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gl2ps.c
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/*
* GL2PS, an OpenGL to PostScript Printing Library
* Copyright (C) 1999-2017 C. Geuzaine
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of either:
*
* a) 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; or
*
* b) the GL2PS License as published by Christophe Geuzaine, either
* version 2 of the License, or (at your option) any later version.
*
* This program 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 either
* the GNU Library General Public License or the GL2PS License for
* more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library in the file named "COPYING.LGPL";
* if not, write to the Free Software Foundation, Inc., 51 Franklin
* Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* You should have received a copy of the GL2PS License with this
* library in the file named "COPYING.GL2PS"; if not, I will be glad
* to provide one.
*
* For the latest info about gl2ps and a full list of contributors,
* see http://www.geuz.org/gl2ps/.
*
* Please report all bugs and problems to <[email protected]>.
*/
#include "gl2ps.h"
#include <math.h>
#include <string.h>
#include <sys/types.h>
#include <stdarg.h>
#include <time.h>
#include <float.h>
#if defined(GL2PS_HAVE_ZLIB)
#include <zlib.h>
#endif
#if defined(GL2PS_HAVE_LIBPNG)
#include <png.h>
#endif
#if defined(GL2PS_HAVE_LIBEMF)
#include <libEMF/emf.h>
#endif
/*********************************************************************
*
* Private definitions, data structures and prototypes
*
*********************************************************************/
/* Magic numbers (assuming that the order of magnitude of window
coordinates is 10^3) */
#define GL2PS_EPSILON 5.0e-3F
#define GL2PS_ZSCALE 1000.0F
#define GL2PS_ZOFFSET 5.0e-2F
#define GL2PS_ZOFFSET_LARGE 20.0F
#define GL2PS_ZERO(arg) (fabs(arg) < 1.e-20)
/* BSP tree primitive comparison */
#define GL2PS_COINCIDENT 1
#define GL2PS_IN_FRONT_OF 2
#define GL2PS_IN_BACK_OF 3
#define GL2PS_SPANNING 4
/* 2D BSP tree primitive comparison */
#define GL2PS_POINT_COINCIDENT 0
#define GL2PS_POINT_INFRONT 1
#define GL2PS_POINT_BACK 2
/* Internal feedback buffer pass-through tokens */
#define GL2PS_BEGIN_OFFSET_TOKEN 1
#define GL2PS_END_OFFSET_TOKEN 2
#define GL2PS_BEGIN_BOUNDARY_TOKEN 3
#define GL2PS_END_BOUNDARY_TOKEN 4
#define GL2PS_BEGIN_STIPPLE_TOKEN 5
#define GL2PS_END_STIPPLE_TOKEN 6
#define GL2PS_POINT_SIZE_TOKEN 7
#define GL2PS_LINE_CAP_TOKEN 8
#define GL2PS_LINE_JOIN_TOKEN 9
#define GL2PS_LINE_WIDTH_TOKEN 10
#define GL2PS_BEGIN_BLEND_TOKEN 11
#define GL2PS_END_BLEND_TOKEN 12
#define GL2PS_SRC_BLEND_TOKEN 13
#define GL2PS_DST_BLEND_TOKEN 14
#define GL2PS_IMAGEMAP_TOKEN 15
#define GL2PS_DRAW_PIXELS_TOKEN 16
#define GL2PS_TEXT_TOKEN 17
typedef enum {
T_UNDEFINED = -1,
T_CONST_COLOR = 1,
T_VAR_COLOR = 1<<1,
T_ALPHA_1 = 1<<2,
T_ALPHA_LESS_1 = 1<<3,
T_VAR_ALPHA = 1<<4
} GL2PS_TRIANGLE_PROPERTY;
typedef GLfloat GL2PSplane[4];
typedef struct GL2PSbsptree2d_ GL2PSbsptree2d;
struct GL2PSbsptree2d_ {
GL2PSplane plane;
GL2PSbsptree2d *front, *back;
};
typedef struct {
GLint nmax, size, incr, n;
char *array;
} GL2PSlist;
typedef struct GL2PSbsptree_ GL2PSbsptree;
struct GL2PSbsptree_ {
GL2PSplane plane;
