1 #if !defined(_PETSCIMAGE_H) 2 #define _PETSCIMAGE_H 3 4 #include <petscdraw.h> 5 6 typedef struct _n_PetscImage *PetscImage; 7 typedef struct _n_PetscImage { 8 unsigned char *buffer; /* raster buffer */ 9 int w,h; /* width, height */ 10 int clip[4]; /* clip ranges */ 11 unsigned char palette[256][3]; /* colormap */ 12 } _n_PetscImage; 13 14 PETSC_STATIC_INLINE void PetscImageSetClip(PetscImage img,int x,int y,int w,int h) 15 { 16 img->clip[0] = PetscClipInterval(x,0,img->w-1); /* xmin */ 17 img->clip[1] = PetscClipInterval(y,0,img->h-1); /* ymin */ 18 img->clip[2] = PetscClipInterval(x+w,0,img->w); /* xmax+1 */ 19 img->clip[3] = PetscClipInterval(y+h,0,img->h); /* ymax+1 */ 20 } 21 22 PETSC_STATIC_INLINE void PetscImageClear(PetscImage img) 23 { 24 int x, xs = img->clip[0], xe = img->clip[2]; 25 int y, ys = img->clip[1], ye = img->clip[3]; 26 for (y = ys; y < ye; y++) 27 for (x = xs; x < xe; x++) 28 img->buffer[y * img->w + x] = 0; 29 } 30 31 PETSC_STATIC_INLINE void PetscImageDrawPixel(PetscImage img,int x,int y,int c) 32 { 33 if (x < img->clip[0] || x >= img->clip[2]) return; 34 if (y < img->clip[1] || y >= img->clip[3]) return; 35 img->buffer[y * img->w + x] = (unsigned char)c; 36 } 37 38 PETSC_STATIC_INLINE void PetscImageDrawLine(PetscImage img,int x_1,int y_1,int x_2,int y_2,int c) 39 { 40 if (y_1 == y_2) { 41 /* Horizontal line */ 42 if (x_2 - x_1 < 0) {int tmp = x_1; x_1 = x_2; x_2 = tmp;} 43 while (x_1 <= x_2) PetscImageDrawPixel(img,x_1++,y_1,c); 44 } else if (x_1 == x_2) { 45 /* Vertical line */ 46 if (y_2 - y_1 < 0) {int tmp = y_1; y_1 = y_2; y_2 = tmp;} 47 while (y_1 <= y_2) PetscImageDrawPixel(img,x_1,y_1++,c); 48 } else { 49 /* Bresenham's line drawing algorithm */ 50 int dx = PetscAbs(x_2 - x_1), sx = (x_2 - x_1) >= 0 ? +1 : -1; 51 int dy = PetscAbs(y_2 - y_1), sy = (y_2 - y_1) >= 0 ? +1 : -1; 52 int error = (dx > dy ? dx : -dy)/2, err; 53 while (1) { 54 PetscImageDrawPixel(img,x_1,y_1,c); 55 if (x_1 == x_2 && y_1 == y_2) break; 56 err = error; 57 if (err > -dx) { error -= dy; x_1 += sx; } 58 if (err < +dy) { error += dx; y_1 += sy; } 59 } 60 } 61 } 62 63 PETSC_STATIC_INLINE void PetscImageDrawRectangle(PetscImage img,int x,int y,int w,int h,int c) 64 { 65 66 int xs = PetscMax(x,img->clip[0]), xe = PetscMin(x+w,img->clip[2]); 67 int ys = PetscMax(y,img->clip[1]), ye = PetscMin(y+h,img->clip[3]); 68 if (xs >= xe || ys >= ye) return; 69 for (y = ys; y < ye; y++) 70 for (x = xs; x < xe; x++) 71 