78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/* *****************************************************************************
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* image/packed1bit.c -- encode and decode from packed monochrome encoded image.
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* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libg1m.
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* libg1m is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libg1m is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libg1m; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************** */
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#include <libg1m/internals.h>
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/**
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* g1m_pixels_from_packed1bit:
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* Convert packed monochrome formatted pixels to the final 32-bit matrix.
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*
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* @arg pixels the final pixels.
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* @arg raw the raw data.
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* @arg width the width.
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* @arg height the height.
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*/
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void g1m_pixels_from_packed1bit(uint32_t **pixels, unsigned char *raw,
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int width, int height)
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{
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uint32_t *cell = (uint32_t*)&pixels[height];
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int cell_count = width * height;
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/* fill cells */
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int byte = 0x80;
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for (int i = 0; i < cell_count; i++) {
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/* get pixel and iterate */
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int pixel = *raw & byte;
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raw += byte & 1;
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byte = (byte >> 1) | ((byte & 1) << 7);
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/* put pixel */
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*cell++ = (pixel != 0) * 0xffffff;
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}
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}
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/**
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* g1m_pixels_to_packed1bit:
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* Convert 32-bit matrix to packed monochrome pixels.
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*
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* @arg dest the destination buffer.
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* @arg pixels the decoded pixels.
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* @arg width the width.
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* @arg height the height.
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*/
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void g1m_pixels_to_packed1bit(unsigned char *dest, uint32_t **pixels,
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int width, int height)
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{
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uint32_t *cell = (uint32_t*)&pixels[height];
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int cell_count = width * height;
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/* fill */
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int byte = 0x80;
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for (int i = 0; i < cell_count; i++) {
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/* get pixel */
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int pixel = ((*cell++ & 0xffffff) != 0) * byte;
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*dest |= pixel;
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/* iterate */
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dest += byte & 1;
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byte = (byte >> 1) | ((byte & 1) << 7);
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}
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}
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