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/* $Id: s_bitmap.c,v 1.1 2003-02-28 11:49:41 pj Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 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.
*/
/**
* \file swrast/s_bitmap.c
* \brief glBitmap rendering.
* \author Brian Paul
*/
#include "glheader.h"
#include "image.h"
#include "macros.h"
#include "mmath.h"
#include "pixel.h"
#include "s_context.h"
#include "s_span.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);
GLint row, col;
GLuint count = 0;
struct sw_span span;
ASSERT(ctx->RenderMode == GL_RENDER);
ASSERT(bitmap);
RENDER_START(swrast,ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_XY);
if (ctx->Visual.rgbMode) {
span.interpMask |= SPAN_RGBA;
span.red = FloatToFixed(ctx->Current.RasterColor[0] * CHAN_MAXF);
span.green = FloatToFixed(ctx->Current.RasterColor[1] * CHAN_MAXF);
span.blue = FloatToFixed(ctx->Current.RasterColor[2] * CHAN_MAXF);
span.alpha = FloatToFixed(ctx->Current.RasterColor[3] * CHAN_MAXF);
span.redStep = span.greenStep = span.blueStep = span.alphaStep = 0;
}
else {
span.interpMask |= SPAN_INDEX;
span.index = ChanToFixed(ctx->Current.RasterIndex);
span.indexStep = 0;
}
if (ctx->Depth.Test)
_mesa_span_default_z(ctx, &span);
if (ctx->Fog.Enabled)
_mesa_span_default_fog(ctx, &span);
for (row = 0; row < height; row++, span.y++) {
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) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
/* 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) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
/* get ready for next row */
if (mask != 128)
src++;
}
if (count + width >= MAX_WIDTH || row + 1 == height) {
/* flush the span */
span.end = count;
if (ctx->Visual.rgbMode)
_mesa_write_rgba_span(ctx, &span);
else
_mesa_write_index_span(ctx, &span);
span.end = 0;
count = 0;
}
}
RENDER_FINISH(swrast,ctx);
}
#if 0
/*
* XXX this is another way to implement Bitmap. Use horizontal runs of
* fragments, initializing the mask array to indicate which fragmens to
* draw or skip.
*/
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);
GLint row, col;
struct sw_span span;
ASSERT(ctx->RenderMode == GL_RENDER);
ASSERT(bitmap);
RENDER_START(swrast,ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_MASK);
/*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
span.x = px;
span.y = py;
/*span.end = width;*/
if (ctx->Visual.rgbMode) {
span.interpMask |= SPAN_RGBA;
span.red = FloatToFixed(ctx->Current.RasterColor[0] * CHAN_MAXF);
span.green = FloatToFixed(ctx->Current.RasterColor[1] * CHAN_MAXF);
span.blue = FloatToFixed(ctx->Current.RasterColor[2] * CHAN_MAXF);
span.alpha = FloatToFixed(ctx->Current.RasterColor[3] * CHAN_MAXF);
span.redStep = span.greenStep = span.blueStep = span.alphaStep = 0;
}
else {
span.interpMask |= SPAN_INDEX;
span.index = ChanToFixed(ctx->Current.RasterIndex);
span.indexStep = 0;
}
if (ctx->Depth.Test)
_mesa_span_default_z(ctx, &span);
if (ctx->Fog.Enabled)
_mesa_span_default_fog(ctx, &span);
for (row=0; row<height; row++, span.y++) {
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++) {
span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
if (ctx->Visual.rgbMode)
_mesa_write_rgba_span(ctx, &span);
else
_mesa_write_index_span(ctx, &span);
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col=0; col<width; col++) {
span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
if (ctx->Visual.rgbMode)
_mesa_write_rgba_span(ctx, &span);
else
_mesa_write_index_span(ctx, &span);
/* get ready for next row */
if (mask != 128)
src++;
}
}
RENDER_FINISH(swrast,ctx);
}
#endif