diff --git a/src/qoi/phoboslab_qoi/qoi.h b/src/qoi/phoboslab_qoi/qoi.h index 8b7f87d..871d107 100644 --- a/src/qoi/phoboslab_qoi/qoi.h +++ b/src/qoi/phoboslab_qoi/qoi.h @@ -1,30 +1,10 @@ /* -QOI - The "Quite OK Image" format for fast, lossless image compression - -Dominic Szablewski - https://phoboslab.org - - --- LICENSE: The MIT License(MIT) +Copyright (c) 2021, Dominic Szablewski - https://phoboslab.org +SPDX-License-Identifier: MIT -Copyright(c) 2021 Dominic Szablewski - -Permission is hereby granted, free of charge, to any person obtaining a copy of -this software and associated documentation files(the "Software"), to deal in -the Software without restriction, including without limitation the rights to -use, copy, modify, merge, publish, distribute, sublicense, and / or sell copies -of the Software, and to permit persons to whom the Software is furnished to do -so, subject to the following conditions : -The above copyright notice and this permission notice shall be included in all -copies or substantial portions of the Software. -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE -AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE -SOFTWARE. +QOI - The "Quite OK Image" format for fast, lossless image compression -- About @@ -44,10 +24,10 @@ stb_image_write QOI offers 20x-50x faster encoding, 3x-4x faster decoding and // Encode and store an RGBA buffer to the file system. The qoi_desc describes // the input pixel data. qoi_write("image_new.qoi", rgba_pixels, &(qoi_desc){ - .width = 1920, - .height = 1080, - .channels = 4, - .colorspace = QOI_SRGB + .width = 1920, + .height = 1080, + .channels = 4, + .colorspace = QOI_SRGB }); // Load and decode a QOI image from the file system into a 32bbp RGBA buffer. @@ -84,11 +64,11 @@ A QOI file has a 14 byte header, followed by any number of data "chunks" and an 8-byte end marker. struct qoi_header_t { - char magic[4]; // magic bytes "qoif" - uint32_t width; // image width in pixels (BE) - uint32_t height; // image height in pixels (BE) - uint8_t channels; // 3 = RGB, 4 = RGBA - uint8_t colorspace; // 0 = sRGB with linear alpha, 1 = all channels linear + char magic[4]; // magic bytes "qoif" + uint32_t width; // image width in pixels (BE) + uint32_t height; // image height in pixels (BE) + uint8_t channels; // 3 = RGB, 4 = RGBA + uint8_t colorspace; // 0 = sRGB with linear alpha, 1 = all channels linear }; Images are encoded row by row, left to right, top to bottom. The decoder and @@ -111,7 +91,7 @@ the color value. In the encoder, if the pixel value at the index matches the current pixel, this index position is written to the stream as QOI_OP_INDEX. The hash function for the index is: - index_position = (r * 3 + g * 5 + b * 7 + a * 11) % 64 + index_position = (r * 3 + g * 5 + b * 7 + a * 11) % 64 Each chunk starts with a 2- or 8-bit tag, followed by a number of data bits. The bit length of chunks is divisible by 8 - i.e. all chunks are byte aligned. All @@ -173,8 +153,8 @@ The alpha value remains unchanged from the previous pixel. The green channel is used to indicate the general direction of change and is encoded in 6 bits. The red and blue channels (dr and db) base their diffs off of the green channel difference and are encoded in 4 bits. I.e.: - dr_dg = (cur_px.r - prev_px.r) - (cur_px.g - prev_px.g) - db_dg = (cur_px.b - prev_px.b) - (cur_px.g - prev_px.g) + dr_dg = (cur_px.r - prev_px.r) - (cur_px.g - prev_px.g) + db_dg = (cur_px.b - prev_px.b) - (cur_px.g - prev_px.g) The difference to the current channel values are using a wraparound operation, so "10 - 13" will result in 253, while "250 + 7" will result in 1. @@ -227,6 +207,7 @@ The alpha value remains unchanged from the previous pixel. */ + /* ----------------------------------------------------------------------------- Header - Public functions */ @@ -234,83 +215,86 @@ Header - Public functions */ #define QOI_H #ifdef __cplusplus -extern "C" -{ +extern "C" { #endif - /* A pointer to a qoi_desc struct has to be supplied to all of qoi's functions. - It describes either the input format (for qoi_write and qoi_encode), or is - filled with the description read from the file header (for qoi_read and - qoi_decode). +/* A pointer to a qoi_desc struct has to be supplied to all of qoi's functions. +It describes either the input format (for qoi_write and qoi_encode), or is +filled with the description read from the file header (for qoi_read and +qoi_decode). - The colorspace in this qoi_desc is an enum where - 0 = sRGB, i.e. gamma scaled RGB channels and a linear alpha channel - 1 = all channels are linear - You may use the constants QOI_SRGB or QOI_LINEAR. The colorspace is purely - informative. It will be saved to the file header, but does not affect - how chunks are en-/decoded. */ +The colorspace in this qoi_desc is an enum where + 0 = sRGB, i.e. gamma scaled RGB channels and a linear alpha channel + 1 = all channels are linear +You may use the constants QOI_SRGB or QOI_LINEAR. The colorspace is purely +informative. It will be saved to the file header, but does not affect +how chunks are en-/decoded. */ -#define QOI_SRGB 0 +#define QOI_SRGB 0 #define QOI_LINEAR 1 - typedef struct - { - unsigned int width; - unsigned int height; - unsigned char channels; - unsigned char colorspace; - } qoi_desc; +typedef struct { + unsigned int width; + unsigned int height; + unsigned char channels; + unsigned char colorspace; +} qoi_desc; #ifndef QOI_NO_STDIO - /* Encode raw RGB or RGBA pixels into a QOI image and write it to the file - system. The qoi_desc struct must be filled with the image width, height, - number of channels (3 = RGB, 4 = RGBA) and the colorspace. +/* Encode raw RGB or RGBA pixels into a QOI image and write it to the file +system. The qoi_desc struct must be filled with the image width, height, +number of channels (3 = RGB, 4 = RGBA) and the colorspace. + +The function returns 0 on failure (invalid parameters, or fopen or malloc +failed) or the number of bytes written on success. */ - The function returns 0 on failure (invalid parameters, or fopen or malloc - failed) or the number of bytes written on success. */ +int qoi_write(const char *filename, const void *data, const qoi_desc *desc); - int qoi_write(const char *filename, const void *data, const qoi_desc *desc); - /* Read and decode a QOI image from the file system. If channels is 0, the - number of channels from the file header is used. If channels is 3 or 4 the - output format will be forced into this number of channels. +/* Read and decode a QOI image from the file system. If channels is 0, the +number of channels from the file header is used. If channels is 3 or 4 the +output format will be forced into this number of channels. - The function either returns NULL on failure (invalid data, or malloc or fopen - failed) or a pointer to the decoded pixels. On success, the qoi_desc struct - will be filled with the