GDIBitmap.java

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package com.adobe.dp.office.metafile;

import com.adobe.dp.office.conv.PNGWriter;

public class GDIBitmap {

	int biWidth;

	int biHeight;

	int biBitsPixel;

	int biCompression;

	byte[] bits;

	int[] colors;

	public GDIBitmap(int biWidth, int biHeight, int biBitsPixel, int biCompression, byte[] bits, int[] colors) {
		this.biWidth = biWidth;
		this.biHeight = biHeight;
		this.biBitsPixel = biBitsPixel;
		this.biCompression = biCompression;
		this.bits = bits;
		this.colors = colors;
	}

	public int getWidth() {
		return biWidth;
	}

	public int getHeight() {
		return biHeight;
	}

	public int getBitsPerPixel() {
		return biBitsPixel;
	}

	public String toString() {
		return "[GDIBitmap " + biWidth + " " + biHeight + " " + biBitsPixel + "]";
	}

	public void saveAsPNG(PNGWriter writer) {
		if (biCompression != 0)
			throw new RuntimeException("not supported yet: comp=" + biCompression);
		if (biBitsPixel == 24 || biBitsPixel == 8) {
			int byteWidth = biWidth * 3;
			int stride = 4 * ((biWidth * biBitsPixel + 31) / 32);
			byte[] scanline = new byte[byteWidth];
			int height;
			int offset;
			int increment;
			if (biHeight > 0) {
				offset = stride * (biHeight - 1);
				increment = -stride;
				height = biHeight;
			} else {
				offset = 0;
				increment = stride;
				height = -biHeight;
			}
			for (int j = 0; j < height; j++) {
				if (biBitsPixel == 24) {
					for (int i = 0; i < byteWidth; i += 3) {
						scanline[i] = bits[offset + i + 2]; // R
						scanline[i + 1] = bits[offset + i + 1]; // G
						scanline[i + 2] = bits[offset + i]; // B
					}
				} else {
					int si = 0;
					for (int i = 0; i < biWidth; i++) {
						int color = colors[bits[offset + i] & 0xFF];
						scanline[si++] = (byte) (color >> 16); // R
						scanline[si++] = (byte) (color >> 8); // G
						scanline[si++] = (byte) color; // B
					}
				}
				writer.writeScanline(scanline, 0, byteWidth);
				offset += increment;
			}
			return;
		}
		if (biBitsPixel == 1) {
			int[] clrs = { 0, 0xFFFFFF };
			if (colors != null)
				clrs = colors;
			int byteWidth = biWidth * 3;
			int stride = 4 * ((biWidth + 31) / 32);
			byte[] scanline = new byte[byteWidth];
			int height;
			int offset;
			int increment;
			if (biHeight > 0) {
				offset = stride * (biHeight - 1);
				increment = -stride;
				height = biHeight;
			} else {
				offset = 0;
				increment = stride;
				height = -biHeight;
			}
			for (int j = 0; j < height; j++) {
				int si = 0;
				for (int i = 0; i < biWidth; i++) {
					int color = clrs[(bits[offset + i / 8] >> (7 - (i & 7))) & 1];
					scanline[si++] = (byte) (color >> 16); // R
					scanline[si++] = (byte) (color >> 8); // G
					scanline[si++] = (byte) color; // B
				}
				writer.writeScanline(scanline, 0, byteWidth);
				offset += increment;
			}
			return;
		}
		throw new RuntimeException("not supported yet: bpp=" + biBitsPixel);
	}
}