src/mesa/swrast/s_drawpix.c

   1 /* $Id: s_drawpix.c,v 1.26 2002/01/27 18:32:03 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   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 "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_context.h"
  39 #include "s_drawpix.h"
  40 #include "s_fog.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  * Given the dest position, size and skipPixels and skipRows values
  51  * for a glDrawPixels command, perform clipping of the image bounds
  52  * so the result lies withing the context's buffer bounds.
  53  * Return:  GL_TRUE if image is ready for drawing
  54  *          GL_FALSE if image was completely clipped away (draw nothing)
  55  */
  56 GLboolean
  57 _mesa_clip_pixelrect(const GLcontext *ctx,
  58                      GLint *destX, GLint *destY,
  59                      GLsizei *width, GLsizei *height,
  60                      GLint *skipPixels, GLint *skipRows)
  61 {
  62    const GLframebuffer *buffer = ctx->DrawBuffer;
  63
  64    /* left clipping */
  65    if (*destX < buffer->_Xmin) {
  66       *skipPixels += (buffer->_Xmin - *destX);
  67       *width -= (buffer->_Xmin - *destX);
  68       *destX = buffer->_Xmin;
  69    }
  70    /* right clipping */
  71    if (*destX + *width > buffer->_Xmax)
  72       *width -= (*destX + *width - buffer->_Xmax);
  73
  74    if (*width <= 0)
  75       return GL_FALSE;
  76
  77    /* bottom clipping */
  78    if (*destY < buffer->_Ymin) {
  79       *skipRows += (buffer->_Ymin - *destY);
  80       *height -= (buffer->_Ymin - *destY);
  81       *destY = buffer->_Ymin;
  82    }
  83    /* top clipping */
  84    if (*destY + *height > buffer->_Ymax)
  85       *height -= (*destY + *height - buffer->_Ymax);
  86
  87    if (*height <= 0)
  88       return GL_TRUE;
  89
  90    return GL_TRUE;
  91 }
  92
  93
  94
  95 /*
  96  * Try to do a fast and simple RGB(a) glDrawPixels.
  97  * Return:  GL_TRUE if success, GL_FALSE if slow path must be used instead
  98  */
  99 static GLboolean
 100 fast_draw_pixels(GLcontext *ctx, GLint x, GLint y,
 101                  GLsizei width, GLsizei height,
 102                  GLenum format, GLenum type, const GLvoid *pixels)
 103 {
 104    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 105    const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
 106    GLchan rgb[MAX_WIDTH][3];
 107    GLchan rgba[MAX_WIDTH][4];
 108
 109    if (!ctx->Current.RasterPosValid) {
 110       return GL_TRUE;      /* no-op */
 111    }
 112
 113    if ((SWRAST_CONTEXT(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 _mesa_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->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 = IROUND(ctx->Current.RasterPos[1]);
 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.rgbMode) {
 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                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 216                                               (CONST GLchan (*)[4]) 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                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 227                                               (CONST GLchan (*)[4]) src, NULL);
 228                   src += rowLength * 4;
 229                }
 230             }
 231             else {
 232                /* with zooming */
 233                GLint row;
 234                for (row=0; row<drawHeight; row++) {
 235                   _mesa_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
 236                                   zSpan, 0, (CONST GLchan (*)[4]) 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.rgbMode) {
 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                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 253                                               (CONST GLchan (*)[3]) 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                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 264                                               (CONST GLchan (*)[3]) src, NULL);
 265                   src += rowLength * 3;
 266                }
 267             }
 268             else {
 269                /* with zooming */
 270                GLint row;
 271                for (row=0; row<drawHeight; row++) {
 272                   _mesa_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
 273                                   zSpan, 0, (CONST GLchan (*)[3]) 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.rgbMode) {
 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                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 298                                               (CONST GLchan (*)[3]) 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                   (*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
