ppt_rs/generator/
images.rs

1//! Image handling for PPTX presentations
2//!
3//! Handles image metadata, embedding, and XML generation
4
5use std::path::Path;
6use crate::core::{Positioned, ElementSized, Dimension};
7
8/// Normalize format string and derive file extension
9fn format_and_ext(format: &str) -> (String, String) {
10    let upper = format.to_uppercase();
11    let ext = match upper.as_str() {
12        "JPEG" => "jpg".to_string(),
13        _ => upper.to_lowercase(),
14    };
15    (upper, ext)
16}
17
18/// Generate a unique image filename from format string
19fn generate_image_filename(format: &str) -> (String, String) {
20    let (upper, ext) = format_and_ext(format);
21    let filename = format!("image_{}.{}", uuid::Uuid::new_v4(), ext);
22    (filename, upper)
23}
24
25/// Image data source
26#[derive(Clone, Debug)]
27pub enum ImageSource {
28    /// Load from file path
29    File(String),
30    /// Base64 encoded data
31    Base64(String),
32    /// Raw bytes
33    Bytes(Vec<u8>),
34    /// Load from URL
35    #[cfg(feature = "web2ppt")]
36    Url(String),
37}
38
39/// Image crop configuration (values 0.0 to 1.0)
40#[derive(Clone, Debug, Default)]
41pub struct Crop {
42    pub left: f64,
43    pub top: f64,
44    pub right: f64,
45    pub bottom: f64,
46}
47
48impl Crop {
49    /// Create a new crop configuration
50    pub fn new(left: f64, top: f64, right: f64, bottom: f64) -> Self {
51        Self { left, top, right, bottom }
52    }
53}
54
55/// Image effects
56#[derive(Clone, Debug)]
57pub enum ImageEffect {
58    /// Outer shadow
59    Shadow,
60    /// Reflection
61    Reflection,
62    /// Glow effect
63    Glow,
64    /// Soft edges
65    SoftEdges,
66    /// Inner shadow
67    InnerShadow,
68    /// Blur effect
69    Blur,
70}
71
72/// Image metadata and properties
73#[derive(Clone, Debug)]
74pub struct Image {
75    pub filename: String,
76    pub width: u32,      // in EMU
77    pub height: u32,     // in EMU
78    pub x: u32,          // Position X in EMU
79    pub y: u32,          // Position Y in EMU
80    pub format: String,  // PNG, JPG, GIF, etc.
81    /// Image data source (file path, base64, or bytes)
82    pub source: Option<ImageSource>,
83    /// Image cropping
84    pub crop: Option<Crop>,
85    /// Image effects
86    pub effects: Vec<ImageEffect>,
87}
88
89impl Image {
90    /// Create a new image
91    pub fn new(filename: &str, width: u32, height: u32, format: &str) -> Self {
92        Image {
93            filename: filename.to_string(),
94            width,
95            height,
96            x: 0,
97            y: 0,
98            format: format.to_uppercase(),
99            source: Some(ImageSource::File(filename.to_string())),
100            crop: None,
101            effects: Vec::new(),
102        }
103    }
104
105    /// Create an image from a file path, automatically detecting dimensions
106    pub fn from_path<P: AsRef<Path>>(path: P) -> std::result::Result<Self, String> {
107        let path = path.as_ref();
108        let filename = path.file_name().map(|s| s.to_string_lossy().to_string()).unwrap_or_else(|| "image.png".to_string());
109        let path_str = path.to_string_lossy().to_string();
110        
111        let data = std::fs::read(path)
112            .map_err(|e| format!("Failed to open image: {e}"))?;
113        let (w, h, format) = read_image_dimensions(&data)
114            .ok_or_else(|| "Failed to detect image dimensions (unsupported format)".to_string())?;
115            
116        // Convert pixels to EMU (assuming 96 DPI): 1 pixel = 9525 EMU
117        let w_emu = w * 9525;
118        let h_emu = h * 9525;
119        
120        Ok(Image {
121            filename,
122            width: w_emu,
123            height: h_emu,
124            x: 0,
125            y: 0,
126            format,
127            source: Some(ImageSource::File(path_str)),
128            crop: None,
129            effects: Vec::new(),
130        })
131    }
132    
133    /// Create an image from base64 encoded data
134    ///
135    /// # Example
136    /// ```rust
137    /// use ppt_rs::generator::Image;
138    ///
139    /// let base64_data = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==";
140    /// let img = Image::from_base64(base64_data, 100, 100, "PNG")
141    ///     .position(1000000, 1000000);
142    ///
143    /// assert_eq!(img.width, 100);
144    /// assert_eq!(img.height, 100);
145    /// assert_eq!(img.format, "PNG");
146    /// ```
147    pub fn from_base64(data: &str, width: u32, height: u32, format: &str) -> Self {
148        let (filename, fmt) = generate_image_filename(format);
149        Self::with_source(filename, width, height, fmt, ImageSource::Base64(data.to_string()))
