├── src ├── test │ ├── resources │ │ ├── test-1.png │ │ ├── test-2.png │ │ ├── test-3.png │ │ └── test-4.png │ └── java │ │ └── com │ │ └── biejieshi │ │ └── compress │ │ └── PngCompressUtilsTest.java └── main │ ├── resources │ └── libimagequant │ │ ├── libimagequant.dll │ │ ├── libimagequant.so │ │ └── libimagequant.jnilib │ └── java │ ├── org │ └── pngquant │ │ ├── PngQuantException.java │ │ ├── Image.java │ │ ├── LiqObject.java │ │ ├── Result.java │ │ └── PngQuant.java │ └── com │ └── biejieshi │ └── compress │ └── PngCompressUtils.java ├── pom.xml ├── .gitignore ├── README.md └── LICENSE /src/test/resources/test-1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Lcry/java-png-compress-util/HEAD/src/test/resources/test-1.png -------------------------------------------------------------------------------- /src/test/resources/test-2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Lcry/java-png-compress-util/HEAD/src/test/resources/test-2.png -------------------------------------------------------------------------------- /src/test/resources/test-3.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Lcry/java-png-compress-util/HEAD/src/test/resources/test-3.png -------------------------------------------------------------------------------- /src/test/resources/test-4.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Lcry/java-png-compress-util/HEAD/src/test/resources/test-4.png -------------------------------------------------------------------------------- /src/main/resources/libimagequant/libimagequant.dll: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Lcry/java-png-compress-util/HEAD/src/main/resources/libimagequant/libimagequant.dll -------------------------------------------------------------------------------- /src/main/resources/libimagequant/libimagequant.so: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Lcry/java-png-compress-util/HEAD/src/main/resources/libimagequant/libimagequant.so -------------------------------------------------------------------------------- /src/main/resources/libimagequant/libimagequant.jnilib: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Lcry/java-png-compress-util/HEAD/src/main/resources/libimagequant/libimagequant.jnilib -------------------------------------------------------------------------------- /src/main/java/org/pngquant/PngQuantException.java: -------------------------------------------------------------------------------- 1 | package org.pngquant; 2 | 3 | /** 4 | * @author lcry 5 | */ 6 | public class PngQuantException extends Exception { 7 | } 8 | -------------------------------------------------------------------------------- /src/main/java/com/biejieshi/compress/PngCompressUtils.java: -------------------------------------------------------------------------------- 1 | package com.biejieshi.compress; 2 | 3 | import org.pngquant.PngQuant; 4 | 5 | import java.awt.image.BufferedImage; 6 | import java.util.Optional; 7 | 8 | /** 9 | * Png图片压缩工具类 10 | * 11 | * @author lcry 12 | */ 13 | public class PngCompressUtils { 14 | /** 15 | * 压缩图片bufferedImage，若无法达到压缩比例，原样返回 16 | * 17 | * @param bufferedImage 待压缩的bufferedImage 18 | * @return 压缩后的bufferedImage 19 | */ 20 | public static BufferedImage compressPng(BufferedImage bufferedImage) { 21 | PngQuant pngQuant = new PngQuant(); 22 | //压缩质量质量在 0-100 范围内。如果给定数量的颜色无法达到最低质量，则量化将失败 23 | //如果可能，使用质量 80。如果质量低于 65，则放弃。 