src/mesa/swrast/s_copypix.c

   1 /* $Id: s_copypix.c,v 1.14 2001/03/07 05:06:12 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  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  * This test also compensates for the fact that copies are done from
  52  * bottom to top and overlaps can sometimes be handled correctly
  53  * without making a temporary image copy.
  54  */
  55 static GLboolean
  56 regions_overlap(GLint srcx, GLint srcy,
  57                 GLint dstx, GLint dsty,
  58                 GLint width, GLint height,
  59                 GLfloat zoomX, GLfloat zoomY)
  60 {
  61    if (zoomX == 1.0 && zoomY == 1.0) {
  62       /* no zoom */
  63       if (srcx >= dstx + width || (srcx + width <= dstx)) {
  64          return GL_FALSE;
  65       }
  66       else if (srcy < dsty) { /* this is OK */
  67          return GL_FALSE;
  68       }
  69       else {
  70          return GL_TRUE;
  71       }
  72    }
  73    else {
  74       /* add one pixel of slop when zooming, just to be safe */
  75       if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
  76          return GL_FALSE;
  77       }
  78       else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
  79          return GL_FALSE;
  80       }
  81       else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
  82          return GL_FALSE;
  83       }
  84       else {
  85          return GL_TRUE;
  86       }
  87    }
  88 }
  89
  90
  91
  92 /*
  93  * RGBA copypixels with convolution.
  94  */
  95 static void
  96 copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
  97                       GLint width, GLint height, GLint destx, GLint desty)
  98 {
  99    GLdepth zspan[MAX_WIDTH];
 100    GLboolean quick_draw;
 101    GLint row;
 102    GLboolean changeBuffer;
 103    GLchan *saveReadAlpha;
 104    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 105    const GLuint transferOps = ctx->_ImageTransferState;
 106    GLfloat *dest, *tmpImage, *convImage;
 107
 108    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 109       /* fill in array of z values */
 110       GLdepth z = (GLdepth)
 111          (ctx->Current.RasterPos[2] * ctx->DepthMax);
 112       GLint i;
 113       for (i = 0; i < width; i++) {
 114          zspan[i] = z;
 115       }
 116    }
 117
 118    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
 119        && !zoom
 120        && destx >= 0
 121        && destx + width <= ctx->DrawBuffer->Width) {
 122       quick_draw = GL_TRUE;
 123    }
 124    else {
 125       quick_draw = GL_FALSE;
 126    }
 127
 128    /* If read and draw buffer are different we must do buffer switching */
 129    saveReadAlpha = ctx->ReadBuffer->Alpha;
 130    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 131                || ctx->DrawBuffer != ctx->ReadBuffer;
 132
 133
 134    /* allocate space for GLfloat image */
 135    tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 136    if (!tmpImage) {
 137       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 138       return;
 139    }
 140    convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 141    if (!convImage) {
 142       FREE(tmpImage);
 143       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 144       return;
 145    }
 146
 147    dest = tmpImage;
 148
 149    if (changeBuffer) {
 150       (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 151                                     ctx->Pixel.DriverReadBuffer );
 152       if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
 153          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 154       else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
 155          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 156       else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
 157          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 158       else
 159          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 160    }
 161
 162    /* read source image */
 163    dest = tmpImage;
 164    for (row = 0; row < height; row++) {
 165       GLchan rgba[MAX_WIDTH][4];
 166       GLint i;
 167       _mesa_read_rgba_span(ctx, ctx->ReadBuffer, width, srcx, srcy + row, rgba);
 168       /* convert GLchan to GLfloat */
 169       for (i = 0; i < width; i++) {
 170          *dest++ = (GLfloat) rgba[i][RCOMP] * (1.0F / CHAN_MAXF);
 171          *dest++ = (GLfloat) rgba[i][GCOMP] * (1.0F / CHAN_MAXF);
 172          *dest++ = (GLfloat) rgba[i][BCOMP] * (1.0F / CHAN_MAXF);
 173          *dest++ = (GLfloat) rgba[i][ACOMP] * (1.0F / CHAN_MAXF);
 174       }
 175    }
 176
 177    /* read from the draw buffer again (in case of blending) */
 178    if (changeBuffer) {
 179       (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 180                                     ctx->Color.DriverDrawBuffer );
 181       ctx->ReadBuffer->Alpha = saveReadAlpha;
 182    }
 183
 184    /* do image transfer ops up until convolution */
 185    for (row = 0; row < height; row++) {
 186       GLfloat (*rgba)[4] = (GLfloat (*)[4]) tmpImage + row * width * 4;
 187
 188       /* scale & bias */
 189       if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 190          _mesa_scale_and_bias_rgba(ctx, width, rgba,
