src/mesa/swrast/s_copypix.c

   1 /* $Id: s_copypix.c,v 1.3 2000/11/05 18:24:40 keithw 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_imaging.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       }
 172       /* color map lookup */
 173       if (transferOps & IMAGE_MAP_COLOR_BIT) {
 174          _mesa_map_rgba(ctx, width, rgba);
 175       }
 176       /* GL_COLOR_TABLE lookup */
 177       if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 178          _mesa_lookup_rgba(&ctx->ColorTable, width, rgba);
 179       }
 180    }
 181
 182    /* do convolution */
 183    if (ctx->Pixel.Convolution2DEnabled) {
 184       _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 185    }
 186    else {
 187       ASSERT(ctx->Pixel.Separable2DEnabled);
 188       _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 189    }
 190    FREE(tmpImage);
 191
 192    /* do remaining image transfer ops */
 193    for (row = 0; row < height; row++) {
 194       GLfloat (*rgba)[4] = (GLfloat (*)[4]) convImage + row * width * 4;
 195
 196       /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 197       if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 198          _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgba);
 199       }
 200       /* color matrix */
 201       if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 202          _mesa_transform_rgba(ctx, width, rgba);
 203       }
 204       /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 205       if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 206          _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgba);
 207       }
 208       /* update histogram count */
 209       if (transferOps & IMAGE_HISTOGRAM_BIT) {
 210          _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgba);
 211       }
 212       /* update min/max */
 213       if (transferOps & IMAGE_MIN_MAX_BIT) {
 214          _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgba);
 215       }
 216    }
 217
 218    for (row = 0; row < height; row++) {
 219       const GLfloat *src = convImage + row * width * 4;
 220       GLchan rgba[MAX_WIDTH][4];
 221       GLint i, dy;
 222
 223       /* clamp to [0,1] and convert float back to chan */
 224       for (i = 0; i < width; i++) {
 225          GLint r = (GLint) (src[i * 4 + RCOMP] * CHAN_MAXF);
 226          GLint g = (GLint) (src[i * 4 + GCOMP] * CHAN_MAXF);
 227          GLint b = (GLint) (src[i * 4 + BCOMP] * CHAN_MAXF);
 228          GLint a = (GLint) (src[i * 4 + ACOMP] * CHAN_MAXF);
 229          rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 230          rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 231          rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 232          rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 233       }
 234
 235       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 236          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 237          GLchan primary_rgba[MAX_WIDTH][4];
 238          GLuint unit;
 239          /* XXX not sure how multitexture is supposed to work here */
 240
 241          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 242
 243          for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
 244             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 245                               s, t, r, q);
 246             gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
 247                               primary_rgba, rgba);
 248          }
 249       }
 250
 251       /* write row to framebuffer */
 252
 253       dy = desty + row;
 254       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 255          (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 256                                        (const GLchan (*)[4])rgba, NULL );
 257       }
 258       else if (zoom) {
 259          gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 260                                     (const GLchan (*)[4])rgba, desty);
 261       }
 262       else {
 263          gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
 264       }
 265    }
 266
 267    FREE(convImage);
 268 }
 269
 270
 271 /*
 272  * RGBA copypixels
 273  */
 274 static void
 275 copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 276                  GLint width, GLint height, GLint destx, GLint desty)
 277 {
 278    GLdepth zspan[MAX_WIDTH];
 279    GLchan rgba[MAX_WIDTH][4];
 280    GLchan *tmpImage,*p;
 281    GLboolean quick_draw;
 282    GLint sy, dy, stepy;
 283    GLint i, j;
 284    GLboolean changeBuffer;
 285    GLchan *saveReadAlpha;
 286    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 287    GLint overlapping;
 288    const GLuint transferOps = ctx->_ImageTransferState;
 289
 290    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 291       copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
 292       return;
 293    }
 294
 295    /* Determine if copy should be done bottom-to-top or top-to-bottom */
