src/mesa/swrast/s_drawpix.c

   1 /* $Id: s_drawpix.c,v 1.1 2000/10/31 18:00:04 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 "image.h"
  33 #include "macros.h"
  34 #include "mem.h"
  35 #include "mmath.h"
  36 #include "pixel.h"
  37
  38 #include "s_pixeltex.h"
  39 #include "s_span.h"
  40 #include "s_stencil.h"
  41 #include "s_texture.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    const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
 102    GLchan rgb[MAX_WIDTH][3];
 103    GLchan rgba[MAX_WIDTH][4];
 104
 105    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glDrawPixels",
 106                                                   GL_FALSE);
 107
 108
 109    if (!ctx->Current.RasterPosValid) {
 110       return GL_TRUE;      /* no-op */
 111    }
 112
 113    if ((ctx->RasterMask&(~(SCISSOR_BIT|WINCLIP_BIT)))==0
 114        && ctx->Texture.ReallyEnabled == 0
 115        && unpack->Alignment == 1
 116        && !unpack->SwapBytes
 117        && !unpack->LsbFirst) {
 118
 119       GLint destX = x;
 120       GLint destY = y;
 121       GLint drawWidth = width;           /* actual width drawn */
 122       GLint drawHeight = height;         /* actual height drawn */
 123       GLint skipPixels = unpack->SkipPixels;
 124       GLint skipRows = unpack->SkipRows;
 125       GLint rowLength;
 126       GLdepth zSpan[MAX_WIDTH];  /* only used when zooming */
 127       GLint zoomY0 = 0;
 128
 129       if (unpack->RowLength > 0)
 130          rowLength = unpack->RowLength;
 131       else
 132          rowLength = width;
 133
 134       /* If we're not using pixel zoom then do all clipping calculations
 135        * now.  Otherwise, we'll let the gl_write_zoomed_*_span() functions
 136        * handle the clipping.
 137        */
 138       if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 139          /* horizontal clipping */
 140          if (destX < ctx->DrawBuffer->Xmin) {
 141             skipPixels += (ctx->DrawBuffer->Xmin - destX);
 142             drawWidth  -= (ctx->DrawBuffer->Xmin - destX);
 143             destX = ctx->DrawBuffer->Xmin;
 144          }
 145          if (destX + drawWidth > ctx->DrawBuffer->Xmax)
 146             drawWidth -= (destX + drawWidth - ctx->DrawBuffer->Xmax);
 147          if (drawWidth <= 0)
 148             return GL_TRUE;
 149
 150          /* vertical clipping */
 151          if (destY < ctx->DrawBuffer->Ymin) {
 152             skipRows   += (ctx->DrawBuffer->Ymin - destY);
 153             drawHeight -= (ctx->DrawBuffer->Ymin - destY);
 154             destY = ctx->DrawBuffer->Ymin;
 155          }
 156          if (destY + drawHeight > ctx->DrawBuffer->Ymax)
 157             drawHeight -= (destY + drawHeight - ctx->DrawBuffer->Ymax);
 158          if (drawHeight <= 0)
 159             return GL_TRUE;
 160       }
 161       else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 162          /* upside-down image */
 163          /* horizontal clipping */
 164          if (destX < ctx->DrawBuffer->Xmin) {
 165             skipPixels += (ctx->DrawBuffer->Xmin - destX);
 166             drawWidth  -= (ctx->DrawBuffer->Xmin - destX);
 167             destX = ctx->DrawBuffer->Xmin;
 168          }
 169          if (destX + drawWidth > ctx->DrawBuffer->Xmax)
 170             drawWidth -= (destX + drawWidth - ctx->DrawBuffer->Xmax);
 171          if (drawWidth <= 0)
 172             return GL_TRUE;
 173
 174          /* vertical clipping */
 175          if (destY > ctx->DrawBuffer->Ymax) {
 176             skipRows   += (destY - ctx->DrawBuffer->Ymax);
 177             drawHeight -= (destY - ctx->DrawBuffer->Ymax);
 178             destY = ctx->DrawBuffer->Ymax;
 179          }
 180          if (destY - drawHeight < ctx->DrawBuffer->Ymin)
 181             drawHeight -= (ctx->DrawBuffer->Ymin - (destY - drawHeight));
 182          if (drawHeight <= 0)
 183             return GL_TRUE;
 184       }
 185       else {
 186          /* setup array of fragment Z value to pass to zoom function */
 187          GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
 188          GLint i;
 189          ASSERT(drawWidth < MAX_WIDTH);
 190          for (i=0; i<drawWidth; i++)
 191             zSpan[i] = z;
 192
 193          /* save Y value of first row */
 194          zoomY0 = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
 195       }
 196
 197
 198       /*
 199        * Ready to draw!