 191                                    ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 192                                    ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 193                                    ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 194                                    ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 195       }
 196       /* color map lookup */
 197       if (transferOps & IMAGE_MAP_COLOR_BIT) {
 198          _mesa_map_rgba(ctx, width, rgba);
 199       }
 200       /* GL_COLOR_TABLE lookup */
 201       if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 202          _mesa_lookup_rgba(&ctx->ColorTable, width, rgba);
 203       }
 204    }
 205
 206    /* do convolution */
 207    if (ctx->Pixel.Convolution2DEnabled) {
 208       _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 209    }
 210    else {
 211       ASSERT(ctx->Pixel.Separable2DEnabled);
 212       _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 213    }
 214    FREE(tmpImage);
 215
 216    /* do remaining image transfer ops */
 217    for (row = 0; row < height; row++) {
 218       GLfloat (*rgba)[4] = (GLfloat (*)[4]) convImage + row * width * 4;
 219
 220       /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 221       if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 222          _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgba);
 223       }
 224       /* color matrix */
 225       if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 226          _mesa_transform_rgba(ctx, width, rgba);
 227       }
 228       /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 229       if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 230          _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgba);
 231       }
 232       /* update histogram count */
 233       if (transferOps & IMAGE_HISTOGRAM_BIT) {
 234          _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgba);
 235       }
 236       /* update min/max */
 237       if (transferOps & IMAGE_MIN_MAX_BIT) {
 238          _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgba);
 239       }
 240    }
 241
 242    for (row = 0; row < height; row++) {
 243       const GLfloat *src = convImage + row * width * 4;
 244       GLchan rgba[MAX_WIDTH][4];
 245       GLint i, dy;
 246
 247       /* clamp to [0,1] and convert float back to chan */
 248       for (i = 0; i < width; i++) {
 249          GLint r = (GLint) (src[i * 4 + RCOMP] * CHAN_MAXF);
 250          GLint g = (GLint) (src[i * 4 + GCOMP] * CHAN_MAXF);
 251          GLint b = (GLint) (src[i * 4 + BCOMP] * CHAN_MAXF);
 252          GLint a = (GLint) (src[i * 4 + ACOMP] * CHAN_MAXF);
 253          rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 254          rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 255          rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 256          rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 257       }
 258
 259       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 260          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 261          GLchan primary_rgba[MAX_WIDTH][4];
 262          GLuint unit;
 263          /* XXX not sure how multitexture is supposed to work here */
 264
 265          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 266
 267          for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
 268             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 269                               s, t, r, q);
 270             _swrast_texture_fragments(ctx, unit, width, s, t, r, NULL,
 271                                       (CONST GLchan (*)[4]) primary_rgba,
 272                                       rgba);
 273          }
 274       }
 275
 276       /* write row to framebuffer */
 277
 278       dy = desty + row;
 279       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 280          (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 281                                        (const GLchan (*)[4])rgba, NULL );
 282       }
 283       else if (zoom) {
 284          _mesa_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 285                                     (const GLchan (*)[4])rgba, desty);
 286       }
 287       else {
 288          _mesa_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
 289       }
 290    }
 291
 292    FREE(convImage);
 293 }
 294
 295
 296 /*
 297  * RGBA copypixels
 298  */
 299 static void
 300 copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 301                  GLint width, GLint height, GLint destx, GLint desty)
 302 {
 303    GLdepth zspan[MAX_WIDTH];
 304    GLchan rgba[MAX_WIDTH][4];
 305    GLchan *tmpImage,*p;
 306    GLboolean quick_draw;
 307    GLint sy, dy, stepy;
 308    GLint i, j;
 309    GLboolean changeBuffer;
 310    GLchan *saveReadAlpha;
 311    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 312    GLint overlapping;
 313    const GLuint transferOps = ctx->_ImageTransferState;
 314
 315    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 316       copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
 317       return;
 318    }
 319
 320    /* Determine if copy should be done bottom-to-top or top-to-bottom */
 321    if (srcy < desty) {
 322       /* top-down  max-to-min */
