svn-gvsig-desktop / branches / gvSIG_19_ext3D_osgVP_2_2_0 / libraries / libjni-potrace / src / main / native / jpotrace / backend_pdf.c @ 31855
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1 | 31791 | rgaitan | /* Copyright (C) 2001-2007 Peter Selinger.
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2 | This file is part of Potrace. It is free software and it is covered
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3 | by the GNU General Public License. See the file COPYING for details. */
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4 | |||
5 | /* $Id: backend_pdf.c 147 2007-04-09 00:44:09Z selinger $ */
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6 | |||
7 | /* The PDF backend of Potrace. Stream compression is optionally
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8 | supplied via the functions in flate.c. */
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9 | |||
10 | #include <stdio.h> |
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11 | #include <stdarg.h> |
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12 | #include <string.h> |
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13 | #include <math.h> |
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14 | #include <stdlib.h> |
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15 | |||
16 | #include "main.h" |
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17 | #include "backend_pdf.h" |
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18 | #include "flate.h" |
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19 | #include "lists.h" |
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20 | #include "potracelib.h" |
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21 | #include "auxiliary.h" |
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22 | |||
23 | #ifdef HAVE_CONFIG_H
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24 | #include "config.h" |
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25 | #endif
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26 | |||
27 | #ifndef M_PI
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28 | #define M_PI 3.14159265358979323846 |
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29 | #endif
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30 | |||
31 | |||
32 | typedef int color_t; |
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33 | |||
34 | #define black 0x000000 |
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35 | #define red 0xff0000 |
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36 | #define green 0x008000 |
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37 | #define blue 0x0000ff |
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38 | |||
39 | /* ---------------------------------------------------------------------- */
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40 | /* auxiliary: growing arrays */
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41 | |||
42 | struct intarray_s {
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43 | int size;
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44 | int *data;
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45 | }; |
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46 | typedef struct intarray_s intarray_t; |
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47 | |||
48 | static inline void intarray_init(intarray_t *ar) { |
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49 | ar->size = 0;
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50 | ar->data = NULL;
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51 | } |
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52 | |||
53 | static inline void intarray_term(intarray_t *ar) { |
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54 | free(ar->data); |
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55 | ar->size = 0;
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56 | ar->data = NULL;
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57 | } |
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58 | |||
59 | /* Set ar[n]=val. Expects n>=0. Grows array if necessary. Return 0 on
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60 | success and -1 on error with errno set. */
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61 | static inline int intarray_set(intarray_t *ar, int n, int val) { |
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62 | int *p;
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63 | int s;
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64 | |||
65 | if (n >= ar->size) {
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66 | s = n+1024;
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67 | p = (int *)realloc(ar->data, s * sizeof(int)); |
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68 | if (!p) {
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69 | return -1; |
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70 | } |
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71 | ar->data = p; |
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72 | ar->size = s; |
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73 | } |
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74 | ar->data[n] = val; |
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75 | return 0; |
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76 | } |
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77 | |||
78 | /* ---------------------------------------------------------------------- */
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79 | /* some global variables */
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80 | |||
81 | static intarray_t xref;
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82 | static int nxref = 0; |
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83 | static intarray_t pages;
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84 | static int npages; |
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85 | static int streamofs; |
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86 | static size_t outcount; /* output file position */ |
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87 | |||
88 | /* ---------------------------------------------------------------------- */
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89 | /* functions for interfacing with compression backend */
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90 | |||
91 | /* xship: callback function that must be initialized before calling
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92 | any other functions of the "ship" family. xship_file must be
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93 | initialized too. */
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94 | |||
95 | /* print the token to f, but filtered through a compression
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96 | filter in case filter!=0 */
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97 | static int (*xship)(FILE *f, int filter, char *s, int len); |
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98 | static FILE *xship_file;
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99 | |||
