src/mesa/swrast/s_copypix.c

   1 /* $Id: s_copypix.c,v 1.17 2001/05/15 21:30:27 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    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 100    GLdepth zspan[MAX_WIDTH];
 101    GLboolean quick_draw;
 102    GLint row;
 103    GLboolean changeBuffer;
 104    GLchan *saveReadAlpha;
 105    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 106    const GLuint transferOps = ctx->_ImageTransferState;
 107    GLfloat *dest, *tmpImage, *convImage;
 108
 109    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 110       /* fill in array of z values */
 111       GLdepth z = (GLdepth)
 112          (ctx->Current.RasterPos[2] * ctx->DepthMax);
 113       GLint i;
 114       for (i = 0; i < width; i++) {
 115          zspan[i] = z;
 116       }
 117    }
 118
 119    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
 120        && !zoom
 121        && destx >= 0
 122        && destx + width <= ctx->DrawBuffer->Width) {
 123       quick_draw = GL_TRUE;
 124    }
 125    else {
 126       quick_draw = GL_FALSE;
 127    }
 128
 129    /* If read and draw buffer are different we must do buffer switching */
 130    saveReadAlpha = ctx->ReadBuffer->Alpha;
 131    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 132                || ctx->DrawBuffer != ctx->ReadBuffer;
 133
 134
 135    /* allocate space for GLfloat image */
 136    tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 137    if (!tmpImage) {
 138       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 139       return;
 140    }
 141    convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 142    if (!convImage) {
 143       FREE(tmpImage);
 144       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 145       return;
 146    }
 147
 148    dest = tmpImage;
 149
 150    if (changeBuffer) {
 151       (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 152                                     ctx->Pixel.DriverReadBuffer );
 153       if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
 154          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 155       else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
 156          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 157       else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
 158          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 159       else
 160          ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 161    }
 162
 163    /* read source image */
 164    dest = tmpImage;
 165    for (row = 0; row < height; row++) {
 166       GLchan rgba[MAX_WIDTH][4];
 167       GLint i;
 168       _mesa_read_rgba_span(ctx, ctx->ReadBuffer, width, srcx, srcy + row, rgba);
 169       /* convert GLchan to GLfloat */
 170       for (i = 0; i < width; i++) {
 171          *dest++ = (GLfloat) rgba[i][RCOMP] * (1.0F / CHAN_MAXF);
 172          *dest++ = (GLfloat) rgba[i][GCOMP] * (1.0F / CHAN_MAXF);
 173          *dest++ = (GLfloat) rgba[i][BCOMP] * (1.0F / CHAN_MAXF);
 174          *dest++ = (GLfloat) rgba[i][ACOMP] * (1.0F / CHAN_MAXF);
 175       }
 176    }
 177
 178    /* read from the draw buffer again (in case of blending) */
 179    if (changeBuffer) {
 180       (*swrast->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 181                                     ctx->Color.DriverDrawBuffer );
 182       ctx->ReadBuffer->Alpha = saveReadAlpha;
 183    }
 184
 185    /* do image transfer ops up until convolution */
 186    for (row = 0; row < height; row++) {
 187       GLfloat (*rgba)[4] = (GLfloat (*)[4]) tmpImage + row * width * 4;
 188
 189       /* scale & bias */
 190       if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 191          _mesa_scale_and_bias_rgba(ctx, width, rgba,
 192                                    ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 193                                    ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 194                                    ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 195                                    ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 196       }
 197       /* color map lookup */
 198       if (transferOps & IMAGE_MAP_COLOR_BIT) {
 199          _mesa_map_rgba(ctx, width, rgba);
 200       }
 201       /* GL_COLOR_TABLE lookup */
 202       if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 203          _mesa_lookup_rgba(&ctx->ColorTable, width, rgba);
 204       }
 205    }
 206
 207    /* do convolution */
 208    if (ctx->Pixel.Convolution2DEnabled) {
 209       _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 210    }
 211    else {
 212       ASSERT(ctx->Pixel.Separable2DEnabled);
 213       _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 214    }
 215    FREE(tmpImage);
 216
 217    /* do remaining image transfer ops */
 218    for (row = 0; row < height; row++) {
 219       GLfloat (*rgba)[4] = (GLfloat (*)[4]) convImage + row * width * 4;
 220
 221       /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 222       if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 223          _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgba);
