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
use super::geometry::Rect; use std::marker::PhantomData; pub struct Texture { data: Vec<u8>, width: u32, height: u32, } pub struct TextureViewAllocator { data: *mut [u8], width: u32, height: u32, free_space: Vec<Rect<u32>>, } pub struct TextureView { data: *mut [u8], view: Rect<u32>, } pub struct LockedTexture<'a> { texture: *mut Texture, phantom: PhantomData<&'a Texture>, } unsafe impl Send for TextureViewAllocator {} unsafe impl Sync for TextureViewAllocator {} unsafe impl Send for TextureView {} unsafe impl Sync for TextureView {} unsafe impl<'a> Send for LockedTexture<'a> {} unsafe impl<'a> Sync for LockedTexture<'a> {} impl TextureView { pub fn get_view(&self) -> Rect<u32> { self.view } } impl Texture { pub fn new(width: u32, height: u32) -> (Self, TextureViewAllocator) { let mut texture = Texture { data: vec![0; (width * height * 3) as usize], width, height, }; let allocator = TextureViewAllocator { data: texture.data.as_mut_slice(), width: width, height: height, free_space: vec![Rect::new(0, 0, width, height)], }; (texture, allocator) } pub fn get_width(&self) -> u32 { self.width } pub fn get_height(&self) -> u32 { self.height } pub fn get_data(&self) -> &[u8] { self.data.as_slice() } pub fn lock(&mut self) -> LockedTexture { LockedTexture { texture: self, phantom: PhantomData, } } } impl TextureViewAllocator { pub fn get_free_space(&self) -> f32 { let free_space_area: f32 = self .free_space .iter() .map(|s| (s.width() * s.height()) as f32) .sum(); free_space_area / (self.width * self.height) as f32 } pub fn allocate(&mut self, width: u32, height: u32) -> Option<TextureView> { if width == 0 || height == 0 { return None; } let pos = self .free_space .iter() .position(|space| width <= space.width() && height <= space.height())?; let slot = self.free_space.swap_remove(pos); let free_width = slot.width() - width; let free_height = slot.height() - height; if free_width < free_height { if free_width > 0 { self.free_space.push(Rect::new( slot.min.x + width, slot.min.y, slot.max.x, slot.min.y + height, )); } if free_height > 0 { self.free_space.push(Rect::new( slot.min.x, slot.min.y + height, slot.max.x, slot.max.y, )); } } else { if free_height > 0 { self.free_space.push(Rect::new( slot.min.x, slot.min.y + height, slot.min.x + width, slot.max.y, )); } if free_width > 0 { self.free_space.push(Rect::new( slot.min.x + width, slot.min.y, slot.max.x, slot.max.y, )); } } self.free_space .sort_by(|x, y| (x.width() * x.height()).cmp(&(y.width() * y.height()))); Some(TextureView { data: self.data, view: Rect::new( slot.min.x, slot.min.y, slot.min.x + width, slot.min.y + height, ), }) } } pub struct PixelView { pub x: u32, pub y: u32, pub width: u32, pub height: u32, pub top_pixel: [u8; 3], pub left_pixel: [u8; 3], pub top_left_pixel: [u8; 3], pub top_right_pixel: [u8; 3], } impl<'a> LockedTexture<'a> { pub fn modify_view<F: Fn(PixelView) -> [u8; 3]>(&self, view: &mut TextureView, func: F) { let texture = unsafe { &mut *self.texture }; assert!(view.data == texture.data.as_mut_slice()); let mut top_pixel = [0, 0, 0]; let mut left_pixel = [0, 0, 0]; let mut top_left_pixel = [0, 0, 0]; let mut top_right_pixel = [0, 0, 0]; for y in view.view.min.y..view.view.max.y { for x in view.view.min.x..view.view.max.x { if y > view.view.min.y { let top_offset = 3 * ((y - 1) * texture.width + x) as usize; top_pixel[0] = texture.data[top_offset]; top_pixel[1] = texture.data[top_offset + 1]; top_pixel[2] = texture.data[top_offset + 2]; if x >= view.view.max.x { top_right_pixel = [0, 0, 0]; } else { top_right_pixel[0] = texture.data[top_offset + 3]; top_right_pixel[1] = texture.data[top_offset + 4]; top_right_pixel[2] = texture.data[top_offset + 5]; } } let pixel = func(PixelView { x: x - view.view.min.x, y: y - view.view.min.y, width: view.view.width(), height: view.view.height(), top_pixel, left_pixel, top_left_pixel, top_right_pixel, }); let offset = 3 * (y * texture.width + x) as usize; texture.data[offset] = pixel[0]; texture.data[offset + 1] = pixel[1]; texture.data[offset + 2] = pixel[2]; left_pixel = pixel; top_left_pixel = top_pixel; } left_pixel = [0, 0, 0]; top_left_pixel = [0, 0, 0]; } } }