2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 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
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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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22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 if (unpack
->BufferObj
->Name
) {
63 if (!_mesa_validate_pbo_access(2, unpack
, width
, height
, 1,
64 GL_COLOR_INDEX
, GL_BITMAP
,
66 _mesa_error(ctx
, GL_INVALID_OPERATION
,"glBitmap(invalid PBO access)");
69 buf
= (GLubyte
*) ctx
->Driver
.MapBuffer(ctx
, GL_PIXEL_UNPACK_BUFFER_EXT
,
73 /* buffer is already mapped - that's an error */
74 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glBitmap(PBO is mapped)");
77 bitmap
= ADD_POINTERS(buf
, bitmap
);
80 RENDER_START(swrast
,ctx
);
82 if (SWRAST_CONTEXT(ctx
)->NewState
)
83 _swrast_validate_derived( ctx
);
85 INIT_SPAN(span
, GL_BITMAP
, width
, 0, SPAN_XY
);
86 _swrast_span_default_attribs(ctx
, &span
);
88 for (row
= 0; row
< height
; row
++) {
89 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address2d(unpack
,
90 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, row
, 0);
92 if (unpack
->LsbFirst
) {
94 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
95 for (col
= 0; col
< width
; col
++) {
97 span
.array
->x
[count
] = px
+ col
;
98 span
.array
->y
[count
] = py
+ row
;
110 /* get ready for next row */
116 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
117 for (col
= 0; col
< width
; col
++) {
119 span
.array
->x
[count
] = px
+ col
;
120 span
.array
->y
[count
] = py
+ row
;
132 /* get ready for next row */
137 if (count
+ width
>= MAX_WIDTH
|| row
+ 1 == height
) {
140 if (ctx
->Visual
.rgbMode
)
141 _swrast_write_rgba_span(ctx
, &span
);
143 _swrast_write_index_span(ctx
, &span
);
149 RENDER_FINISH(swrast
,ctx
);
151 if (unpack
->BufferObj
->Name
) {
152 /* done with PBO so unmap it now */
153 ctx
->Driver
.UnmapBuffer(ctx
, GL_PIXEL_UNPACK_BUFFER_EXT
,
161 * XXX this is another way to implement Bitmap. Use horizontal runs of
162 * fragments, initializing the mask array to indicate which fragments to
166 _swrast_Bitmap( GLcontext
*ctx
, GLint px
, GLint py
,
167 GLsizei width
, GLsizei height
,
168 const struct gl_pixelstore_attrib
*unpack
,
169 const GLubyte
*bitmap
)
171 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
175 ASSERT(ctx
->RenderMode
== GL_RENDER
);
178 RENDER_START(swrast
,ctx
);
180 if (SWRAST_CONTEXT(ctx
)->NewState
)
181 _swrast_validate_derived( ctx
);
183 INIT_SPAN(span
, GL_BITMAP
, width
, 0, SPAN_MASK
);
184 _swrast_span_default_attribs(ctx
, &span
);
186 /*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
189 /*span.end = width;*/
191 for (row
=0; row
<height
; row
++, span
.y
++) {
192 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address2d(unpack
,
193 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, row
, 0);
195 if (unpack
->LsbFirst
) {
197 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
198 for (col
=0; col
<width
; col
++) {
199 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
209 if (ctx
->Visual
.rgbMode
)
210 _swrast_write_rgba_span(ctx
, &span
);
212 _swrast_write_index_span(ctx
, &span
);
214 /* get ready for next row */
220 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
221 for (col
=0; col
<width
; col
++) {
222 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
232 if (ctx
->Visual
.rgbMode
)
233 _swrast_write_rgba_span(ctx
, &span
);
235 _swrast_write_index_span(ctx
, &span
);
237 /* get ready for next row */
243 RENDER_FINISH(swrast
,ctx
);