src/mesa/swrast/s_bitmap.c

   1 /* $Id: s_bitmap.c,v 1.1 2000/10/31 18:00:04 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_fog.h"
  34 #include "s_pb.h"
  35
  36
  37
  38 /*
  39  * Render a bitmap.
  40  */
  41 void
  42 _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
  43                 GLsizei width, GLsizei height,
  44                 const struct gl_pixelstore_attrib *unpack,
  45                 const GLubyte *bitmap )
  46 {
  47    struct pixel_buffer *PB = ctx->PB;
  48    GLint row, col;
  49    GLdepth fragZ;
  50    GLfixed fogCoord;
  51
  52    ASSERT(ctx->RenderMode == GL_RENDER);
  53    ASSERT(bitmap);
  54
  55    if (ctx->PB->primitive != GL_BITMAP) {
  56       gl_flush_pb( ctx );
  57       ctx->PB->primitive = GL_BITMAP;
  58    }
  59
  60    /* Set bitmap drawing color */
  61    if (ctx->Visual.RGBAflag) {
  62       GLint r, g, b, a;
  63       r = (GLint) (ctx->Current.RasterColor[0] * CHAN_MAXF);
  64       g = (GLint) (ctx->Current.RasterColor[1] * CHAN_MAXF);
  65       b = (GLint) (ctx->Current.RasterColor[2] * CHAN_MAXF);
  66       a = (GLint) (ctx->Current.RasterColor[3] * CHAN_MAXF);
  67       PB_SET_COLOR( PB, r, g, b, a );
  68    }
  69    else {
  70       PB_SET_INDEX( PB, ctx->Current.RasterIndex );
  71    }
  72
  73    fragZ = (GLdepth) ( ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
  74
  75    _mesa_win_fog_coords_from_z( ctx, 1, &fragZ, &fogCoord );
  76
  77    for (row=0; row<height; row++) {
  78       const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
  79                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
  80
  81       if (unpack->LsbFirst) {
  82          /* Lsb first */
  83          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
  84          for (col=0; col<width; col++) {
  85             if (*src & mask) {
  86                PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fogCoord );
  87             }
  88             if (mask == 128U) {
  89                src++;
  90                mask = 1U;
  91             }
  92             else {
  93                mask = mask << 1;
  94             }
  95          }
  96
  97          PB_CHECK_FLUSH( ctx, PB );
  98
  99          /* get ready for next row */
 100          if (mask != 1)
 101             src++;
 102       }
 103       else {
 104          /* Msb first */
 105          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 106          for (col=0; col<width; col++) {
 107             if (*src & mask) {
 108                PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fogCoord );
 109             }
 110             if (mask == 1U) {
 111                src++;
 112                mask = 128U;
 113             }
 114             else {
 115                mask = mask >> 1;
 116             }
 117          }
 118
 119          PB_CHECK_FLUSH( ctx, PB );
 120
 121          /* get ready for next row */
 122          if (mask != 128)
 123             src++;
 124       }
 125    }
 126
 127    gl_flush_pb(ctx);
 128 }
 129
 130
 131