1525908b2336947d83773e4bc665ada833795352
1 /* $Id: s_bitmap.c,v 1.18 2002/04/19 14:05:50 brianp Exp $ */
4 * Mesa 3-D graphics library
7 * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
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:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
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.
28 * \file swrast/s_bitmap.c
29 * \brief glBitmap rendering.
39 #include "s_context.h"
48 _swrast_Bitmap( GLcontext
*ctx
, GLint px
, GLint py
,
49 GLsizei width
, GLsizei height
,
50 const struct gl_pixelstore_attrib
*unpack
,
51 const GLubyte
*bitmap
)
53 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
56 struct sw_span
*span
= swrast
->span
;
58 ASSERT(ctx
->RenderMode
== GL_RENDER
);
61 RENDER_START(swrast
,ctx
);
63 if (SWRAST_CONTEXT(ctx
)->NewState
)
64 _swrast_validate_derived( ctx
);
66 INIT_SPAN(span
, GL_BITMAP
, width
, 0, SPAN_XY
);
68 if (ctx
->Visual
.rgbMode
) {
69 span
->interpMask
|= SPAN_RGBA
;
70 span
->red
= FloatToFixed(ctx
->Current
.RasterColor
[0] * CHAN_MAXF
);
71 span
->green
= FloatToFixed(ctx
->Current
.RasterColor
[1] * CHAN_MAXF
);
72 span
->blue
= FloatToFixed(ctx
->Current
.RasterColor
[2] * CHAN_MAXF
);
73 span
->alpha
= FloatToFixed(ctx
->Current
.RasterColor
[3] * CHAN_MAXF
);
74 span
->redStep
= span
->greenStep
= span
->blueStep
= span
->alphaStep
= 0;
77 span
->interpMask
|= SPAN_INDEX
;
78 span
->index
= ChanToFixed(ctx
->Current
.RasterIndex
);
83 _mesa_span_default_z(ctx
, span
);
85 _mesa_span_default_fog(ctx
, span
);
87 for (row
= 0; row
< height
; row
++, span
->y
++) {
88 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address( unpack
,
89 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, 0, row
, 0 );
91 if (unpack
->LsbFirst
) {
93 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
94 for (col
= 0; col
< width
; col
++) {
96 span
->xArray
[count
] = px
+ col
;
97 span
->yArray
[count
] = py
+ row
;
109 /* get ready for next row */
115 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
116 for (col
= 0; col
< width
; col
++) {
118 span
->xArray
[count
] = px
+ col
;
119 span
->yArray
[count
] = py
+ row
;
131 /* get ready for next row */
136 if (count
+ width
>= MAX_WIDTH
|| row
+ 1 == height
) {
139 if (ctx
->Visual
.rgbMode
)
140 _mesa_write_rgba_span(ctx
, span
);
142 _mesa_write_index_span(ctx
, span
);
148 RENDER_FINISH(swrast
,ctx
);
154 * XXX this is another way to implement Bitmap. Use horizontal runs of
155 * fragments, initializing the mask array to indicate which fragmens to
160 _swrast_Bitmap( GLcontext
*ctx
, GLint px
, GLint py
,
161 GLsizei width
, GLsizei height
,
162 const struct gl_pixelstore_attrib
*unpack
,
163 const GLubyte
*bitmap
)
165 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
167 struct sw_span
*span
= swrast
->span
;
169 ASSERT(ctx
->RenderMode
== GL_RENDER
);
172 RENDER_START(swrast
,ctx
);
174 if (SWRAST_CONTEXT(ctx
)->NewState
)
175 _swrast_validate_derived( ctx
);
177 INIT_SPAN(span
, GL_BITMAP
, width
, 0, SPAN_MASK
);
178 /*span->arrayMask |= SPAN_MASK;*/ /* we'll init span->mask[] */
181 /*span->end = width;*/
182 if (ctx
->Visual
.rgbMode
) {
183 span
->interpMask
|= SPAN_RGBA
;
184 span
->red
= FloatToFixed(ctx
->Current
.RasterColor
[0] * CHAN_MAXF
);
185 span
->green
= FloatToFixed(ctx
->Current
.RasterColor
[1] * CHAN_MAXF
);
186 span
->blue
= FloatToFixed(ctx
->Current
.RasterColor
[2] * CHAN_MAXF
);
187 span
->alpha
= FloatToFixed(ctx
->Current
.RasterColor
[3] * CHAN_MAXF
);
188 span
->redStep
= span
->greenStep
= span
->blueStep
= span
->alphaStep
= 0;
191 span
->interpMask
|= SPAN_INDEX
;
192 span
->index
= ChanToFixed(ctx
->Current
.RasterIndex
);
197 _mesa_span_default_z(ctx
, span
);
198 if (ctx
->Fog
.Enabled
)
199 _mesa_span_default_fog(ctx
, span
);
201 for (row
=0; row
<height
; row
++, span
->y
++) {
202 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address( unpack
,
203 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, 0, row
, 0 );
205 if (unpack
->LsbFirst
) {
207 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
208 for (col
=0; col
<width
; col
++) {
209 span
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
219 if (ctx
->Visual
.rgbMode
)
220 _mesa_write_rgba_span(ctx
, span
);
222 _mesa_write_index_span(ctx
, span
);
224 /* get ready for next row */
230 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
231 for (col
=0; col
<width
; col
++) {
232 span
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
242 if (ctx
->Visual
.rgbMode
)
243 _mesa_write_rgba_span(ctx
, span
);
245 _mesa_write_index_span(ctx
, span
);
247 /* get ready for next row */
253 RENDER_FINISH(swrast
,ctx
);