100 | /* ship PDF code, filtered */
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101 | static int ship(const char *fmt, ...) { |
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102 | va_list args; |
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103 | static char buf[4096]; /* static string limit is okay here because |
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104 | we only use constant format strings - for
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105 | the same reason, it is okay to use
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106 | vsprintf instead of vsnprintf below. */
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107 | va_start(args, fmt); |
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108 | vsprintf(buf, fmt, args); |
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109 | buf[4095] = 0; |
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110 | va_end(args); |
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111 | |||
112 | outcount += xship(xship_file, 1, buf, strlen(buf));
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113 | return 0; |
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114 | } |
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115 | |||
116 | /* ship PDF code, unfiltered */
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117 | static int shipclear(char *fmt, ...) { |
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118 | static char buf[4096]; |
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119 | va_list args; |
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120 | |||
121 | va_start(args, fmt); |
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122 | vsprintf(buf, fmt, args); |
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123 | buf[4095] = 0; |
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124 | va_end(args); |
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125 | |||
126 | outcount += xship(xship_file, 0, buf, strlen(buf));
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127 | return 0; |
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128 | } |
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129 | |||
130 | /* set all callback functions */
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131 | static void pdf_callbacks(FILE *fout) { |
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132 | |||
133 | if (info.compress) {
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134 | xship = pdf_xship; |
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135 | } else {
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136 | xship = dummy_xship; |
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137 | } |
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138 | xship_file = fout; |
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139 | } |
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140 | |||
141 | /* ---------------------------------------------------------------------- */
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142 | /* PDF path-drawing auxiliary functions */
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143 | |||
144 | /* coordinate quantization */
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145 | static inline point_t unit(dpoint_t p) { |
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146 | point_t q; |
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147 | |||
148 | q.x = (long)(floor(p.x*info.unit+.5)); |
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149 | q.y = (long)(floor(p.y*info.unit+.5)); |
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150 | return q;
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151 | } |
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152 | |||
153 | static void pdf_coords(dpoint_t p) { |
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154 | point_t cur = unit(p); |
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155 | ship("%ld %ld ", cur.x, cur.y);
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156 | } |
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157 | |||
158 | static void pdf_moveto(dpoint_t p) { |
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159 | pdf_coords(p); |
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160 | ship("m\n");
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161 | } |
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162 | |||
163 | static void pdf_lineto(dpoint_t p) { |
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164 | pdf_coords(p); |
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165 | ship("l\n");
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166 | } |
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167 | |||
168 | static void pdf_curveto(dpoint_t p1, dpoint_t p2, dpoint_t p3) { |
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169 | point_t q1, q2, q3; |
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170 | |||
171 | q1 = unit(p1); |
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172 | q2 = unit(p2); |
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173 | q3 = unit(p3); |
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174 | |||
175 | ship("%ld %ld %ld %ld %ld %ld c\n", q1.x, q1.y, q2.x, q2.y, q3.x, q3.y);
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176 | } |
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177 | |||
178 | /* this procedure returns a statically allocated string */
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179 | static char *pdf_colorstring(const color_t col) { |
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180 | double r, g, b;
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181 | static char buf[100]; |
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182 | |||
183 | r = (col & 0xff0000) >> 16; |
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184 | g = (col & 0x00ff00) >> 8; |
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185 | b = (col & 0x0000ff) >> 0; |
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186 | |||
187 | if (r==0 && g==0 && b==0) { |
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188 | return "0 g"; |
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189 | } else if (r==255 && g==255 && b==255) { |
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190 | return "1 g"; |
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191 | } else if (r == g && g == b) { |
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192 | sprintf(buf, "%.3f g", r/255.0); |
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193 | return buf;
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194 | } else {
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195 | sprintf(buf, "%.3f %.3f %.3f rg", r/255.0, g/255.0, b/255.0); |
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196 | return buf;
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197 | } |
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198 | } |
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199 | |||
200 | static color_t pdf_color = -1; |
