Mega Code Archive
Write Alpha Jpg
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/* Copyright (C) 2008 Robin Debreuil -- Released under the BSD License */
using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing.Text;
namespace DDW.Swf
{
public class Utils
{
public const uint TwipsPerPixel = 20;
public static void WriteAlphaJpg(byte[] alphaData, Bitmap jpg, string pngDest)
{
int w = jpg.Width;
int h = jpg.Height;
Bitmap png = new Bitmap(w, h, PixelFormat.Format32bppArgb);
BitmapData jpgData = jpg.LockBits(
new Rectangle(0, 0, w, h),
ImageLockMode.ReadOnly,
PixelFormat.Format24bppRgb);
BitmapData pngData = png.LockBits(
new Rectangle(0, 0, w, h),
ImageLockMode.WriteOnly,
PixelFormat.Format32bppArgb);
unsafe
{
byte* jpgStart = (byte*)jpgData.Scan0.ToPointer();
byte* pngStart = (byte*)pngData.Scan0.ToPointer();
int jpgStride = jpgData.Stride;
int pngStride = pngData.Stride;
for (int y = 0; y < h; y++)
{
byte* jpgRow = (byte*)(jpgStart + y * jpgStride);
byte* pngRow = (byte*)(pngStart + y * pngStride);
for (int x = 0; x < w; x++) // 3 bpp
{
int pngX = x * 4;
int jpgX = x * 3;
pngRow[pngX] = jpgRow[jpgX];
pngRow[pngX + 1] = jpgRow[jpgX + 1];
pngRow[pngX + 2] = jpgRow[jpgX + 2];
pngRow[pngX + 3] = alphaData[y*w + x];
}
}
}
jpg.UnlockBits(jpgData);
png.UnlockBits(pngData);
DDW.Vex.Utils.EnsurePath(pngDest);
png.Save(pngDest);
png.Dispose();
}
public static Vex.Size GetJpgSize(string path)
{
Bitmap bmp = new Bitmap(path, false);
Vex.Size sz = new DDW.Vex.Size(bmp.Width, bmp.Height);
bmp.Dispose();
return sz;
}
public static Matrix ScaleBitmapMatrix(Matrix m)
{
System.Drawing.Drawing2D.Matrix mx =
new System.Drawing.Drawing2D.Matrix(m.ScaleX, m.Rotate0, m.Rotate1, m.ScaleY, m.TranslateX, m.TranslateY);
mx.Scale(1 / 20F, 1 / 20F);
float[] els = mx.Elements;
return new Matrix(els[0], els[1], els[2], els[3], els[4], els[5]);
}
}
}
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