comparison: components/u8g2/csrc/u8g2_hvline.c
components/u8g2/csrc/u8g2_hvline.c
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| 1 /* | |
| 2 | |
| 3 u8g2_hvline.c | |
| 4 | |
| 5 Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) | |
| 6 | |
| 7 Copyright (c) 2016, olikraus@gmail.com | |
| 8 All rights reserved. | |
| 9 | |
| 10 Redistribution and use in source and binary forms, with or without modification, | |
| 11 are permitted provided that the following conditions are met: | |
| 12 | |
| 13 * Redistributions of source code must retain the above copyright notice, this list | |
| 14 of conditions and the following disclaimer. | |
| 15 | |
| 16 * Redistributions in binary form must reproduce the above copyright notice, this | |
| 17 list of conditions and the following disclaimer in the documentation and/or other | |
| 18 materials provided with the distribution. | |
| 19 | |
| 20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND | |
| 21 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
| 22 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 23 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 24 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR | |
| 25 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 26 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 27 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 30 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 31 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 32 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 33 | |
| 34 | |
| 35 Calltree | |
| 36 | |
| 37 void u8g2_DrawHVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir) | |
| 38 u8g2->cb->draw_l90 | |
| 39 u8g2_draw_hv_line_2dir | |
| 40 u8g2->ll_hvline(u8g2, x, y, len, dir); | |
| 41 | |
| 42 | |
| 43 */ | |
| 44 | |
| 45 #include "u8g2.h" | |
| 46 #include <assert.h> | |
| 47 | |
| 48 /*==========================================================*/ | |
| 49 /* intersection procedure */ | |
| 50 | |
| 51 /* | |
| 52 Description: | |
| 53 clip range from pos a (included) with line len (a+len excluded) agains c (included) to d (excluded) | |
| 54 Assumptions: | |
| 55 len > 0 | |
| 56 c <= d (this is not checked) | |
| 57 will return 0 if there is no intersection and if a > b | |
| 58 | |
| 59 */ | |
| 60 | |
| 61 static uint8_t u8g2_clip_intersection2(u8g2_uint_t *ap, u8g2_uint_t *len, u8g2_uint_t c, u8g2_uint_t d) | |
| 62 { | |
| 63 u8g2_uint_t a = *ap; | |
| 64 u8g2_uint_t b; | |
| 65 b = a; | |
| 66 b += *len; | |
| 67 | |
| 68 /* | |
| 69 Description: | |
| 70 clip range from a (included) to b (excluded) agains c (included) to d (excluded) | |
| 71 Assumptions: | |
| 72 a <= b (violation is checked and handled correctly) | |
| 73 c <= d (this is not checked) | |
| 74 will return 0 if there is no intersection and if a > b | |
| 75 | |
| 76 optimized clipping: c is set to 0 --> 27 Oct 2018: again removed the c==0 assumption | |
| 77 | |
| 78 replaced by uint8_t u8g2_clip_intersection2 | |
| 79 */ | |
| 80 | |
| 81 /* handle the a>b case correctly. If code and time is critical, this could */ | |
| 82 /* be removed completly (be aware about memory curruption for wrong */ | |
| 83 /* arguments) or return 0 for a>b (will lead to skipped lines for wrong */ | |
| 84 /* arguments) */ | |
| 85 | |
| 86 /* removing the following if clause completly may lead to memory corruption of a>b */ | |
| 87 if ( a > b ) | |
| 88 { | |
| 89 /* replacing this if with a simple "return 0;" will not handle the case with negative a */ | |
| 90 if ( a < d ) | |
| 91 { | |
| 92 b = d; | |
| 93 b--; | |
| 94 } | |
| 95 else | |
| 96 { | |
| 97 a = c; | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 /* from now on, the asumption a <= b is ok */ | |
| 102 | |
| 103 if ( a >= d ) | |
| 104 return 0; | |
| 105 if ( b <= c ) | |
| 106 return 0; | |
| 107 if ( a < c ) | |
| 108 a = c; | |
| 109 if ( b > d ) | |
| 110 b = d; | |
| 111 | |
| 112 *ap = a; | |
| 113 b -= a; | |
| 114 *len = b; | |
| 115 return 1; | |
| 116 } | |
| 117 | |
| 118 | |
| 119 | |
| 120 /*==========================================================*/ | |
| 121 /* draw procedures */ | |
| 122 | |
| 123 /* | |
| 124 x,y Upper left position of the line within the pixel buffer | |
| 125 len length of the line in pixel, len must not be 0 | |
| 126 dir 0: horizontal line (left to right) | |