24 | pngQuant.setQuality(65, 80); 25 | return Optional.ofNullable(pngQuant.getRemapped(bufferedImage)).orElse(bufferedImage); 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /src/test/java/com/biejieshi/compress/PngCompressUtilsTest.java: -------------------------------------------------------------------------------- 1 | package com.biejieshi.compress; 2 | 3 | import org.junit.Test; 4 | 5 | import javax.imageio.ImageIO; 6 | import java.io.FileOutputStream; 7 | import java.io.IOException; 8 | import java.io.InputStream; 9 | 10 | /** 11 | * Unit test for simple App. 12 | */ 13 | public class PngCompressUtilsTest { 14 | /** 15 | * 测试png压缩 16 | */ 17 | @Test 18 | public void testPngCompress() { 19 | String testFileName = "test-1.png"; 20 | InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(testFileName); 21 | try { 22 | assert inputStream != null; 23 | ImageIO.write(PngCompressUtils.compressPng(ImageIO.read(inputStream)), "png", 24 | new FileOutputStream(testFileName.replace(".png", "") + "-compress-result.png")); 25 | } catch (IOException e) { 26 | e.printStackTrace(); 27 | } 28 | System.out.println("compress complete!"); 29 | } 30 | 31 | } 32 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 5 | 4.0.0 6 | 7 | com.biejieshi.compress 8 | java-png-compress-util 9 | 2022.1.0 10 | Java实现的Png图片压缩工具类，底层使用pngquant，仅支持png格式的压缩，参考：https://pngquant.org/lib/ 11 | 12 | java-png-compress-util 13 | https://www.biejieshi.com 14 | 15 | 16 | UTF-8 17 | 8 18 | 8 19 | 20 | 21 | 22 | 23 | junit 24 | junit 25 | 4.13.2 26 | test 27 | 28 | 29 | commons-io 30 | commons-io 31 | 2.11.0 32 | 33 | 34 | 35 | 36 | 37 | 38 | org.apache.maven.plugins 39 | maven-shade-plugin 40 | 41 | 42 | package 43 | 44 | shade 45 | 46 | 47 | true 48 | 49 | 51 | com.biejieshi.compress.PngCompressUtils 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by .ignore support plugin (hsz.mobi) 2 | ### Windows template 3 | # Windows thumbnail cache files 4 | Thumbs.db 5 | Thumbs.db:encryptable 6 | ehthumbs.db 7 | ehthumbs_vista.db 8 | 9 | # Dump file 10 | *.stackdump 11 | 12 | # Folder config file 13 | [Dd]esktop.ini 14 | 15 | # Recycle Bin used on file shares 16 | $RECYCLE.BIN/ 17 | 18 | # Windows Installer files 19 | *.cab 20 | *.msi 21 | *.msix 22 | *.msm 23 | *.msp 24 | 25 | # Windows shortcuts 26 | *.lnk 27 | 28 | ### Eclipse template 29 | .metadata 30 | bin/ 31 | tmp/ 32 | *.tmp 33 | *.bak 34 | *.swp 35 | *~.nib 36 | local.properties 37 | .settings/ 38 | .loadpath 39 | .recommenders 40 | 41 | # External tool builders 42 | .externalToolBuilders/ 43 | 44 | # Locally stored "Eclipse launch configurations" 45 | *.launch 46 | 47 | # PyDev specific (Python IDE for Eclipse) 48 | *.pydevproject 49 | 50 | # CDT-specific (C/C++ Development Tooling) 51 | .cproject 52 | 53 | # CDT- autotools 54 | .autotools 55 | 56 | # Java annotation processor (APT) 57 | .factorypath 58 | 59 | # PDT-specific (PHP Development Tools) 60 | .buildpath 61 | 62 | # sbteclipse plugin 63 | .target 64 | 65 | # Tern plugin 66 | .tern-project 67 | 68 | # TeXlipse plugin 69 | .texlipse 70 | 71 | # STS (Spring Tool Suite) 72 | .springBeans 73 | 74 | # Code Recommenders 75 | .recommenders/ 76 | 77 | # Annotation Processing 78 | .apt_generated/ 79 | .apt_generated_test/ 80 | 81 | # Scala IDE specific (Scala & Java development for Eclipse) 82 | .cache-main 83 | .scala_dependencies 84 | .worksheet 85 | 86 | # Uncomment this line if you wish to ignore the project description file. 87 | # Typically, this file would be tracked if it contains build/dependency configurations: 88 | #.project 89 | 90 | ### Java template 91 | # Compiled class file 92 | *.class 93 | 94 | # Log file 95 | *.log 96 | 97 | # BlueJ files 98 | *.ctxt 99 | 100 | # Mobile Tools for Java (J2ME) 101 | .mtj.tmp/ 102 | 103 | # Package Files # 104 | *.jar 105 | *.war 106 | *.nar 107 | *.ear 108 | *.zip 109 | *.tar.gz 110 | *.rar 111 | 112 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 113 | hs_err_pid* 114 | 115 | ### macOS template 116 | # General 117 | .DS_Store 118 | .AppleDouble 119 | .LSOverride 120 | 121 | # Icon must end with two \r 122 | Icon 123 | 124 | # Thumbnails 125 | ._* 126 | 127 | # Files that might appear in the root of a volume 128 | .DocumentRevisions-V100 129 | .fseventsd 130 | .Spotlight-V100 131 | .TemporaryItems 132 | .Trashes 133 | .VolumeIcon.icns 134 | .com.apple.timemachine.donotpresent 135 | 136 | # Directories potentially created on remote AFP share 137 | .AppleDB 138 | .AppleDesktop 139 | Network Trash Folder 140 | Temporary Items 141 | .apdisk 142 | target/ 143 | -------------------------------------------------------------------------------- /src/main/java/org/pngquant/Image.java: -------------------------------------------------------------------------------- 1 | package org.pngquant; 2 | 3 | import java.awt.image.*; 4 | 5 | /** 6 | * PngQuant's representation of an Image constructed from BufferedImage. 7 | */ 8 | public class Image extends LiqObject { 9 | 10 | /** 11 | * Converts BufferedImage to internal representation (pixel data is copied). 12 | * It's best to use BufferedImage in RGB/RGBA format backed by DataBufferByte. 13 | * Throws if conversion fails. 14 | */ 15 | public Image(BufferedImage image) throws PngQuantException { 16 | this(new PngQuant(), image); 17 | } 18 | 19 | public Image(PngQuant attr, BufferedImage image) throws PngQuantException { 20 | handle = handleFromImage(attr, image); 21 | 22 | if (handle == 0) { 23 | BufferedImage converted = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_4BYTE_ABGR); 24 | converted.getGraphics().drawImage(image, 0, 0, null); 25 | handle = handleFromImage(attr, converted); 26 | 27 | if (handle == 0) { 28 | throw new PngQuantException(); 29 | } 30 | } 31 | } 32 | 33 | private static long handleFromImage(PngQuant attr, BufferedImage image) { 34 | // The JNI wrapper will accept non-premultiplied ABGR and BGR only. 35 | int type = image.getType(); 36 | if (type != BufferedImage.TYPE_3BYTE_BGR && 37 | type != BufferedImage.TYPE_4BYTE_ABGR && 38 | type != BufferedImage.TYPE_4BYTE_ABGR_PRE) { 39 | return 0; 40 | } 41 | 42 | WritableRaster raster = image.getRaster(); 43 | ColorModel color = image.getColorModel(); 44 | if (type == BufferedImage.TYPE_4BYTE_ABGR_PRE) { 45 | color.coerceData(raster, false); 46 | } 47 | 48 | DataBuffer buffer = raster.getDataBuffer(); 49 | if (buffer instanceof DataBufferByte) { 50 | byte[] imageData = ((DataBufferByte) buffer).getData(); 51 | return liq_image_create(attr.handle, imageData, 52 | raster.getWidth(), raster.getHeight(), color.getNumComponents()); 53 | } 54 | return 0; 55 | } 56 | 57 | private static native long liq_image_create(long attr, byte[] bitmap, int width, int height, int components); 58 | 59 | private static native void liq_image_destroy(long handle); 60 | 61 | /** 62 | * Guarantees presence of the given color in the palette (subject to setMaxColors()) 63 | * if this image is used for quantization. 