webpx 0.1.4

Complete WebP encoding/decoding with ICC profiles, streaming, and animation support
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218

//! Demonstration of the encoding API - "one right way" per input format.
//!
//! This example shows the recommended encoding path for each input format.
//!
//! Run with: cargo run --example pixel_api_demo --features "encode animation"
//!
//! ## Quick Reference
//!
//! | Input Format        | Recommended Method                           | Zero-copy? |
//! |---------------------|----------------------------------------------|------------|
//! | `&[u32]` ARGB       | `Encoder::new_argb(data, w, h).encode()`     | ✅ Yes     |
//! | `YuvPlanesRef`      | `Encoder::new_yuv(planes).encode()`          | ✅ Yes     |
//! | `&[u8]` RGBA        | `Encoder::new_rgba(data, w, h).encode()`     | ❌ No      |
//! | `&[u8]` RGB         | `Encoder::new_rgb(data, w, h).encode()`      | ❌ No      |
//! | `&[u8]` BGRA        | `Encoder::new_bgra(data, w, h).encode()`     | ❌ No      |
//! | `&[u8]` BGR         | `Encoder::new_bgr(data, w, h).encode()`      | ❌ No      |
//! | `&[RGBA8]` etc      | `Encoder::from_pixels(pixels, w, h).encode()`| ❌ No      |
//! | `ImgRef<RGBA8>` etc | `Encoder::from_img(img).encode()`            | ❌ No      |
//!
//! For reusable config across multiple images, use `EncoderConfig`:
//! - `config.encode_rgba(data, w, h, stop)` for raw bytes
//! - `config.encode(pixels, w, h, stop)` for typed pixels
//! - `config.encode_img(img, stop)` for imgref

use rgb::alt::BGRA8;
use rgb::{RGB8, RGBA8};
use webpx::{AnimationEncoder, Encoder, EncoderConfig, Unstoppable};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("=== STILL IMAGE ENCODING ===\n");

    // =========================================================================
    // RAW BYTES - use explicit format methods
    // =========================================================================

    println!("--- Raw &[u8] bytes ---");

    // RGBA bytes
    let rgba_bytes: Vec<u8> = [255, 0, 0, 255].repeat(100 * 100);
    let webp = Encoder::new_rgba(&rgba_bytes, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::new_rgba: {} bytes", webp.len());

    // RGB bytes (no alpha)
    let rgb_bytes: Vec<u8> = [255, 0, 0].repeat(100 * 100);
    let webp = Encoder::new_rgb(&rgb_bytes, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::new_rgb: {} bytes", webp.len());

    // BGRA bytes (Windows/GPU native)
    let bgra_bytes: Vec<u8> = [0, 0, 255, 255].repeat(100 * 100); // Blue in BGRA
    let webp = Encoder::new_bgra(&bgra_bytes, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::new_bgra: {} bytes", webp.len());

    // BGR bytes (OpenCV)
    let bgr_bytes: Vec<u8> = [0, 0, 255].repeat(100 * 100);
    let webp = Encoder::new_bgr(&bgr_bytes, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::new_bgr: {} bytes", webp.len());

    // =========================================================================
    // ZERO-COPY FAST PATHS - data passed directly to libwebp without copying
    // =========================================================================

    println!("\n--- Zero-copy fast paths ---");

    // ARGB as u32 (native libwebp format, zero-copy)
    // Format: 0xAARRGGBB (alpha in high byte)
    let red_argb: u32 = 0xFF_FF_00_00; // alpha=255, red=255, green=0, blue=0
    let argb_data: Vec<u32> = vec![red_argb; 100 * 100];
    let webp = Encoder::new_argb(&argb_data, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::new_argb (zero-copy): {} bytes", webp.len());

    // YUV planes are also zero-copy (shown later with YuvPlanesRef)

    // =========================================================================
    // TYPED PIXELS - format inferred from type
    // =========================================================================

    println!("\n--- Typed &[P] pixels ---");

    // Vec<RGBA8>
    let rgba_pixels: Vec<RGBA8> = vec![RGBA8::new(255, 0, 0, 255); 100 * 100];
    let webp = Encoder::from_pixels(&rgba_pixels, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::from_pixels (RGBA8): {} bytes", webp.len());

    // Vec<RGB8>
    let rgb_pixels: Vec<RGB8> = vec![RGB8::new(0, 255, 0); 100 * 100];
    let webp = Encoder::from_pixels(&rgb_pixels, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::from_pixels (RGB8): {} bytes", webp.len());

