining unencoded input bytes
+ l = big->l4;
+ while (l < 4) big->bytes4[l++] = 0; // complete them with 0s
+ l = convert85(big->bytes4, big->chars5); // encode them
+ if (l == 1) memset(big->chars5, '!', 5);
+ fwrite(big->chars5, big->l4 + 1, 1, output);
+ }
+ fputs("~>", output); // write EOD mark
+ delete big;
+}
+
+//
+// End of implementation of the /ASCII85Encode PostScript filter
+//
+
+//
+// Implementation of the /RunLengthEncode + /ASCII85Encode PostScript filter
+// as described in "PostScript LANGUAGE REFERENCE third edition" p. 142
+//
+
+struct struct_rle85 {
+ struct85 *data85; // aux data for ASCII85 encoding
+ uchar buffer[128]; // holds non-run data
+ int count; // current buffer length
+ int run_length; // current length of run
+};
+
+void *Fl_PostScript_Graphics_Driver::prepare_rle85() // prepare to produce RLE+ASCII85-encoded output
+{
+ struct_rle85 *rle = new struct_rle85;
+ rle->count = 0;
+ rle->run_length = 0;
+ rle->data85 = (struct85*)prepare85();
+ return rle;
+}
+
+
+void Fl_PostScript_Graphics_Driver::write_rle85(uchar b, void *data) // sends one input byte to RLE+ASCII85 encoding
+{
+ struct_rle85 *rle = (struct_rle85 *)data;
+ uchar c;
+ if (rle->run_length > 0) { // if within a run
+ if (b == rle->buffer[0] && rle->run_length < 128) { // the run can be extended
+ rle->run_length++;
+ return;
+ } else { // output the run
+ c = (uchar)(257 - rle->run_length);
+ write85(rle->data85, &c, 1); // the run-length info
+ write85(rle->data85, rle->buffer, 1); // the byte of the run
+ rle->run_length = 0;
+ }
+ }
+ if (rle->count >= 2 && b == rle->buffer[rle->count-1] && b == rle->buffer[rle->count-2]) {
+ // about to begin a run
+ if (rle->count > 2) { // there is non-run data before the run in the buffer
+ c = (uchar)(rle->count-2 - 1);
+ write85(rle->data85, &c, 1); // length of non-run data
+ write85(rle->data85, rle->buffer, rle->count-2); // non-run data
+ }
+ rle->run_length = 3;
+ rle->buffer[0] = b;
+ rle->count = 0;
+ return;
+ }
+ if (rle->count >= 128) { // the non-run buffer is full, output it
+ c = (uchar)(rle->count - 1);
+ write85(rle->data85, &c, 1); // length of non-run data
+ write85(rle->data85, rle->buffer, rle->count); // non-run data
+ rle->count = 0;
+ }
+ rle->buffer[rle->count++] = b; // add byte to end of non-run buffer
+}
+
+
+void Fl_PostScript_Graphics_Driver::close_rle85(void *data) // stop doing RLE+ASCII85 encoding
+{
+ struct_rle85 *rle = (struct_rle85 *)data;
+ uchar c;
+ if (rle->run_length > 0) { // if within a run, output it
+ c = (uchar)(257 - rle->run_length);
+ write85(rle->data85, &c, 1);
+ write85(rle->data85, rle->buffer, 1);
+ } else if (rle->count) { // output the non-run buffer, if not empty
+ c = (uchar)(rle->count - 1);
+ write85(rle->data85, &c, 1);
+ write85(rle->data85, rle->buffer, rle->count);
+ }
+ c = (uchar)128;
+ write85(rle->data85, &c, 1); // output EOD mark
+ close85(rle->data85); // close ASCII85 encoding process
+ delete rle;
+}
+
+//