150    }
151    
152    /// Create an image from raw bytes
153    pub fn from_bytes(data: Vec<u8>, width: u32, height: u32, format: &str) -> Self {
154        let (filename, fmt) = generate_image_filename(format);
155        Self::with_source(filename, width, height, fmt, ImageSource::Bytes(data))
156    }
157
158    /// Create an image from URL
159    #[cfg(feature = "web2ppt")]
160    pub fn from_url(url: &str, width: u32, height: u32, format: &str) -> Self {
161        let (filename, fmt) = generate_image_filename(format);
162        Self::with_source(filename, width, height, fmt, ImageSource::Url(url.to_string()))
163    }
164
165    /// Internal constructor to avoid repeating struct init
166    fn with_source(filename: String, width: u32, height: u32, format: String, source: ImageSource) -> Self {
167        Image {
168            filename,
169            width,
170            height,
171            x: 0,
172            y: 0,
173            format,
174            source: Some(source),
175            crop: None,
176            effects: Vec::new(),
177        }
178    }
179    
180    /// Get the image data as bytes (decodes base64 if needed)
181    pub fn get_bytes(&self) -> Option<Vec<u8>> {
182        match &self.source {
183            Some(ImageSource::Base64(data)) => {
184                // Decode base64
185                base64_decode(data).ok()
186            }
187            Some(ImageSource::Bytes(data)) => Some(data.clone()),
188            Some(ImageSource::File(path)) => {
189                std::fs::read(path).ok()
190            }
191            #[cfg(feature = "web2ppt")]
192            Some(ImageSource::Url(url)) => {
193                // Use blocking client to fetch image
194                // Set User-Agent to mimic browser to avoid some 403s
195                let client = reqwest::blocking::Client::builder()
196                    .user_agent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")
197                    .build()
198                    .ok()?;
199                    
200                match client.get(url).send() {
201                    Ok(resp) => {
202                        if resp.status().is_success() {
203                            resp.bytes().ok().map(|b| b.to_vec())
204                        } else {
205                            None
206                        }
207                    },
208                    Err(_) => None,
209                }
210            }
211            None => None,
212        }
213    }
214
215    /// Set image position
216    pub fn position(mut self, x: u32, y: u32) -> Self {
217        self.x = x;
218        self.y = y;
219        self
220    }
221
222    /// Set image cropping
223    pub fn with_crop(mut self, left: f64, top: f64, right: f64, bottom: f64) -> Self {
224        self.crop = Some(Crop::new(left, top, right, bottom));
225        self
226    }
227
228    /// Add an image effect
229    pub fn with_effect(mut self, effect: ImageEffect) -> Self {
230        self.effects.push(effect);
231        self
232    }
233
234    /// Get aspect ratio
235    pub fn aspect_ratio(&self) -> f64 {
236        self.width as f64 / self.height as f64
237    }
238
239    /// Scale image to width while maintaining aspect ratio
240    pub fn scale_to_width(mut self, width: u32) -> Self {
241        let ratio = self.aspect_ratio();
242        self.width = width;
243        self.height = (width as f64 / ratio) as u32;
244        self
245    }
246
247    /// Scale image to height while maintaining aspect ratio
248    pub fn scale_to_height(mut self, height: u32) -> Self {
249        let ratio = self.aspect_ratio();
250        self.height = height;
251        self.width = (height as f64 * ratio) as u32;
252        self
253    }
254
255    /// Get file extension from filename
256    pub fn extension(&self) -> String {
257        Path::new(&self.filename)
258            .extension()
259            .and_then(|ext| ext.to_str())
260            .map(|s| s.to_lowercase())
261            .unwrap_or_else(|| self.format.to_lowercase())
262    }
263
264    /// Get MIME type for the image format
265    pub fn mime_type(&self) -> String {
266        match self.format.as_str() {
267            "PNG" => "image/png".to_string(),
268            "JPG" | "JPEG" => "image/jpeg".to_string(),
269            "GIF" => "image/gif".to_string(),
270            "BMP" => "image/bmp".to_string(),
271            "TIFF" => "image/tiff".to_string(),
272            "SVG" => "image/svg+xml".to_string(),
273            _ => "application/octet-stream".to_string(),
274        }
275    }
276
277    /// Set position using flexible Dimension units (fluent).
