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/****************************************************************************
* graphics/nxglib/nxglib_filltrapezoid.c
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <fixedmath.h>
#include <nuttx/fb.h>
#include <nuttx/nxglib.h>
#include "nxglib_bitblit.h"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
#ifndef NXGLIB_SUFFIX
# error "NXGLIB_SUFFIX must be defined before including this header file"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxglib_filltrapezoid_*bpp
*
* Descripton:
* Fill a trapezoidal region in the framebuffer memory with a fixed color.
* This is useful for drawing complex shape -- (most) complex shapes can be
* broken into a set of trapezoids.
*
****************************************************************************/
void NXGL_FUNCNAME(nxglib_filltrapezoid,NXGLIB_SUFFIX)
(FAR struct fb_videoinfo_s *vinfo, FAR struct fb_planeinfo_s *pinfo,
FAR const struct nxgl_trapezoid_s *trap, nxgl_mxpixel_t color)
{
unsigned int stride;
ubyte *line;
int nrows;
b16_t x1;
b16_t x2;
b16_t dx1dy;
b16_t dx2dy;
/* Get the width of the framebuffer in bytes */
stride = pinfo->stride;
/* Get the top run position and the number of rows to draw */
x1 = trap->top.x1;
x2 = trap->top.x2;
nrows = trap->bot.y - trap->top.y + 1;
/* Get the address of the first byte on the first line */
line = pinfo->fbmem + trap->top.y * stride ;
/* Calculate the slope of the left and right side of the trapezoid */
dx1dy = b16divi((trap->bot.x1 - x1), nrows);
dx2dy = b16divi((trap->bot.x2 - x2), nrows);
/* Then fill the trapezoid line-by-line */
while (nrows--)
{
int ix1;
int ix2;
/* Handle the special case where the sides cross (as in an hourglass) */
if (x1 > x2)
{
b16_t tmp;
ngl_swap(x1, x2, tmp);
ngl_swap(dx1dy, dx2dy, tmp);
}
/* Convert the positions to integer */
ix1 = b16toi(x1);
ix2 = b16toi(x2);
/* Handle some corner cases where we draw nothing. Otherwise, we will
* always draw at least one pixel.
*/
if (x1 > x2 || ix2 < 0 || ix1 > vinfo->yres)
{
/* Get a clipped copies of the startingand ending X positions. This
* clipped truncates "down" and gives the quantized pixel holding the
* fractional X position
*/
ix1 = ngl_clipl(ix1, 0);
ix2 = ngl_clipr(ix2, vinfo->yres);
/* Then draw the run from (line + clipx1) to (line + clipx2) */
NXGL_MEMSET(line + NXGL_SCALEX(ix1), (NXGL_PIXEL_T)color, ix2 - ix1 + 1);
}
/* Move to the start of the next line */
line += stride;
/* Add the dx/dy value to get the run positions on the next row */
x1 += dx1dy;
x2 += dx2dy;
}
}
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