 200        * The window region at (destX, destY) of size (drawWidth, drawHeight)
 201        * will be written to.
 202        * We'll take pixel data from buffer pointed to by "pixels" but we'll
 203        * skip "skipRows" rows and skip "skipPixels" pixels/row.
 204        */
 205
 206       if (format == GL_RGBA && type == CHAN_TYPE
 207           && ctx->ImageTransferState==0) {
 208          if (ctx->Visual.RGBAflag) {
 209             GLchan *src = (GLchan *) pixels
 210                + (skipRows * rowLength + skipPixels) * 4;
 211             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 212                /* no zooming */
 213                GLint row;
 214                for (row=0; row<drawHeight; row++) {
 215                   (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 216                                                (void *) src, NULL);
 217                   src += rowLength * 4;
 218                   destY++;
 219                }
 220             }
 221             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 222                /* upside-down */
 223                GLint row;
 224                for (row=0; row<drawHeight; row++) {
 225                   destY--;
 226                   (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 227                                               (void *) src, NULL);
 228                   src += rowLength * 4;
 229                }
 230             }
 231             else {
 232                /* with zooming */
 233                GLint row;
 234                for (row=0; row<drawHeight; row++) {
 235                   gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
 236                                             zSpan, 0, (void *) src, zoomY0);
 237                   src += rowLength * 4;
 238                   destY++;
 239                }
 240             }
 241          }
 242          return GL_TRUE;
 243       }
 244       else if (format == GL_RGB && type == CHAN_TYPE
 245                && ctx->ImageTransferState == 0) {
 246          if (ctx->Visual.RGBAflag) {
 247             GLchan *src = (GLchan *) pixels
 248                + (skipRows * rowLength + skipPixels) * 3;
 249             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 250                GLint row;
 251                for (row=0; row<drawHeight; row++) {
 252                   (*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 253                                               (void *) src, NULL);
 254                   src += rowLength * 3;
 255                   destY++;
 256                }
 257             }
 258             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 259                /* upside-down */
 260                GLint row;
 261                for (row=0; row<drawHeight; row++) {
 262                   destY--;
 263                   (*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 264                                               (void *) src, NULL);
 265                   src += rowLength * 3;
 266                }
 267             }
 268             else {
 269                /* with zooming */
 270                GLint row;
 271                for (row=0; row<drawHeight; row++) {
 272                   gl_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
 273                                            zSpan, 0, (void *) src, zoomY0);
 274                   src += rowLength * 3;
 275                   destY++;
 276                }
 277             }
 278          }
 279          return GL_TRUE;
 280       }
 281       else if (format == GL_LUMINANCE && type == CHAN_TYPE
 282                && ctx->ImageTransferState==0) {
 283          if (ctx->Visual.RGBAflag) {
 284             GLchan *src = (GLchan *) pixels
 285                + (skipRows * rowLength + skipPixels);
 286             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 287                /* no zooming */
 288                GLint row;
 289                ASSERT(drawWidth < MAX_WIDTH);
 290                for (row=0; row<drawHeight; row++) {
 291                   GLint i;
 292                   for (i=0;i<drawWidth;i++) {
 293                      rgb[i][0] = src[i];
 294                      rgb[i][1] = src[i];
 295                      rgb[i][2] = src[i];
 296                   }
 297                   (*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 298                                               (void *) rgb, NULL);
 299                   src += rowLength;
 300                   destY++;
 301                }
 302             }
