src/mesa/swrast/s_copypix.c

   1 /* $Id: s_copypix.c,v 1.9 2001/01/05 21:28:31 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2000  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
  28 #include "glheader.h"
  29 #include "colormac.h"
  30 #include "context.h"
  31 #include "convolve.h"
  32 #include "feedback.h"
  33 #include "macros.h"
  34 #include "mem.h"
  35 #include "mmath.h"
  36 #include "pixel.h"
  37
  38 #include "s_context.h"
  39 #include "s_depth.h"
  40 #include "s_histogram.h"
  41 #include "s_pixeltex.h"
  42 #include "s_span.h"
  43 #include "s_stencil.h"
  44 #include "s_texture.h"
  45 #include "s_zoom.h"
  46
  47
  48
  49 /*
  50  * Determine if there's overlap in an image copy
  51  */
  52 static GLboolean
  53 regions_overlap(int srcx, int srcy, int dstx, int dsty, int width, int height,
  54                 float zoomX, float zoomY)
  55 {
  56    if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
  57       return GL_FALSE;
  58    }
  59    else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
  60       return GL_FALSE;
  61    }
  62    else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
  63       return GL_FALSE;
  64    }
  65    else {
  66       return GL_TRUE;
  67    }
  68 }
  69
  70
  71
  72 /*
  73  * RGBA copypixels with convolution.
  74  */
  75 static void
  76 copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
  77                       GLint width, GLint height, GLint destx, GLint desty)
  78 {
  79    GLdepth zspan[MAX_WIDTH];
  80    GLboolean quick_draw;
  81    GLint row;
  82    GLboolean changeBuffer;
  83    GLchan *saveReadAlpha;
  84    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
  85    const GLuint transferOps = ctx->_ImageTransferState;
  86    GLfloat *dest, *tmpImage, *convImage;
  87
  88    if (ctx->Depth.Test || ctx->Fog.Enabled) {
  89       /* fill in array of z values */
  90       GLdepth z = (GLdepth)
  91          (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
  92       GLint i;
  93       for (i = 0; i < width; i++) {
  94          zspan[i] = z;
  95       }
  96    }
  97
  98    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
  99        && !zoom
 100        && destx >= 0
 101        && destx + width <= ctx->DrawBuffer->Width) {
 102       quick_draw = GL_TRUE;
 103    }
 104    else {
 105       quick_draw = GL_FALSE;
 106    }
 107
 108    /* If read and draw buffer are different we must do buffer switching */
 109    saveReadAlpha = ctx->ReadBuffer->Alpha;
 110    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 111                || ctx->DrawBuffer != ctx->ReadBuffer;
 112
 113
 114    /* allocate space for GLfloat image */
 115    tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 116    if (!tmpImage) {
 117       gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 118       return;
 119    }
 120    convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 121    if (!convImage) {
 122       FREE(tmpImage);
 123       gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 124       return;
 125    }
 126
 127    dest = tmpImage;
 128
 129    if (changeBuffer) {
 130       (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 131                                     ctx->Pixel.DriverReadBuffer );
 132       if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
 133          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 134       else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
 135          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 136       else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
 137          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 138       else
 139          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 140    }
 141
 142    /* read source image */
 143    dest = tmpImage;
 144    for (row = 0; row < height; row++) {
 145       GLchan rgba[MAX_WIDTH][4];
 146       GLint i;
 147       gl_read_rgba_span(ctx, ctx->ReadBuffer, width, srcx, srcy + row, rgba);
 148       /* convert GLchan to GLfloat */
 149       for (i = 0; i < width; i++) {
 150          *dest++ = (GLfloat) rgba[i][RCOMP] * (1.0F / CHAN_MAXF);
 151          *dest++ = (GLfloat) rgba[i][GCOMP] * (1.0F / CHAN_MAXF);
 152          *dest++ = (GLfloat) rgba[i][BCOMP] * (1.0F / CHAN_MAXF);
 153          *dest++ = (GLfloat) rgba[i][ACOMP] * (1.0F / CHAN_MAXF);
 154       }
 155    }
 156
 157    /* read from the draw buffer again (in case of blending) */
 158    if (changeBuffer) {
 159       (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 160                                     ctx->Color.DriverDrawBuffer );
 161       ctx->ReadBuffer->Alpha = saveReadAlpha;
 162    }
 163
 164    /* do image transfer ops up until convolution */
 165    for (row = 0; row < height; row++) {
 166       GLfloat (*rgba)[4] = (GLfloat (*)[4]) tmpImage + row * width * 4;
 167
 168       /* scale & bias */
 169       if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 170          _mesa_scale_and_bias_rgba(ctx, width, rgba,
