hw/display/milkymist-vgafb_template.h

   1 /*
   2  *  QEMU model of the Milkymist VGA framebuffer.
   3  *
   4  *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #if BITS == 8
  22 #define COPY_PIXEL(to, r, g, b)                    \
  23     do {                                           \
  24         *to = rgb_to_pixel8(r, g, b);              \
  25         to += 1;                                   \
  26     } while (0)
  27 #elif BITS == 15
  28 #define COPY_PIXEL(to, r, g, b)                    \
  29     do {                                           \
  30         *(uint16_t *)to = rgb_to_pixel15(r, g, b); \
  31         to += 2;                                   \
  32     } while (0)
  33 #elif BITS == 16
  34 #define COPY_PIXEL(to, r, g, b)                    \
  35     do {                                           \
  36         *(uint16_t *)to = rgb_to_pixel16(r, g, b); \
  37         to += 2;                                   \
  38     } while (0)
  39 #elif BITS == 24
  40 #define COPY_PIXEL(to, r, g, b)                    \
  41     do {                                           \
  42         uint32_t tmp = rgb_to_pixel24(r, g, b);    \
  43         *(to++) =         tmp & 0xff;              \
  44         *(to++) =  (tmp >> 8) & 0xff;              \
  45         *(to++) = (tmp >> 16) & 0xff;              \
  46     } while (0)
  47 #elif BITS == 32
  48 #define COPY_PIXEL(to, r, g, b)                    \
  49     do {                                           \
  50         *(uint32_t *)to = rgb_to_pixel32(r, g, b); \
  51         to += 4;                                   \
  52     } while (0)
  53 #else
  54 #error unknown bit depth
  55 #endif
  56
  57 static void glue(draw_line_, BITS)(void *opaque, uint8_t *d, const uint8_t *s,
  58         int width, int deststep)
  59 {
  60     uint16_t rgb565;
  61     uint8_t r, g, b;
  62
  63     while (width--) {
  64         rgb565 = lduw_be_p(s);
  65         r = ((rgb565 >> 11) & 0x1f) << 3;
  66         g = ((rgb565 >>  5) & 0x3f) << 2;
  67         b = ((rgb565 >>  0) & 0x1f) << 3;
  68         COPY_PIXEL(d, r, g, b);
  69         s += 2;
  70     }
  71 }
  72
  73 #undef BITS
  74 #undef COPY_PIXEL