278    pub fn at(mut self, x: Dimension, y: Dimension) -> Self {
279        self.x = x.to_emu_x();
280        self.y = y.to_emu_y();
281        self
282    }
283
284    /// Set size using flexible Dimension units (fluent).
285    pub fn with_dimensions(mut self, width: Dimension, height: Dimension) -> Self {
286        self.width = width.to_emu_x();
287        self.height = height.to_emu_y();
288        self
289    }
290}
291
292impl Positioned for Image {
293    fn x(&self) -> u32 { self.x }
294    fn y(&self) -> u32 { self.y }
295    fn set_position(&mut self, x: u32, y: u32) {
296        self.x = x;
297        self.y = y;
298    }
299}
300
301impl ElementSized for Image {
302    fn width(&self) -> u32 { self.width }
303    fn height(&self) -> u32 { self.height }
304    fn set_size(&mut self, width: u32, height: u32) {
305        self.width = width;
306        self.height = height;
307    }
308}
309
310/// Decode base64 string to bytes
311fn base64_decode(input: &str) -> Result<Vec<u8>, std::io::Error> {
312    // Simple base64 decoder
313    const DECODE_TABLE: [i8; 128] = [
314        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
315        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
316        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
317        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
318        -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
319        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
320        -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
321        41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
322    ];
323    
324    let input = input.trim().replace(['\n', '\r', ' '], "");
325    let mut output = Vec::with_capacity(input.len() * 3 / 4);
326    let bytes: Vec<u8> = input.bytes().collect();
327    
328    let mut i = 0;
329    while i < bytes.len() {
330        let mut buf = [0u8; 4];
331        let mut pad = 0;
332        
333        for j in 0..4 {
334            if i + j >= bytes.len() || bytes[i + j] == b'=' {
335                buf[j] = 0;
336                pad += 1;
337            } else if bytes[i + j] < 128 && DECODE_TABLE[bytes[i + j] as usize] >= 0 {
338                buf[j] = DECODE_TABLE[bytes[i + j] as usize] as u8;
339            } else {
340                return Err(std::io::Error::new(
341                    std::io::ErrorKind::InvalidData,
342                    "Invalid base64 character",
343                ));
344            }
345        }
346        
347        output.push((buf[0] << 2) | (buf[1] >> 4));
348        if pad < 2 {
349            output.push((buf[1] << 4) | (buf[2] >> 2));
350        }
351        if pad < 1 {
352            output.push((buf[2] << 6) | buf[3]);
353        }
354        
355        i += 4;
356    }
357    
358    Ok(output)
359}
360
361/// Image builder for fluent API
362pub struct ImageBuilder {
363    filename: String,
364    width: u32,
365    height: u32,
366    x: u32,
367    y: u32,
368    format: String,
369    source: Option<ImageSource>,
370    effects: Vec<ImageEffect>,
371    crop: Option<Crop>,
372}
373
374impl ImageBuilder {
375    /// Create a new image builder from file
376    pub fn new(filename: &str, width: u32, height: u32) -> Self {
377        let format = Path::new(filename)
378            .extension()
379            .and_then(|ext| ext.to_str())
380            .map(|s| s.to_uppercase())
381            .unwrap_or_else(|| "PNG".to_string());
382
383        ImageBuilder {
384            filename: filename.to_string(),
385            width,
386            height,
387            x: 0,
388            y: 0,
389            format,
390            source: Some(ImageSource::File(filename.to_string())),
391            effects: Vec::new(),
392            crop: None,
393        }
394    }
395    
396    /// Create image from file with default size (2 inches square)
397    /// 
398    /// # Example
399    /// ```
400    /// use ppt_rs::generator::ImageBuilder;
401    /// 
