apps/plugins/lib/xlcd_draw.c

   1 /***************************************************************************
   2 *             __________               __   ___.
   3 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7 *                     \/            \/     \/    \/            \/
   8 * $Id$
   9 *
  10 * Additional LCD routines not present in the rockbox core
  11 * Drawing functions
  12 *
  13 * Copyright (C) 2005 Jens Arnold
  14 *
  15 * All files in this archive are subject to the GNU General Public License.
  16 * See the file COPYING in the source tree root for full license agreement.
  17 *
  18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19 * KIND, either express or implied.
  20 *
  21 ****************************************************************************/
  22
  23 #include "plugin.h"
  24
  25 #ifdef HAVE_LCD_BITMAP
  26 #include "xlcd.h"
  27
  28 /* sort the given coordinates by increasing x value */
  29 static void sort_points_by_increasing_x(int* x1, int* y1,
  30                                         int* x2, int* y2,
  31                                         int* x3, int* y3)
  32 {
  33     int x, y;
  34     if (*x1 > *x3)
  35     {
  36         if (*x2 < *x3)       /* x2 < x3 < x1 */
  37         {
  38             x = *x1; *x1 = *x2; *x2 = *x3; *x3 = x;
  39             y = *y1; *y1 = *y2; *y2 = *y3; *y3 = y;
  40         }
  41         else if (*x2 > *x1)  /* x3 < x1 < x2 */
  42         {
  43             x = *x1; *x1 = *x3; *x3 = *x2; *x2 = x;
  44             y = *y1; *y1 = *y3; *y3 = *y2; *y2 = y;
  45         }
  46         else               /* x3 <= x2 <= x1 */
  47         {
  48             x = *x1; *x1 = *x3; *x3 = x;
  49             y = *y1; *y1 = *y3; *y3 = y;
  50         }
  51     }
  52     else
  53     {
  54         if (*x2 < *x1)       /* x2 < x1 <= x3 */
  55         {
  56             x = *x1; *x1 = *x2; *x2 = x;
  57             y = *y1; *y1 = *y2; *y2 = y;
  58         }
  59         else if (*x2 > *x3)  /* x1 <= x3 < x2 */
  60         {
  61             x = *x2; *x2 = *x3; *x3 = x;
  62             y = *y2; *y2 = *y3; *y3 = y;
  63         }
  64         /* else already sorted */
  65     }
  66 }
  67
  68 #define sort_points_by_increasing_y(x1, y1, x2, y2, x3, y3) \
  69     sort_points_by_increasing_x(y1, x1, y2, x2, y3, x3)
  70
  71 /* draw a filled triangle, using horizontal lines for speed */
  72 static void xlcd_filltriangle_horizontal(struct screen* display,
  73                                          int x1, int y1,
  74                                          int x2, int y2,
  75                                          int x3, int y3)
  76 {
  77     long fp_x1, fp_x2, fp_dx1, fp_dx2;
  78     int y;
  79     sort_points_by_increasing_y(&x1, &y1, &x2, &y2, &x3, &y3);
  80
  81     if (y1 < y3)  /* draw */
  82     {
  83         fp_dx1 = ((x3 - x1) << 16) / (y3 - y1);
  84         fp_x1  = (x1 << 16) + (1<<15) + (fp_dx1 >> 1);
  85
  86         if (y1 < y2)  /* first part */
  87         {
  88             fp_dx2 = ((x2 - x1) << 16) / (y2 - y1);