64 | */ 65 | public native boolean addFixedColor(int r, int g, int b, int a); 66 | 67 | public boolean addFixedColor(int r, int g, int b) { 68 | return addFixedColor(r, g, b, 255); 69 | } 70 | 71 | public native int getWidth(); 72 | 73 | public native int getHeight(); 74 | 75 | @Override 76 | public void close() { 77 | if (handle != 0) { 78 | liq_image_destroy(handle); 79 | handle = 0; 80 | } 81 | } 82 | } 83 | -------------------------------------------------------------------------------- /src/main/java/org/pngquant/LiqObject.java: -------------------------------------------------------------------------------- 1 | package org.pngquant; 2 | 3 | import org.apache.commons.io.FileUtils; 4 | 5 | import java.io.File; 6 | import java.io.IOException; 7 | import java.io.InputStream; 8 | 9 | abstract class LiqObject { 10 | static { 11 | //方法一：直接设置java.library.path依赖路径 12 | // libimagequant.jnilib or libimagequant.so must be in java.library.path 13 | // System.loadLibrary("libimagequant"); 14 | //方法二: 直接拷贝加载 15 | try { 16 | loadLibrary(); 17 | System.out.println("load libimagequant lib successful!"); 18 | } catch (IOException e) { 19 | e.printStackTrace(); 20 | } 21 | } 22 | 23 | long handle; 24 | 25 | /** 26 | * 根据不同系统load不同依赖 27 | * 28 | * @throws IOException IO异常 29 | */ 30 | public static void loadLibrary() throws IOException { 31 | File directory = new File(System.getProperty("java.io.tmpdir"), "libimagequant_temp"); 32 | System.out.println("load lib to path:" + directory.getAbsolutePath()); 33 | if (!directory.exists()) { 34 | if (!directory.mkdirs()) { 35 | throw new RuntimeException("create libimagequant library dir failed!"); 36 | } 37 | } 38 | FileUtils.cleanDirectory(directory); 39 | //mac:".jnilib", windows:".dll" ,linux:".so" 40 | if (System.getProperty("os.name").toLowerCase().contains("mac")) { 41 | loadLib(directory, "libimagequant.jnilib"); 42 | } else if (System.getProperty("os.name").toLowerCase().contains("win")) { 43 | loadLib(directory, "libimagequant.dll"); 44 | } else if (System.getProperty("os.name").toLowerCase().contains("linux")) { 45 | loadLib(directory, "libimagequant.so"); 46 | } else { 47 | throw new RuntimeException("unsupported os for libimagequant!"); 48 | } 49 | } 50 | 51 | /** 52 | * load依赖 53 | * 54 | * @param directory 目录 55 | * @param libName 依赖名字 56 | * @throws IOException IO异常 57 | */ 58 | private static void loadLib(File directory, String libName) throws IOException { 59 | FileUtils.copyInputStreamToFile( 60 | getResourceAsStream(File.separator + "libimagequant" + File.separator + libName), 61 | new File(directory, libName)); 62 | System.load(directory.getPath() + File.separator + libName); 63 | } 64 | 65 | private static InputStream getResourceAsStream(String resource) { 66 | final InputStream in 67 | = getContextClassLoader().getResourceAsStream(resource); 68 | 69 | return in == null ? LiqObject.class.getResourceAsStream(resource) : in; 70 | } 71 | 72 | private static ClassLoader getContextClassLoader() { 73 | return Thread.currentThread().getContextClassLoader(); 74 | } 75 | 76 | /** 77 | * Free memory used by the library. The object must not be used after this call. 78 | */ 79 | abstract public void close(); 80 | 81 | @Override 82 | protected void finalize() { 83 | close(); 84 | } 85 | } 86 | -------------------------------------------------------------------------------- /src/main/java/org/pngquant/Result.java: -------------------------------------------------------------------------------- 1 | package org.pngquant; 2 | 3 | import java.awt.image.BufferedImage; 4 | import java.awt.image.DataBuffer; 5 | import java.awt.image.DataBufferByte; 6 | import java.awt.image.IndexColorModel; 7 | 8 | /** 9 | * Quantization result that holds palette and options for remapping. 