GL2PSlist *primitives;
GL2PSbsptree *front, *back;
};
typedef struct {
GL2PSvertex vertex[3];
int prop;
} GL2PStriangle;
typedef struct {
GLshort fontsize;
char *str, *fontname;
/* Note: for a 'special' string, 'alignment' holds the format
(PostScript, PDF, etc.) of the special string */
GLint alignment;
GLfloat angle;
} GL2PSstring;
typedef struct {
GLsizei width, height;
/* Note: for an imagemap, 'type' indicates if it has already been
written to the file or not, and 'format' indicates if it is
visible or not */
GLenum format, type;
GLfloat zoom_x, zoom_y;
GLfloat *pixels;
} GL2PSimage;
typedef struct GL2PSimagemap_ GL2PSimagemap;
struct GL2PSimagemap_ {
GL2PSimage *image;
GL2PSimagemap *next;
};
typedef struct {
GL2PSplane plane;
GLshort type, numverts;
GLushort pattern;
char boundary, offset, culled;
GLint factor, linecap, linejoin, sortid;
GLfloat width, ofactor, ounits;
GL2PSvertex *verts;
union {
GL2PSstring *text;
GL2PSimage *image;
} data;
} GL2PSprimitive;
typedef struct {
#if defined(GL2PS_HAVE_ZLIB)
Bytef *dest, *src, *start;
uLongf destLen, srcLen;
#else
int dummy;
#endif
} GL2PScompress;
typedef struct{
GL2PSlist* ptrlist;
int gsno, fontno, imno, shno, maskshno, trgroupno;
int gsobjno, fontobjno, imobjno, shobjno, maskshobjno, trgroupobjno;
} GL2PSpdfgroup;
typedef struct {
/* General */
GLint format, sort, options, colorsize, colormode, buffersize;
GLint lastlinecap, lastlinejoin;
char *title, *producer, *filename;
GLboolean boundary, blending;
GLfloat *feedback, lastlinewidth;
GLint viewport[4], blendfunc[2], lastfactor;
GL2PSrgba *colormap, lastrgba, threshold, bgcolor;
GLushort lastpattern;
GL2PSvertex lastvertex;
GL2PSlist *primitives, *auxprimitives;
FILE *stream;
GL2PScompress *compress;
GLboolean header;
GL2PSvertex rasterpos;
GLboolean forcerasterpos;
/* BSP-specific */
GLint maxbestroot;
/* Occlusion culling-specific */
GLboolean zerosurfacearea;
GL2PSbsptree2d *imagetree;
GL2PSprimitive *primitivetoadd;
/* PDF-specific */
int streamlength;
GL2PSlist *pdfprimlist, *pdfgrouplist;
int *xreflist;
int objects_stack; /* available objects */
int extgs_stack; /* graphics state object number */
int font_stack; /* font object number */
int im_stack; /* image object number */
int trgroupobjects_stack; /* xobject numbers */
int shader_stack; /* shader object numbers */
int mshader_stack; /* mask shader object numbers */
/* for image map list */
GL2PSimagemap *imagemap_head;
GL2PSimagemap *imagemap_tail;
/* EMF Specific */
#if defined(GL2PS_EMF)
HDC metaDC;
#endif
} GL2PScontext;
typedef struct {
void (*printHeader)(void);
void (*printFooter)(void);
void (*beginViewport)(GLint viewport[4]);
GLint (*endViewport)(void);
void (*printPrimitive)(void *data);
void (*printFinalPrimitive)(void);
const char *file_extension;
const char *description;
} GL2PSbackend;
/* The gl2ps context. gl2ps is not thread safe (we should create a
local GL2PScontext during gl2psBeginPage) */
static GL2PScontext *gl2ps = NULL;
/* Need to forward-declare this one */
static GLint gl2psPrintPrimitives(void);
/*********************************************************************
*
* Utility routines
*
*********************************************************************/
static void gl2psMsg(GLint level, const char *fmt, ...)