 296    if (srcy < desty) {
 297       /* top-down  max-to-min */
 298       sy = srcy + height - 1;
 299       dy = desty + height - 1;
 300       stepy = -1;
 301    }
 302    else {
 303       /* bottom-up  min-to-max */
 304       sy = srcy;
 305       dy = desty;
 306       stepy = 1;
 307    }
 308
 309    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 310                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 311
 312    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 313       /* fill in array of z values */
 314       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
 315       for (i=0;i<width;i++) {
 316          zspan[i] = z;
 317       }
 318    }
 319
 320    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
 321        && !zoom
 322        && destx >= 0
 323        && destx + width <= ctx->DrawBuffer->Width) {
 324       quick_draw = GL_TRUE;
 325    }
 326    else {
 327       quick_draw = GL_FALSE;
 328    }
 329
 330    /* If read and draw buffer are different we must do buffer switching */
 331    saveReadAlpha = ctx->ReadBuffer->Alpha;
 332    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 333                   || ctx->DrawBuffer != ctx->ReadBuffer;
 334
 335    (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 336                                  ctx->Pixel.DriverReadBuffer );
 337
 338    if (overlapping) {
 339       GLint ssy = sy;
 340       tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
 341       if (!tmpImage) {
 342          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 343          return;
 344       }
 345       p = tmpImage;
 346       if (changeBuffer) {
 347          (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 348                                        ctx->Pixel.DriverReadBuffer );
 349          if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
 350             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 351          else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
 352             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 353          else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
 354             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 355          else
 356             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 357       }
 358       for (j = 0; j < height; j++, ssy += stepy) {
 359          gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, ssy,
 360                             (GLchan (*)[4]) p );
 361          p += (width * sizeof(GLchan) * 4);
 362       }
 363       p = tmpImage;
 364    }
 365    else {
 366       tmpImage = NULL;  /* silence compiler warnings */
 367       p = NULL;
 368    }
 369
 370    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 371       /* Get source pixels */
 372       if (overlapping) {
 373          /* get from buffered image */
 374          MEMCPY(rgba, p, width * sizeof(GLchan) * 4);
 375          p += (width * sizeof(GLchan) * 4);
 376       }
 377       else {
 378          /* get from framebuffer */
 379          if (changeBuffer) {
 380             (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 381                                           ctx->Pixel.DriverReadBuffer );
 382             if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT) {
 383                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 384             }
 385             else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT) {
 386                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 387             }
 388             else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT) {
 389                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 390             }
 391             else {
 392                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 393             }
 394          }
 395          gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, sy, rgba );
 396       }
 397
 398       if (changeBuffer) {
 399          /* read from the draw buffer again (in case of blending) */
 400          (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 401                                        ctx->Color.DriverDrawBuffer );
 402          ctx->ReadBuffer->Alpha = saveReadAlpha;
 403       }
 404
 405       if (transferOps) {
 406          const GLfloat scale = (1.0F / CHAN_MAXF);
 407          GLfloat rgbaFloat[MAX_WIDTH][4];
 408          GLuint k;
 409          /* convert chan to float */
 410          for (k = 0; k < width; k++) {
 411             rgbaFloat[k][RCOMP] = (GLfloat) rgba[k][RCOMP] * scale;
 412             rgbaFloat[k][GCOMP] = (GLfloat) rgba[k][GCOMP] * scale;
 413             rgbaFloat[k][BCOMP] = (GLfloat) rgba[k][BCOMP] * scale;
 414             rgbaFloat[k][ACOMP] = (GLfloat) rgba[k][ACOMP] * scale;
 415          }
 416          /* scale & bias */
