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Add nxgl_splitline()

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3835 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2011-08-02 01:12:16 +00:00
parent a203a142f3
commit 8216275fad
5 changed files with 391 additions and 5 deletions
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3
ChangeLog
View File

@ -1960,5 +1960,6 @@
controller.
* graphics/nxglib/lcd and fb: Add low level routines to set single pixels.
* lib/math/lib_b16atan2.c: Add a fixed precision atan2() function
* graphics/nxglib/nxglib_splitline.c: Add logic to divide a wide line into
trapezoidal components.

24
configs/stm3210e-eval/src/up_lcd.c
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@ -33,6 +33,14 @@
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************/
/* This driver supports the following LCDs:
*
* 1. Ampire AM-240320LTNQW00H
* 2. Orise Tech SPFD5408B
* 3. RenesasSP R61580
*
* The driver dynamically selects the LCD based on the reported LCD ID value.
*/
/**************************************************************************************
* Included Files
@ -259,6 +267,11 @@
#define LCD_BL_TIMER_PERIOD 8999
/* LCD IDs */
#define SPFD5408B_ID 0x5408
#define R61580_ID 0x1580
/* Debug ******************************************************************************/
#ifdef CONFIG_DEBUG_LCD
@ -848,9 +861,16 @@ static int stm3210e_setcontrast(struct lcd_dev_s *dev, unsigned int contrast)
static inline void stm3210e_lcdinitialize(void)
{
/* Check if the LCD is SPFD5408B Controller */
uint16_t id;
if (stm3210e_readreg(LCD_REG_0) == 0x5408)
/* Check if the LCD is Orise Tech SPFD5408B Controller (or the compatible RenesasSP
* R61580).
*/
id = stm3210e_readreg(LCD_REG_0);
lcddbg("ID: %04x\n", id);
if (id == SPFD5408B_ID || id == R61580_ID)
{
g_lcddev.spfd5408b = true;

2
graphics/nxglib/Make.defs
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@ -77,7 +77,7 @@ COLOR_CSRCS = nxglib_colorcopy.c
LCD_CSRCS =
NXGLIB_CSRCS = nxglib_rgb2yuv.c nxglib_yuv2rgb.c \
NXGLIB_CSRCS = nxglib_rgb2yuv.c nxglib_yuv2rgb.c nxglib_splitline.c \
$(SETP1_CSRCS) $(SETP2_CSRCS) $(RFILL1_CSRCS) $(RFILL2_CSRCS) \
$(TFILL1_CSRCS) $(TFILL2_CSRCS) $(RMOVE1_CSRCS) $(RMOVE2_CSRCS) \
$(RCOPY1_CSRCS) $(RCOPY2_CSRCS) $(RECT_CSRCS) $(TRAP_CSRCS) \