 171                                    ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 172                                    ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 173                                    ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 174                                    ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 175       }
 176       /* color map lookup */
 177       if (transferOps & IMAGE_MAP_COLOR_BIT) {
 178          _mesa_map_rgba(ctx, width, rgba);
 179       }
 180       /* GL_COLOR_TABLE lookup */
 181       if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 182          _mesa_lookup_rgba(&ctx->ColorTable, width, rgba);
 183       }
 184    }
 185
 186    /* do convolution */
 187    if (ctx->Pixel.Convolution2DEnabled) {
 188       _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 189    }
 190    else {
 191       ASSERT(ctx->Pixel.Separable2DEnabled);
 192       _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 193    }
 194    FREE(tmpImage);
 195
 196    /* do remaining image transfer ops */
 197    for (row = 0; row < height; row++) {
 198       GLfloat (*rgba)[4] = (GLfloat (*)[4]) convImage + row * width * 4;
 199
 200       /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 201       if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 202          _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgba);
 203       }
 204       /* color matrix */
 205       if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 206          _mesa_transform_rgba(ctx, width, rgba);
 207       }
 208       /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 209       if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 210          _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgba);
 211       }
 212       /* update histogram count */
 213       if (transferOps & IMAGE_HISTOGRAM_BIT) {
 214          _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgba);
 215       }
 216       /* update min/max */
 217       if (transferOps & IMAGE_MIN_MAX_BIT) {
 218          _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgba);
 219       }
 220    }
 221
 222    for (row = 0; row < height; row++) {
 223       const GLfloat *src = convImage + row * width * 4;
 224       GLchan rgba[MAX_WIDTH][4];
 225       GLint i, dy;
 226
 227       /* clamp to [0,1] and convert float back to chan */
 228       for (i = 0; i < width; i++) {
 229          GLint r = (GLint) (src[i * 4 + RCOMP] * CHAN_MAXF);
 230          GLint g = (GLint) (src[i * 4 + GCOMP] * CHAN_MAXF);
 231          GLint b = (GLint) (src[i * 4 + BCOMP] * CHAN_MAXF);
 232          GLint a = (GLint) (src[i * 4 + ACOMP] * CHAN_MAXF);
 233          rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 234          rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 235          rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 236          rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 237       }
 238
 239       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 240          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 241          GLchan primary_rgba[MAX_WIDTH][4];
 242          GLuint unit;
 243          /* XXX not sure how multitexture is supposed to work here */
 244
 245          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 246
 247          for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
 248             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 249                               s, t, r, q);
 250             _swrast_texture_fragments(ctx, unit, width, s, t, r, NULL,
 251                                       primary_rgba, rgba);
 252          }
 253       }
 254
 255       /* write row to framebuffer */
 256
 257       dy = desty + row;
 258       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 259          (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 260                                        (const GLchan (*)[4])rgba, NULL );
 261       }
 262       else if (zoom) {
 263          gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 264                                     (const GLchan (*)[4])rgba, desty);
 265       }
 266       else {
 267          gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
 268       }
 269    }
 270
 271    FREE(convImage);
 272 }
 273
 274
 275 /*
 276  * RGBA copypixels
 277  */
 278 static void
 279 copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 280                  GLint width, GLint height, GLint destx, GLint desty)
 281 {
 282    GLdepth zspan[MAX_WIDTH];
 283    GLchan rgba[MAX_WIDTH][4];
 284    GLchan *tmpImage,*p;
 285    GLboolean quick_draw;
 286    GLint sy, dy, stepy;
 287    GLint i, j;
 288    GLboolean changeBuffer;
 289    GLchan *saveReadAlpha;
 290    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 291    GLint overlapping;
 292    const GLuint transferOps = ctx->_ImageTransferState;
 293
 294    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 295       copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
 296       return;
 297    }
 298
 299    /* Determine if copy should be done bottom-to-top or top-to-bottom */
 300    if (srcy < desty) {
 301       /* top-down  max-to-min */
 302       sy = srcy + height - 1;
 303       dy = desty + height - 1;
 304       stepy = -1;
 305    }
 306    else {