{
va_list args;
if(!(gl2ps->options & GL2PS_SILENT)){
switch(level){
case GL2PS_INFO : fprintf(stderr, "GL2PS info: "); break;
case GL2PS_WARNING : fprintf(stderr, "GL2PS warning: "); break;
case GL2PS_ERROR : fprintf(stderr, "GL2PS error: "); break;
}
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fprintf(stderr, "\n");
}
/* if(level == GL2PS_ERROR) exit(1); */
}
static void *gl2psMalloc(size_t size)
{
void *ptr;
if(!size) return NULL;
ptr = malloc(size);
if(!ptr){
gl2psMsg(GL2PS_ERROR, "Couldn't allocate requested memory");
return NULL;
}
return ptr;
}
static void *gl2psRealloc(void *ptr, size_t size)
{
void *orig = ptr;
if(!size) return NULL;
ptr = realloc(orig, size);
if(!ptr){
gl2psMsg(GL2PS_ERROR, "Couldn't reallocate requested memory");
free(orig);
return NULL;
}
return ptr;
}
static void gl2psFree(void *ptr)
{
if(!ptr) return;
free(ptr);
}
static int gl2psWriteBigEndian(unsigned long data, int bytes)
{
int i;
int size = sizeof(unsigned long);
for(i = 1; i <= bytes; ++i){
fputc(0xff & (data >> (size - i) * 8), gl2ps->stream);
}
return bytes;
}
/* zlib compression helper routines */
#if defined(GL2PS_HAVE_ZLIB)
static void gl2psSetupCompress(void)
{
gl2ps->compress = (GL2PScompress*)gl2psMalloc(sizeof(GL2PScompress));
gl2ps->compress->src = NULL;
gl2ps->compress->start = NULL;
gl2ps->compress->dest = NULL;
gl2ps->compress->srcLen = 0;
gl2ps->compress->destLen = 0;
}
static void gl2psFreeCompress(void)
{
if(!gl2ps->compress)
return;
gl2psFree(gl2ps->compress->start);
gl2psFree(gl2ps->compress->dest);
gl2ps->compress->src = NULL;
gl2ps->compress->start = NULL;
gl2ps->compress->dest = NULL;
gl2ps->compress->srcLen = 0;
gl2ps->compress->destLen = 0;
}
static int gl2psAllocCompress(unsigned int srcsize)
{
gl2psFreeCompress();
if(!gl2ps->compress || !srcsize)
return GL2PS_ERROR;
gl2ps->compress->srcLen = srcsize;
gl2ps->compress->destLen = (int)ceil(1.001 * gl2ps->compress->srcLen + 12);
gl2ps->compress->src = (Bytef*)gl2psMalloc(gl2ps->compress->srcLen);
gl2ps->compress->start = gl2ps->compress->src;
gl2ps->compress->dest = (Bytef*)gl2psMalloc(gl2ps->compress->destLen);
return GL2PS_SUCCESS;
}
static void *gl2psReallocCompress(unsigned int srcsize)
{
if(!gl2ps->compress || !srcsize)
return NULL;
if(srcsize < gl2ps->compress->srcLen)
return gl2ps->compress->start;
gl2ps->compress->srcLen = srcsize;
gl2ps->compress->destLen = (int)ceil(1.001 * gl2ps->compress->srcLen + 12);
gl2ps->compress->src = (Bytef*)gl2psRealloc(gl2ps->compress->src,
gl2ps->compress->srcLen);
gl2ps->compress->start = gl2ps->compress->src;
gl2ps->compress->dest = (Bytef*)gl2psRealloc(gl2ps->compress->dest,
gl2ps->compress->destLen);
return gl2ps->compress->start;
}
static int gl2psWriteBigEndianCompress(unsigned long data, int bytes)
{
int i;
int size = sizeof(unsigned long);
for(i = 1; i <= bytes; ++i){
*gl2ps->compress->src = (Bytef)(0xff & (data >> (size-i) * 8));
++gl2ps->compress->src;
}
return bytes;
}
static int gl2psDeflate(void)
{
/* For compatibility with older zlib versions, we use compress(...)
instead of compress2(..., Z_BEST_COMPRESSION) */
return compress(gl2ps->compress->dest, &gl2ps->compress->destLen,
gl2ps->compress->start, gl2ps->compress->srcLen);
}
#endif
static int gl2psPrintf(const char* fmt, ...)
