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Add ANSI 8-bit color image banner support

Browse Source 
Update `ImageBanner` and `AnsiColors` to optionally support 8-bit
color output.

See gh-18264
pull/18321/head
Phillip Webb 5 years ago
parent 7f79c26b6b
commit 4ef1e18216
4 changed files with 187 additions and 54 deletions
Show Stats Download Patch File Download Diff File

16
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ImageBanner.java
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@ -37,6 +37,7 @@ import org.apache.commons.logging.LogFactory;
import org.springframework.boot.ansi.AnsiBackground; import org.springframework.boot.ansi.AnsiBackground;
import org.springframework.boot.ansi.AnsiColor; import org.springframework.boot.ansi.AnsiColor;
import org.springframework.boot.ansi.AnsiColors; import org.springframework.boot.ansi.AnsiColors;
import org.springframework.boot.ansi.AnsiColors.BitDepth;
import org.springframework.boot.ansi.AnsiElement; import org.springframework.boot.ansi.AnsiElement;
import org.springframework.boot.ansi.AnsiOutput; import org.springframework.boot.ansi.AnsiOutput;
import org.springframework.core.env.Environment; import org.springframework.core.env.Environment;
@ -102,16 +103,22 @@ public class ImageBanner implements Banner {
int height = getProperty(environment, "height", Integer.class, 0); int height = getProperty(environment, "height", Integer.class, 0);
int margin = getProperty(environment, "margin", Integer.class, 2); int margin = getProperty(environment, "margin", Integer.class, 2);
boolean invert = getProperty(environment, "invert", Boolean.class, false); boolean invert = getProperty(environment, "invert", Boolean.class, false);
BitDepth bitDepth = getBitDepthProperty(environment);
Frame[] frames = readFrames(width, height); Frame[] frames = readFrames(width, height);
for (int i = 0; i < frames.length; i++) { for (int i = 0; i < frames.length; i++) {
if (i > 0) { if (i > 0) {
resetCursor(frames[i - 1].getImage(), out); resetCursor(frames[i - 1].getImage(), out);
} }
printBanner(frames[i].getImage(), margin, invert, out); printBanner(frames[i].getImage(), margin, invert, bitDepth, out);
sleep(frames[i].getDelayTime()); sleep(frames[i].getDelayTime());
} }
} }
private BitDepth getBitDepthProperty(Environment environment) {
Integer bitDepth = getProperty(environment, "bitdepth", Integer.class, null);
return (bitDepth != null) ? BitDepth.of(bitDepth) : BitDepth.FOUR;
}
private <T> T getProperty(Environment environment, String name, Class<T> targetType, T defaultValue) { private <T> T getProperty(Environment environment, String name, Class<T> targetType, T defaultValue) {
return environment.getProperty(PROPERTY_PREFIX + name, targetType, defaultValue); return environment.getProperty(PROPERTY_PREFIX + name, targetType, defaultValue);
} }
@ -190,20 +197,21 @@ public class ImageBanner implements Banner {
out.print("\033[" + lines + "A\r"); out.print("\033[" + lines + "A\r");
} }
private void printBanner(BufferedImage image, int margin, boolean invert, PrintStream out) { private void printBanner(BufferedImage image, int margin, boolean invert, BitDepth bitDepth, PrintStream out) {
AnsiElement background = invert ? AnsiBackground.BLACK : AnsiBackground.DEFAULT; AnsiElement background = invert ? AnsiBackground.BLACK : AnsiBackground.DEFAULT;
out.print(AnsiOutput.encode(AnsiColor.DEFAULT)); out.print(AnsiOutput.encode(AnsiColor.DEFAULT));
out.print(AnsiOutput.encode(background)); out.print(AnsiOutput.encode(background));
out.println(); out.println();
out.println(); out.println();
AnsiColor lastColor = AnsiColor.DEFAULT; AnsiElement lastColor = AnsiColor.DEFAULT;
AnsiColors colors = new AnsiColors(bitDepth);
for (int y = 0; y < image.getHeight(); y++) { for (int y = 0; y < image.getHeight(); y++) {
for (int i = 0; i < margin; i++) { for (int i = 0; i < margin; i++) {
out.print(" "); out.print(" ");
} }
for (int x = 0; x < image.getWidth(); x++) { for (int x = 0; x < image.getWidth(); x++) {
Color color = new Color(image.getRGB(x, y), false); Color color = new Color(image.getRGB(x, y), false);
AnsiColor ansiColor = AnsiColors.getClosest(color); AnsiElement ansiColor = colors.findClosest(color);
