src/mesa/swrast/s_bitmap.c

   1 /* $Id: s_bitmap.c,v 1.3 2000/11/16 21:05:41 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #include "glheader.h"
  29 #include "image.h"
  30 #include "macros.h"
  31 #include "pixel.h"
  32
  33 #include "s_context.h"
  34 #include "s_fog.h"
  35 #include "s_pb.h"
  36
  37
  38
  39 /*
  40  * Render a bitmap.
  41  */
  42 void
  43 _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
  44                 GLsizei width, GLsizei height,
  45                 const struct gl_pixelstore_attrib *unpack,
  46                 const GLubyte *bitmap )
  47 {
  48    struct pixel_buffer *PB = SWRAST_CONTEXT(ctx)->PB;
  49    GLint row, col;
  50    GLdepth fragZ;
  51    GLfixed fogCoord;
  52
  53    ASSERT(ctx->RenderMode == GL_RENDER);
  54    ASSERT(bitmap);
  55
  56    if (SWRAST_CONTEXT(ctx)->NewState)
  57       _swrast_validate_derived( ctx );
  58
  59    /* Set bitmap drawing color */
  60    if (ctx->Visual.RGBAflag) {
  61       GLint r, g, b, a;
  62       r = (GLint) (ctx->Current.RasterColor[0] * CHAN_MAXF);
  63       g = (GLint) (ctx->Current.RasterColor[1] * CHAN_MAXF);
  64       b = (GLint) (ctx->Current.RasterColor[2] * CHAN_MAXF);
  65       a = (GLint) (ctx->Current.RasterColor[3] * CHAN_MAXF);
  66       PB_SET_COLOR( PB, r, g, b, a );
  67    }
  68    else {
  69       PB_SET_INDEX( PB, ctx->Current.RasterIndex );
  70    }
  71
  72    fragZ = (GLdepth) ( ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
  73
  74    _mesa_win_fog_coords_from_z( ctx, 1, &fragZ, &fogCoord );
  75
  76    for (row=0; row<height; row++) {
  77       const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
  78                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
  79
  80       if (unpack->LsbFirst) {
  81          /* Lsb first */
  82          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
  83          for (col=0; col<width; col++) {
  84             if (*src & mask) {
  85                PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fogCoord );
  86             }
  87             if (mask == 128U) {
  88                src++;
  89                mask = 1U;
  90             }
  91             else {
  92                mask = mask << 1;
  93             }
  94          }
  95
  96          PB_CHECK_FLUSH( ctx, PB );
  97
  98          /* get ready for next row */
  99          if (mask != 1)
 100             src++;
 101       }
 102       else {
 103          /* Msb first */
 104          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 105          for (col=0; col<width; col++) {
 106             if (*src & mask) {
 107                PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fogCoord );
 108             }
 109             if (mask == 1U) {
 110                src++;
 111                mask = 128U;
 112             }
 113             else {
 114                mask = mask >> 1;
 115             }
 116          }
 117
 118          PB_CHECK_FLUSH( ctx, PB );
 119
 120          /* get ready for next row */
 121          if (mask != 128)
 122             src++;
 123       }
 124    }
 125
 126    gl_flush_pb(ctx);
 127 }
 128
 129
 130