 303             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 304                /* upside-down */
 305                GLint row;
 306                ASSERT(drawWidth < MAX_WIDTH);
 307                for (row=0; row<drawHeight; row++) {
 308                   GLint i;
 309                   for (i=0;i<drawWidth;i++) {
 310                      rgb[i][0] = src[i];
 311                      rgb[i][1] = src[i];
 312                      rgb[i][2] = src[i];
 313                   }
 314                   destY--;
 315                   (*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 316                                               (void *) rgb, NULL);
 317                   src += rowLength;
 318                }
 319             }
 320             else {
 321                /* with zooming */
 322                GLint row;
 323                ASSERT(drawWidth < MAX_WIDTH);
 324                for (row=0; row<drawHeight; row++) {
 325                   GLint i;
 326                   for (i=0;i<drawWidth;i++) {
 327                      rgb[i][0] = src[i];
 328                      rgb[i][1] = src[i];
 329                      rgb[i][2] = src[i];
 330                   }
 331                   gl_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
 332                                            zSpan, 0, (void *) rgb, zoomY0);
 333                   src += rowLength;
 334                   destY++;
 335                }
 336             }
 337          }
 338          return GL_TRUE;
 339       }
 340       else if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE
 341                && ctx->ImageTransferState == 0) {
 342          if (ctx->Visual.RGBAflag) {
 343             GLchan *src = (GLchan *) pixels
 344                + (skipRows * rowLength + skipPixels)*2;
 345             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 346                /* no zooming */
 347                GLint row;
 348                ASSERT(drawWidth < MAX_WIDTH);
 349                for (row=0; row<drawHeight; row++) {
 350                   GLint i;
 351                   GLchan *ptr = src;
 352                   for (i=0;i<drawWidth;i++) {
 353                      rgba[i][0] = *ptr;
 354                      rgba[i][1] = *ptr;
 355                      rgba[i][2] = *ptr++;
 356                      rgba[i][3] = *ptr++;
 357                   }
 358                   (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 359                                                (void *) rgba, NULL);
 360                   src += rowLength*2;
 361                   destY++;
 362                }
 363             }
 364             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 365                /* upside-down */
 366                GLint row;
 367                ASSERT(drawWidth < MAX_WIDTH);
 368                for (row=0; row<drawHeight; row++) {
 369                   GLint i;
 370                   GLchan *ptr = src;
 371                   for (i=0;i<drawWidth;i++) {
 372                      rgba[i][0] = *ptr;
 373                      rgba[i][1] = *ptr;
 374                      rgba[i][2] = *ptr++;
 375                      rgba[i][3] = *ptr++;
 376                   }
 377                   destY--;
 378                   (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 379                                                (void *) rgba, NULL);
 380                   src += rowLength*2;
 381                }
 382             }
 383             else {
 384                /* with zooming */
 385                GLint row;
 386                ASSERT(drawWidth < MAX_WIDTH);
 387                for (row=0; row<drawHeight; row++) {
 388                   GLchan *ptr = src;
 389                   GLint i;
 390                   for (i=0;i<drawWidth;i++) {
 391                      rgba[i][0] = *ptr;
 392                      rgba[i][1] = *ptr;
 393                      rgba[i][2] = *ptr++;
 394                      rgba[i][3] = *ptr++;
 395                   }
 396                   gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
 397                                             zSpan, 0, (void *) rgba, zoomY0);
 398                   src += rowLength*2;
 399                   destY++;
 400                }
 401             }
 402          }
 403          return GL_TRUE;
 404       }
 405       else if (format==GL_COLOR_INDEX && type==GL_UNSIGNED_BYTE) {
 406          GLubyte *src = (GLubyte *) pixels + skipRows * rowLength + skipPixels;
 407          if (ctx->Visual.RGBAflag) {
 408             /* convert CI data to RGBA */
