From d18850ebabe36aa9be91d80b14acac23bca94d6e Mon Sep 17 00:00:00 2001 From: Josh Holmer Date: Wed, 8 Mar 2017 10:11:13 -0500 Subject: [PATCH] Ignore color reductions that would increase file size Closes #61 --- CHANGELOG.md | 3 + src/png.rs | 5 - src/reduction.rs | 88 +---- .../grayscale_16_should_be_palette_1.png | Bin 16691 -> 0 bytes .../grayscale_16_should_be_palette_2.png | Bin 16364 -> 0 bytes .../grayscale_16_should_be_palette_4.png | Bin 17114 -> 0 bytes ...grayscale_alpha_16_should_be_palette_1.png | Bin 17274 -> 0 bytes ...grayscale_alpha_16_should_be_palette_2.png | Bin 17372 -> 0 bytes ...grayscale_alpha_16_should_be_palette_4.png | Bin 18282 -> 0 bytes .../grayscale_alpha_8_should_be_palette_1.png | Bin 16706 -> 0 bytes .../grayscale_alpha_8_should_be_palette_2.png | Bin 16786 -> 0 bytes .../grayscale_alpha_8_should_be_palette_4.png | Bin 17424 -> 0 bytes ...laced_grayscale_16_should_be_palette_1.png | Bin 17308 -> 0 bytes ...laced_grayscale_16_should_be_palette_2.png | Bin 16912 -> 0 bytes ...laced_grayscale_16_should_be_palette_4.png | Bin 18747 -> 0 bytes ...rlaced_grayscale_8_should_be_palette_1.png | Bin 16650 -> 0 bytes ...rlaced_grayscale_8_should_be_palette_2.png | Bin 16529 -> 0 bytes ...rlaced_grayscale_8_should_be_palette_4.png | Bin 18247 -> 0 bytes ...grayscale_alpha_16_should_be_palette_1.png | Bin 17873 -> 0 bytes ...grayscale_alpha_16_should_be_palette_2.png | Bin 18144 -> 0 bytes ...grayscale_alpha_16_should_be_palette_4.png | Bin 20168 -> 0 bytes ..._grayscale_alpha_8_should_be_palette_1.png | Bin 17232 -> 0 bytes ..._grayscale_alpha_8_should_be_palette_2.png | Bin 17485 -> 0 bytes ..._grayscale_alpha_8_should_be_palette_4.png | Bin 19257 -> 0 bytes ...d_rgb_16_should_be_palette_1_grayscale.png | Bin 18083 -> 0 bytes ...d_rgb_16_should_be_palette_2_grayscale.png | Bin 18048 -> 0 bytes ...d_rgb_16_should_be_palette_4_grayscale.png | Bin 19908 -> 0 bytes ...ed_rgb_8_should_be_palette_1_grayscale.png | Bin 17187 -> 0 bytes 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.../rgba_16_should_be_palette_1_grayscale.png | Bin 17724 -> 0 bytes .../rgba_16_should_be_palette_2_grayscale.png | Bin 19051 -> 0 bytes .../rgba_16_should_be_palette_4_grayscale.png | Bin 20154 -> 0 bytes .../rgba_8_should_be_palette_1_grayscale.png | Bin 16924 -> 0 bytes .../rgba_8_should_be_palette_2_grayscale.png | Bin 17372 -> 0 bytes .../rgba_8_should_be_palette_4_grayscale.png | Bin 18291 -> 0 bytes tests/interlaced.rs | 360 ------------------ tests/reduction.rs | 360 ------------------ 50 files changed, 15 insertions(+), 801 deletions(-) delete mode 100644 tests/files/grayscale_16_should_be_palette_1.png delete mode 100644 tests/files/grayscale_16_should_be_palette_2.png delete mode 100644 tests/files/grayscale_16_should_be_palette_4.png delete mode 100644 tests/files/grayscale_alpha_16_should_be_palette_1.png delete mode 100644 tests/files/grayscale_alpha_16_should_be_palette_2.png delete mode 100644 tests/files/grayscale_alpha_16_should_be_palette_4.png delete mode 100644 tests/files/grayscale_alpha_8_should_be_palette_1.png delete mode 100644 tests/files/grayscale_alpha_8_should_be_palette_2.png delete mode 100644 tests/files/grayscale_alpha_8_should_be_palette_4.png delete mode 100644 tests/files/interlaced_grayscale_16_should_be_palette_1.png delete mode 100644 tests/files/interlaced_grayscale_16_should_be_palette_2.png delete mode 100644 tests/files/interlaced_grayscale_16_should_be_palette_4.png delete mode 100644 tests/files/interlaced_grayscale_8_should_be_palette_1.png delete mode 100644 tests/files/interlaced_grayscale_8_should_be_palette_2.png delete mode 100644 