src/mesa/swrast/s_drawpix.c

   1 /* $Id: s_drawpix.c,v 1.41 2002/12/05 04:48:53 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.1
   6  *
   7  * Copyright (C) 1999-2002  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 "context.h"
  30 #include "convolve.h"
  31 #include "image.h"
  32 #include "macros.h"
  33 #include "imports.h"
  34 #include "mmath.h"
  35 #include "pixel.h"
  36
  37 #include "s_context.h"
  38 #include "s_drawpix.h"
  39 #include "s_pixeltex.h"
  40 #include "s_span.h"
  41 #include "s_stencil.h"
  42 #include "s_zoom.h"
  43
  44
  45
  46 /*
  47  * Given the dest position, size and skipPixels and skipRows values
  48  * for a glDrawPixels command, perform clipping of the image bounds
  49  * so the result lies withing the context's buffer bounds.
  50  * Return:  GL_TRUE if image is ready for drawing
  51  *          GL_FALSE if image was completely clipped away (draw nothing)
  52  */
  53 GLboolean
  54 _mesa_clip_pixelrect(const GLcontext *ctx,
  55                      GLint *destX, GLint *destY,
  56                      GLsizei *width, GLsizei *height,
  57                      GLint *skipPixels, GLint *skipRows)
  58 {
  59    const GLframebuffer *buffer = ctx->DrawBuffer;
  60
  61    /* left clipping */
  62    if (*destX < buffer->_Xmin) {
  63       *skipPixels += (buffer->_Xmin - *destX);
  64       *width -= (buffer->_Xmin - *destX);
  65       *destX = buffer->_Xmin;
  66    }
  67    /* right clipping */
  68    if (*destX + *width > buffer->_Xmax)
  69       *width -= (*destX + *width - buffer->_Xmax);
  70
  71    if (*width <= 0)
  72       return GL_FALSE;
  73
  74    /* bottom clipping */
  75    if (*destY < buffer->_Ymin) {
  76       *skipRows += (buffer->_Ymin - *destY);
  77       *height -= (buffer->_Ymin - *destY);
  78       *destY = buffer->_Ymin;
  79    }
  80    /* top clipping */
  81    if (*destY + *height > buffer->_Ymax)
  82       *height -= (*destY + *height - buffer->_Ymax);
  83
  84    if (*height <= 0)
  85       return GL_TRUE;
  86
  87    return GL_TRUE;
  88 }
  89
  90
  91
  92 /*
  93  * Try to do a fast and simple RGB(a) glDrawPixels.
  94  * Return:  GL_TRUE if success, GL_FALSE if slow path must be used instead
  95  */
  96 static GLboolean
  97 fast_draw_pixels(GLcontext *ctx, GLint x, GLint y,
  98                  GLsizei width, GLsizei height,
  99                  GLenum format, GLenum type, const GLvoid *pixels)
 100 {
 101    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 102    const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
 103    struct sw_span span;
 104
 105    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
 106
 107    if (!ctx->Current.RasterPosValid) {
 108       return GL_TRUE;      /* no-op */
 109    }
 110
 111    if (ctx->Depth.Test)
 112       _mesa_span_default_z(ctx, &span);
 113    if (ctx->Fog.Enabled)
 114       _mesa_span_default_fog(ctx, &span);
 115    if (ctx->Texture._EnabledUnits)
 116       _mesa_span_default_texcoords(ctx, &span);
 117
 118    if ((SWRAST_CONTEXT(ctx)->_RasterMask & ~CLIP_BIT) == 0
 119        && ctx->Texture._EnabledUnits == 0
 120        && unpack->Alignment == 1
 121        && !unpack->SwapBytes
 122        && !unpack->LsbFirst) {
 123
 124       GLint destX = x;
 125       GLint destY = y;
 126       GLint drawWidth = width;           /* actual width drawn */
 127       GLint drawHeight = height;         /* actual height drawn */
 128       GLint skipPixels = unpack->SkipPixels;
 129       GLint skipRows = unpack->SkipRows;
 130       GLint rowLength;
 131       GLdepth zSpan[MAX_WIDTH];  /* only used when zooming */
 132       GLint zoomY0 = 0;
 133
 134       if (unpack->RowLength > 0)
 135          rowLength = unpack->RowLength;
 136       else
 137          rowLength = width;
 138
 139       /* If we're not using pixel zoom then do all clipping calculations
 140        * now.  Otherwise, we'll let the _mesa_write_zoomed_*_span() functions
 141        * handle the clipping.