 323       sy = srcy + height - 1;
 324       dy = desty + height - 1;
 325       stepy = -1;
 326    }
 327    else {
 328       /* bottom-up  min-to-max */
 329       sy = srcy;
 330       dy = desty;
 331       stepy = 1;
 332    }
 333
 334    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 335                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 336
 337    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 338       /* fill in array of z values */
 339       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->DepthMax);
 340       for (i=0;i<width;i++) {
 341          zspan[i] = z;
 342       }
 343    }
 344
 345    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
 346        && !zoom
 347        && destx >= 0
 348        && destx + width <= ctx->DrawBuffer->Width) {
 349       quick_draw = GL_TRUE;
 350    }
 351    else {
 352       quick_draw = GL_FALSE;
 353    }
 354
 355    /* If read and draw buffer are different we must do buffer switching */
 356    saveReadAlpha = ctx->ReadBuffer->Alpha;
 357    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 358                   || ctx->DrawBuffer != ctx->ReadBuffer;
 359
 360    (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 361                                  ctx->Pixel.DriverReadBuffer );
 362
 363    if (overlapping) {
 364       GLint ssy = sy;
 365       tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
 366       if (!tmpImage) {
 367          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 368          return;
 369       }
 370       p = tmpImage;
 371       if (changeBuffer) {
 372          (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 373                                        ctx->Pixel.DriverReadBuffer );
 374          if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
 375             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 376          else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
 377             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 378          else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
 379             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 380          else
 381             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 382       }
 383       for (j = 0; j < height; j++, ssy += stepy) {
 384          _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, ssy,
 385                             (GLchan (*)[4]) p );
 386          p += (width * sizeof(GLchan) * 4);
 387       }
 388       p = tmpImage;
 389    }
 390    else {
 391       tmpImage = NULL;  /* silence compiler warnings */
 392       p = NULL;
 393    }
 394
 395    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 396       /* Get source pixels */
 397       if (overlapping) {
 398          /* get from buffered image */
 399          MEMCPY(rgba, p, width * sizeof(GLchan) * 4);
 400          p += (width * sizeof(GLchan) * 4);
 401       }
 402       else {
 403          /* get from framebuffer */
 404          if (changeBuffer) {
 405             (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 406                                           ctx->Pixel.DriverReadBuffer );
 407             if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT) {
 408                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 409             }
 410             else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT) {
 411                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 412             }
 413             else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT) {
 414                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 415             }
 416             else {
 417                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 418             }
 419          }
 420          _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, sy, rgba );
 421       }
 422
 423       if (changeBuffer) {
 424          /* read from the draw buffer again (in case of blending) */
 425          (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 426                                        ctx->Color.DriverDrawBuffer );
 427          ctx->ReadBuffer->Alpha = saveReadAlpha;
 428       }
 429
 430       if (transferOps) {
 431          const GLfloat scale = (1.0F / CHAN_MAXF);
 432          GLfloat rgbaFloat[MAX_WIDTH][4];
 433          GLint k;
 434          /* convert chan to float */
 435          for (k = 0; k < width; k++) {
 436             rgbaFloat[k][RCOMP] = (GLfloat) rgba[k][RCOMP] * scale;
 437             rgbaFloat[k][GCOMP] = (GLfloat) rgba[k][GCOMP] * scale;
 438             rgbaFloat[k][BCOMP] = (GLfloat) rgba[k][BCOMP] * scale;
 439             rgbaFloat[k][ACOMP] = (GLfloat) rgba[k][ACOMP] * scale;
 440          }
 441          /* scale & bias */
 442          if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 443             _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat,
 444                                    ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 445                                    ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 446                                    ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 447                                    ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 448          }