if (ansiColor != lastColor) { if (ansiColor != lastColor) {
out.print(AnsiOutput.encode(ansiColor)); out.print(AnsiOutput.encode(ansiColor));
lastColor = ansiColor; lastColor = ansiColor;

124
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ansi/AnsiColors.java
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@ -20,8 +20,8 @@ import java.awt.Color;
import java.awt.color.ColorSpace; import java.awt.color.ColorSpace;
import java.util.Collections; import java.util.Collections;
import java.util.EnumMap; import java.util.EnumMap;
import java.util.LinkedHashMap;
import java.util.Map; import java.util.Map;
import java.util.Map.Entry;
import org.springframework.util.Assert; import org.springframework.util.Assert;
@ -36,7 +36,7 @@ import org.springframework.util.Assert;
*/ */
public final class AnsiColors { public final class AnsiColors {
private static final Map<AnsiColor, LabColor> ANSI_COLOR_MAP; private static final Map<AnsiElement, LabColor> ANSI_COLOR_MAP;
static { static {
Map<AnsiColor, LabColor> colorMap = new EnumMap<>(AnsiColor.class); Map<AnsiColor, LabColor> colorMap = new EnumMap<>(AnsiColor.class);
@ -59,24 +59,86 @@ public final class AnsiColors {
ANSI_COLOR_MAP = Collections.unmodifiableMap(colorMap); ANSI_COLOR_MAP = Collections.unmodifiableMap(colorMap);
} }
private AnsiColors() { private static final int[] ANSI_8BIT_COLOR_CODE_LOOKUP = new int[] { 0x000000, 0x800000, 0x008000, 0x808000,
0x000080, 0x800080, 0x008080, 0xc0c0c0, 0x808080, 0xff0000, 0x00ff00, 0xffff00, 0x0000ff, 0xff00ff,
0x00ffff, 0xffffff, 0x000000, 0x00005f, 0x000087, 0x0000af, 0x0000d7, 0x0000ff, 0x005f00, 0x005f5f,
0x005f87, 0x005faf, 0x005fd7, 0x005fff, 0x008700, 0x00875f, 0x008787, 0x0087af, 0x0087d7, 0x0087ff,
0x00af00, 0x00af5f, 0x00af87, 0x00afaf, 0x00afd7, 0x00afff, 0x00d700, 0x00d75f, 0x00d787, 0x00d7af,
0x00d7d7, 0x00d7ff, 0x00ff00, 0x00ff5f, 0x00ff87, 0x00ffaf, 0x00ffd7, 0x00ffff, 0x5f0000, 0x5f005f,
0x5f0087, 0x5f00af, 0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87, 0x5f5faf, 0x5f5fd7, 0x5f5fff,
0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff, 0x5faf00, 0x5faf5f, 0x5faf87, 0x5fafaf,
0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787, 0x5fd7af, 0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f,
0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff, 0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff,
0x875f00, 0x875f5f, 0x875f87, 0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af,
0x8787d7, 0x8787ff, 0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff, 0x87d700, 0x87d75f,
0x87d787, 0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f, 0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff,
0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af, 0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87, 0xaf5faf,
0xaf5fd7, 0xaf5fff, 0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff, 0xafaf00, 0xafaf5f,
0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787, 0xafd7af, 0xafd7d7, 0xafd7ff,
0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff, 0xd70000, 0xd7005f, 0xd70087, 0xd700af,
0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f, 0xd75f87, 0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f,
0xd78787, 0xd787af, 0xd787d7, 0xd787ff, 0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff,
0xd7d700, 0xd7d75f, 0xd7d787, 0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f, 0xd7ff87, 0xd7ffaf,
0xd7ffd7, 0xd7ffff, 0xff0000, 0xff005f, 0xff0087, 0xff00af, 0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f,
0xff5f87, 0xff5faf, 0xff5fd7, 0xff5fff, 0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff,
0xffaf00, 0xffaf5f, 0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787, 0xffd7af,
0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff, 0x080808, 0x121212,
0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e, 0x585858, 0x626262, 0x6c6c6c, 0x767676,
0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e, 0xa8a8a8, 0xb2b2b2, 0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada,
0xe4e4e4, 0xeeeeee };
private final Map<AnsiElement, LabColor> lookup;
/**
* Create a new {@link AnsiColors} instance with the specified bit depth.