 409             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 410                /* no zooming */
 411                GLint row;
 412                for (row=0; row<drawHeight; row++) {
 413                   ASSERT(drawWidth < MAX_WIDTH);
 414                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
 415                   (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 416                                                (const GLchan (*)[4]) rgba,
 417                                                NULL);
 418                   src += rowLength;
 419                   destY++;
 420                }
 421                return GL_TRUE;
 422             }
 423             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 424                /* upside-down */
 425                GLint row;
 426                for (row=0; row<drawHeight; row++) {
 427                   ASSERT(drawWidth < MAX_WIDTH);
 428                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
 429                   destY--;
 430                   (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 431                                                (const GLchan (*)[4]) rgba,
 432                                                NULL);
 433                   src += rowLength;
 434                }
 435                return GL_TRUE;
 436             }
 437             else {
 438                /* with zooming */
 439                GLint row;
 440                for (row=0; row<drawHeight; row++) {
 441                   ASSERT(drawWidth < MAX_WIDTH);
 442                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
 443                   gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
 444                                             zSpan, 0, (void *) rgba, zoomY0);
 445                   src += rowLength;
 446                   destY++;
 447                }
 448                return GL_TRUE;
 449             }
 450          }
 451          else if (ctx->ImageTransferState==0) {
 452             /* write CI data to CI frame buffer */
 453             GLint row;
 454             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 455                /* no zooming */
 456                for (row=0; row<drawHeight; row++) {
 457                   (*ctx->Driver.WriteCI8Span)(ctx, drawWidth, destX, destY,
 458                                               src, NULL);
 459                   src += rowLength;
 460                   destY++;
 461                }
 462                return GL_TRUE;
 463             }
 464             else {
 465                /* with zooming */
 466                return GL_FALSE;
 467             }
 468          }
 469       }
 470       else {
 471          /* can't handle this pixel format and/or data type here */
 472          return GL_FALSE;
 473       }
 474    }
 475
 476    /* can't do a simple draw, have to use slow path */
 477    return GL_FALSE;
 478 }
 479
 480
 481
 482 /*
 483  * Do glDrawPixels of index pixels.
 484  */
 485 static void
 486 draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
 487                    GLsizei width, GLsizei height,
 488                    GLenum type, const GLvoid *pixels )
 489 {
 490    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 491    const GLint desty = y;
 492    GLint row, drawWidth;
 493    GLdepth zspan[MAX_WIDTH];
 494
 495    drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
 496
 497    /* Fragment depth values */
 498    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 499       GLdepth zval = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
 500       GLint i;
 501       for (i = 0; i < drawWidth; i++) {
 502          zspan[i] = zval;
 503       }
 504    }
 505
 506    /*
 507     * General solution
 508     */
 509    for (row = 0; row < height; row++, y++) {
 510       GLuint indexes[MAX_WIDTH];
 511       const GLvoid *source = _mesa_image_address(&ctx->Unpack,
 512                     pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0);
 513       _mesa_unpack_index_span(ctx, drawWidth, GL_UNSIGNED_INT, indexes,
 514                               type, source, &ctx->Unpack,
 515                               ctx->ImageTransferState);
 516       if (zoom) {
 517          gl_write_zoomed_index_span(ctx, drawWidth, x, y, zspan, 0, indexes, desty);
 518       }
 519       else {
 520          gl_write_index_span(ctx, drawWidth, x, y, zspan, 0, indexes, GL_BITMAP);
 521       }
 522    }
 523 }
 524
 525
 526
 527 /*
 528  * Do glDrawPixels of stencil image.  The image datatype may either
 529  * be GLubyte or GLbitmap.
