ref: 9eaba52cafcac7c2f3bfc72d7be1f15893196be1
dir: /DoConfig/fltk/src/ps_image.cxx/
//
// "$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];
}
extern uchar **fl_mask_bitmap;
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;
fl_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;
fl_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 $"
//