  89             fp_x2  = (x1 << 16) + (1<<15) + (fp_dx2 >> 1);
  90             for (y = y1; y < y2; y++)
  91             {
  92                 display->hline(fp_x1 >> 16, fp_x2 >> 16, y);
  93                 fp_x1 += fp_dx1;
  94                 fp_x2 += fp_dx2;
  95             }
  96         }
  97         if (y2 < y3)  /* second part */
  98         {
  99             fp_dx2 = ((x3 - x2) << 16) / (y3 - y2);
 100             fp_x2 = (x2 << 16) + (1<<15) + (fp_dx2 >> 1);
 101             for (y = y2; y < y3; y++)
 102             {
 103                 display->hline(fp_x1 >> 16, fp_x2 >> 16, y);
 104                 fp_x1 += fp_dx1;
 105                 fp_x2 += fp_dx2;
 106             }
 107         }
 108     }
 109 }
 110
 111 /* draw a filled triangle, using vertical lines for speed */
 112 static void xlcd_filltriangle_vertical(struct screen* display,
 113                                        int x1, int y1,
 114                                        int x2, int y2,
 115                                        int x3, int y3)
 116 {
 117     long fp_y1, fp_y2, fp_dy1, fp_dy2;
 118     int x;
 119     sort_points_by_increasing_x(&x1, &y1, &x2, &y2, &x3, &y3);
 120
 121     if (x1 < x3)  /* draw */
 122     {
 123         fp_dy1 = ((y3 - y1) << 16) / (x3 - x1);
 124         fp_y1  = (y1 << 16) + (1<<15) + (fp_dy1 >> 1);
 125
 126         if (x1 < x2)  /* first part */
 127         {
 128             fp_dy2 = ((y2 - y1) << 16) / (x2 - x1);
 129             fp_y2  = (y1 << 16) + (1<<15) + (fp_dy2 >> 1);
 130             for (x = x1; x < x2; x++)
 131             {
 132                 display->vline(x, fp_y1 >> 16, fp_y2 >> 16);
 133                 fp_y1 += fp_dy1;
 134                 fp_y2 += fp_dy2;
 135             }
 136         }
 137         if (x2 < x3)  /* second part */
 138         {
 139             fp_dy2 = ((y3 - y2) << 16) / (x3 - x2);
 140             fp_y2 = (y2 << 16) + (1<<15) + (fp_dy2 >> 1);
 141             for (x = x2; x < x3; x++)
 142             {
 143                 display->vline(x, fp_y1 >> 16, fp_y2 >> 16);
 144                 fp_y1 += fp_dy1;
 145                 fp_y2 += fp_dy2;
 146             }
 147         }
 148     }
 149 }
 150
 151 void xlcd_filltriangle(int x1, int y1,
 152                        int x2, int y2,
 153                        int x3, int y3)
 154 {
 155     /* default is main screen */
 156     xlcd_filltriangle_screen(_xlcd_rb->screens[SCREEN_MAIN],
 157                              x1, y1, x2, y2, x3, y3);
 158 }
 159
 160 void xlcd_filltriangle_screen(struct screen* display,
 161                               int x1, int y1,
 162                               int x2, int y2,
 163                               int x3, int y3)
 164 {
 165     if(display->pixel_format==HORIZONTAL_PACKING || display->depth>=8)
 166         xlcd_filltriangle_horizontal(display, x1, y1, x2, y2, x3, y3);
 167     else
 168         xlcd_filltriangle_vertical(display, x1, y1, x2, y2, x3, y3);
 169 }
 170
 171 #if LCD_DEPTH >= 8
 172
 173 #ifdef HAVE_LCD_COLOR