 224       }
 225       /* color matrix */
 226       if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 227          _mesa_transform_rgba(ctx, width, rgba);
 228       }
 229       /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 230       if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 231          _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgba);
 232       }
 233       /* update histogram count */
 234       if (transferOps & IMAGE_HISTOGRAM_BIT) {
 235          _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgba);
 236       }
 237       /* update min/max */
 238       if (transferOps & IMAGE_MIN_MAX_BIT) {
 239          _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgba);
 240       }
 241    }
 242
 243    for (row = 0; row < height; row++) {
 244       const GLfloat *src = convImage + row * width * 4;
 245       GLchan rgba[MAX_WIDTH][4];
 246       GLint i, dy;
 247
 248       /* clamp to [0,1] and convert float back to chan */
 249       for (i = 0; i < width; i++) {
 250          GLint r = (GLint) (src[i * 4 + RCOMP] * CHAN_MAXF);
 251          GLint g = (GLint) (src[i * 4 + GCOMP] * CHAN_MAXF);
 252          GLint b = (GLint) (src[i * 4 + BCOMP] * CHAN_MAXF);
 253          GLint a = (GLint) (src[i * 4 + ACOMP] * CHAN_MAXF);
 254          rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 255          rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 256          rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 257          rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 258       }
 259
 260       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 261          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 262          GLchan primary_rgba[MAX_WIDTH][4];
 263          GLuint unit;
 264          /* XXX not sure how multitexture is supposed to work here */
 265
 266          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 267
 268          for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
 269             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 270                               s, t, r, q);
 271             _swrast_texture_fragments(ctx, unit, width, s, t, r, NULL,
 272                                       (CONST GLchan (*)[4]) primary_rgba,
 273                                       rgba);
 274          }
 275       }
 276
 277       /* write row to framebuffer */
 278
 279       dy = desty + row;
 280       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 281          (*swrast->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 282                                        (const GLchan (*)[4])rgba, NULL );
 283       }
 284       else if (zoom) {
 285          _mesa_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 286                                     (const GLchan (*)[4])rgba, desty);
 287       }
 288       else {
 289          _mesa_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba,
 290                                 NULL, GL_BITMAP );
 291       }
 292    }
 293
 294    FREE(convImage);
 295 }
 296
 297
 298 /*
 299  * RGBA copypixels
 300  */
 301 static void
 302 copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 303                  GLint width, GLint height, GLint destx, GLint desty)
 304 {
 305    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 306    GLdepth zspan[MAX_WIDTH];
 307    GLchan rgba[MAX_WIDTH][4];
 308    GLchan *tmpImage,*p;
 309    GLboolean quick_draw;
 310    GLint sy, dy, stepy;
 311    GLint i, j;
 312    GLboolean changeBuffer;
 313    GLchan *saveReadAlpha;
 314    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 315    GLint overlapping;
 316    const GLuint transferOps = ctx->_ImageTransferState;
 317
 318    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 319       copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
 320       return;
 321    }
 322
 323    /* Determine if copy should be done bottom-to-top or top-to-bottom */
 324    if (srcy < desty) {
 325       /* top-down  max-to-min */
 326       sy = srcy + height - 1;
 327       dy = desty + height - 1;
 328       stepy = -1;
 329    }
 330    else {
 331       /* bottom-up  min-to-max */
 332       sy = srcy;
 333       dy = desty;
 334       stepy = 1;
 335    }
 336
 337    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 338                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 339
 340    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 341       /* fill in array of z values */
 342       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->DepthMax);
 343       for (i=0;i<width;i++) {
 344          zspan[i] = z;
 345       }
 346    }
 347
 348    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
 349        && !zoom
 350        && destx >= 0
 351        && destx + width <= ctx->DrawBuffer->Width) {
 352       quick_draw = GL_TRUE;
 353    }
 354    else {
 355       quick_draw = GL_FALSE;
 356    }
 357
 358    /* If read and draw buffer are different we must do buffer switching */
 359    saveReadAlpha = ctx->ReadBuffer->Alpha;
