2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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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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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,
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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"
35 #include "main/pixel.h"
37 #include "s_context.h"
46 * Called via ctx->Driver.Bitmap()
47 * All parameter error checking will have been done before this is called.
50 _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
51 GLsizei width, GLsizei height,
52 const struct gl_pixelstore_attrib *unpack,
53 const GLubyte *bitmap )
59 ASSERT(ctx->RenderMode == GL_RENDER);
61 bitmap = (const GLubyte *) _mesa_map_pbo_source(ctx, unpack, bitmap);
65 swrast_render_start(ctx);
67 if (SWRAST_CONTEXT(ctx)->NewState)
68 _swrast_validate_derived( ctx );
70 INIT_SPAN(span, GL_BITMAP);
72 span.arrayMask = SPAN_XY;
73 _swrast_span_default_attribs(ctx, &span);
75 for (row = 0; row < height; row++) {
76 const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
77 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
79 if (unpack->LsbFirst) {
81 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
82 for (col = 0; col < width; col++) {
84 span.array->x[count] = px + col;
85 span.array->y[count] = py + row;
97 /* get ready for next row */
103 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
104 for (col = 0; col < width; col++) {
106 span.array->x[count] = px + col;
107 span.array->y[count] = py + row;
119 /* get ready for next row */
124 if (count + width >= MAX_WIDTH || row + 1 == height) {
127 if (ctx->Visual.rgbMode)
128 _swrast_write_rgba_span(ctx, &span);
130 _swrast_write_index_span(ctx, &span);
136 swrast_render_finish(ctx);
138 _mesa_unmap_pbo_source(ctx, unpack);
144 * XXX this is another way to implement Bitmap. Use horizontal runs of
145 * fragments, initializing the mask array to indicate which fragments to
149 _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
150 GLsizei width, GLsizei height,
151 const struct gl_pixelstore_attrib *unpack,
152 const GLubyte *bitmap )
154 SWcontext *swrast = SWRAST_CONTEXT(ctx);
158 ASSERT(ctx->RenderMode == GL_RENDER);
161 swrast_render_start(ctx);
163 if (SWRAST_CONTEXT(ctx)->NewState)
164 _swrast_validate_derived( ctx );
166 INIT_SPAN(span, GL_BITMAP);
168 span.arrayMask = SPAN_MASK;
169 _swrast_span_default_attribs(ctx, &span);
171 /*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
174 /*span.end = width;*/
176 for (row=0; row<height; row++, span.y++) {
177 const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
178 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
180 if (unpack->LsbFirst) {
182 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
183 for (col=0; col<width; col++) {
184 span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
194 if (ctx->Visual.rgbMode)
195 _swrast_write_rgba_span(ctx, &span);
197 _swrast_write_index_span(ctx, &span);
199 /* get ready for next row */
205 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
206 for (col=0; col<width; col++) {
207 span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
217 if (ctx->Visual.rgbMode)
218 _swrast_write_rgba_span(ctx, &span);
220 _swrast_write_index_span(ctx, &span);
222 /* get ready for next row */
228 swrast_render_finish(ctx);
233 #endif /* FEATURE_drawpix */