10 | */ 11 | public class Result extends LiqObject { 12 | 13 | /** 14 | * Throws when quantization fails (e.g. due to failing to achieve minimum quality) 15 | */ 16 | public Result(PngQuant pngquant, Image image) throws PngQuantException { 17 | handle = liq_quantize_image(pngquant.handle, image.handle); 18 | if (handle == 0) { 19 | throw new PngQuantException(); 20 | } 21 | } 22 | 23 | private static byte[] get8bitDataFromImage(BufferedImage image) { 24 | if (image.getType() == BufferedImage.TYPE_BYTE_INDEXED) { 25 | DataBuffer buffer = image.getRaster().getDataBuffer(); 26 | if (buffer instanceof DataBufferByte) { 27 | return ((DataBufferByte) buffer).getData(); 28 | } 29 | } 30 | return null; 31 | } 32 | 33 | private static native byte[] liq_get_palette(long handle); 34 | 35 | private static native long liq_quantize_image(long attr, long image); 36 | 37 | private static native boolean liq_write_remapped_image(long handle, long image, byte[] buffer); 38 | 39 | private static native void liq_result_destroy(long handle); 40 | 41 | /** 42 | * @return BufferedImage remapped to palette this Result has been created with or null on failure. 43 | */ 44 | public BufferedImage getRemapped(Image orig_image) { 45 | byte[] pal = liq_get_palette(handle); 46 | IndexColorModel color = new IndexColorModel(8, pal.length / 4, pal, 0, true); 47 | BufferedImage img = new BufferedImage( 48 | orig_image.getWidth(), orig_image.getHeight(), 49 | BufferedImage.TYPE_BYTE_INDEXED, color); 50 | 51 | byte[] data = get8bitDataFromImage(img); 52 | if (data == null) { 53 | return null; 54 | } 55 | 56 | if (!liq_write_remapped_image(handle, orig_image.handle, data)) { 57 | return null; 58 | } 59 | 60 | return img; 61 | } 62 | 63 | /** 64 | * Dithering strength. Floyd-Steinberg is always used and in 65 | * speed settings 1-5 high-quality adaptive dithering is used. 66 | * 67 | * @param dither_level Dithering in range 0 (none) and 1 (full) 68 | * @link http://pngquant.org/lib/#liq_set_dithering_level 69 | * see PngQuant.setSpeed() 70 | */ 71 | public native boolean setDitheringLevel(float dither_level); 72 | 73 | /** 74 | * The default is 0.45455 (1/2.2) which is PNG's approximation of sRGB. 75 | */ 76 | public native boolean setGamma(double gamma); 77 | 78 | public native double getGamma(); 79 | 80 | /** 81 | * Mean Square Error of remapping of image used to create this result. 82 | * 83 | * @return MSE or -1 if not available 84 | * @link http://pngquant.org/lib/#liq_get_quantization_error 85 | */ 86 | public native double getMeanSquareError(); 87 | 88 | /** 89 | * @return Actually achieved quality in 0-100 range on scale compatible with PngQuant.setQuality() 90 | * @link http://pngquant.org/lib/#liq_get_quantization_quality 91 | */ 92 | public native int getQuality(); 93 | 94 | @Override 95 | public void close() { 96 | if (handle != 0) { 97 | liq_result_destroy(handle); 98 | handle = 0; 99 | } 100 | } 101 | } 102 | -------------------------------------------------------------------------------- /src/main/java/org/pngquant/PngQuant.java: -------------------------------------------------------------------------------- 1 | package org.pngquant; 2 | 3 | import java.awt.image.BufferedImage; 4 | 5 | /** 6 | * Starting point for the library. Holds configuration. Equivalent of liq_attr* in libimagequant. 7 | */ 8 | public class PngQuant extends LiqObject { 9 | 10 | /** 11 | * Single instance can be "recycled" for many remappings. 12 | */ 13 | public PngQuant() { 14 | handle = liq_attr_create(); 15 | } 16 | 17 | public PngQuant(PngQuant other) { 18 | handle = liq_attr_copy(other.handle); 19 | } 20 | 21 | private static native long liq_attr_create(); 22 | 23 | private static native long liq_attr_copy(long orig); 24 | 25 | private static native void liq_attr_destroy(long handle); 26 | 27 | /** 28 | * 1-shot quantization and remapping with current settings. 