 360    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 361                   || ctx->DrawBuffer != ctx->ReadBuffer;
 362
 363    (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 364                                  ctx->Pixel.DriverReadBuffer );
 365
 366    if (overlapping) {
 367       GLint ssy = sy;
 368       tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
 369       if (!tmpImage) {
 370          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 371          return;
 372       }
 373       p = tmpImage;
 374       if (changeBuffer) {
 375          (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 376                                        ctx->Pixel.DriverReadBuffer );
 377          if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
 378             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 379          else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
 380             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 381          else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
 382             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 383          else
 384             ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 385       }
 386       for (j = 0; j < height; j++, ssy += stepy) {
 387          _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, ssy,
 388                             (GLchan (*)[4]) p );
 389          p += (width * sizeof(GLchan) * 4);
 390       }
 391       p = tmpImage;
 392    }
 393    else {
 394       tmpImage = NULL;  /* silence compiler warnings */
 395       p = NULL;
 396    }
 397
 398    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 399       /* Get source pixels */
 400       if (overlapping) {
 401          /* get from buffered image */
 402          MEMCPY(rgba, p, width * sizeof(GLchan) * 4);
 403          p += (width * sizeof(GLchan) * 4);
 404       }
 405       else {
 406          /* get from framebuffer */
 407          if (changeBuffer) {
 408             (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 409                                           ctx->Pixel.DriverReadBuffer );
 410             if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT) {
 411                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
 412             }
 413             else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT) {
 414                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
 415             }
 416             else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT) {
 417                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
 418             }
 419             else {
 420                ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
 421             }
 422          }
 423          _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, sy, rgba );
 424       }
 425
 426       if (changeBuffer) {
 427          /* read from the draw buffer again (in case of blending) */
 428          (*swrast->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 429                                        ctx->Color.DriverDrawBuffer );
 430          ctx->ReadBuffer->Alpha = saveReadAlpha;
 431       }
 432
 433       if (transferOps) {
 434          const GLfloat scale = (1.0F / CHAN_MAXF);
 435          GLfloat rgbaFloat[MAX_WIDTH][4];
 436          GLint k;
 437          /* convert chan to float */
 438          for (k = 0; k < width; k++) {
 439             rgbaFloat[k][RCOMP] = (GLfloat) rgba[k][RCOMP] * scale;
 440             rgbaFloat[k][GCOMP] = (GLfloat) rgba[k][GCOMP] * scale;
 441             rgbaFloat[k][BCOMP] = (GLfloat) rgba[k][BCOMP] * scale;
 442             rgbaFloat[k][ACOMP] = (GLfloat) rgba[k][ACOMP] * scale;
 443          }
 444          /* scale & bias */
 445          if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 446             _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat,
 447                                    ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 448                                    ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 449                                    ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 450                                    ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 451          }
 452          /* color map lookup */
 453          if (transferOps & IMAGE_MAP_COLOR_BIT) {
 454             _mesa_map_rgba(ctx, width, rgbaFloat);
 455          }
 456          /* GL_COLOR_TABLE lookup */
 457          if (transferOps & IMAGE_COLOR_TABLE_BIT) {
 458             _mesa_lookup_rgba(&ctx->ColorTable, width, rgbaFloat);
 459          }
 460          /* convolution */
 461          if (transferOps & IMAGE_CONVOLUTION_BIT) {
 462             /* XXX to do */
 463          }
 464          /* GL_POST_CONVOLUTION_RED/GREEN/BLUE/ALPHA_SCALE/BIAS */
 465          if (transferOps & IMAGE_POST_CONVOLUTION_SCALE_BIAS) {
 466             _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat,
 467                                       ctx->Pixel.PostConvolutionScale[RCOMP],
