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
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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/condrender.h"
34 #include "main/image.h"
35 #include "main/macros.h"
38 #include "s_context.h"
45 * Called via ctx->Driver.Bitmap()
46 * All parameter error checking will have been done before this is called.
49 _swrast_Bitmap( struct gl_context *ctx, GLint px, GLint py,
50 GLsizei width, GLsizei height,
51 const struct gl_pixelstore_attrib *unpack,
52 const GLubyte *bitmap )
58 ASSERT(ctx->RenderMode == GL_RENDER);
60 if (!_mesa_check_conditional_render(ctx))
61 return; /* don't draw */
63 bitmap = (const GLubyte *) _mesa_map_pbo_source(ctx, unpack, bitmap);
67 swrast_render_start(ctx);
69 if (SWRAST_CONTEXT(ctx)->NewState)
70 _swrast_validate_derived( ctx );
72 INIT_SPAN(span, GL_BITMAP);
74 span.arrayMask = SPAN_XY;
75 _swrast_span_default_attribs(ctx, &span);
77 for (row = 0; row < height; row++) {
78 const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
79 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
81 if (unpack->LsbFirst) {
83 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
84 for (col = 0; col < width; col++) {
86 span.array->x[count] = px + col;
87 span.array->y[count] = py + row;
99 /* get ready for next row */
105 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
106 for (col = 0; col < width; col++) {
108 span.array->x[count] = px + col;
109 span.array->y[count] = py + row;
121 /* get ready for next row */
126 if (count + width >= MAX_WIDTH || row + 1 == height) {
129 _swrast_write_rgba_span(ctx, &span);
135 swrast_render_finish(ctx);
137 _mesa_unmap_pbo_source(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( struct gl_context *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 swrast_render_start(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 _swrast_write_rgba_span(ctx, &span);
195 /* get ready for next row */
201 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
202 for (col=0; col<width; col++) {
203 span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
213 _swrast_write_rgba_span(ctx, &span);
215 /* get ready for next row */
221 swrast_render_finish(ctx);