source: trunk/src/opengl/mesa/bitmap.c@ 3721

Last change on this file since 3721 was 3598, checked in by jeroen, 25 years ago

* empty log message *
File size: 6.2 KB
Line 
1/* $Id: bitmap.c,v 1.2 2000-05-23 20:40:24 jeroen 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#ifdef PC_HEADER
29#include "all.h"
30#else
31#include "glheader.h"
32#include "bitmap.h"
33#include "state.h"
34#include "context.h"
35#include "feedback.h"
36#include "image.h"
37#include "macros.h"
38#include "pb.h"
39#include "pixel.h"
40#include "types.h"
41#include "vbrender.h"
42#endif
43
44
45
46/*
47 * Render a bitmap.
48 */
49static void
50render_bitmap( GLcontext *ctx, GLint px, GLint py,
51 GLsizei width, GLsizei height,
52 const struct gl_pixelstore_attrib *unpack,
53 const GLubyte *bitmap )
54{
55 struct pixel_buffer *PB = ctx->PB;
56 GLint row, col;
57 GLdepth fragZ;
58
59 ASSERT(ctx->RenderMode == GL_RENDER);
60
61 if (!bitmap) {
62 return; /* NULL bitmap is legal, a no-op */
63 }
64
65 /* Set bitmap drawing color */
66 if (ctx->Visual->RGBAflag) {
67 GLint r, g, b, a;
68 r = (GLint) (ctx->Current.RasterColor[0] * 255.0F);
69 g = (GLint) (ctx->Current.RasterColor[1] * 255.0F);
70 b = (GLint) (ctx->Current.RasterColor[2] * 255.0F);
71 a = (GLint) (ctx->Current.RasterColor[3] * 255.0F);
72 PB_SET_COLOR( ctx, PB, r, g, b, a );
73 }
74 else {
75 PB_SET_INDEX( ctx, PB, ctx->Current.RasterIndex );
76 }
77
78 fragZ = (GLdepth) ( ctx->Current.RasterPos[2] * ctx->Visual->DepthMaxF);
79
80 for (row=0; row<height; row++) {
81 const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
82 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
83
84 if (unpack->LsbFirst) {
85 /* Lsb first */
86 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
87 for (col=0; col<width; col++) {
88 if (*src & mask) {
89 PB_WRITE_PIXEL( PB, px+col, py+row, fragZ );
90 }
91 if (mask == 128U) {
92 src++;
93 mask = 1U;
94 }
95 else {
96 mask = mask << 1;
97 }
98 }
99
100 PB_CHECK_FLUSH( ctx, PB );
101
102 /* get ready for next row */
103 if (mask != 1)
104 src++;
105 }
106 else {
107 /* Msb first */
108 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
109 for (col=0; col<width; col++) {
110 if (*src & mask) {
111 PB_WRITE_PIXEL( PB, px+col, py+row, fragZ );
112 }
113 if (mask == 1U) {
114 src++;
115 mask = 128U;
116 }
117 else {
118 mask = mask >> 1;
119 }
120 }
121
122 PB_CHECK_FLUSH( ctx, PB );
123
124 /* get ready for next row */
125 if (mask != 128)
126 src++;
127 }
128 }
129
130 gl_flush_pb(ctx);
131}
132
133
134
135/*
136 * Execute a glBitmap command.
137 */
138void
139_mesa_Bitmap( GLsizei width, GLsizei height,
140 GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
141 const GLubyte *bitmap )
142{
143 GET_CURRENT_CONTEXT(ctx);
144 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glBitmap");
145
146 /* Error checking */
147 if (width < 0 || height < 0) {
148 gl_error( ctx, GL_INVALID_VALUE, "glBitmap" );
149 return;
150 }
151
152 if (ctx->Current.RasterPosValid == GL_FALSE) {
153 return; /* do nothing */
154 }
155
156 if (ctx->RenderMode==GL_RENDER) {
157 if (bitmap) {
158 GLint x = (GLint) ( (ctx->Current.RasterPos[0] - xorig) + 0.0F );
159 GLint y = (GLint) ( (ctx->Current.RasterPos[1] - yorig) + 0.0F );
160 GLboolean completed = GL_FALSE;
161
162 if (ctx->NewState) {
163 gl_update_state(ctx);
164 gl_reduced_prim_change( ctx, GL_BITMAP );
165 }
166
167 if (ctx->PB->primitive!=GL_BITMAP) { /* A.W. 1.1.2000 */
168 gl_reduced_prim_change( ctx, GL_BITMAP );
169 }
170
171 if (ctx->Driver.Bitmap) {
172 /* let device driver try to render the bitmap */
173 completed = (*ctx->Driver.Bitmap)( ctx, x, y, width, height,
174 &ctx->Unpack, bitmap );
175 }
176 if (!completed) {
177 /* use generic function */
178 render_bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
179 }
180 }
181 }
182 else if (ctx->RenderMode==GL_FEEDBACK) {
183 GLfloat color[4], texcoord[4], invq;
184 color[0] = ctx->Current.RasterColor[0];
185 color[1] = ctx->Current.RasterColor[1];
186 color[2] = ctx->Current.RasterColor[2];
187 color[3] = ctx->Current.RasterColor[3];
188 if (ctx->Current.Texcoord[0][3] == 0.0)
189 invq = 1.0F;
190 else
191 invq = 1.0F / ctx->Current.RasterTexCoord[3];
192 texcoord[0] = ctx->Current.RasterTexCoord[0] * invq;
193 texcoord[1] = ctx->Current.RasterTexCoord[1] * invq;
194 texcoord[2] = ctx->Current.RasterTexCoord[2] * invq;
195 texcoord[3] = ctx->Current.RasterTexCoord[3];
196 FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
197 gl_feedback_vertex( ctx,
198 ctx->Current.RasterPos,
199 color, ctx->Current.RasterIndex, texcoord );
200 }
201 else if (ctx->RenderMode==GL_SELECT) {
202 /* Bitmaps don't generate selection hits. See appendix B of 1.1 spec. */
203 }
204
205 /* update raster position */
206 ctx->Current.RasterPos[0] += xmove;
207 ctx->Current.RasterPos[1] += ymove;
208}
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