0a17b87286
Most tools used for compliance and SBOM generation use SPDX identifiers This change brings us a step closer to an easy SBOM generation. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
294 lines
7.7 KiB
C
294 lines
7.7 KiB
C
/****************************************************************************
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* graphics/nxglib/fb/nxglib_filltrapezoid.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/video/fb.h>
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#include <nuttx/nx/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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/* Make sure that this file is used in the proper context */
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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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* 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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* Description:
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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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(
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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_PIXEL_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 *dest;
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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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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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if (nrows > 1)
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{
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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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}
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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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x1 = (x1 + trap->bot.x1) >> 1;
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x2 = (x2 + trap->bot.x2) >> 1;
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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 (y1 < bounds->pt1.y)
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{
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/* Is the entire trapezoid "above" the clipping window? */
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if (y2 < 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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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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/* Is the entire trapezoid "below" the clipping window? */
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if (y1 > 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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/* 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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#ifdef CONFIG_NX_ANTIALIASING
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b16_t frac;
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#endif
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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 */
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ix1 = b16toi(x1);
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ix2 = b16toi(x2);
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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.
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* This clipped truncates "down" and gives the quantized pixel
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* holding the 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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/* Get the run length for the clipped row */
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width = ix2 - ix1 + 1;
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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 /* NXGLIB_BITSPERPIXEL < 8 */
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/* Then draw the run from (line + ix1) to (line + ix2) */
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dest = line + NXGL_SCALEX(ix1);
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#ifdef CONFIG_NX_ANTIALIASING
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/* Perform blending on the first pixel of the row */
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frac = b16ONE - b16frac(x1);
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NXGL_BLEND(dest, (NXGL_PIXEL_T)color, frac);
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dest += NXGL_SCALEX(1);
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width--;
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if (width > 0)
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{
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/* Copy pixels between the first and last pixel of the row. */
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if (width > 1)
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{
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NXGL_MEMSET(dest, (NXGL_PIXEL_T)color, width - 1);
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}
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/* And blend the final pixel */
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dest += NXGL_SCALEX(width - 1);
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frac = b16frac(x2);
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NXGL_BLEND(dest, (NXGL_PIXEL_T)color, frac);
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}
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#else /* CONFIG_NX_ANTIALIASING */
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NXGL_MEMSET(dest, (NXGL_PIXEL_T)color, width);
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#endif /* CONFIG_NX_ANTIALIASING */
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#endif /* NXGLIB_BITSPERPIXEL < 8 */
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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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