 142        */
 143       if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 144          /* horizontal clipping */
 145          if (destX < ctx->DrawBuffer->_Xmin) {
 146             skipPixels += (ctx->DrawBuffer->_Xmin - destX);
 147             drawWidth  -= (ctx->DrawBuffer->_Xmin - destX);
 148             destX = ctx->DrawBuffer->_Xmin;
 149          }
 150          if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
 151             drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
 152          if (drawWidth <= 0)
 153             return GL_TRUE;
 154
 155          /* vertical clipping */
 156          if (destY < ctx->DrawBuffer->_Ymin) {
 157             skipRows   += (ctx->DrawBuffer->_Ymin - destY);
 158             drawHeight -= (ctx->DrawBuffer->_Ymin - destY);
 159             destY = ctx->DrawBuffer->_Ymin;
 160          }
 161          if (destY + drawHeight > ctx->DrawBuffer->_Ymax)
 162             drawHeight -= (destY + drawHeight - ctx->DrawBuffer->_Ymax);
 163          if (drawHeight <= 0)
 164             return GL_TRUE;
 165       }
 166       else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 167          /* upside-down image */
 168          /* horizontal clipping */
 169          if (destX < ctx->DrawBuffer->_Xmin) {
 170             skipPixels += (ctx->DrawBuffer->_Xmin - destX);
 171             drawWidth  -= (ctx->DrawBuffer->_Xmin - destX);
 172             destX = ctx->DrawBuffer->_Xmin;
 173          }
 174          if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
 175             drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
 176          if (drawWidth <= 0)
 177             return GL_TRUE;
 178
 179          /* vertical clipping */
 180          if (destY > ctx->DrawBuffer->_Ymax) {
 181             skipRows   += (destY - ctx->DrawBuffer->_Ymax);
 182             drawHeight -= (destY - ctx->DrawBuffer->_Ymax);
 183             destY = ctx->DrawBuffer->_Ymax;
 184          }
 185          if (destY - drawHeight < ctx->DrawBuffer->_Ymin)
 186             drawHeight -= (ctx->DrawBuffer->_Ymin - (destY - drawHeight));
 187          if (drawHeight <= 0)
 188             return GL_TRUE;
 189       }
 190       else {
 191          /* setup array of fragment Z value to pass to zoom function */
 192          GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->DepthMaxF);
 193          GLint i;
 194          if (drawWidth < MAX_WIDTH)
 195             return GL_FALSE; /* take the general path solution */
 196          for (i=0; i<drawWidth; i++)
 197             zSpan[i] = z;
 198
 199          /* save Y value of first row */
 200          zoomY0 = IROUND(ctx->Current.RasterPos[1]);
 201       }
 202
 203
 204       /*
 205        * Ready to draw!
 206        * The window region at (destX, destY) of size (drawWidth, drawHeight)
 207        * will be written to.
 208        * We'll take pixel data from buffer pointed to by "pixels" but we'll
 209        * skip "skipRows" rows and skip "skipPixels" pixels/row.
 210        */
 211
 212       if (format == GL_RGBA && type == CHAN_TYPE
 213           && ctx->_ImageTransferState==0) {
 214          if (ctx->Visual.rgbMode) {
 215             GLchan *src = (GLchan *) pixels
 216                + (skipRows * rowLength + skipPixels) * 4;
 217             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 218                /* no zooming */
 219                GLint row;
 220                for (row=0; row<drawHeight; row++) {
 221                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 222                                               (CONST GLchan (*)[4]) src, NULL);
 223                   src += rowLength * 4;
 224                   destY++;
 225                }
 226             }
 227             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 228                /* upside-down */
 229                GLint row;
 230                for (row=0; row<drawHeight; row++) {
 231                   destY--;
 232                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 233                                               (CONST GLchan (*)[4]) src, NULL);
 234                   src += rowLength * 4;
 235                }
 236             }
 237             else {
 238                /* with zooming */
 239                GLint row;
 240                for (row=0; row<drawHeight; row++) {
 241                   span.x = destX;
 242                   span.y = destY;
 243                   span.end = drawWidth;
 244                   _mesa_write_zoomed_rgba_span(ctx, &span,
 245                                         (CONST GLchan (*)[4]) src, zoomY0, 0);
 246                   src += rowLength * 4;
 247                   destY++;
 248                }
 249             }
 250          }
 251          return GL_TRUE;
 252       }
 253       else if (format == GL_RGB && type == CHAN_TYPE
 254                && ctx->_ImageTransferState == 0) {
 255          if (ctx->Visual.rgbMode) {
 256             GLchan *src = (GLchan *) pixels
 257                + (skipRows * rowLength + skipPixels) * 3;
 258             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 259                GLint row;
 260                for (row=0; row<drawHeight; row++) {