description from the file header. +The function either returns NULL on failure (invalid data, or malloc or fopen +failed) or a pointer to the decoded pixels. On success, the qoi_desc struct +will be filled with the description from the file header. - The returned pixel data should be free()d after use. */ +The returned pixel data should be free()d after use. */ - void *qoi_read(const char *filename, qoi_desc *desc, int channels); +void *qoi_read(const char *filename, qoi_desc *desc, int channels); #endif /* QOI_NO_STDIO */ - /* Encode raw RGB or RGBA pixels into a QOI image in memory. - The function either returns NULL on failure (invalid parameters or malloc - failed) or a pointer to the encoded data on success. On success the out_len - is set to the size in bytes of the encoded data. +/* Encode raw RGB or RGBA pixels into a QOI image in memory. - The returned qoi data should be free()d after use. */ +The function either returns NULL on failure (invalid parameters or malloc +failed) or a pointer to the encoded data on success. On success the out_len +is set to the size in bytes of the encoded data. - void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len); +The returned qoi data should be free()d after use. */ - /* Decode a QOI image from memory. +void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len); - The function either returns NULL on failure (invalid parameters or malloc - failed) or a pointer to the decoded pixels. On success, the qoi_desc struct - is filled with the description from the file header. - The returned pixel data should be free()d after use. */ +/* Decode a QOI image from memory. + +The function either returns NULL on failure (invalid parameters or malloc +failed) or a pointer to the decoded pixels. On success, the qoi_desc struct +is filled with the description from the file header. + +The returned pixel data should be free()d after use. */ + +void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels); - void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels); #ifdef __cplusplus } #endif #endif /* QOI_H */ + /* ----------------------------------------------------------------------------- Implementation */ @@ -320,26 +304,26 @@ Implementation */ #include "Python.h" #ifndef QOI_MALLOC -#define QOI_MALLOC(sz) malloc(sz) -#define QOI_FREE(p) free(p) + #define QOI_MALLOC(sz) malloc(sz) + #define QOI_FREE(p) free(p) #endif #ifndef QOI_ZEROARR -#define QOI_ZEROARR(a) memset((a), 0, sizeof(a)) + #define QOI_ZEROARR(a) memset((a),0,sizeof(a)) #endif -#define QOI_OP_INDEX 0x00 /* 00xxxxxx */ -#define QOI_OP_DIFF 0x40 /* 01xxxxxx */ -#define QOI_OP_LUMA 0x80 /* 10xxxxxx */ -#define QOI_OP_RUN 0xc0 /* 11xxxxxx */ -#define QOI_OP_RGB 0xfe /* 11111110 */ -#define QOI_OP_RGBA 0xff /* 11111111 */ +#define QOI_OP_INDEX 0x00 /* 00xxxxxx */ +#define QOI_OP_DIFF 0x40 /* 01xxxxxx */ +#define QOI_OP_LUMA 0x80 /* 10xxxxxx */ +#define QOI_OP_RUN 0xc0 /* 11xxxxxx */ +#define QOI_OP_RGB 0xfe /* 11111110 */ +#define QOI_OP_RGBA 0xff /* 11111111 */ -#define QOI_MASK_2 0xc0 /* 11000000 */ +#define QOI_MASK_2 0xc0 /* 11000000 */ -#define QOI_COLOR_HASH(C) (C.rgba.r * 3 + C.rgba.g * 5 + C.rgba.b * 7 + C.rgba.a * 11) -#define QOI_MAGIC \ - (((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \ - ((unsigned int)'i') << 8 | ((unsigned int)'f')) +#define QOI_COLOR_HASH(C) (C.rgba.r*3 + C.rgba.g*5 + C.rgba.b*7 + C.rgba.a*11) +#define QOI_MAGIC \ + (((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \ + ((unsigned int)'i') << 8 | ((unsigned int)'f')) #define QOI_HEADER_SIZE 14 /* 2GB is the max file size that this implementation can safely handle. We guard @@ -348,357 +332,318 @@ pixel, rounded down to a nice clean value. 