 530  */
 531 static void
 532 draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
 533                      GLsizei width, GLsizei height,
 534                      GLenum type, const GLvoid *pixels )
 535 {
 536    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 537    const GLint desty = y;
 538    GLint row, drawWidth;
 539
 540    if (type != GL_BYTE &&
 541        type != GL_UNSIGNED_BYTE &&
 542        type != GL_SHORT &&
 543        type != GL_UNSIGNED_SHORT &&
 544        type != GL_INT &&
 545        type != GL_UNSIGNED_INT &&
 546        type != GL_FLOAT &&
 547        type != GL_BITMAP) {
 548       gl_error( ctx, GL_INVALID_ENUM, "glDrawPixels(stencil type)");
 549       return;
 550    }
 551
 552    drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
 553
 554    for (row = 0; row < height; row++, y++) {
 555       GLstencil values[MAX_WIDTH];
 556       GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
 557                       ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 558       const GLvoid *source = _mesa_image_address(&ctx->Unpack,
 559                     pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0);
 560       _mesa_unpack_index_span(ctx, drawWidth, destType, values,
 561                               type, source, &ctx->Unpack,
 562                               ctx->ImageTransferState);
 563       if (ctx->ImageTransferState & IMAGE_SHIFT_OFFSET_BIT) {
 564          _mesa_shift_and_offset_stencil( ctx, drawWidth, values );
 565       }
 566       if (ctx->Pixel.MapStencilFlag) {
 567          _mesa_map_stencil( ctx, drawWidth, values );
 568       }
 569
 570       if (zoom) {
 571          gl_write_zoomed_stencil_span( ctx, (GLuint) drawWidth, x, y,
 572                                        values, desty );
 573       }
 574       else {
 575          _mesa_write_stencil_span( ctx, (GLuint) drawWidth, x, y, values );
 576       }
 577    }
 578 }
 579
 580
 581
 582 /*
 583  * Do a glDrawPixels of depth values.
 584  */
 585 static void
 586 draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
 587                    GLsizei width, GLsizei height,
 588                    GLenum type, const GLvoid *pixels )
 589 {
 590    const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
 591    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 592    const GLint desty = y;
 593    GLchan rgba[MAX_WIDTH][4];
 594    GLuint ispan[MAX_WIDTH];
 595    GLint drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
 596
 597    if (type != GL_BYTE
 598        && type != GL_UNSIGNED_BYTE
 599        && type != GL_SHORT
 600        && type != GL_UNSIGNED_SHORT
 601        && type != GL_INT
 602        && type != GL_UNSIGNED_INT
 603        && type != GL_FLOAT) {
 604       gl_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)");
 605       return;
 606    }
 607
 608    /* Colors or indexes */
 609    if (ctx->Visual.RGBAflag) {
 610       GLint r = FLOAT_TO_CHAN(ctx->Current.RasterColor[0]);
 611       GLint g = FLOAT_TO_CHAN(ctx->Current.RasterColor[1]);
 612       GLint b = FLOAT_TO_CHAN(ctx->Current.RasterColor[2]);
 613       GLint a = FLOAT_TO_CHAN(ctx->Current.RasterColor[3]);
 614       GLint i;
 615       for (i = 0; i < drawWidth; i++) {
 616          rgba[i][RCOMP] = r;
 617          rgba[i][GCOMP] = g;
 618          rgba[i][BCOMP] = b;
 619          rgba[i][ACOMP] = a;
 620       }
 621    }
 622    else {
 623       GLint i;
 624       for (i = 0; i < drawWidth; i++) {
 625          ispan[i] = ctx->Current.RasterIndex;
 626       }
 627    }
 628
 629    if (type==GL_UNSIGNED_SHORT && sizeof(GLdepth)==sizeof(GLushort)
 630        && !bias_or_scale && !zoom && ctx->Visual.RGBAflag) {
 631       /* Special case: directly write 16-bit depth values */
 632       GLint row;
 633       for (row = 0; row < height; row++, y++) {
 634          GLdepth zspan[MAX_WIDTH];
 635          const GLushort *zptr = _mesa_image_address(&ctx->Unpack,