 316                                               (CONST GLchan (*)[3]) 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                   _mesa_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
 332                                   zSpan, 0, (CONST GLchan (*)[3]) 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.rgbMode) {
 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                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 359                                              (CONST GLchan (*)[4]) 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                   (*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
 379                                              (CONST GLchan (*)[4]) 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                   _mesa_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
 397                                  zSpan, 0, (CONST GLchan (*)[4]) 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.rgbMode) {
 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                   (*swrast->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                   (*swrast->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                   _mesa_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
 444                                  zSpan, 0, (CONST GLchan (*)[4]) 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                   (*swrast->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 = (width > MAX_WIDTH) ? MAX_WIDTH : width;
 493    struct sw_span span;
 494
 495    INIT_SPAN(span);
 496    span.arrayMask |= SPAN_INDEX;
 497
 498    if (ctx->Depth.Test)
 499       _mesa_span_default_z(ctx, &span);
 500    if (ctx->Fog.Enabled)
 501       _mesa_span_default_fog(ctx, &span);
 502
 503    /*
 504     * General solution
 505     */
 506    for (row = 0; row < height; row++, y++) {
 507       const GLvoid *source = _mesa_image_address(&ctx->Unpack,
 508                     pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0);
 509       _mesa_unpack_index_span(ctx, drawWidth, GL_UNSIGNED_INT,
 510                               span.color.index,
 511                               type, source, &ctx->Unpack,
 512                               ctx->_ImageTransferState);
 513       if (zoom) {
 514          _mesa_write_zoomed_index_span(ctx, drawWidth, x, y,
 515                                        span.zArray, span.fogArray,
 516                                        span.color.index, desty);
 517       }
 518       else {
 519          span.x = x;
 520          span.y = y;
 521          span.end = drawWidth;
 522          _mesa_write_index_span(ctx, &span, GL_BITMAP);
 523       }
 524    }
 525 }
 526
 527
 528
 529 /*
 530  * Do glDrawPixels of stencil image.  The image datatype may either
 531  * be GLubyte or GLbitmap.
 532  */
 533 static void
 534 draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
 535                      GLsizei width, GLsizei height,
 536                      GLenum type, const GLvoid *pixels )
 537 {
 538    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 539    const GLint desty = y;
 540    GLint row, drawWidth;
 541
 542    if (type != GL_BYTE &&
 543        type != GL_UNSIGNED_BYTE &&
 544        type != GL_SHORT &&
 545        type != GL_UNSIGNED_SHORT &&
 546        type != GL_INT &&
 547        type != GL_UNSIGNED_INT &&
 548        type != GL_FLOAT &&
 549        type != GL_BITMAP) {
 550       _mesa_error( ctx, GL_INVALID_ENUM, "glDrawPixels(stencil type)");
 551       return;
 552    }
 553
 554    if (ctx->Visual.stencilBits == 0) {
 555       _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawPixels(no stencil buffer)");
 556       return;
 557    }
 558
 559    drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
 560
 561    for (row = 0; row < height; row++, y++) {
 562       GLstencil values[MAX_WIDTH];
 563       GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
 564                       ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 565       const GLvoid *source = _mesa_image_address(&ctx->Unpack,
 566                     pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0);
 567       _mesa_unpack_index_span(ctx, drawWidth, destType, values,
 568                               type, source, &ctx->Unpack,
 569                               ctx->_ImageTransferState);
 570       if (ctx->_ImageTransferState & IMAGE_SHIFT_OFFSET_BIT) {
 571          _mesa_shift_and_offset_stencil( ctx, drawWidth, values );
 572       }
 573       if (ctx->Pixel.MapStencilFlag) {
 574          _mesa_map_stencil( ctx, drawWidth, values );
 575       }
 576
 577       if (zoom) {
 578          _mesa_write_zoomed_stencil_span( ctx, (GLuint) drawWidth, x, y,
 579                                        values, desty );
 580       }
 581       else {
 582          _mesa_write_stencil_span( ctx, (GLuint) drawWidth, x, y, values );
 583       }
 584    }
 585 }
 586
 587
 588 /*
 589  * Do a glDrawPixels of depth values.