    // Vec<BGRA8>
    let bgra_pixels: Vec<BGRA8> = vec![
        BGRA8 {
            b: 0,
            g: 0,
            r: 255,
            a: 255
        };
        100 * 100
    ];
    let webp = Encoder::from_pixels(&bgra_pixels, 100, 100)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::from_pixels (BGRA8): {} bytes", webp.len());

    // =========================================================================
    // IMGREF - format inferred from type, stride handled automatically
    // =========================================================================

    println!("\n--- imgref::ImgRef<P> ---");

    // Contiguous imgref
    let pixels: Vec<RGBA8> = vec![RGBA8::new(0, 0, 255, 255); 100 * 100];
    let img = imgref::Img::new(pixels.as_slice(), 100, 100);
    let webp = Encoder::from_img(img).quality(85.0).encode(Unstoppable)?;
    println!("  Encoder::from_img (contiguous): {} bytes", webp.len());

    // imgref with stride (e.g., cropped region)
    let padded: Vec<RGBA8> = vec![RGBA8::new(128, 128, 128, 255); 128 * 100];
    let img_with_stride = imgref::Img::new_stride(padded.as_slice(), 100, 100, 128);
    let webp = Encoder::from_img(img_with_stride)
        .quality(85.0)
        .encode(Unstoppable)?;
    println!("  Encoder::from_img (with stride): {} bytes", webp.len());

    // =========================================================================
    // REUSABLE CONFIG - for encoding multiple images
    // =========================================================================

    println!("\n--- EncoderConfig (reusable) ---");

    let config = EncoderConfig::new().quality(90.0).method(6);

    // With raw bytes
    let webp1 = config.encode_rgba(&rgba_bytes, 100, 100, Unstoppable)?;
    println!("  config.encode_rgba: {} bytes", webp1.len());

    // With typed pixels
    let webp2 = config.encode(&rgba_pixels, 100, 100, Unstoppable)?;
    println!("  config.encode (typed): {} bytes", webp2.len());

    // With imgref
    let img = imgref::Img::new(rgba_pixels.as_slice(), 100, 100);
    let webp3 = config.encode_img(img, Unstoppable)?;
    println!("  config.encode_img: {} bytes", webp3.len());

    // =========================================================================
    // ANIMATION
    // =========================================================================

    println!("\n=== ANIMATION ENCODING ===\n");

    // Typed pixels - format inferred
    println!("--- AnimationEncoder with typed pixels ---");
    let frame1: Vec<RGBA8> = vec![RGBA8::new(255, 0, 0, 255); 64 * 64];
    let frame2: Vec<RGBA8> = vec![RGBA8::new(0, 255, 0, 255); 64 * 64];
    let frame3: Vec<RGBA8> = vec![RGBA8::new(0, 0, 255, 255); 64 * 64];

    let mut encoder = AnimationEncoder::new(64, 64)?;
    encoder.set_quality(80.0);
    encoder.add_frame(&frame1, 0)?;
    encoder.add_frame(&frame2, 100)?;
    encoder.add_frame(&frame3, 200)?;
    let webp = encoder.finish(300)?;
    println!("  add_frame (RGBA8): {} bytes, 3 frames", webp.len());

    // Raw bytes - explicit format
    println!("\n--- AnimationEncoder with raw bytes ---");
    let raw1: Vec<u8> = vec![255; 64 * 64 * 4];
    let raw2: Vec<u8> = vec![128; 64 * 64 * 4];

    let mut encoder = AnimationEncoder::new(64, 64)?;
    encoder.add_frame_rgba(&raw1, 0)?;
    encoder.add_frame_rgba(&raw2, 100)?;
    let webp = encoder.finish(200)?;
    println!("  add_frame_rgba: {} bytes, 2 frames", webp.len());

    println!("\n=== SUMMARY ===");
    println!(
        "
The 'one right way' for each input format:

  ZERO-COPY (fastest):
    &[u32] ARGB (0xAARRGGBB) →  Encoder::new_argb()
    YuvPlanesRef             →  Encoder::new_yuv()

  WITH COPY (convenient):
    &[u8] with known format  →  Encoder::new_rgba/rgb/bgra/bgr()
    &[P] typed pixels        →  Encoder::from_pixels()
    ImgRef<P>                →  Encoder::from_img()

For reusable config:

  &[u8]       →  config.encode_rgba/rgb/bgra/bgr()
  &[P]        →  config.encode()
  ImgRef<P>   →  config.encode_img()

For animation:

  &[P]        →  encoder.add_frame()
  &[u8]       →  encoder.add_frame_rgba/rgb/bgra/bgr()
"
    );

    Ok(())
}