+// End of implementation of the /RunLengthEncode + /ASCII85Encode PostScript filter
+//
+
+
+int Fl_PostScript_Graphics_Driver::alpha_mask(const uchar * data, int w, int h, int D, int LD){
+
+ mask = 0;
+ if ((D/2)*2 != D){ //no mask info
+ return 0;
+ }
+ int xx;
+ int i,j, k, l;
+ LD += w*D;
+ int V255=0;
+ int V0 =0;
+ int V_=0;
+ for (j=0;j<h;j++){
+ for (i=0;i<w;i++)
+ switch(data[j*LD+D*i+D-1]){
+ case 255: V255 = 1; break;
+ case 0: V0 = 1; break;
+ default: V_= 1;
+ }
+ if (V_) break;
+ };
+ if (!V_){
+ if (V0)
+ if (V255){// not true alpha, only masking
+ xx = (w+7)/8;
+ mask = new uchar[h * xx];
+ for (i=0;i<h * xx;i++) mask[i]=0;
+ for (j=0;j<h;j++)
+ for (i=0;i<w;i++)
+ if (data[j*LD+D*i+D-1])
+ mask[j*xx+i/8] |= 1 << (i % 8);
+ mx = w;
+ my = h; //mask imensions
+ return 0;
+ } else {
+ mask=0;
+ return 1; //everything masked
+ }
+ else
+ return 0;
+ }
+
+
+
+ ///// Alpha dither, generating (4*w) * 4 mask area /////
+ ///// with Floyd-Steinberg error diffusion /////
+
+ mask = new uchar[((w+1)/2) * h * 4];
+
+ for (i = 0; i<((w+1)/2) * h * 4; i++) mask[i] = 0; //cleaning
+
+
+
+ mx= w*4;
+ my=h*4; // mask dimensions
+
+ xx = (w+1)/2; // mask line width in bytes
+
+ short * errors1 = new short [w*4+2]; // two rows of dither errors
+ short * errors2 = new short [w*4+2]; // two rows of dither errors
+
+ for (i=0; i<w*4+2; i++) errors2[i] = 0; // cleaning,after first swap will become current
+ for (i=0; i<w*4+2; i++) errors1[i] = 0; // cleaning,after first swap will become current
+
+ short * current = errors1;
+ short * next = errors2;
+ short * swap;
+
+ for (j=0; j<h; j++){
+ for (l=0; l<4; ){ // generating 4 rows of mask lines for 1 RGB line
+ int jj = j*4+l;
+
+ /// mask row index
+ swap = next;
+ next = current;
+ current = swap;
+ *(next+1) = 0; // must clean the first cell, next are overriden by *1
+ for (i=0; i<w; i++){
+ for (k=0; k<4; k++){ // generating 4 x-pixels for 1 RGB
+ short error, o1, o2, o3;
+ int ii = i*4+k; // mask cell index
+ short val = data[j*LD+D*i+D-1] + current[1+ii];
+ if (val>127){
+ mask[jj*xx+ii/8] |= 1 << (ii % 8); //set mask bit
+ error = val-255;
+ }else
+ error = val;
+
+ ////// error spreading /////
+ if (error >0){
+ next[ii] += o1 = (error * 3 + 8)/16;
+ current[ii+2] += o2 = (error * 7 + 8)/16;
+ next[ii+2] = o3 =(error + 8)/16; // *1 - ok replacing (cleaning)
+ } else {
+ next[ii] += o1 = (error * 3 - 8)/16;
+ current[ii+2] += o2 = (error * 7 - 8)/16;
+ next[ii+2] = o3 = (error - 8)/16;
+ }
+ next[1+ii] += error - o1 - o2 - o3;
+ }
+ }
+ l++;
+
+ ////// backward
+
+ jj = j*4+l;
+ swap = next;
+ next = current;
+ current = swap;
+ *(next+1) = 0; // must clean the first cell, next are overriden by *1
+
+ for (i = w-1; i >= 0; i--){
+
+ for (k=3; k>=0; k--){ // generating 4 x-pixels for 1 RGB
+ short error, o1, o2, o3;
+
+ int ii = i*4+k; // mask cell index
+ short val = data[j*LD+D*i+D-1] + current[1+ii];
+ if (val>127){
+
+ mask[jj*xx+ii/8] |= 1 << (ii % 8); //set mask bit