{
int ret;
va_list args;
#if defined(GL2PS_HAVE_ZLIB)
static char buf[1024];
char *bufptr = buf;
GLboolean freebuf = GL_FALSE;
unsigned int oldsize = 0;
#if !defined(GL2PS_HAVE_NO_VSNPRINTF)
/* Try writing the string to a 1024 byte buffer. If it is too small to fit,
keep trying larger sizes until it does. */
int bufsize = sizeof(buf);
#endif
if(gl2ps->options & GL2PS_COMPRESS){
va_start(args, fmt);
#if defined(GL2PS_HAVE_NO_VSNPRINTF)
ret = vsprintf(buf, fmt, args);
#else
ret = vsnprintf(bufptr, bufsize, fmt, args);
#endif
va_end(args);
#if !defined(GL2PS_HAVE_NO_VSNPRINTF)
while(ret >= (bufsize - 1) || ret < 0){
/* Too big. Allocate a new buffer. */
bufsize *= 2;
if(freebuf == GL_TRUE) gl2psFree(bufptr);
bufptr = (char *)gl2psMalloc(bufsize);
freebuf = GL_TRUE;
va_start(args, fmt);
ret = vsnprintf(bufptr, bufsize, fmt, args);
va_end(args);
}
#endif
oldsize = gl2ps->compress->srcLen;
gl2ps->compress->start = (Bytef*)gl2psReallocCompress(oldsize + ret);
memcpy(gl2ps->compress->start + oldsize, bufptr, ret);
if(freebuf == GL_TRUE) gl2psFree(bufptr);
ret = 0;
}
else{
#endif
va_start(args, fmt);
ret = vfprintf(gl2ps->stream, fmt, args);
va_end(args);
#if defined(GL2PS_HAVE_ZLIB)
}
#endif
return ret;
}
static void gl2psPrintGzipHeader(void)
{
#if defined(GL2PS_HAVE_ZLIB)
char tmp[10] = {'\x1f', '\x8b', /* magic numbers: 0x1f, 0x8b */
8, /* compression method: Z_DEFLATED */
0, /* flags */
0, 0, 0, 0, /* time */
2, /* extra flags: max compression */
'\x03'}; /* OS code: 0x03 (Unix) */
if(gl2ps->options & GL2PS_COMPRESS){
gl2psSetupCompress();
/* add the gzip file header */
fwrite(tmp, 10, 1, gl2ps->stream);
}
#endif
}
static void gl2psPrintGzipFooter(void)
{
#if defined(GL2PS_HAVE_ZLIB)
int n;
uLong crc, len;
char tmp[8];
if(gl2ps->options & GL2PS_COMPRESS){
if(Z_OK != gl2psDeflate()){
gl2psMsg(GL2PS_ERROR, "Zlib deflate error");
}
else{
/* determine the length of the header in the zlib stream */
n = 2; /* CMF+FLG */
if(gl2ps->compress->dest[1] & (1<<5)){
n += 4; /* DICTID */
}
/* write the data, without the zlib header and footer */
fwrite(gl2ps->compress->dest+n, gl2ps->compress->destLen-(n+4),
1, gl2ps->stream);
/* add the gzip file footer */
crc = crc32(0L, gl2ps->compress->start, gl2ps->compress->srcLen);
for(n = 0; n < 4; ++n){
tmp[n] = (char)(crc & 0xff);
crc >>= 8;
}
len = gl2ps->compress->srcLen;
for(n = 4; n < 8; ++n){
tmp[n] = (char)(len & 0xff);
len >>= 8;
}
fwrite(tmp, 8, 1, gl2ps->stream);
}
gl2psFreeCompress();
gl2psFree(gl2ps->compress);
gl2ps->compress = NULL;
}
#endif
}
/* The list handling routines */
static void gl2psListRealloc(GL2PSlist *list, GLint n)
{
if(!list){
gl2psMsg(GL2PS_ERROR, "Cannot reallocate NULL list");
return;
}
if(n <= 0) return;
if(!list->array){
list->nmax = n;
list->array = (char*)gl2psMalloc(list->nmax * list->size);
}
else{
if(n > list->nmax){
list->nmax = ((n - 1) / list->incr + 1) * list->incr;
list->array = (char*)gl2psRealloc(list->array,
list->nmax * list->size);
}
}
}
static GL2PSlist *gl2psListCreate(GLint n, GLint incr, GLint size)
{
GL2PSlist *list;
if(n < 0) n = 0;
if(incr <= 0) incr = 1;
list = (GL2PSlist*)gl2psMalloc(sizeof(GL2PSlist));
list->nmax = 0;
list->incr = incr;
list->size = size;
list->n = 0;
list->array = NULL;
gl2psListRealloc(list, n);
return list;
}
static void gl2psListReset(GL2PSlist *list)
{
if(!list) return;