 261                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 262                                               (CONST GLchan (*)[3]) src, NULL);
 263                   src += rowLength * 3;
 264                   destY++;
 265                }
 266             }
 267             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 268                /* upside-down */
 269                GLint row;
 270                for (row=0; row<drawHeight; row++) {
 271                   destY--;
 272                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 273                                               (CONST GLchan (*)[3]) src, NULL);
 274                   src += rowLength * 3;
 275                }
 276             }
 277             else {
 278                /* with zooming */
 279                GLint row;
 280                for (row=0; row<drawHeight; row++) {
 281                   span.x = destX;
 282                   span.y = destY;
 283                   span.end = drawWidth;
 284                   _mesa_write_zoomed_rgb_span(ctx, &span,
 285                                          (CONST GLchan (*)[3]) src, zoomY0, 0);
 286                   src += rowLength * 3;
 287                   destY++;
 288                }
 289             }
 290          }
 291          return GL_TRUE;
 292       }
 293       else if (format == GL_LUMINANCE && type == CHAN_TYPE
 294                && ctx->_ImageTransferState==0) {
 295          if (ctx->Visual.rgbMode) {
 296             GLchan *src = (GLchan *) pixels
 297                + (skipRows * rowLength + skipPixels);
 298             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 299                /* no zooming */
 300                GLint row;
 301                ASSERT(drawWidth < MAX_WIDTH);
 302                for (row=0; row<drawHeight; row++) {
 303                   GLint i;
 304                   for (i=0;i<drawWidth;i++) {
 305                      span.array->rgb[i][0] = src[i];
 306                      span.array->rgb[i][1] = src[i];
 307                      span.array->rgb[i][2] = src[i];
 308                   }
 309                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 310                                   (CONST GLchan (*)[3]) span.array->rgb, NULL);
 311                   src += rowLength;
 312                   destY++;
 313                }
 314             }
 315             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 316                /* upside-down */
 317                GLint row;
 318                ASSERT(drawWidth < MAX_WIDTH);
 319                for (row=0; row<drawHeight; row++) {
 320                   GLint i;
 321                   for (i=0;i<drawWidth;i++) {
 322                      span.array->rgb[i][0] = src[i];
 323                      span.array->rgb[i][1] = src[i];
 324                      span.array->rgb[i][2] = src[i];
 325                   }
 326                   destY--;
 327                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 328                                   (CONST GLchan (*)[3]) span.array->rgb, NULL);
 329                   src += rowLength;
 330                }
 331             }
 332             else {
 333                /* with zooming */
 334                GLint row;
 335                ASSERT(drawWidth < MAX_WIDTH);
 336                for (row=0; row<drawHeight; row++) {
 337                   GLint i;
 338                   for (i=0;i<drawWidth;i++) {
 339                      span.array->rgb[i][0] = src[i];
 340                      span.array->rgb[i][1] = src[i];
 341                      span.array->rgb[i][2] = src[i];
 342                   }
 343                   span.x = destX;
 344                   span.y = destY;
 345                   span.end = drawWidth;
 346                   _mesa_write_zoomed_rgb_span(ctx, &span,
 347                              (CONST GLchan (*)[3]) span.array->rgb, zoomY0, 0);
 348                   src += rowLength;
 349                   destY++;
 350                }
 351             }
 352          }
 353          return GL_TRUE;
 354       }
 355       else if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE
 356                && ctx->_ImageTransferState == 0) {
 357          if (ctx->Visual.rgbMode) {
 358             GLchan *src = (GLchan *) pixels
 359                + (skipRows * rowLength + skipPixels)*2;
 360             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 361                /* no zooming */
 362                GLint row;
 363                ASSERT(drawWidth < MAX_WIDTH);
 364                for (row=0; row<drawHeight; row++) {
 365                   GLint i;
 366                   GLchan *ptr = src;
 367                   for (i=0;i<drawWidth;i++) {
 368                      span.array->rgba[i][0] = *ptr;
 369                      span.array->rgba[i][1] = *ptr;
 370                      span.array->rgba[i][2] = *ptr++;
 371                      span.array->rgba[i][3] = *ptr++;
 372                   }
 373                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 374                                  (CONST GLchan (*)[4]) span.array->rgba, NULL);
 375                   src += rowLength*2;
