mirror of https://github.com/raysan5/raylib
REVIEWED: Updated QOI to first official release
This commit is contained in:
Ray
parent
71f2e2b1e4
commit
d1b8d4f2c7
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@ -45,12 +45,21 @@ than stbi_image or libpng.
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#define QOI_IMPLEMENTATION
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#include "qoi.h"
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// Load and decode a QOI image from the file system into a 32bbp RGBA buffer
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int width, height;
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void *rgba_pixels = qoi_read("image.qoi", &width, &height, 4);
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// Encode and store an RGBA buffer to the file system. The qoi_desc describes
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// the input pixel data.
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qoi_write("image_new.qoi", rgba_pixels, &(qoi_desc){
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.width = 1920,
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.height = 1080,
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.channels = 4,
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.colorspace = QOI_SRGB
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});
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// Load and decode a QOI image from the file system into a 32bbp RGBA buffer.
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// The qoi_desc struct will be filled with the width, height, number of channels
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// and colorspace read from the file header.
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qoi_desc desc;
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void *rgba_pixels = qoi_read("image.qoi", &desc, 4);
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// Encode and store an RGBA buffer to the file system
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qoi_write("image_new.qoi", rgba_pixels, width, height, 4);
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-- Documentation
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@ -72,13 +81,17 @@ you can define QOI_MALLOC and QOI_FREE before including this library.
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-- Data Format
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A QOI file has a 12 byte header, followed by any number of data "chunks".
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A QOI file has a 14 byte header, followed by any number of data "chunks".
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struct qoi_header_t {
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char [4]; // magic bytes "qoif"
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unsigned short width; // image width in pixels (BE)
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unsigned short height; // image height in pixels (BE)
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unsigned int size; // number of data bytes following this header (BE)
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char magic[4]; // magic bytes "qoif"
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uint32_t width; // image width in pixels (BE)
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uint32_t height; // image height in pixels (BE)
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uint8_t channels; // must be 3 (RGB) or 4 (RGBA)
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uint8_t colorspace; // a bitmap 0000rgba where
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// - a zero bit indicates sRGBA,
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// - a one bit indicates linear (user interpreted)
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// colorspace for each channel
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};
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The decoder and encoder start with {r: 0, g: 0, b: 0, a: 255} as the previous
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@ -113,24 +126,24 @@ QOI_RUN_16 {
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QOI_DIFF_8 {
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u8 tag : 2; // b10
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u8 dr : 2; // 2-bit red channel difference: -1..2
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u8 dg : 2; // 2-bit green channel difference: -1..2
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u8 db : 2; // 2-bit blue channel difference: -1..2
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u8 dr : 2; // 2-bit red channel difference: -2..1
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u8 dg : 2; // 2-bit green channel difference: -2..1
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u8 db : 2; // 2-bit blue channel difference: -2..1
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}
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QOI_DIFF_16 {
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u8 tag : 3; // b110
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u8 dr : 5; // 5-bit red channel difference: -15..16
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u8 dg : 4; // 4-bit green channel difference: -7.. 8
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u8 db : 4; // 4-bit blue channel difference: -7.. 8
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u8 dr : 5; // 5-bit red channel difference: -16..15
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u8 dg : 4; // 4-bit green channel difference: -8.. 7
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u8 db : 4; // 4-bit blue channel difference: -8.. 7
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}
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QOI_DIFF_24 {
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u8 tag : 4; // b1110
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u8 dr : 5; // 5-bit red channel difference: -15..16
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u8 dg : 5; // 5-bit green channel difference: -15..16
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u8 db : 5; // 5-bit blue channel difference: -15..16
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u8 da : 5; // 5-bit alpha channel difference: -15..16
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u8 dr : 5; // 5-bit red channel difference: -16..15
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u8 dg : 5; // 5-bit green channel difference: -16..15
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u8 db : 5; // 5-bit blue channel difference: -16..15
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u8 da : 5; // 5-bit alpha channel difference: -16..15
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}
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QOI_COLOR {
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@ -162,48 +175,75 @@ to check for an overrun once per decode loop iteration.
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extern "C" {
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#endif
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// A pointer to qoi_desc struct has to be supplied to all of qoi's functions. It
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// describes either the input format (for qoi_write, qoi_encode), or is filled
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// with the description read from the file header (for qoi_read, qoi_decode).