tests/files/interlaced_grayscale_8_should_be_palette_4.png delete mode 100644 tests/files/interlaced_grayscale_alpha_16_should_be_palette_1.png delete mode 100644 tests/files/interlaced_grayscale_alpha_16_should_be_palette_2.png delete mode 100644 tests/files/interlaced_grayscale_alpha_16_should_be_palette_4.png delete mode 100644 tests/files/interlaced_grayscale_alpha_8_should_be_palette_1.png delete mode 100644 tests/files/interlaced_grayscale_alpha_8_should_be_palette_2.png delete mode 100644 tests/files/interlaced_grayscale_alpha_8_should_be_palette_4.png delete mode 100644 tests/files/interlaced_rgb_16_should_be_palette_1_grayscale.png delete mode 100644 tests/files/interlaced_rgb_16_should_be_palette_2_grayscale.png delete mode 100644 tests/files/interlaced_rgb_16_should_be_palette_4_grayscale.png delete mode 100644 tests/files/interlaced_rgb_8_should_be_palette_1_grayscale.png delete mode 100644 tests/files/interlaced_rgb_8_should_be_palette_2_grayscale.png delete mode 100644 tests/files/interlaced_rgb_8_should_be_palette_4_grayscale.png delete mode 100644 tests/files/interlaced_rgba_16_should_be_palette_1_grayscale.png delete mode 100644 tests/files/interlaced_rgba_16_should_be_palette_2_grayscale.png delete mode 100644 tests/files/interlaced_rgba_16_should_be_palette_4_grayscale.png delete mode 100644 tests/files/interlaced_rgba_8_should_be_palette_1_grayscale.png delete mode 100644 tests/files/interlaced_rgba_8_should_be_palette_2_grayscale.png delete mode 100644 tests/files/interlaced_rgba_8_should_be_palette_4_grayscale.png delete mode 100644 tests/files/rgb_16_should_be_palette_1_grayscale.png delete mode 100644 tests/files/rgb_16_should_be_palette_2_grayscale.png delete mode 100644 tests/files/rgb_16_should_be_palette_4_grayscale.png delete mode 100644 tests/files/rgb_8_should_be_palette_1_grayscale.png delete mode 100644 tests/files/rgb_8_should_be_palette_2_grayscale.png delete mode 100644 tests/files/rgb_8_should_be_palette_4_grayscale.png delete mode 100644 tests/files/rgba_16_should_be_palette_1_grayscale.png delete mode 100644 tests/files/rgba_16_should_be_palette_2_grayscale.png delete mode 100644 tests/files/rgba_16_should_be_palette_4_grayscale.png delete mode 100644 tests/files/rgba_8_should_be_palette_1_grayscale.png delete mode 100644 tests/files/rgba_8_should_be_palette_2_grayscale.png delete mode 100644 tests/files/rgba_8_should_be_palette_4_grayscale.png diff --git a/CHANGELOG.md b/CHANGELOG.md index 5c8179b0..1aede44a 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1,3 +1,6 @@ +**Version 0.15.1 (unreleased)** + - Ignore color reductions that would increase file size ([#61](https://github.com/shssoichiro/oxipng/issues/61)) + **Version 0.15.0** - [SEMVER_MINOR] Check images for correctness before writing result ([#60](https://github.com/shssoichiro/oxipng/issues/60)) - Fix invalid output when reducing image to a different color type but file size does not improve ([#60](https://github.com/shssoichiro/oxipng/issues/60)) diff --git a/src/png.rs b/src/png.rs index 9ff1aa86..1c5c0d60 100644 --- a/src/png.rs +++ b/src/png.rs @@ -717,11 +717,6 @@ impl PngData { should_reduce_bit_depth = true; } - if self.ihdr_data.color_type == ColorType::Grayscale && reduce_grayscale_to_palette(self) { - changed = true; - should_reduce_bit_depth = true; - } - if should_reduce_bit_depth { // Some conversions will allow us to perform bit depth reduction that // wasn't possible before diff --git a/src/reduction.rs b/src/reduction.rs index 61964126..81b66773 100644 --- a/src/reduction.rs +++ b/src/reduction.rs @@ -152,6 +152,12 @@ pub fn reduce_rgba_to_palette(png: &mut PngData) -> bool { } } + let headers_size = color_palette.len() + trans_palette.len() + 8; + if reduced.len() + headers_size > png.raw_data.len() * 4 { + // Reduction would result in a larger image + return false; + } + if let Some(bkgd_header) = png.aux_headers.get_mut(&"bKGD".to_string()) { assert_eq!