imagedata.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

			if ((theByte & mask) == 0) {
				pixels[i] = 0;
			} else {
				pixels[i] = 1;
			}
			i++;
			n--;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				if (n > 0) theByte = data[index] & 0xFF;
				srcX = 0;
			} else {
				if (mask == 1) {
					index++;
					if (n > 0) theByte = data[index] & 0xFF;
				}
			}
		}
		return;
	}		
	if (depth == 2) {
		index = (y * bytesPerLine) + (x >> 2);
		theByte = data[index] & 0xFF;
		int offset;
		while (n > 0) {
			offset = 3 - (srcX % 4);
			mask = 3 << (offset * 2);
			pixels[i] = (byte)((theByte & mask) >> (offset * 2));
			i++;
			n--;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				if (n > 0) theByte = data[index] & 0xFF;
				srcX = 0;
			} else {
				if (offset == 0) {
					index++;
					theByte = data[index] & 0xFF;
				}
			}
		}
		return;
	}
	if (depth == 4) {
		index = (y * bytesPerLine) + (x >> 1);
		if ((x & 0x1) == 1) {
			theByte = data[index] & 0xFF;
			pixels[i] = theByte & 0x0F;
			i++;
			n--;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				srcX = 0;
			} else {
				index++;
			}
		}
		while (n > 1) {
			theByte = data[index] & 0xFF;
			pixels[i] = theByte >> 4;
			i++;
			n--;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				srcX = 0;
			} else {
				pixels[i] = theByte & 0x0F;
				i++;
				n--;
				srcX++;
				if (srcX >= width) {
					srcY++;
					index = srcY * bytesPerLine;
					srcX = 0;
				} else {
					index++;
				}
			}
		}
		if (n > 0) {
			theByte = data[index] & 0xFF;
			pixels[i] = theByte >> 4;
		}
		return;
	}
	if (depth == 8) {
		index = (y * bytesPerLine) + x;
		for (int j = 0; j < getWidth; j++) {
			pixels[i] = data[index] & 0xFF;
			i++;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				srcX = 0;
			} else {
				index++;
			}
		}
		return;
	}
	if (depth == 16) {
		index = (y * bytesPerLine) + (x * 2);
		for (int j = 0; j < getWidth; j++) {
			pixels[i] = ((data[index+1] & 0xFF) << 8) + (data[index] & 0xFF);
			i++;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				srcX = 0;
			} else {
				index += 2;
			}
		}
		return;
	}
	if (depth == 24) {
		index = (y * bytesPerLine) + (x * 3);
		for (int j = 0; j < getWidth; j++) {
			pixels[i] = ((data[index] & 0xFF) << 16) | ((data[index+1] & 0xFF) << 8)
				| (data[index+2] & 0xFF);
			i++;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				srcX = 0;
			} else {
				index += 3;
			}
		}
		return;
	}
	if (depth == 32) {
		index = (y * bytesPerLine) + (x * 4);
		i = startIndex;
		for (int j = 0; j < getWidth; j++) {
			pixels[i] = ((data[index] & 0xFF) << 24) | ((data[index+1] & 0xFF) << 16)
				| ((data[index+2] & 0xFF) << 8) | (data[index+3] & 0xFF);
			i++;
			srcX++;
			if (srcX >= width) {
				srcY++;
				index = srcY * bytesPerLine;
				srcX = 0;
			} else {
				index += 4;
			}
		}
		return;
	}
	SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
}

/**
 * Returns an array of <code>RGB</code>s which comprise the
 * indexed color table of the receiver, or null if the receiver
 * has a direct color model.
 *
 * @return the RGB values for the image or null if direct color
 *
 * @see PaletteData#getRGBs()
 */
public RGB[] getRGBs() {
	return palette.getRGBs();
}

/**
 * Returns an <code>ImageData</code> which specifies the
 * transparency mask information for the receiver, or null if the
 * receiver has no transparency and is not an icon.
 *
 * @return the transparency mask or null if none exists
 */
public ImageData getTransparencyMask() {
	if (getTransparencyType() == SWT.TRANSPARENCY_MASK) {
		return new ImageData(width, height, 1, bwPalette(), maskPad, maskData);
	} else {
		return colorMaskImage(transparentPixel);
	}
}

/**
 * Returns the image transparency type.
 *
 * @return the receiver's transparency type
 */
public int getTransparencyType() {
	if (maskData != null) return SWT.TRANSPARENCY_MASK;
	if (transparentPixel != -1) return SWT.TRANSPARENCY_PIXEL;
	if (alphaData != null) return SWT.TRANSPARENCY_ALPHA;
	return SWT.TRANSPARENCY_NONE;
}