 376                   destY++;
 377                }
 378             }
 379             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 380                /* upside-down */
 381                GLint row;
 382                ASSERT(drawWidth < MAX_WIDTH);
 383                for (row=0; row<drawHeight; row++) {
 384                   GLint i;
 385                   GLchan *ptr = src;
 386                   for (i=0;i<drawWidth;i++) {
 387                      span.array->rgba[i][0] = *ptr;
 388                      span.array->rgba[i][1] = *ptr;
 389                      span.array->rgba[i][2] = *ptr++;
 390                      span.array->rgba[i][3] = *ptr++;
 391                   }
 392                   destY--;
 393                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 394                                  (CONST GLchan (*)[4]) span.array->rgba, NULL);
 395                   src += rowLength*2;
 396                }
 397             }
 398             else {
 399                /* with zooming */
 400                GLint row;
 401                ASSERT(drawWidth < MAX_WIDTH);
 402                for (row=0; row<drawHeight; row++) {
 403                   GLchan *ptr = src;
 404                   GLint i;
 405                   for (i=0;i<drawWidth;i++) {
 406                      span.array->rgba[i][0] = *ptr;
 407                      span.array->rgba[i][1] = *ptr;
 408                      span.array->rgba[i][2] = *ptr++;
 409                      span.array->rgba[i][3] = *ptr++;
 410                   }
 411                   span.x = destX;
 412                   span.y = destY;
 413                   span.end = drawWidth;
 414                   _mesa_write_zoomed_rgba_span(ctx, &span,
 415                             (CONST GLchan (*)[4]) span.array->rgba, zoomY0, 0);
 416                   src += rowLength*2;
 417                   destY++;
 418                }
 419             }
 420          }
 421          return GL_TRUE;
 422       }
 423       else if (format==GL_COLOR_INDEX && type==GL_UNSIGNED_BYTE) {
 424          GLubyte *src = (GLubyte *) pixels + skipRows * rowLength + skipPixels;
 425          if (ctx->Visual.rgbMode) {
 426             /* convert CI data to RGBA */
 427             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 428                /* no zooming */
 429                GLint row;
 430                for (row=0; row<drawHeight; row++) {
 431                   ASSERT(drawWidth < MAX_WIDTH);
 432                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
 433                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 434                                  (const GLchan (*)[4]) span.array->rgba, NULL);
 435                   src += rowLength;
 436                   destY++;
 437                }
 438                return GL_TRUE;
 439             }
 440             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 441                /* upside-down */
 442                GLint row;
 443                for (row=0; row<drawHeight; row++) {
 444                   ASSERT(drawWidth < MAX_WIDTH);
 445                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
 446                   destY--;
 447                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 448                                  (CONST GLchan (*)[4]) span.array->rgba, NULL);
 449                   src += rowLength;
 450                }
 451                return GL_TRUE;
 452             }
 453             else {
 454                /* with zooming */
 455                GLint row;
 456                for (row=0; row<drawHeight; row++) {
 457                   ASSERT(drawWidth < MAX_WIDTH);
 458                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
 459                   span.x = destX;
 460                   span.y = destY;
 461                   span.end = drawWidth;
 462                   _mesa_write_zoomed_rgba_span(ctx, &span,
 463                             (CONST GLchan (*)[4]) span.array->rgba, zoomY0, 0);
 464                   src += rowLength;
 465                   destY++;
 466                }
 467                return GL_TRUE;
 468             }
 469          }
 470          else if (ctx->_ImageTransferState==0) {
 471             /* write CI data to CI frame buffer */
 472             GLint row;
 473             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 474                /* no zooming */
 475                for (row=0; row<drawHeight; row++) {
 476                   (*swrast->Driver.WriteCI8Span)(ctx, drawWidth, destX, destY,
 477                                               src, NULL);
 478                   src += rowLength;
 479                   destY++;
 480                }
 481                return GL_TRUE;
 482             }
 483             else {
 484                /* with zooming */
 485                return GL_FALSE;
 486             }
 487          }
 488       }
 489       else {
 490          /* can't handle this pixel format and/or data type here */
 491          return GL_FALSE;
 492       }
 493    }
 494
 495    /* can't do a simple draw, have to use slow path */
 496    return GL_FALSE;
 497 }
 498
 499
 500
 501 /*
 502  * Draw color index image.
