void NXGL_FUNCNAME(nxgl_filltrapezoid,NXGLIB_SUFFIX) (FAR struct lcd_planeinfo_s *pinfo, FAR const struct nxgl_trapezoid_s *trap, FAR const struct nxgl_rect_s *bounds, NXGL_PIXEL_T color) { unsigned int ncols; unsigned int topy; unsigned int boty; unsigned int row; unsigned int botw; b16_t topx1; b16_t topx2; b16_t botx1; b16_t botx2; b16_t dx1dy; b16_t dx2dy; int dy; int ix1; int ix2; /* Get the top run endpoints */ topx1 = trap->top.x1; topx2 = trap->top.x2; /* Calculate the number of rows to render */ topy = trap->top.y; boty = trap->bot.y; /* Get the bottom run endpoints */ botx1 = trap->bot.x1; botx2 = trap->bot.x2; /* Calculate the slope of the left and right side of the trapezoid */ dy = boty - topy; dx1dy = b16divi((botx1 - topx1), dy); dx2dy = b16divi((botx2 - topx2), dy); /* Perform vertical clipping */ if (topy < bounds->pt1.y) { /* Is the entire trapezoid "above" the clipping window? */ if (boty < bounds->pt1.y) { /* Yes.. then do nothing */ return; } /* Calculate the x values for the new top run */ dy = bounds->pt1.y - topy; topx1 += dy * dx1dy; topx2 += dy * dx2dy; /* Clip the top row to render */ topy = bounds->pt1.y; } if (boty > bounds->pt2.y) { /* Is the entire trapezoid "below" the clipping window? */ if (topy > bounds->pt2.y) { /* Yes.. then do nothing */ return; } /* Calculate the x values for the new bottom run */ dy = boty - bounds->pt2.y; botx1 -= dy * dx1dy; botx2 -= dy * dx2dy; /* Clip the bottom row to render */ boty = bounds->pt2.y; } /* Handle the special case where the sides cross (as in an hourglass) */ if (botx1 > botx2) { b16_t tmp; ngl_swap(botx1, botx2, tmp); } /* Fill the run buffer for the maximum run that we will need */ ix1 = b16toi(topx1); ix1 = ngl_clipl(ix1, bounds->pt1.x); ix2 = b16toi(topx2); ix2 = ngl_clipr(ix2, bounds->pt2.x); ncols = ix2 - ix1 + 1; ix1 = b16toi(botx1); ix1 = ngl_clipl(ix1, bounds->pt1.x); ix2 = b16toi(botx2); ix2 = ngl_clipr(ix2, bounds->pt2.x); botw = ix2 - ix1 + 1; if (ncols < botw) { ncols = botw; } NXGL_FUNCNAME(nxgl_fillrun,NXGLIB_SUFFIX)((NXGLIB_RUNTYPE*)pinfo->buffer, color, ncols); /* Then fill the trapezoid row-by-row */ for (row = topy; row <= boty; row++) { /* Handle the special case where the sides cross (as in an hourglass) */ if (topx1 > topx2) { b16_t tmp; ngl_swap(topx1, topx2, tmp); ngl_swap(dx1dy, dx2dy, tmp); } /* Convert the positions to integer and get the run width, clipping to * fit within the bounding box. */ ix1 = b16toi(topx1); ix1 = ngl_clipl(ix1, bounds->pt1.x); ix2 = b16toi(topx2); ix2 = ngl_clipr(ix2, bounds->pt2.x); /* Handle some corner cases where we draw nothing. Otherwise, we will * always draw at least one pixel. */ if (ix1 <= ix2) { /* Then draw the run from ix1 to ix2 at row */ ncols = ix2 - ix1 + 1; (void)pinfo->putrun(row, ix1, pinfo->buffer, ncols); } /* Add the dx/dy value to get the run positions on the next row */ topx1 += dx1dy; topx2 += dx2dy; } }
