src/mesa/swrast/s_imaging.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /* KW:  Moved these here to remove knowledge of swrast from core mesa.
  26  * Should probably pull the entire software implementation of these
  27  * extensions into either swrast or a sister module.
  28  */
  29
  30 #include "s_context.h"
  31 #include "s_span.h"
  32 #include "colortab.h"
  33 #include "convolve.h"
  34
  35
  36 void
  37 _swrast_CopyColorTable( GLcontext *ctx,
  38                         GLenum target, GLenum internalformat,
  39                         GLint x, GLint y, GLsizei width)
  40 {
  41    GLchan data[MAX_WIDTH][4];
  42
  43    /* Select buffer to read from */
  44    _swrast_use_read_buffer(ctx);
  45
  46    if (width > MAX_WIDTH)
  47       width = MAX_WIDTH;
  48
  49    /* read the data from framebuffer */
  50    _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  51
  52    /* Restore reading from draw buffer (the default) */
  53    _swrast_use_draw_buffer(ctx);
  54
  55    _mesa_ColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
  56 }
  57
  58
  59 void
  60 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
  61                            GLint x, GLint y, GLsizei width)
  62 {
  63    GLchan data[MAX_WIDTH][4];
  64
  65    /* Select buffer to read from */
  66    _swrast_use_read_buffer(ctx);
  67
  68    if (width > MAX_WIDTH)
  69       width = MAX_WIDTH;
  70
  71    /* read the data from framebuffer */
  72    _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  73
  74    /* Restore reading from draw buffer (the default) */
  75    _swrast_use_draw_buffer(ctx);
  76
  77    _mesa_ColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
  78 }
  79
  80
  81 void
  82 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
  83                                 GLenum internalFormat,
  84                                 GLint x, GLint y, GLsizei width)
  85 {
  86    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  87    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
  88
  89    /* Select buffer to read from */
  90    _swrast_use_read_buffer(ctx);
  91
  92    RENDER_START( swrast, ctx );
  93
  94    /* read the data from framebuffer */
  95    _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y,
  96                                 (GLchan (*)[4]) rgba );
  97
  98    RENDER_FINISH( swrast, ctx );
  99
 100    /* Restore reading from draw buffer (the default) */
 101    _swrast_use_draw_buffer(ctx);
 102
 103    /* store as convolution filter */
 104    _mesa_ConvolutionFilter1D(target, internalFormat, width,
 105                              GL_RGBA, CHAN_TYPE, rgba);
 106 }
 107
 108
 109 void
 110 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 111                                 GLenum internalFormat,
 112                                 GLint x, GLint y, GLsizei width, GLsizei height)
 113 {
 114    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 115    struct gl_pixelstore_attrib packSave;
 116    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 117    GLint i;
 118
 119    /* Select buffer to read from */
 120    _swrast_use_read_buffer(ctx);
 121
 122    RENDER_START(swrast,ctx);
 123
 124    /* read pixels from framebuffer */
 125    for (i = 0; i < height; i++) {
 126       _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i,
 127                                 (GLchan (*)[4]) rgba[i] );
 128    }
 129
 130    RENDER_FINISH(swrast,ctx);
 131
 132    /* Restore reading from draw buffer (the default) */
 133    _swrast_use_draw_buffer(ctx);
 134
 135    /*
 136     * HACK: save & restore context state so we can store this as a
 137     * convolution filter via the GL api.  Doesn't call any callbacks
 138     * hanging off ctx->Unpack statechanges.
 139     */
 140
 141    packSave = ctx->Unpack;  /* save pixel packing params */
 142
 143    ctx->Unpack.Alignment = 1;
 144    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 145    ctx->Unpack.SkipPixels = 0;
 146    ctx->Unpack.SkipRows = 0;
 147    ctx->Unpack.ImageHeight = 0;
 148    ctx->Unpack.SkipImages = 0;
 149    ctx->Unpack.SwapBytes = GL_FALSE;
 150    ctx->Unpack.LsbFirst = GL_FALSE;
 151    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 152    ctx->NewState |= _NEW_PACKUNPACK;
 153
 154    _mesa_ConvolutionFilter2D(target, internalFormat, width, height,
 155                              GL_RGBA, CHAN_TYPE, rgba);
 156
 157    ctx->Unpack = packSave;  /* restore pixel packing params */
 158    ctx->NewState |= _NEW_PACKUNPACK;
 159 }