400 million pixels ought to be enough for anybody. */ #define QOI_PIXELS_MAX ((unsigned int)400000000) -typedef union -{ - struct - { - unsigned char r, g, b, a; - } rgba; - unsigned int v; +typedef union { + struct { unsigned char r, g, b, a; } rgba; + unsigned int v; } qoi_rgba_t; -static const unsigned char qoi_padding[8] = {0, 0, 0, 0, 0, 0, 0, 1}; +static const unsigned char qoi_padding[8] = {0,0,0,0,0,0,0,1}; -static void qoi_write_32(unsigned char *bytes, int *p, unsigned int v) -{ - bytes[(*p)++] = (0xff000000 & v) >> 24; - bytes[(*p)++] = (0x00ff0000 & v) >> 16; - bytes[(*p)++] = (0x0000ff00 & v) >> 8; - bytes[(*p)++] = (0x000000ff & v); +static void qoi_write_32(unsigned char *bytes, int *p, unsigned int v) { + bytes[(*p)++] = (0xff000000 & v) >> 24; + bytes[(*p)++] = (0x00ff0000 & v) >> 16; + bytes[(*p)++] = (0x0000ff00 & v) >> 8; + bytes[(*p)++] = (0x000000ff & v); } -static unsigned int qoi_read_32(const unsigned char *bytes, int *p) -{ - unsigned int a = bytes[(*p)++]; - unsigned int b = bytes[(*p)++]; - unsigned int c = bytes[(*p)++]; - unsigned int d = bytes[(*p)++]; - return a << 24 | b << 16 | c << 8 | d; +static unsigned int qoi_read_32(const unsigned char *bytes, int *p) { + unsigned int a = bytes[(*p)++]; + unsigned int b = bytes[(*p)++]; + unsigned int c = bytes[(*p)++]; + unsigned int d = bytes[(*p)++]; + return a << 24 | b << 16 | c << 8 | d; } -void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len) -{ - int i, max_size, p, run; - int px_len, px_end, px_pos, channels; - unsigned char *bytes; - const unsigned char *pixels; - qoi_rgba_t index[64]; - qoi_rgba_t px, px_prev; - - if ( - data == NULL || out_len == NULL || desc == NULL || - desc->width == 0 || desc->height == 0 || - desc->channels < 3 || desc->channels > 4 || - desc->colorspace > 1 || - desc->height >= QOI_PIXELS_MAX / desc->width) - { - return NULL; - } - - max_size = - desc->width * desc->height * (desc->channels + 1) + - QOI_HEADER_SIZE + sizeof(qoi_padding); - - p = 0; - bytes = (unsigned char *)QOI_MALLOC(max_size); - if (!bytes) - { - return NULL; - } - - qoi_write_32(bytes, &p, QOI_MAGIC); - qoi_write_32(bytes, &p, desc->width); - qoi_write_32(bytes, &p, desc->height); - bytes[p++] = desc->channels; - bytes[p++] = desc->colorspace; - - pixels = (const unsigned char *)data; - - QOI_ZEROARR(index); - - run = 0; - px_prev.rgba.r = 0; - px_prev.rgba.g = 0; - px_prev.rgba.b = 0; - px_prev.rgba.a = 255; - px = px_prev; - - px_len = desc->width * desc->height * desc->channels; - px_end = px_len - desc->channels; - channels = desc->channels; - - for (px_pos = 0; px_pos < px_len; px_pos += channels) - { - px.rgba.r = pixels[px_pos + 0]; - px.rgba.g = pixels[px_pos + 1]; - px.rgba.b = pixels[px_pos + 2]; - - if (channels == 4) - { - px.rgba.a = pixels[px_pos + 3]; - } - - if (px.v == px_prev.v) - { - run++; - if (run == 62 || px_pos == px_end) - { - bytes[p++] = QOI_OP_RUN | (run - 1); - run = 0; - } - } - else - { - int index_pos; - - if (run > 0) - { - bytes[p++] = QOI_OP_RUN | (run - 1); - run = 0; - } - - index_pos = QOI_COLOR_HASH(px) % 64; - - if (index[index_pos].v == px.v) - { - bytes[p++] = QOI_OP_INDEX | index_pos; - } - else - { - index[index_pos] = px; - - if (px.rgba.a == px_prev.rgba.a) - { - signed char vr = px.rgba.r - px_prev.rgba.r; - signed char vg = px.rgba.g - px_prev.rgba.g; - signed char vb = px.rgba.b - px_prev.rgba.b; - - signed char vg_r = vr - vg; - signed char vg_b = vb - vg; - - if ( - vr > -3 && vr < 2 && - vg > -3 && vg < 2 && - vb > -3 && vb < 2) - { - bytes[p++] = QOI_OP_DIFF | (vr + 2) << 4 | (vg + 2) << 2 | (vb + 2); - } - else if ( - vg_r > -9 && vg_r < 8 && - vg > -33 && vg < 32 && - vg_b > -9 && vg_b < 8) - { - bytes[p++] = QOI_OP_LUMA | (vg + 32); - bytes[p++] = (vg_r + 8) << 4 | (vg_b + 8); - } - else - { - bytes[p++] = QOI_OP_RGB; - bytes[p++] = px.rgba.r; - bytes[p++] = px.rgba.g; - bytes[p++] = px.rgba.b; - } - } - else - { - bytes[p++] = QOI_OP_RGBA; - bytes[p++] = px.rgba.r; - bytes[p++] = px.rgba.g; - bytes[p++] = px.rgba.b; - bytes[p++] = px.rgba.a; - } - } - } - px_prev = px; - } - - for (i = 0; i < (int)sizeof(qoi_padding); i++) - { - bytes[p++] = qoi_padding[i]; - } - - *out_len = p; - return bytes; +void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len) { + int i, max_size, p, run; + int px_len, px_end, px_pos, channels; + unsigned char *bytes; + const unsigned char *pixels; + qoi_rgba_t index[64]; + qoi_rgba_t px, px_prev; + + if ( + data == NULL || out_len == NULL || desc == NULL || + desc->width == 0 || desc->height == 0 || + desc->channels < 3 || desc->channels > 4 || + desc->colorspace > 1 || + desc->height >= QOI_PIXELS_MAX / desc->width + ) { + return NULL; + } + + max_size = + desc->width * desc->height * (desc->channels + 1) + + QOI_HEADER_SIZE + sizeof(qoi_padding); + + p = 0; + bytes = (unsigned char *) QOI_MALLOC(max_size); + if (!bytes) { + return NULL; + } + + qoi_write_32(bytes, &p, QOI_MAGIC); + qoi_write_32(bytes, &p, desc->width); + qoi_write_32(bytes, &p, desc->height); + bytes[p++] = desc->channels; + bytes[p++] = desc->colorspace; + + + pixels = (const unsigned char *)data; + + QOI_ZEROARR(index); + + run = 0; + px_prev.rgba.r = 0; + px_prev.rgba.g = 0; + px_prev.rgba.b = 0; + px_prev.rgba.a = 255; + px = px_prev; + + px_len = desc->width * desc->height * desc->channels; + px_end = px_len - desc->channels; + channels = desc->channels; + + for (px_pos = 0; px_pos < px_len; px_pos += channels) { + px.rgba.r = pixels[px_pos + 0]; + px.rgba.g = pixels[px_pos + 1]; + px.rgba.b = pixels[px_pos + 2]; + + if (channels == 4) { + px.rgba.a = pixels[px_pos + 3]; + } + + if (px.v == px_prev.v) { + run++; + if (run == 62 || px_pos == px_end) { + bytes[p++] = QOI_OP_RUN | (run - 1); + run = 0; + } + } + else { + int index_pos; + + if (run > 0) { + bytes[p++] = QOI_OP_RUN | (run - 1); + run = 0; + } + + index_pos = QOI_COLOR_HASH(px) % 64; + + if (index[index_pos].v == px.v) { + bytes[p++] = QOI_OP_INDEX | index_pos; + } + else { + index[index_pos] = px; + + if (px.rgba.a == px_prev.rgba.a) { + signed char vr = px.rgba.r - px_prev.rgba.r; + signed char vg = px.rgba.g - px_prev.rgba.g; + signed char vb = px.rgba.b - px_prev.rgba.b; + + signed char vg_r = vr - vg; + signed char vg_b = vb - vg; + + if ( + vr > -3 && vr < 2 && + vg > -3 && vg < 2 && + vb > -3 && vb < 2 + ) { + bytes[p++] = QOI_OP_DIFF | (vr + 2) << 4 | (vg + 2) << 2 | (vb + 2); + } + else if ( + vg_r > -9 && vg_r < 8 && + vg > -33 && vg < 32 && + vg_b > -9 && vg_b < 8 + ) { + bytes[p++] = QOI_OP_LUMA | (vg + 32); + bytes[p++] = (vg_r + 8) << 4 | (vg_b + 8); + } + else { + bytes[p++] = QOI_OP_RGB; + bytes[p++] = px.rgba.r; + bytes[p++] = px.rgba.g; + bytes[p++] = px.rgba.b; + } + } + else { + bytes[p++] = QOI_OP_RGBA; + bytes[p++] = px.rgba.r; + bytes[p++] = px.rgba.g; + bytes[p++] = px.rgba.b; + bytes[p++] = px.rgba.a; + } + } + } + px_prev = px; + } + + for (i = 0; i < (int)sizeof(qoi_padding); i++) { + bytes[p++] = qoi_padding[i]; + } + + *out_len = p; + return bytes; } -void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels) -{ - const unsigned char *bytes; - unsigned int header_magic; - unsigned char *pixels; - qoi_rgba_t index[64]; - qoi_rgba_t px; - int px_len, chunks_len, px_pos; - int p = 0, run = 0; - - if ( - data == NULL || desc == NULL || - (channels != 0 && channels != 3 && channels != 4) || - size < QOI_HEADER_SIZE + (int)sizeof(qoi_padding)) - { - return NULL; - } - - bytes = (const unsigned char *)data; - - header_magic = qoi_read_32(bytes, &p); - desc->width = qoi_read_32(bytes, &p); - desc->height = qoi_read_32(bytes, &p); - desc->channels = bytes[p++]; - desc->colorspace = bytes[p++]; - - if ( - desc->width == 0 || desc->height == 0 || - desc->channels < 3 || desc->channels > 4 || - desc->colorspace > 1 || - header_magic != QOI_MAGIC || - desc->height >= QOI_PIXELS_MAX / desc->width) - { - return NULL; - } - - if (channels == 0) - { - channels = desc->channels; - } - - px_len = desc->width * desc->height * channels; - pixels = (unsigned char *)QOI_MALLOC(px_len); - if (!pixels) - { - return NULL; - } - - QOI_ZEROARR(index); - px.rgba.r = 0; - px.rgba.g = 0; - px.rgba.b = 0; - px.rgba.a = 255; - - chunks_len = size - (int)sizeof(qoi_padding); - for (px_pos = 0; px_pos < px_len; px_pos += channels) - { - if (run > 0) - { - run--; - } - else if (p < chunks_len) - { - int b1 = bytes[p++]; - - if (b1 == QOI_OP_RGB) - { - px.rgba.r = bytes[p++]; - px.rgba.g = bytes[p++]; - px.rgba.b = bytes[p++]; - } - else if (b1 == QOI_OP_RGBA) - { - px.rgba.r = bytes[p++]; - px.rgba.g = bytes[p++]; - px.rgba.b = bytes[p++]; - px.rgba.a = bytes[p++]; - } - else if ((b1 & QOI_MASK_2) == QOI_OP_INDEX) - { - px = index[b1]; - } - else if ((b1 & QOI_MASK_2) == QOI_OP_DIFF) - { - px.rgba.r += ((b1 >> 4) & 0x03) - 2; - px.rgba.g += ((b1 >> 2) & 0x03) - 2; - px.rgba.b += (b1 & 0x03) - 2; - } - else if ((b1 & QOI_MASK_2) == QOI_OP_LUMA) - { - int b2 = bytes[p++]; - int vg = (b1 & 0x3f) - 32; - px.rgba.r += vg - 8 + ((b2 >> 4) & 0x0f); - px.rgba.g += vg; - px.rgba.b += vg - 8 + (b2 & 0x0f); - } - else if ((b1 & QOI_MASK_2) == QOI_OP_RUN) - { - run = (b1 & 0x3f); - } - - index[QOI_COLOR_HASH(px) % 64] = px; - } - - pixels[px_pos + 0] = px.rgba.r; - pixels[px_pos + 1] = px.rgba.g; - pixels[px_pos + 2] = px.rgba.b; - - if (channels == 4) - { - pixels[px_pos + 3] = px.rgba.a; - } - } - - return pixels; +void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels) { + const unsigned char *bytes; + unsigned int header_magic; + unsigned char *pixels; + qoi_rgba_t index[64]; + qoi_rgba_t px; + int px_len, chunks_len, px_pos; + int p = 0, run = 0; + + if ( + data == NULL || desc == NULL || + (channels != 0 && channels != 3 && channels != 4) || + size < QOI_HEADER_SIZE + (int)sizeof(qoi_padding) + ) { + return NULL; + } + + bytes = (const unsigned char *)data; + + header_magic = qoi_read_32(bytes, &p); + desc->width = qoi_read_32(bytes, &p); + desc->height = qoi_read_32(bytes, &p); + desc->channels = bytes[p++]; + desc->colorspace = bytes[p++]; + + if ( + desc->width == 0 || desc->height == 0 || + desc->channels < 3 || desc->channels > 4 || + desc->colorspace > 1 || + header_magic != QOI_MAGIC || + desc->height >= QOI_PIXELS_MAX / desc->width + ) { + return NULL; + } + + if (channels == 0) { + channels = desc->channels; + } + + px_len = desc->width * desc->height * channels; + pixels = (unsigned char *) QOI_MALLOC(px_len); + if (!pixels) { + return NULL; + } + + QOI_ZEROARR(index); + px.rgba.r = 0; + px.rgba.g = 0; + px.rgba.b = 0; + px.rgba.a = 255; + + chunks_len = size - (int)sizeof(qoi_padding); + for (px_pos = 0; px_pos < px_len; px_pos += channels) { + if (run > 0) { + run--; + } + else if (p < chunks_len) { + int b1 = bytes[p++]; + + if (b1 == QOI_OP_RGB) { + px.rgba.r = bytes[p++]; + px.rgba.g = bytes[p++]; + px.rgba.b = bytes[p++]; + } + else if (b1 == QOI_OP_RGBA) { + px.rgba.r = bytes[p++]; + px.rgba.g = bytes[p++]; + px.rgba.b = bytes[p++]; + px.rgba.a = bytes[p++]; + } + else if ((b1 & QOI_MASK_2) == QOI_OP_INDEX) { + px = index[b1]; + } + else if ((b1 & QOI_MASK_2) == QOI_OP_DIFF) { + px.rgba.r += ((b1 >> 4) & 0x03) - 2; + px.rgba.g += ((b1 >> 2) & 0x03) - 2; + px.rgba.b += ( b1 & 0x03) - 2; + } + else if ((b1 & QOI_MASK_2) == QOI_OP_LUMA) { + int b2 = bytes[p++]; + int vg = (b1 & 0x3f) - 32; + px.rgba.r += vg - 8 + ((b2 >> 4) & 0x0f); + px.rgba.g += vg; + px.rgba.b += vg - 8 + (b2 & 0x0f); + } + else if ((b1 & QOI_MASK_2) == QOI_OP_RUN) { + run = (b1 & 0x3f); + } + + index[QOI_COLOR_HASH(px) % 64] = px; + } + + pixels[px_pos + 0] = px.rgba.r; + pixels[px_pos + 1] = px.rgba.g; + pixels[px_pos + 2] = px.rgba.b; + + if (channels == 4) { + pixels[px_pos + 3] = px.rgba.a; + } + } + + return pixels; } #ifndef QOI_NO_STDIO #include -int qoi_write(const char *filename, const void *data, const qoi_desc *desc) -{ - FILE *f = fopen(filename, "wb"); - int size; - void *encoded; - - if (!f) - { - return 0; - } - - encoded = qoi_encode(data, desc, &size); - if (!encoded) - { - fclose(f); - return 0; - } - - fwrite(encoded, 1, size, f); - fclose(f); - - QOI_FREE(encoded); - return size; +int qoi_write(const char *filename, const void *data, const qoi_desc *desc) { + FILE *f = fopen(filename, "wb"); + int size; + void *encoded; + + if (!f) { + return 0; + } + + encoded = qoi_encode(data, desc, &size); + if (!encoded) { + fclose(f); + return 0; + } + + fwrite(encoded, 1, size, f); + fclose(f); + + QOI_FREE(encoded); + return size; } -void *qoi_read(const char *filename, qoi_desc *desc, int channels) -{ - FILE *f = fopen(filename, "rb"); - int size, bytes_read; - void *pixels, *data; - - if (!f) - { - return NULL; - } - - fseek(f, 0, SEEK_END); - size = ftell(f); - if (size <= 0) - { - fclose(f); - return NULL; - } - fseek(f, 0, SEEK_SET); - - data = QOI_MALLOC(size); - if (!data) - { - fclose(f); - return NULL; - } - - bytes_read = fread(data, 1, size, f); - fclose(f); - - pixels = qoi_decode(data, bytes_read, desc, channels); - QOI_FREE(data); - return pixels; +void *qoi_read(const char *filename, qoi_desc *desc, int channels) { + FILE *f = fopen(filename, "rb"); + int size, bytes_read; + void *pixels, *data; + + if (!f) { + return NULL; + } + + fseek(f, 0, SEEK_END); + size = ftell(f); + if (size <= 0) { + fclose(f); + return NULL; + } + fseek(f, 0, SEEK_SET); + + data = QOI_MALLOC(size); + if (!data) { + fclose(f); + return NULL; + } + + bytes_read = fread(data, 1, size, f); + fclose(f); + + pixels = qoi_decode(data, bytes_read, desc, channels); + QOI_FREE(data); + return pixels; } #endif /* QOI_NO_STDIO */