325 lines
9.9 KiB
C
325 lines
9.9 KiB
C
/****************************************************************************
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* graphics/nxglib/nxglib_copyrun.h
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*
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* Copyright (C) 2010 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __GRAPHICS_NXGLIB_NXGLIB_COPYRUN_H
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#define __GRAPHICS_NXGLIB_NXGLIB_COPYRUN_H
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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 <string.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxgl_copyrun_*bpp
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*
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* Description:
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* Copy a row from an image into run.
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*
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****************************************************************************/
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#if NXGLIB_BITSPERPIXEL == 1
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static inline void
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nxgl_copyrun_1bpp(FAR const uint8_t *src, FAR uint8_t *dest,
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unsigned int remainder, size_t npixels)
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{
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uint8_t indata;
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uint8_t outdata;
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uint8_t nextdata;
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unsigned int outpixels = 0;
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DEBUGASSERT(remainder > 0 && remainder < 8);
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/* Take only the first 8-remainder pixels from the first byte.
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* remainder is number between 1 and 7 (not zero!) that represents
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* the alignment of the pixel bits in the source.
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*/
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indata = *src++;
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#ifdef CONFIG_NX_PACKEDMSFIRST
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/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-(remainder-1)
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* are carried over to the first pass through the loop. For
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* example if remainder == 2:
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*
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* indata: xxAA AAAA maps to nextdata: AAAA AAxx
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*/
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nextdata = (indata << remainder);
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#else
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/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits (7-remainder)-7
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* are carried over to the first pass through the loop. For example
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* if remainder == 2:
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*
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* indata: AAAA AAxx maps to nextdata: xxAA AAAA
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*/
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nextdata = (indata >> remainder);
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#endif
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/* Loop until all pixels have been packed into the destination. Note:
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* a outpixels increments by 8 so a few extra pixels will be packed on
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* the output. This should not be an issue.
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*/
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while (outpixels < npixels)
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{
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/* Get the next byte from the source */
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indata = *src++;
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outdata = nextdata;
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/* remainder is number between 1 and 7 (not zero!) that represents
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* the alignment of the pixel bits in the source.
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*/
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#ifdef CONFIG_NX_PACKEDMSFIRST
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/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits (7-remainder)-7
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* are carried over from that last pass through the loop. For
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* example if remainder == 2:
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*
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* nextdata = AAAA AAxx - dest = AAAA AABB
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* src = BBCC CCCC - nextdata = CCCC CCxx
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*/
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outdata |= (indata >> (8 - remainder));
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nextdata = (indata << remainder);
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#else
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/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(remainder-1)
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* are carried over from that last pass through the loop . For
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* example if remainder == 2:
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*
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* nextdata = xxAA AAAA - dest = BBAA AAAA
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* src = CCCC CCBB - nextdata = xxCC CCCC
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*/
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outdata |= (indata << (8 - remainder));
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nextdata = (indata >> remainder);
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#endif
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/* Transfer the byte to the run buffer */
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*dest++ = outdata;
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outpixels += 8;
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}
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}
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#elif NXGLIB_BITSPERPIXEL == 2
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static inline void
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nxgl_copyrun_2bpp(FAR const uint8_t *src, FAR uint8_t *dest,
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unsigned int remainder, size_t npixels)
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{
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uint8_t indata;
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uint8_t outdata;
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uint8_t nextdata;
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unsigned int outpixels = 0;
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unsigned int shift;
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DEBUGASSERT(remainder > 0 && remainder < 4);
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/* Take only the first 8-(2*remainder) pixels from the first byte.
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* remainder is number between 1 and 3 (not zero!) that represents
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* the alignment of the pixel bits in the source.
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*/
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indata = *src++;
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shift = (remainder << 1);
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#ifdef CONFIG_NX_PACKEDMSFIRST
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/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-(2*remainder-1)
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* are carried over to the first pass through the loop. For
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* example if remainder == 1:
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*
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* indata: xxAA AAAA maps to nextdata: AAAA AAxx
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*/
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nextdata = (indata << shift);
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#else
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/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits (7-2*remainder)-7
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* are carried over to the first pass through the loop. For example
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* if remainder == 1:
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*
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* indata: AAAA AAxx maps to nextdata: xxAA AAAA
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*/
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nextdata = (indata >> shift);
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#endif
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/* Loop until all pixels have been packed into the destination. Note:
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* a outpixels increments by 8 so a few extra pixels will be packed on
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* the output. This should not be an issue.
