src/mesa/swrast/s_bitmap.c

   1 /* $Id: s_bitmap.c,v 1.13 2001/12/14 02:50:57 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  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    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  49    struct pixel_buffer *PB = swrast->PB;
  50    GLint row, col;
  51    GLdepth fragZ;
  52    GLfloat fog;
  53
  54    ASSERT(ctx->RenderMode == GL_RENDER);
  55    ASSERT(bitmap);
  56
  57    RENDER_START(swrast,ctx);
  58
  59    if (SWRAST_CONTEXT(ctx)->NewState)
  60       _swrast_validate_derived( ctx );
  61
  62    /* Set bitmap drawing color */
  63    if (ctx->Visual.rgbMode) {
  64       GLint r, g, b, a;
  65       r = (GLint) (ctx->Current.RasterColor[0] * CHAN_MAXF);
  66       g = (GLint) (ctx->Current.RasterColor[1] * CHAN_MAXF);
  67       b = (GLint) (ctx->Current.RasterColor[2] * CHAN_MAXF);
  68       a = (GLint) (ctx->Current.RasterColor[3] * CHAN_MAXF);
  69       PB_SET_COLOR( PB, r, g, b, a );
  70    }
  71    else {
  72       PB_SET_INDEX( PB, ctx->Current.RasterIndex );
  73    }
  74
  75    fragZ = (GLdepth) ( ctx->Current.RasterPos[2] * ctx->DepthMaxF);
  76
  77    if (ctx->Fog.Enabled) {
  78       if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
  79          fog = _mesa_z_to_fogfactor(ctx, ctx->Current.Attrib[VERT_ATTRIB_FOG][0]);
  80       else
  81          fog = _mesa_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
  82    }
  83    else {
  84       fog = 0.0;
  85    }
  86
  87    for (row=0; row<height; row++) {
  88       const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
  89                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
  90
  91       if (unpack->LsbFirst) {
  92          /* Lsb first */
  93          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
  94          for (col=0; col<width; col++) {
  95             if (*src & mask) {
  96                PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fog );
  97             }
  98             if (mask == 128U) {
  99                src++;
 100                mask = 1U;
 101             }
 102             else {
 103                mask = mask << 1;
 104             }
 105          }
 106
 107          PB_CHECK_FLUSH( ctx, PB );
 108
 109          /* get ready for next row */
 110          if (mask != 1)
 111             src++;
 112       }
 113       else {
 114          /* Msb first */
 115          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 116          for (col=0; col<width; col++) {
 117             if (*src & mask) {
 118                PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fog );
 119             }
 120             if (mask == 1U) {
 121                src++;
 122                mask = 128U;
 123             }
 124             else {
 125                mask = mask >> 1;
 126             }
 127          }
 128
 129          PB_CHECK_FLUSH( ctx, PB );
 130
 131          /* get ready for next row */
 132          if (mask != 128)
 133             src++;
 134       }
 135    }
 136
 137    _mesa_flush_pb(ctx);
 138
 139    RENDER_FINISH(swrast,ctx);
 140 }