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// The colorspace in this qoi_desc is a bitmap with 0000rgba where a 0-bit
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// indicates sRGB and a 1-bit indicates linear colorspace for each channel. You
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// may use one of the predefined constants: QOI_SRGB, QOI_SRGB_LINEAR_ALPHA or
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// QOI_LINEAR. The colorspace is purely informative. It will be saved to the
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// file header, but does not affect en-/decoding in any way.
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#define QOI_SRGB 0x00
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#define QOI_SRGB_LINEAR_ALPHA 0x01
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#define QOI_LINEAR 0x0f
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typedef struct {
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unsigned int width;
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unsigned int height;
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unsigned char channels;
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unsigned char colorspace;
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} qoi_desc;
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#ifndef QOI_NO_STDIO
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// Encode raw RGB or RGBA pixels into a QOI image write it to the file system.
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// w and h denote the the width and height of the pixel data. channels must be
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// either 3 for RGB data or 4 for RGBA.
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// Encode raw RGB or RGBA pixels into a QOI image and write it to the file
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// system. The qoi_desc struct must be filled with the image width, height,
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// number of channels (3 = RGB, 4 = RGBA) and the colorspace.
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// The function returns 0 on failure (invalid parameters, or fopen or malloc
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// failed) or the number of bytes written on success.
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int qoi_write(const char *filename, const void *data, int w, int h, int channels);
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int qoi_write(const char *filename, const void *data, const qoi_desc *desc);
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// Read and decode a QOI image from the file system into either raw RGB
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// (channels=3) or RGBA (channels=4) pixel data.
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// Read and decode a QOI image from the file system. If channels is 0, the
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// number of channels from the file header is used. If channels is 3 or 4 the
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// output format will be forced into this number of channels.
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// The function either returns NULL on failure (invalid data, or malloc or fopen
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// failed) or a pointer to the decoded pixels. On success out_w and out_h will
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// be set to the width and height of the decoded image.
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// failed) or a pointer to the decoded pixels. On success, the qoi_desc struct
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// will be filled with the description from the file header.
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// The returned pixel data should be free()d after use.
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void *qoi_read(const char *filename, int *out_w, int *out_h, int channels);
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void *qoi_read(const char *filename, qoi_desc *desc, int channels);
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#endif // QOI_NO_STDIO
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// Encode raw RGB or RGBA pixels into a QOI image in memory. w and h denote the
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// width and height of the pixel data. channels must be either 3 for RGB data
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// or 4 for RGBA.
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// Encode raw RGB or RGBA pixels into a QOI image in memory.
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// The function either returns NULL on failure (invalid parameters or malloc
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// failed) or a pointer to the encoded data on success. On success the out_len
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// failed) or a pointer to the encoded data on success. On success the out_len
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// is set to the size in bytes of the encoded data.
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// The returned qoi data should be free()d after user.
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void *qoi_encode(const void *data, int w, int h, int channels, int *out_len);
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void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len);
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// Decode a QOI image from memory into either raw RGB (channels=3) or RGBA
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// (channels=4) pixel data.
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// Decode a QOI image from memory.
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// The function either returns NULL on failure (invalid parameters or malloc
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// failed) or a pointer to the decoded pixels. On success out_w and out_h will
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// be set to the width and height of the decoded image.
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// failed) or a pointer to the decoded pixels. On success, the qoi_desc struct
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// is filled with the description from the file header.
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// The returned pixel data should be free()d after use.
