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Diffstat (limited to 'nuttx/graphics/nxglib/nxglib_copyrun.h')
| -rw-r--r-- | nuttx/graphics/nxglib/nxglib_copyrun.h | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/nuttx/graphics/nxglib/nxglib_copyrun.h b/nuttx/graphics/nxglib/nxglib_copyrun.h new file mode 100644 index 000000000..b97372bf7 --- /dev/null +++ b/nuttx/graphics/nxglib/nxglib_copyrun.h @@ -0,0 +1,346 @@ +/**************************************************************************** + * graphics/nxglib/nxsglib_copyrun.h + * + * Copyright (C) 2010 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. + * + ****************************************************************************/ + +#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 */ + + |