dlls/ddraw/convert.c

   1 #include "ddraw_private.h"
   2 #include "debugtools.h"
   3
   4 DEFAULT_DEBUG_CHANNEL(ddraw);
   5
   6 /* *************************************
   7       16 / 15 bpp to palettized 8 bpp
   8    ************************************* */
   9 static void pixel_convert_16_to_8(void *src, void *dst, DWORD width, DWORD height, LONG pitch, IDirectDrawPaletteImpl* palette) {
  10     unsigned char  *c_src = (unsigned char  *) src;
  11     unsigned short *c_dst = (unsigned short *) dst;
  12     int y;
  13
  14     if (palette != NULL) {
  15         const unsigned short * pal = (unsigned short *) palette->screen_palents;
  16
  17         for (y = height; y--; ) {
  18 #if defined(__i386__) && defined(__GNUC__)
  19             /* gcc generates slightly inefficient code for the the copy/lookup,
  20              * it generates one excess memory access (to pal) per pixel. Since
  21              * we know that pal is not modified by the memory write we can
  22              * put it into a register and reduce the number of memory accesses
  23              * from 4 to 3 pp. There are two xor eax,eax to avoid pipeline
  24              * stalls. (This is not guaranteed to be the fastest method.)
  25              */
  26             __asm__ __volatile__(
  27             "xor %%eax,%%eax\n"
  28             "1:\n"
  29             "    lodsb\n"
  30             "    movw (%%edx,%%eax,2),%%ax\n"
  31             "    stosw\n"
  32             "      xor %%eax,%%eax\n"
  33             "    loop 1b\n"
  34             : "=S" (c_src), "=D" (c_dst)
  35             : "S" (c_src), "D" (c_dst) , "c" (width), "d" (pal)
  36             : "eax", "cc", "memory"
  37             );
  38             c_src+=(pitch-width);
  39 #else
  40             unsigned char * srclineend = c_src+width;
  41             while (c_src < srclineend)
  42                 *c_dst++ = pal[*c_src++];
  43             c_src+=(pitch-width);
  44 #endif
  45         }
  46     } else {
  47         WARN("No palette set...\n");
  48         memset(dst, 0, width * height * 2);
  49     }
  50 }
  51 static void palette_convert_16_to_8(
  52         LPPALETTEENTRY palent, void *screen_palette, DWORD start, DWORD count
  53 ) {
  54     int i;
  55     unsigned short *pal = (unsigned short *) screen_palette;
  56
  57     for (i = 0; i < count; i++)
  58         pal[start + i] = (((((unsigned short) palent[i].peRed) & 0xF8) << 8) |
  59                           ((((unsigned short) palent[i].peBlue) & 0xF8) >> 3) |
  60                           ((((unsigned short) palent[i].peGreen) & 0xFC) << 3));
  61 }
  62
  63 static void palette_convert_15_to_8(
  64         LPPALETTEENTRY palent, void *screen_palette, DWORD start, DWORD count
  65 ) {
  66     int i;
  67     unsigned short *pal = (unsigned short *) screen_palette;
  68
  69     for (i = 0; i < count; i++)
  70         pal[start + i] = (((((unsigned short) palent[i].peRed) & 0xF8) << 7) |
  71                           ((((unsigned short) palent[i].peBlue) & 0xF8) >> 3) |
  72                           ((((unsigned short) palent[i].peGreen) & 0xF8) << 2));
  73 }
  74
  75 /* *************************************
  76       24 to palettized 8 bpp
  77    ************************************* */
  78 static void pixel_convert_24_to_8(
  79         void *src, void *dst, DWORD width, DWORD height, LONG pitch,
  80         IDirectDrawPaletteImpl* palette
  81 ) {
  82     unsigned char  *c_src = (unsigned char  *) src;
  83     unsigned char *c_dst = (unsigned char *) dst;
  84     int y;
  85
  86     if (palette != NULL) {
  87         const unsigned int *pal = (unsigned int *) palette->screen_palents;
  88
  89         for (y = height; y--; ) {
  90             unsigned char * srclineend = c_src+width;
  91             while (c_src < srclineend ) {
  92                 register long pixel = pal[*c_src++];
