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259 lines
7.5 KiB
259 lines
7.5 KiB
/**************************************************************************** |
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* graphics/nxglib/lcd/nxglib_filltrapezoid.c |
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* |
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* Copyright (C) 2010-2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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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/lcd/lcd.h> |
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#include <nuttx/nx/nxglib.h> |
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#include "nxglib_bitblit.h" |
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#include "nxglib_fillrun.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 LCD 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 lcd_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_PIXEL_T color) |
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{ |
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unsigned int ncols; |
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unsigned int topy; |
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unsigned int boty; |
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unsigned int row; |
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unsigned int botw; |
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b16_t topx1; |
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b16_t topx2; |
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b16_t botx1; |
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b16_t botx2; |
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b16_t dx1dy; |
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b16_t dx2dy; |
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int dy; |
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int ix1; |
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int ix2; |
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/* Get the top run endpoints */ |
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topx1 = trap->top.x1; |
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topx2 = trap->top.x2; |
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/* Calculate the number of rows to render */ |
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topy = trap->top.y; |
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boty = trap->bot.y; |
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/* Get the bottom run endpoints */ |
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botx1 = trap->bot.x1; |
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botx2 = trap->bot.x2; |
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/* Calculate the slope of the left and right side of the trapezoid */ |
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dy = boty - topy; |
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if (dy > 0) |
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{ |
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dx1dy = b16divi((botx1 - topx1), dy); |
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dx2dy = b16divi((botx2 - topx2), dy); |
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} |
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else |
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{ |
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/* The trapezoid is a run! Use the average width. */ |
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topx1 = (topx1 + botx1) >> 1; |
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topx2 = (topx2 + botx2) >> 1; |
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botx1 = topx1; |
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botx2 = topx2; |
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dx1dy = 0; |
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dx2dy = 0; |
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} |
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/* Perform vertical clipping */ |
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if (topy < bounds->pt1.y) |
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{ |
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/* Is the entire trapezoid "above" the clipping window? */ |
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if (boty < bounds->pt1.y) |
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{ |
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/* Yes.. then do nothing */ |
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return; |
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} |
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/* Calculate the x values for the new top run */ |
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dy = bounds->pt1.y - topy; |
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topx1 += dy * dx1dy; |
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topx2 += dy * dx2dy; |
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/* Clip the top row to render */ |
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topy = bounds->pt1.y; |
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} |
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if (boty > bounds->pt2.y) |
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{ |
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/* Is the entire trapezoid "below" the clipping window? */ |
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if (topy > bounds->pt2.y) |
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{ |
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/* Yes.. then do nothing */ |
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return; |
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} |
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/* Calculate the x values for the new bottom run */ |
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dy = boty - bounds->pt2.y; |
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botx1 -= dy * dx1dy; |
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botx2 -= dy * dx2dy; |
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/* Clip the bottom row to render */ |
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boty = bounds->pt2.y; |
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} |
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/* Handle the special case where the sides cross (as in an hourglass) */ |
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if (botx1 > botx2) |
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{ |
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b16_t tmp; |
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ngl_swap(botx1, botx2, tmp); |
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} |
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/* Fill the run buffer for the maximum run that we will need */ |
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ix1 = b16toi(topx1); |
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ix1 = ngl_clipl(ix1, bounds->pt1.x); |
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ix2 = b16toi(topx2); |
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ix2 = ngl_clipr(ix2, bounds->pt2.x); |
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ncols = ix2 - ix1 + 1; |
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ix1 = b16toi(botx1); |
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ix1 = ngl_clipl(ix1, bounds->pt1.x); |
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ix2 = b16toi(botx2); |
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ix2 = ngl_clipr(ix2, bounds->pt2.x); |
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botw = ix2 - ix1 + 1; |
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if (ncols < botw) |
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{ |
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ncols = botw; |
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} |
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NXGL_FUNCNAME(nxgl_fillrun,NXGLIB_SUFFIX)((NXGLIB_RUNTYPE*)pinfo->buffer, color, ncols); |
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/* Then fill the trapezoid row-by-row */ |
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for (row = topy; row <= boty; row++) |
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{ |
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/* Handle the special case where the sides cross (as in an hourglass) */ |
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if (topx1 > topx2) |
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{ |
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b16_t tmp; |
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ngl_swap(topx1, topx2, 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, clipping to |
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* fit within the bounding box. |
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*/ |
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ix1 = b16toi(topx1); |
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ix1 = ngl_clipl(ix1, bounds->pt1.x); |
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ix2 = b16toi(topx2); |
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ix2 = ngl_clipr(ix2, bounds->pt2.x); |
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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 (ix1 <= ix2) |
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{ |
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/* Then draw the run from ix1 to ix2 at row */ |
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ncols = ix2 - ix1 + 1; |
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(void)pinfo->putrun(row, ix1, pinfo->buffer, ncols); |
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} |
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/* Add the dx/dy value to get the run positions on the next row */ |
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topx1 += dx1dy; |
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topx2 += dx2dy; |
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} |
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}
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