* @param bitDepth the required bit depth
*/
public AnsiColors(BitDepth bitDepth) {
this.lookup = getLookup(bitDepth);
} }
public static AnsiColor getClosest(Color color) { private Map<AnsiElement, LabColor> getLookup(BitDepth bitDepth) {
return getClosest(new LabColor(color)); if (bitDepth == BitDepth.EIGHT) {
Map<Ansi8BitColor, LabColor> lookup = new LinkedHashMap<>();
for (int i = 0; i < ANSI_8BIT_COLOR_CODE_LOOKUP.length; i++) {
lookup.put(Ansi8BitColor.foreground(i), new LabColor(ANSI_8BIT_COLOR_CODE_LOOKUP[i]));
}
return Collections.unmodifiableMap(lookup);
}
return ANSI_COLOR_MAP;
} }
private static AnsiColor getClosest(LabColor color) { /**
AnsiColor result = null; * Find the closest {@link AnsiElement ANSI color} to the given AWT {@link Color}.
double resultDistance = Float.MAX_VALUE; * @param color the AWT color
for (Entry<AnsiColor, LabColor> entry : ANSI_COLOR_MAP.entrySet()) { * @return the closest ANSI color
double distance = color.getDistance(entry.getValue()); */
if (result == null || distance < resultDistance) { public AnsiElement findClosest(Color color) {
resultDistance = distance; return findClosest(new LabColor(color));
result = entry.getKey();
} }
private AnsiElement findClosest(LabColor color) {
AnsiElement closest = null;
double closestDistance = Float.MAX_VALUE;
for (Map.Entry<AnsiElement, LabColor> entry : this.lookup.entrySet()) {
double candidateDistance = color.getDistance(entry.getValue());
if (closest == null || candidateDistance < closestDistance) {
closestDistance = candidateDistance;
closest = entry.getKey();
} }
return result; }
return closest;
}
/**
* Get the closest {@link AnsiColor ANSI color} to the given AWT {@link Color}.
* @param color the color to find
* @return the closest color
* @deprecated since 2.2.0 in favor of {@link #findClosest(Color)}
*/
@Deprecated
public static AnsiColor getClosest(Color color) {
return (AnsiColor) new AnsiColors(BitDepth.FOUR).findClosest(color);
} }
/** /**
@ -132,4 +194,38 @@ public final class AnsiColors {
} }
/**
* Bit depths supported by this class.
*/
public enum BitDepth {
/**
* 4 bits (16 color).
* @see AnsiColor
*/
FOUR(4),
/**
* 8 bits (256 color).
* @see Ansi8BitColor
*/
EIGHT(8);
private final int bits;
BitDepth(int bits) {
this.bits = bits;
}
public static BitDepth of(int bits) {
for (BitDepth candidate : values()) {
if (candidate.bits == bits) {
return candidate;
}
}
throw new IllegalArgumentException("Unsupported ANSI bit depth '" + bits + "'");
}
}
} }

100
spring-boot-project/spring-boot/src/test/java/org/springframework/boot/ansi/AnsiColorsTests.java
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@ -20,6 +20,8 @@ import java.awt.Color;
import org.junit.jupiter.api.Test; import org.junit.jupiter.api.Test;
import org.springframework.boot.ansi.AnsiColors.BitDepth;
import static org.assertj.core.api.Assertions.assertThat; import static org.assertj.core.api.Assertions.assertThat;
/** /**
@ -30,47 +32,73 @@ import static org.assertj.core.api.Assertions.assertThat;
class AnsiColorsTests { class AnsiColorsTests {
@Test @Test
