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/*

 * Mesa 3-D graphics library

 * Version:  7.1

 *

 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

/**

 * \file swrast/s_bitmap.c

 * \brief glBitmap rendering.

 * \author Brian Paul

 */

#include "main/glheader.h"

#include "main/bufferobj.h"

#include "main/condrender.h"

#include "main/image.h"

#include "main/macros.h"

#include "s_context.h"

#include "s_span.h"

/**

 * Render a bitmap.

 * Called via ctx->Driver.Bitmap()

 * All parameter error checking will have been done before this is called.

 */

void

_swrast_Bitmap( struct gl_context *ctx, GLint px, GLint py,

		GLsizei width, GLsizei height,

		const struct gl_pixelstore_attrib *unpack,

		const GLubyte *bitmap )

{

   GLint row, col;

   GLuint count = 0;

   SWspan span;

   ASSERT(ctx->RenderMode == GL_RENDER);

   if (!_mesa_check_conditional_render(ctx))

      return; /* don't draw */

   bitmap = (const GLubyte *) _mesa_map_pbo_source(ctx, unpack, bitmap);

   if (!bitmap)

      return;

   swrast_render_start(ctx);

   if (SWRAST_CONTEXT(ctx)->NewState)

      _swrast_validate_derived( ctx );

   INIT_SPAN(span, GL_BITMAP);

   span.end = width;

   span.arrayMask = SPAN_XY;

   _swrast_span_default_attribs(ctx, &span);

   for (row = 0; row < height; row++) {

      const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,

                 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);

      if (unpack->LsbFirst) {

         /* Lsb first */

         GLubyte mask = 1U << (unpack->SkipPixels & 0x7);

         for (col = 0; col < width; col++) {

            if (*src & mask) {

               span.array->x[count] = px + col;

               span.array->y[count] = py + row;

               count++;

            }

            if (mask == 128U) {

               src++;

               mask = 1U;

            }

            else {

               mask = mask << 1;

            }

         }

         /* get ready for next row */

         if (mask != 1)

            src++;

      }

      else {

         /* Msb first */

         GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);

         for (col = 0; col < width; col++) {

            if (*src & mask) {

               span.array->x[count] = px + col;

               span.array->y[count] = py + row;

               count++;

            }

            if (mask == 1U) {

               src++;

               mask = 128U;

            }

            else {

               mask = mask >> 1;

            }

         }

         /* get ready for next row */

         if (mask != 128)

            src++;

      }

      if (count + width >= MAX_WIDTH || row + 1 == height) {

         /* flush the span */

         span.end = count;

         _swrast_write_rgba_span(ctx, &span);

         span.end = 0;

         count = 0;

      }

   }

   swrast_render_finish(ctx);

   _mesa_unmap_pbo_source(ctx, unpack);

}

#if 0

/*

 * XXX this is another way to implement Bitmap.  Use horizontal runs of

 * fragments, initializing the mask array to indicate which fragments to

 * draw or skip.

 */

void

_swrast_Bitmap( struct gl_context *ctx, GLint px, GLint py,

		GLsizei width, GLsizei height,

		const struct gl_pixelstore_attrib *unpack,

		const GLubyte *bitmap )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   GLint row, col;

   SWspan span;

   ASSERT(ctx->RenderMode == GL_RENDER);

   ASSERT(bitmap);

   swrast_render_start(ctx);

   if (SWRAST_CONTEXT(ctx)->NewState)

      _swrast_validate_derived( ctx );

   INIT_SPAN(span, GL_BITMAP);

   span.end = width;

   span.arrayMask = SPAN_MASK;

   _swrast_span_default_attribs(ctx, &span);

   /*span.arrayMask |= SPAN_MASK;*/  /* we'll init span.mask[] */

   span.x = px;

   span.y = py;

   /*span.end = width;*/

   for (row=0; row

      const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,

                 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);

      if (unpack->LsbFirst) {

         /* Lsb first */

         GLubyte mask = 1U << (unpack->SkipPixels & 0x7);

         for (col=0; col

            span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;

            if (mask == 128U) {

               src++;

               mask = 1U;

            }

            else {

               mask = mask << 1;

            }

         }

         _swrast_write_rgba_span(ctx, &span);

         /* get ready for next row */

         if (mask != 1)

            src++;

      }

      else {

         /* Msb first */

         GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);

         for (col=0; col

            span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;

            if (mask == 1U) {

               src++;

               mask = 128U;

            }

            else {

               mask = mask >> 1;

            }

         }

         _swrast_write_rgba_span(ctx, &span);

         /* get ready for next row */

         if (mask != 128)

            src++;

      }

   }

   swrast_render_finish(ctx);

}

#endif