 503  */
 504 static void
 505 draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
 506                    GLsizei width, GLsizei height,
 507                    GLenum type, const GLvoid *pixels )
 508 {
 509    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 510    GLint row, skipPixels;
 511    struct sw_span span;
 512
 513    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
 514
 515    if (ctx->Depth.Test)
 516       _mesa_span_default_z(ctx, &span);
 517    if (ctx->Fog.Enabled)
 518       _mesa_span_default_fog(ctx, &span);
 519
 520    /*
 521     * General solution
 522     */
 523    skipPixels = 0;
 524    while (skipPixels < width) {
 525       span.x = x + (zoom ? 0 : skipPixels);
 526       span.y = y;
 527       span.end = (width - skipPixels > MAX_WIDTH)
 528                ? MAX_WIDTH : (width - skipPixels);
 529       ASSERT(span.end <= MAX_WIDTH);
 530       for (row = 0; row < height; row++, span.y++) {
 531          const GLvoid *source = _mesa_image_address(&ctx->Unpack, pixels,
 532                                                     width, height,
 533                                                     GL_COLOR_INDEX, type,
 534                                                     0, row, skipPixels);
 535          _mesa_unpack_index_span(ctx, span.end, GL_UNSIGNED_INT,
 536                                  span.array->index, type, source, &ctx->Unpack,
 537                                  ctx->_ImageTransferState);
 538          if (zoom)
 539             _mesa_write_zoomed_index_span(ctx, &span, y, skipPixels);
 540          else
 541             _mesa_write_index_span(ctx, &span);
 542       }
 543       skipPixels += span.end;
 544    }
 545 }
 546
 547
 548
 549 /*
 550  * Draw stencil image.
 551  */
 552 static void
 553 draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
 554                      GLsizei width, GLsizei height,
 555                      GLenum type, const GLvoid *pixels )
 556 {
 557    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 558    const GLint desty = y;
 559    GLint row, skipPixels;
 560
 561    if (type != GL_BYTE &&
 562        type != GL_UNSIGNED_BYTE &&
 563        type != GL_SHORT &&
 564        type != GL_UNSIGNED_SHORT &&
 565        type != GL_INT &&
 566        type != GL_UNSIGNED_INT &&
 567        type != GL_FLOAT &&
 568        type != GL_BITMAP) {
 569       _mesa_error( ctx, GL_INVALID_ENUM, "glDrawPixels(stencil type)");
 570       return;
 571    }
 572
 573    if (ctx->Visual.stencilBits == 0) {
 574       _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawPixels(no stencil buffer)");
 575       return;
 576    }
 577
 578    /* if width > MAX_WIDTH, have to process image in chunks */
 579    skipPixels = 0;
 580    while (skipPixels < width) {
 581       GLint spanX = x;
 582       GLint spanY = y;
 583       GLint spanWidth = (width - skipPixels > MAX_WIDTH)
 584                       ? MAX_WIDTH : (width - skipPixels);
 585
 586       for (row = 0; row < height; row++, spanY++) {
 587          GLstencil values[MAX_WIDTH];
 588          GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
 589                          ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 590          const GLvoid *source = _mesa_image_address(&ctx->Unpack, pixels,
 591                                                     width, height,
 592                                                     GL_COLOR_INDEX, type,
 593                                                     0, row, skipPixels);
 594          _mesa_unpack_index_span(ctx, spanWidth, destType, values,
 595                                  type, source, &ctx->Unpack,
 596                                  ctx->_ImageTransferState);
 597          if (ctx->_ImageTransferState & IMAGE_SHIFT_OFFSET_BIT) {
 598             _mesa_shift_and_offset_stencil(ctx, spanWidth, values);
 599          }
 600          if (ctx->Pixel.MapStencilFlag) {
 601             _mesa_map_stencil(ctx, spanWidth, values);
 602          }
 603
 604          if (zoom) {
 605             _mesa_write_zoomed_stencil_span(ctx, (GLuint) spanWidth,
 606                                             spanX, spanY, values, desty, 0);
 607          }
 608          else {
 609             _mesa_write_stencil_span(ctx, (GLuint) spanWidth,
 610                                      spanX, spanY, values);
 611          }
 612       }
 613       skipPixels += spanWidth;
 614    }
 615 }
 616
 617
 618 /*
 619  * Draw depth image.