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void *qoi_decode(const void *data, int size, int *out_w, int *out_h, int channels);
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void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels);
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#ifdef __cplusplus
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}
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@ -238,7 +278,7 @@ void *qoi_decode(const void *data, int size, int *out_w, int *out_h, int channel
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#define QOI_MAGIC \
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(((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \
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((unsigned int)'i') << 8 | ((unsigned int)'f'))
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#define QOI_HEADER_SIZE 12
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#define QOI_HEADER_SIZE 14
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#define QOI_PADDING 4
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typedef union {
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@ -246,39 +286,35 @@ typedef union {
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unsigned int v;
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} qoi_rgba_t;
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void qoi_write_16(unsigned char *bytes, int *p, unsigned short v) {
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bytes[(*p)++] = (0xff00 & v) >> 8;
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bytes[(*p)++] = (0xff & v);
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}
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void qoi_write_32(unsigned char *bytes, int *p, unsigned int v) {
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qoi_write_16(bytes, p, (v & 0xffff0000) >> 16);
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qoi_write_16(bytes, p, (v & 0xffff));
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}
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unsigned int qoi_read_16(const unsigned char *bytes, int *p) {
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unsigned int a = bytes[(*p)++];
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unsigned int b = bytes[(*p)++];
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return (a << 8) | b;
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bytes[(*p)++] = (0xff000000 & v) >> 24;
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bytes[(*p)++] = (0x00ff0000 & v) >> 16;
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bytes[(*p)++] = (0x0000ff00 & v) >> 8;
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bytes[(*p)++] = (0x000000ff & v);
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}
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unsigned int qoi_read_32(const unsigned char *bytes, int *p) {
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unsigned int a = qoi_read_16(bytes, p);
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unsigned int b = qoi_read_16(bytes, p);
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return (a << 16) | b;
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unsigned int a = bytes[(*p)++];
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unsigned int b = bytes[(*p)++];
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unsigned int c = bytes[(*p)++];
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unsigned int d = bytes[(*p)++];
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return (a << 24) | (b << 16) | (c << 8) | d;
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}
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void *qoi_encode(const void *data, int w, int h, int channels, int *out_len) {
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void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len) {
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if (
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data == NULL || out_len == NULL ||
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w <= 0 || w >= (1 << 16) ||
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h <= 0 || h >= (1 << 16) ||
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channels < 3 || channels > 4
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data == NULL || out_len == NULL || desc == NULL ||
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desc->width == 0 || desc->height == 0 ||
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desc->channels < 3 || desc->channels > 4 ||
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(desc->colorspace & 0xf0) != 0
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) {
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return NULL;
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}
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int max_size = w * h * (channels + 1) + QOI_HEADER_SIZE + QOI_PADDING;
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int max_size =
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desc->width * desc->height * (desc->channels + 1) +
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QOI_HEADER_SIZE + QOI_PADDING;
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int p = 0;
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unsigned char *bytes = QOI_MALLOC(max_size);
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if (!bytes) {
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@ -286,9 +322,11 @@ void *qoi_encode(const void *data, int w, int h, int channels, int *out_len) {
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}
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qoi_write_32(bytes, &p, QOI_MAGIC);
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qoi_write_16(bytes, &p, w);
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qoi_write_16(bytes, &p, h);
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qoi_write_32(bytes, &p, 0); // size, will be set later
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qoi_write_32(bytes, &p, desc->width);
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qoi_write_32(bytes, &p, desc->height);
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bytes[p++] = desc->channels;
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bytes[p++] = desc->colorspace;
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const unsigned char *pixels = (const unsigned char *)data;
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@ -297,11 +335,11 @@ void *qoi_encode(const void *data, int w, int h, int channels, int *out_len) {
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int run = 0;