 174 static const fb_data graylut[256] = {
 175 #if LCD_PIXELFORMAT == RGB565
 176     0x0000, 0x0000, 0x0000, 0x0020, 0x0020, 0x0821, 0x0821, 0x0841,
 177     0x0841, 0x0841, 0x0841, 0x0861, 0x0861, 0x1062, 0x1062, 0x1082,
 178     0x1082, 0x1082, 0x1082, 0x10a2, 0x10a2, 0x18a3, 0x18a3, 0x18c3,
 179     0x18c3, 0x18c3, 0x18c3, 0x18e3, 0x18e3, 0x20e4, 0x20e4, 0x2104,
 180     0x2104, 0x2104, 0x2104, 0x2124, 0x2124, 0x2124, 0x2925, 0x2945,
 181     0x2945, 0x2945, 0x2945, 0x2965, 0x2965, 0x2965, 0x3166, 0x3186,
 182     0x3186, 0x3186, 0x3186, 0x31a6, 0x31a6, 0x31a6, 0x39a7, 0x39c7,
 183     0x39c7, 0x39c7, 0x39c7, 0x39e7, 0x39e7, 0x39e7, 0x41e8, 0x4208,
 184     0x4208, 0x4208, 0x4208, 0x4228, 0x4228, 0x4228, 0x4a29, 0x4a49,
 185     0x4a49, 0x4a49, 0x4a49, 0x4a69, 0x4a69, 0x4a69, 0x4a69, 0x528a,
 186     0x528a, 0x528a, 0x528a, 0x52aa, 0x52aa, 0x52aa, 0x52aa, 0x5aab,
 187     0x5acb, 0x5acb, 0x5acb, 0x5acb, 0x5aeb, 0x5aeb, 0x5aeb, 0x62ec,
 188     0x630c, 0x630c, 0x630c, 0x630c, 0x632c, 0x632c, 0x632c, 0x6b2d,
 189     0x6b4d, 0x6b4d, 0x6b4d, 0x6b4d, 0x6b6d, 0x6b6d, 0x6b6d, 0x6b6d,
 190     0x738e, 0x738e, 0x738e, 0x738e, 0x73ae, 0x73ae, 0x73ae, 0x73ae,
 191     0x7bcf, 0x7bcf, 0x7bcf, 0x7bcf, 0x7bef, 0x7bef, 0x7bef, 0x7bef,
 192     0x8410, 0x8410, 0x8410, 0x8410, 0x8430, 0x8430, 0x8430, 0x8430,
 193     0x8c51, 0x8c51, 0x8c51, 0x8c51, 0x8c71, 0x8c71, 0x8c71, 0x8c71,
 194     0x9492, 0x9492, 0x9492, 0x9492, 0x94b2, 0x94b2, 0x94b2, 0x94b2,
 195     0x94d2, 0x9cd3, 0x9cd3, 0x9cd3, 0x9cf3, 0x9cf3, 0x9cf3, 0x9cf3,
 196     0x9d13, 0xa514, 0xa514, 0xa514, 0xa534, 0xa534, 0xa534, 0xa534,
 197     0xa554, 0xad55, 0xad55, 0xad55, 0xad55, 0xad75, 0xad75, 0xad75,
 198     0xad75, 0xb596, 0xb596, 0xb596, 0xb596, 0xb5b6, 0xb5b6, 0xb5b6,
 199     0xb5b6, 0xb5d6, 0xbdd7, 0xbdd7, 0xbdd7, 0xbdf7, 0xbdf7, 0xbdf7,
 200     0xbdf7, 0xbe17, 0xc618, 0xc618, 0xc618, 0xc638, 0xc638, 0xc638,
 201     0xc638, 0xc658, 0xce59, 0xce59, 0xce59, 0xce79, 0xce79, 0xce79,
 202     0xce79, 0xce99, 0xd69a, 0xd69a, 0xd69a, 0xd6ba, 0xd6ba, 0xd6ba,
 203     0xd6ba, 0xd6da, 0xd6da, 0xdedb, 0xdedb, 0xdefb, 0xdefb, 0xdefb,
 204     0xdefb, 0xdf1b, 0xdf1b, 0xe71c, 0xe71c, 0xe73c, 0xe73c, 0xe73c,
 205     0xe73c, 0xe75c, 0xe75c, 0xef5d, 0xef5d, 0xef7d, 0xef7d, 0xef7d,
 206     0xef7d, 0xef9d, 0xef9d, 0xf79e, 0xf79e, 0xf7be, 0xf7be, 0xf7be,
 207     0xf7be, 0xf7de, 0xf7de, 0xffdf, 0xffdf, 0xffff, 0xffff, 0xffff
 208 #elif LCD_PIXELFORMAT == RGB565SWAPPED
 209     0x0000, 0x0000, 0x0000, 0x2000, 0x2000, 0x2108, 0x2108, 0x4108,
 210     0x4108, 0x4108, 0x4108, 0x6108, 0x6108, 0x6210, 0x6210, 0x8210,
 211     0x8210, 0x8210, 0x8210, 0xa210, 0xa210, 0xa318, 0xa318, 0xc318,
 212     0xc318, 0xc318, 0xc318, 0xe318, 0xe318, 0xe420, 0xe420, 0x0421,
 213     0x0421, 0x0421, 0x0421, 0x2421, 0x2421, 0x2421, 0x2529, 0x4529,
 214     0x4529, 0x4529, 0x4529, 0x6529, 0x6529, 0x6529, 0x6631, 0x8631,
 215     0x8631, 0x8631, 0x8631, 0xa631, 0xa631, 0xa631, 0xa739, 0xc739,
 216     0xc739, 0xc739, 0xc739, 0xe739, 0xe739, 0xe739, 0xe841, 0x0842,
 217     0x0842, 0x0842, 0x0842, 0x2842, 0x2842, 0x2842, 0x294a, 0x494a,
