Mercurial > projects > dwt-win
view dwt/internal/image/OS2BMPFileFormat.d @ 48:9a64a7781bab
Added override and alias, first chunk. Thanks torhu for doing this patch.
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 03 Feb 2008 01:14:54 +0100 |
parents | 92c102dd64a3 |
children | 41dbc4d9faab |
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/******************************************************************************* * Copyright (c) 2000, 2005 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.internal.image.OS2BMPFileFormat; import dwt.DWT; import dwt.graphics.ImageData; import dwt.graphics.ImageLoader; import dwt.graphics.PaletteData; import dwt.graphics.RGB; import dwt.internal.image.LEDataInputStream; import dwt.internal.image.FileFormat; import dwt.dwthelper.ByteArrayOutputStream; import tango.core.Exception; import dwt.dwthelper.System; final class OS2BMPFileFormat : FileFormat { static final int BMPFileHeaderSize = 14; static final int BMPHeaderFixedSize = 12; int width, height, bitCount; override bool isFileFormat(LEDataInputStream stream) { try { byte[] header = new byte[18]; stream.read(header); stream.unread(header); int infoHeaderSize = (header[14] & 0xFF) | ((header[15] & 0xFF) << 8) | ((header[16] & 0xFF) << 16) | ((header[17] & 0xFF) << 24); return header[0] is 0x42 && header[1] is 0x4D && infoHeaderSize is BMPHeaderFixedSize; } catch (TracedException e) { return false; } } byte[] loadData(byte[] infoHeader) { int stride = (width * bitCount + 7) / 8; stride = (stride + 3) / 4 * 4; // Round up to 4 byte multiple byte[] data = loadData(infoHeader, stride); flipScanLines(data, stride, height); return data; } byte[] loadData(byte[] infoHeader, int stride) { int dataSize = height * stride; byte[] data = new byte[dataSize]; try { if (inputStream.read(data) !is dataSize) DWT.error(DWT.ERROR_INVALID_IMAGE); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } return data; } int[] loadFileHeader() { int[] header = new int[5]; try { header[0] = inputStream.readShort(); header[1] = inputStream.readInt(); header[2] = inputStream.readShort(); header[3] = inputStream.readShort(); header[4] = inputStream.readInt(); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } if (header[0] !is 0x4D42) DWT.error(DWT.ERROR_INVALID_IMAGE); return header; } override ImageData[] loadFromByteStream() { int[] fileHeader = loadFileHeader(); byte[] infoHeader = new byte[BMPHeaderFixedSize]; try { inputStream.read(infoHeader); } catch (TracedException e) { DWT.error(DWT.ERROR_IO, e); } width = (infoHeader[4] & 0xFF) | ((infoHeader[5] & 0xFF) << 8); height = (infoHeader[6] & 0xFF) | ((infoHeader[7] & 0xFF) << 8); bitCount = (infoHeader[10] & 0xFF) | ((infoHeader[11] & 0xFF) << 8); PaletteData palette = loadPalette(infoHeader); if (inputStream.getPosition() < fileHeader[4]) { // Seek to the specified offset try { inputStream.skip(fileHeader[4] - inputStream.getPosition()); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } } byte[] data = loadData(infoHeader); int type = DWT.IMAGE_OS2_BMP; return [ ImageData.internal_new( width, height, bitCount, palette, 4, data, 0, null, null, -1, -1, type, 0, 0, 0, 0) ]; } PaletteData loadPalette(byte[] infoHeader) { if (bitCount <= 8) { int numColors = 1 << bitCount; byte[] buf = new byte[numColors * 3]; try { if (inputStream.read(buf) !is buf.length) DWT.error(DWT.ERROR_INVALID_IMAGE); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } return paletteFromBytes(buf, numColors); } if (bitCount is 16) return new PaletteData(0x7C00, 0x3E0, 0x1F); if (bitCount is 24) return new PaletteData(0xFF, 0xFF00, 0xFF0000); return new PaletteData(0xFF00, 0xFF0000, 0xFF000000); } PaletteData paletteFromBytes(byte[] bytes, int numColors) { int bytesOffset = 0; RGB[] colors = new RGB[numColors]; for (int i = 0; i < numColors; i++) { colors[i] = new RGB(bytes[bytesOffset + 2] & 0xFF, bytes[bytesOffset + 1] & 0xFF, bytes[bytesOffset] & 0xFF); bytesOffset += 3; } return new PaletteData(colors); } /** * Answer a byte array containing the BMP representation of * the given device independent palette. */ static byte[] paletteToBytes(PaletteData pal) { int n = pal.colors is null ? 