+ error = val-255;
+ } else
+ error = val;
+
+ ////// error spreading /////
+ if (error >0){
+ next[ii+2] += o1 = (error * 3 + 8)/16;
+ current[ii] += o2 = (error * 7 + 8)/16;
+ next[ii] = o3 =(error + 8)/16; // *1 - ok replacing (cleaning)
+ } else {
+ next[ii+2] += o1 = (error * 3 - 8)/16;
+
+ current[ii] += o2 = (error * 7 - 8)/16;
+ next[ii] = o3 = (error - 8)/16;
+ }
+ next[1+ii] += error - o1 - o2 - o3;
+ }
+ }
+ l++;
+ }
+ }
+ delete[] errors1;
+ delete[] errors2;
+ return 0;
+}
+
+// bitwise inversion of all 4-bit quantities
+static const unsigned char swapped[16] = {0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};
+
+// bitwise inversion of a byte
+static inline uchar swap_byte(const uchar b) {
+ return (swapped[b & 0xF] << 4) | swapped[b >> 4];
+}
+
+
+struct callback_data {
+ const uchar *data;
+ int D, LD;
+};
+
+
+static void draw_image_cb(void *data, int x, int y, int w, uchar *buf) {
+ struct callback_data *cb_data;
+ const uchar *curdata;
+
+ cb_data = (struct callback_data*)data;
+ curdata = cb_data->data + x*cb_data->D + y*cb_data->LD;
+
+ memcpy(buf, curdata, w*cb_data->D);
+}
+
+
+void Fl_PostScript_Graphics_Driver::draw_image(const uchar *data, int ix, int iy, int iw, int ih, int D, int LD) {
+ if (D<3){ //mono
+ draw_image_mono(data, ix, iy, iw, ih, D, LD);
+ return;
+ }
+
+ struct callback_data cb_data;
+
+ if (!LD) LD = iw*D;
+
+ cb_data.data = data;
+ cb_data.D = D;
+ cb_data.LD = LD;
+
+ draw_image(draw_image_cb, &cb_data, ix, iy, iw, ih, D);
+}
+
+void Fl_PostScript_Graphics_Driver::draw_image(Fl_Draw_Image_Cb call, void *data, int ix, int iy, int iw, int ih, int D) {
+ double x = ix, y = iy, w = iw, h = ih;
+
+ int level2_mask = 0;
+ fprintf(output,"save\n");
+ int i,j,k;
+ const char * interpol;
+ if (lang_level_ > 1) {
+ if (interpolate_) interpol="true";
+ else interpol="false";
+ if (mask && lang_level_ > 2) {
+ fprintf(output, "%g %g %g %g %i %i %i %i %s CIM\n", x , y+h , w , -h , iw , ih, mx, my, interpol);
+ }
+ else if (mask && lang_level_ == 2) {
+ level2_mask = 1; // use method for drawing masked color image with PostScript level 2
+ fprintf(output, " %g %g %g %g %d %d pixmap_plot\n", x, y, w, h, iw, ih);
+ }
+ else {
+ fprintf(output, "%g %g %g %g %i %i %s CII\n", x , y+h , w , -h , iw , ih, interpol);
+ }
+ } else {
+ fprintf(output , "%g %g %g %g %i %i CI", x , y+h , w , -h , iw , ih);
+ }
+
+ int LD=iw*D;
+ uchar *rgbdata=new uchar[LD];
+ uchar *curmask=mask;
+ void *big = prepare_rle85();
+
+ if (level2_mask) {
+ for (j = ih - 1; j >= 0; j--) { // output full image data
+ call(data, 0, j, iw, rgbdata);
+ uchar *curdata = rgbdata;
+ for (i=0 ; i<iw ; i++) {
+ write_rle85(curdata[0], big); write_rle85(curdata[1], big); write_rle85(curdata[2], big);
+ curdata += D;
+ }
+ }
+ close_rle85(big); fputc('\n', output);
+ big = prepare_rle85();
+ for (j = ih - 1; j >= 0; j--) { // output mask data
+ curmask = mask + j * (my/ih) * ((mx+7)/8);
+ for (k=0; k < my/ih; k++) {
+ for (i=0; i < ((mx+7)/8); i++) {