img->buffer[y * img->w + x] = (unsigned char)c; 72 } 73 74 PETSC_STATIC_INLINE void PetscImageDrawEllipse(PetscImage img,int xc,int yc,int w,int h,int c) 75 { 76 /* Bresenham's circle/ellipse drawing algorithm */ 77 int x, y, s, a2 = w*w, b2 = h*h; 78 for (x = 0, y = h, s = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) { 79 PetscImageDrawLine(img,xc + x,yc + y,xc - x,yc + y,c); 80 PetscImageDrawLine(img,xc + x,yc - y,xc - x,yc - y,c); 81 if (s >= 0) { s += 4*a2*(1-y); y--; } 82 s += b2*((4*x)+6); 83 } 84 for (x = w, y = 0, s = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) { 85 PetscImageDrawLine(img,xc + x,yc + y,xc - x,yc + y,c); 86 PetscImageDrawLine(img,xc + x,yc - y,xc - x,yc - y,c); 87 if (s >= 0) { s += 4*b2*(1-x); x--; } 88 s += a2*((4*y)+6); 89 } 90 } 91 92 PETSC_STATIC_INLINE void PetscImageDrawTriangle(PetscImage img,int x_1,int y_1,int t_1,int x_2,int y_2,int t_2,int x_3,int y_3,int t_3) 93 { 94 const int SHIFT_VAL = 6; 95 const int xmin = img->clip[0], xmax = img->clip[2]-1; 96 const int ymin = img->clip[1], ymax = img->clip[3]-1; 97 float rfrac,lfrac, one = 1; 98 float R_y2_y1,R_y3_y1,R_y3_y2; 99 int lc,rc = 0,lx,rx = 0,xx,y,c; 100 int rc_lc,rx_lx,t2_t1,x2_x1,t3_t1,x3_x1,t3_t2,x3_x2; 101 102 /* Is triangle ever visible in image? */ 103 if (x_1 < xmin && x_2 < xmin && x_3 < xmin) return; 104 if (y_1 < ymin && y_2 < ymin && y_3 < ymin) return; 105 if (x_1 > xmax && x_2 > xmax && x_3 > xmax) return; 106 if (y_1 > ymax && y_2 > ymax && y_3 > ymax) return; 107 108 t_1 = t_1 << SHIFT_VAL; 109 t_2 = t_2 << SHIFT_VAL; 110 t_3 = t_3 << SHIFT_VAL; 111 112 /* Sort the vertices */ 113 #define SWAP(a,b) do {int _tmp; _tmp=a; a=b; b=_tmp;} while (0) 114 if (y_1 > y_2) {SWAP(x_1,x_2); SWAP(y_1,y_2); SWAP(t_1,t_2);} 115 if (y_1 > y_3) {SWAP(x_1,x_3); SWAP(y_1,y_3); SWAP(t_1,t_3);} 116 if (y_2 > y_3) {SWAP(x_2,x_3); SWAP(y_2,y_3); SWAP(t_2,t_3);} 117 #undef SWAP 118 119 /* This code is decidely non-optimal; 120 it is intended to be a start at an implementation */ 121 122 t2_t1 = t_2 - t_1; 123 x2_x1 = x_2 - x_1; 124 R_y2_y1 = (y_2 != y_1) ? one/(y_2-y_1) : 0; 125 R_y3_y1 = (y_3 != y_1) ? one/(y_3-y_1) : 0; 126 x3_x1 = x_3 - x_1; 127 t3_t1 = t_3 - t_1; 128 129 for (y=y_1; y<=y_2; y++) { 130 /* Draw a line with the correct color from t1-t2 to t1-t3 */ 131 /* Left color is (y-y1)/(y2-y1) * (t2-t1) + t1 */ 132 lfrac = (y - y_1) * R_y2_y1; 133 lc = (int)(lfrac * (t2_t1) + t_1); 134 lx = (int)(lfrac * (x2_x1) + x_1); 135 /* Right color is (y-y1)/(y3-y1) * (t3-t1) + t1 */ 136 rfrac = (y - y_1) * R_y3_y1; 137 rc = (int)(rfrac * (t3_t1) + t_1); 138 rx = (int)(rfrac * (x3_x1) + x_1); 139 /* Draw the line */ 140 rc_lc = rc - lc; 141 rx_lx = rx - lx; 142 if (rx > lx) { 143 for (xx=lx; xx<=rx; xx++) { 144 c = (((xx-lx) * (rc_lc)) / (rx_lx) + lc) >> SHIFT_VAL; 145 PetscImageDrawPixel(img,xx,y,c); 146 } 147 } else if (rx < lx) { 148 for (xx=lx; xx>=rx; xx--) { 149 c = (((xx-lx) * (rc_lc)) / (rx_lx) + lc) >> SHIFT_VAL; 150 PetscImageDrawPixel(img,xx,y,c); 151 } 152 } else { 153 c = lc >> SHIFT_VAL; 154 PetscImageDrawPixel(img,lx,y,c); 155 } 156 } 157 158 /* For simplicity,"move" t1 to the intersection of t1-t3 with the line y=y2. 159 We take advantage of the previous iteration. */ 160 if (y_2 >= y_3) return; 161 if (y_1 < y_2) { 162 x_1 = rx; 163 y_1 = y_2; 164 t_1 = rc; 165 x3_x1 = x_3 - x_1; 166 t3_t1 = t_3 - t_1; 167 } 168 R_y3_y1 = (y_3 != y_1) ? one/(y_3-y_1) : 0; 169 R_y3_y2 = (y_3 != y_2) ? one/(y_3-y_2) : 0; 170 x3_x2 = x_3 - x_2; 171 t3_t2 = t_3 - t_2; 172 173 for (y=y_2; y<=y_3; y++) { 174 /* Draw a line with the correct color from t2-t3 to t1-t3 */ 175 /* Left color is (y-y1)/(y2-y1) * (t2-t1) + t1 */ 176 lfrac = (y - y_2) * R_y3_y2; 177 lc = (int)(lfrac * (t3_t2) + t_2); 178 lx = (int)(lfrac * (x3_x2) + x_2); 179 /* Right color is (y-y1)/(y3-y1) * (t3-t1) + t1 */ 180 rfrac = (y - y_1) * R_y3_y1; 181 rc = (int)(rfrac * (t3_t1) + t_1); 182 rx = (int)(rfrac * (x3_x1) + x_1); 183 /* Draw the line */ 184 rc_lc = rc - lc; 185 rx_lx = rx - lx; 186 if (rx > lx) { 187 for (xx=lx; xx<=rx; xx++) { 188 c = (((xx-lx) * (rc_lc)) / (rx_lx) + lc) >> SHIFT_VAL; 189 PetscImageDrawPixel(img,xx,y,c); 190 } 191 } else if (rx < lx) { 192 for (xx=lx; xx>=rx; xx--) { 193 c = (((xx-lx) * (rc_lc)) / (rx_lx) + lc) >> SHIFT_VAL; 194 PetscImageDrawPixel(img,xx,y,c); 195 } 196 } else { 197 c = lc >> SHIFT_VAL; 198 PetscImageDrawPixel(img,lx,y,c); 199 } 200 } 201 } 202 203 #define PetscImageFontWidth 6 204 #define PetscImageFontHeight 10 205 static const unsigned char PetscImageFontBitmap[128-32][10] = { 206 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* */ 207 {0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x08, 0x00, 0x00}, /* ! */ 208 {0x00, 0x14, 0x14, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* " */ 209 {0x00, 0x14, 0x14, 0x3E, 0x14, 0x3E, 0x14, 0x14, 0x00, 0x00}, /* # */ 210 {0x00, 0x08, 0x1C, 0x28, 0x1C, 0x0A, 