src/mesa/swrast/s_imaging.c

   1 /* $Id: s_imaging.c,v 1.5 2002/04/04 16:53:00 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 /* KW:  Moved these here to remove knowledge of swrast from core mesa.
  28  * Should probably pull the entire software implementation of these
  29  * extensions into either swrast or a sister module.
  30  */
  31
  32 #include "s_context.h"
  33 #include "s_span.h"
  34
  35 void
  36 _swrast_CopyColorTable( GLcontext *ctx,
  37                         GLenum target, GLenum internalformat,
  38                         GLint x, GLint y, GLsizei width)
  39 {
  40    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  41    GLchan data[MAX_WIDTH][4];
  42
  43    /* Select buffer to read from */
  44    (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
  45                                  ctx->Pixel.DriverReadBuffer );
  46
  47    if (width > MAX_WIDTH)
  48       width = MAX_WIDTH;
  49
  50    /* read the data from framebuffer */
  51    _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  52
  53    /* Restore reading from draw buffer (the default) */
  54    (*swrast->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
  55                                  ctx->Color.DriverDrawBuffer );
  56
  57    glColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
  58 }
  59
  60 void
  61 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
  62                            GLint x, GLint y, GLsizei width)
  63 {
  64    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  65    GLchan data[MAX_WIDTH][4];
  66
  67    /* Select buffer to read from */
  68    (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
  69                                  ctx->Pixel.DriverReadBuffer );
  70
  71    if (width > MAX_WIDTH)
  72       width = MAX_WIDTH;
  73
  74    /* read the data from framebuffer */
  75    _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  76
  77    /* Restore reading from draw buffer (the default) */
  78    (*swrast->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
  79                                  ctx->Color.DriverDrawBuffer );
  80
  81    glColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
  82 }
  83
  84
  85 void
  86 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
  87                                 GLenum internalFormat,
  88                                 GLint x, GLint y, GLsizei width)
  89 {
  90    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  91    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
  92
  93    RENDER_START( swrast, ctx );
  94
  95    /* read the data from framebuffer */
  96    _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y,
  97                                 (GLchan (*)[4]) rgba );
  98
  99    RENDER_FINISH( swrast, ctx );
 100
 101    /* store as convolution filter */
 102    glConvolutionFilter1D(target, internalFormat, width,
 103                          GL_RGBA, CHAN_TYPE, rgba);
 104 }
 105
 106
 107 void
 108 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 109                                 GLenum internalFormat,
 110                                 GLint x, GLint y, GLsizei width, GLsizei height)
 111 {
 112    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 113    struct gl_pixelstore_attrib packSave;
 114    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 115    GLint i;
 116
 117    RENDER_START(swrast,ctx);
 118
 119    /* read pixels from framebuffer */
 120    for (i = 0; i < height; i++) {
 121       _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i,
 122                                 (GLchan (*)[4]) rgba[i] );
 123    }
 124
 125    RENDER_FINISH(swrast,ctx);
 126
 127    /*
 128     * HACK: save & restore context state so we can store this as a
 129     * convolution filter via the GL api.  Doesn't call any callbacks
 130     * hanging off ctx->Unpack statechanges.
 131     */
 132
 133    packSave = ctx->Unpack;  /* save pixel packing params */
 134
 135    ctx->Unpack.Alignment = 1;
 136    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 137    ctx->Unpack.SkipPixels = 0;
 138    ctx->Unpack.SkipRows = 0;
 139    ctx->Unpack.ImageHeight = 0;
 140    ctx->Unpack.SkipImages = 0;
 141    ctx->Unpack.SwapBytes = GL_FALSE;
 142    ctx->Unpack.LsbFirst = GL_FALSE;
 143    ctx->NewState |= _NEW_PACKUNPACK;
 144
 145    glConvolutionFilter2D(target, internalFormat, width, height,
 146                          GL_RGBA, CHAN_TYPE, rgba);
 147
 148    ctx->Unpack = packSave;  /* restore pixel packing params */
 149    ctx->NewState |= _NEW_PACKUNPACK;
 150 }