402    /// let img = ImageBuilder::from_file("photo.jpg").build();
403    /// ```
404    pub fn from_file(filename: &str) -> Self {
405        const DEFAULT_SIZE: u32 = 1828800; // 2 inches in EMU
406        Self::new(filename, DEFAULT_SIZE, DEFAULT_SIZE)
407    }
408    
409    /// Create image builder from base64 data
410    pub fn from_base64(data: &str, width: u32, height: u32, format: &str) -> Self {
411        let (upper, ext) = format_and_ext(format);
412        ImageBuilder {
413            filename: format!("image.{}", ext),
414            width, height, x: 0, y: 0,
415            format: upper,
416            source: Some(ImageSource::Base64(data.to_string())),
417            effects: Vec::new(),
418            crop: None,
419        }
420    }
421    
422    /// Create image from base64 with default size (2 inches square)
423    /// 
424    /// # Example
425    /// ```
426    /// use ppt_rs::generator::ImageBuilder;
427    /// 
428    /// let img = ImageBuilder::base64("iVBORw0KG...", "PNG").build();
429    /// ```
430    pub fn base64(data: &str, format: &str) -> Self {
431        const DEFAULT_SIZE: u32 = 1828800; // 2 inches in EMU
432        Self::from_base64(data, DEFAULT_SIZE, DEFAULT_SIZE, format)
433    }
434    
435    /// Create image builder from bytes
436    pub fn from_bytes(data: Vec<u8>, width: u32, height: u32, format: &str) -> Self {
437        let (upper, ext) = format_and_ext(format);
438        ImageBuilder {
439            filename: format!("image.{}", ext),
440            width, height, x: 0, y: 0,
441            format: upper,
442            source: Some(ImageSource::Bytes(data)),
443            effects: Vec::new(),
444            crop: None,
445        }
446    }
447    
448    /// Create image from bytes with default size (2 inches square)
449    /// 
450    /// # Example
451    /// ```no_run
452    /// use ppt_rs::generator::ImageBuilder;
453    /// 
454    /// let bytes = std::fs::read("photo.jpg").unwrap();
455    /// let img = ImageBuilder::bytes(bytes, "JPEG").build();
456    /// ```
457    pub fn bytes(data: Vec<u8>, format: &str) -> Self {
458        const DEFAULT_SIZE: u32 = 1828800; // 2 inches in EMU
459        Self::from_bytes(data, DEFAULT_SIZE, DEFAULT_SIZE, format)
460    }
461    
462    /// Auto-detect format from bytes and create image with default size
463    /// 
464    /// # Example
465    /// ```no_run
466    /// use ppt_rs::generator::ImageBuilder;
467    /// 
468    /// let bytes = std::fs::read("photo.jpg").unwrap();
469    /// let img = ImageBuilder::auto(bytes).build();
470    /// ```
471    pub fn auto(data: Vec<u8>) -> Self {
472        const DEFAULT_SIZE: u32 = 1828800; // 2 inches in EMU
473        
474        // Detect format from magic bytes
475        let format = if data.len() >= 4 {
476            if &data[0..4] == b"\x89PNG" {
477                "PNG"
478            } else if data.len() >= 2 && &data[0..2] == b"\xFF\xD8" {
479                "JPEG"
480            } else if data.len() >= 6 && &data[0..6] == b"GIF89a" || &data[0..6] == b"GIF87a" {
481                "GIF"
482            } else {
483                "PNG" // default
484            }
485        } else {
486            "PNG"
487        };
488        
489        Self::from_bytes(data, DEFAULT_SIZE, DEFAULT_SIZE, format)
490    }
491
492    /// Set image position
493    pub fn position(mut self, x: u32, y: u32) -> Self {
494        self.x = x;
495        self.y = y;
496        self
497    }
498    
499    /// Set image position at (x, y) - alias for position()
500    pub fn at(self, x: u32, y: u32) -> Self {
501        self.position(x, y)
502    }
503    
504    /// Set image size
505    pub fn size(mut self, width: u32, height: u32) -> Self {
506        self.width = width;
507        self.height = height;
508        self
509    }
510
511    /// Set image format
512    pub fn format(mut self, format: &str) -> Self {
513        self.format = format.to_uppercase();
514        self
515    }
516
