source: trunk/src/opengl/mesa/bitmap.c@ 2999

Last change on this file since 2999 was 2938, checked in by sandervl, 25 years ago

created
File size: 6.0 KB
Line 
1/* $Id: bitmap.c,v 1.1 2000-02-29 00:49:59 sandervl Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version: 3.1
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
29
30
31#ifdef PC_HEADER
32#include "all.h"
33#else
34#ifndef XFree86Server
35#include <assert.h>
36#include <stdlib.h>
37#include <stdio.h>
38#include <string.h>
39#else
40#include "GL/xf86glx.h"
41#endif
42#include "bitmap.h"
43#include "context.h"
44#include "feedback.h"
45#include "image.h"
46#include "macros.h"
47#include "pb.h"
48#include "pixel.h"
49#include "types.h"
50#include "vbrender.h"
51#endif
52
53
54
55/*
56 * Render bitmap data.
57 */
58static void render_bitmap( GLcontext *ctx, GLint px, GLint py,
59 GLsizei width, GLsizei height,
60 const struct gl_pixelstore_attrib *unpack,
61 const GLubyte *bitmap )
62{
63 struct pixel_buffer *PB = ctx->PB;
64 GLint row, col;
65 GLint pz;
66
67 ASSERT(ctx->RenderMode == GL_RENDER);
68
69 if (!bitmap) {
70 return; /* NULL bitmap is legal, a no-op */
71 }
72
73 if (ctx->NewState) {
74 gl_update_state(ctx);
75 gl_reduced_prim_change( ctx, GL_BITMAP );
76 }
77
78 /* Set bitmap drawing color */
79 if (ctx->Visual->RGBAflag) {
80 GLint r, g, b, a;
81 r = (GLint) (ctx->Current.RasterColor[0] * 255.0F);
82 g = (GLint) (ctx->Current.RasterColor[1] * 255.0F);
83 b = (GLint) (ctx->Current.RasterColor[2] * 255.0F);
84 a = (GLint) (ctx->Current.RasterColor[3] * 255.0F);
85 PB_SET_COLOR( ctx, PB, r, g, b, a );
86 }
87 else {
88 PB_SET_INDEX( ctx, PB, ctx->Current.RasterIndex );
89 }
90
91 pz = (GLint) ( ctx->Current.RasterPos[2] * DEPTH_SCALE );
92
93 for (row=0; row<height; row++) {
94 const GLubyte *src = (const GLubyte *) gl_pixel_addr_in_image( unpack,
95 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
96
97 if (unpack->LsbFirst) {
98 /* Lsb first */
99 GLubyte bitmask = 1;
100 for (col=0; col<width; col++) {
101 if (*src & bitmask) {
102 PB_WRITE_PIXEL( PB, px+col, py+row, pz );
103 }
104 bitmask = bitmask << 1;
105 if (bitmask == 0U) {
106 src++;
107 bitmask = 1U;
108 }
109 }
110
111 PB_CHECK_FLUSH( ctx, PB );
112
113 /* get ready for next row */
114 if (bitmask != 1)
115 src++;
116 }
117 else {
118 /* Msb first */
119 GLubyte bitmask = 128;
120 for (col=0; col<width; col++) {
121 if (*src & bitmask) {
122 PB_WRITE_PIXEL( PB, px+col, py+row, pz );
123 }
124 bitmask = bitmask >> 1;
125 if (bitmask == 0U) {
126 src++;
127 bitmask = 128U;
128 }
129 }
130
131 PB_CHECK_FLUSH( ctx, PB );
132
133 /* get ready for next row */
134 if (bitmask!=128)
135 src++;
136 }
137 }
138
139 gl_flush_pb(ctx);
140}
141
142
143
144/*
145 * Execute a glBitmap command.
146 */
147void gl_Bitmap( GLcontext *ctx,
148 GLsizei width, GLsizei height,
149 GLfloat xorig, GLfloat yorig,
150 GLfloat xmove, GLfloat ymove,
151 const GLubyte *bitmap,
152 const struct gl_pixelstore_attrib *packing )
153{
154 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glBitmap");
155
156 /* Error checking */
157 if (width < 0 || height < 0) {
158 gl_error( ctx, GL_INVALID_VALUE, "glBitmap" );
159 return;
160 }
161
162 if (ctx->Current.RasterPosValid == GL_FALSE) {
163 return; /* do nothing */
164 }
165
166 if (ctx->RenderMode==GL_RENDER) {
167 GLint x = (GLint) ( (ctx->Current.RasterPos[0] - xorig) + 0.0F );
168 GLint y = (GLint) ( (ctx->Current.RasterPos[1] - yorig) + 0.0F );
169 GLboolean completed = GL_FALSE;
170 if (ctx->Driver.Bitmap) {
171 /* let device driver try to render the bitmap */
172 completed = (*ctx->Driver.Bitmap)( ctx, x, y, width, height,
173 packing, bitmap );
174 }
175 if (!completed) {
176 /* use generic function */
177 render_bitmap( ctx, x, y, width, height, packing, bitmap );
178 }
179 }
180 else if (ctx->RenderMode==GL_FEEDBACK) {
181 GLfloat color[4], texcoord[4], invq;
182 color[0] = ctx->Current.RasterColor[0];
183 color[1] = ctx->Current.RasterColor[1];
184 color[2] = ctx->Current.RasterColor[2];
185 color[3] = ctx->Current.RasterColor[3];
186 if (ctx->Current.Texcoord[0][3] == 0.0)
187 invq = 1.0F;
188 else
189 invq = 1.0F / ctx->Current.RasterTexCoord[3];
190 texcoord[0] = ctx->Current.RasterTexCoord[0] * invq;
191 texcoord[1] = ctx->Current.RasterTexCoord[1] * invq;
192 texcoord[2] = ctx->Current.RasterTexCoord[2] * invq;
193 texcoord[3] = ctx->Current.RasterTexCoord[3];
194 FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
195 gl_feedback_vertex( ctx,
196 ctx->Current.RasterPos,
197 color, ctx->Current.RasterIndex, texcoord );
198 }
199 else if (ctx->RenderMode==GL_SELECT) {
200 /* Bitmaps don't generate selection hits. See appendix B of 1.1 spec. */
201 }
202
203 /* update raster position */
204 ctx->Current.RasterPos[0] += xmove;
205 ctx->Current.RasterPos[1] += ymove;
206}
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