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qoi_rgba_t px_prev = {.rgba = {.r = 0, .g = 0, .b = 0, .a = 255}};
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qoi_rgba_t px = px_prev;
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int px_len = w * h * channels;
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int px_end = px_len - channels;
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for (int px_pos = 0; px_pos < px_len; px_pos += channels) {
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if (channels == 4) {
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int px_len = desc->width * desc->height * desc->channels;
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int px_end = px_len - desc->channels;
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for (int px_pos = 0; px_pos < px_len; px_pos += desc->channels) {
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if (desc->channels == 4) {
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px = *(qoi_rgba_t *)(pixels + px_pos);
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}
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else {
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@ -342,26 +380,26 @@ void *qoi_encode(const void *data, int w, int h, int channels, int *out_len) {
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int va = px.rgba.a - px_prev.rgba.a;
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if (
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vr > -16 && vr < 17 && vg > -16 && vg < 17 &&
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vb > -16 && vb < 17 && va > -16 && va < 17
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vr > -17 && vr < 16 && vg > -17 && vg < 16 &&
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vb > -17 && vb < 16 && va > -17 && va < 16
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) {
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if (
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va == 0 && vr > -2 && vr < 3 &&
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vg > -2 && vg < 3 && vb > -2 && vb < 3
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va == 0 && vr > -3 && vr < 2 &&
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vg > -3 && vg < 2 && vb > -3 && vb < 2
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) {
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bytes[p++] = QOI_DIFF_8 | ((vr + 1) << 4) | (vg + 1) << 2 | (vb + 1);
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bytes[p++] = QOI_DIFF_8 | ((vr + 2) << 4) | (vg + 2) << 2 | (vb + 2);
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}
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else if (
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va == 0 && vr > -16 && vr < 17 &&
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vg > -8 && vg < 9 && vb > -8 && vb < 9
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va == 0 && vr > -17 && vr < 16 &&
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vg > -9 && vg < 8 && vb > -9 && vb < 8
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) {
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bytes[p++] = QOI_DIFF_16 | (vr + 15);
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bytes[p++] = ((vg + 7) << 4) | (vb + 7);
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bytes[p++] = QOI_DIFF_16 | (vr + 16);
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bytes[p++] = ((vg + 8) << 4) | (vb + 8);
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}
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else {
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bytes[p++] = QOI_DIFF_24 | ((vr + 15) >> 1);
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bytes[p++] = ((vr + 15) << 7) | ((vg + 15) << 2) | ((vb + 15) >> 3);
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bytes[p++] = ((vb + 15) << 5) | (va + 15);
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bytes[p++] = QOI_DIFF_24 | ((vr + 16) >> 1);
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bytes[p++] = ((vr + 16) << 7) | ((vg + 16) << 2) | ((vb + 16) >> 3);
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bytes[p++] = ((vb + 16) << 5) | (va + 16);
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}
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}
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else {
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@ -380,35 +418,41 @@ void *qoi_encode(const void *data, int w, int h, int channels, int *out_len) {
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bytes[p++] = 0;
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}
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int data_len = p - QOI_HEADER_SIZE;
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*out_len = p;
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p = 8;
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qoi_write_32(bytes, &p, data_len);
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return bytes;
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}
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void *qoi_decode(const void *data, int size, int *out_w, int *out_h, int channels) {
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if (channels < 3 || channels > 4 || size < QOI_HEADER_SIZE) {
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void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels) {
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if (
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data == NULL || desc == NULL ||
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(channels != 0 && channels != 3 && channels != 4) ||
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size < QOI_HEADER_SIZE + QOI_PADDING
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) {
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return NULL;
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}
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const unsigned char *bytes = (const unsigned char *)data;
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int p = 0;
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int magic = qoi_read_32(bytes, &p);
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int w = qoi_read_16(bytes, &p);
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int h = qoi_read_16(bytes, &p);
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int data_len = qoi_read_32(bytes, &p);
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unsigned int header_magic = qoi_read_32(bytes, &p);
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desc->width = qoi_read_32(bytes, &p);