list->n = 0;
}
static void gl2psListDelete(GL2PSlist *list)
{
if(!list) return;
gl2psFree(list->array);
gl2psFree(list);
}
static void gl2psListAdd(GL2PSlist *list, void *data)
{
if(!list){
gl2psMsg(GL2PS_ERROR, "Cannot add into unallocated list");
return;
}
list->n++;
gl2psListRealloc(list, list->n);
memcpy(&list->array[(list->n - 1) * list->size], data, list->size);
}
static int gl2psListNbr(GL2PSlist *list)
{
if(!list)
return 0;
return list->n;
}
static void *gl2psListPointer(GL2PSlist *list, GLint idx)
{
if(!list){
gl2psMsg(GL2PS_ERROR, "Cannot point into unallocated list");
return NULL;
}
if((idx < 0) || (idx >= list->n)){
gl2psMsg(GL2PS_ERROR, "Wrong list index in gl2psListPointer");
return NULL;
}
return &list->array[idx * list->size];
}
static void gl2psListSort(GL2PSlist *list,
int (*fcmp)(const void *a, const void *b))
{
if(!list)
return;
qsort(list->array, list->n, list->size, fcmp);
}
/* Must be a list of GL2PSprimitives. */
static void gl2psListAssignSortIds(GL2PSlist *list)
{
GLint i;
for(i = 0; i < gl2psListNbr(list); i++){
(*(GL2PSprimitive**)gl2psListPointer(list, i))->sortid = i;
}
}
static void gl2psListAction(GL2PSlist *list, void (*action)(void *data))
{
GLint i;
for(i = 0; i < gl2psListNbr(list); i++){
(*action)(gl2psListPointer(list, i));
}
}
static void gl2psListActionInverse(GL2PSlist *list, void (*action)(void *data))
{
GLint i;
for(i = gl2psListNbr(list); i > 0; i--){
(*action)(gl2psListPointer(list, i-1));
}
}
#if defined(GL2PS_HAVE_LIBPNG)
static void gl2psListRead(GL2PSlist *list, int index, void *data)
{
if((index < 0) || (index >= list->n))
gl2psMsg(GL2PS_ERROR, "Wrong list index in gl2psListRead");
memcpy(data, &list->array[index * list->size], list->size);
}
static void gl2psEncodeBase64Block(unsigned char in[3], unsigned char out[4], int len)
{
static const char cb64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
out[0] = cb64[ in[0] >> 2 ];
out[1] = cb64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4) ];
out[2] = (len > 1) ? cb64[ ((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6) ] : '=';
out[3] = (len > 2) ? cb64[ in[2] & 0x3f ] : '=';
}
static void gl2psListEncodeBase64(GL2PSlist *list)
{
unsigned char *buffer, in[3], out[4];
int i, n, index, len;
n = list->n * list->size;
buffer = (unsigned char*)gl2psMalloc(n * sizeof(unsigned char));
memcpy(buffer, list->array, n * sizeof(unsigned char));
gl2psListReset(list);
index = 0;
while(index < n) {
len = 0;
for(i = 0; i < 3; i++) {
if(index < n){
in[i] = buffer[index];
len++;
}
else{
in[i] = 0;
}
index++;
}
if(len) {
gl2psEncodeBase64Block(in, out, len);
for(i = 0; i < 4; i++)
gl2psListAdd(list, &out[i]);
}
}
gl2psFree(buffer);
}
#endif
/* Helpers for rgba colors */
static GLboolean gl2psSameColor(GL2PSrgba rgba1, GL2PSrgba rgba2)
{
if(!GL2PS_ZERO(rgba1[0] - rgba2[0]) ||
!GL2PS_ZERO(rgba1[1] - rgba2[1]) ||
!GL2PS_ZERO(rgba1[2] - rgba2[2]))
return GL_FALSE;
return GL_TRUE;
}
static GLboolean gl2psVertsSameColor(const GL2PSprimitive *prim)
{
int i;
for(i = 1; i < prim->numverts; i++){
if(!gl2psSameColor(prim->verts[0].rgba, prim->verts[i].rgba)){
return GL_FALSE;
}
}
return GL_TRUE;
}
static GLboolean gl2psSameColorThreshold(int n, GL2PSrgba rgba[],
GL2PSrgba threshold)
{
int i;
if(n < 2) return GL_TRUE;
for(i = 1; i < n; i++){
if(fabs(rgba[0][0] - rgba[i][0]) > threshold[0] ||