 307       /* bottom-up  min-to-max */
 308       sy = srcy;
 309       dy = desty;
 310       stepy = 1;
 311    }
 312
 313    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 314                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 315
 316    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 317       /* fill in array of z values */
 318       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
 319       for (i=0;i<width;i++) {
 320          zspan[i] = z;
 321       }
 322    }
 323
 324    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
 325        && !zoom
 326        && destx >= 0
 327        && destx + width <= ctx->DrawBuffer->Width) {
 328       quick_draw = GL_TRUE;
 329    }
 330    else {
 331       quick_draw = GL_FALSE;
 332    }
 333
 334    /* If read and draw buffer are different we must do buffer switching */
 335    saveReadAlpha = ctx->ReadBuffer->Alpha;
 336    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 337                   || ctx->DrawBuffer != ctx->ReadBuffer;
 338
 339    (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 340                                  ctx->Pixel.DriverReadBuffer );
 341
 342    if (overlapping) {
 343       GLint ssy = sy;
 344       tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
 345       if (!tmpImage) {
 346          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 347          return;
 348       }
 349       p = tmpImage;
 350       if (changeBuffer) {
 351          (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 352                                        ctx->Pixel.DriverReadBuffer );
 353          if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
 354             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 355          else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
 356             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 357          else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
 358             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 359          else
 360             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 361       }
 362       for (j = 0; j < height; j++, ssy += stepy) {
 363          gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, ssy,
 364                             (GLchan (*)[4]) p );
 365          p += (width * sizeof(GLchan) * 4);
 366       }
 367       p = tmpImage;
 368    }
 369    else {
 370       tmpImage = NULL;  /* silence compiler warnings */
 371       p = NULL;
 372    }
 373
 374    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 375       /* Get source pixels */
 376       if (overlapping) {
 377          /* get from buffered image */
 378          MEMCPY(rgba, p, width * sizeof(GLchan) * 4);
 379          p += (width * sizeof(GLchan) * 4);
 380       }
 381       else {
 382          /* get from framebuffer */
 383          if (changeBuffer) {
 384             (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 385                                           ctx->Pixel.DriverReadBuffer );
 386             if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT) {
 387                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 388             }
 389             else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT) {
 390                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 391             }
 392             else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT) {
 393                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 394             }
 395             else {
 396                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 397             }
 398          }
 399          gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, sy, rgba );
 400       }
 401
 402       if (changeBuffer) {
 403          /* read from the draw buffer again (in case of blending) */
 404          (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 405                                        ctx->Color.DriverDrawBuffer );
 406          ctx->ReadBuffer->Alpha = saveReadAlpha;
 407       }
 408
 409       if (transferOps) {
 410          const GLfloat scale = (1.0F / CHAN_MAXF);
 411          GLfloat rgbaFloat[MAX_WIDTH][4];
 412          GLuint k;
 413          /* convert chan to float */
 414          for (k = 0; k < width; k++) {
 415             rgbaFloat[k][RCOMP] = (GLfloat) rgba[k][RCOMP] * scale;
 416             rgbaFloat[k][GCOMP] = (GLfloat) rgba[k][GCOMP] * scale;
 417             rgbaFloat[k][BCOMP] = (GLfloat) rgba[k][BCOMP] * scale;
 418             rgbaFloat[k][ACOMP] = (GLfloat) rgba[k][ACOMP] * scale;
 419          }
 420          /* scale & bias */
 421          if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 422             _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat,
 423                                    ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 424                                    ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 425                                    ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 426                                    ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 427          }