 620  */
 621 static void
 622 draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
 623                    GLsizei width, GLsizei height,
 624                    GLenum type, const GLvoid *pixels )
 625 {
 626    const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
 627    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 628    const GLint desty = y;
 629    struct sw_span span;
 630
 631    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
 632
 633    if (type != GL_BYTE
 634        && type != GL_UNSIGNED_BYTE
 635        && type != GL_SHORT
 636        && type != GL_UNSIGNED_SHORT
 637        && type != GL_INT
 638        && type != GL_UNSIGNED_INT
 639        && type != GL_FLOAT) {
 640       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)");
 641       return;
 642    }
 643
 644    _mesa_span_default_color(ctx, &span);
 645
 646    if (ctx->Fog.Enabled)
 647       _mesa_span_default_fog(ctx, &span);
 648    if (ctx->Texture._EnabledUnits)
 649       _mesa_span_default_texcoords(ctx, &span);
 650
 651    if (type == GL_UNSIGNED_SHORT && ctx->Visual.depthBits == 16
 652        && !bias_or_scale && !zoom && ctx->Visual.rgbMode
 653        && width < MAX_WIDTH) {
 654       /* Special case: directly write 16-bit depth values */
 655       GLint row;
 656       span.x = x;
 657       span.y = y;
 658       span.end = width;
 659       for (row = 0; row < height; row++, span.y++) {
 660          const GLushort *zptr = (const GLushort *)
 661             _mesa_image_address(&ctx->Unpack, pixels, width, height,
 662                                 GL_DEPTH_COMPONENT, type, 0, row, 0);
 663          GLint i;
 664          for (i = 0; i < width; i++)
 665             span.array->z[i] = zptr[i];
 666          _mesa_write_rgba_span(ctx, &span);
 667       }
 668    }
 669    else if (type == GL_UNSIGNED_INT && ctx->Visual.depthBits == 32
 670             && !bias_or_scale && !zoom && ctx->Visual.rgbMode
 671             && width < MAX_WIDTH) {
 672       /* Special case: directly write 32-bit depth values */
 673       GLint row;
 674       span.x = x;
 675       span.y = y;
 676       span.end = width;
 677       for (row = 0; row < height; row++, span.y++) {
 678          const GLuint *zptr = (const GLuint *)
 679             _mesa_image_address(&ctx->Unpack, pixels, width, height,
 680                                 GL_DEPTH_COMPONENT, type, 0, row, 0);
 681          MEMCPY(span.array->z, zptr, width * sizeof(GLdepth));
 682          _mesa_write_rgba_span(ctx, &span);
 683       }
 684    }
 685    else {
 686       /* General case */
 687       GLint row, skipPixels = 0;
 688
 689       /* in case width > MAX_WIDTH do the copy in chunks */
 690       while (skipPixels < width) {
 691          span.x = x + (zoom ? 0 : skipPixels);
 692          span.y = y;
 693          span.end = (width - skipPixels > MAX_WIDTH)
 694                   ? MAX_WIDTH : (width - skipPixels);
 695          ASSERT(span.end <= MAX_WIDTH);
 696          for (row = 0; row < height; row++, span.y++) {
 697             GLfloat floatSpan[MAX_WIDTH];
 698             const GLvoid *src = _mesa_image_address(&ctx->Unpack,
 699                                                     pixels, width, height,
 700                                                     GL_DEPTH_COMPONENT, type,
 701                                                     0, row, skipPixels);
 702             _mesa_unpack_depth_span(ctx, span.end, floatSpan, type,
 703                                     src, &ctx->Unpack);
 704             /* clamp depth values to [0,1] and convert from floats to ints */
 705             {
 706                const GLfloat zs = ctx->DepthMaxF;
 707                GLint i;
 708                for (i = 0; i < span.end; i++) {
 709                   span.array->z[i] = (GLdepth) (floatSpan[i] * zs + 0.5F);
 710                }
 711             }
 712             if (ctx->Visual.rgbMode) {
 713                if (zoom) {
 714                   _mesa_write_zoomed_rgba_span(ctx, &span,
 715                                      (const GLchan (*)[4]) span.array->rgba,
 716                                      desty, skipPixels);
 717                }
 718                else
 719                   _mesa_write_rgba_span(ctx, &span);
 720             }
 721             else {
 722                if (zoom)
 723                   _mesa_write_zoomed_index_span(ctx, &span, desty, 0);
 724                else
 725                   _mesa_write_index_span(ctx, &span);
 726             }
 727          }
 728          skipPixels += span.end;
 729       }
 730    }
 731 }
 732
 733
 734
 735 /*
 736  * Draw RGBA image.