| 127 1: vertical line (top to bottom) | |
| 128 This function first adjusts the y position to the local buffer. Then it | |
| 129 will clip the line and call u8g2_draw_low_level_hv_line() | |
| 130 | |
| 131 */ | |
| 132 void u8g2_draw_hv_line_2dir(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir) | |
| 133 { | |
| 134 | |
| 135 /* clipping happens before the display rotation */ | |
| 136 | |
| 137 /* transform to pixel buffer coordinates */ | |
| 138 y -= u8g2->pixel_curr_row; | |
| 139 | |
| 140 u8g2->ll_hvline(u8g2, x, y, len, dir); | |
| 141 } | |
| 142 | |
| 143 | |
| 144 /* | |
| 145 This is the toplevel function for the hv line draw procedures. | |
| 146 This function should be called by the user. | |
| 147 | |
| 148 "dir" may have 4 directions: 0 (left to right), 1, 2, 3 (down up) | |
| 149 */ | |
| 150 void u8g2_DrawHVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir) | |
| 151 { | |
| 152 /* Make a call to the callback function (e.g. u8g2_draw_l90_r0). */ | |
| 153 /* The callback may rotate the hv line */ | |
| 154 /* after rotation this will call u8g2_draw_hv_line_4dir() */ | |
| 155 | |
| 156 #ifdef U8G2_WITH_CLIP_WINDOW_SUPPORT | |
| 157 if ( u8g2->is_page_clip_window_intersection != 0 ) | |
| 158 #endif /* U8G2_WITH_CLIP_WINDOW_SUPPORT */ | |
| 159 if ( len != 0 ) | |
| 160 { | |
| 161 | |
| 162 /* convert to two directions */ | |
| 163 if ( len > 1 ) | |
| 164 { | |
| 165 if ( dir == 2 ) | |
| 166 { | |
| 167 x -= len; | |
| 168 x++; | |
| 169 } | |
| 170 else if ( dir == 3 ) | |
| 171 { | |
| 172 y -= len; | |
| 173 y++; | |
| 174 } | |
| 175 } | |
| 176 dir &= 1; | |
| 177 | |
| 178 /* clip against the user window */ | |
| 179 if ( dir == 0 ) | |
| 180 { | |
| 181 if ( y < u8g2->user_y0 ) | |
| 182 return; | |
| 183 if ( y >= u8g2->user_y1 ) | |
| 184 return; | |
| 185 if ( u8g2_clip_intersection2(&x, &len, u8g2->user_x0, u8g2->user_x1) == 0 ) | |
| 186 return; | |
| 187 } | |
| 188 else | |
| 189 { | |
| 190 if ( x < u8g2->user_x0 ) | |
| 191 return; | |
| 192 if ( x >= u8g2->user_x1 ) | |
| 193 return; | |
| 194 if ( u8g2_clip_intersection2(&y, &len, u8g2->user_y0, u8g2->user_y1) == 0 ) | |
| 195 return; | |
| 196 } | |
| 197 | |
| 198 | |
| 199 u8g2->cb->draw_l90(u8g2, x, y, len, dir); | |
| 200 } | |
| 201 } | |
| 202 | |
| 203 void u8g2_DrawHLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len) | |
| 204 { | |
| 205 // #ifdef U8G2_WITH_INTERSECTION | |
| 206 // if ( u8g2_IsIntersection(u8g2, x, y, x+len, y+1) == 0 ) | |
| 207 // return; | |
| 208 // #endif /* U8G2_WITH_INTERSECTION */ | |
| 209 u8g2_DrawHVLine(u8g2, x, y, len, 0); | |
| 210 } | |
| 211 | |
| 212 void u8g2_DrawVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len) | |
| 213 { | |
| 214 // #ifdef U8G2_WITH_INTERSECTION | |
| 215 // if ( u8g2_IsIntersection(u8g2, x, y, x+1, y+len) == 0 ) | |
| 216 // return; | |
| 217 // #endif /* U8G2_WITH_INTERSECTION */ | |
| 218 u8g2_DrawHVLine(u8g2, x, y, len, 1); | |
| 219 } | |
| 220 | |
| 221 void u8g2_DrawPixel(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y) | |
| 222 { | |
| 223 #ifdef U8G2_WITH_INTERSECTION | |
| 224 if ( y < u8g2->user_y0 ) | |
| 225 return; | |
| 226 if ( y >= u8g2->user_y1 ) | |
| 227 return; | |
| 228 if ( x < u8g2->user_x0 ) | |
| 229 return; | |
| 230 if ( x >= u8g2->user_x1 ) | |
| 231 return; | |
| 232 #endif /* U8G2_WITH_INTERSECTION */ | |
| 233 u8g2_DrawHVLine(u8g2, x, y, 1, 0); | |
| 234 } | |
| 235 | |
| 236 /* | |
| 237 Assign the draw color for all drawing functions. | |
| 238 color may be 0 or 1. The actual color is defined by the display. | |
| 239 With color = 1 the drawing function will set the display memory to 1. | |
| 240 For OLEDs this ususally means, that the pixel is enabled and the LED | |
| 241 at the pixel is turned on. | |
| 242 On an LCD it usually means that the LCD segment of the pixel is enabled, | |
| 243 which absorbs the light. | |
| 244 For eInk/ePaper it means black ink. | |
| 245 | |
| 246 7 Jan 2017: Allow color value 2 for XOR operation. | |
| 247 | |
| 248 */ | |
| 249 void u8g2_SetDrawColor(u8g2_t *u8g2, uint8_t color) | |
| 250 { | |
| 251 u8g2->draw_color = color; /* u8g2_SetDrawColor: just assign the argument */ | |
| 252 if ( color >= 3 ) | |
| 253 u8g2->draw_color = 1; /* u8g2_SetDrawColor: make color as one if arg is invalid */ | |
| 254 } | |
| 255 |