517    /// Scale to width (maintains aspect ratio)
518    pub fn scale_to_width(mut self, width: u32) -> Self {
519        let ratio = self.width as f64 / self.height as f64;
520        self.width = width;
521        self.height = (width as f64 / ratio) as u32;
522        self
523    }
524
525    /// Scale to height (maintains aspect ratio)
526    pub fn scale_to_height(mut self, height: u32) -> Self {
527        let ratio = self.width as f64 / self.height as f64;
528        self.height = height;
529        self.width = (height as f64 * ratio) as u32;
530        self
531    }
532    
533    /// Add shadow effect (chainable)
534    pub fn shadow(mut self) -> Self {
535        self.effects.push(ImageEffect::Shadow);
536        self
537    }
538    
539    /// Add reflection effect (chainable)
540    pub fn reflection(mut self) -> Self {
541        self.effects.push(ImageEffect::Reflection);
542        self
543    }
544    
545    /// Add glow effect (chainable)
546    pub fn glow(mut self) -> Self {
547        self.effects.push(ImageEffect::Glow);
548        self
549    }
550    
551    /// Add soft edges effect (chainable)
552    pub fn soft_edges(mut self) -> Self {
553        self.effects.push(ImageEffect::SoftEdges);
554        self
555    }
556    
557    /// Add inner shadow effect (chainable)
558    pub fn inner_shadow(mut self) -> Self {
559        self.effects.push(ImageEffect::InnerShadow);
560        self
561    }
562    
563    /// Add blur effect (chainable)
564    pub fn blur(mut self) -> Self {
565        self.effects.push(ImageEffect::Blur);
566        self
567    }
568    
569    /// Add crop (chainable)
570    pub fn crop(mut self, left: f64, top: f64, right: f64, bottom: f64) -> Self {
571        self.crop = Some(Crop::new(left, top, right, bottom));
572        self
573    }
574
575    /// Build the image
576    pub fn build(self) -> Image {
577        Image {
578            filename: self.filename,
579            width: self.width,
580            height: self.height,
581            x: self.x,
582            y: self.y,
583            format: self.format,
584            source: self.source,
585            crop: self.crop,
586            effects: self.effects,
587        }
588    }
589    
590    /// Build with crop
591    pub fn build_with_crop(self, left: f64, top: f64, right: f64, bottom: f64) -> Image {
592        Image {
593            filename: self.filename,
594            width: self.width,
595            height: self.height,
596            x: self.x,
597            y: self.y,
598            format: self.format,
599            source: self.source,
600            crop: Some(Crop::new(left, top, right, bottom)),
601            effects: Vec::new(),
602        }
603    }
604    
605    /// Build with shadow effect
606    pub fn build_with_shadow(self) -> Image {
607        Image {
608            filename: self.filename,
609            width: self.width,
610            height: self.height,
611            x: self.x,
612            y: self.y,
613            format: self.format,
614            source: self.source,
615            crop: None,
616            effects: vec![ImageEffect::Shadow],
617        }
618    }
619    
620    /// Build with reflection effect
621    pub fn build_with_reflection(self) -> Image {
622        Image {
623            filename: self.filename,
624            width: self.width,
625            height: self.height,
626            x: self.x,
627            y: self.y,
628            format: self.format,
629            source: self.source,
630            crop: None,
631            effects: vec![ImageEffect::Reflection],
632        }
633    }
634    
635    /// Build with both shadow and reflection effects
636    pub fn build_with_effects(self) -> Image {
637        Image {
638            filename: self.filename,
639            width: self.width,
640            height: self.height,
641            x: self.x,
642            y: self.y,
643            format: self.format,
644            source: self.source,
