public static Bitmap LoadCustomImageFromCache(string sFile, ProjectLayoutElement zElement, Color colorOverride, int nTargetWidth = -1, int nTargetHeight = -1)
{
var sKey = sFile.ToLower() + ":" + zElement.opacity + ":" + nTargetWidth + ":" + nTargetHeight + ProjectLayoutElement.GetElementColorString(colorOverride);
if (s_dictionaryCustomImages.TryGetValue(sKey, out var zDestinationBitmap))
{
return(zDestinationBitmap);
}
var zElementType = EnumUtil.GetElementType(zElement.type);
var zSourceBitmap = LoadImageFromCache(sFile);
if (null == zSourceBitmap)
{
return(null);
}
// if the desired width/height/opacity match the 'plain' cached copy just return it (or special color handling for certain element types)
// TODO: make a method for this just to shrink all this logic down
if (
(
(-1 == nTargetWidth || zSourceBitmap.Width == nTargetWidth) &&
(-1 == nTargetHeight || zSourceBitmap.Height == nTargetHeight) &&
255 == zElement.opacity
)
)
{
switch (zElementType)
{
case ElementType.FormattedText:
case ElementType.Graphic:
if (colorOverride == Color.Black)
{
return(zSourceBitmap);
}
break;
default:
return(zSourceBitmap);
}
}
// TODO: should this be handled in a shared way?
// TODO: this is a terrible eviction strategy
if (s_dictionaryCustomImages.Count > IMAGE_CACHE_MAX)
{
DumpImagesFromDictionary(s_dictionaryCustomImages);
}
var zImageAttributes = new ImageAttributes();
var zColor = new ColorMatrix();
if (255 != zElement.opacity)
{
zColor.Matrix33 = (float)zElement.opacity / 255.0f;
}
// special color handling for certain element types
if (colorOverride != Color.Black)
{
switch (zElementType)
{
case ElementType.FormattedText:
case ElementType.Graphic:
zColor.Matrix40 = (float)colorOverride.R / 255.0f;
zColor.Matrix41 = (float)colorOverride.G / 255.0f;
zColor.Matrix42 = (float)colorOverride.B / 255.0f;
break;
}
}
zImageAttributes.SetColorMatrix(zColor);
nTargetWidth = nTargetWidth == -1 ? zSourceBitmap.Width : nTargetWidth;
nTargetHeight = nTargetHeight == -1 ? zSourceBitmap.Height : nTargetHeight;
zDestinationBitmap = new Bitmap(nTargetWidth, nTargetHeight); // target image
var zGraphics = Graphics.FromImage(zDestinationBitmap);
// draw the source image into the destination with the desired opacity
zGraphics.DrawImage(zSourceBitmap, new Rectangle(0, 0, nTargetWidth, nTargetHeight), 0, 0, zSourceBitmap.Width, zSourceBitmap.Height, GraphicsUnit.Pixel,
zImageAttributes);
CacheImage(s_dictionaryCustomImages, sKey, zDestinationBitmap);
return(zDestinationBitmap);
}