 636                 pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
 637          GLint i;
 638          for (i = 0; i < width; i++)
 639             zspan[i] = zptr[i];
 640          gl_write_rgba_span( ctx, width, x, y, zspan, 0, rgba, GL_BITMAP );
 641       }
 642    }
 643    else if (type==GL_UNSIGNED_INT && ctx->Visual.DepthBits == 32
 644        && !bias_or_scale && !zoom && ctx->Visual.RGBAflag) {
 645       /* Special case: directly write 32-bit depth values */
 646       GLint row;
 647       for (row = 0; row < height; row++, y++) {
 648          const GLuint *zptr = _mesa_image_address(&ctx->Unpack,
 649                 pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
 650          gl_write_rgba_span( ctx, width, x, y, zptr, 0, rgba, GL_BITMAP );
 651       }
 652    }
 653    else {
 654       /* General case */
 655       GLint row;
 656       for (row = 0; row < height; row++, y++) {
 657          GLdepth zspan[MAX_WIDTH];
 658          const GLvoid *src = _mesa_image_address(&ctx->Unpack,
 659                 pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
 660          _mesa_unpack_depth_span( ctx, drawWidth, zspan, type, src,
 661                                   &ctx->Unpack, ctx->ImageTransferState );
 662          if (ctx->Visual.RGBAflag) {
 663             if (zoom) {
 664                gl_write_zoomed_rgba_span(ctx, width, x, y, zspan, 0,
 665                                          (const GLchan (*)[4]) rgba, desty);
 666             }
 667             else {
 668                gl_write_rgba_span(ctx, width, x, y, zspan, 0, rgba, GL_BITMAP);
 669             }
 670          }
 671          else {
 672             if (zoom) {
 673                gl_write_zoomed_index_span(ctx, width, x, y, zspan, 0,
 674                                           ispan, GL_BITMAP);
 675             }
 676             else {
 677                gl_write_index_span(ctx, width, x, y, zspan, 0,
 678                                    ispan, GL_BITMAP);
 679             }
 680          }
 681
 682       }
 683    }
 684 }
 685
 686
 687 /*
 688  * Do glDrawPixels of RGBA pixels.
 689  */
 690 static void
 691 draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
 692                   GLsizei width, GLsizei height,
 693                   GLenum format, GLenum type, const GLvoid *pixels )
 694 {
 695    const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
 696    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 697    const GLint desty = y;
 698    GLdepth zspan[MAX_WIDTH];
 699    GLboolean quickDraw;
 700    GLfloat *convImage = NULL;
 701    GLuint transferOps = ctx->ImageTransferState;
 702
 703    if (!_mesa_is_legal_format_and_type(format, type)) {
 704       gl_error(ctx, GL_INVALID_ENUM, "glDrawPixels(format or type)");
 705       return;
 706    }
 707
 708    /* Try an optimized glDrawPixels first */
 709    if (fast_draw_pixels(ctx, x, y, width, height, format, type, pixels))
 710       return;
 711
 712    /* Fragment depth values */
 713    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 714       /* fill in array of z values */
 715       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
 716       GLint i;
 717       for (i=0;i<width;i++) {
 718          zspan[i] = z;
 719       }
 720    }
 721
 722
 723    if (ctx->RasterMask == 0 && !zoom && x >= 0 && y >= 0
 724        && x + width <= ctx->DrawBuffer->Width
 725        && y + height <= ctx->DrawBuffer->Height) {
 726       quickDraw = GL_TRUE;
 727    }
 728    else {
 729       quickDraw = GL_FALSE;
 730    }
 731
 732    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 733       /* Convolution has to be handled specially.  We'll create an
 734        * intermediate image, applying all pixel transfer operations
 735        * up to convolution.  Then we'll convolve the image.  Then
 736        * we'll proceed with the rest of the transfer operations and
 737        * rasterize the image.