 218     0x494a, 0x494a, 0x494a, 0x694a, 0x694a, 0x694a, 0x694a, 0x8a52,
 219     0x8a52, 0x8a52, 0x8a52, 0xaa52, 0xaa52, 0xaa52, 0xaa52, 0xab5a,
 220     0xcb5a, 0xcb5a, 0xcb5a, 0xcb5a, 0xeb5a, 0xeb5a, 0xeb5a, 0xec62,
 221     0x0c63, 0x0c63, 0x0c63, 0x0c63, 0x2c63, 0x2c63, 0x2c63, 0x2d6b,
 222     0x4d6b, 0x4d6b, 0x4d6b, 0x4d6b, 0x6d6b, 0x6d6b, 0x6d6b, 0x6d6b,
 223     0x8e73, 0x8e73, 0x8e73, 0x8e73, 0xae73, 0xae73, 0xae73, 0xae73,
 224     0xcf7b, 0xcf7b, 0xcf7b, 0xcf7b, 0xef7b, 0xef7b, 0xef7b, 0xef7b,
 225     0x1084, 0x1084, 0x1084, 0x1084, 0x3084, 0x3084, 0x3084, 0x3084,
 226     0x518c, 0x518c, 0x518c, 0x518c, 0x718c, 0x718c, 0x718c, 0x718c,
 227     0x9294, 0x9294, 0x9294, 0x9294, 0xb294, 0xb294, 0xb294, 0xb294,
 228     0xd294, 0xd39c, 0xd39c, 0xd39c, 0xf39c, 0xf39c, 0xf39c, 0xf39c,
 229     0x139d, 0x14a5, 0x14a5, 0x14a5, 0x34a5, 0x34a5, 0x34a5, 0x34a5,
 230     0x54a5, 0x55ad, 0x55ad, 0x55ad, 0x55ad, 0x75ad, 0x75ad, 0x75ad,
 231     0x75ad, 0x96b5, 0x96b5, 0x96b5, 0x96b5, 0xb6b5, 0xb6b5, 0xb6b5,
 232     0xb6b5, 0xd6b5, 0xd7bd, 0xd7bd, 0xd7bd, 0xf7bd, 0xf7bd, 0xf7bd,
 233     0xf7bd, 0x17be, 0x18c6, 0x18c6, 0x18c6, 0x38c6, 0x38c6, 0x38c6,
 234     0x38c6, 0x58c6, 0x59ce, 0x59ce, 0x59ce, 0x79ce, 0x79ce, 0x79ce,
 235     0x79ce, 0x99ce, 0x9ad6, 0x9ad6, 0x9ad6, 0xbad6, 0xbad6, 0xbad6,
 236     0xbad6, 0xdad6, 0xdad6, 0xdbde, 0xdbde, 0xfbde, 0xfbde, 0xfbde,
 237     0xfbde, 0x1bdf, 0x1bdf, 0x1ce7, 0x1ce7, 0x3ce7, 0x3ce7, 0x3ce7,
 238     0x3ce7, 0x5ce7, 0x5ce7, 0x5def, 0x5def, 0x7def, 0x7def, 0x7def,
 239     0x7def, 0x9def, 0x9def, 0x9ef7, 0x9ef7, 0xbef7, 0xbef7, 0xbef7,
 240     0xbef7, 0xdef7, 0xdef7, 0xdfff, 0xdfff, 0xffff, 0xffff, 0xffff
 241 #endif /* LCD_PIXELFORMAT */
 242 };
 243 #endif /* HAVE_LCD_COLOR */
 244
 245 /* Draw a partial greyscale bitmap, canonical 8 bit format */
 246 void xlcd_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
 247                            int stride, int x, int y, int width, int height)
 248 {
 249     const unsigned char *src_end;
 250     fb_data *dst;
 251
 252     /* nothing to draw? */
 253     if ((width <= 0) || (height <= 0) || (x >= LCD_WIDTH) || (y >= LCD_HEIGHT)
 254         || (x + width <= 0) || (y + height <= 0))
 255         return;
 256
 257     /* clipping */
 258     if (x < 0)
 259     {
 260         width += x;
 261         src_x -= x;
 262         x = 0;
 263     }
 264     if (y < 0)
 265     {
 266         height += y;
 267         src_y -= y;
 268         y = 0;
 269     }
 270     if (x + width > LCD_WIDTH)
 271         width = LCD_WIDTH - x;
 272     if (y + height > LCD_HEIGHT)
 273         height = LCD_HEIGHT - y;
 274
 275     src    += stride * src_y + src_x; /* move starting point */
 276     src_end = src + stride * height;
 277     dst     = _xlcd_rb->lcd_framebuffer + LCD_WIDTH * y + x;
 278
 279     do
 280     {
 281         const unsigned char *src_row = src;
 282         const unsigned char *row_end = src_row + width;
 283         fb_data *dst_row = dst;
 284
 285 #ifdef HAVE_LCD_COLOR
 286         do