 428          /* color map lookup */
 429          if (transferOps & IMAGE_MAP_COLOR_BIT) {
 430             _mesa_map_rgba(ctx, width, rgbaFloat);
 431          }
 432          /* GL_COLOR_TABLE lookup */
 433          if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 434             _mesa_lookup_rgba(&ctx->ColorTable, width, rgbaFloat);
 435          }
 436          /* convolution */
 437          if (transferOps & IMAGE_CONVOLUTION_BIT) {
 438             /* XXX to do */
 439          }
 440          /* GL_POST_CONVOLUTION_RED/GREEN/BLUE/ALPHA_SCALE/BIAS */
 441          if (transferOps & IMAGE_POST_CONVOLUTION_SCALE_BIAS) {
 442             _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat,
 443                                       ctx->Pixel.PostConvolutionScale[RCOMP],
 444                                       ctx->Pixel.PostConvolutionScale[GCOMP],
 445                                       ctx->Pixel.PostConvolutionScale[BCOMP],
 446                                       ctx->Pixel.PostConvolutionScale[ACOMP],
 447                                       ctx->Pixel.PostConvolutionBias[RCOMP],
 448                                       ctx->Pixel.PostConvolutionBias[GCOMP],
 449                                       ctx->Pixel.PostConvolutionBias[BCOMP],
 450                                       ctx->Pixel.PostConvolutionBias[ACOMP]);
 451          }
 452          /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 453          if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 454             _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgbaFloat);
 455          }
 456          /* color matrix */
 457          if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 458             _mesa_transform_rgba(ctx, width, rgbaFloat);
 459          }
 460          /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 461          if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 462             _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgbaFloat);
 463          }
 464          /* update histogram count */
 465          if (transferOps & IMAGE_HISTOGRAM_BIT) {
 466             _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 467          }
 468          /* update min/max */
 469          if (transferOps & IMAGE_MIN_MAX_BIT) {
 470             _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 471          }
 472          /* clamp to [0,1] and convert float back to chan */
 473          for (k = 0; k < width; k++) {
 474             GLint r = (GLint) (rgbaFloat[k][RCOMP] * CHAN_MAXF);
 475             GLint g = (GLint) (rgbaFloat[k][GCOMP] * CHAN_MAXF);
 476             GLint b = (GLint) (rgbaFloat[k][BCOMP] * CHAN_MAXF);
 477             GLint a = (GLint) (rgbaFloat[k][ACOMP] * CHAN_MAXF);
 478             rgba[k][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 479             rgba[k][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 480             rgba[k][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 481             rgba[k][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 482          }
 483       }
 484
 485       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 486          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 487          GLchan primary_rgba[MAX_WIDTH][4];
 488          GLuint unit;
 489          /* XXX not sure how multitexture is supposed to work here */
 490
 491          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 492
 493          for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
 494             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 495                               s, t, r, q);
 496             _swrast_texture_fragments(ctx, unit, width, s, t, r, NULL,
 497                                       primary_rgba, rgba);
 498          }
 499       }
 500
 501       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 502          (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 503                                        (const GLchan (*)[4])rgba, NULL );
 504       }
 505       else if (zoom) {
 506          gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 507                                     (const GLchan (*)[4])rgba, desty);
 508       }
 509       else {
 510          gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
 511       }
 512    }
 513
 514    /* Restore pixel source to be the draw buffer (for blending, etc) */
 515    (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 516                                  ctx->Color.DriverDrawBuffer );
 517
 518    if (overlapping)
 519       FREE(tmpImage);
 520 }
 521
 522
 523 static void copy_ci_pixels( GLcontext *ctx,
 524                             GLint srcx, GLint srcy, GLint width, GLint height,
 525                             GLint destx, GLint desty )
 526 {
 527    GLdepth zspan[MAX_WIDTH];
 528    GLuint *tmpImage,*p;
 529    GLint sy, dy, stepy;
 530    GLint i, j;
 531    GLboolean changeBuffer;
 532    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 533    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 534    GLint overlapping;
 535
 536    /* Determine if copy should be bottom-to-top or top-to-bottom */