 468                                       ctx->Pixel.PostConvolutionScale[GCOMP],
 469                                       ctx->Pixel.PostConvolutionScale[BCOMP],
 470                                       ctx->Pixel.PostConvolutionScale[ACOMP],
 471                                       ctx->Pixel.PostConvolutionBias[RCOMP],
 472                                       ctx->Pixel.PostConvolutionBias[GCOMP],
 473                                       ctx->Pixel.PostConvolutionBias[BCOMP],
 474                                       ctx->Pixel.PostConvolutionBias[ACOMP]);
 475          }
 476          /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
 477          if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
 478             _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgbaFloat);
 479          }
 480          /* color matrix */
 481          if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
 482             _mesa_transform_rgba(ctx, width, rgbaFloat);
 483          }
 484          /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
 485          if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
 486             _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgbaFloat);
 487          }
 488          /* update histogram count */
 489          if (transferOps & IMAGE_HISTOGRAM_BIT) {
 490             _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 491          }
 492          /* update min/max */
 493          if (transferOps & IMAGE_MIN_MAX_BIT) {
 494             _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
 495          }
 496          /* clamp to [0,1] and convert float back to chan */
 497          for (k = 0; k < width; k++) {
 498             GLint r = (GLint) (rgbaFloat[k][RCOMP] * CHAN_MAXF);
 499             GLint g = (GLint) (rgbaFloat[k][GCOMP] * CHAN_MAXF);
 500             GLint b = (GLint) (rgbaFloat[k][BCOMP] * CHAN_MAXF);
 501             GLint a = (GLint) (rgbaFloat[k][ACOMP] * CHAN_MAXF);
 502             rgba[k][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
 503             rgba[k][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
 504             rgba[k][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
 505             rgba[k][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
 506          }
 507       }
 508
 509       if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 510          GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 511          GLchan primary_rgba[MAX_WIDTH][4];
 512          GLuint unit;
 513          /* XXX not sure how multitexture is supposed to work here */
 514
 515          MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 516
 517          for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
 518             _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 519                               s, t, r, q);
 520             _swrast_texture_fragments(ctx, unit, width, s, t, r, NULL,
 521                                       (CONST GLchan (*)[4]) primary_rgba,
 522                                       rgba);
 523          }
 524       }
 525
 526       if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
 527          (*swrast->Driver.WriteRGBASpan)( ctx, width, destx, dy,
 528                                        (const GLchan (*)[4])rgba, NULL );
 529       }
 530       else if (zoom) {
 531          _mesa_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 532                                     (const GLchan (*)[4])rgba, desty);
 533       }
 534       else {
 535          _mesa_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba,
 536                                 NULL, GL_BITMAP );
 537       }
 538    }
 539
 540    /* Restore pixel source to be the draw buffer (for blending, etc) */
 541    (*swrast->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 542                                  ctx->Color.DriverDrawBuffer );
 543
 544    if (overlapping)
 545       FREE(tmpImage);
 546 }
 547
 548
 549 static void copy_ci_pixels( GLcontext *ctx,
 550                             GLint srcx, GLint srcy, GLint width, GLint height,
 551                             GLint destx, GLint desty )
 552 {
 553    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 554    GLdepth zspan[MAX_WIDTH];
 555    GLuint *tmpImage,*p;
 556    GLint sy, dy, stepy;
 557    GLint i, j;
 558    GLboolean changeBuffer;
 559    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 560    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 561    GLint overlapping;
 562
 563    /* Determine if copy should be bottom-to-top or top-to-bottom */
 564    if (srcy<desty) {
 565       /* top-down  max-to-min */
 566       sy = srcy + height - 1;
 567       dy = desty + height - 1;
 568       stepy = -1;
 569    }
 570    else {
 571       /* bottom-up  min-to-max */
 572       sy = srcy;
 573       dy = desty;
 574       stepy = 1;
 575    }
 576
 577    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 578                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 579
 580    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 581       /* fill in array of z values */
