s_bitmap.c revision b6bcae5698df88f7730d40004ce7ce0462e97a20 
1/* $Id: s_bitmap.c,v 1.4 2001/01/23 23:39:37 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 */
42void
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.rgbMode) {
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->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
131