314
graphics/nxglib/nxglib_splitline.c Normal file
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@ -0,0 +1,314 @@
/****************************************************************************
* graphics/nxglib/nxsglib_splitline.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <string.h>
#include <errno.h>
#include <nuttx/nx/nxglib.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxgl_splitline
*
* Description:
* In the general case, a line with width can be represented as a
* parallelogram with a triangle at the top and bottom. Triangles and
* parallelograms are both degenerate versions of a trapeziod. This
* function breaks. This function also detects other degenerate cases:
*
* 1. If y1 == y2 then the line is horizontal and is better represented
* as a rectangle.
* 2. If x1 == x2 then the line is vertical and also better represented
* as a rectangle.
* 3. If the width of the line is 1, then there are no triangles at the
* top and bottome (this may also be the case if the width is narrow
* and the line is near vertical)
* 4. If the line is oriented is certain angles, it may consist only of
* the upper and lower triangles with no trapezoid inbetween. In
* this case, 3 trapezoids will be returned, but traps[1] will be
* degenerate.
*
* Input parameters:
* vector - A pointer to the vector described the line to be drawn.
* traps - A pointer to a array of trapezoids (size 3).
* rect - A pointer to a rectangle.
*
* Returned value:
* 0: Line successfully broken up into three trapezoids. Values in
* traps[0], traps[1], and traps[2] are valid.
* 1: Line successfully represented by one trapezoid. Value in traps[1]
* is valid.
* 2: Line successfully represented by one rectangle. Value in rect is
* valid
* <0: On errors, a negated errno value is returned.
*
****************************************************************************/
int nxgl_splitline(FAR struct nxgl_vector_s *vector,
FAR struct nxgl_trapezoid_s *traps,
FAR struct nxgl_rect_s *rect,
nxgl_coord_t linewidth)
{
struct nxgl_vector_s line;
struct nxgl_point_s pt;
nxgl_coord_t iheight;
nxgl_coord_t iwidth;
nxgl_coord_t triheight;
nxgl_coord_t adjwidth;
nxgl_coord_t xoffset;
nxgl_coord_t halfoffset;
nxgl_coord_t halfheight;
b16_t angle;
/* First, check the linewidth */
if (linewidth < 1)
{
return -EINVAL;
}
/* Then make sure that the start position of the line is above the end
* position of the line... in raster order.
*/
if (vector->pt1.y < vector->pt2.y)
{
/* Vector is already in raster order */
memcpy(&line, vector, sizeof(struct nxgl_vector_s));
}
else if (vector->pt1.y > vector->pt2.y)
{
/* Swap the top and bottom */
line.pt1.x = vector->pt2.x;
line.pt1.y = vector->pt2.y;
line.pt2.x = vector->pt1.x;
line.pt2.y = vector->pt1.y;
}
else
{
/* First degenerate case: The line is horizontal. */
if (vector->pt1.x < vector->pt2.x)
{
rect->pt1.x = vector->pt1.x;
rect->pt2.x = vector->pt2.x;
}
else
{
rect->pt1.x = vector->pt2.x;
rect->pt2.x = vector->pt1.x;
}
/* The height of the rectangle is the width of the line, half above
* and half below.
*/
rect->pt1.y = vector->pt1.y - (linewidth >> 1);
rect->pt2.y = rect->pt1.y + linewidth - 1;
return 2;
}
/* Check if the line is vertical */
if (line.pt1.x == line.pt2.x)
{
/* Second degenerate case: The line is vertical. */
rect->pt1.y = line.pt1.y;
rect->pt2.y = line.pt2.y;
rect->pt1.x = line.pt1.x - (linewidth >> 1);
rect->pt2.x = rect->pt1.x + linewidth - 1;
return 2;
}
/* The final degenerate case */
if (linewidth == 1)
{
/* A line of width 1 is basically a single parallelogram of width 1 */
traps[1].top.x1 = line.pt1.x;
traps[1].top.x2 = line.pt1.x;
traps[1].top.y = line.pt1.y;
traps[1].bot.x1 = line.pt2.x;
traps[1].bot.x2 = line.pt2.x;
traps[1].bot.y = line.pt2.y;
return 1;
}
/* Okay, then what remains is interesting.
*
* iheight = |y2 - y1|
* iwidth = |x2 - x1|
*/
iheight = line.pt2.y - line.pt1.y + 1;
if (line.pt1.x < line.pt2.x)
{
iwidth = line.pt2.x - line.pt1.x + 1;
}
else
{
iwidth = line.pt1.x - line.pt2.x + 1;
}
/*
* Triangle height: linewidth * cosA
* Adjusted width: triheight / sinA
* X offset : linewidth * linewidth / adjusted line width
*/
angle = b16atan2(itob16(iheight), itob16(iwidth));
triheight = b16toi(linewidth * b16cos(angle));
adjwidth = b16toi(b16divb16(itob16(linewidth), b16sin(angle)));
xoffset = (linewidth * linewidth + (adjwidth >> 1)) / adjwidth;
halfoffset = (xoffset >> 1);
halfheight = (triheight >> 1);
/* Return the top triangle (if there is one) */
if (triheight > 0)
{
if (line.pt1.x < line.pt2.x)
{
/* Line is going "south east" */
pt.x = line.pt1.x - halfoffset;
pt.y = line.pt1.y + halfheight;
traps[0].top.x1 = pt.x + xoffset;
traps[0].top.x2 = traps[0].top.x1;
traps[0].top.y = pt.y - triheight + 1;
traps[0].bot.x1 = pt.x;
traps[0].bot.x2 = pt.x + adjwidth - 1;
traps[0].bot.y = pt.y;
pt.x = line.pt2.x + halfoffset;
pt.y = line.pt2.y - halfheight;
traps[2].top.x1 = pt.x - adjwidth + 1;
traps[2].top.x2 = pt.x;
traps[2].top.y = pt.y;
traps[2].bot.x1 = pt.x - xoffset;
traps[2].bot.x2 = traps[2].bot.x1;
traps[2].bot.y = pt.y + triheight - 1;
}
else
{
/* Line is going "south west" */
pt.x = line.pt1.x + halfoffset;
pt.y = line.pt1.y + halfheight;
traps[0].top.x1 = pt.x - xoffset;
traps[0].top.x2 = traps[0].top.x1;
traps[0].top.y = pt.y - triheight + 1;
traps[0].bot.x1 = pt.x - adjwidth + 1;
traps[0].bot.x2 = pt.x;
traps[0].bot.y = pt.y;
pt.x = line.pt2.x - halfoffset;
pt.y = line.pt2.y - halfheight;
traps[2].top.x1 = pt.x;
traps[2].top.x2 = pt.x + adjwidth - 1;
traps[2].top.y = pt.y;
traps[2].bot.x1 = pt.x + xoffset;
traps[2].bot.x2 = traps[2].bot.x1;
traps[2].bot.y = pt.y + triheight - 1;
}
/* The center parallelogram is the horizontal edge of each triangle.
* Note the minor inefficency: that horizontal edge is drawn twice.
*/
traps[1].top.x1 = traps[0].bot.x1;
traps[1].top.x2 = traps[0].bot.x2;
traps[1].top.y = traps[0].bot.y;
traps[1].bot.x1 = traps[2].top.x1;
traps[1].bot.x2 = traps[2].top.x2;
traps[1].bot.y = traps[2].top.y;
return 0;
}
/* The line is too vertical to have any significant triangular top or
* bottom. Just return the center parallelogram.
*/
traps[1].top.x1 = line.pt1.x - halfoffset;
traps[1].top.x2 = traps[1].top.x1 + adjwidth - 1;
traps[1].top.y = line.pt1.y;
traps[1].bot.x1 = line.pt2.x - halfoffset;
traps[1].bot.x2 = traps[1].bot.x1 + adjwidth - 1;
traps[1].bot.y = line.pt2.y;
return 1;
}