 417          if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 418             _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat);
 419          }
 420          /* color map lookup */
 421          if (transferOps & IMAGE_MAP_COLOR_BIT) {
 422             _mesa_map_rgba(ctx, width, rgbaFloat);
 423          }
 424          /* GL_COLOR_TABLE lookup */
 425          if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 426             _mesa_lookup_rgba(&ctx->ColorTable, width, rgbaFloat);
 427          }
 428          /* convolution */
 429          if (transferOps & IMAGE_CONVOLUTION_BIT) {
 430             /* XXX to do */
 431          }
 432          /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 433          if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 434             _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgbaFloat);
 435          }
 436          /* color matrix */
 437          if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 438             _mesa_transform_rgba(ctx, width, rgbaFloat);
 439          }
 440          /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 441          if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 442             _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgbaFloat);
 443          }
 444          /* update histogram count */
 445          if (transferOps & IMAGE_HISTOGRAM_BIT) {
 446             _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 447          }
 448          /* update min/max */
 449          if (transferOps & IMAGE_MIN_MAX_BIT) {
 450             _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 451          }
 452          /* clamp to [0,1] and convert float back to chan */
 453          for (k = 0; k < width; k++) {
 454             GLint r = (GLint) (rgbaFloat[k][RCOMP] * CHAN_MAXF);
 455             GLint g = (GLint) (rgbaFloat[k][GCOMP] * CHAN_MAXF);
 456             GLint b = (GLint) (rgbaFloat[k][BCOMP] * CHAN_MAXF);
 457             GLint a = (GLint) (rgbaFloat[k][ACOMP] * CHAN_MAXF);
 458             rgba[k][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 459             rgba[k][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 460             rgba[k][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 461             rgba[k][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 462          }
 463       }
 464
 465       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 466          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 467          GLchan primary_rgba[MAX_WIDTH][4];
 468          GLuint unit;
 469          /* XXX not sure how multitexture is supposed to work here */
 470
 471          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 472
 473          for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
 474             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 475                               s, t, r, q);
 476             gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
 477                               primary_rgba, rgba);
 478          }
 479       }
 480
 481       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 482          (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 483                                        (const GLchan (*)[4])rgba, NULL );
 484       }
 485       else if (zoom) {
 486          gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 487                                     (const GLchan (*)[4])rgba, desty);
 488       }
 489       else {
 490          gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
 491       }
 492    }
 493
 494    /* Restore pixel source to be the draw buffer (for blending, etc) */
 495    (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 496                                  ctx->Color.DriverDrawBuffer );
 497
 498    if (overlapping)
 499       FREE(tmpImage);
 500 }
 501
 502
 503 static void copy_ci_pixels( GLcontext *ctx,
 504                             GLint srcx, GLint srcy, GLint width, GLint height,
 505                             GLint destx, GLint desty )
 506 {
 507    GLdepth zspan[MAX_WIDTH];
 508    GLuint *tmpImage,*p;
 509    GLint sy, dy, stepy;
 510    GLint i, j;
 511    GLboolean changeBuffer;
 512    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 513    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 514    GLint overlapping;
 515
 516    /* Determine if copy should be bottom-to-top or top-to-bottom */
 517    if (srcy<desty) {
 518       /* top-down  max-to-min */
 519       sy = srcy + height - 1;
 520       dy = desty + height - 1;
 521       stepy = -1;
 522    }
 523    else {
 524       /* bottom-up  min-to-max */
 525       sy = srcy;
 526       dy = desty;
 527       stepy = 1;
 528    }
 529
 530    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 531                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 532
 533    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 534       /* fill in array of z values */