645            crop: None,
646            effects: vec![ImageEffect::Shadow, ImageEffect::Reflection],
647        }
648    }
649    
650    /// Build with glow effect
651    pub fn build_with_glow(self) -> Image {
652        Image {
653            filename: self.filename,
654            width: self.width,
655            height: self.height,
656            x: self.x,
657            y: self.y,
658            format: self.format,
659            source: self.source,
660            crop: None,
661            effects: vec![ImageEffect::Glow],
662        }
663    }
664    
665    /// Build with soft edges effect
666    pub fn build_with_soft_edges(self) -> Image {
667        Image {
668            filename: self.filename,
669            width: self.width,
670            height: self.height,
671            x: self.x,
672            y: self.y,
673            format: self.format,
674            source: self.source,
675            crop: None,
676            effects: vec![ImageEffect::SoftEdges],
677        }
678    }
679    
680    /// Build with inner shadow effect
681    pub fn build_with_inner_shadow(self) -> Image {
682        Image {
683            filename: self.filename,
684            width: self.width,
685            height: self.height,
686            x: self.x,
687            y: self.y,
688            format: self.format,
689            source: self.source,
690            crop: None,
691            effects: vec![ImageEffect::InnerShadow],
692        }
693    }
694    
695    /// Build with blur effect
696    pub fn build_with_blur(self) -> Image {
697        Image {
698            filename: self.filename,
699            width: self.width,
700            height: self.height,
701            x: self.x,
702            y: self.y,
703            format: self.format,
704            source: self.source,
705            crop: None,
706            effects: vec![ImageEffect::Blur],
707        }
708    }
709}
710
711#[cfg(test)]
712mod tests {
713    use super::*;
714
715    #[test]
716    fn test_image_creation() {
717        let img = Image::new("test.png", 1920, 1080, "PNG");
718        assert_eq!(img.filename, "test.png");
719        assert_eq!(img.width, 1920);
720        assert_eq!(img.height, 1080);
721    }
722
723    #[test]
724    fn test_image_position() {
725        let img = Image::new("test.png", 1920, 1080, "PNG")
726            .position(500000, 1000000);
727        assert_eq!(img.x, 500000);
728        assert_eq!(img.y, 1000000);
729    }
730
731    #[test]
732    fn test_image_aspect_ratio() {
733        let img = Image::new("test.png", 1920, 1080, "PNG");
734        let ratio = img.aspect_ratio();
735        assert!((ratio - 1.777).abs() < 0.01);
736    }
737
738    #[test]
739    fn test_image_scale_to_width() {
740        let img = Image::new("test.png", 1920, 1080, "PNG")
741            .scale_to_width(960);
742        assert_eq!(img.width, 960);
743        assert_eq!(img.height, 540);
744    }
745
746    #[test]
747    fn test_image_scale_to_height() {
748        let img = Image::new("test.png", 1920, 1080, "PNG")
749            .scale_to_height(540);
750        assert_eq!(img.width, 960);
751        assert_eq!(img.height, 540);
752    }
753
754    #[test]
755    fn test_image_extension() {
756        let img = Image::new("photo.jpg", 1920, 1080, "JPEG");
757        assert_eq!(img.extension(), "jpg");
758    }
759
760    #[test]
761    fn test_image_mime_types() {
762        assert_eq!(
763            Image::new("test.png", 100, 100, "PNG").mime_type(),
764            "image/png"
765        );
766        assert_eq!(
767            Image::new("test.jpg", 100, 100, "JPG").mime_type(),
768            "image/jpeg"
769        );
770        assert_eq!(
771            Image::new("test.gif", 100, 100, "GIF").mime_type(),
772            "image/gif"
773        );
774    }
775
776    #[test]
777    fn test_image_builder() {
778        let img = ImageBuilder::new("photo.png", 1920, 1080)
779            .position(500000, 1000000)