 738        */
 739       GLint row;
 740       GLfloat *dest, *tmpImage;
 741
 742       tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 743       if (!tmpImage) {
 744          gl_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 745          return;
 746       }
 747       convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 748       if (!convImage) {
 749          FREE(tmpImage);
 750          gl_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 751          return;
 752       }
 753
 754       /* Unpack the image and apply transfer ops up to convolution */
 755       dest = tmpImage;
 756       for (row = 0; row < height; row++) {
 757          const GLvoid *source = _mesa_image_address(unpack,
 758                   pixels, width, height, format, type, 0, row, 0);
 759          _mesa_unpack_float_color_span(ctx, width, GL_RGBA, (void *) dest,
 760                                       format, type, source, unpack,
 761                                       transferOps & IMAGE_PRE_CONVOLUTION_BITS,
 762                                       GL_FALSE);
 763          dest += width * 4;
 764       }
 765
 766       /* do convolution */
 767       if (ctx->Pixel.Convolution2DEnabled) {
 768          _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 769       }
 770       else {
 771          ASSERT(ctx->Pixel.Separable2DEnabled);
 772          _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 773       }
 774       FREE(tmpImage);
 775
 776       /* continue transfer ops and draw the convolved image */
 777       unpack = &_mesa_native_packing;
 778       pixels = convImage;
 779       format = GL_RGBA;
 780       type = GL_FLOAT;
 781       transferOps &= IMAGE_POST_CONVOLUTION_BITS;
 782    }
 783
 784    /*
 785     * General solution
 786     */
 787    {
 788       GLchan rgba[MAX_WIDTH][4];
 789       GLint row;
 790       if (width > MAX_WIDTH)
 791          width = MAX_WIDTH;
 792       for (row = 0; row < height; row++, y++) {
 793          const GLvoid *source = _mesa_image_address(unpack,
 794                   pixels, width, height, format, type, 0, row, 0);
 795          _mesa_unpack_chan_color_span(ctx, width, GL_RGBA, (void*) rgba,
 796                                       format, type, source, unpack,
 797                                       transferOps);
 798          if ((ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink) ||
 799              (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink))
 800             continue;
 801
 802          if (ctx->Texture.ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
 803             GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
 804             GLchan primary_rgba[MAX_WIDTH][4];
 805             GLuint unit;
 806             /* XXX not sure how multitexture is supposed to work here */
 807
 808             MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
 809
 810             for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
 811                if (ctx->Texture.Unit[unit].ReallyEnabled) {
 812                   _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
 813                                     s, t, r, q);
 814                   gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
 815                                     primary_rgba, rgba);
 816                }
 817             }
 818          }
 819
 820          if (quickDraw) {
 821             (*ctx->Driver.WriteRGBASpan)( ctx, width, x, y,
 822                                           (CONST GLchan (*)[]) rgba, NULL);
 823          }
 824          else if (zoom) {
 825             gl_write_zoomed_rgba_span( ctx, width, x, y, zspan, 0,
 826                                        (CONST GLchan (*)[]) rgba, desty );
 827          }
 828          else {
 829             gl_write_rgba_span( ctx, (GLuint) width, x, y, zspan, 0,
 830                                 rgba, GL_BITMAP);
 831          }
 832       }
 833    }
 834
 835    if (convImage) {
 836       FREE(convImage);
 837    }
 838 }
 839
 840
 841
 842 /*
 843  * Execute glDrawPixels
 844  */
 845 void
 846 _swrast_DrawPixels( GLcontext *ctx,
 847                     GLint x, GLint y,
 848                     GLsizei width, GLsizei height,
 849                     GLenum format, GLenum type,
 850                     const struct gl_pixelstore_attrib *unpack,
 851                     const GLvoid *pixels )
 852 {
 853    (void) unpack;
 854
 855    switch (format) {
 856    case GL_STENCIL_INDEX:
 857       draw_stencil_pixels( ctx, x, y, width, height, type, pixels );
 858       break;
 859    case GL_DEPTH_COMPONENT:
 860       draw_depth_pixels( ctx, x, y, width, height, type, pixels );
 861       break;
 862    case GL_COLOR_INDEX:
 863       if (ctx->Visual.RGBAflag)
 864          draw_rgba_pixels(ctx, x,y, width, height, format, type, pixels);
 865       else
 866          draw_index_pixels(ctx, x, y, width, height, type, pixels);
 867       break;
 868    case GL_RED:
 869    case GL_GREEN:
 870    case GL_BLUE:
 871    case GL_ALPHA:
 872    case GL_LUMINANCE:
 873    case GL_LUMINANCE_ALPHA:
 874    case GL_RGB:
 875    case GL_BGR:
 876    case GL_RGBA:
 877    case GL_BGRA:
 878    case GL_ABGR_EXT:
 879       draw_rgba_pixels(ctx, x, y, width, height, format, type, pixels);
 880       break;
 881    default:
 882       gl_error( ctx, GL_INVALID_ENUM, "glDrawPixels(format)" );
 883    }
 884 }
 885