29 | * 30 | * @return 8-bit indexed image or null on failure 31 | * see quantize() 32 | */ 33 | public BufferedImage getRemapped(BufferedImage bufimg) { 34 | try { 35 | Image liqimg = new Image(this, bufimg); 36 | BufferedImage remapped = getRemapped(liqimg); 37 | liqimg.close(); 38 | return remapped; 39 | } catch (PngQuantException e) { 40 | return null; 41 | } 42 | } 43 | 44 | /** 45 | * @return remapped image or null on failure 46 | */ 47 | public BufferedImage getRemapped(Image liqimg) { 48 | Result result = quantize(liqimg); 49 | if (result == null) { 50 | return null; 51 | } 52 | BufferedImage remapped = result.getRemapped(liqimg); 53 | result.close(); 54 | return remapped; 55 | } 56 | 57 | /** 58 | * Performs quantization (chooses optimal palette for the given Image). 59 | * Returned object can be used to customize remapping and reused to remap other images to the same palette. 60 | * 61 | * @return null on failure 62 | * @link http://pngquant.org/lib/#liq_quantize_image 63 | */ 64 | public Result quantize(Image img) { 65 | try { 66 | return new Result(this, img); 67 | } catch (PngQuantException e) { 68 | return null; 69 | } 70 | } 71 | 72 | /** 73 | * Remapped images won't use more than given number of colors (may use less if setQuality() is used) 74 | * 75 | * @link http://pngquant.org/lib/#liq_set_max_colors 76 | */ 77 | public native boolean setMaxColors(int colors); 78 | 79 | /** 80 | * Equivalent of setQuality(target/2, target) 81 | * 82 | * @link http://pngquant.org/lib/#liq_set_quality 83 | */ 84 | public native boolean setQuality(int target); 85 | 86 | /** 87 | * Quality in range 0-100. Quantization will fail if minimum quality cannot 88 | * be achieved with given number of colors. 89 | * 90 | * @link http://pngquant.org/lib/#liq_set_quality 91 | */ 92 | public native boolean setQuality(int min, int max); 93 | 94 | /** 95 | * Speed in range 1 (slowest) and 11 (fastest). 3 is the optimum. 96 | * Higher speeds quantize quicker, but at cost of quality and sometimes larger images. 97 | * 98 | * @link http://pngquant.org/lib/#liq_set_speed 99 | */ 100 | public native boolean setSpeed(int speed); 101 | 102 | /** 103 | * Reduces color precision by truncating number of least significant bits. 104 | * Slightly improves speed and helps generating images for low-fidelity displays/textures. 105 | * 106 | * @link http://pngquant.org/lib/#liq_set_min_posterization 107 | */ 108 | public native boolean setMinPosterization(int bits); 109 | 110 | @Override 111 | public void close() { 112 | if (handle != 0) { 113 | liq_attr_destroy(handle); 114 | handle = 0; 115 | } 116 | } 117 | } 118 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## 🔨Java实现的 Png 图片压缩工具 2 | 3 | 本项目底层使用 [libimagequant](https://pngquant.org/lib/) 依赖库，使用java JNI调用实现对PNG图片进行压缩，压缩效果和目前在线的 TinyPNG 可以媲美，压缩率比例可以自己参数控制，默认参数可以使PNG格式图片压缩50%~70%左右，本项目已经打包好了windows、mac以及linux所需的依赖包。 4 | 5 | ### 项目结构 6 | 7 | ```shell 8 | —>java-png-compress-util 9 | ├─src 10 | │ ├─main 11 | │ │ ├─java 12 | │ │ │ ├─com 13 | │ │ │ │ └─biejieshi 14 | │ │ │ │ └─compress #工具类 15 | │ │ │ └─org 16 | │ │ │ └─pngquant #JNI方法 17 | │ │ └─resources 18 | │ │ └─libimagequant #libimagequant打包依赖 19 | │ └─test 20 | │ ├─java 21 | │ │ └─com 22 | │ │ └─biejieshi 23 | │ │ └─compress #测试用例 24 | │ └─resources #测试用例图片位置 25 | └─ 26 | ``` 27 | 28 | ### 压缩效果 29 | 30 | | 测试用例文件名 | 原文件大小 | 压缩后文件大小 | 压缩率 | 31 | | -------------- | ---------- | -------------- | ---------- | 32 | | test-1.png | 534.7 Kb | 218.05 Kb | **59.2 %** | 33 | | test-2.png | 103.61 Kb | 37.19 Kb | **64.1 %** | 34 | | test-3.png | 78.69 Kb | 33.07 Kb | **57.9 %** | 35 | | test-4.png | 2.77 Mb | 1.01 Mb | **63.5 %** | 36 | 37 | ### 使用步骤 38 | 39 | - 克隆本项目打包到本地或者公司私服,其他项目引入依赖 40 | 41 | ```xml 42 | com.biejieshi.compress 43 | java-png-compress-util 44 | 2022.1.0 45 | ``` 46 | 47 | - 使用压缩方法 48 | 49 | ```java 50 | /** 51 | * 测试Png压缩 52 | * 方法：PngCompressUtils.compressPng(BufferedImage bufferedImage) 53 | */ 54 | @Test 55 | public void testPngCompress() { 56 | String testFileName = "test-1.png"; 57 | InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(testFileName); 58 | try { 59 | ImageIO.write(PngCompressUtils.compressPng(ImageIO.read(inputStream)), "png", 60 | new FileOutputStream(testFileName.replace(".png", "") + "-compress-result.png")); 61 | } catch (IOException e) { 62 | e.printStackTrace(); 63 | } 64 | System.out.println("compress complete!"); 65 | } 66 | ``` 67 | 68 | ### libimagequant 自编译步骤 69 | 70 | - 下载源码包 71 | 72 | 下载地址：https://github.com/ImageOptim/libimagequant 73 | 74 | 源码是C编写的，java需要通过JNI（java native interface）来调用，不了解JNI的同学可自行百度，简单来讲，JNI就是java像调用本地方法一样调用用C写的代码。 75 | 76 | - **Linux 环境下编译** 77 | 78 | 1. 切换分支到当前稳定版本2.x，比如当前本项目编译的 2.17.0 79 | 80 | 2. Linux下安装java环境以及gcc环境，然后执行下面命令： 81 | 82 | ```shell 83 | make clean 84 | make distclean 85 | ./configure --extra-cflags="-fPIC" 86 | make java 87 | ``` 88 | 89 | > 编译完成后就有了 libimagequant.jnilib 文件，这个文件是macos上面用的。 90 | 91 | 3. 复制步骤2中`make java` 的时候输出的最后一个命令，修改 `libimagequant.jnilib` 为 `libimagequant.so`，然后执行命令，就会生成linux下可用的libimagequant.so，命令内容大概长下面这个样： 92 | 93 | ```shell 94 | gcc -g -fno-math-errno -funroll-loops -fomit-frame-pointer -Wall -std=c99 -I. -O3 -DNDEBUG -DUSE_SSE=1 -msse -mfpmath=sse -Wno-unknown-pragmas -fexcess-precision=fast -fPIC -lm -I'/usr/lib/jvm/java-1.8.0-openjdk/include' -I'/usr/lib/jvm/java-1.8.0-openjdk/include/linux' -I'/usr/lib/jvm/java-1.8.0-openjdk/include/win32' -I'/usr/lib/jvm/java-1.8.0-openjdk/include/darwin' -shared -o libimagequant.so org/pngquant/PngQuant.c libimagequant.a 95 | ``` 96 | 97 | - **Windows下编译** 98 | 99 | 1. 切换分支到当前稳定版本2.x，比如当前本项目编译的 2.17.0 100 | 101 | 2. 根据自己的电脑配置下载mingw-w64，对应地址：https://sourceforge.net/projects/mingw-w64/files/，将解压缩路径中bin配置到电脑的path环境变量中，并将bin目录下面的`mingw32-make.exe` 复制一份改为 `make.exe`。 102 | 103 | >- x86_64-posix-sjlj 104 | >- x86_64-posix-seh 105 | >- x86_64-win32-sjlj 106 | >- x86_64-win32-seh 107 | >- i686-posix-sjlj 108 | >- i686-posix-dwarf 109 | >- i686-win32-sjlj 110 | >- i686-win32-dwarf 111 | > 112 | >电脑系统是 64位的，选择 x86_64；如果是 32位 系统，则选择 i686 即可； 113 | > 114 | >如果你想要开发 Windows 程序，需要选择 win32 ，而开发 Linux、Unix、Mac OS 等其他操作系统下的程序，则需要选择 posix； 115 | > 116 | >异常处理在开发中非常重要，在开发的过程中，大部分的时间会耗在处理各种异常情况上。seh 是新发明的，而 sjlj 则是古老的。seh 性能比较好，但不支持 32位。 sjlj 稳定性好，支持 32位。建议64位操作系统选择seh。 117 | 118 | 3. 执行`make java-dll` 即可生成 libimagequant.dll 119 | 120 | **注意：** mac使用".jnilib"文件，windows使用".dll" 文件，linux使用".so"文件（本项目resources/libimagequant下提供了已经编译好的最新稳定版本2.17.0，可直接使用） 121 | 122 | ### 常见问题 123 | 124 | 1. %HOME%\Temp\libimagequant_temp\libimagequant.dll: %1 不是有效的 Win32 应用程序？ 125 | 126 | 解决办法：请确认是否有拷贝依赖包到C盘用户临时目录下的权限，程序执行前会先进行拷贝当前操作系统所需的依赖文件到用户临时目录下，详情代码参考：org.pngquant.LiqObject#loadLibrary()方法 127 | 128 | ```shell 129 | 正常操作日志会打印如下： 130 | load lib to path:C:\Users\lcry\AppData\Local\Temp\libimagequant_temp 131 | load libimagequant lib successful! 132 | compress complete! 133 | ``` 134 | 135 | 2. 压缩后没有效果？ 136 | 137 | 解决办法：本项目只能针对png图片的格式进行压缩，其他类型图片不支持，另针对有些很小的png图片压缩可能压缩无法达到测试用例中的比率，更多还请使用前自测。 138 | 139 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------