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examples: Return a Result for load_file_into_vec()
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 29 Jan 2020 17:45:25 +0100
parents ee45bfde91bb
children a662dddd4a2b
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1 use image::{GenericImageView, DynamicImage, GrayImage, ImageError};
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2 use luminance::pixel::{NormRGB8UI, NormRGBA8UI};
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3 use luminance::texture::{Dim2, Flat, Sampler, Texture, GenMipmaps};
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4 use luminance_glfw::GlfwSurface;
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5 use touhou::th06::anm0::Anm0;
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6 use std::fs::File;
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7 use std::io::{self, BufReader, Read};
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8 use std::path::Path;
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9
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10 pub fn load_file_into_vec<P: AsRef<Path>>(filename: P) -> io::Result<Vec<u8>> {
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11 let file = File::open(filename)?;
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12 let mut file = BufReader::new(file);
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13 let mut buf = vec![];
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14 file.read_to_end(&mut buf)?;
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15 Ok(buf)
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16 }
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17
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18 pub enum LoadedTexture {
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19 Rgba(Texture<Flat, Dim2, NormRGBA8UI>),
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20 Rgb(Texture<Flat, Dim2, NormRGB8UI>),
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21 }
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22
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23 #[derive(Debug)]
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24 pub enum TextureLoadError {
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25 CannotOpenRgb(String, ImageError),
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26 CannotOpenAlpha(String, ImageError),
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27 AlphaToGrayscale(String),
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28 }
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29
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30 fn open_rgb_png(path: &Path) -> Result<DynamicImage, TextureLoadError> {
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31 // load the texture into memory as a whole bloc (i.e. no streaming)
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32 image::open(&path).map_err(|e| TextureLoadError::CannotOpenRgb(path.to_str().unwrap().to_owned(), e))
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33 }
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34
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35 fn open_alpha_png(path: &Path) -> Result<DynamicImage, TextureLoadError> {
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36 // load the texture into memory as a whole bloc (i.e. no streaming)
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37 image::open(&path).map_err(|e| TextureLoadError::CannotOpenAlpha(path.to_str().unwrap().to_owned(), e))
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38 }
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39
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40 fn merge_rgb_alpha(rgb: &DynamicImage, alpha: &GrayImage) -> Vec<(u8, u8, u8, u8)> {
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41 rgb
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42 .pixels()
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43 .zip(alpha.pixels())
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44 .map(|((_x, _y, rgb), luma)| (rgb[0], rgb[1], rgb[2], luma[0]))
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45 .collect::<Vec<_>>()
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46 }
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47
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48 pub fn load_from_data(data: &[u8]) -> Result<DynamicImage, ImageError> {
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49 image::load_from_memory(data)
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50 }
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51
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52 pub fn reupload_texture_from_rgb_image(tex: &mut Texture<Flat, Dim2, NormRGB8UI>, img: DynamicImage) -> Result<(), TextureLoadError> {
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53 let texels = img
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54 .pixels()
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55 .map(|(_x, _y, rgb)| (rgb[0], rgb[1], rgb[2]))
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56 .collect::<Vec<_>>();
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57
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58 // the first argument disables mipmap generation (we don’t care so far)
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59 tex.upload(GenMipmaps::No, &texels).unwrap();
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60
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61 Ok(())
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62 }
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63
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64 pub fn upload_texture_from_rgb_image(surface: &mut GlfwSurface, img: DynamicImage) -> Result<LoadedTexture, TextureLoadError> {
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65 let (width, height) = img.dimensions();
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66
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67 // create the luminance texture; the third argument is the number of mipmaps we want (leave it
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68 // to 0 for now) and the latest is a the sampler to use when sampling the texels in the
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69 // shader (we’ll just use the default one)
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70 let mut tex =
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71 Texture::new(surface, [width, height], 0, Sampler::default()).expect("luminance texture creation");
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72
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73 reupload_texture_from_rgb_image(&mut tex, img)?;
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74
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75 Ok(LoadedTexture::Rgb(tex))
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76 }
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77
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78 pub fn load_rgb_texture(surface: &mut GlfwSurface, path: &Path) -> Result<LoadedTexture, TextureLoadError> {
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79 let img = open_rgb_png(&path)?;
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80 upload_texture_from_rgb_image(surface, img)
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81 }
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82
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83 fn load_rgb_a_pngs(surface: &mut GlfwSurface, rgb: &Path, alpha: &Path) -> Result<LoadedTexture, TextureLoadError> {
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84 let img = open_alpha_png(&alpha)?;
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85 let alpha = match img.grayscale() {
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86 DynamicImage::ImageLuma8(img) => img,
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87 _ => {
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88 return Err(TextureLoadError::AlphaToGrayscale(alpha.to_str().unwrap().to_owned()))
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89 }
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90 };
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91 let (width, height) = img.dimensions();
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92 let img = open_rgb_png(&rgb)?;
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93 assert_eq!((width, height), img.dimensions());
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94 let texels = merge_rgb_alpha(&img, &alpha);
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95
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96 // create the luminance texture; the third argument is the number of mipmaps we want (leave it
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97 // to 0 for now) and the latest is a the sampler to use when sampling the texels in the
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98 // shader (we’ll just use the default one)
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99 let tex =
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100 Texture::new(surface, [width, height], 0, Sampler::default()).expect("luminance texture creation");
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101
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102 // the first argument disables mipmap generation (we don’t care so far)
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103 tex.upload(GenMipmaps::No, &texels).unwrap();
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104
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105 Ok(LoadedTexture::Rgba(tex))
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106 }
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107
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108 pub fn load_anm_image<P: AsRef<Path>>(mut surface: &mut GlfwSurface, anm0: &Anm0, anm_filename: P) -> Result<LoadedTexture, TextureLoadError> {
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109 let anm_filename = anm_filename.as_ref();
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110 let png_filename = anm_filename.with_file_name(Path::new(&anm0.png_filename).file_name().unwrap());
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111 match anm0.alpha_filename {
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112 Some(ref filename) => {
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113 let alpha_filename = anm_filename.with_file_name(Path::new(filename).file_name().unwrap());
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114 load_rgb_a_pngs(&mut surface, &png_filename, &alpha_filename)
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115 },
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116 None => {
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117 load_rgb_texture(&mut surface, &png_filename)
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118 }
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119 }
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120 }