/**
 * Returns the byte order of the receiver.
 * 
 * @return MSB_FIRST or LSB_FIRST
 */
int getByteOrder() {
	return depth != 16 ? MSB_FIRST : LSB_FIRST;
}

/**
 * Returns a copy of the receiver which has been stretched or
 * shrunk to the specified size. If either the width or height
 * is negative, the resulting image will be inverted in the
 * associated axis.
 *
 * @param width the width of the new ImageData
 * @param height the height of the new ImageData
 * @return a scaled copy of the image
 */
public ImageData scaledTo(int width, int height) {
	/* Create a destination image with no data */
	final boolean flipX = (width < 0);
	if (flipX) width = - width;
	final boolean flipY = (height < 0);
	if (flipY) height = - height;

	ImageData dest = new ImageData(
		width, height, depth, palette,
		scanlinePad, null, 0, null,
		null, -1, transparentPixel, type,
		x, y, disposalMethod, delayTime);

	/* Scale the image contents */
	if (palette.isDirect) blit(BLIT_SRC,
		this.data, this.depth, this.bytesPerLine, this.getByteOrder(), 0, 0, this.width, this.height, 0, 0, 0,
		ALPHA_OPAQUE, null, 0, 0, 0,
		dest.data, dest.depth, dest.bytesPerLine, dest.getByteOrder(), 0, 0, dest.width, dest.height, 0, 0, 0,
		flipX, flipY);
	else blit(BLIT_SRC,
		this.data, this.depth, this.bytesPerLine, this.getByteOrder(), 0, 0, this.width, this.height, null, null, null,
		ALPHA_OPAQUE, null, 0, 0, 0,
		dest.data, dest.depth, dest.bytesPerLine, dest.getByteOrder(), 0, 0, dest.width, dest.height, null, null, null,
		flipX, flipY);
	
	/* Scale the image mask or alpha */
	if (maskData != null) {
		dest.maskPad = this.maskPad;
		int destBpl = (dest.width + 7) / 8;
		destBpl = (destBpl + (dest.maskPad - 1)) / dest.maskPad * dest.maskPad;
		dest.maskData = new byte[destBpl * dest.height];
		int srcBpl = (this.width + 7) / 8;
		srcBpl = (srcBpl + (this.maskPad - 1)) / this.maskPad * this.maskPad;
		blit(BLIT_SRC,
			this.maskData, 1, srcBpl, MSB_FIRST, 0, 0, this.width, this.height, null, null, null,
			ALPHA_OPAQUE, null, 0, 0, 0,
			dest.maskData, 1, destBpl, MSB_FIRST, 0, 0, dest.width, dest.height, null, null, null,
			flipX, flipY);
	} else if (alpha != -1) {
		dest.alpha = this.alpha;
	} else if (alphaData != null) {
		dest.alphaData = new byte[dest.width * dest.height];
		blit(BLIT_SRC,
			this.alphaData, 8, this.width, MSB_FIRST, 0, 0, this.width, this.height, null, null, null,
			ALPHA_OPAQUE, null, 0, 0, 0,
			dest.alphaData, 8, dest.width, MSB_FIRST, 0, 0, dest.width, dest.height, null, null, null,
			flipX, flipY);
	}
	return dest;
}

/**
 * Sets the alpha value at offset <code>x</code> in
 * scanline <code>y</code> in the receiver's alpha data.
 *
 * @param x the x coordinate of the alpha value to set
 * @param y the y coordinate of the alpha value to set
 * @param alpha the value to set the alpha to
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if x or y is out of bounds</li>
 *  </ul>
 */
public void setAlpha(int x, int y, int alpha) {
	if (x >= width || y >= height || x < 0 || y < 0 || alpha < 0 || alpha > 255)
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	
	if (alphaData == null) alphaData = new byte[width * height];
	alphaData[y * width + x] = (byte)alpha;	
}