 449          /* color map lookup */
 450          if (transferOps & IMAGE_MAP_COLOR_BIT) {
 451             _mesa_map_rgba(ctx, width, rgbaFloat);
 452          }
 453          /* GL_COLOR_TABLE lookup */
 454          if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 455             _mesa_lookup_rgba(&ctx->ColorTable, width, rgbaFloat);
 456          }
 457          /* convolution */
 458          if (transferOps & IMAGE_CONVOLUTION_BIT) {
 459             /* XXX to do */
 460          }
 461          /* GL_POST_CONVOLUTION_RED/GREEN/BLUE/ALPHA_SCALE/BIAS */
 462          if (transferOps & IMAGE_POST_CONVOLUTION_SCALE_BIAS) {
 463             _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat,
 464                                       ctx->Pixel.PostConvolutionScale[RCOMP],
 465                                       ctx->Pixel.PostConvolutionScale[GCOMP],
 466                                       ctx->Pixel.PostConvolutionScale[BCOMP],
 467                                       ctx->Pixel.PostConvolutionScale[ACOMP],
 468                                       ctx->Pixel.PostConvolutionBias[RCOMP],
 469                                       ctx->Pixel.PostConvolutionBias[GCOMP],
 470                                       ctx->Pixel.PostConvolutionBias[BCOMP],
 471                                       ctx->Pixel.PostConvolutionBias[ACOMP]);
 472          }
 473          /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 474          if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 475             _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgbaFloat);
 476          }
 477          /* color matrix */
 478          if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 479             _mesa_transform_rgba(ctx, width, rgbaFloat);
 480          }
 481          /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 482          if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 483             _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgbaFloat);
 484          }
 485          /* update histogram count */
 486          if (transferOps & IMAGE_HISTOGRAM_BIT) {
 487             _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 488          }
 489          /* update min/max */
 490          if (transferOps & IMAGE_MIN_MAX_BIT) {
 491             _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 492          }
 493          /* clamp to [0,1] and convert float back to chan */
 494          for (k = 0; k < width; k++) {
 495             GLint r = (GLint) (rgbaFloat[k][RCOMP] * CHAN_MAXF);
 496             GLint g = (GLint) (rgbaFloat[k][GCOMP] * CHAN_MAXF);
 497             GLint b = (GLint) (rgbaFloat[k][BCOMP] * CHAN_MAXF);
 498             GLint a = (GLint) (rgbaFloat[k][ACOMP] * CHAN_MAXF);
 499             rgba[k][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 500             rgba[k][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 501             rgba[k][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 502             rgba[k][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 503          }
 504       }
 505
 506       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 507          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 508          GLchan primary_rgba[MAX_WIDTH][4];
 509          GLuint unit;
 510          /* XXX not sure how multitexture is supposed to work here */
 511
 512          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 513
 514          for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
 515             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 516                               s, t, r, q);
 517             _swrast_texture_fragments(ctx, unit, width, s, t, r, NULL,
 518                                       (CONST GLchan (*)[4]) primary_rgba,
 519                                       rgba);
 520          }
 521       }
 522
 523       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 524          (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 525                                        (const GLchan (*)[4])rgba, NULL );
 526       }
 527       else if (zoom) {
 528          _mesa_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 529                                     (const GLchan (*)[4])rgba, desty);
 530       }
 531       else {
 532          _mesa_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
 533       }
 534    }
 535
 536    /* Restore pixel source to be the draw buffer (for blending, etc) */
 537    (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 538                                  ctx->Color.DriverDrawBuffer );
 539
 540    if (overlapping)
 541       FREE(tmpImage);
 542 }
 543
 544
 545 static void copy_ci_pixels( GLcontext *ctx,
 546                             GLint srcx, GLint srcy, GLint width, GLint height,
 547                             GLint destx, GLint desty )
 548 {
 549    GLdepth zspan[MAX_WIDTH];
 550    GLuint *tmpImage,*p;
 551    GLint sy, dy, stepy;
 552    GLint i, j;
 553    GLboolean changeBuffer;
 554    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 555    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 556    GLint overlapping;
