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Fill trapezoid for LCD

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2606 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2010-04-17 18:08:39 +00:00
parent 816cb81e95
commit 58c075fc9c
1 changed files with 87 additions and 110 deletions
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graphics/nxglib/lcd/nxglib_filltrapezoid.c
+87 -110
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@@ -46,6 +46,7 @@
#include <nuttx/nxglib.h>
#include "nxglib_bitblit.h"
#include "nxglib_fillrun.h"
/****************************************************************************
* Pre-Processor Definitions
@@ -91,161 +92,137 @@ void NXGL_FUNCNAME(nxgl_filltrapezoid,NXGLIB_SUFFIX)(
FAR const struct nxgl_rect_s *bounds,
nxgl_mxpixel_t color)
{
unsigned int stride;
unsigned int width;
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;
unsigned int ncols;
unsigned int dy;
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 ix1;
int ix2;
#if NXGLIB_BITSPERPIXEL < 8
FAR uint8_t *dest;
uint8_t mpixel = NXGL_MULTIPIXEL(color);
uint8_t mask;
int lnlen;
#endif
/* Get the top run endpoints */
/* 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;
topx1 = trap->top.x1;
topx2 = trap->top.x2;
/* Calculate the number of rows to render */
y1 = trap->top.y;
y2 = trap->bot.y;
nrows = y2 - y1 + 1;
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 */
dx1dy = b16divi((trap->bot.x1 - x1), nrows - 1);
dx2dy = b16divi((trap->bot.x2 - x2), nrows - 1);
dy = boty - topy;
dx1dy = b16divi((botx1 - topx1), dy);
dx2dy = b16divi((botx2 - topx2), dy);
/* Perform vertical clipping */
if (y1 < bounds->pt1.y)
if (topy < bounds->pt1.y)
{
/* Calculate the x values for the new top run */
int dy = bounds->pt1.y - y1;
x1 += dy * dx1dy;
x2 += dy * dx2dy;
dy = bounds->pt1.y - topy;
topx1 += dy * dx1dy;
topx2 += dy * dx2dy;
/* Clip and re-calculate the number of rows to render */
/* Clip the top row to render */
y1 = bounds->pt1.y;
nrows = y2 - y1 + 1;
topy = bounds->pt1.y;
}
if (y2 > bounds->pt2.y)
if (boty > bounds->pt2.y)
{
/* Clip and re-calculate the number of rows to render */
/* Calculate the x values for the new bottom run */
y2 = bounds->pt2.y;
nrows = y2 - y1 + 1;
dy = boty - bounds->pt2.y;
botx1 -= dy * dx1dy;
botx2 -= dy * dx2dy;
/* Clip the bottom row to render */
boty = bounds->pt2.y;
}
/* Get the address of the first byte on the first line */
/* Break out now if it was completely clipped */
line = pinfo->fbmem + y1 * stride ;
if (topy > boty)
{
return;
}
/* 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 = ngl_clipl(b16toi(topx1), bounds->pt1.x);
ix2 = ngl_clipl(b16toi(topx2), bounds->pt2.x);
ncols = ix2 - ix1 + 1;
ix1 = ngl_clipl(b16toi(botx1), bounds->pt1.x);
ix2 = ngl_clipl(b16toi(botx2), 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 line-by-line */
while (nrows--)
for (row = topy; row <= boty; row++)
{
int ix1;
int ix2;
/* Handle the special case where the sides cross (as in an hourglass) */
if (x1 > x2)
if (topx1 > topx2)
{
b16_t tmp;
ngl_swap(x1, x2, tmp);
ngl_swap(topx1, topx2, tmp);
ngl_swap(dx1dy, dx2dy, tmp);
}
/* Convert the positions to integer and get the run width */
/* Convert the positions to integer and get the run width,
* clipping to fit within the bounding box.
*/
ix1 = b16toi(x1);
ix2 = b16toi(x2);
width = ix2 - ix1 + 1;
ix1 = ngl_clipl(b16toi(topx1), bounds->pt1.x);
ix2 = ngl_clipl(b16toi(topx2), bounds->pt2.x);
/* 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)
if (ix1 <= ix2)
{
/* 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
*/
/* Then draw the run from ix1 to ix2 at row */
ix1 = ngl_clipl(ix1, bounds->pt1.x);
ix2 = ngl_clipr(ix2, bounds->pt2.x);
#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) */
NXGL_MEMSET(line + NXGL_SCALEX(ix1), (NXGL_PIXEL_T)color, width);
#endif
ncols = ix2 - ix1 + 1;
(void)pinfo->putrun(row, ix1, pinfo->buffer, ncols);
}
/* 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;
topx1 += dx1dy;
topx2 += dx2dy;
}
}