0x1C, 0x08, 0x00, 0x00}, /* $ */ 211 {0x00, 0x12, 0x2A, 0x14, 0x08, 0x14, 0x2A, 0x24, 0x00, 0x00}, /* % */ 212 {0x00, 0x10, 0x28, 0x28, 0x10, 0x2A, 0x24, 0x1A, 0x00, 0x00}, /* & */ 213 {0x00, 0x08, 0x08, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ' */ 214 {0x00, 0x04, 0x08, 0x10, 0x10, 0x10, 0x08, 0x04, 0x00, 0x00}, /* ( */ 215 {0x00, 0x10, 0x08, 0x04, 0x04, 0x04, 0x08, 0x10, 0x00, 0x00}, /*) */ 216 {0x00, 0x00, 0x22, 0x14, 0x3E, 0x14, 0x22, 0x00, 0x00, 0x00}, /* * */ 217 {0x00, 0x00, 0x08, 0x08, 0x3E, 0x08, 0x08, 0x00, 0x00, 0x00}, /* + */ 218 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x08, 0x10, 0x00}, /* , */ 219 {0x00, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x00, 0x00, 0x00}, /* - */ 220 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x1C, 0x08, 0x00}, /* . */ 221 {0x00, 0x02, 0x02, 0x04, 0x08, 0x10, 0x20, 0x20, 0x00, 0x00}, /* / */ 222 {0x00, 0x08, 0x14, 0x22, 0x22, 0x22, 0x14, 0x08, 0x00, 0x00}, /* 0 */ 223 {0x00, 0x08, 0x18, 0x28, 0x08, 0x08, 0x08, 0x3E, 0x00, 0x00}, /* 1 */ 224 {0x00, 0x1C, 0x22, 0x02, 0x0C, 0x10, 0x20, 0x3E, 0x00, 0x00}, /* 2 */ 225 {0x00, 0x3E, 0x02, 0x04, 0x0C, 0x02, 0x22, 0x1C, 0x00, 0x00}, /* 3 */ 226 {0x00, 0x04, 0x0C, 0x14, 0x24, 0x3E, 0x04, 0x04, 0x00, 0x00}, /* 4 */ 227 {0x00, 0x3E, 0x20, 0x2C, 0x32, 0x02, 0x22, 0x1C, 0x00, 0x00}, /* 5 */ 228 {0x00, 0x0C, 0x10, 0x20, 0x2C, 0x32, 0x22, 0x1C, 0x00, 0x00}, /* 6 */ 229 {0x00, 0x3E, 0x02, 0x04, 0x04, 0x08, 0x10, 0x10, 0x00, 0x00}, /* 7 */ 230 {0x00, 0x1C, 0x22, 0x22, 0x1C, 0x22, 0x22, 0x1C, 0x00, 0x00}, /* 8 */ 231 {0x00, 0x1C, 0x22, 0x26, 0x1A, 0x02, 0x04, 0x18, 0x00, 0x00}, /* 9 */ 232 {0x00, 0x00, 0x08, 0x1C, 0x08, 0x00, 0x08, 0x1C, 0x08, 0x00}, /* : */ 233 {0x00, 0x00, 0x08, 0x1C, 0x08, 0x00, 0x0C, 0x08, 0x10, 0x00}, /* } */ 234 {0x00, 0x02, 0x04, 0x08, 0x10, 0x08, 0x04, 0x02, 0x00, 0x00}, /* < */ 235 {0x00, 0x00, 0x00, 0x3E, 0x00, 0x3E, 0x00, 0x00, 0x00, 0x00}, /* = */ 236 {0x00, 0x10, 0x08, 0x04, 0x02, 0x04, 0x08, 0x10, 0x00, 0x00}, /* > */ 237 {0x00, 0x1C, 0x22, 0x04, 0x08, 0x08, 0x00, 0x08, 0x00, 0x00}, /* ? */ 238 {0x00, 0x1C, 0x22, 0x26, 0x2A, 0x2C, 0x20, 0x1C, 0x00, 0x00}, /* @ */ 239 {0x00, 0x08, 0x14, 0x22, 0x22, 0x3E, 0x22, 0x22, 0x00, 0x00}, /* A */ 240 {0x00, 0x3C, 0x12, 0x12, 0x1C, 0x12, 0x12, 0x3C, 0x00, 0x00}, /* B */ 241 {0x00, 0x1C, 0x22, 0x20, 0x20, 0x20, 0x22, 0x1C, 0x00, 0x00}, /* C */ 242 {0x00, 0x3C, 0x12, 0x12, 0x12, 0x12, 0x12, 0x3C, 0x00, 0x00}, /* D */ 243 {0x00, 