fabs(rgba[0][1] - rgba[i][1]) > threshold[1] ||
fabs(rgba[0][2] - rgba[i][2]) > threshold[2])
return GL_FALSE;
}
return GL_TRUE;
}
static void gl2psSetLastColor(GL2PSrgba rgba)
{
int i;
for(i = 0; i < 3; ++i){
gl2ps->lastrgba[i] = rgba[i];
}
}
static GLfloat gl2psGetRGB(GL2PSimage *im, GLuint x, GLuint y,
GLfloat *red, GLfloat *green, GLfloat *blue)
{
GLsizei width = im->width;
GLsizei height = im->height;
GLfloat *pixels = im->pixels;
GLfloat *pimag;
/* OpenGL image is from down to up, PS image is up to down */
switch(im->format){
case GL_RGBA:
pimag = pixels + 4 * (width * (height - 1 - y) + x);
break;
case GL_RGB:
default:
pimag = pixels + 3 * (width * (height - 1 - y) + x);
break;
}
*red = *pimag; pimag++;
*green = *pimag; pimag++;
*blue = *pimag; pimag++;
return (im->format == GL_RGBA) ? *pimag : 1.0F;
}
/* Helper routines for pixmaps */
static GL2PSimage *gl2psCopyPixmap(GL2PSimage *im)
{
int size;
GL2PSimage *image = (GL2PSimage*)gl2psMalloc(sizeof(GL2PSimage));
image->width = im->width;
image->height = im->height;
image->format = im->format;
image->type = im->type;
image->zoom_x = im->zoom_x;
image->zoom_y = im->zoom_y;
switch(image->format){
case GL_RGBA:
size = image->height * image->width * 4 * sizeof(GLfloat);
break;
case GL_RGB:
default:
size = image->height * image->width * 3 * sizeof(GLfloat);
break;
}
image->pixels = (GLfloat*)gl2psMalloc(size);
memcpy(image->pixels, im->pixels, size);
return image;
}
static void gl2psFreePixmap(GL2PSimage *im)
{
if(!im)
return;
gl2psFree(im->pixels);
gl2psFree(im);
}
#if defined(GL2PS_HAVE_LIBPNG)
#if !defined(png_jmpbuf)
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
static void gl2psUserWritePNG(png_structp png_ptr, png_bytep data, png_size_t length)
{
unsigned int i;
GL2PSlist *png = (GL2PSlist*)png_get_io_ptr(png_ptr);
for(i = 0; i < length; i++)
gl2psListAdd(png, &data[i]);
}
static void gl2psUserFlushPNG(png_structp png_ptr)
{
(void) png_ptr; /* not used */
}
static void gl2psConvertPixmapToPNG(GL2PSimage *pixmap, GL2PSlist *png)
{
png_structp png_ptr;
png_infop info_ptr;
unsigned char *row_data;
GLfloat dr, dg, db;
int row, col;
if(!(png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL)))
return;
if(!(info_ptr = png_create_info_struct(png_ptr))){
png_destroy_write_struct(&png_ptr, NULL);
return;
}
if(setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_set_write_fn(png_ptr, (void *)png, gl2psUserWritePNG, gl2psUserFlushPNG);
png_set_compression_level(png_ptr, Z_DEFAULT_COMPRESSION);
png_set_IHDR(png_ptr, info_ptr, pixmap->width, pixmap->height, 8,
PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
png_write_info(png_ptr, info_ptr);
row_data = (unsigned char*)gl2psMalloc(3 * pixmap->width * sizeof(unsigned char));
for(row = 0; row < pixmap->height; row++){
for(col = 0; col < pixmap->width; col++){
gl2psGetRGB(pixmap, col, row, &dr, &dg, &db);
row_data[3*col] = (unsigned char)(255. * dr);
row_data[3*col+1] = (unsigned char)(255. * dg);
row_data[3*col+2] = (unsigned char)(255. * db);
}
png_write_row(png_ptr, (png_bytep)row_data);
}
gl2psFree(row_data);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
}
#endif
/* Helper routines for text strings */
static GL2PSprimitive *gl2psCreatePrimitive();
static void gl2psGetPlane(GL2PSprimitive *prim, GL2PSplane plane);
static GLint gl2psAddText(GLint type, const char *str, const char *fontname,