 582       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->DepthMax);
 583       for (i=0;i<width;i++) {
 584          zspan[i] = z;
 585       }
 586    }
 587
 588    /* If read and draw buffer are different we must do buffer switching */
 589    changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
 590                || ctx->DrawBuffer != ctx->ReadBuffer;
 591
 592    (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 593                                  ctx->Pixel.DriverReadBuffer );
 594
 595    if (overlapping) {
 596       GLint ssy = sy;
 597       tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
 598       if (!tmpImage) {
 599          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 600          return;
 601       }
 602       p = tmpImage;
 603       if (changeBuffer) {
 604          (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 605                                        ctx->Pixel.DriverReadBuffer );
 606       }
 607       for (j = 0; j < height; j++, ssy += stepy) {
 608          _mesa_read_index_span( ctx, ctx->ReadBuffer, width, srcx, ssy, p );
 609          p += width;
 610       }
 611       p = tmpImage;
 612    }
 613    else {
 614       tmpImage = NULL;  /* silence compiler warning */
 615       p = NULL;
 616    }
 617
 618    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 619       GLuint indexes[MAX_WIDTH];
 620       if (overlapping) {
 621          MEMCPY(indexes, p, width * sizeof(GLuint));
 622          p += width;
 623       }
 624       else {
 625          if (changeBuffer) {
 626             (*swrast->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
 627                                           ctx->Pixel.DriverReadBuffer );
 628          }
 629          _mesa_read_index_span( ctx, ctx->ReadBuffer, width, srcx, sy, indexes );
 630       }
 631
 632       if (changeBuffer) {
 633          /* set read buffer back to draw buffer (in case of logicops) */
 634          (*swrast->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 635                                        ctx->Color.DriverDrawBuffer );
 636       }
 637
 638       if (shift_or_offset) {
 639          _mesa_shift_and_offset_ci( ctx, width, indexes );
 640       }
 641       if (ctx->Pixel.MapColorFlag) {
 642          _mesa_map_ci( ctx, width, indexes );
 643       }
 644
 645       if (zoom) {
 646          _mesa_write_zoomed_index_span(ctx, width, destx, dy, zspan, 0,
 647                                        indexes, desty );
 648       }
 649       else {
 650          _mesa_write_index_span(ctx, width, destx, dy, zspan, 0, indexes,
 651                                 NULL, GL_BITMAP);
 652       }
 653    }
 654
 655    /* Restore pixel source to be the draw buffer (for blending, etc) */
 656    (*swrast->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
 657                                  ctx->Color.DriverDrawBuffer );
 658
 659    if (overlapping)
 660       FREE(tmpImage);
 661 }
 662
 663
 664
 665 /*
 666  * TODO: Optimize!!!!
 667  */
 668 static void copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 669                                GLint width, GLint height,
 670                                GLint destx, GLint desty )
 671 {
 672    GLfloat depth[MAX_WIDTH];
 673    GLdepth zspan[MAX_WIDTH];
 674    GLfloat *p, *tmpImage;
 675    GLuint indexes[MAX_WIDTH];
 676    GLchan rgba[MAX_WIDTH][4];
 677    GLint sy, dy, stepy;
 678    GLint i, j;
 679    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 680    GLint overlapping;
 681
 682    if (!ctx->Visual.depthBits) {
 683       _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 684       return;
 685    }
 686
 687    /* Determine if copy should be bottom-to-top or top-to-bottom */
 688    if (srcy<desty) {
 689       /* top-down  max-to-min */
 690       sy = srcy + height - 1;
 691       dy = desty + height - 1;
 692       stepy = -1;
 693    }
 694    else {
 695       /* bottom-up  min-to-max */
 696       sy = srcy;
 697       dy = desty;
 698       stepy = 1;
 699    }
 700
 701    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 702                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 703
 704    /* setup colors or indexes */
 705    if (ctx->Visual.rgbMode) {
 706       GLuint *rgba32 = (GLuint *) rgba;
 707       GLuint color = *(GLuint*)( ctx->Current.Color );
 708       for (i = 0; i < width; i++) {
 709          rgba32[i] = color;
 710       }
 711    }
 712    else {
 713       for (i = 0; i < width; i++) {
 714          indexes[i] = ctx->Current.Index;
 715       }
 716    }
 717
 718    if (overlapping) {
 719       GLint ssy = sy;
 720       tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
 721       if (!tmpImage) {
 722          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 723          return;
 724       }
 725       p = tmpImage;
 726       for (j = 0; j < height; j++, ssy += stepy) {
 727          _mesa_read_depth_span_float(ctx, width, srcx, ssy, p);
 728          p += width;
 729       }
 730       p = tmpImage;
 731    }
 732    else {