780            .scale_to_width(960)
781            .build();
782
783        assert_eq!(img.filename, "photo.png");
784        assert_eq!(img.width, 960);
785        assert_eq!(img.height, 540);
786        assert_eq!(img.x, 500000);
787        assert_eq!(img.y, 1000000);
788    }
789
790    #[test]
791    fn test_image_builder_auto_format() {
792        let img = ImageBuilder::new("photo.jpg", 1920, 1080).build();
793        assert_eq!(img.format, "JPG");
794    }
795    
796    #[test]
797    fn test_image_from_base64() {
798        // 1x1 PNG image in base64
799        let base64_png = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==";
800        let img = Image::from_base64(base64_png, 100, 100, "PNG");
801        
802        assert!(img.filename.ends_with(".png"));
803        assert_eq!(img.format, "PNG");
804        assert!(matches!(img.source, Some(ImageSource::Base64(_))));
805    }
806    
807    #[test]
808    fn test_image_from_bytes() {
809        let data = vec![0x89, 0x50, 0x4E, 0x47]; // PNG header
810        let img = Image::from_bytes(data.clone(), 100, 100, "PNG");
811        
812        assert_eq!(img.format, "PNG");
813        assert!(matches!(img.source, Some(ImageSource::Bytes(_))));
814    }
815    
816    #[test]
817    fn test_base64_decode() {
818        // Test simple base64 decode
819        let result = base64_decode("SGVsbG8=").unwrap();
820        assert_eq!(result, b"Hello");
821        
822        // Test with padding
823        let result = base64_decode("SGVsbG8gV29ybGQ=").unwrap();
824        assert_eq!(result, b"Hello World");
825    }
826    
827    #[test]
828    fn test_image_get_bytes_base64() {
829        let base64_png = "SGVsbG8="; // "Hello" in base64
830        let img = Image::from_base64(base64_png, 100, 100, "PNG");
831        
832        let bytes = img.get_bytes().unwrap();
833        assert_eq!(bytes, b"Hello");
834    }
835    
836    #[test]
837    fn test_image_builder_from_base64() {
838        let base64_data = "SGVsbG8=";
839        let img = ImageBuilder::from_base64(base64_data, 200, 150, "JPEG")
840            .position(1000, 2000)
841            .build();
842        
843        assert_eq!(img.width, 200);
844        assert_eq!(img.height, 150);
845        assert_eq!(img.x, 1000);
846        assert_eq!(img.y, 2000);
847        assert_eq!(img.format, "JPEG");
848    }
849
850    #[test]
851    fn test_read_png_dimensions() {
852        // Minimal 1x1 PNG
853        let png: Vec<u8> = vec![
854            0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, // signature
855            0x00, 0x00, 0x00, 0x0D, // IHDR length
856            0x49, 0x48, 0x44, 0x52, // "IHDR"
857            0x00, 0x00, 0x00, 0x01, // width=1
858            0x00, 0x00, 0x00, 0x01, // height=1
859            0x08, 0x02, 0x00, 0x00, 0x00, // bit depth, color type, etc.
860        ];
861        let (w, h, fmt) = read_image_dimensions(&png).unwrap();
862        assert_eq!((w, h), (1, 1));
863        assert_eq!(fmt, "PNG");
864    }
865
866    #[test]
867    fn test_read_gif_dimensions() {
868        let gif: Vec<u8> = vec![
869            0x47, 0x49, 0x46, 0x38, 0x39, 0x61, // "GIF89a"
870            0x0A, 0x00, // width=10 (little-endian)
871            0x14, 0x00, // height=20
872        ];
873        let (w, h, fmt) = read_image_dimensions(&gif).unwrap();
874        assert_eq!((w, h), (10, 20));
875        assert_eq!(fmt, "GIF");
876    }
877
878    #[test]
879    fn test_read_bmp_dimensions() {
880        let mut bmp = vec![0u8; 26];
881        bmp[0] = 0x42; bmp[1] = 0x4D; // "BM"
882        bmp[18..22].copy_from_slice(&100u32.to_le_bytes()); // width=100
883        bmp[22..26].copy_from_slice(&200u32.to_le_bytes()); // height=200
884        let (w, h, fmt) = read_image_dimensions(&bmp).unwrap();
885        assert_eq!((w, h), (100, 200));
886        assert_eq!(fmt, "BMP");
887    }
888}
889
890/// Read image dimensions from file header bytes (PNG, JPEG, GIF, BMP, WebP).