0x3E, 0x20, 0x20, 0x3C, 0x20, 0x20, 0x3E, 0x00, 0x00}, /* E */ 244 {0x00, 0x3E, 0x20, 0x20, 0x3C, 0x20, 0x20, 0x20, 0x00, 0x00}, /* F */ 245 {0x00, 0x1C, 0x22, 0x20, 0x20, 0x26, 0x22, 0x1C, 0x00, 0x00}, /* G */ 246 {0x00, 0x22, 0x22, 0x22, 0x3E, 0x22, 0x22, 0x22, 0x00, 0x00}, /* H */ 247 {0x00, 0x1C, 0x08, 0x08, 0x08, 0x08, 0x08, 0x1C, 0x00, 0x00}, /* I */ 248 {0x00, 0x0E, 0x04, 0x04, 0x04, 0x04, 0x24, 0x18, 0x00, 0x00}, /* J */ 249 {0x00, 0x22, 0x24, 0x28, 0x30, 0x28, 0x24, 0x22, 0x00, 0x00}, /* K */ 250 {0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x3E, 0x00, 0x00}, /* L */ 251 {0x00, 0x22, 0x22, 0x36, 0x2A, 0x22, 0x22, 0x22, 0x00, 0x00}, /* M */ 252 {0x00, 0x22, 0x22, 0x32, 0x2A, 0x26, 0x22, 0x22, 0x00, 0x00}, /* N */ 253 {0x00, 0x1C, 0x22, 0x22, 0x22, 0x22, 0x22, 0x1C, 0x00, 0x00}, /* O */ 254 {0x00, 0x3C, 0x22, 0x22, 0x3C, 0x20, 0x20, 0x20, 0x00, 0x00}, /* P */ 255 {0x00, 0x1C, 0x22, 0x22, 0x22, 0x22, 0x2A, 0x1C, 0x02, 0x00}, /* Q */ 256 {0x00, 0x3C, 0x22, 0x22, 0x3C, 0x28, 0x24, 0x22, 0x00, 0x00}, /* R */ 257 {0x00, 0x1C, 0x22, 0x20, 0x1C, 0x02, 0x22, 0x1C, 0x00, 0x00}, /* S */ 258 {0x00, 0x3E, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00}, /* T */ 259 {0x00, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x1C, 0x00, 0x00}, /* U */ 260 {0x00, 0x22, 0x22, 0x22, 0x14, 0x14, 0x14, 0x08, 0x00, 0x00}, /* V */ 261 {0x00, 0x22, 0x22, 0x22, 0x2A, 0x2A, 0x36, 0x22, 0x00, 0x00}, /* W */ 262 {0x00, 0x22, 0x22, 0x14, 0x08, 0x14, 0x22, 0x22, 0x00, 0x00}, /* X */ 263 {0x00, 0x22, 0x22, 0x14, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00}, /* Y */ 264 {0x00, 0x3E, 0x02, 0x04, 0x08, 0x10, 0x20, 0x3E, 0x00, 0x00}, /* Z */ 265 {0x00, 0x1C, 0x10, 0x10, 0x10, 0x10, 0x10, 0x1C, 0x00, 0x00}, /* [ */ 266 {0x00, 0x20, 0x20, 0x10, 0x08, 0x04, 0x02, 0x02, 0x00, 0x00}, /* \ */ 267 {0x00, 0x1C, 0x04, 0x04, 0x04, 0x04, 0x04, 0x1C, 0x00, 0x00}, /* ] */ 268 {0x00, 0x08, 0x14, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ^ */ 269 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x00}, /* _ */ 270 {0x08, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ` */ 271 {0x00, 0x00, 0x00, 0x1C, 0x02, 0x1E, 0x22, 0x1E, 0x00, 0x00}, /* a */ 272 {0x00, 0x20, 0x20, 0x2C, 0x32, 0x22, 0x32, 0x2C, 0x00, 0x00}, /* b */ 273 {0x00, 0x00, 0x00, 0x1C, 0x22, 0x20, 0x22, 0x1C, 0x00, 0x00}, /* c */ 274 {0x00, 0x02, 0x02, 0x1A, 0x26, 0x22, 0x26, 0x1A, 0x00, 0x00}, /* d */ 275 {0x00, 0x00, 0x00, 0x1C, 0x22, 0x3E, 0x20, 