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201 | static double pdf_width = -1; |
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202 | |||
203 | static void pdf_setcolor(const color_t col) { |
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204 | if (col == pdf_color) {
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205 | return;
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206 | } |
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207 | pdf_color = col; |
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208 | |||
209 | ship("%s\n", pdf_colorstring(col));
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210 | } |
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211 | |||
212 | /* explicit encoding, does not use special macros */
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213 | static int pdf_path(potrace_curve_t *curve) { |
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214 | int i;
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215 | dpoint_t *c; |
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216 | int m = curve->n;
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217 | |||
218 | c = curve->c[m-1];
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219 | pdf_moveto(c[2]);
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220 | |||
221 | for (i=0; i<m; i++) { |
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222 | c = curve->c[i]; |
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223 | switch (curve->tag[i]) {
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224 | case POTRACE_CORNER:
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225 | pdf_lineto(c[1]);
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226 | pdf_lineto(c[2]);
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227 | break;
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228 | case POTRACE_CURVETO:
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229 | pdf_curveto(c[0], c[1], c[2]); |
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230 | break;
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231 | } |
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232 | } |
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233 | return 0; |
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234 | } |
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235 | |||
236 | /* ---------------------------------------------------------------------- */
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237 | /* Backends for various types of output. */
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238 | |||
239 | /* Normal output: black on transparent */
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240 | static int render0(potrace_path_t *plist) { |
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241 | potrace_path_t *p; |
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242 | |||
243 | pdf_setcolor(info.color); |
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244 | list_forall (p, plist) { |
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245 | pdf_path(&p->curve); |
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246 | ship("h\n");
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247 | if (p->next == NULL || p->next->sign == '+') { |
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248 | ship("f\n");
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249 | } |
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250 | } |
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251 | return 0; |
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252 | } |
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253 | |||
254 | /* Opaque output: alternating black and white */
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255 | static int render0_opaque(potrace_path_t *plist) { |
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256 | potrace_path_t *p; |
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257 | |||
258 | list_forall (p, plist) { |
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259 | pdf_path(&p->curve); |
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260 | ship("h\n");
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261 | pdf_setcolor(p->sign=='+' ? info.color : info.fillcolor);
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262 | ship("f\n");
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263 | } |
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264 | return 0; |
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265 | } |
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266 | |||
267 | /* select the appropriate rendering function from above */
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268 | static int pdf_render(potrace_path_t *plist) |
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269 | { |
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270 | if (info.opaque) {
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271 | return render0_opaque(plist);
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272 | } |
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273 | return render0(plist);
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274 | } |
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275 | |||
276 | /* ---------------------------------------------------------------------- */
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277 | /* PDF header and footer */
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278 | |||
279 | int init_pdf(FILE *fout)
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280 | { |
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281 | intarray_init(&xref); |
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282 | intarray_init(&pages); |
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283 | nxref = 0;
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284 | npages = 0;
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285 | |||
286 | /* set callback functions for shipping routines */
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287 | pdf_callbacks(fout); |
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288 | outcount = 0;
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289 | |||
290 | shipclear("%%PDF-1.3\n");
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291 | |||
292 | intarray_set(&xref, nxref++, outcount); |
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293 | shipclear("1 0 obj\n<</Type/Catalog/Pages 3 0 R>>\nendobj\n");
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294 | |||
295 | intarray_set(&xref, nxref++, outcount); |
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296 | shipclear("2 0 obj\n"
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297 | "<</Creator"
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298 | "("POTRACE" "VERSION", written by Peter Selinger 2001-2007)>>\n" |
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299 | "endobj\n");
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300 | |||
301 | /* delay obj #3 (pages) until end */
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302 | nxref++; |
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303 | |||