0 : (pal.colors.length < 256 ? pal.colors.length : 256); byte[] bytes = new byte[n * 3]; int offset = 0; for (int i = 0; i < n; i++) { RGB col = pal.colors[i]; bytes[offset] = cast(byte)col.blue; bytes[offset + 1] = cast(byte)col.green; bytes[offset + 2] = cast(byte)col.red; offset += 3; } return bytes; } /** * Unload the given image's data into the given byte stream. * Answer the number of bytes written. */ int unloadData(ImageData image, OutputStream ostr) { int bmpBpl = 0; try { int bpl = (image.width * image.depth + 7) / 8; bmpBpl = (bpl + 3) / 4 * 4; // BMP pads scanlines to multiples of 4 bytes int linesPerBuf = 32678 / bmpBpl; byte[] buf = new byte[linesPerBuf * bmpBpl]; byte[] data = image.data; int imageBpl = image.bytesPerLine; int dataIndex = imageBpl * (image.height - 1); // Start at last line if (image.depth is 16) { for (int y = 0; y < image.height; y += linesPerBuf) { int count = image.height - y; if (linesPerBuf < count) count = linesPerBuf; int bufOffset = 0; for (int i = 0; i < count; i++) { for (int wIndex = 0; wIndex < bpl; wIndex += 2) { buf[bufOffset + wIndex + 1] = data[dataIndex + wIndex + 1]; buf[bufOffset + wIndex] = data[dataIndex + wIndex]; } bufOffset += bmpBpl; dataIndex -= imageBpl; } ostr.write(buf, 0, bufOffset); } } else { for (int y = 0; y < image.height; y += linesPerBuf) { int tmp = image.height - y; int count = tmp < linesPerBuf ? tmp : linesPerBuf; int bufOffset = 0; for (int i = 0; i < count; i++) { System.arraycopy(data, dataIndex, buf, bufOffset, bpl); bufOffset += bmpBpl; dataIndex -= imageBpl; } ostr.write(buf, 0, bufOffset); } } } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } return bmpBpl * image.height; } /** * Unload a DeviceIndependentImage using Windows .BMP format into the given * byte stream. */ override void unloadIntoByteStream(ImageLoader loader) { ImageData image = loader.data[0]; byte[] rgbs; int numCols; if (!((image.depth is 1) || (image.depth is 4) || (image.depth is 8) || (image.depth is 16) || (image.depth is 24) || (image.depth is 32))) DWT.error(DWT.ERROR_UNSUPPORTED_DEPTH); PaletteData pal = image.palette; if ((image.depth is 16) || (image.depth is 24) || (image.depth is 32)) { if (!pal.isDirect) DWT.error(DWT.ERROR_INVALID_IMAGE); numCols = 0; rgbs = null; } else { if (pal.isDirect) DWT.error(DWT.ERROR_INVALID_IMAGE); numCols = pal.colors.length; rgbs = paletteToBytes(pal); } // Fill in file header, except for bfsize, which is done later. int headersSize = BMPFileHeaderSize + BMPHeaderFixedSize; int[] fileHeader = new int[5]; fileHeader[0] = 0x4D42; // Signature fileHeader[1] = 0; // File size - filled in later fileHeader[2] = 0; // Reserved 1 fileHeader[3] = 0; // Reserved 2 fileHeader[4] = headersSize; // Offset to data if (rgbs !is null) { fileHeader[4] += rgbs.length; } // Prepare data. This is done first so we don't have to try to rewind // the stream and fill in the details later. ByteArrayOutputStream ostr = new ByteArrayOutputStream(); unloadData(image, ostr); byte[] data = ostr.toByteArray(); // Calculate file size fileHeader[1] = fileHeader[4] + data.length; // Write the headers try { outputStream.writeShort(fileHeader[0]); outputStream.writeInt(fileHeader[1]); outputStream.writeShort(fileHeader[2]); outputStream.writeShort(fileHeader[3]); outputStream.writeInt(fileHeader[4]); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } try { outputStream.writeInt(BMPHeaderFixedSize); outputStream.writeShort(image.width); outputStream.writeShort(image.height); outputStream.writeShort(1); outputStream.writeShort(cast(short)image.depth); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } // Unload palette if (numCols > 0) { try { outputStream.write(rgbs); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } } // Unload the data try { outputStream.write(data); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } } void flipScanLines(byte[] data, int stride, int height) { int i1 = 0; int i2 = (height - 1) * stride; for (int i = 0; i < height / 2; i++) { for (int index = 0; index < stride; index++) { byte b = data[index + i1]; data[index + i1] = data[index + i2]; data[index + i2] = b; } i1 += stride; i2 -= stride; } } }