 535       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
 536       for (i=0;i<width;i++) {
 537          zspan[i] = z;
 538       }
 539    }
 540
 541    /* If read and draw buffer are different we must do buffer switching */
 542    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 543                || ctx->DrawBuffer != ctx->ReadBuffer;
 544
 545    (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 546                                  ctx->Pixel.DriverReadBuffer );
 547
 548    if (overlapping) {
 549       GLint ssy = sy;
 550       tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
 551       if (!tmpImage) {
 552          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 553          return;
 554       }
 555       p = tmpImage;
 556       if (changeBuffer) {
 557          (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 558                                        ctx->Pixel.DriverReadBuffer );
 559       }
 560       for (j = 0; j < height; j++, ssy += stepy) {
 561          gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, ssy, p );
 562          p += width;
 563       }
 564       p = tmpImage;
 565    }
 566    else {
 567       tmpImage = NULL;  /* silence compiler warning */
 568       p = NULL;
 569    }
 570
 571    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 572       GLuint indexes[MAX_WIDTH];
 573       if (overlapping) {
 574          MEMCPY(indexes, p, width * sizeof(GLuint));
 575          p += width;
 576       }
 577       else {
 578          if (changeBuffer) {
 579             (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 580                                           ctx->Pixel.DriverReadBuffer );
 581          }
 582          gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, sy, indexes );
 583       }
 584
 585       if (changeBuffer) {
 586          /* set read buffer back to draw buffer (in case of logicops) */
 587          (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 588                                        ctx->Color.DriverDrawBuffer );
 589       }
 590
 591       if (shift_or_offset) {
 592          _mesa_shift_and_offset_ci( ctx, width, indexes );
 593       }
 594       if (ctx->Pixel.MapColorFlag) {
 595          _mesa_map_ci( ctx, width, indexes );
 596       }
 597
 598       if (zoom) {
 599          gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, 0, indexes, desty );
 600       }
 601       else {
 602          gl_write_index_span(ctx, width, destx, dy, zspan, 0, indexes, GL_BITMAP);
 603       }
 604    }
 605
 606    /* Restore pixel source to be the draw buffer (for blending, etc) */
 607    (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 608                                  ctx->Color.DriverDrawBuffer );
 609
 610    if (overlapping)
 611       FREE(tmpImage);
 612 }
 613
 614
 615
 616 /*
 617  * TODO: Optimize!!!!
 618  */
 619 static void copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 620                                GLint width, GLint height,
 621                                GLint destx, GLint desty )
 622 {
 623    GLfloat depth[MAX_WIDTH];
 624    GLdepth zspan[MAX_WIDTH];
 625    GLfloat *p, *tmpImage;
 626    GLuint indexes[MAX_WIDTH];
 627    GLchan rgba[MAX_WIDTH][4];
 628    GLint sy, dy, stepy;
 629    GLint i, j;
 630    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 631    GLint overlapping;
 632
 633    if (!ctx->ReadBuffer->DepthBuffer || !ctx->DrawBuffer->DepthBuffer) {
 634       gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 635       return;
 636    }
 637
 638    /* Determine if copy should be bottom-to-top or top-to-bottom */
 639    if (srcy<desty) {
 640       /* top-down  max-to-min */
 641       sy = srcy + height - 1;
 642       dy = desty + height - 1;
 643       stepy = -1;
 644    }
 645    else {
 646       /* bottom-up  min-to-max */
 647       sy = srcy;
 648       dy = desty;
 649       stepy = 1;
 650    }
 651
 652    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 653                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 654
 655    /* setup colors or indexes */
 656    if (ctx->Visual.RGBAflag) {
 657       GLuint *rgba32 = (GLuint *) rgba;
 658       GLuint color = *(GLuint*)( ctx->Current.Color );
 659       for (i = 0; i < width; i++) {
 660          rgba32[i] = color;
 661       }
 662    }
 663    else {
 664       for (i = 0; i < width; i++) {
 665          indexes[i] = ctx->Current.Index;
 666       }
 667    }
 668
 669    if (overlapping) {
 670       GLint ssy = sy;
 671       tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
 672       if (!tmpImage) {
 673          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 674          return;
 675       }
 676       p = tmpImage;
 677       for (j = 0; j < height; j++, ssy += stepy) {
 678          _mesa_read_depth_span_float(ctx, width, srcx, ssy, p);
 679          p += width;
 680       }
 681       p = tmpImage;
 682    }
 683    else {