 733       tmpImage = NULL;  /* silence compiler warning */
 734       p = NULL;
 735    }
 736
 737    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 738       if (overlapping) {
 739          MEMCPY(depth, p, width * sizeof(GLfloat));
 740          p += width;
 741       }
 742       else {
 743          _mesa_read_depth_span_float(ctx, width, srcx, sy, depth);
 744       }
 745
 746       for (i = 0; i < width; i++) {
 747          GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
 748          zspan[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * ctx->DepthMax);
 749       }
 750
 751       if (ctx->Visual.rgbMode) {
 752          if (zoom) {
 753             _mesa_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
 754                                        (const GLchan (*)[4])rgba, desty );
 755          }
 756          else {
 757             _mesa_write_rgba_span( ctx, width, destx, dy, zspan, 0,
 758                                    rgba, NULL, GL_BITMAP);
 759          }
 760       }
 761       else {
 762          if (zoom) {
 763             _mesa_write_zoomed_index_span( ctx, width, destx, dy,
 764                                            zspan, 0, indexes, desty );
 765          }
 766          else {
 767             _mesa_write_index_span( ctx, width, destx, dy,
 768                                     zspan, 0, indexes, NULL, GL_BITMAP );
 769          }
 770       }
 771    }
 772
 773   if (overlapping)
 774      FREE(tmpImage);
 775 }
 776
 777
 778
 779 static void copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 780                                  GLint width, GLint height,
 781                                  GLint destx, GLint desty )
 782 {
 783    GLint sy, dy, stepy;
 784    GLint j;
 785    GLstencil *p, *tmpImage;
 786    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 787    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 788    GLint overlapping;
 789
 790    if (!ctx->Visual.stencilBits) {
 791       _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
 792       return;
 793    }
 794
 795    /* Determine if copy should be bottom-to-top or top-to-bottom */
 796    if (srcy < desty) {
 797       /* top-down  max-to-min */
 798       sy = srcy + height - 1;
 799       dy = desty + height - 1;
 800       stepy = -1;
 801    }
 802    else {
 803       /* bottom-up  min-to-max */
 804       sy = srcy;
 805       dy = desty;
 806       stepy = 1;
 807    }
 808
 809    overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 810                                  ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 811
 812    if (overlapping) {
 813       GLint ssy = sy;
 814       tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
 815       if (!tmpImage) {
 816          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 817          return;
 818       }
 819       p = tmpImage;
 820       for (j = 0; j < height; j++, ssy += stepy) {
 821          _mesa_read_stencil_span( ctx, width, srcx, ssy, p );
 822          p += width;
 823       }
 824       p = tmpImage;
 825    }
 826    else {
 827       tmpImage = NULL;  /* silence compiler warning */
 828       p = NULL;
 829    }
 830
 831    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 832       GLstencil stencil[MAX_WIDTH];
 833
 834       if (overlapping) {
 835          MEMCPY(stencil, p, width * sizeof(GLstencil));
 836          p += width;
 837       }
 838       else {
 839          _mesa_read_stencil_span( ctx, width, srcx, sy, stencil );
 840       }
 841
 842       if (shift_or_offset) {
 843          _mesa_shift_and_offset_stencil( ctx, width, stencil );
 844       }
 845       if (ctx->Pixel.MapStencilFlag) {
 846          _mesa_map_stencil( ctx, width, stencil );
 847       }
 848
 849       if (zoom) {
 850          _mesa_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
 851       }
 852       else {
 853          _mesa_write_stencil_span( ctx, width, destx, dy, stencil );
 854       }
 855    }
 856
 857    if (overlapping)
 858       FREE(tmpImage);
 859 }
 860
 861
 862
 863
 864 void
 865 _swrast_CopyPixels( GLcontext *ctx,
 866                     GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 867                     GLint destx, GLint desty,
 868                     GLenum type )
 869 {
 870    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 871    RENDER_START(swrast,ctx);
 872
 873    if (swrast->NewState)
 874       _swrast_validate_derived( ctx );
 875
 876    if (type == GL_COLOR && ctx->Visual.rgbMode) {
 877       copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
 878    }
 879    else if (type == GL_COLOR && !ctx->Visual.rgbMode) {
 880       copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
 881    }
 882    else if (type == GL_DEPTH) {
 883       copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
 884    }
 885    else if (type == GL_STENCIL) {
 886       copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
 887    }
 888    else {
 889       _mesa_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
 890    }
 891
 892    RENDER_FINISH(swrast,ctx);
 893 }