void getClosestWhenExactMatchShouldReturnAnsiColor() { void findClosest4BitWhenExactMatchShouldReturnAnsiColor() {
assertThat(getClosest(0x000000)).isEqualTo(AnsiColor.BLACK); assertThat(findClosest4Bit(0x000000)).isEqualTo(AnsiColor.BLACK);
assertThat(getClosest(0xAA0000)).isEqualTo(AnsiColor.RED); assertThat(findClosest4Bit(0xAA0000)).isEqualTo(AnsiColor.RED);
assertThat(getClosest(0x00AA00)).isEqualTo(AnsiColor.GREEN); assertThat(findClosest4Bit(0x00AA00)).isEqualTo(AnsiColor.GREEN);
assertThat(getClosest(0xAA5500)).isEqualTo(AnsiColor.YELLOW); assertThat(findClosest4Bit(0xAA5500)).isEqualTo(AnsiColor.YELLOW);
assertThat(getClosest(0x0000AA)).isEqualTo(AnsiColor.BLUE); assertThat(findClosest4Bit(0x0000AA)).isEqualTo(AnsiColor.BLUE);
assertThat(getClosest(0xAA00AA)).isEqualTo(AnsiColor.MAGENTA); assertThat(findClosest4Bit(0xAA00AA)).isEqualTo(AnsiColor.MAGENTA);
assertThat(getClosest(0x00AAAA)).isEqualTo(AnsiColor.CYAN); assertThat(findClosest4Bit(0x00AAAA)).isEqualTo(AnsiColor.CYAN);
assertThat(getClosest(0xAAAAAA)).isEqualTo(AnsiColor.WHITE); assertThat(findClosest4Bit(0xAAAAAA)).isEqualTo(AnsiColor.WHITE);
assertThat(getClosest(0x555555)).isEqualTo(AnsiColor.BRIGHT_BLACK); assertThat(findClosest4Bit(0x555555)).isEqualTo(AnsiColor.BRIGHT_BLACK);
assertThat(getClosest(0xFF5555)).isEqualTo(AnsiColor.BRIGHT_RED); assertThat(findClosest4Bit(0xFF5555)).isEqualTo(AnsiColor.BRIGHT_RED);
assertThat(getClosest(0x55FF00)).isEqualTo(AnsiColor.BRIGHT_GREEN); assertThat(findClosest4Bit(0x55FF00)).isEqualTo(AnsiColor.BRIGHT_GREEN);
assertThat(getClosest(0xFFFF55)).isEqualTo(AnsiColor.BRIGHT_YELLOW); assertThat(findClosest4Bit(0xFFFF55)).isEqualTo(AnsiColor.BRIGHT_YELLOW);
assertThat(getClosest(0x5555FF)).isEqualTo(AnsiColor.BRIGHT_BLUE); assertThat(findClosest4Bit(0x5555FF)).isEqualTo(AnsiColor.BRIGHT_BLUE);
assertThat(getClosest(0xFF55FF)).isEqualTo(AnsiColor.BRIGHT_MAGENTA); assertThat(findClosest4Bit(0xFF55FF)).isEqualTo(AnsiColor.BRIGHT_MAGENTA);
assertThat(getClosest(0x55FFFF)).isEqualTo(AnsiColor.BRIGHT_CYAN); assertThat(findClosest4Bit(0x55FFFF)).isEqualTo(AnsiColor.BRIGHT_CYAN);
assertThat(getClosest(0xFFFFFF)).isEqualTo(AnsiColor.BRIGHT_WHITE); assertThat(findClosest4Bit(0xFFFFFF)).isEqualTo(AnsiColor.BRIGHT_WHITE);
}
@Test
void getClosest4BitWhenCloseShouldReturnAnsiColor() {
assertThat(findClosest4Bit(0x292424)).isEqualTo(AnsiColor.BLACK);
assertThat(findClosest4Bit(0x8C1919)).isEqualTo(AnsiColor.RED);
assertThat(findClosest4Bit(0x0BA10B)).isEqualTo(AnsiColor.GREEN);
assertThat(findClosest4Bit(0xB55F09)).isEqualTo(AnsiColor.YELLOW);
assertThat(findClosest4Bit(0x0B0BA1)).isEqualTo(AnsiColor.BLUE);
assertThat(findClosest4Bit(0xA312A3)).isEqualTo(AnsiColor.MAGENTA);
assertThat(findClosest4Bit(0x0BB5B5)).isEqualTo(AnsiColor.CYAN);
assertThat(findClosest4Bit(0xBAB6B6)).isEqualTo(AnsiColor.WHITE);
assertThat(findClosest4Bit(0x615A5A)).isEqualTo(AnsiColor.BRIGHT_BLACK);
assertThat(findClosest4Bit(0xF23333)).isEqualTo(AnsiColor.BRIGHT_RED);
assertThat(findClosest4Bit(0x55E80C)).isEqualTo(AnsiColor.BRIGHT_GREEN);