51
include/nuttx/nx/nxglib.h
View File

@ -146,6 +146,14 @@ struct nxgl_rect_s
struct nxgl_point_s pt2; /* Lower, right-hand corner */
};
/* Describes a vector starting at pt1 and extending throug pt2 */
struct nxgl_vector_s
{
struct nxgl_point_s pt1; /* Start position */
struct nxgl_point_s pt2; /* End position */
};
/* Describes a run, i.e., a horizontal line. Note that the start/end positions
* have fractional precision. This is necessary for good joining of trapezoids
* when a more complex shape is decomposed into trapezoids
@ -579,6 +587,49 @@ EXTERN void nxgl_trapcopy(FAR struct nxgl_trapezoid_s *dest,
EXTERN void nxgl_colorcopy(nxgl_mxpixel_t dest[CONFIG_NX_NPLANES],
const nxgl_mxpixel_t src[CONFIG_NX_NPLANES]);
/****************************************************************************
* Name: nxgl_splitline
*
* Description:
* In the general case, a line with width can be represented as a
* parallelogram with a triangle at the top and bottom. Triangles and
* parallelograms are both degenerate versions of a trapeziod. This
* function breaks. This function also detects other degenerate cases:
*
* 1. If y1 == y2 then the line is horizontal and is better represented
* as a rectangle.
* 2. If x1 == x2 then the line is vertical and also better represented
* as a rectangle.
* 3. If the width of the line is 1, then there are no triangles at the
* top and bottome (this may also be the case if the width is narrow
* and the line is near vertical)
* 4. If the line is oriented is certain angles, it may consist only of
* the upper and lower triangles with no trapezoid inbetween. In
* this case, 3 trapezoids will be returned, but traps[1] will be
* degenerate.
*
* Input parameters:
* vector - A pointer to the vector described the line to be drawn.
* traps - A pointer to a array of trapezoids (size 3).
* rect - A pointer to a rectangle.
*
* Returned value:
* 0: Line successfully broken up into three trapezoids. Values in
* traps[0], traps[1], and traps[2] are valid.
* 1: Line successfully represented by one trapezoid. Value in traps[1]
* is valid.
* 2: Line successfully represented by one rectangle. Value in rect is
* valid
* <0: On errors, a negated errno value is returned.
*
****************************************************************************/
EXTERN int nxgl_splitline(FAR struct nxgl_vector_s *vector,
FAR struct nxgl_trapezoid_s *traps,
FAR struct nxgl_rect_s *rect,
nxgl_coord_t linewidth);
#undef EXTERN
#if defined(__cplusplus)
}