40 lines
1.4 KiB
Rust
40 lines
1.4 KiB
Rust
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#[derive(Clone, Copy)]
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pub struct QualitySettings {
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pub values: [u8; 8],
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}
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pub const QUANTIZATION_QUANT0_DIVISOR: usize = 0;
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pub const QUANTIZATION_CONSTANT: usize = 1;
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pub const QUANTIZATION_LINEAR: usize = 2;
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pub const QUANTIZATION_N_QUANTS_TO_KEEP: usize = 3;
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pub const THUMBNAIL_IS_WIDE: usize = 4;
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// 5, 6, 7: reserved
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impl QualitySettings {
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pub fn new(level: u8) -> Self {
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// Concept:
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// Levels 0, 1, and 2 are incredibly deep fried
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// Levels 3, 4, 5, 6 are usable with artifacting
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// Levels 7, 8, 9 are above what you would seriously use
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if level == 0 {
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return QualitySettings { values: [255, 255, 32, 1, 0, 0, 0, 0] };
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} else if level == 1 {
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return QualitySettings { values: [192, 192, 24, 2, 0, 0, 0, 0] };
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} else if level == 2 {
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return QualitySettings { values: [128, 128, 16, 3, 0, 0, 0, 0] };
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} else if level == 3 {
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return QualitySettings { values: [96, 96, 12, 4, 0, 0, 0, 0] };
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// TODO: Levels 4, 5, 6
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} else if level == 7 {
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return QualitySettings { values: [1, 24, 8, 24, 1, 0, 0, 0] };
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} else if level == 8 {
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return QualitySettings { values: [1, 12, 4, 48, 1, 0, 0, 0] };
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} else { // level >= 9
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return QualitySettings { values: [1, 1, 1, 96, 1, 0, 0, 0] };
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}
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}
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}
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