 684       tmpImage = NULL;  /* silence compiler warning */
 685       p = NULL;
 686    }
 687
 688    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 689       if (overlapping) {
 690          MEMCPY(depth, p, width * sizeof(GLfloat));
 691          p += width;
 692       }
 693       else {
 694          _mesa_read_depth_span_float(ctx, width, srcx, sy, depth);
 695       }
 696
 697       for (i = 0; i < width; i++) {
 698          GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
 699          zspan[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * ctx->Visual.DepthMax);
 700       }
 701
 702       if (ctx->Visual.RGBAflag) {
 703          if (zoom) {
 704             gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 705                                        (const GLchan (*)[4])rgba, desty );
 706          }
 707          else {
 708             gl_write_rgba_span( ctx, width, destx, dy, zspan, 0,
 709                                 rgba, GL_BITMAP);
 710          }
 711       }
 712       else {
 713          if (zoom) {
 714             gl_write_zoomed_index_span( ctx, width, destx, dy,
 715                                         zspan, 0, indexes, desty );
 716          }
 717          else {
 718             gl_write_index_span( ctx, width, destx, dy,
 719                                  zspan, 0, indexes, GL_BITMAP );
 720          }
 721       }
 722    }
 723
 724   if (overlapping)
 725      FREE(tmpImage);
 726 }
 727
 728
 729
 730 static void copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 731                                  GLint width, GLint height,
 732                                  GLint destx, GLint desty )
 733 {
 734    GLint sy, dy, stepy;
 735    GLint j;
 736    GLstencil *p, *tmpImage;
 737    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 738    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 739    GLint overlapping;
 740
 741    if (!ctx->DrawBuffer->Stencil || !ctx->ReadBuffer->Stencil) {
 742       gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 743       return;
 744    }
 745
 746    /* Determine if copy should be bottom-to-top or top-to-bottom */
 747    if (srcy < desty) {
 748       /* top-down  max-to-min */
 749       sy = srcy + height - 1;
 750       dy = desty + height - 1;
 751       stepy = -1;
 752    }
 753    else {
 754       /* bottom-up  min-to-max */
 755       sy = srcy;
 756       dy = desty;
 757       stepy = 1;
 758    }
 759
 760    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 761                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 762
 763    if (overlapping) {
 764       GLint ssy = sy;
 765       tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
 766       if (!tmpImage) {
 767          gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 768          return;
 769       }
 770       p = tmpImage;
 771       for (j = 0; j < height; j++, ssy += stepy) {
 772          _mesa_read_stencil_span( ctx, width, srcx, ssy, p );
 773          p += width;
 774       }
 775       p = tmpImage;
 776    }
 777    else {
 778       tmpImage = NULL;  /* silence compiler warning */
 779       p = NULL;
 780    }
 781
 782    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 783       GLstencil stencil[MAX_WIDTH];
 784
 785       if (overlapping) {
 786          MEMCPY(stencil, p, width * sizeof(GLstencil));
 787          p += width;
 788       }
 789       else {
 790          _mesa_read_stencil_span( ctx, width, srcx, sy, stencil );
 791       }
 792
 793       if (shift_or_offset) {
 794          _mesa_shift_and_offset_stencil( ctx, width, stencil );
 795       }
 796       if (ctx->Pixel.MapStencilFlag) {
 797          _mesa_map_stencil( ctx, width, stencil );
 798       }
 799
 800       if (zoom) {
 801          gl_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
 802       }
 803       else {
 804          _mesa_write_stencil_span( ctx, width, destx, dy, stencil );
 805       }
 806    }
 807
 808    if (overlapping)
 809       FREE(tmpImage);
 810 }
 811
 812
 813
 814
 815 void
 816 _swrast_CopyPixels( GLcontext *ctx,
 817                     GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 818                     GLint destx, GLint desty,
 819                     GLenum type )
 820 {
 821    if (SWRAST_CONTEXT(ctx)->NewState)
 822       _swrast_validate_derived( ctx );
 823
 824    if (type == GL_COLOR && ctx->Visual.RGBAflag) {
 825       copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
 826    }
 827    else if (type == GL_COLOR && !ctx->Visual.RGBAflag) {
 828       copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
 829    }
 830    else if (type == GL_DEPTH) {
 831       copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
 832    }
 833    else if (type == GL_STENCIL) {
 834       copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
 835    }
 836    else {
 837       gl_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
 838    }
 839 }