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
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26 * \file swrast/s_bitmap.c
27 * \brief glBitmap rendering.
32 #include "bufferobj.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( 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
);
58 ASSERT(ctx
->RenderMode
== GL_RENDER
);
60 bitmap
= _mesa_map_bitmap_pbo(ctx
, unpack
, bitmap
);
64 RENDER_START(swrast
,ctx
);
66 if (SWRAST_CONTEXT(ctx
)->NewState
)
67 _swrast_validate_derived( ctx
);
69 INIT_SPAN(span
, GL_BITMAP
);
71 span
.arrayMask
= SPAN_XY
;
72 _swrast_span_default_attribs(ctx
, &span
);
74 for (row
= 0; row
< height
; row
++) {
75 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address2d(unpack
,
76 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, row
, 0);
78 if (unpack
->LsbFirst
) {
80 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
81 for (col
= 0; col
< width
; col
++) {
83 span
.array
->x
[count
] = px
+ col
;
84 span
.array
->y
[count
] = py
+ row
;
96 /* get ready for next row */
102 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
103 for (col
= 0; col
< width
; col
++) {
105 span
.array
->x
[count
] = px
+ col
;
106 span
.array
->y
[count
] = py
+ row
;
118 /* get ready for next row */
123 if (count
+ width
>= MAX_WIDTH
|| row
+ 1 == height
) {
126 if (ctx
->Visual
.rgbMode
)
127 _swrast_write_rgba_span(ctx
, &span
);
129 _swrast_write_index_span(ctx
, &span
);
135 RENDER_FINISH(swrast
,ctx
);
137 _mesa_unmap_bitmap_pbo(ctx
, unpack
);
143 * XXX this is another way to implement Bitmap. Use horizontal runs of
144 * fragments, initializing the mask array to indicate which fragments to
148 _swrast_Bitmap( GLcontext
*ctx
, GLint px
, GLint py
,
149 GLsizei width
, GLsizei height
,
150 const struct gl_pixelstore_attrib
*unpack
,
151 const GLubyte
*bitmap
)
153 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
157 ASSERT(ctx
->RenderMode
== GL_RENDER
);
160 RENDER_START(swrast
,ctx
);
162 if (SWRAST_CONTEXT(ctx
)->NewState
)
163 _swrast_validate_derived( ctx
);
165 INIT_SPAN(span
, GL_BITMAP
);
167 span
.arrayMask
= SPAN_MASK
;
168 _swrast_span_default_attribs(ctx
, &span
);
170 /*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
173 /*span.end = width;*/
175 for (row
=0; row
<height
; row
++, span
.y
++) {
176 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address2d(unpack
,
177 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, row
, 0);
179 if (unpack
->LsbFirst
) {
181 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
182 for (col
=0; col
<width
; col
++) {
183 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
193 if (ctx
->Visual
.rgbMode
)
194 _swrast_write_rgba_span(ctx
, &span
);
196 _swrast_write_index_span(ctx
, &span
);
198 /* get ready for next row */
204 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
205 for (col
=0; col
<width
; col
++) {
206 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
216 if (ctx
->Visual
.rgbMode
)
217 _swrast_write_rgba_span(ctx
, &span
);
219 _swrast_write_index_span(ctx
, &span
);
221 /* get ready for next row */
227 RENDER_FINISH(swrast
,ctx
);