+ write_rle85(swap_byte(*curmask), big);
+ curmask++;
+ }
+ }
+ }
+ }
+ else {
+ for (j=0; j<ih;j++) {
+ if (mask && lang_level_ > 2) { // InterleaveType 2 mask data
+ for (k=0; k<my/ih;k++) { //for alpha pseudo-masking
+ for (i=0; i<((mx+7)/8);i++) {
+ write_rle85(swap_byte(*curmask), big);
+ curmask++;
+ }
+ }
+ }
+ call(data,0,j,iw,rgbdata);
+ uchar *curdata=rgbdata;
+ for (i=0 ; i<iw ; i++) {
+ uchar r = curdata[0];
+ uchar g = curdata[1];
+ uchar b = curdata[2];
+
+ if (lang_level_<3 && D>3) { //can do mixing using bg_* colors)
+ unsigned int a2 = curdata[3]; //must be int
+ unsigned int a = 255-a2;
+ r = (a2 * r + bg_r * a)/255;
+ g = (a2 * g + bg_g * a)/255;
+ b = (a2 * b + bg_b * a)/255;
+ }
+
+ write_rle85(r, big); write_rle85(g, big); write_rle85(b, big);
+ curdata +=D;
+ }
+
+ }
+ }
+ close_rle85(big);
+ fprintf(output,"\nrestore\n");
+ delete[] rgbdata;
+}
+
+void Fl_PostScript_Graphics_Driver::draw_image_mono(const uchar *data, int ix, int iy, int iw, int ih, int D, int LD) {
+ double x = ix, y = iy, w = iw, h = ih;
+
+ fprintf(output,"save\n");
+
+ int i,j, k;
+
+ const char * interpol;
+ if (lang_level_>1){
+ if (interpolate_)
+ interpol="true";
+ else
+ interpol="false";
+ if (mask && lang_level_>2)
+ fprintf(output, "%g %g %g %g %i %i %i %i %s GIM\n", x , y+h , w , -h , iw , ih, mx, my, interpol);
+ else
+ fprintf(output, "%g %g %g %g %i %i %s GII\n", x , y+h , w , -h , iw , ih, interpol);
+ }else
+ fprintf(output , "%g %g %g %g %i %i GI", x , y+h , w , -h , iw , ih);
+
+
+ if (!LD) LD = iw*D;
+
+
+ int bg = (bg_r + bg_g + bg_b)/3;
+
+ uchar *curmask=mask;
+ void *big = prepare_rle85();
+ for (j=0; j<ih;j++){
+ if (mask){
+ for (k=0;k<my/ih;k++){
+ for (i=0; i<((mx+7)/8);i++){
+ write_rle85(swap_byte(*curmask), big);
+ curmask++;
+ }
+ }
+ }
+ const uchar *curdata=data+j*LD;
+ for (i=0 ; i<iw ; i++) {
+ uchar r = curdata[0];
+ if (lang_level_<3 && D>1) { //can do mixing
+
+ unsigned int a2 = curdata[1]; //must be int
+ unsigned int a = 255-a2;
+ r = (a2 * r + bg * a)/255;
+ }
+ write_rle85(r, big);
+ curdata +=D;
+ }
+
+ }
+ close_rle85(big);
+ fprintf(output,"restore\n");
+}
+
+
+
+void Fl_PostScript_Graphics_Driver::draw_image_mono(Fl_Draw_Image_Cb call, void *data, int ix, int iy, int iw, int ih, int D) {
+ double x = ix, y = iy, w = iw, h = ih;
+
+ fprintf(output,"save\n");
+ int i,j,k;
+ const char * interpol;
+ if (lang_level_>1){
+ if (interpolate_) interpol="true";
+ else interpol="false";
+ if (mask && lang_level_>2)
+ fprintf(output, "%g %g %g %g %i %i %i %i %s GIM\n", x , y+h , w , -h , iw , ih, mx, my, interpol);
+ else
+ fprintf(output, "%g %g %g %g %i %i %s GII\n", x , y+h , w , -h , iw , ih, interpol);
+ } else
+ fprintf(output , "%g %g %g %g %i %i GI", x , y+h , w , -h , iw , ih);
+
+ int LD=iw*D;
+ uchar *rgbdata=new uchar[LD];
+ uchar *curmask=mask;
+ void *big = prepare_rle85();
+ for (j=0; j<ih;j++){
+
+ if (mask && lang_level_>2){ // InterleaveType 2 mask data