GLshort fontsize, GLint alignment, GLfloat angle,
GL2PSrgba color, GLboolean setblpos,
GLfloat blx, GLfloat bly)
{
GLfloat pos[4];
GL2PSprimitive *prim;
GLboolean valid;
GL2PSplane plane;
if(!gl2ps || !str || !fontname) return GL2PS_UNINITIALIZED;
if(gl2ps->options & GL2PS_NO_TEXT) return GL2PS_SUCCESS;
if (gl2ps->forcerasterpos) {
pos[0] = gl2ps->rasterpos.xyz[0];
pos[1] = gl2ps->rasterpos.xyz[1];
pos[2] = gl2ps->rasterpos.xyz[2];
pos[3] = 1.f;
}
else {
glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID, &valid);
if(GL_FALSE == valid) return GL2PS_SUCCESS; /* the primitive is culled */
glGetFloatv(GL_CURRENT_RASTER_POSITION, pos);
}
prim = gl2psCreatePrimitive();
prim->type = (GLshort)type;
prim->boundary = 0;
prim->numverts = setblpos ? 2 : 1;
prim->verts = (GL2PSvertex*)gl2psMalloc(sizeof(GL2PSvertex) * prim->numverts);
prim->verts[0].xyz[0] = pos[0];
prim->verts[0].xyz[1] = pos[1];
prim->verts[0].xyz[2] = pos[2];
if (setblpos) {
prim->verts[1].xyz[0] = blx;
prim->verts[1].xyz[1] = bly;
prim->verts[1].xyz[2] = 0;
}
prim->culled = 0;
prim->offset = 0;
prim->ofactor = 0.0;
prim->ounits = 0.0;
prim->pattern = 0;
prim->factor = 0;
prim->width = 1;
prim->linecap = 0;
prim->linejoin = 0;
if (color) {
memcpy(prim->verts[0].rgba, color, 4 * sizeof(float));
}
else {
if (gl2ps->forcerasterpos) {
prim->verts[0].rgba[0] = gl2ps->rasterpos.rgba[0];
prim->verts[0].rgba[1] = gl2ps->rasterpos.rgba[1];
prim->verts[0].rgba[2] = gl2ps->rasterpos.rgba[2];
prim->verts[0].rgba[3] = gl2ps->rasterpos.rgba[3];
}
else {
glGetFloatv(GL_CURRENT_RASTER_COLOR, prim->verts[0].rgba);
}
}
prim->data.text = (GL2PSstring*)gl2psMalloc(sizeof(GL2PSstring));
prim->data.text->str = (char*)gl2psMalloc((strlen(str)+1)*sizeof(char));
strcpy(prim->data.text->str, str);
prim->data.text->fontname = (char*)gl2psMalloc((strlen(fontname)+1)*sizeof(char));
strcpy(prim->data.text->fontname, fontname);
prim->data.text->fontsize = fontsize;
prim->data.text->alignment = alignment;
prim->data.text->angle = angle;
gl2psGetPlane(prim, plane);
gl2ps->forcerasterpos = GL_FALSE;
/* If no OpenGL context, just add directly to primitives */
if (gl2ps->options & GL2PS_NO_OPENGL_CONTEXT) {
gl2psListAdd(gl2ps->primitives, &prim);
}
else {
gl2psListAdd(gl2ps->auxprimitives, &prim);
glPassThrough(GL2PS_TEXT_TOKEN);
}
return GL2PS_SUCCESS;
}
static GL2PSstring *gl2psCopyText(GL2PSstring *t)
{
GL2PSstring *text = (GL2PSstring*)gl2psMalloc(sizeof(GL2PSstring));
text->str = (char*)gl2psMalloc((strlen(t->str)+1)*sizeof(char));
strcpy(text->str, t->str);
text->fontname = (char*)gl2psMalloc((strlen(t->fontname)+1)*sizeof(char));
strcpy(text->fontname, t->fontname);
text->fontsize = t->fontsize;
text->alignment = t->alignment;
text->angle = t->angle;
return text;
}
static void gl2psFreeText(GL2PSstring *text)
{
if(!text)
return;
gl2psFree(text->str);
gl2psFree(text->fontname);
gl2psFree(text);
}
/* Helpers for blending modes */
static GLboolean gl2psSupportedBlendMode(GLenum sfactor, GLenum dfactor)
{
/* returns TRUE if gl2ps supports the argument combination: only two
blending modes have been implemented so far */
if( (sfactor == GL_SRC_ALPHA && dfactor == GL_ONE_MINUS_SRC_ALPHA) ||
(sfactor == GL_ONE && dfactor == GL_ZERO) )
return GL_TRUE;
return GL_FALSE;
}
static void gl2psAdaptVertexForBlending(GL2PSvertex *v)