src/gallium/winsys/xlib/xm_image.c

   1 /**************************************************************************
   2
   3 Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
   4 All Rights Reserved.
   5
   6 Permission is hereby granted, free of charge, to any person obtaining a
   7 copy of this software and associated documentation files (the
   8 "Software"), to deal in the Software without restriction, including
   9 without limitation the rights to use, copy, modify, merge, publish,
  10 distribute, sub license, and/or sell copies of the Software, and to
  11 permit persons to whom the Software is furnished to do so, subject to
  12 the following conditions:
  13
  14 The above copyright notice and this permission notice (including the
  15 next paragraph) shall be included in all copies or substantial portions
  16 of the Software.
  17
  18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21 IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  22 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26 **************************************************************************/
  27
  28 /*
  29  * Authors:
  30  *   Kevin E. Martin <kevin@precisioninsight.com>
  31  *   Brian Paul <brian@precisioninsight.com>
  32  */
  33
  34 #include <stdlib.h>
  35 #include <X11/Xmd.h>
  36
  37 #include "glxheader.h"
  38 #include "xmesaP.h"
  39
  40 #ifdef XFree86Server
  41
  42 #ifdef ROUNDUP
  43 #undef ROUNDUP
  44 #endif
  45
  46 #define ROUNDUP(nbytes, pad) ((((nbytes) + ((pad)-1)) / (pad)) * ((pad)>>3))
  47
  48 XMesaImage *XMesaCreateImage(int bitsPerPixel, int width, int height, char *data)
  49 {
  50     XMesaImage *image;
  51
  52     image = (XMesaImage *)xalloc(sizeof(XMesaImage));
  53
  54     if (image) {
  55         image->width = width;
  56         image->height = height;
  57         image->data = data;
  58         /* Always pad to 32 bits */
  59         image->bytes_per_line = ROUNDUP((bitsPerPixel * width), 32);
  60         image->bits_per_pixel = bitsPerPixel;
  61     }
  62
  63     return image;
  64 }
  65
  66 void XMesaDestroyImage(XMesaImage *image)
  67 {
  68     if (image->data)
  69         free(image->data);
  70     xfree(image);
  71 }
  72
  73 unsigned long XMesaGetPixel(XMesaImage *image, int x, int y)
  74 {
  75     CARD8  *row = (CARD8 *)(image->data + y*image->bytes_per_line);
  76     CARD8  *i8;
  77     CARD16 *i16;
  78     CARD32 *i32;
  79     switch (image->bits_per_pixel) {
  80     case 8:
  81         i8 = (CARD8 *)row;
  82         return i8[x];
  83         break;
  84     case 15:
  85     case 16:
  86         i16 = (CARD16 *)row;
  87         return i16[x];
  88         break;
  89     case 24: /* WARNING: architecture specific code */
  90         i8 = (CARD8 *)row;
  91         return (((CARD32)i8[x*3]) |
  92                 (((CARD32)i8[x*3+1])<<8) |
  93                 (((CARD32)i8[x*3+2])<<16));
  94         break;
  95     case 32:
  96         i32 = (CARD32 *)row;
  97         return i32[x];
  98         break;
  99     }
 100     return 0;
 101 }
 102
 103 #ifndef XMESA_USE_PUTPIXEL_MACRO
 104 void XMesaPutPixel(XMesaImage *image, int x, int y, unsigned long pixel)
 105 {
 106     CARD8  *row = (CARD8 *)(image->data + y*image->bytes_per_line);
 107     CARD8  *i8;
 108     CARD16 *i16;
 109     CARD32 *i32;
 110     switch (image->bits_per_pixel) {
 111     case 8:
 112         i8 = (CARD8 *)row;
 113         i8[x] = (CARD8)pixel;
 114         break;
 115     case 15:
 116     case 16:
 117         i16 = (CARD16 *)row;
 118         i16[x] = (CARD16)pixel;
 119         break;
 120     case 24: /* WARNING: architecture specific code */
 121         i8 = (CARD8 *)__row;
 122         i8[x*3]   = (CARD8)(p);
 123         i8[x*3+1] = (CARD8)(p>>8);
 124         i8[x*3+2] = (CARD8)(p>>16);
 125     case 32:
 126         i32 = (CARD32 *)row;
 127         i32[x] = (CARD32)pixel;
 128         break;
 129     }
 130 }
 131 #endif
 132
 133 #endif /* XFree86Server */