hw/display/sm501_template.h

   1 /*
   2  * Pixel drawing function templates for QEMU SM501 Device
   3  *
   4  * Copyright (c) 2008 Shin-ichiro KAWASAKI
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #if DEPTH == 8
  26 #define BPP 1
  27 #define PIXEL_TYPE uint8_t
  28 #elif DEPTH == 15 || DEPTH == 16
  29 #define BPP 2
  30 #define PIXEL_TYPE uint16_t
  31 #elif DEPTH == 32
  32 #define BPP 4
  33 #define PIXEL_TYPE uint32_t
  34 #else
  35 #error unsupport depth
  36 #endif
  37
  38 #ifdef BGR_FORMAT
  39 #define PIXEL_NAME glue(DEPTH, bgr)
  40 #else
  41 #define PIXEL_NAME DEPTH
  42 #endif /* BGR_FORMAT */
  43
  44
  45 static void glue(draw_line8_, PIXEL_NAME)(
  46                  uint8_t *d, const uint8_t *s, int width, const uint32_t *pal)
  47 {
  48     uint8_t v, r, g, b;
  49     do {
  50         v = ldub_p(s);
  51         r = (pal[v] >> 16) & 0xff;
  52         g = (pal[v] >>  8) & 0xff;
  53         b = (pal[v] >>  0) & 0xff;
  54         *(PIXEL_TYPE *)d = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
  55         s++;
  56         d += BPP;
  57     } while (--width != 0);
  58 }
  59
  60 static void glue(draw_line16_, PIXEL_NAME)(
  61                  uint8_t *d, const uint8_t *s, int width, const uint32_t *pal)
  62 {
  63     uint16_t rgb565;
  64     uint8_t r, g, b;
  65
  66     do {
  67         rgb565 = lduw_le_p(s);
  68         r = (rgb565 >> 8) & 0xf8;
  69         g = (rgb565 >> 3) & 0xfc;
  70         b = (rgb565 << 3) & 0xf8;
  71         *(PIXEL_TYPE *)d = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
  72         s += 2;
  73         d += BPP;
  74     } while (--width != 0);
  75 }
  76
  77 static void glue(draw_line32_, PIXEL_NAME)(
  78                  uint8_t *d, const uint8_t *s, int width, const uint32_t *pal)
  79 {
  80     uint8_t r, g, b;
  81
  82     do {
  83         r = s[2];
  84         g = s[1];
  85         b = s[0];
  86         *(PIXEL_TYPE *)d = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
  87         s += 4;
  88         d += BPP;
  89     } while (--width != 0);
  90 }
  91
  92 /**
  93  * Draw hardware cursor image on the given line.
  94  */
  95 static void glue(draw_hwc_line_, PIXEL_NAME)(uint8_t *d, const uint8_t *s,
  96                  int width, const uint8_t *palette, int c_x, int c_y)
  97 {
  98     int i;
  99     uint8_t r, g, b, v, bitset = 0;
 100
 101     /* get cursor position */
 102     assert(0 <= c_y && c_y < SM501_HWC_HEIGHT);
 103     s += SM501_HWC_WIDTH * c_y / 4;  /* 4 pixels per byte */
 104     d += c_x * BPP;
 105
 106     for (i = 0; i < SM501_HWC_WIDTH && c_x + i < width; i++) {
 107         /* get pixel value */
 108         if (i % 4 == 0) {
 109             bitset = ldub_p(s);
 110             s++;
 111         }
 112         v = bitset & 3;
 113         bitset >>= 2;
 114
 115         /* write pixel */
 116         if (v) {
 117             v--;
 118             r = palette[v * 3 + 0];
 119             g = palette[v * 3 + 1];
 120             b = palette[v * 3 + 2];
 121             *(PIXEL_TYPE *)d = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
 122         }
 123         d += BPP;
 124     }
 125 }
 126
 127 #undef DEPTH
 128 #undef BPP
 129 #undef PIXEL_TYPE
 130 #undef PIXEL_NAME
 131 #undef BGR_FORMAT