void NXGL_FUNCNAME(nxgl_filltrapezoid,NXGLIB_SUFFIX)( FAR struct fb_planeinfo_s *pinfo, FAR const struct nxgl_trapezoid_s *trap, FAR const struct nxgl_rect_s *bounds, NXGL_PIXEL_T color) { unsigned int stride; unsigned int width; FAR uint8_t *dest; FAR uint8_t *line; int nrows; b16_t x1; b16_t x2; nxgl_coord_t y1; nxgl_coord_t y2; b16_t dx1dy; b16_t dx2dy; #if NXGLIB_BITSPERPIXEL < 8 uint8_t mpixel = NXGL_MULTIPIXEL(color); uint8_t mask; int lnlen; #endif /* 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; /* Calculate the number of rows to render */ y1 = trap->top.y; y2 = trap->bot.y; nrows = y2 - y1 + 1; /* Calculate the slope of the left and right side of the trapezoid */ if (nrows > 1) { dx1dy = b16divi((trap->bot.x1 - x1), nrows - 1); dx2dy = b16divi((trap->bot.x2 - x2), nrows - 1); } else { /* The trapezoid is a run! Use the average width. */ x1 = (x1 + trap->bot.x1) >> 1; x2 = (x2 + trap->bot.x2) >> 1; dx1dy = 0; dx2dy = 0; } /* Perform vertical clipping */ if (y1 < bounds->pt1.y) { /* Is the entire trapezoid "above" the clipping window? */ if (y2 < bounds->pt1.y) { /* Yes.. then do nothing */ return; } /* Calculate the x values for the new top run */ int dy = bounds->pt1.y - y1; x1 += dy * dx1dy; x2 += dy * dx2dy; /* Clip and re-calculate the number of rows to render */ y1 = bounds->pt1.y; nrows = y2 - y1 + 1; } if (y2 > bounds->pt2.y) { /* Is the entire trapezoid "below" the clipping window? */ if (y1 > bounds->pt2.y) { /* Yes.. then do nothing */ return; } /* Clip and re-calculate the number of rows to render */ y2 = bounds->pt2.y; nrows = y2 - y1 + 1; } /* Get the address of the first byte on the first line */ line = pinfo->fbmem + y1 * stride ; /* 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 >= bounds->pt1.x && ix1 <= bounds->pt2.x) { /* Get a clipped copies of the starting and ending X positions. This * clipped truncates "down" and gives the quantized pixel holding the * fractional X position */ ix1 = ngl_clipl(ix1, bounds->pt1.x); ix2 = ngl_clipr(ix2, bounds->pt2.x); /* Get the run length for the clipped row */ width = ix2 - ix1 + 1; #if NXGLIB_BITSPERPIXEL < 8 /* Handle masking of the fractional initial byte */ #ifdef CONFIG_NX_PACKEDMSFIRST mask = (uint8_t)(0xff >> (8 - NXGL_REMAINDERX(ix1)); #else mask = (uint8_t)(0xff << (8 - NXGL_REMAINDERX(ix1))); #endif dest = line; lnlen = width; if (lnlen > 1 && mask) { dest[0] = (dest[0] & ~mask) | (mpixel & mask); mask = 0xff; dest++; lnlen--; } /* Handle masking of the fractional final byte */ #ifdef CONFIG_NX_PACKEDMSFIRST mask &= (uint8_t)(0xff << (8 - NXGL_REMAINDERX(ix2))); #else mask &= (uint8_t)(0xff >> (8 - NXGL_REMAINDERX(ix2))); #endif if (lnlen > 0 && mask) { dest[lnlen-1] = (dest[lnlen-1] & ~mask) | (mpixel & mask); lnlen--; } /* Handle all of the unmasked bytes in-between */ if (lnlen > 0) { NXGL_MEMSET(dest, (NXGL_PIXEL_T)color, lnlen); } #else /* Then draw the run from (line + ix1) to (line + ix2) */ dest = line + NXGL_SCALEX(ix1); NXGL_MEMSET(dest, (NXGL_PIXEL_T)color, width); #endif } /* 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; }