304 | fflush(fout); |
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305 | return 0; |
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306 | } |
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307 | |||
308 | int term_pdf(FILE *fout)
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309 | { |
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310 | int startxref;
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311 | int i;
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312 | |||
313 | pdf_callbacks(fout); |
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314 | |||
315 | intarray_set(&xref, 2, outcount);
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316 | shipclear("3 0 obj\n"
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317 | "<</Type/Pages/Count %d/Kids[\n", npages);
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318 | for (i = 0; i < npages; i++) |
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319 | shipclear("%d 0 R\n", pages.data[i]);
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320 | shipclear("]>>\nendobj\n");
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321 | |||
322 | startxref = outcount; |
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323 | |||
324 | shipclear("xref\n0 %d\n", nxref + 1); |
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325 | shipclear("0000000000 65535 f \n");
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326 | for (i = 0; i < nxref; i++) |
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327 | shipclear("%0.10d 00000 n \n", xref.data[i]);
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328 | |||
329 | shipclear("trailer\n<</Size %d/Root 1 0 R/Info 2 0 R>>\n", nxref + 1); |
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330 | shipclear("startxref\n%d\n%%%%EOF\n", startxref);
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331 | |||
332 | fflush(fout); |
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333 | intarray_term(&xref); |
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334 | intarray_term(&pages); |
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335 | return 0; |
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336 | } |
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337 | |||
338 | static void pdf_pageinit(imginfo_t *imginfo) |
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339 | { |
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340 | double s, c;
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341 | |||
342 | double origx = imginfo->trans.orig[0] + imginfo->lmar; |
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343 | double origy = imginfo->trans.orig[1] + imginfo->bmar; |
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344 | double scalex = imginfo->width / imginfo->pixwidth / info.unit;
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345 | double scaley = imginfo->height / imginfo->pixheight / info.unit;
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346 | int pagew = (int)ceil(imginfo->trans.bb[0]+imginfo->lmar+imginfo->rmar); |
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347 | int pageh = (int)ceil(imginfo->trans.bb[1]+imginfo->tmar+imginfo->bmar); |
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348 | |||
349 | pdf_color = -1;
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350 | pdf_width = -1;
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351 | |||
352 | intarray_set(&xref, nxref++, outcount); |
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353 | shipclear("%d 0 obj\n", nxref);
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354 | shipclear("<</Type/Page/Parent 3 0 R/Resources<</ProcSet[/PDF]>>");
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355 | shipclear("/MediaBox[0 0 %d %d]", pagew, pageh);
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356 | shipclear("/Contents %d 0 R>>\n", nxref + 1); |
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357 | shipclear("endobj\n");
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358 | |||
359 | intarray_set(&pages, npages++, nxref); |
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360 | |||
361 | intarray_set(&xref, nxref++, outcount); |
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362 | shipclear("%d 0 obj\n", nxref);
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363 | if (info.compress)
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364 | shipclear("<</Filter/FlateDecode/Length %d 0 R>>\n", nxref + 1); |
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365 | else
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366 | shipclear("<</Length %d 0 R>>\n", nxref + 1); |
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367 | shipclear("stream\n");
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368 | |||
369 | streamofs = outcount; |
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370 | |||
371 | s = sin(info.angle * M_PI / 180.0); |
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372 | c = cos(info.angle * M_PI / 180.0); |
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373 | |||
374 | ship("%f %f %f %f %.0f %.0f cm\n", scalex*c, scalex*s, -scaley*s, scaley*c, origx, origy);
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375 | } |
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376 | |||
377 | static void pdf_pageterm(void) |
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378 | { |
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379 | int streamlen;
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380 | |||
381 | shipclear("");
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382 | |||
383 | streamlen = outcount - streamofs; |
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384 | shipclear("endstream\nendobj\n");
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385 | |||
386 | intarray_set(&xref, nxref++, outcount); |
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387 | shipclear("%d 0 obj\n%d\nendobj\n", nxref, streamlen);
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388 | } |
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389 | |||
390 | int page_pdf(FILE *fout, potrace_path_t *plist, imginfo_t *imginfo)
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391 | { |
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392 | int r;
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393 | |||
394 | pdf_callbacks(fout); |
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395 | |||
396 | pdf_pageinit(imginfo); |
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397 | |||
398 | r = pdf_render(plist); |
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399 | if (r) {
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400 | return r;
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401 | } |
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402 | |||
403 | pdf_pageterm(); |
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404 | |||
405 | fflush(fout); |
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406 | |||
407 | return 0; |
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408 | } |