 737  */
 738 static void
 739 draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
 740                   GLsizei width, GLsizei height,
 741                   GLenum format, GLenum type, const GLvoid *pixels )
 742 {
 743    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 744    const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
 745    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 746    const GLint desty = y;
 747    GLboolean quickDraw;
 748    GLfloat *convImage = NULL;
 749    GLuint transferOps = ctx->_ImageTransferState;
 750    struct sw_span span;
 751
 752    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
 753
 754    if (!_mesa_is_legal_format_and_type(format, type)) {
 755       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(format or type)");
 756       return;
 757    }
 758
 759    /* Try an optimized glDrawPixels first */
 760    if (fast_draw_pixels(ctx, x, y, width, height, format, type, pixels))
 761       return;
 762
 763    if (ctx->Depth.Test)
 764       _mesa_span_default_z(ctx, &span);
 765    if (ctx->Fog.Enabled)
 766       _mesa_span_default_fog(ctx, &span);
 767    if (ctx->Texture._EnabledUnits)
 768       _mesa_span_default_texcoords(ctx, &span);
 769
 770    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0 && !zoom && x >= 0 && y >= 0
 771        && x + width <= (GLint) ctx->DrawBuffer->Width
 772        && y + height <= (GLint) ctx->DrawBuffer->Height) {
 773       quickDraw = GL_TRUE;
 774    }
 775    else {
 776       quickDraw = GL_FALSE;
 777    }
 778
 779    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 780       /* Convolution has to be handled specially.  We'll create an
 781        * intermediate image, applying all pixel transfer operations
 782        * up to convolution.  Then we'll convolve the image.  Then
 783        * we'll proceed with the rest of the transfer operations and
 784        * rasterize the image.
 785        */
 786       GLint row;
 787       GLfloat *dest, *tmpImage;
 788
 789       tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 790       if (!tmpImage) {
 791          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 792          return;
 793       }
 794       convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 795       if (!convImage) {
 796          FREE(tmpImage);
 797          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 798          return;
 799       }
 800
 801       /* Unpack the image and apply transfer ops up to convolution */
 802       dest = tmpImage;
 803       for (row = 0; row < height; row++) {
 804          const GLvoid *source = _mesa_image_address(unpack,
 805                   pixels, width, height, format, type, 0, row, 0);
 806          _mesa_unpack_float_color_span(ctx, width, GL_RGBA, (GLfloat *) dest,
 807                                       format, type, source, unpack,
 808                                       transferOps & IMAGE_PRE_CONVOLUTION_BITS,
 809                                       GL_FALSE);
 810          dest += width * 4;
 811       }
 812
 813       /* do convolution */
 814       if (ctx->Pixel.Convolution2DEnabled) {
 815          _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 816       }
 817       else {
 818          ASSERT(ctx->Pixel.Separable2DEnabled);
 819          _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 820       }
 821       FREE(tmpImage);
 822
 823       /* continue transfer ops and draw the convolved image */
 824       unpack = &_mesa_native_packing;
 825       pixels = convImage;
 826       format = GL_RGBA;
 827       type = GL_FLOAT;
 828       transferOps &= IMAGE_POST_CONVOLUTION_BITS;
 829    }
 830
 831    /*
 832     * General solution
 833     */
 834    {
 835       GLint row, skipPixels = 0;
 836
 837       /* if the span is wider than MAX_WIDTH we have to do it in chunks */
 838       while (skipPixels < width) {
 839          span.x = x + (zoom ? 0 : skipPixels);
 840          span.y = y;
 841          span.end = (width - skipPixels > MAX_WIDTH)
 842                   ? MAX_WIDTH : (width - skipPixels);
 843          ASSERT(span.end <= MAX_WIDTH);
 844
 845          for (row = 0; row < height; row++, span.y++) {
 846             const GLvoid *source = _mesa_image_address(unpack,
 847                      pixels, width, height, format, type, 0, row, skipPixels);
 848
 849             _mesa_unpack_chan_color_span(ctx, span.end, GL_RGBA,
