82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* *****************************************************************************
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* image/16bits.c -- encode and decode from 16-bits 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_16bits:
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* Convert from 16-bit format to 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_16bits(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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uint16_t *st = (uint16_t*)raw;
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const unsigned int rmask = 0x1F << 11, gmask = 0x3F << 5, bmask = 0x1F;
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for (int i = 0; i < cell_count; i++) {
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/* get colors
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* as colors don't occupy 8-bits each, we'll "split into equal
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* halves out of 256";
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* e.g. red can go from 0b00000 to 0b11111, then in 8-bits it
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* will go from 0b00000000 to 0b11111000. */
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unsigned int r = (*st & rmask) >> 8;
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unsigned int g = (*st & gmask) >> 3;
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unsigned int b = (*st++ & bmask) << 3;
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/* put pixel */
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*cell++ = (r << 16) | (g << 8) | b;
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}
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}
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/**
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* g1m_pixels_to_16bits:
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* Convert from 32-bit matrix to 16-bit pixels (R5G6B5).
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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_16bits(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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uint16_t *d = (uint16_t*)dest;
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const uint32_t rmask = 0x1F << 19, gmask = 0x3F << 10, bmask = 0x1F << 3;
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for (int i = 0; i < cell_count; i++) {
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/* get colors */
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unsigned int r = (*cell & rmask) >> 19;
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unsigned int g = (*cell & gmask) >> 10;
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unsigned int b = (*cell++ & bmask) >> 3;
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/* put pixel */
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*d++ += (r << 11) | (g << 5) | b;
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}
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}
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