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/* $Id: s_imaging.c,v 1.1 2003-02-28 11:49:42 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  4.1
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 *
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 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 */
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/* KW:  Moved these here to remove knowledge of swrast from core mesa.
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 * Should probably pull the entire software implementation of these
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 * extensions into either swrast or a sister module.  
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 */
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#include "s_context.h"
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#include "s_span.h"
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void
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_swrast_CopyColorTable( GLcontext *ctx,
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                        GLenum target, GLenum internalformat,
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                        GLint x, GLint y, GLsizei width)
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{
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   GLchan data[MAX_WIDTH][4];
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   /* Select buffer to read from */
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   _swrast_use_read_buffer(ctx);
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   if (width > MAX_WIDTH)
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      width = MAX_WIDTH;
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   /* read the data from framebuffer */
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   _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
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   /* Restore reading from draw buffer (the default) */
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   _swrast_use_draw_buffer(ctx);
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   glColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
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}
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void
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_swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
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                           GLint x, GLint y, GLsizei width)
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{
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   GLchan data[MAX_WIDTH][4];
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   /* Select buffer to read from */
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   _swrast_use_read_buffer(ctx);
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   if (width > MAX_WIDTH)
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      width = MAX_WIDTH;
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   /* read the data from framebuffer */
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   _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
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   /* Restore reading from draw buffer (the default) */
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   _swrast_use_draw_buffer(ctx);
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   glColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
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}
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void
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_swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
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                                GLenum internalFormat,
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                                GLint x, GLint y, GLsizei width)
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{
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   SWcontext *swrast = SWRAST_CONTEXT(ctx);
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   GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
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   /* Select buffer to read from */
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   _swrast_use_read_buffer(ctx);
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   RENDER_START( swrast, ctx );
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   /* read the data from framebuffer */
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   _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y,
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                                (GLchan (*)[4]) rgba );
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   RENDER_FINISH( swrast, ctx );
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   /* Restore reading from draw buffer (the default) */
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   _swrast_use_draw_buffer(ctx);
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   /* store as convolution filter */
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   glConvolutionFilter1D(target, internalFormat, width,
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                         GL_RGBA, CHAN_TYPE, rgba);
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}
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void
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_swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
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                                GLenum internalFormat,
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                                GLint x, GLint y, GLsizei width, GLsizei height)
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{
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   SWcontext *swrast = SWRAST_CONTEXT(ctx);
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   struct gl_pixelstore_attrib packSave;
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   GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
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   GLint i;
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   /* Select buffer to read from */
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   _swrast_use_read_buffer(ctx);
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   RENDER_START(swrast,ctx);
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   /* read pixels from framebuffer */
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   for (i = 0; i < height; i++) {
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      _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i,
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                                (GLchan (*)[4]) rgba[i] );
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   }
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   RENDER_FINISH(swrast,ctx);
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   /* Restore reading from draw buffer (the default) */
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   _swrast_use_draw_buffer(ctx);
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   /*
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    * HACK: save & restore context state so we can store this as a
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    * convolution filter via the GL api.  Doesn't call any callbacks
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    * hanging off ctx->Unpack statechanges.
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    */
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   packSave = ctx->Unpack;  /* save pixel packing params */
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   ctx->Unpack.Alignment = 1;
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   ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
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   ctx->Unpack.SkipPixels = 0;
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   ctx->Unpack.SkipRows = 0;
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   ctx->Unpack.ImageHeight = 0;
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   ctx->Unpack.SkipImages = 0;
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   ctx->Unpack.SwapBytes = GL_FALSE;
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   ctx->Unpack.LsbFirst = GL_FALSE;
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   ctx->NewState |= _NEW_PACKUNPACK;
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   glConvolutionFilter2D(target, internalFormat, width, height,
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                         GL_RGBA, CHAN_TYPE, rgba);
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   ctx->Unpack = packSave;  /* restore pixel packing params */
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   ctx->NewState |= _NEW_PACKUNPACK;
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}