/**
 * Sets the alpha values starting at offset <code>x</code> in
 * scanline <code>y</code> in the receiver's alpha data to the
 * values from the array <code>alphas</code> starting at
 * <code>startIndex</code>.
 *
 * @param x the x coordinate of the pixel to being setting the alpha values
 * @param y the y coordinate of the pixel to being setting the alpha values
 * @param putWidth the width of the alpha values to set
 * @param alphas the alpha values to set
 * @param startIndex the index at which to begin setting
 *
 * @exception IndexOutOfBoundsException if putWidth is too large
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if pixels is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if x or y is out of bounds</li>
 *    <li>ERROR_INVALID_ARGUMENT - if putWidth is negative</li>
 * </ul>
 */
public void setAlphas(int x, int y, int putWidth, byte[] alphas, int startIndex) {
	if (alphas == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	if (putWidth < 0 || x >= width || y >= height || x < 0 || y < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	if (putWidth == 0) return;
	
	if (alphaData == null) alphaData = new byte[width * height];
	// may throw an IndexOutOfBoundsException
	System.arraycopy(alphas, startIndex, alphaData, y * width + x, putWidth);
}

/**
 * Sets the pixel value at offset <code>x</code> in
 * scanline <code>y</code> in the receiver's data.
 *
 * @param x the x coordinate of the pixel to set
 * @param y the y coordinate of the pixel to set
 * @param pixelValue the value to set the pixel to
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if x or y is out of bounds</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_UNSUPPORTED_DEPTH if the depth is not one of 1, 2, 4, 8, 16, 24 or 32</li>
 * </ul>
 */
public void setPixel(int x, int y, int pixelValue) {
	if (x >= width || y >= height || x < 0 || y < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	int index;
	byte theByte;
	int mask;
	if (depth == 1) {
		index = (y * bytesPerLine) + (x >> 3);
		theByte = data[index];
		mask = 1 << (7 - (x & 0x7));
		if ((pixelValue & 0x1) == 1) {
			data[index] = (byte)(theByte | mask);
		} else {
			data[index] = (byte)(theByte & (mask ^ -1));
		}
		return;
	}
	if (depth == 2) {
		index = (y * bytesPerLine) + (x >> 2);
		theByte = data[index];
		int offset = 3 - (x % 4);
		mask = 0xFF ^ (3 << (offset * 2));
		data[index] = (byte)((data[index] & mask) | (pixelValue << (offset * 2)));
		return;
	}
	if (depth == 4) {
		index = (y * bytesPerLine) + (x >> 1);
		if ((x & 0x1) == 0) {
			data[index] = (byte)((data[index] & 0x0F) | ((pixelValue & 0x0F) << 4));
		} else {
			data[index] = (byte)((data[index] & 0xF0) | (pixelValue & 0x0F));
		}
		return;
	}
	if (depth == 8) {
		index = (y * bytesPerLine) + x ;
		data[index] = (byte)(pixelValue & 0xFF);
		return;
	}
	if (depth == 16) {
		index = (y * bytesPerLine) + (x * 2);
		data[index + 1] = (byte)((pixelValue >> 8) & 0xFF);
		data[index] = (byte)(pixelValue & 0xFF);
		return;
	}
	if (depth == 24) {
		index = (y * bytesPerLine) + (x * 3);
		data[index] = (byte)((pixelValue >> 16) & 0xFF);
		data[index + 1] = (byte)((pixelValue >> 8) & 0xFF);
		data[index + 2] = (byte)(pixelValue & 0xFF);
		return;
	}
	if (depth == 32) {
		index = (y * bytesPerLine) + (x * 4);
		data[index]  = (byte)((pixelValue >> 24) & 0xFF);
		data[index + 1] = (byte)((pixelValue >> 16) & 0xFF);
		data[index + 2] = (byte)((pixelValue >> 8) & 0xFF);
		data[index + 3] = (byte)(pixelValue & 0xFF);
		return;
	}
	SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
}

/**
 * Sets the pixel values starting at offset <code>x</code> in
 * scanline <code>y</code> in the receiver's data to the
 * values from the array <code>pixels</code> starting at
 * <code>startIndex</code>.
 *
 * @param x the x position of the pixel to set
 * @param y the y position of the pixel to set
 * @param putWidth the width of the pixels to set
 * @param pixels the pixels to set
 * @param startIndex the index at which to begin setting
 *
 * @exception IndexOutOfBoundsException if putWidth is too large
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if pixels is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if x or y is out of bounds</li>
 *    <li>ERROR_INVALID_ARGUMENT - if putWidth is negative</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_UNSUPPORTED_DEPTH if the depth is not one of 1, 2, 4, 8
 *        (For higher depths, use the int[] version of this method.)</li>
 * </ul>
 */
public void setPixels(int x, int y, int putWidth, byte[] pixels, int startIndex) {
	if (pixels == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	if (putWidth < 0 || x >= width || y >= height || x < 0 || y < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	if (putWidth == 0) return;
	int index;