 850                                          (GLchan *) span.array->rgba,
 851                                          format, type, source, unpack,
 852                                          transferOps);
 853
 854             if ((ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink) ||
 855                 (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink))
 856                continue;
 857
 858             if (ctx->Pixel.PixelTextureEnabled && ctx->Texture._EnabledUnits) {
 859                _swrast_pixel_texture(ctx, &span);
 860             }
 861
 862             if (quickDraw) {
 863                (*swrast->Driver.WriteRGBASpan)(ctx, span.end, span.x, span.y,
 864                                  (CONST GLchan (*)[4]) span.array->rgba, NULL);
 865             }
 866             else if (zoom) {
 867                _mesa_write_zoomed_rgba_span(ctx, &span,
 868                     (CONST GLchan (*)[4]) span.array->rgba, desty, skipPixels);
 869             }
 870             else {
 871                _mesa_write_rgba_span(ctx, &span);
 872             }
 873          }
 874          skipPixels += span.end;
 875       }
 876    }
 877
 878    if (convImage) {
 879       FREE(convImage);
 880    }
 881 }
 882
 883
 884
 885 /*
 886  * Execute glDrawPixels
 887  */
 888 void
 889 _swrast_DrawPixels( GLcontext *ctx,
 890                     GLint x, GLint y,
 891                     GLsizei width, GLsizei height,
 892                     GLenum format, GLenum type,
 893                     const struct gl_pixelstore_attrib *unpack,
 894                     const GLvoid *pixels )
 895 {
 896    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 897    (void) unpack;
 898
 899    if (swrast->NewState)
 900       _swrast_validate_derived( ctx );
 901
 902    RENDER_START(swrast,ctx);
 903
 904    switch (format) {
 905    case GL_STENCIL_INDEX:
 906       draw_stencil_pixels( ctx, x, y, width, height, type, pixels );
 907       break;
 908    case GL_DEPTH_COMPONENT:
 909       draw_depth_pixels( ctx, x, y, width, height, type, pixels );
 910       break;
 911    case GL_COLOR_INDEX:
 912       if (ctx->Visual.rgbMode)
 913          draw_rgba_pixels(ctx, x,y, width, height, format, type, pixels);
 914       else
 915          draw_index_pixels(ctx, x, y, width, height, type, pixels);
 916       break;
 917    case GL_RED:
 918    case GL_GREEN:
 919    case GL_BLUE:
 920    case GL_ALPHA:
 921    case GL_LUMINANCE:
 922    case GL_LUMINANCE_ALPHA:
 923    case GL_RGB:
 924    case GL_BGR:
 925    case GL_RGBA:
 926    case GL_BGRA:
 927    case GL_ABGR_EXT:
 928       draw_rgba_pixels(ctx, x, y, width, height, format, type, pixels);
 929       break;
 930    default:
 931       _mesa_error( ctx, GL_INVALID_ENUM, "glDrawPixels(format)" );
 932    }
 933
 934    RENDER_FINISH(swrast,ctx);
 935 }
 936
 937
 938
 939 #if 0  /* experimental */
 940 /*
 941  * Execute glDrawDepthPixelsMESA().
 942  */
 943 void
 944 _swrast_DrawDepthPixelsMESA( GLcontext *ctx,
 945                              GLint x, GLint y,
 946                              GLsizei width, GLsizei height,
 947                              GLenum colorFormat, GLenum colorType,
 948                              const GLvoid *colors,
 949                              GLenum depthType, const GLvoid *depths,
 950                              const struct gl_pixelstore_attrib *unpack )
 951 {
 952    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 953    (void) unpack;
 954
 955    if (swrast->NewState)
 956       _swrast_validate_derived( ctx );
 957
 958    RENDER_START(swrast,ctx);
 959
 960    switch (colorFormat) {
 961    case GL_COLOR_INDEX:
 962       if (ctx->Visual.rgbMode)
 963          draw_rgba_pixels(ctx, x,y, width, height, colorFormat, colorType, colors);
 964       else
 965          draw_index_pixels(ctx, x, y, width, height, colorType, colors);
 966       break;
 967    case GL_RED:
 968    case GL_GREEN:
 969    case GL_BLUE:
 970    case GL_ALPHA:
 971    case GL_LUMINANCE:
 972    case GL_LUMINANCE_ALPHA:
 973    case GL_RGB:
 974    case GL_BGR:
 975    case GL_RGBA:
 976    case GL_BGRA:
 977    case GL_ABGR_EXT:
 978       draw_rgba_pixels(ctx, x, y, width, height, colorFormat, colorType, colors);
 979       break;
 980    default:
 981       _mesa_error( ctx, GL_INVALID_ENUM,
 982                    "glDrawDepthPixelsMESA(colorFormat)" );
 983    }
 984
 985    RENDER_FINISH(swrast,ctx);
 986 }
 987 #endif