 537    if (srcy<desty) {
 538       /* top-down  max-to-min */
 539       sy = srcy + height - 1;
 540       dy = desty + height - 1;
 541       stepy = -1;
 542    }
 543    else {
 544       /* bottom-up  min-to-max */
 545       sy = srcy;
 546       dy = desty;
 547       stepy = 1;
 548    }
 549
 550    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 551                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 552
 553    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 554       /* fill in array of z values */
 555       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
 556       for (i=0;i<width;i++) {
 557          zspan[i] = z;
 558       }
 559    }
 560
 561    /* If read and draw buffer are different we must do buffer switching */
 562    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 563                || ctx->DrawBuffer != ctx->ReadBuffer;
 564
 565    (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 566                                  ctx->Pixel.DriverReadBuffer );
 567
 568    if (overlapping) {
 569       GLint ssy = sy;
 570       tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
 571       if (!tmpImage) {
 572          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 573          return;
 574       }
 575       p = tmpImage;
 576       if (changeBuffer) {
 577          (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 578                                        ctx->Pixel.DriverReadBuffer );
 579       }
 580       for (j = 0; j < height; j++, ssy += stepy) {
 581          gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, ssy, p );
 582          p += width;
 583       }
 584       p = tmpImage;
 585    }
 586    else {
 587       tmpImage = NULL;  /* silence compiler warning */
 588       p = NULL;
 589    }
 590
 591    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 592       GLuint indexes[MAX_WIDTH];
 593       if (overlapping) {
 594          MEMCPY(indexes, p, width * sizeof(GLuint));
 595          p += width;
 596       }
 597       else {
 598          if (changeBuffer) {
 599             (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 600                                           ctx->Pixel.DriverReadBuffer );
 601          }
 602          gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, sy, indexes );
 603       }
 604
 605       if (changeBuffer) {
 606          /* set read buffer back to draw buffer (in case of logicops) */
 607          (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 608                                        ctx->Color.DriverDrawBuffer );
 609       }
 610
 611       if (shift_or_offset) {
 612          _mesa_shift_and_offset_ci( ctx, width, indexes );
 613       }
 614       if (ctx->Pixel.MapColorFlag) {
 615          _mesa_map_ci( ctx, width, indexes );
 616       }
 617
 618       if (zoom) {
 619          gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, 0, indexes, desty );
 620       }
 621       else {
 622          gl_write_index_span(ctx, width, destx, dy, zspan, 0, indexes, GL_BITMAP);
 623       }
 624    }
 625
 626    /* Restore pixel source to be the draw buffer (for blending, etc) */
 627    (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 628                                  ctx->Color.DriverDrawBuffer );
 629
 630    if (overlapping)
 631       FREE(tmpImage);
 632 }
 633
 634
 635
 636 /*
 637  * TODO: Optimize!!!!
 638  */
 639 static void copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 640                                GLint width, GLint height,
 641                                GLint destx, GLint desty )
 642 {
 643    GLfloat depth[MAX_WIDTH];
 644    GLdepth zspan[MAX_WIDTH];
 645    GLfloat *p, *tmpImage;
 646    GLuint indexes[MAX_WIDTH];
 647    GLchan rgba[MAX_WIDTH][4];
 648    GLint sy, dy, stepy;
 649    GLint i, j;
 650    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 651    GLint overlapping;
 652
 653    if (!ctx->Visual.DepthBits) {
 654       gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 655       return;
 656    }
 657
 658    /* Determine if copy should be bottom-to-top or top-to-bottom */
 659    if (srcy<desty) {
 660       /* top-down  max-to-min */
 661       sy = srcy + height - 1;
 662       dy = desty + height - 1;
 663       stepy = -1;
 664    }
 665    else {
 666       /* bottom-up  min-to-max */
 667       sy = srcy;
 668       dy = desty;
 669       stepy = 1;
 670    }
 671
 672    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 673                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 674
 675    /* setup colors or indexes */
 676    if (ctx->Visual.RGBAflag) {
 677       GLuint *rgba32 = (GLuint *) rgba;
 678       GLuint color = *(GLuint*)( ctx->Current.Color );
 679       for (i = 0; i < width; i++) {
 680          rgba32[i] = color;
 681       }
 682    }
 683    else {
 684       for (i = 0; i < width; i++) {
 685          indexes[i] = ctx->Current.Index;
 686       }
 687    }
 688
 689    if (overlapping) {
 690       GLint ssy = sy;
 691       tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
 692       if (!tmpImage) {
 693          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 694          return;
