From 555e551c46f5c9dbd74f92239c0078a6feb65568 Mon Sep 17 00:00:00 2001 From: patacongo Date: Wed, 26 Nov 2008 22:20:00 +0000 Subject: Add more rasterizers git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1316 42af7a65-404d-4744-a932-0658087f49c3 --- nuttx/graphics/nxglib/nxglib_filltrapezoid.c | 167 +++++++++++++++++++++++++++ 1 file changed, 167 insertions(+) create mode 100644 nuttx/graphics/nxglib/nxglib_filltrapezoid.c (limited to 'nuttx/graphics/nxglib/nxglib_filltrapezoid.c') diff --git a/nuttx/graphics/nxglib/nxglib_filltrapezoid.c b/nuttx/graphics/nxglib/nxglib_filltrapezoid.c new file mode 100644 index 000000000..f1f13a00f --- /dev/null +++ b/nuttx/graphics/nxglib/nxglib_filltrapezoid.c @@ -0,0 +1,167 @@ +/**************************************************************************** + * graphics/nxglib/nxglib_filltrapezoid.c + * + * Copyright (C) 2008 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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 + +#include +#include +#include +#include + +#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_PIXEL_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), 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; + } +} -- cgit v1.2.3