313 lines
9.2 KiB
C
313 lines
9.2 KiB
C
/****************************************************************************
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* graphics/nxglib/nxglib_copyrun.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <assert.h>
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/****************************************************************************
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* Public Functions Definitions
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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
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* 0-(2*remainder-1) are carried over from that last pass through the
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* loop. For example 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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