public static Bitmap GetMergedBitmap(AddTexImageInfo[] images, OptimizedImgParams[] xLimits,
int mergedImgWidth, int mergedImgHeight)
{
var heightOfEachImage = images[0].ImageBitmap.Height;
if (images.Any(image => image.ImageBitmap.Height != heightOfEachImage))
{
throw new Exception("GetMergedBitmap: All images should be of the same height");
}
var mergedBitmap = new Bitmap(mergedImgWidth, mergedImgHeight);
var g = Graphics.FromImage(mergedBitmap);
g.Clear(Color.FromArgb(200, 200, 200));
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.Dispose();
var previousImgWidths = 0;
for (var index = 0; index < images.Length; index++)
{
for (var y = 0; y < heightOfEachImage; y++)
{
var image = images[index];
//in the merged image, the original bitmaps are stacked one next to the other
//the widths of the stacked images are cropped to their optimizedWidth
//move forward by the previous image width
var mergedImageXPos = previousImgWidths;
if (xLimits[index].XLimitsAtYIndices[y].Min >= xLimits[index].OptimizedImgMin)
{
//move forward by the cropped min
mergedImageXPos += xLimits[index].XLimitsAtYIndices[y].Min - xLimits[index].OptimizedImgMin;
//Copy the pixel data from the image
for (int x = xLimits[index].XLimitsAtYIndices[y].Min, noOfPixels = 1;
noOfPixels <= xLimits[index].XLimitsAtYIndices[y].Width;
noOfPixels++, x++)
{
var pixel = image.ImageBitmap.GetPixel(x, y);
mergedBitmap.SetPixel(mergedImageXPos, y, pixel);
mergedImageXPos++;
}
}
}
previousImgWidths += xLimits[index].OptimizedImgWidth;
}
//fill up blank spaces by extending edges
TexImageOptimizer.ExtendTextureToAllSidesOfImage(mergedBitmap, 0);
return(mergedBitmap);
}
public static ImgIndexRange GetNextIndexRangeFromLeft(int beyondThisIndex, Bitmap img, int y, bool validInvalidFlag)
{
var startIndex = -1;
for (var ctr = beyondThisIndex + 1; ctr >= 0 && ctr < img.Width; ctr++)
{
var valid = TexImageOptimizer.IsValidPixel(ctr, y, img);
if (valid == validInvalidFlag)
{
startIndex = ctr;
break;
}
}
if (startIndex < 0)
{
return(null);
}
var endIndex = startIndex;
for (var ctr = startIndex + 1; ctr >= 0 && ctr < img.Width; ctr++)
{
var valid = TexImageOptimizer.IsValidPixel(ctr, y, img);
if (valid == validInvalidFlag)
{
endIndex = ctr;
}
else
{
break; //looking for continuous stream of pixels of same type (valid or invalid)
}
}
return(new ImgIndexRange {
MinIndex = startIndex, MaxIndex = endIndex
});
}
internal static void ExtendRightTextureAtYValue(Bitmap img, int y, int consecutiveValidSidePixelsToOverlay)
{
var nextRange = IndexRangeProcessor.GetNextIndexRangeFromRight(img.Width, img, y, validInvalidFlag: false);
while (nextRange != null)
{
if (consecutiveValidSidePixelsToOverlay > 0)
{
var validRange = IndexRangeProcessor.GetNextIndexRangeFromRight(nextRange.MinIndex, img, y, validInvalidFlag: true);
if (validRange != null && (validRange.MaxIndex + 1 - validRange.MinIndex) > consecutiveValidSidePixelsToOverlay)
{
nextRange.MinIndex = nextRange.MinIndex - consecutiveValidSidePixelsToOverlay;
}
}
var indexOfPixelToOverlay = nextRange.MinIndex - 1;
if (0 <= indexOfPixelToOverlay && indexOfPixelToOverlay < img.Width)
{
var colorForOverlay = img.GetPixel(indexOfPixelToOverlay, y);
TexImageOptimizer.ColorPixels(nextRange.MinIndex, nextRange.MaxIndex, colorForOverlay, img, y);
}
nextRange = IndexRangeProcessor.GetNextIndexRangeFromRight(nextRange.MinIndex, img, y, validInvalidFlag: false);
}
}
