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/* $Id: s_bitmap.c,v 1.13 2001/12/14 02:50:57 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glheader.h"
#include "image.h"
#include "macros.h"
#include "pixel.h"
#include "s_context.h"
#include "s_fog.h"
#include "s_pb.h"
/*
* Render a bitmap.
*/
void
_swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct pixel_buffer *PB = swrast->PB;
GLint row, col;
GLdepth fragZ;
GLfloat fog;
ASSERT(ctx->RenderMode == GL_RENDER);
ASSERT(bitmap);
RENDER_START(swrast,ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
/* Set bitmap drawing color */
if (ctx->Visual.rgbMode) {
GLint r, g, b, a;
r = (GLint) (ctx->Current.RasterColor[0] * CHAN_MAXF);
g = (GLint) (ctx->Current.RasterColor[1] * CHAN_MAXF);
b = (GLint) (ctx->Current.RasterColor[2] * CHAN_MAXF);
a = (GLint) (ctx->Current.RasterColor[3] * CHAN_MAXF);
PB_SET_COLOR( PB, r, g, b, a );
}
else {
PB_SET_INDEX( PB, ctx->Current.RasterIndex );
}
fragZ = (GLdepth) ( ctx->Current.RasterPos[2] * ctx->DepthMaxF);
if (ctx->Fog.Enabled) {
if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
fog = _mesa_z_to_fogfactor(ctx, ctx->Current.Attrib[VERT_ATTRIB_FOG][0]);
else
fog = _mesa_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
}
else {
fog = 0.0;
}
for (row=0; row<height; row++) {
const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
if (unpack->LsbFirst) {
/* Lsb first */
GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
for (col=0; col<width; col++) {
if (*src & mask) {
PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fog );
}
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
PB_CHECK_FLUSH( ctx, PB );
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col=0; col<width; col++) {
if (*src & mask) {
PB_WRITE_PIXEL( PB, px+col, py+row, fragZ, fog );
}
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
PB_CHECK_FLUSH( ctx, PB );
/* get ready for next row */
if (mask != 128)
src++;
}
}
_mesa_flush_pb(ctx);
RENDER_FINISH(swrast,ctx);
}
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