(bkgd_header.len(), 6); let header_pixels = bkgd_header.iter().skip(1).step(2).cloned().collect::>(); @@ -217,6 +223,12 @@ pub fn reduce_rgb_to_palette(png: &mut PngData) -> bool { color_palette.extend_from_slice(color); } + let headers_size = color_palette.len() + 4; + if reduced.len() + headers_size > png.raw_data.len() * 3 { + // Reduction would result in a larger image + return false; + } + if let Some(bkgd_header) = png.aux_headers.get_mut(&"bKGD".to_string()) { assert_eq!(bkgd_header.len(), 6); let header_pixels = bkgd_header.iter().skip(1).step(2).cloned().collect::>(); @@ -237,82 +249,6 @@ pub fn reduce_rgb_to_palette(png: &mut PngData) -> bool { true } -pub fn reduce_grayscale_to_palette(png: &mut PngData) -> bool { - if png.ihdr_data.bit_depth == BitDepth::Sixteen { - return false; - } - let mut reduced = BitVec::with_capacity(png.raw_data.len() * 8); - // Only perform reduction if we can get to 4-bits or less - let mut palette = Vec::with_capacity(16); - let bpp: usize = png.ihdr_data.bit_depth.as_u8() as usize; - let bpp_inverse = 8 - bpp; - for line in png.scan_lines() { - reduced.extend(BitVec::from_bytes(&[line.filter])); - let bit_vec = BitVec::from_bytes(&line.data); - let mut cur_pixel = BitVec::with_capacity(bpp); - for (i, bit) in bit_vec.iter().enumerate() { - cur_pixel.push(bit); - if i % bpp == bpp - 1 { - let pix_value = cur_pixel.to_bytes()[0] >> bpp_inverse; - let pix_slice = vec![pix_value, pix_value, pix_value]; - if palette.contains(&pix_slice) { - let index = palette.iter().enumerate().find(|&x| x.1 == &pix_slice).unwrap().0; - let idx = BitVec::from_bytes(&[(index as u8) << bpp_inverse]); - for b in idx.iter().take(bpp) { - reduced.push(b); - } - } else { - let len = palette.len(); - if len == 16 { - return false; - } - palette.push(pix_slice); - let idx = BitVec::from_bytes(&[(len as u8) << bpp_inverse]); - for b in idx.iter().take(bpp) { - reduced.push(b); - } - } - cur_pixel = BitVec::with_capacity(bpp); - } - } - // Pad end of line to get 8 bits per byte - while reduced.len() % 8 != 0 { - reduced.push(false); - } - } - - let mut color_palette = Vec::with_capacity(palette.len() * 3); - for color in &palette { - color_palette.extend_from_slice(color); - } - - if let Some(bkgd_header) = png.aux_headers.get_mut(&"bKGD".to_string()) { - assert_eq!(bkgd_header.len(), 2); - let header_pixels = [bkgd_header[1], bkgd_header[1], bkgd_header[1]]; - if let Some(entry) = color_palette.chunks(3).position(|x| *x == header_pixels) { - *bkgd_header = vec![entry as u8]; - } else if color_palette.len() == 255 { - return false; - } else { - let entry = color_palette.len() / 3; - color_palette.extend_from_slice(&header_pixels); - *bkgd_header = vec![entry as u8]; - } - } - - if let Some(sbit_header) = png.aux_headers.get_mut(&"sBIT".to_string()) { - assert_eq!(sbit_header.len(), 1); - let byte = sbit_header[0]; - sbit_header.push(byte); - sbit_header.push(byte); - } - - png.raw_data = reduced.to_bytes(); - png.palette = Some(color_palette); - png.ihdr_data.color_type = ColorType::Indexed; - true -} - pub fn reduce_rgb_to_grayscale(png: &mut PngData) -> bool { let mut reduced = Vec::with_capacity(png.raw_data.len()); let byte_depth: u8 = png.ihdr_data.bit_depth.as_u8() >> 3; diff --git a/tests/files/grayscale_16_should_be_palette_1.png 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