 590  */
 591 static void
 592 draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
 593                    GLsizei width, GLsizei height,
 594                    GLenum type, const GLvoid *pixels )
 595 {
 596    const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
 597    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 598    const GLint desty = y;
 599    GLint drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
 600    struct sw_span span;
 601
 602    INIT_SPAN(span);
 603    span.arrayMask |= SPAN_Z;
 604    span.end = drawWidth;
 605
 606    if (type != GL_BYTE
 607        && type != GL_UNSIGNED_BYTE
 608        && type != GL_SHORT
 609        && type != GL_UNSIGNED_SHORT
 610        && type != GL_INT
 611        && type != GL_UNSIGNED_INT
 612        && type != GL_FLOAT) {
 613       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)");
 614       return;
 615    }
 616
 617    _mesa_span_default_color(ctx, &span);
 618
 619    if (ctx->Fog.Enabled)
 620       _mesa_span_default_fog(ctx, &span);
 621
 622    if (type==GL_UNSIGNED_SHORT && sizeof(GLdepth)==sizeof(GLushort)
 623        && !bias_or_scale && !zoom && ctx->Visual.rgbMode) {
 624       /* Special case: directly write 16-bit depth values */
 625       GLint row;
 626       for (row = 0; row < height; row++, y++) {
 627          const GLushort *zptr = (const GLushort *)
 628             _mesa_image_address(&ctx->Unpack, pixels, width, height,
 629                                 GL_DEPTH_COMPONENT, type, 0, row, 0);
 630          GLint i;
 631          for (i = 0; i < drawWidth; i++)
 632             span.zArray[i] = zptr[i];
 633
 634          span.x = x;
 635          span.y = y;
 636          span.end = drawWidth;
 637          span.filledDepth = GL_TRUE;  /* XXX temporary */
 638          _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
 639       }
 640    }
 641    else if (type==GL_UNSIGNED_INT && ctx->Visual.depthBits == 32
 642        && !bias_or_scale && !zoom && ctx->Visual.rgbMode) {
 643       /* Special case: directly write 32-bit depth values */
 644       GLint row;
 645       for (row = 0; row < height; row++, y++) {
 646          const GLuint *zptr = (const GLuint *)
 647             _mesa_image_address(&ctx->Unpack, pixels, width, height,
 648                                 GL_DEPTH_COMPONENT, type, 0, row, 0);
 649
 650          /* XXX get rid of this loop.  use zArray pointer in span */
 651          GLint i;
 652          for (i = 0; i < drawWidth; i++)
 653             span.zArray[i] = zptr[i];
 654          span.x = x;
 655          span.y = y;
 656          span.end = drawWidth;
 657          _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
 658       }
 659    }
 660    else {
 661       /* General case */
 662       GLint row;
 663       for (row = 0; row < height; row++, y++) {
 664          GLfloat fspan[MAX_WIDTH];
 665          const GLvoid *src = _mesa_image_address(&ctx->Unpack,
 666                 pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
 667          _mesa_unpack_depth_span( ctx, drawWidth, fspan, type, src,
 668                                   &ctx->Unpack );
 669          /* clamp depth values to [0,1] and convert from floats to integers */
 670          {
 671             const GLfloat zs = ctx->DepthMaxF;
 672             GLint i;
 673             for (i = 0; i < drawWidth; i++) {
 674                span.zArray[i] = (GLdepth) (fspan[i] * zs);
 675             }
 676          }
 677
 678          if (ctx->Visual.rgbMode) {
 679             if (zoom) {
 680                _mesa_write_zoomed_rgba_span(ctx, width, x, y, span.zArray, 0,
 681                                 (const GLchan (*)[4]) span.color.rgba, desty);
 682             }
 683             else {
 684                span.x = x;
 685                span.y = y;
 686                span.end = drawWidth;
 687                _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
 688             }
 689          }
 690          else {
 691             if (zoom) {
 692                _mesa_write_zoomed_index_span(ctx, drawWidth, x, y,
 693                                              span.zArray, 0,
 694                                              span.color.index, GL_BITMAP);
 695             }
 696             else {
 697                span.x = x;
 698                span.y = y;
 699                span.end = drawWidth;
 700                _mesa_write_index_span(ctx, &span, GL_BITMAP);
 701             }
 702          }
 703       }
 704    }
 705 }
 706
 707
 708 /*
 709  * Do glDrawPixels of RGBA pixels.
