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3bd5ef3384
commit
a3465d2962
7 changed files with 44 additions and 2 deletions
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@ -27,6 +27,20 @@ fn byte_swap(data: &mut [u8]) {
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}
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}
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// TODO(pcwalton): Speed up with SIMD, or better yet, find some way to not do this.
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fn byte_swap_and_premultiply(data: &mut [u8]) {
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let length = data.len();
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for i in range_step(0, length, 4) {
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let r = data[i + 2];
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let g = data[i + 1];
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let b = data[i + 0];
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let a = data[i + 3];
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data[i + 0] = ((r as u32) * (a as u32) / 255) as u8;
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data[i + 1] = ((g as u32) * (a as u32) / 255) as u8;
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data[i + 2] = ((b as u32) * (a as u32) / 255) as u8;
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}
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}
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pub fn load_from_memory(buffer: &[u8]) -> Option<Image> {
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if buffer.len() == 0 {
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return None;
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@ -36,8 +50,9 @@ pub fn load_from_memory(buffer: &[u8]) -> Option<Image> {
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match png::load_png_from_memory(buffer) {
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Ok(mut png_image) => {
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match png_image.pixels {
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png::RGB8(ref mut data) | png::RGBA8(ref mut data) => {
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byte_swap(data.as_mut_slice());
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png::RGB8(ref mut data) => byte_swap(data.as_mut_slice()),
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png::RGBA8(ref mut data) => {
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byte_swap_and_premultiply(data.as_mut_slice())
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}
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_ => {}
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}
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