本文整理汇总了C#中Gdk.Pixbuf.Scale方法的典型用法代码示例。如果您正苦于以下问题：C# Pixbuf.Scale方法的具体用法？C# Pixbuf.Scale怎么用？C# Pixbuf.Scale使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Gdk.Pixbuf的用法示例。
在下文中一共展示了Pixbuf.Scale方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: LoadAndScaleImage
//
// Loads the image from disk and scales it to certain size
// It is used to generate the final images and thumbnails
//
void LoadAndScaleImage(int width, int height)
{
if (image == null)
throw new InvalidOperationException ("SlideImage.LoadAndScaleImage: no filename defined for image");
if (width <= 0 || height <= 0)
throw new InvalidOperationException ("SlideImage.LoadAndScaleImage: width and height should be > 0");
Logger.Debug ("SlideImage.LoadAndScaleImage. {0} {1} {2}", image, width, height);
int max_w = width; // max target width
int max_h = height; // max target height
double target_ratio = (double) max_w / (double) max_h; // aspect ratio target
double scale, original_ratio, corrected_ratio;
Gdk.Pixbuf raw_image, processed_image;
raw_image = new Gdk.Pixbuf (image);
Logger.Debug ("SlideImage.LoadAndScaleImage. Load image w:{0} h:{1} channels:{2}", raw_image.Width, raw_image.Height, raw_image.NChannels);
if (raw_image.NChannels != 3 && raw_image.NChannels != 4) {
Logger.Error ("SlideImage.LoadAndScaleImage. Image {0} with unsupported number of channels ({1})", image, raw_image.NChannels);
return;
}
processed_image = new Gdk.Pixbuf (Colorspace.Rgb, raw_image.NChannels == 3 ? false : true, 8, max_w, max_h);
processed_image.Fill (0x00000000);
original_ratio = (double) raw_image.Width / (double) raw_image.Height;
// Image is larger that target resolution, we need to rescale
if (raw_image.Width > max_w || raw_image.Height > max_h) {
if (original_ratio < 1) { // If X is properly scaled (the smaller), Y will be too
if (original_ratio > target_ratio)
corrected_ratio = target_ratio / original_ratio;
else
corrected_ratio = original_ratio / target_ratio;
scale = (double) max_w / (double) raw_image.Width;
h = (int) ((double) raw_image.Width * scale / original_ratio * corrected_ratio);
w = (int) ((double) raw_image.Width * scale * corrected_ratio);
} else { // If Y is properly scaled (the smaller), X will be too (used path for NTSC and PAL resolutions)
if (original_ratio > target_ratio)
corrected_ratio = target_ratio / original_ratio;
else
corrected_ratio = original_ratio / target_ratio;
scale = (double) max_h / (double) raw_image.Height;
h = (int) ((double) raw_image.Width * scale / original_ratio * corrected_ratio);
w = (int) ((double) raw_image.Width * scale * corrected_ratio);
}
} else { // No need to scale
w = raw_image.Width;
h = raw_image.Height;
}
if (w < max_w)
offset_x = (max_w -w) / 2;
else
offset_x = 0;
if (h < max_h)
offset_y = (max_h - h) / 2;
else
offset_y = 0;
raw_image.Scale (processed_image, offset_x, offset_y, w, h, offset_x, offset_y,
(double) w / (double) raw_image.Width, (double)h /(double) raw_image.Height, InterpType.Hyper);
LoadFromPixelData (processed_image.Pixels,
processed_image.NChannels == 3 ? PixelFormat.PIXBUF_RGB : PixelFormat.PIXBUF_ARGB,
processed_image.Width, processed_image.Height,
processed_image.Rowstride, processed_image.NChannels);
raw_image.Dispose ();
processed_image.Dispose ();
}