0x1C, 0x00, 0x00}, /* e */ 276 {0x00, 0x0C, 0x12, 0x10, 0x3C, 0x10, 0x10, 0x10, 0x00, 0x00}, /* f */ 277 {0x00, 0x00, 0x00, 0x1E, 0x22, 0x22, 0x1E, 0x02, 0x22, 0x1C}, /* g */ 278 {0x00, 0x20, 0x20, 0x2C, 0x32, 0x22, 0x22, 0x22, 0x00, 0x00}, /* h */ 279 {0x00, 0x08, 0x00, 0x18, 0x08, 0x08, 0x08, 0x1C, 0x00, 0x00}, /* i */ 280 {0x00, 0x02, 0x00, 0x06, 0x02, 0x02, 0x02, 0x12, 0x12, 0x0C}, /* j */ 281 {0x00, 0x20, 0x20, 0x22, 0x24, 0x38, 0x24, 0x22, 0x00, 0x00}, /* k */ 282 {0x00, 0x18, 0x08, 0x08, 0x08, 0x08, 0x08, 0x1C, 0x00, 0x00}, /* l */ 283 {0x00, 0x00, 0x00, 0x34, 0x2A, 0x2A, 0x2A, 0x22, 0x00, 0x00}, /* m */ 284 {0x00, 0x00, 0x00, 0x2C, 0x32, 0x22, 0x22, 0x22, 0x00, 0x00}, /* n */ 285 {0x00, 0x00, 0x00, 0x1C, 0x22, 0x22, 0x22, 0x1C, 0x00, 0x00}, /* o */ 286 {0x00, 0x00, 0x00, 0x2C, 0x32, 0x22, 0x32, 0x2C, 0x20, 0x20}, /* p */ 287 {0x00, 0x00, 0x00, 0x1A, 0x26, 0x22, 0x26, 0x1A, 0x02, 0x02}, /* q */ 288 {0x00, 0x00, 0x00, 0x2C, 0x32, 0x20, 0x20, 0x20, 0x00, 0x00}, /* r */ 289 {0x00, 0x00, 0x00, 0x1C, 0x20, 0x1C, 0x02, 0x3C, 0x00, 0x00}, /* s */ 290 {0x00, 0x10, 0x10, 0x3C, 0x10, 0x10, 0x12, 0x0C, 0x00, 0x00}, /* t */ 291 {0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x26, 0x1A, 0x00, 0x00}, /* u */ 292 {0x00, 0x00, 0x00, 0x22, 0x22, 0x14, 0x14, 0x08, 0x00, 0x00}, /* v */ 293 {0x00, 0x00, 0x00, 0x22, 0x22, 0x2A, 0x2A, 0x14, 0x00, 0x00}, /* w */ 294 {0x00, 0x00, 0x00, 0x22, 0x14, 0x08, 0x14, 0x22, 0x00, 0x00}, /* x */ 295 {0x00, 0x00, 0x00, 0x22, 0x22, 0x26, 0x1A, 0x02, 0x22, 0x1C}, /* y */ 296 {0x00, 0x00, 0x00, 0x3E, 0x04, 0x08, 0x10, 0x3E, 0x00, 0x00}, /* z */ 297 {0x00, 0x06, 0x08, 0x04, 0x18, 0x04, 0x08, 0x06, 0x00, 0x00}, /* { */ 298 {0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00}, /* | */ 299 {0x00, 0x18, 0x04, 0x08, 0x06, 0x08, 0x04, 0x18, 0x00, 0x00}, /* } */ 300 {0x00, 0x12, 0x2A, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ~ */ 301 {0x00, 0x2A, 0x00, 0x22, 0x00, 0x22, 0x00, 0x2A, 0x00, 0x00}, /* ASCII 127 */ 302 }; 303 304 PETSC_STATIC_INLINE void PetscImageDrawText(PetscImage img,int x, int y,int c,const char text[]) 305 { 306 int i,j,k, tw = PetscImageFontWidth, th = PetscImageFontHeight; 307 for (i = 0; i < th; i++) { 308 for (k = 0; text[k]; k++) { 309 int chr = PetscClipInterval(text[k],32,127); 310 for (j = 0; j < tw; j++) { 311 if (PetscImageFontBitmap[chr-32][i] & (1<<(tw-1-j))) 312 PetscImageDrawPixel(img,x+j+k*tw,y+i-th,c); 313 } 314 } 315 } 316 } 317 318 #endif 319