mirror of
https://github.com/Nexoniarz/YAPF.git
synced 2026-11-02 20:44:27 +00:00
d7f494a0c9
- yapf_encode() / yapf_free_buffer(): encode to memory; yapf_save uses it - yapf.c also compiles as C++ - `yapf compare`: size and decode speed of the original format vs YAPF, with a lossless check - bindings with tested examples: C++ (header-only), C# (P/Invoke), Rust (crate, builds the C code), Go (cgo), Java (FFM API, Java 22+), Zig (@cImport), LuaJIT (FFI), TypeScript types for the JS port; Python now encodes in memory - docs/LANGUAGES.md and examples/ with measured results - KDE Dolphin thumbnail plugin (KF6, CMake) - README: honest status for Photoshop / VS Code / Figma (not run in the apps yet) and macOS (cross-compiled only), platform table Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
111 lines
3.2 KiB
Go
111 lines
3.2 KiB
Go
// Package yapf reads and writes YAPF lossless images (cgo bindings to the C library).
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//
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// img, err := yapf.Load("texture.yapf")
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// data, err := yapf.Encode(&yapf.Image{Width: 256, Height: 256, Channels: 4, Pixels: rgba})
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package yapf
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/*
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#cgo CFLAGS: -O2 -std=c99 -I${SRCDIR}/../..
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#cgo !windows LDFLAGS: -lm -lpthread
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#include <stdlib.h>
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#include "yapf.h"
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*/
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import "C"
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import (
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"errors"
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"os"
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"unsafe"
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)
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const (
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FlagPremultAlpha = 1
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FlagSRGB = 2
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)
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var ErrInvalid = errors.New("yapf: not a valid YAPF file")
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// Image holds Width*Height*Channels bytes in Pixels, rows top to bottom.
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// Channels: 1 gray, 2 gray+alpha, 3 RGB, 4 RGBA. Mips holds the smaller
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// mip levels (1, 2, …), if any.
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type Image struct {
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Width, Height int
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Channels int
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Flags uint8
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GPUFormat uint8
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Pixels []byte
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Mips [][]byte
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}
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// Decode decodes YAPF bytes on the calling thread; DecodeThreads(data, 0) uses every core.
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func Decode(data []byte) (*Image, error) { return DecodeThreads(data, 1) }
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func DecodeThreads(data []byte, threads int) (*Image, error) {
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if len(data) == 0 {
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return nil, ErrInvalid
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}
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p := C.yapf_load_memory_mt(unsafe.Pointer(&data[0]), C.size_t(len(data)), C.int(threads))
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if p == nil {
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return nil, ErrInvalid
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}
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defer C.yapf_free(p)
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img := &Image{Width: int(p.width), Height: int(p.height), Channels: int(p.channels),
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Flags: uint8(p.flags), GPUFormat: uint8(p.gpu_format)}
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mips := unsafe.Slice(p.mips, int(p.mip_levels))
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for m := range mips {
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w, h := max(1, img.Width>>m), max(1, img.Height>>m)
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level := C.GoBytes(unsafe.Pointer(mips[m]), C.int(w*h*img.Channels))
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if m == 0 {
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img.Pixels = level
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} else {
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img.Mips = append(img.Mips, level)
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}
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}
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return img, nil
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}
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func Load(path string) (*Image, error) {
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data, err := os.ReadFile(path)
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if err != nil {
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return nil, err
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}
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return Decode(data)
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}
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// Encode returns the bytes of a .yapf file.
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func Encode(img *Image) ([]byte, error) {
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if img.Channels < 1 || img.Channels > 4 || len(img.Pixels) != img.Width*img.Height*img.Channels {
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return nil, errors.New("yapf: pixels must hold Width*Height*Channels bytes")
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}
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// Copy the levels into C memory: cgo forbids passing Go pointers inside C structs.
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levels := append([][]byte{img.Pixels}, img.Mips...)
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table := (**C.uint8_t)(C.malloc(C.size_t(len(levels)) * C.size_t(unsafe.Sizeof(uintptr(0)))))
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defer C.free(unsafe.Pointer(table))
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ptrs := unsafe.Slice(table, len(levels))
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for i, l := range levels {
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ptrs[i] = (*C.uint8_t)(C.CBytes(l))
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defer C.free(unsafe.Pointer(ptrs[i]))
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}
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gpu := img.GPUFormat
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if gpu == 0 {
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gpu = map[int]uint8{4: 4, 3: 5, 2: 2, 1: 3}[img.Channels]
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}
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raw := C.yapf_image_t{width: C.uint32_t(img.Width), height: C.uint32_t(img.Height),
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channels: C.uint8_t(img.Channels), gpu_format: C.uint8_t(gpu), flags: C.uint8_t(img.Flags),
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mip_levels: C.uint8_t(len(levels)), pixels: ptrs[0], mips: table}
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var data unsafe.Pointer
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var size C.size_t
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if rc := C.yapf_encode(&raw, &data, &size); rc != 0 {
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return nil, errors.New("yapf: encoding failed")
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}
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defer C.yapf_free_buffer(data)
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return C.GoBytes(data, C.int(size)), nil
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}
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func Save(path string, img *Image) error {
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data, err := Encode(img)
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if err != nil {
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return err
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}
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return os.WriteFile(path, data, 0o644)
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}
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