 287             *dst_row++ = graylut[*src_row++];
 288         while (src_row < row_end);
 289 #endif
 290
 291         src +=  stride;
 292         dst += LCD_WIDTH;
 293     }
 294     while (src < src_end);
 295 }
 296
 297 /* Draw a full greyscale bitmap, canonical 8 bit format */
 298 void xlcd_gray_bitmap(const unsigned char *src, int x, int y, int width,
 299                       int height)
 300 {
 301     xlcd_gray_bitmap_part(src, 0, 0, width, x, y, width, height);
 302 }
 303
 304 #ifdef HAVE_LCD_COLOR
 305 /* Draw a partial colour bitmap, canonical 24 bit RGB format */
 306 void xlcd_color_bitmap_part(const unsigned char *src, int src_x, int src_y,
 307                             int stride, int x, int y, int width, int height)
 308 {
 309     const unsigned char *src_end;
 310     fb_data *dst;
 311
 312     /* nothing to draw? */
 313     if ((width <= 0) || (height <= 0) || (x >= LCD_WIDTH) || (y >= LCD_HEIGHT)
 314         || (x + width <= 0) || (y + height <= 0))
 315         return;
 316
 317     /* clipping */
 318     if (x < 0)
 319     {
 320         width += x;
 321         src_x -= x;
 322         x = 0;
 323     }
 324     if (y < 0)
 325     {
 326         height += y;
 327         src_y -= y;
 328         y = 0;
 329     }
 330     if (x + width > LCD_WIDTH)
 331         width = LCD_WIDTH - x;
 332     if (y + height > LCD_HEIGHT)
 333         height = LCD_HEIGHT - y;
 334
 335     src    += 3 * (stride * src_y + src_x); /* move starting point */
 336     src_end = src + 3 * stride * height;
 337     dst     = _xlcd_rb->lcd_framebuffer + LCD_WIDTH * y + x;
 338
 339     do
 340     {
 341         const unsigned char *src_row = src;
 342         const unsigned char *row_end = src_row + 3 * width;
 343         fb_data *dst_row = dst;
 344
 345         do
 346         {   /* only RGB565 and RGB565SWAPPED so far */
 347             unsigned red   = 31 * (*src_row++) + 127;
 348             unsigned green = 63 * (*src_row++) + 127;
 349             unsigned blue  = 31 * (*src_row++) + 127;
 350
 351             red   = (red + (red >> 8)) >> 8;     /* approx red /= 255: */
 352             green = (green + (green >> 8)) >> 8; /* approx green /= 255: */
 353             blue  = (blue + (blue >> 8)) >> 8;   /* approx blue /= 255: */
 354
 355 #if LCD_PIXELFORMAT == RGB565
 356             *dst_row++ = (red << 11) | (green << 5) | blue;
 357 #elif LCD_PIXELFORMAT == RGB565SWAPPED
 358             *dst_row++ = swap16((red << 11) | (green << 5) | blue);
 359 #endif
 360         }
 361         while (src_row < row_end);
 362
 363         src +=  3 * stride;
 364         dst += LCD_WIDTH;
 365     }
 366     while (src < src_end);
 367 }
 368
 369 /* Draw a full colour bitmap, canonical 24 bit RGB format */
 370 void xlcd_color_bitmap(const unsigned char *src, int x, int y, int width,
 371                        int height)
 372 {
 373     xlcd_color_bitmap_part(src, 0, 0, width, x, y, width, height);
 374 }
 375 #endif /* HAVE_LCD_COLOR */
 376
 377 #endif /* LCD_DEPTH >= 8 */
 378
 379 #endif /* HAVE_LCD_BITMAP */
 380