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*/
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while (outpixels < npixels)
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{
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/* Get the next byte from the source */
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indata = *src++;
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outdata = nextdata;
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/* remainder is number between 1 and 3 (not zero!) that represents
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* the alignment of the pixel bits in the source.
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*/
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#ifdef CONFIG_NX_PACKEDMSFIRST
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/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits (7-2*remainder)-7
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* are carried over from that last pass through the loop. For example
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* if remainder == 1:
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*
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* nextdata = AAAA AAxx - dest = AAAA AABB
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* src = BBCC CCCC - nextdata = CCCC CCxx
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*/
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outdata |= (indata >> (8 - shift));
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nextdata = (indata << shift);
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#else
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/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(2*remainder-1)
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* are carried over from that last pass through the loop. For example
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* if remainder == 1:
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*
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* nextdata = xxAA AAAA - dest = BBAA AAAA
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* src = CCCC CCBB - nextdata = xxCC CCCC
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*/
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outdata |= (indata << (8 - shift));
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nextdata = (indata >> shift);
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#endif
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/* Transfer the byte to the run buffer */
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*dest++ = outdata;
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outpixels += 4;
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}
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}
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#elif NXGLIB_BITSPERPIXEL == 4
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static inline void
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nxgl_copyrun_4bpp(FAR const uint8_t *src, FAR uint8_t *dest,
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unsigned int remainder, size_t npixels)
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{
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uint8_t indata;
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uint8_t outdata;
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uint8_t nextdata;
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unsigned int outpixels = 0;
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DEBUGASSERT(remainder == 1);
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/* Take only the first 8-remainder pixels from the first byte.
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* remainder is number between 1 and 3 (not zero!) that represents
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* the alignment of the pixel bits in the source.
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*/
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indata = *src++;
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#ifdef CONFIG_NX_PACKEDMSFIRST
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/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-3
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* are carried over to the first pass through the loop. For
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* example:
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*
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* indata: xxxx AAAA maps to nextdata: AAAA xxxx
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*/
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nextdata = (indata << 4);
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#else
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/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 4-7
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* are carried over to the first pass through the loop. For example:
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*
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* indata: AAAA xxxx maps to nextdata: xxxx AAAA
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*/
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nextdata = (indata >> 4);
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#endif
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/* Loop until all pixels have been packed into the destination. Note:
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* a outpixels increments by 8 so a few extra pixels will be packed on
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* the output. This should not be an issue.
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*/
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while (outpixels < npixels)
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{
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/* Get the next byte from the source */
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indata = *src++;
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outdata = nextdata;
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/* remainder is number between 1 and 3 (not zero!) that represents
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* the alignment of the pixel bits in the source.
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*/
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#ifdef CONFIG_NX_PACKEDMSFIRST
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/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 4-7
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* are carried over from that last pass through the loop (or are
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* ignored initially. For example if remainder == 1:
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*
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* nextdata = AAAA xxxx - dest = AAAA BBBB
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* src = BBBB CCCC - nextdata = CCCC xxxx
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*/
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outdata |= (indata >> 4);
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nextdata = (indata << 4);
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#else
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/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(remainder-1)
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* are carried over from that last pass through the loop (or are
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* ignored initially). For example if remainder == 2:
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*
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* nextdata = xxAA AAAA - dest = BBAA AAAA
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* src = CCCC CCBB - nextdata = xxCC CCCC
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*/
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outdata |= (indata << 4);
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nextdata = (indata >> 4);
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#endif
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/* Transfer the byte to the run buffer */
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*dest++ = outdata;
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outpixels += 2;
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}
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}
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#endif
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#endif /* __GRAPHICS_NXGLIB_NXGLIB_COPYRUN_H */
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