2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
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11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 * \file swrast/s_bitmap.c
27 * \brief glBitmap rendering.
31 #include "main/glheader.h"
32 #include "main/bufferobj.h"
33 #include "main/image.h"
34 #include "main/macros.h"
37 #include "s_context.h"
44 * Called via ctx->Driver.Bitmap()
45 * All parameter error checking will have been done before this is called.
48 _swrast_Bitmap( struct gl_context
*ctx
, GLint px
, GLint py
,
49 GLsizei width
, GLsizei height
,
50 const struct gl_pixelstore_attrib
*unpack
,
51 const GLubyte
*bitmap
)
57 ASSERT(ctx
->RenderMode
== GL_RENDER
);
59 bitmap
= (const GLubyte
*) _mesa_map_pbo_source(ctx
, unpack
, bitmap
);
63 swrast_render_start(ctx
);
65 if (SWRAST_CONTEXT(ctx
)->NewState
)
66 _swrast_validate_derived( ctx
);
68 INIT_SPAN(span
, GL_BITMAP
);
70 span
.arrayMask
= SPAN_XY
;
71 _swrast_span_default_attribs(ctx
, &span
);
73 for (row
= 0; row
< height
; row
++) {
74 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address2d(unpack
,
75 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, row
, 0);
77 if (unpack
->LsbFirst
) {
79 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
80 for (col
= 0; col
< width
; col
++) {
82 span
.array
->x
[count
] = px
+ col
;
83 span
.array
->y
[count
] = py
+ row
;
95 /* get ready for next row */
101 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
102 for (col
= 0; col
< width
; col
++) {
104 span
.array
->x
[count
] = px
+ col
;
105 span
.array
->y
[count
] = py
+ row
;
117 /* get ready for next row */
122 if (count
+ width
>= MAX_WIDTH
|| row
+ 1 == height
) {
125 _swrast_write_rgba_span(ctx
, &span
);
131 swrast_render_finish(ctx
);
133 _mesa_unmap_pbo_source(ctx
, unpack
);
139 * XXX this is another way to implement Bitmap. Use horizontal runs of
140 * fragments, initializing the mask array to indicate which fragments to
144 _swrast_Bitmap( struct gl_context
*ctx
, GLint px
, GLint py
,
145 GLsizei width
, GLsizei height
,
146 const struct gl_pixelstore_attrib
*unpack
,
147 const GLubyte
*bitmap
)
149 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
153 ASSERT(ctx
->RenderMode
== GL_RENDER
);
156 swrast_render_start(ctx
);
158 if (SWRAST_CONTEXT(ctx
)->NewState
)
159 _swrast_validate_derived( ctx
);
161 INIT_SPAN(span
, GL_BITMAP
);
163 span
.arrayMask
= SPAN_MASK
;
164 _swrast_span_default_attribs(ctx
, &span
);
166 /*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
169 /*span.end = width;*/
171 for (row
=0; row
<height
; row
++, span
.y
++) {
172 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address2d(unpack
,
173 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, row
, 0);
175 if (unpack
->LsbFirst
) {
177 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
178 for (col
=0; col
<width
; col
++) {
179 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
189 _swrast_write_rgba_span(ctx
, &span
);
191 /* get ready for next row */
197 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
198 for (col
=0; col
<width
; col
++) {
199 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
209 _swrast_write_rgba_span(ctx
, &span
);
211 /* get ready for next row */
217 swrast_render_finish(ctx
);