 557
 558    /* Determine if copy should be bottom-to-top or top-to-bottom */
 559    if (srcy<desty) {
 560       /* top-down  max-to-min */
 561       sy = srcy + height - 1;
 562       dy = desty + height - 1;
 563       stepy = -1;
 564    }
 565    else {
 566       /* bottom-up  min-to-max */
 567       sy = srcy;
 568       dy = desty;
 569       stepy = 1;
 570    }
 571
 572    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 573                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 574
 575    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 576       /* fill in array of z values */
 577       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->DepthMax);
 578       for (i=0;i<width;i++) {
 579          zspan[i] = z;
 580       }
 581    }
 582
 583    /* If read and draw buffer are different we must do buffer switching */
 584    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 585                || ctx->DrawBuffer != ctx->ReadBuffer;
 586
 587    (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 588                                  ctx->Pixel.DriverReadBuffer );
 589
 590    if (overlapping) {
 591       GLint ssy = sy;
 592       tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
 593       if (!tmpImage) {
 594          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 595          return;
 596       }
 597       p = tmpImage;
 598       if (changeBuffer) {
 599          (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 600                                        ctx->Pixel.DriverReadBuffer );
 601       }
 602       for (j = 0; j < height; j++, ssy += stepy) {
 603          _mesa_read_index_span( ctx, ctx->ReadBuffer, width, srcx, ssy, p );
 604          p += width;
 605       }
 606       p = tmpImage;
 607    }
 608    else {
 609       tmpImage = NULL;  /* silence compiler warning */
 610       p = NULL;
 611    }
 612
 613    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 614       GLuint indexes[MAX_WIDTH];
 615       if (overlapping) {
 616          MEMCPY(indexes, p, width * sizeof(GLuint));
 617          p += width;
 618       }
 619       else {
 620          if (changeBuffer) {
 621             (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 622                                           ctx->Pixel.DriverReadBuffer );
 623          }
 624          _mesa_read_index_span( ctx, ctx->ReadBuffer, width, srcx, sy, indexes );
 625       }
 626
 627       if (changeBuffer) {
 628          /* set read buffer back to draw buffer (in case of logicops) */
 629          (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 630                                        ctx->Color.DriverDrawBuffer );
 631       }
 632
 633       if (shift_or_offset) {
 634          _mesa_shift_and_offset_ci( ctx, width, indexes );
 635       }
 636       if (ctx->Pixel.MapColorFlag) {
 637          _mesa_map_ci( ctx, width, indexes );
 638       }
 639
 640       if (zoom) {
 641          _mesa_write_zoomed_index_span( ctx, width, destx, dy, zspan, 0, indexes, desty );
 642       }
 643       else {
 644          _mesa_write_index_span(ctx, width, destx, dy, zspan, 0, indexes, GL_BITMAP);
 645       }
 646    }
 647
 648    /* Restore pixel source to be the draw buffer (for blending, etc) */
 649    (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 650                                  ctx->Color.DriverDrawBuffer );
 651
 652    if (overlapping)
 653       FREE(tmpImage);
 654 }
 655
 656
 657
 658 /*
 659  * TODO: Optimize!!!!
 660  */
 661 static void copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 662                                GLint width, GLint height,
 663                                GLint destx, GLint desty )
 664 {
 665    GLfloat depth[MAX_WIDTH];
 666    GLdepth zspan[MAX_WIDTH];
 667    GLfloat *p, *tmpImage;
 668    GLuint indexes[MAX_WIDTH];
 669    GLchan rgba[MAX_WIDTH][4];
 670    GLint sy, dy, stepy;
 671    GLint i, j;
 672    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 673    GLint overlapping;
 674
 675    if (!ctx->Visual.depthBits) {
 676       _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 677       return;
 678    }
 679
 680    /* Determine if copy should be bottom-to-top or top-to-bottom */
 681    if (srcy<desty) {
 682       /* top-down  max-to-min */
 683       sy = srcy + height - 1;
 684       dy = desty + height - 1;
 685       stepy = -1;
 686    }
 687    else {
 688       /* bottom-up  min-to-max */
 689       sy = srcy;
 690       dy = desty;
 691       stepy = 1;
 692    }
 693
 694    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 695                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 696
 697    /* setup colors or indexes */
 698    if (ctx->Visual.rgbMode) {
 699       GLuint *rgba32 = (GLuint *) rgba;
 700       GLuint color = *(GLuint*)( ctx->Current.Color );
 701       for (i = 0; i < width; i++) {
 702          rgba32[i] = color;
 703       }
 704    }
 705    else {
 706       for (i = 0; i < width; i++) {
 707          indexes[i] = ctx->Current.Index;
 708       }
 709    }
 710
 711    if (overlapping) {
 712       GLint ssy = sy;
 713       tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
 714       if (!tmpImage) {