 710  */
 711 static void
 712 draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
 713                   GLsizei width, GLsizei height,
 714                   GLenum format, GLenum type, const GLvoid *pixels )
 715 {
 716    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 717    const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
 718    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 719    const GLint desty = y;
 720    GLboolean quickDraw;
 721    GLfloat *convImage = NULL;
 722    GLuint transferOps = ctx->_ImageTransferState;
 723    struct sw_span span;
 724
 725    INIT_SPAN(span);
 726    span.arrayMask |= SPAN_RGBA;
 727
 728    if (!_mesa_is_legal_format_and_type(format, type)) {
 729       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(format or type)");
 730       return;
 731    }
 732
 733    /* Try an optimized glDrawPixels first */
 734    if (fast_draw_pixels(ctx, x, y, width, height, format, type, pixels))
 735       return;
 736
 737    /* Fragment depth values */
 738    if (ctx->Depth.Test || ctx->Fog.Enabled) {
 739       /* fill in array of z values */
 740       GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->DepthMaxF);
 741       GLfloat fog;
 742       GLint i;
 743
 744       if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
 745          fog = _mesa_z_to_fogfactor(ctx, ctx->Current.RasterFogCoord);
 746       else
 747          fog = _mesa_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
 748
 749       for (i=0;i<width;i++) {
 750          span.zArray[i] = z;
 751          span.fogArray[i] = fog;
 752       }
 753    }
 754
 755    if (ctx->Fog.Enabled)
 756       _mesa_span_default_fog(ctx, &span);
 757    span.arrayMask |= SPAN_Z;
 758
 759    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0 && !zoom && x >= 0 && y >= 0
 760        && x + width <= ctx->DrawBuffer->Width
 761        && y + height <= ctx->DrawBuffer->Height) {
 762       quickDraw = GL_TRUE;
 763    }
 764    else {
 765       quickDraw = GL_FALSE;
 766    }
 767
 768    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 769       /* Convolution has to be handled specially.  We'll create an
 770        * intermediate image, applying all pixel transfer operations
 771        * up to convolution.  Then we'll convolve the image.  Then
 772        * we'll proceed with the rest of the transfer operations and
 773        * rasterize the image.
 774        */
 775       GLint row;
 776       GLfloat *dest, *tmpImage;
 777
 778       tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 779       if (!tmpImage) {
 780          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 781          return;
 782       }
 783       convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
 784       if (!convImage) {
 785          FREE(tmpImage);
 786          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 787          return;
 788       }
 789
 790       /* Unpack the image and apply transfer ops up to convolution */
 791       dest = tmpImage;
 792       for (row = 0; row < height; row++) {
 793          const GLvoid *source = _mesa_image_address(unpack,
 794                   pixels, width, height, format, type, 0, row, 0);
 795          _mesa_unpack_float_color_span(ctx, width, GL_RGBA, (GLfloat *) dest,
 796                                       format, type, source, unpack,
 797                                       transferOps & IMAGE_PRE_CONVOLUTION_BITS,
 798                                       GL_FALSE);
 799          dest += width * 4;
 800       }
 801
 802       /* do convolution */
 803       if (ctx->Pixel.Convolution2DEnabled) {
 804          _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 805       }
 806       else {
 807          ASSERT(ctx->Pixel.Separable2DEnabled);
 808          _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 809       }
 810       FREE(tmpImage);
