Index: third_party/WebKit/Source/platform/image-encoders/PNGImageEncoder.cpp |
diff --git a/third_party/WebKit/Source/platform/image-encoders/PNGImageEncoder.cpp b/third_party/WebKit/Source/platform/image-encoders/PNGImageEncoder.cpp |
index 7ff85e56843c2be5be725558b5ca0c1aa0c0ab43..b88c64cc03d08746d50be04a8ab2e7192151ed31 100644 |
--- a/third_party/WebKit/Source/platform/image-encoders/PNGImageEncoder.cpp |
+++ b/third_party/WebKit/Source/platform/image-encoders/PNGImageEncoder.cpp |
@@ -60,20 +60,25 @@ std::unique_ptr<PNGImageEncoderState> PNGImageEncoderState::create( |
} |
// Optimize compression for speed. |
- // The parameters are the same as what libpng uses by default for RGB and RGBA images, except: |
- // The zlib compression level is set to 3 instead of 6, to avoid the lazy Ziv-Lempel match searching. |
+ // The parameters are the same as what libpng uses by default for RGB and RGBA |
+ // images, except: |
+ // The zlib compression level is set to 3 instead of 6, to avoid the lazy |
+ // Ziv-Lempel match searching. |
png_set_compression_level(png, 3); |
- // The zlib memory level is set to 8. This actually matches the default, we are just future-proofing. |
+ // The zlib memory level is set to 8. This actually matches the default, we |
+ // are just future-proofing. |
png_set_compression_mem_level(png, 8); |
// The zlib strategy is set to Z_FILTERED, which does not match the default. |
// Avoid the zlib strategies Z_HUFFMAN_ONLY or Z_RLE. |
- // Although they are the fastest for poorly-compressible images (e.g. photographs), |
- // they are very slow for highly-compressible images (e.g. text, drawings or business graphics) |
+ // Although they are the fastest for poorly-compressible images (e.g. |
+ // photographs), they are very slow for highly-compressible images (e.g. text, |
+ // drawings or business graphics) |
png_set_compression_strategy(png, Z_FILTERED); |
- // The delta filter is PNG_FILTER_SUB instead of PNG_ALL_FILTERS, to reduce the filter computations. |
+ // The delta filter is PNG_FILTER_SUB instead of PNG_ALL_FILTERS, to reduce |
+ // the filter computations. |
png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB); |
png_set_write_fn(png, output, writeOutput, 0); |