 715          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 716          return;
 717       }
 718       p = tmpImage;
 719       for (j = 0; j < height; j++, ssy += stepy) {
 720          _mesa_read_depth_span_float(ctx, width, srcx, ssy, p);
 721          p += width;
 722       }
 723       p = tmpImage;
 724    }
 725    else {
 726       tmpImage = NULL;  /* silence compiler warning */
 727       p = NULL;
 728    }
 729
 730    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 731       if (overlapping) {
 732          MEMCPY(depth, p, width * sizeof(GLfloat));
 733          p += width;
 734       }
 735       else {
 736          _mesa_read_depth_span_float(ctx, width, srcx, sy, depth);
 737       }
 738
 739       for (i = 0; i < width; i++) {
 740          GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
 741          zspan[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * ctx->DepthMax);
 742       }
 743
 744       if (ctx->Visual.rgbMode) {
 745          if (zoom) {
 746             _mesa_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 747                                        (const GLchan (*)[4])rgba, desty );
 748          }
 749          else {
 750             _mesa_write_rgba_span( ctx, width, destx, dy, zspan, 0,
 751                                 rgba, GL_BITMAP);
 752          }
 753       }
 754       else {
 755          if (zoom) {
 756             _mesa_write_zoomed_index_span( ctx, width, destx, dy,
 757                                         zspan, 0, indexes, desty );
 758          }
 759          else {
 760             _mesa_write_index_span( ctx, width, destx, dy,
 761                                  zspan, 0, indexes, GL_BITMAP );
 762          }
 763       }
 764    }
 765
 766   if (overlapping)
 767      FREE(tmpImage);
 768 }
 769
 770
 771
 772 static void copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 773                                  GLint width, GLint height,
 774                                  GLint destx, GLint desty )
 775 {
 776    GLint sy, dy, stepy;
 777    GLint j;
 778    GLstencil *p, *tmpImage;
 779    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 780    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 781    GLint overlapping;
 782
 783    if (!ctx->Visual.stencilBits) {
 784       _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 785       return;
 786    }
 787
 788    /* Determine if copy should be bottom-to-top or top-to-bottom */
 789    if (srcy < desty) {
 790       /* top-down  max-to-min */
 791       sy = srcy + height - 1;
 792       dy = desty + height - 1;
 793       stepy = -1;
 794    }
 795    else {
 796       /* bottom-up  min-to-max */
 797       sy = srcy;
 798       dy = desty;
 799       stepy = 1;
 800    }
 801
 802    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 803                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 804
 805    if (overlapping) {
 806       GLint ssy = sy;
 807       tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
 808       if (!tmpImage) {
 809          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 810          return;
 811       }
 812       p = tmpImage;
 813       for (j = 0; j < height; j++, ssy += stepy) {
 814          _mesa_read_stencil_span( ctx, width, srcx, ssy, p );
 815          p += width;
 816       }
 817       p = tmpImage;
 818    }
 819    else {
 820       tmpImage = NULL;  /* silence compiler warning */
 821       p = NULL;
 822    }
 823
 824    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 825       GLstencil stencil[MAX_WIDTH];
 826
 827       if (overlapping) {
 828          MEMCPY(stencil, p, width * sizeof(GLstencil));
 829          p += width;
 830       }
 831       else {
 832          _mesa_read_stencil_span( ctx, width, srcx, sy, stencil );
 833       }
 834
 835       if (shift_or_offset) {
 836          _mesa_shift_and_offset_stencil( ctx, width, stencil );
 837       }
 838       if (ctx->Pixel.MapStencilFlag) {
 839          _mesa_map_stencil( ctx, width, stencil );
 840       }
 841
 842       if (zoom) {
 843          _mesa_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
 844       }
 845       else {
 846          _mesa_write_stencil_span( ctx, width, destx, dy, stencil );
 847       }
 848    }
 849
 850    if (overlapping)
 851       FREE(tmpImage);
 852 }
 853
 854
 855
 856
 857 void
 858 _swrast_CopyPixels( GLcontext *ctx,
 859                     GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 860                     GLint destx, GLint desty,
 861                     GLenum type )
 862 {
 863    if (SWRAST_CONTEXT(ctx)->NewState)
 864       _swrast_validate_derived( ctx );
 865
 866    if (type == GL_COLOR && ctx->Visual.rgbMode) {
 867       copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
 868    }
 869    else if (type == GL_COLOR && !ctx->Visual.rgbMode) {
 870       copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
 871    }
 872    else if (type == GL_DEPTH) {
 873       copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
 874    }
 875    else if (type == GL_STENCIL) {
 876       copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
 877    }
 878    else {
 879       _mesa_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
 880    }
 881 }