本文整理汇总了Java中javax.imageio.stream.ImageInputStream.mark方法的典型用法代码示例。如果您正苦于以下问题：Java ImageInputStream.mark方法的具体用法？Java ImageInputStream.mark怎么用？Java ImageInputStream.mark使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类javax.imageio.stream.ImageInputStream的用法示例。
在下文中一共展示了ImageInputStream.mark方法的10个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
public boolean canDecodeInput(Object input) throws IOException {
if (!(input instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)input;
byte[] b = new byte[4];
stream.mark();
stream.readFully(b);
stream.reset();
return ((b[0] == (byte)0x49 && b[1] == (byte)0x49 &&
b[2] == (byte)0x2a && b[3] == (byte)0x00) ||
(b[0] == (byte)0x4d && b[1] == (byte)0x4d &&
b[2] == (byte)0x00 && b[3] == (byte)0x2a));
}
示例2: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream iis = (ImageInputStream) source;
iis.mark();
// If the first two bytes are a JPEG SOI marker, it's probably
// a JPEG file. If they aren't, it definitely isn't a JPEG file.
int byte1 = iis.read();
int byte2 = iis.read();
iis.reset();
if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
return true;
}
return false;
}
示例3: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
public boolean canDecodeInput(Object input) throws IOException {
if (!(input instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)input;
byte[] b = new byte[8];
stream.mark();
stream.readFully(b);
stream.reset();
return (b[0] == (byte)137 &&
b[1] == (byte)80 &&
b[2] == (byte)78 &&
b[3] == (byte)71 &&
b[4] == (byte)13 &&
b[5] == (byte)10 &&
b[6] == (byte)26 &&
b[7] == (byte)10);
}
示例4: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
@Override
public boolean canDecodeInput(Object input) throws IOException {
loadLibrary();
if (!(input instanceof ImageInputStream)) {
input = ImageIO.createImageInputStream(input);
}
if (input == null) {
return false;
}
ImageInputStream stream = (ImageInputStream)input;
byte[] b = new byte[2];
try {
stream.mark();
stream.readFully(b);
} catch (IOException e) {
return false;
}
return Arrays.equals(b, HEADER_MAGIC);
}
示例5: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
public boolean canDecodeInput(Object input) throws IOException {
if (!(input instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)input;
byte[] b = new byte[6];
stream.mark();
stream.readFully(b);
stream.reset();
return b[0] == 'G' && b[1] == 'I' && b[2] == 'F' && b[3] == '8' &&
(b[4] == '7' || b[4] == '9') && b[5] == 'a';
}
示例6: getThumbnail
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
JPEGImageReader thumbReader = new JPEGImageReader(null);
thumbReader.setInput(iis);
thumbReader.addIIOReadProgressListener
(new ThumbnailReadListener(reader));
BufferedImage ret = thumbReader.read(0, null);
thumbReader.dispose();
iis.reset();
return ret;
}
示例7: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)source;
byte[] b = new byte[2];
stream.mark();
stream.readFully(b);
stream.reset();
return (b[0] == 0x42) && (b[1] == 0x4d);
}
示例8: getThumbnail
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
DataBufferByte buffer = new DataBufferByte(getLength());
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F,
0.0F);
iis.reset();
WritableRaster raster =
Raster.createInterleavedRaster(buffer,
thumbWidth,
thumbHeight,
thumbWidth*3,
3,
new int [] {0, 1, 2},
null);
ColorModel cm = new ComponentColorModel(JPEG.JCS.sRGB,
false,
false,
ColorModel.OPAQUE,
DataBuffer.TYPE_BYTE);
return new BufferedImage(cm,
raster,
false,
null);
}
示例9: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)source;
stream.mark();
try {
byte[] sig = new byte[4];
stream.read(sig);
return sig[0]=='S' && sig[1]=='I' && sig[2]=='M' && sig[3]=='P';
} finally {
stream.reset();
}
}
示例10: canDecodeInput
import javax.imageio.stream.ImageInputStream; //导入方法依赖的package包/类
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)source;
stream.mark();
try {
int type = stream.readByte(); // TypeField
int fixHeaderField = stream.readByte();
// check WBMP "header"
if (type != 0 || fixHeaderField != 0) {
// while WBMP reader does not support ext WBMP headers
return false;
}
int width = ReaderUtil.readMultiByteInteger(stream);
int height = ReaderUtil.readMultiByteInteger(stream);
// check image dimension
if (width <= 0 || height <= 0) {
return false;
}
long dataLength = stream.length();
if (dataLength == -1) {
// We can't verify that amount of data in the stream
// corresponds to image dimension because we do not know
// the length of the data stream.
// Assuming that wbmp image are used for mobile devices,
// let's introduce an upper limit for image dimension.
// In case if exact amount of raster data is unknown,
// let's reject images with dimension above the limit.
return (width < MAX_WBMP_WIDTH) && (height < MAX_WBMP_HEIGHT);
}
dataLength -= stream.getStreamPosition();
long scanSize = (width / 8) + ((width % 8) == 0 ? 0 : 1);
return (dataLength == scanSize * height);
} finally {
stream.reset();
}
}