891/// Returns (width, height, format_name) or None if unrecognized.
892fn read_image_dimensions(data: &[u8]) -> Option<(u32, u32, String)> {
893    if data.len() < 10 {
894        return None;
895    }
896    // PNG: 8-byte signature, then IHDR chunk with width/height as big-endian u32
897    if data.starts_with(&[0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]) && data.len() >= 24 {
898        let w = u32::from_be_bytes([data[16], data[17], data[18], data[19]]);
899        let h = u32::from_be_bytes([data[20], data[21], data[22], data[23]]);
900        return Some((w, h, "PNG".into()));
901    }
902    // JPEG: starts with FF D8, scan for SOF0/SOF2 marker
903    if data.starts_with(&[0xFF, 0xD8]) {
904        return read_jpeg_dimensions(data);
905    }
906    // GIF: "GIF87a" or "GIF89a", width/height as little-endian u16 at offset 6
907    if data.starts_with(b"GIF8") && data.len() >= 10 {
908        let w = u16::from_le_bytes([data[6], data[7]]) as u32;
909        let h = u16::from_le_bytes([data[8], data[9]]) as u32;
910        return Some((w, h, "GIF".into()));
911    }
912    // BMP: "BM", width/height as little-endian u32 at offset 18/22
913    if data.starts_with(b"BM") && data.len() >= 26 {
914        let w = u32::from_le_bytes([data[18], data[19], data[20], data[21]]);
915        let h = u32::from_le_bytes([data[22], data[23], data[24], data[25]]);
916        return Some((w, h, "BMP".into()));
917    }
918    // WebP: "RIFF....WEBP", VP8 chunk has dimensions
919    if data.len() >= 30 && &data[0..4] == b"RIFF" && &data[8..12] == b"WEBP" {
920        // VP8 lossy: width/height at offset 26/28 as little-endian u16
921        if &data[12..16] == b"VP8 " && data.len() >= 30 {
922            let w = u16::from_le_bytes([data[26], data[27]]) as u32 & 0x3FFF;
923            let h = u16::from_le_bytes([data[28], data[29]]) as u32 & 0x3FFF;
924            return Some((w, h, "WEBP".into()));
925        }
926        // VP8L lossless: dimensions encoded at offset 21
927        if &data[12..16] == b"VP8L" && data.len() >= 25 {
928            let b0 = data[21] as u32;
929            let b1 = data[22] as u32;
930            let b2 = data[23] as u32;
931            let b3 = data[24] as u32;
932            let bits = b0 | (b1 << 8) | (b2 << 16) | (b3 << 24);
933            let w = (bits & 0x3FFF) + 1;
934            let h = ((bits >> 14) & 0x3FFF) + 1;
935            return Some((w, h, "WEBP".into()));
936        }
937    }
938    None
939}
940
941/// Scan JPEG markers to find SOF0/SOF2 frame with dimensions
942fn read_jpeg_dimensions(data: &[u8]) -> Option<(u32, u32, String)> {
943    let mut i = 2;
944    while i + 1 < data.len() {
945        if data[i] != 0xFF {
946            i += 1;
947            continue;
948        }
949        let marker = data[i + 1];
950        i += 2;
951        // SOF0 (0xC0) or SOF2 (0xC2): height at +3, width at +5 (big-endian u16)
952        if (marker == 0xC0 || marker == 0xC2) && i + 7 < data.len() {
953            let h = u16::from_be_bytes([data[i + 3], data[i + 4]]) as u32;
954            let w = u16::from_be_bytes([data[i + 5], data[i + 6]]) as u32;
955            return Some((w, h, "JPEG".into()));
956        }
957        // Skip non-SOF markers by reading segment length
958        if marker >= 0xC0 && marker != 0xD9 && marker != 0xDA && i + 1 < data.len() {
959            let len = u16::from_be_bytes([data[i], data[i + 1]]) as usize;
960            i += len;
961        }
962    }
963    None
964}
ppt_rs/generator/images.rs

ppt_rs/generator/
images.rs