  93                 *c_dst++ = pixel;
  94                 *c_dst++ = pixel>>8;
  95                 *c_dst++ = pixel>>16;
  96             }
  97             c_src+=(pitch-width);
  98         }
  99     } else {
 100         WARN("No palette set...\n");
 101         memset(dst, 0, width * height * 4);
 102     }
 103 }
 104
 105 /* *************************************
 106       32 bpp to palettized 8 bpp
 107    ************************************* */
 108 static void pixel_convert_32_to_8(
 109         void *src, void *dst, DWORD width, DWORD height, LONG pitch,
 110         IDirectDrawPaletteImpl* palette
 111 ) {
 112     unsigned char  *c_src = (unsigned char  *) src;
 113     unsigned int *c_dst = (unsigned int *) dst;
 114     int y;
 115
 116     if (palette != NULL) {
 117         const unsigned int *pal = (unsigned int *) palette->screen_palents;
 118
 119         for (y = height; y--; ) {
 120 #if defined(__i386__) && defined(__GNUC__)
 121             /* See comment in pixel_convert_16_to_8 */
 122             __asm__ __volatile__(
 123             "xor %%eax,%%eax\n"
 124             "1:\n"
 125             "    lodsb\n"
 126             "    movl (%%edx,%%eax,4),%%eax\n"
 127             "    stosl\n"
 128             "      xor %%eax,%%eax\n"
 129             "    loop 1b\n"
 130             : "=S" (c_src), "=D" (c_dst)
 131             : "S" (c_src), "D" (c_dst) , "c" (width), "d" (pal)
 132             : "eax", "cc", "memory"
 133             );
 134             c_src+=(pitch-width);
 135 #else
 136             unsigned char * srclineend = c_src+width;
 137             while (c_src < srclineend )
 138                 *c_dst++ = pal[*c_src++];
 139             c_src+=(pitch-width);
 140 #endif
 141         }
 142     } else {
 143         WARN("No palette set...\n");
 144         memset(dst, 0, width * height * 4);
 145     }
 146 }
 147
 148 static void palette_convert_24_to_8(
 149         LPPALETTEENTRY palent, void *screen_palette, DWORD start, DWORD count
 150 ) {
 151     int i;
 152     unsigned int *pal = (unsigned int *) screen_palette;
 153
 154     for (i = 0; i < count; i++)
 155         pal[start + i] = ((((unsigned int) palent[i].peRed) << 16) |
 156                           (((unsigned int) palent[i].peGreen) << 8) |
 157                            ((unsigned int) palent[i].peBlue));
 158 }
 159
 160 /* *************************************
 161       32 bpp to 16 bpp
 162    ************************************* */
 163 static void pixel_convert_32_to_16(
 164         void *src, void *dst, DWORD width, DWORD height, LONG pitch,
 165         IDirectDrawPaletteImpl* palette
 166 ) {
 167     unsigned short *c_src = (unsigned short *) src;
 168     unsigned int *c_dst = (unsigned int *) dst;
 169     int y;
 170
 171     for (y = height; y--; ) {
 172         unsigned short * srclineend = c_src+width;
 173         while (c_src < srclineend ) {
 174             *c_dst++ = (((*c_src & 0xF800) << 8) |
 175                         ((*c_src & 0x07E0) << 5) |
 176                         ((*c_src & 0x001F) << 3));
 177             c_src++;
 178         }
 179         c_src+=((pitch/2)-width);
 180     }
 181 }
 182
 183 Convert ModeEmulations[5] = {
 184   { { 32, 24, 0x00FF0000, 0x0000FF00, 0x000000FF }, {  8,  8, 0x00, 0x00, 0x00 }, { pixel_convert_32_to_8,  palette_convert_24_to_8 } },
 185   { { 32, 24, 0x00FF0000, 0x0000FF00, 0x000000FF }, {  16, 16, 0xF800, 0x07E0, 0x001F }, { pixel_convert_32_to_16, NULL } },
 186   { { 24, 24,   0xFF0000,   0x00FF00,   0x0000FF }, {  8,  8, 0x00, 0x00, 0x00 }, { pixel_convert_24_to_8,  palette_convert_24_to_8 } },
 187   { { 16, 16,     0xF800,     0x07E0,     0x001F }, {  8,  8, 0x00, 0x00, 0x00 }, { pixel_convert_16_to_8,  palette_convert_16_to_8 } },
 188   { { 16, 15,     0x7C00,     0x03E0,     0x001F }, {  8,  8, 0x00, 0x00, 0x00 }, { pixel_convert_16_to_8,  palette_convert_15_to_8 } },
 189 };