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/* $Id: s_imaging.c,v 1.6 2002/07/09 01:22:52 brianp 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.
*/
/* KW: Moved these here to remove knowledge of swrast from core mesa.
* Should probably pull the entire software implementation of these
* extensions into either swrast or a sister module.
*/
#include "s_context.h"
#include "s_span.h"
void
_swrast_CopyColorTable( GLcontext *ctx,
GLenum target, GLenum internalformat,
GLint x, GLint y, GLsizei width)
{
GLchan data[MAX_WIDTH][4];
/* Select buffer to read from */
_swrast_use_read_buffer(ctx);
if (width > MAX_WIDTH)
width = MAX_WIDTH;
/* read the data from framebuffer */
_mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
/* Restore reading from draw buffer (the default) */
_swrast_use_draw_buffer(ctx);
glColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
}
void
_swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
GLint x, GLint y, GLsizei width)
{
GLchan data[MAX_WIDTH][4];
/* Select buffer to read from */
_swrast_use_read_buffer(ctx);
if (width > MAX_WIDTH)
width = MAX_WIDTH;
/* read the data from framebuffer */
_mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
/* Restore reading from draw buffer (the default) */
_swrast_use_draw_buffer(ctx);
glColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
}
void
_swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
GLenum internalFormat,
GLint x, GLint y, GLsizei width)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
/* Select buffer to read from */
_swrast_use_read_buffer(ctx);
RENDER_START( swrast, ctx );
/* read the data from framebuffer */
_mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y,
(GLchan (*)[4]) rgba );
RENDER_FINISH( swrast, ctx );
/* Restore reading from draw buffer (the default) */
_swrast_use_draw_buffer(ctx);
/* store as convolution filter */
glConvolutionFilter1D(target, internalFormat, width,
GL_RGBA, CHAN_TYPE, rgba);
}
void
_swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
GLenum internalFormat,
GLint x, GLint y, GLsizei width, GLsizei height)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct gl_pixelstore_attrib packSave;
GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
GLint i;
/* Select buffer to read from */
_swrast_use_read_buffer(ctx);
RENDER_START(swrast,ctx);
/* read pixels from framebuffer */
for (i = 0; i < height; i++) {
_mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i,
(GLchan (*)[4]) rgba[i] );
}
RENDER_FINISH(swrast,ctx);
/* Restore reading from draw buffer (the default) */
_swrast_use_draw_buffer(ctx);
/*
* HACK: save & restore context state so we can store this as a
* convolution filter via the GL api. Doesn't call any callbacks
* hanging off ctx->Unpack statechanges.
*/
packSave = ctx->Unpack; /* save pixel packing params */
ctx->Unpack.Alignment = 1;
ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
ctx->Unpack.SkipPixels = 0;
ctx->Unpack.SkipRows = 0;
ctx->Unpack.ImageHeight = 0;
ctx->Unpack.SkipImages = 0;
ctx->Unpack.SwapBytes = GL_FALSE;
ctx->Unpack.LsbFirst = GL_FALSE;
ctx->NewState |= _NEW_PACKUNPACK;
glConvolutionFilter2D(target, internalFormat, width, height,
GL_RGBA, CHAN_TYPE, rgba);
ctx->Unpack = packSave; /* restore pixel packing params */
ctx->NewState |= _NEW_PACKUNPACK;
}
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