252 lines
7.6 KiB
C
252 lines
7.6 KiB
C
/****************************************************************************
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* graphics/nxglib/fb/nxglib_filltrapezoid.c
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*
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* Copyright (C) 2008-2010 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <fixedmath.h>
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#include <nuttx/fb.h>
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#include <nuttx/nxglib.h>
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#include "nxglib_bitblit.h"
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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#ifndef NXGLIB_SUFFIX
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# error "NXGLIB_SUFFIX must be defined before including this header file"
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxglib_filltrapezoid_*bpp
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*
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* Descripton:
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* Fill a trapezoidal region in the framebuffer memory with a fixed color.
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* Clip the trapezoid to lie within a boundng box. This is useful for
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* drawing complex shapes that can be broken into a set of trapezoids.
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*
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****************************************************************************/
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void NXGL_FUNCNAME(nxgl_filltrapezoid,NXGLIB_SUFFIX)(
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FAR struct fb_planeinfo_s *pinfo,
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FAR const struct nxgl_trapezoid_s *trap,
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FAR const struct nxgl_rect_s *bounds,
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nxgl_mxpixel_t color)
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{
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unsigned int stride;
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unsigned int width;
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FAR uint8_t *line;
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int nrows;
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b16_t x1;
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b16_t x2;
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nxgl_coord_t y1;
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nxgl_coord_t y2;
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b16_t dx1dy;
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b16_t dx2dy;
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#if NXGLIB_BITSPERPIXEL < 8
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FAR uint8_t *dest;
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uint8_t mpixel = NXGL_MULTIPIXEL(color);
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uint8_t mask;
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int lnlen;
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#endif
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/* Get the width of the framebuffer in bytes */
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stride = pinfo->stride;
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/* Get the top run position and the number of rows to draw */
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x1 = trap->top.x1;
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x2 = trap->top.x2;
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/* Calculate the number of rows to render */
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y1 = trap->top.y;
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y2 = trap->bot.y;
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nrows = y2 - y1 + 1;
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/* Calculate the slope of the left and right side of the trapezoid */
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dx1dy = b16divi((trap->bot.x1 - x1), nrows - 1);
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dx2dy = b16divi((trap->bot.x2 - x2), nrows - 1);
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/* Perform vertical clipping */
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if (y1 < bounds->pt1.y)
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{
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/* Calculate the x values for the new top run */
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int dy = bounds->pt1.y - y1;
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x1 += dy * dx1dy;
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x2 += dy * dx2dy;
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/* Clip and re-calculate the number of rows to render */
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y1 = bounds->pt1.y;
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nrows = y2 - y1 + 1;
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}
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if (y2 > bounds->pt2.y)
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{
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/* Clip and re-calculate the number of rows to render */
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y2 = bounds->pt2.y;
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nrows = y2 - y1 + 1;
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}
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/* Get the address of the first byte on the first line */
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line = pinfo->fbmem + y1 * stride ;
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/* Then fill the trapezoid line-by-line */
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while (nrows--)
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{
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int ix1;
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int ix2;
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/* Handle the special case where the sides cross (as in an hourglass) */
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if (x1 > x2)
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{
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b16_t tmp;
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ngl_swap(x1, x2, tmp);
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ngl_swap(dx1dy, dx2dy, tmp);
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}
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/* Convert the positions to integer and get the run width */
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ix1 = b16toi(x1);
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ix2 = b16toi(x2);
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width = ix2 - ix1 + 1;
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/* Handle some corner cases where we draw nothing. Otherwise, we will
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* always draw at least one pixel.
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*/
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if (x1 > x2 || ix2 < bounds->pt1.x || ix1 > bounds->pt2.x)
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{
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/* Get a clipped copies of the starting and ending X positions. This
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* clipped truncates "down" and gives the quantized pixel holding the
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* fractional X position
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*/
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ix1 = ngl_clipl(ix1, bounds->pt1.x);
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ix2 = ngl_clipr(ix2, bounds->pt2.x);
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#if NXGLIB_BITSPERPIXEL < 8
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/* Handle masking of the fractional initial byte */
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#ifdef CONFIG_NX_PACKEDMSFIRST
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mask = (uint8_t)(0xff >> (8 - NXGL_REMAINDERX(ix1));
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#else
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mask = (uint8_t)(0xff << (8 - NXGL_REMAINDERX(ix1)));
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#endif
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dest = line;
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lnlen = width;
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if (lnlen > 1 && mask)
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{
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dest[0] = (dest[0] & ~mask) | (mpixel & mask);
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mask = 0xff;
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dest++;
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lnlen--;
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}
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/* Handle masking of the fractional final byte */
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#ifdef CONFIG_NX_PACKEDMSFIRST
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mask &= (uint8_t)(0xff << (8 - NXGL_REMAINDERX(ix2)));
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#else
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mask &= (uint8_t)(0xff >> (8 - NXGL_REMAINDERX(ix2)));
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#endif
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if (lnlen > 0 && mask)
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{
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dest[lnlen-1] = (dest[lnlen-1] & ~mask) | (mpixel & mask);
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lnlen--;
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}
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/* Handle all of the unmasked bytes in-between */
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if (lnlen > 0)
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{
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NXGL_MEMSET(dest, (NXGL_PIXEL_T)color, lnlen);
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}
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#else
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/* Then draw the run from (line + ix1) to (line + ix2) */
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NXGL_MEMSET(line + NXGL_SCALEX(ix1), (NXGL_PIXEL_T)color, width);
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#endif
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}
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/* Move to the start of the next line */
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line += stride;
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/* Add the dx/dy value to get the run positions on the next row */
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x1 += dx1dy;
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x2 += dx2dy;
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}
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}
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