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More fixes for the resize code.

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git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@1763 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4
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RKrom 2012-04-08 19:11:55 +00:00
commit afc9c37ce5
2 changed files with 50 additions and 12 deletions
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42
GreenshotPlugin/Core/ImageHelper.cs
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@ -1070,36 +1070,54 @@ namespace GreenshotPlugin.Core {
/// Scale the bitmap, keeping aspect ratio, but the canvas will always have the specified size.
/// </summary>
/// <param name="sourceBitmap">Bitmap to scale</param>
/// <param name="lockAspectRatio">true to lock aspect ratio</param>
/// <param name="backgroundColor">The color to fill with, or Color.Empty to take the default depending on the pixel format</param>
/// <param name="newWidth">new width</param>
/// <param name="newHeight">new height</param>
/// <returns>a new bitmap with the specified size, the source-bitmap scaled to fit with aspect ratio locked</returns>
public static Bitmap AspectratioLockedBitmapResize(Bitmap sourceBitmap, Color backgroundColor, int newWidth, int newHeight) {
public static Bitmap ResizeBitmap(Bitmap sourceBitmap, bool lockAspectRatio, bool canvasUseNewSize, Color backgroundColor, int newWidth, int newHeight, out Point offset) {
int destX = 0;
int destY = 0;
float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;
nPercentW = ((float)newWidth / (float)sourceBitmap.Width);
nPercentH = ((float)newHeight / (float)sourceBitmap.Height);
if (nPercentH < nPercentW) {
nPercent = nPercentH;
destX = System.Convert.ToInt16((newWidth - (sourceBitmap.Width * nPercent)) / 2);
} else {
nPercent = nPercentW;
destY = System.Convert.ToInt16((newHeight - (sourceBitmap.Height * nPercent)) / 2);
if (lockAspectRatio) {
if (nPercentH != 0 && nPercentH < nPercentW) {
nPercentW = nPercentH;
if (canvasUseNewSize) {
destX = Math.Max(0, System.Convert.ToInt32((newWidth - (sourceBitmap.Width * nPercentW)) / 2));
}
} else {
nPercentH = nPercentW;
if (canvasUseNewSize) {
destY = Math.Max(0, System.Convert.ToInt32((newHeight - (sourceBitmap.Height * nPercentH)) / 2));
}
}
}
int destWidth = (int)(sourceBitmap.Width * nPercent);
int destHeight = (int)(sourceBitmap.Height * nPercent);
offset = new Point(destX, destY);
int destWidth = (int)(sourceBitmap.Width * nPercentW);
int destHeight = (int)(sourceBitmap.Height * nPercentH);
if (newWidth == 0) {
newWidth = destWidth;
}
if (newHeight == 0) {
newHeight = destHeight;
}
Bitmap newBitmap = null;
if (lockAspectRatio && canvasUseNewSize) {
newBitmap = CreateEmpty(newWidth, newHeight, sourceBitmap.PixelFormat, backgroundColor, sourceBitmap.HorizontalResolution, sourceBitmap.VerticalResolution);
} else {
newBitmap = CreateEmpty(destWidth, destHeight, sourceBitmap.PixelFormat, backgroundColor, sourceBitmap.HorizontalResolution, sourceBitmap.VerticalResolution);
}
Bitmap newBitmap = CreateEmpty(newWidth, newHeight, sourceBitmap.PixelFormat, backgroundColor, sourceBitmap.HorizontalResolution, sourceBitmap.VerticalResolution);
using (Graphics graphics = Graphics.FromImage(newBitmap)) {
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.DrawImage(sourceBitmap, new Rectangle(destX, destY, destWidth, destHeight), new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), GraphicsUnit.Pixel);
}
return newBitmap;
}