src/mesa/swrast/s_bitmap.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file swrast/s_bitmap.c
  27  * \brief glBitmap rendering.
  28  * \author Brian Paul
  29  */
  30
  31 #include "glheader.h"
  32 #include "image.h"
  33 #include "macros.h"
  34 #include "pixel.h"
  35
  36 #include "s_context.h"
  37 #include "s_span.h"
  38
  39
  40
  41 /*
  42  * Render a bitmap.
  43  */
  44 void
  45 _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
  46                 GLsizei width, GLsizei height,
  47                 const struct gl_pixelstore_attrib *unpack,
  48                 const GLubyte *bitmap )
  49 {
  50    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  51    GLint row, col;
  52    GLuint count = 0;
  53    struct sw_span span;
  54
  55    ASSERT(ctx->RenderMode == GL_RENDER);
  56
  57    bitmap = _swrast_validate_pbo_access(unpack, width, height, 1,
  58                                         GL_COLOR_INDEX, GL_BITMAP,
  59                                         (GLvoid *) bitmap);
  60    if (!bitmap) {
  61       /* XXX GL_INVALID_OPERATION? */
  62       return;
  63    }
  64
  65    RENDER_START(swrast,ctx);
  66
  67    if (SWRAST_CONTEXT(ctx)->NewState)
  68       _swrast_validate_derived( ctx );
  69
  70    INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_XY);
  71
  72    if (ctx->Visual.rgbMode) {
  73       span.interpMask |= SPAN_RGBA;
  74       span.red   = FloatToFixed(ctx->Current.RasterColor[0] * CHAN_MAXF);
  75       span.green = FloatToFixed(ctx->Current.RasterColor[1] * CHAN_MAXF);
  76       span.blue  = FloatToFixed(ctx->Current.RasterColor[2] * CHAN_MAXF);
  77       span.alpha = FloatToFixed(ctx->Current.RasterColor[3] * CHAN_MAXF);
  78       span.redStep = span.greenStep = span.blueStep = span.alphaStep = 0;
  79    }
  80    else {
  81       span.interpMask |= SPAN_INDEX;
  82       span.index = FloatToFixed(ctx->Current.RasterIndex);
  83       span.indexStep = 0;
  84    }
  85
  86    if (ctx->Depth.Test)
  87       _swrast_span_default_z(ctx, &span);
  88    if (ctx->Fog.Enabled)
  89       _swrast_span_default_fog(ctx, &span);
  90    if (ctx->Texture._EnabledCoordUnits)
  91       _swrast_span_default_texcoords(ctx, &span);
  92
  93    for (row = 0; row < height; row++, span.y++) {
  94       const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
  95                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
  96
  97       if (unpack->LsbFirst) {
  98          /* Lsb first */
  99          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 100          for (col = 0; col < width; col++) {
 101             if (*src & mask) {
 102                span.array->x[count] = px + col;
 103                span.array->y[count] = py + row;
 104                count++;
 105             }
 106             if (mask == 128U) {
 107                src++;
 108                mask = 1U;
 109             }
 110             else {
 111                mask = mask << 1;
 112             }
 113          }
 114
 115          /* get ready for next row */
 116          if (mask != 1)
 117             src++;
 118       }
 119       else {
 120          /* Msb first */
 121          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 122          for (col = 0; col < width; col++) {
 123             if (*src & mask) {
 124                span.array->x[count] = px + col;
 125                span.array->y[count] = py + row;
 126                count++;
 127             }
 128             if (mask == 1U) {
 129                src++;
 130                mask = 128U;
 131             }
 132             else {
 133                mask = mask >> 1;
 134             }
 135          }
 136
 137          /* get ready for next row */
 138          if (mask != 128)
 139             src++;
 140       }
 141
 142       if (count + width >= MAX_WIDTH || row + 1 == height) {
 143          /* flush the span */
 144          span.end = count;
 145          if (ctx->Visual.rgbMode)
 146             _swrast_write_rgba_span(ctx, &span);
 147          else
 148             _swrast_write_index_span(ctx, &span);
 149          span.end = 0;
 150          count = 0;
 151       }
 152    }
 153
 154    RENDER_FINISH(swrast,ctx);
 155 }
 156
 157
 158 #if 0
 159 /*
 160  * XXX this is another way to implement Bitmap.  Use horizontal runs of
 161  * fragments, initializing the mask array to indicate which fragmens to
 162  * draw or skip.