 695       }
 696       p = tmpImage;
 697       for (j = 0; j < height; j++, ssy += stepy) {
 698          _mesa_read_depth_span_float(ctx, width, srcx, ssy, p);
 699          p += width;
 700       }
 701       p = tmpImage;
 702    }
 703    else {
 704       tmpImage = NULL;  /* silence compiler warning */
 705       p = NULL;
 706    }
 707
 708    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 709       if (overlapping) {
 710          MEMCPY(depth, p, width * sizeof(GLfloat));
 711          p += width;
 712       }
 713       else {
 714          _mesa_read_depth_span_float(ctx, width, srcx, sy, depth);
 715       }
 716
 717       for (i = 0; i < width; i++) {
 718          GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
 719          zspan[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * ctx->Visual.DepthMax);
 720       }
 721
 722       if (ctx->Visual.RGBAflag) {
 723          if (zoom) {
 724             gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 725                                        (const GLchan (*)[4])rgba, desty );
 726          }
 727          else {
 728             gl_write_rgba_span( ctx, width, destx, dy, zspan, 0,
 729                                 rgba, GL_BITMAP);
 730          }
 731       }
 732       else {
 733          if (zoom) {
 734             gl_write_zoomed_index_span( ctx, width, destx, dy,
 735                                         zspan, 0, indexes, desty );
 736          }
 737          else {
 738             gl_write_index_span( ctx, width, destx, dy,
 739                                  zspan, 0, indexes, GL_BITMAP );
 740          }
 741       }
 742    }
 743
 744   if (overlapping)
 745      FREE(tmpImage);
 746 }
 747
 748
 749
 750 static void copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 751                                  GLint width, GLint height,
 752                                  GLint destx, GLint desty )
 753 {
 754    GLint sy, dy, stepy;
 755    GLint j;
 756    GLstencil *p, *tmpImage;
 757    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 758    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 759    GLint overlapping;
 760
 761    if (!ctx->Visual.StencilBits) {
 762       gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 763       return;
 764    }
 765
 766    /* Determine if copy should be bottom-to-top or top-to-bottom */
 767    if (srcy < desty) {
 768       /* top-down  max-to-min */
 769       sy = srcy + height - 1;
 770       dy = desty + height - 1;
 771       stepy = -1;
 772    }
 773    else {
 774       /* bottom-up  min-to-max */
 775       sy = srcy;
 776       dy = desty;
 777       stepy = 1;
 778    }
 779
 780    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 781                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 782
 783    if (overlapping) {
 784       GLint ssy = sy;
 785       tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
 786       if (!tmpImage) {
 787          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 788          return;
 789       }
 790       p = tmpImage;
 791       for (j = 0; j < height; j++, ssy += stepy) {
 792          _mesa_read_stencil_span( ctx, width, srcx, ssy, p );
 793          p += width;
 794       }
 795       p = tmpImage;
 796    }
 797    else {
 798       tmpImage = NULL;  /* silence compiler warning */
 799       p = NULL;
 800    }
 801
 802    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 803       GLstencil stencil[MAX_WIDTH];
 804
 805       if (overlapping) {
 806          MEMCPY(stencil, p, width * sizeof(GLstencil));
 807          p += width;
 808       }
 809       else {
 810          _mesa_read_stencil_span( ctx, width, srcx, sy, stencil );
 811       }
 812
 813       if (shift_or_offset) {
 814          _mesa_shift_and_offset_stencil( ctx, width, stencil );
 815       }
 816       if (ctx->Pixel.MapStencilFlag) {
 817          _mesa_map_stencil( ctx, width, stencil );
 818       }
 819
 820       if (zoom) {
 821          gl_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
 822       }
 823       else {
 824          _mesa_write_stencil_span( ctx, width, destx, dy, stencil );
 825       }
 826    }
 827
 828    if (overlapping)
 829       FREE(tmpImage);
 830 }
 831
 832
 833
 834
 835 void
 836 _swrast_CopyPixels( GLcontext *ctx,
 837                     GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 838                     GLint destx, GLint desty,
 839                     GLenum type )
 840 {
 841    if (SWRAST_CONTEXT(ctx)->NewState)
 842       _swrast_validate_derived( ctx );
 843
 844    if (type == GL_COLOR && ctx->Visual.RGBAflag) {
 845       copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
 846    }
 847    else if (type == GL_COLOR && !ctx->Visual.RGBAflag) {
 848       copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
 849    }
 850    else if (type == GL_DEPTH) {
 851       copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
 852    }
 853    else if (type == GL_STENCIL) {
 854       copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
 855    }
 856    else {
 857       gl_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
 858    }
 859 }