 811
 812       /* continue transfer ops and draw the convolved image */
 813       unpack = &_mesa_native_packing;
 814       pixels = convImage;
 815       format = GL_RGBA;
 816       type = GL_FLOAT;
 817       transferOps &= IMAGE_POST_CONVOLUTION_BITS;
 818    }
 819
 820    /*
 821     * General solution
 822     */
 823    {
 824       GLint row;
 825       if (width > MAX_WIDTH)
 826          width = MAX_WIDTH;
 827       for (row = 0; row < height; row++, y++) {
 828          const GLvoid *source = _mesa_image_address(unpack,
 829                   pixels, width, height, format, type, 0, row, 0);
 830          /*         printf("Unpack f=0x%x t=0x%x\n", format, type);*/
 831          _mesa_unpack_chan_color_span(ctx, width, GL_RGBA,
 832                                       (GLchan *) span.color.rgba,
 833                                       format, type, source, unpack,
 834                                       transferOps);
 835          if (0){
 836             int k;
 837             for (k = 0; k < width; k++)
 838                printf("%02x ", span.color.rgba[k][3]);
 839             printf("\n");
 840          }
 841
 842          if ((ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink) ||
 843              (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink))
 844             continue;
 845
 846          if (ctx->Pixel.PixelTextureEnabled && ctx->Texture._ReallyEnabled) {
 847             span.end = width;
 848             _swrast_pixel_texture(ctx, &span);
 849          }
 850
 851          if (quickDraw) {
 852             (*swrast->Driver.WriteRGBASpan)(ctx, width, x, y,
 853                                  (CONST GLchan (*)[4]) span.color.rgba, NULL);
 854          }
 855          else if (zoom) {
 856             _mesa_write_zoomed_rgba_span(ctx, width, x, y, span.zArray,
 857                                 span.fogArray,
 858                                 (CONST GLchan (*)[4]) span.color.rgba, desty);
 859          }
 860          else {
 861             span.x = x;
 862             span.y = y;
 863             span.end = width;
 864             _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
 865          }
 866       }
 867    }
 868
 869    if (convImage) {
 870       FREE(convImage);
 871    }
 872 }
 873
 874
 875
 876 /*
 877  * Execute glDrawPixels
 878  */
 879 void
 880 _swrast_DrawPixels( GLcontext *ctx,
 881                     GLint x, GLint y,
 882                     GLsizei width, GLsizei height,
 883                     GLenum format, GLenum type,
 884                     const struct gl_pixelstore_attrib *unpack,
 885                     const GLvoid *pixels )
 886 {
 887    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 888    (void) unpack;
 889
 890
 891    if (swrast->NewState)
 892       _swrast_validate_derived( ctx );
 893
 894    RENDER_START(swrast,ctx);
 895    switch (format) {
 896    case GL_STENCIL_INDEX:
 897       draw_stencil_pixels( ctx, x, y, width, height, type, pixels );
 898       break;
 899    case GL_DEPTH_COMPONENT:
 900       draw_depth_pixels( ctx, x, y, width, height, type, pixels );
 901       break;
 902    case GL_COLOR_INDEX:
 903       if (ctx->Visual.rgbMode)
 904          draw_rgba_pixels(ctx, x,y, width, height, format, type, pixels);
 905       else
 906          draw_index_pixels(ctx, x, y, width, height, type, pixels);
 907       break;
 908    case GL_RED:
 909    case GL_GREEN:
 910    case GL_BLUE:
 911    case GL_ALPHA:
 912    case GL_LUMINANCE:
 913    case GL_LUMINANCE_ALPHA:
 914    case GL_RGB:
 915    case GL_BGR:
 916    case GL_RGBA:
 917    case GL_BGRA:
 918    case GL_ABGR_EXT:
 919       draw_rgba_pixels(ctx, x, y, width, height, format, type, pixels);
 920       break;
 921    default:
 922       _mesa_error( ctx, GL_INVALID_ENUM, "glDrawPixels(format)" );
 923    }
 924
 925    RENDER_FINISH(swrast,ctx);
 926 }