 163  */
 164 void
 165 _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
 166                 GLsizei width, GLsizei height,
 167                 const struct gl_pixelstore_attrib *unpack,
 168                 const GLubyte *bitmap )
 169 {
 170    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 171    GLint row, col;
 172    struct sw_span span;
 173
 174    ASSERT(ctx->RenderMode == GL_RENDER);
 175    ASSERT(bitmap);
 176
 177    RENDER_START(swrast,ctx);
 178
 179    if (SWRAST_CONTEXT(ctx)->NewState)
 180       _swrast_validate_derived( ctx );
 181
 182    INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_MASK);
 183
 184    /*span.arrayMask |= SPAN_MASK;*/  /* we'll init span.mask[] */
 185    span.x = px;
 186    span.y = py;
 187    /*span.end = width;*/
 188    if (ctx->Visual.rgbMode) {
 189       span.interpMask |= SPAN_RGBA;
 190       span.red   = FloatToFixed(ctx->Current.RasterColor[0] * CHAN_MAXF);
 191       span.green = FloatToFixed(ctx->Current.RasterColor[1] * CHAN_MAXF);
 192       span.blue  = FloatToFixed(ctx->Current.RasterColor[2] * CHAN_MAXF);
 193       span.alpha = FloatToFixed(ctx->Current.RasterColor[3] * CHAN_MAXF);
 194       span.redStep = span.greenStep = span.blueStep = span.alphaStep = 0;
 195    }
 196    else {
 197       span.interpMask |= SPAN_INDEX;
 198       span.index = FloatToFixed(ctx->Current.RasterIndex);
 199       span.indexStep = 0;
 200    }
 201
 202    if (ctx->Depth.Test)
 203       _swrast_span_default_z(ctx, &span);
 204    if (ctx->Fog.Enabled)
 205       _swrast_span_default_fog(ctx, &span);
 206    if (ctx->Texture._EnabledCoordUnits)
 207       _swrast_span_default_texcoords(ctx, &span);
 208
 209    for (row=0; row<height; row++, span.y++) {
 210       const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
 211                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
 212
 213       if (unpack->LsbFirst) {
 214          /* Lsb first */
 215          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 216          for (col=0; col<width; col++) {
 217             span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
 218             if (mask == 128U) {
 219                src++;
 220                mask = 1U;
 221             }
 222             else {
 223                mask = mask << 1;
 224             }
 225          }
 226
 227          if (ctx->Visual.rgbMode)
 228             _swrast_write_rgba_span(ctx, &span);
 229          else
 230             _swrast_write_index_span(ctx, &span);
 231
 232          /* get ready for next row */
 233          if (mask != 1)
 234             src++;
 235       }
 236       else {
 237          /* Msb first */
 238          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 239          for (col=0; col<width; col++) {
 240             span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
 241             if (mask == 1U) {
 242                src++;
 243                mask = 128U;
 244             }
 245             else {
 246                mask = mask >> 1;
 247             }
 248          }
 249
 250          if (ctx->Visual.rgbMode)
 251             _swrast_write_rgba_span(ctx, &span);
 252          else
 253             _swrast_write_index_span(ctx, &span);
 254
 255          /* get ready for next row */
 256          if (mask != 128)
 257             src++;
 258       }
 259    }
 260
 261    RENDER_FINISH(swrast,ctx);
 262 }
 263 #endif