73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* qoi_decode.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: maiboyer <maiboyer@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2023/12/25 22:31:40 by maiboyer #+# #+# */
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/* Updated: 2023/12/25 22:35:44 by maiboyer ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "me/img/qoi.h"
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#include "me/img/qoi/qoi_utils.h"
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#include "me/img/qoi/qoi_decode.h"
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static inline void *qoi_decode_inner(t_decode_vals *vals, const t_u8 *bytes,
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t_i32 channels, t_i32 size)
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{
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t_u8 *pixels;
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pixels = (t_u8 *)mem_alloc(vals->px_len);
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if (!pixels)
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return (NULL);
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mem_set_zero(vals->index, sizeof(vals->index));
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vals->px.v = 0;
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vals->px.rgba.a = 255;
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vals->chunks_len = size - (t_i32) sizeof(t_u8[8]);
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vals->px_pos = 0;
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while (vals->px_pos < vals->px_len)
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{
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if (vals->run > 0)
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vals->run--;
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else if (vals->p < vals->chunks_len)
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qoi_decode_inner_inner(vals, bytes);
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pixels[vals->px_pos + 0] = vals->px.rgba.r;
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pixels[vals->px_pos + 1] = vals->px.rgba.g;
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pixels[vals->px_pos + 2] = vals->px.rgba.b;
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if (channels == 4)
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pixels[vals->px_pos + 3] = vals->px.rgba.a;
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vals->px_pos += channels;
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}
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return (pixels);
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}
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void *qoi_decode(const void *data, t_i32 size, t_qoi_desc *desc,
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t_i32 channels)
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{
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const t_u8 *bytes;
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t_decode_vals vals;
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vals.p = 0;
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vals.run = 0;
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if (data == NULL || desc == NULL || (channels != 0 && channels != 3
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&& channels != 4) || size < QOI_HEADER_SIZE
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+ (t_i32) sizeof(t_u8[8]))
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return (NULL);
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bytes = (const t_u8 *)data;
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vals.header_magic = qoi_read_32(bytes, &vals.p);
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desc->width = qoi_read_32(bytes, &vals.p);
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desc->height = qoi_read_32(bytes, &vals.p);
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desc->channels = bytes[vals.p++];
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desc->colorspace = bytes[vals.p++];
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if (desc->width == 0 || desc->height == 0 || desc->channels < 3
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|| desc->channels > 4 || desc->colorspace > 1
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|| vals.header_magic != QOI_MAGIC || desc->height >= QOI_PIXELS_MAX
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/ desc->width)
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return (NULL);
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if (channels == 0)
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channels = desc->channels;
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vals.px_len = desc->width * desc->height * channels;
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return (qoi_decode_inner(&vals, bytes, channels, size));
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}
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