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fltk/src/ps_image.cxx
Manolo Gouy 1366cc68d3 PostScript support: simplified the Fl_PostScript_Graphics_Driver class by removing the 
draw_scaled_image(_mono)() member functions.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8528 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
2011-03-22 17:41:23 +00:00

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//
// "$Id: image.cxx 4324 2005-05-09 21:47:22Z rokan $"
//
// Postscript image drawing implementation for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// 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>
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;
void Fl_PostScript_Graphics_Driver::draw_image(const uchar *data, int ix, int iy, int iw, int ih, int D, int LD) {
double x = ix, y = iy, w = iw, h = ih;
if (D<3){ //mono
draw_image_mono(data, ix, iy, iw, ih, D, LD);
return;
}
int i,j, k;
fprintf(output,"save\n");
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
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);
if (!LD) LD = iw*D;
uchar *curmask=mask;
for (j=0; j<ih;j++){
if (mask){
for (k=0;k<my/ih;k++){
for (i=0; i<((mx+7)/8);i++){
if (!(i%80)) fprintf(output, "\n");
fprintf(output, "%.2x",swap_byte(*curmask));
curmask++;
}
fprintf(output,"\n");
}
}
const uchar *curdata=data+j*LD;
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;
}
if (!(i%40)) fprintf(output, "\n");
fprintf(output, "%.2x%.2x%.2x", r, g, b);
curdata +=D;
}
fprintf(output,"\n");
}
fprintf(output," >\nrestore\n" );
}
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;
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++) {
if (!(i%20)) fputs("\n", output);
fprintf(output, "%.2x%.2x%.2x", curdata[0], curdata[1], curdata[2]);
curdata += D;
}
fputs("\n", output);
}
fputs(">\n", output);
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++) {
if (!(i%40)) fputs("\n", output);
fprintf(output, "%.2x",swap_byte(*curmask));
curmask++;
}
fputs("\n", output);
}
}
fputs(">\n", output);
}
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++) {
if (!(i%40)) fputs("\n", output);
fprintf(output, "%.2x",swap_byte(*curmask));
curmask++;
}
fprintf(output,"\n");
}
}
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 (!(i%40)) fputs("\n", output);
fprintf(output, "%.2x%.2x%.2x", r, g, b);
curdata +=D;
}
fputs("\n", output);
}
fputs(">\n", output);
}
fprintf(output,"restore\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;
for (j=0; j<ih;j++){
if (mask){
for (k=0;k<my/ih;k++){
for (i=0; i<((mx+7)/8);i++){
if (!(i%80)) fprintf(output, "\n");
fprintf(output, "%.2x",swap_byte(*curmask));
curmask++;
}
fprintf(output,"\n");
}
}
const uchar *curdata=data+j*LD;
for (i=0 ; i<iw ; i++) {
if (!(i%80)) fprintf(output, "\n");
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;
}
if (!(i%120)) fprintf(output, "\n");
fprintf(output, "%.2x", r);
curdata +=D;
}
fprintf(output,"\n");
}
fprintf(output," >\nrestore\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;
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++){
if (!(i%40)) fprintf(output, "\n");
fprintf(output, "%.2x",swap_byte(*curmask));
curmask++;
}
fprintf(output,"\n");
}
}
call(data,0,j,iw,rgbdata);
uchar *curdata=rgbdata;
for (i=0 ; i<iw ; i++) {
uchar r = curdata[0];
if (!(i%120)) fprintf(output, "\n");
fprintf(output, "%.2x", r);
curdata +=D;
}
fprintf(output,"\n");
}
fprintf(output,">\n");
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;
}
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", XP - si, YP + HP , WP , -HP , w , h);
for (j=0; j<HP; j++){
for (i=0; i<xx; i++){
if (!(i%80)) fprintf(output, "\n"); // not have lines longer than 255 chars
fprintf(output, "%.2x", swap_byte(*di) );
di++;
}
fprintf(output,"\n");
}
fprintf(output,">\n");
pop_clip();
}
#endif // FL_DOXYGEN
//
// End of "$Id: image.cxx 4324 2005-05-09 21:47:22Z rokan $"
//
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