assertThat(findClosest4Bit(0xF5F54C)).isEqualTo(AnsiColor.BRIGHT_YELLOW);
assertThat(findClosest4Bit(0x5656F0)).isEqualTo(AnsiColor.BRIGHT_BLUE);
assertThat(findClosest4Bit(0xFA50FA)).isEqualTo(AnsiColor.BRIGHT_MAGENTA);
assertThat(findClosest4Bit(0x56F5F5)).isEqualTo(AnsiColor.BRIGHT_CYAN);
assertThat(findClosest4Bit(0xEDF5F5)).isEqualTo(AnsiColor.BRIGHT_WHITE);
} }
@Test @Test
void getClosestWhenCloseShouldReturnAnsiColor() { void findClosest8BitWhenExactMatchShouldReturnAnsiColor() {
assertThat(getClosest(0x292424)).isEqualTo(AnsiColor.BLACK); assertThat(findClosest8Bit(0x000000)).isEqualTo(Ansi8BitColor.foreground(0));
assertThat(getClosest(0x8C1919)).isEqualTo(AnsiColor.RED); assertThat(findClosest8Bit(0xFFFFFF)).isEqualTo(Ansi8BitColor.foreground(15));
assertThat(getClosest(0x0BA10B)).isEqualTo(AnsiColor.GREEN); assertThat(findClosest8Bit(0xFF00FF)).isEqualTo(Ansi8BitColor.foreground(13));
assertThat(getClosest(0xB55F09)).isEqualTo(AnsiColor.YELLOW); assertThat(findClosest8Bit(0x008700)).isEqualTo(Ansi8BitColor.foreground(28));
assertThat(getClosest(0x0B0BA1)).isEqualTo(AnsiColor.BLUE); assertThat(findClosest8Bit(0xAF8700)).isEqualTo(Ansi8BitColor.foreground(136));
assertThat(getClosest(0xA312A3)).isEqualTo(AnsiColor.MAGENTA); }
assertThat(getClosest(0x0BB5B5)).isEqualTo(AnsiColor.CYAN);
assertThat(getClosest(0xBAB6B6)).isEqualTo(AnsiColor.WHITE); @Test
assertThat(getClosest(0x615A5A)).isEqualTo(AnsiColor.BRIGHT_BLACK); void getClosest8BitWhenCloseShouldReturnAnsiColor() {
assertThat(getClosest(0xF23333)).isEqualTo(AnsiColor.BRIGHT_RED); assertThat(findClosest8Bit(0x000001)).isEqualTo(Ansi8BitColor.foreground(0));
assertThat(getClosest(0x55E80C)).isEqualTo(AnsiColor.BRIGHT_GREEN); assertThat(findClosest8Bit(0xFFFFFE)).isEqualTo(Ansi8BitColor.foreground(15));
assertThat(getClosest(0xF5F54C)).isEqualTo(AnsiColor.BRIGHT_YELLOW); assertThat(findClosest8Bit(0xFF00FE)).isEqualTo(Ansi8BitColor.foreground(13));
assertThat(getClosest(0x5656F0)).isEqualTo(AnsiColor.BRIGHT_BLUE); assertThat(findClosest8Bit(0x008701)).isEqualTo(Ansi8BitColor.foreground(28));
assertThat(getClosest(0xFA50FA)).isEqualTo(AnsiColor.BRIGHT_MAGENTA); assertThat(findClosest8Bit(0xAF8701)).isEqualTo(Ansi8BitColor.foreground(136));
assertThat(getClosest(0x56F5F5)).isEqualTo(AnsiColor.BRIGHT_CYAN); }
assertThat(getClosest(0xEDF5F5)).isEqualTo(AnsiColor.BRIGHT_WHITE);
private AnsiElement findClosest4Bit(int rgb) {
return findClosest(BitDepth.FOUR, rgb);
}
private AnsiElement findClosest8Bit(int rgb) {
return findClosest(BitDepth.EIGHT, rgb);
} }
private AnsiColor getClosest(int rgb) { private AnsiElement findClosest(BitDepth depth, int rgb) {
return AnsiColors.getClosest(new Color(rgb)); return new AnsiColors(depth).findClosest(new Color(rgb));
} }
} }

1
spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-simple/src/main/resources/application.properties
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@ -1,3 +1,4 @@
name=Phil name=Phil
sample.name=Andy sample.name=Andy
spring.banner.image.bitdepth=8

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