+ for (k=0; k<my/ih;k++){ //for alpha pseudo-masking
+ for (i=0; i<((mx+7)/8);i++){
+ write_rle85(swap_byte(*curmask), big);
+ curmask++;
+ }
+ }
+ }
+ call(data,0,j,iw,rgbdata);
+ uchar *curdata=rgbdata;
+ for (i=0 ; i<iw ; i++) {
+ write_rle85(curdata[0], big);
+ curdata +=D;
+ }
+ }
+ close_rle85(big);
+ fprintf(output,"restore\n");
+ delete[] rgbdata;
+}
+
+
+////////////////////////////// Image classes //////////////////////
+
+
+void Fl_PostScript_Graphics_Driver::draw(Fl_Pixmap * pxm,int XP, int YP, int WP, int HP, int cx, int cy){
+ const char * const * di =pxm->data();
+ int w,h;
+ if (!fl_measure_pixmap(di, w, h)) return;
+ mask=0;
+ mask_bitmap(&mask);
+ mx = WP;
+ my = HP;
+ push_clip(XP, YP, WP, HP);
+ fl_draw_pixmap(di,XP -cx, YP -cy, FL_BLACK );
+ pop_clip();
+ delete[] mask;
+ mask=0;
+ mask_bitmap(0);
+}
+
+void Fl_PostScript_Graphics_Driver::draw(Fl_RGB_Image * rgb,int XP, int YP, int WP, int HP, int cx, int cy){
+ const uchar * di = rgb->array;
+ int w = rgb->w();
+ int h = rgb->h();
+ mask=0;
+ if (lang_level_>2) //when not true, not making alphamask, mixing colors instead...
+ if (alpha_mask(di, w, h, rgb->d(),rgb->ld())) return; //everthing masked, no need for painting!
+ push_clip(XP, YP, WP, HP);
+ draw_image(di, XP + cx, YP + cy, w, h, rgb->d(), rgb->ld());
+ pop_clip();
+ delete[]mask;
+ mask=0;
+}
+
+int Fl_PostScript_Graphics_Driver::draw_scaled(Fl_Image *img, int XP, int YP, int WP, int HP){
+ int X, Y, W, H;
+ clip_box(XP,YP,WP,HP,X,Y,W,H); // X,Y,W,H will give the unclipped area of XP,YP,WP,HP
+ if (W == 0 || H == 0) return 1;
+ push_no_clip(); // remove the FLTK clip that can't be rescaled
+ clocale_printf("%d %d %i %i CL\n", X, Y, W, H);
+ clocale_printf("GS %d %d TR %f %f SC GS\n", XP, YP, float(WP)/img->w(), float(HP)/img->h());
+ img->draw(0, 0, img->w(), img->h(), 0, 0);
+ clocale_printf("GR GR\n");
+ pop_clip(); // restore FLTK's clip
+ return 1;
+}
+
+void Fl_PostScript_Graphics_Driver::draw(Fl_Bitmap * bitmap,int XP, int YP, int WP, int HP, int cx, int cy){
+ const uchar * di = bitmap->array;
+ int w,h;
+ int LD=(bitmap->w()+7)/8;
+ int xx;
+
+ if (WP> bitmap->w() - cx){// to assure that it does not go out of bounds;
+ w = bitmap->w() - cx;
+ xx = (bitmap->w()+7)/8 - cx/8; //length of mask in bytes
+ }else{
+ w =WP;
+ xx = (w+7)/8 - cx/8;
+ }
+ if ( HP > bitmap->h()-cy)
+ h = bitmap->h() - cy;
+ else
+ h = HP;
+
+ di += cy*LD + cx/8;
+ int si = cx % 8; // small shift to be clipped, it is simpler than shifting whole mask
+
+ int i,j;
+ push_clip(XP, YP, WP, HP);
+ fprintf(output , "%i %i %i %i %i %i MI\n", XP - si, YP + HP , WP , -HP , w , h);
+
+ void *rle85 = prepare_rle85();
+ for (j=0; j<HP; j++){
+ for (i=0; i<xx; i++){
+ write_rle85(swap_byte(*di), rle85);
+ di++;
+ }
+ }
+ close_rle85(rle85); fputc('\n', output);
+ pop_clip();
+}
+
+#endif // FL_DOXYGEN
+
+//
+// End of "$Id: image.cxx 4324 2005-05-09 21:47:22Z rokan $"
+//
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-08 11:16:39 +0000