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px4_autopilot/nuttx/graphics/nxglib/nxglib_copyrun.h

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/****************************************************************************
* graphics/nxglib/nxsglib_copyrun.h
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
*
****************************************************************************/
#ifndef __GRAPHICS_NXGLIB_NXGLIB_COPYRUN_H
#define __GRAPHICS_NXGLIB_NXGLIB_COPYRUN_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxgl_copyrun_*bpp
*
* Description:
* Copy a row from an image into run.
*
****************************************************************************/
#if NXGLIB_BITSPERPIXEL == 1
static inline void
nxgl_copyrun_1bpp(FAR const uint8_t *src, FAR uint8_t *dest,
unsigned int remainder, size_t npixels)
{
uint8_t indata;
uint8_t outdata;
uint8_t nextdata;
unsigned int outpixels = 0;
DEBUGASSERT(remainder > 0 && remainder < 8);
/* Take only the first 8-remainder pixels from the first byte.
* remainder is number between 1 and 7 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
indata = *src++;
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-(remainder-1)
* are carried over to the first pass through the loop. For
* example if remainder == 2:
*
* indata: xxAA AAAA maps to nextdata: AAAA AAxx
*/
nextdata = (indata << remainder);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits (7-remainder)-7
* are carried over to the first pass through the loop. For example
* if remainder == 2:
*
* indata: AAAA AAxx maps to nextdata: xxAA AAAA
*/
nextdata = (indata >> remainder);
#endif
/* Loop until all pixels have been packed into the destination. Note:
* a outpixels increments by 8 so a few extra pixels will be packed on
* the output. This should not be an issue.
*/
while (outpixels < npixels)
{
/* Get the next byte from the source */
indata = *src++;
outdata = nextdata;
/* remainder is number between 1 and 7 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits (7-remainder)-7
* are carried over from that last pass through the loop. For
* example if remainder == 2:
*
* nextdata = AAAA AAxx - dest = AAAA AABB
* src = BBCC CCCC - nextdata = CCCC CCxx
*/
outdata |= (indata >> (8 - remainder));
nextdata = (indata << remainder);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(remainder-1)
* are carried over from that last pass through the loop . For
* example if remainder == 2:
*
* nextdata = xxAA AAAA - dest = BBAA AAAA
* src = CCCC CCBB - nextdata = xxCC CCCC
*/
outdata |= (indata << (8 - remainder));
nextdata = (indata >> remainder);
#endif
/* Transfer the byte to the run buffer */
*dest++ = outdata;
outpixels += 8;
}
}
#elif NXGLIB_BITSPERPIXEL == 2
static inline void
nxgl_copyrun_2bpp(FAR const uint8_t *src, FAR uint8_t *dest,
unsigned int remainder, size_t npixels)
{
uint8_t indata;
uint8_t outdata;
uint8_t nextdata;
unsigned int outpixels = 0;
unsigned int shift;
DEBUGASSERT(remainder > 0 && remainder < 4);
/* Take only the first 8-(2*remainder) pixels from the first byte.
* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
indata = *src++;
shift = (remainder << 1);
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-(2*remainder-1)
* are carried over to the first pass through the loop. For
* example if remainder == 1:
*
* indata: xxAA AAAA maps to nextdata: AAAA AAxx
*/
nextdata = (indata << shift);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits (7-2*remainder)-7
* are carried over to the first pass through the loop. For example
* if remainder == 1:
*
* indata: AAAA AAxx maps to nextdata: xxAA AAAA
*/
nextdata = (indata >> shift);
#endif
/* Loop until all pixels have been packed into the destination. Note:
* a outpixels increments by 8 so a few extra pixels will be packed on
* the output. This should not be an issue.
*/
while (outpixels < npixels)
{
/* Get the next byte from the source */
indata = *src++;
outdata = nextdata;
/* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits (7-2*remainder)-7
* are carried over from that last pass through the loop. For example
* if remainder == 1:
*
* nextdata = AAAA AAxx - dest = AAAA AABB
* src = BBCC CCCC - nextdata = CCCC CCxx
*/
outdata |= (indata >> (8 - shift));
nextdata = (indata << shift);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(2*remainder-1)
* are carried over from that last pass through the loop. For example
* if remainder == 1:
*
* nextdata = xxAA AAAA - dest = BBAA AAAA
* src = CCCC CCBB - nextdata = xxCC CCCC
*/
outdata |= (indata << (8 - shift));
nextdata = (indata >> shift);
#endif
/* Transfer the byte to the run buffer */
*dest++ = outdata;
outpixels += 4;
}
}
#elif NXGLIB_BITSPERPIXEL == 4
static inline void
nxgl_copyrun_4bpp(FAR const uint8_t *src, FAR uint8_t *dest,
unsigned int remainder, size_t npixels)
{
uint8_t indata;
uint8_t outdata;
uint8_t nextdata;
unsigned int outpixels = 0;
DEBUGASSERT(remainder == 1);
/* Take only the first 8-remainder pixels from the first byte.
* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
indata = *src++;
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-3
* are carried over to the first pass through the loop. For
* example:
*
* indata: xxxx AAAA maps to nextdata: AAAA xxxx
*/
nextdata = (indata << 4);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 4-7
* are carried over to the first pass through the loop. For example:
*
* indata: AAAA xxxx maps to nextdata: xxxx AAAA
*/
nextdata = (indata >> 4);
#endif
/* Loop until all pixels have been packed into the destination. Note:
* a outpixels increments by 8 so a few extra pixels will be packed on
* the output. This should not be an issue.
*/
while (outpixels < npixels)
{
/* Get the next byte from the source */
indata = *src++;
outdata = nextdata;
/* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 4-7
* are carried over from that last pass through the loop (or are
* ignored initially. For example if remainder == 1:
*
* nextdata = AAAA xxxx - dest = AAAA BBBB
* src = BBBB CCCC - nextdata = CCCC xxxx
*/
outdata |= (indata >> 4);
nextdata = (indata << 4);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(remainder-1)
* are carried over from that last pass through the loop (or are
* ignored initially). For example if remainder == 2:
*
* nextdata = xxAA AAAA - dest = BBAA AAAA
* src = CCCC CCBB - nextdata = xxCC CCCC
*/
outdata |= (indata << 4);
nextdata = (indata >> 4);
#endif
/* Transfer the byte to the run buffer */
*dest++ = outdata;
outpixels += 2;
}
}
#endif
#endif /* __GRAPHICS_NXGLIB_NXGLIB_COPYRUN_H */