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desc->height = qoi_read_32(bytes, &p);
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desc->channels = bytes[p++];
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desc->colorspace = bytes[p++];
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if (
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w == 0 || h == 0 || magic != QOI_MAGIC ||
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size != data_len + QOI_HEADER_SIZE
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desc->width == 0 || desc->height == 0 ||
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desc->channels < 3 || desc->channels > 4 ||
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header_magic != QOI_MAGIC
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) {
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return NULL;
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}
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int px_len = w * h * channels;
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if (channels == 0) {
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channels = desc->channels;
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}
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int px_len = desc->width * desc->height * channels;
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unsigned char *pixels = QOI_MALLOC(px_len);
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if (!pixels) {
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return NULL;
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@ -437,23 +481,23 @@ void *qoi_decode(const void *data, int size, int *out_w, int *out_h, int channel
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run = (((b1 & 0x1f) << 8) | (b2)) + 32;
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}
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else if ((b1 & QOI_MASK_2) == QOI_DIFF_8) {
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px.rgba.r += ((b1 >> 4) & 0x03) - 1;
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px.rgba.g += ((b1 >> 2) & 0x03) - 1;
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px.rgba.b += ( b1 & 0x03) - 1;
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px.rgba.r += ((b1 >> 4) & 0x03) - 2;
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px.rgba.g += ((b1 >> 2) & 0x03) - 2;
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px.rgba.b += ( b1 & 0x03) - 2;
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}
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else if ((b1 & QOI_MASK_3) == QOI_DIFF_16) {
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int b2 = bytes[p++];
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px.rgba.r += (b1 & 0x1f) - 15;
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px.rgba.g += (b2 >> 4) - 7;
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px.rgba.b += (b2 & 0x0f) - 7;
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px.rgba.r += (b1 & 0x1f) - 16;
|
||||
px.rgba.g += (b2 >> 4) - 8;
|
||||
px.rgba.b += (b2 & 0x0f) - 8;
|
||||
}
|
||||
else if ((b1 & QOI_MASK_4) == QOI_DIFF_24) {
|
||||
int b2 = bytes[p++];
|
||||
int b3 = bytes[p++];
|
||||
px.rgba.r += (((b1 & 0x0f) << 1) | (b2 >> 7)) - 15;
|
||||
px.rgba.g += ((b2 & 0x7c) >> 2) - 15;
|
||||
px.rgba.b += (((b2 & 0x03) << 3) | ((b3 & 0xe0) >> 5)) - 15;
|
||||
px.rgba.a += (b3 & 0x1f) - 15;
|
||||
px.rgba.r += (((b1 & 0x0f) << 1) | (b2 >> 7)) - 16;
|
||||
px.rgba.g += ((b2 & 0x7c) >> 2) - 16;
|
||||
px.rgba.b += (((b2 & 0x03) << 3) | ((b3 & 0xe0) >> 5)) - 16;
|
||||
px.rgba.a += (b3 & 0x1f) - 16;
|
||||
}
|
||||
else if ((b1 & QOI_MASK_4) == QOI_COLOR) {
|
||||
if (b1 & 8) { px.rgba.r = bytes[p++]; }
|
||||
|
|
@ -475,17 +519,15 @@ void *qoi_decode(const void *data, int size, int *out_w, int *out_h, int channel
|
|||
}
|
||||
}
|
||||
|
||||
*out_w = w;
|
||||
*out_h = h;
|
||||
return pixels;
|
||||
}
|
||||
|
||||
#ifndef QOI_NO_STDIO
|
||||
#include <stdio.h>
|
||||
|
||||
int qoi_write(const char *filename, const void *data, int w, int h, int channels) {
|
||||
int qoi_write(const char *filename, const void *data, const qoi_desc *desc) {
|
||||
int size;
|
||||
void *encoded = qoi_encode(data, w, h, channels, &size);
|
||||
void *encoded = qoi_encode(data, desc, &size);
|
||||
if (!encoded) {
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -502,7 +544,7 @@ int qoi_write(const char *filename, const void *data, int w, int h, int channels
|
|||
return size;
|
||||
}
|
||||
|
||||
void *qoi_read(const char *filename, int *out_w, int *out_h, int channels) {
|
||||
void *qoi_read(const char *filename, qoi_desc *desc, int channels) {
|
||||
FILE *f = fopen(filename, "rb");
|
||||
if (!f) {
|
||||
return NULL;
|
||||
|
|
@ -514,13 +556,14 @@ void *qoi_read(const char *filename, int *out_w, int *out_h, int channels) {
|
|||
|
||||
void *data = QOI_MALLOC(size);
|
||||
if (!data) {
|
||||
fclose(f);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int bytes_read = fread(data, 1, size, f);
|
||||
fclose(f);
|
||||
|
||||
void *pixels = qoi_decode(data, bytes_read, out_w, out_h, channels);
|
||||
void *pixels = qoi_decode(data, bytes_read, desc, channels);
|
||||
QOI_FREE(data);
|
||||
return pixels;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -375,7 +375,10 @@ Image LoadImageFromMemory(const char *fileType, const unsigned char *fileData, i
|
|||
#if defined(SUPPORT_FILEFORMAT_QOI)
|
||||
else if (TextIsEqual(fileExtLower, ".qoi"))
|
||||
{
|
||||
image.data = qoi_decode(fileData, dataSize, &image.width, &image.height, 4);
|
||||
qoi_desc desc = { 0 };
|
||||
image.data = qoi_decode(fileData, dataSize, &desc, 4);
|
||||
image.width = desc.width;
|
||||
image.height = desc.height;
|
||||
image.format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;
|
||||
image.mipmaps = 1;
|
||||
}
|
||||
|
|
@ -505,7 +508,16 @@ bool ExportImage(Image image, const char *fileName)
|
|||
else if (image.format == PIXELFORMAT_UNCOMPRESSED_R8G8B8A8) channels = 4;
|
||||
else TRACELOG(LOG_WARNING, "IMAGE: Image pixel format must be R8G8B8 or R8G8B8A8");
|
||||
|
||||
if ((channels == 3) || (channels == 4)) success = qoi_write(fileName, imgData, image.width, image.height, channels);
|
||||
if ((channels == 3) || (channels == 4))
|
||||
{
|
||||
qoi_desc desc = { 0 };
|
||||
desc.width = image.width;
|
||||
desc.height = image.height;
|
||||
desc.channels = channels;
|
||||
desc.colorspace = QOI_SRGB;
|
||||
|
||||
success = qoi_write(fileName, imgData, &desc);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
#if defined(SUPPORT_FILEFORMAT_KTX)
|
||||
|
|
|
|||
Loading…
Reference in New Issue