private static void GenerateSprite(string path, ImageSettings settings, int x, int y, int spriteNumber, List<Bitmap> images, TextWriter cssHighCompatOutput, TextWriter cssLowCompatOutput) {
// Create a drawing surface and add the images to it
using (Bitmap sprite = new Bitmap(x, y))
using (Graphics drawingSurface = Graphics.FromImage(sprite)) {
// Set the background to the specs from the settings file
drawingSurface.Clear(settings.BackgroundColor);
// Make the final sprite and save it
int xOffset = 0;
int yOffset = 0;
foreach (Bitmap image in images) {
drawingSurface.DrawImage(image, new Rectangle(xOffset, yOffset, image.Width, image.Height));
// Add the CSS data
GenerateCss(xOffset, yOffset, spriteNumber, settings.Format, settings.Base64, image, cssHighCompatOutput);
GenerateCss(xOffset, yOffset, spriteNumber, settings.Format, false, image, cssLowCompatOutput);
if (settings.TileInYAxis) {
yOffset += image.Height;
}
else {
xOffset += image.Width;
}
}
// Set the encoder parameters and make the image
try {
using (EncoderParameters spriteEncoderParameters = new EncoderParameters(1)) {
spriteEncoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, settings.Quality);
// Attempt to save the image to disk with the specified encoder
sprite.Save(Path.Combine(path, "sprite" + spriteNumber + "." + settings.Format), GetEncoderInfo(settings.Format), spriteEncoderParameters);
}
}
catch (Exception) {
// If errors occur, get the CLI to auto-choose an encoder. Unfortunately this means that the quality settings will be not used.
try {
sprite.Save(Path.Combine(path, "sprite" + spriteNumber + "." + settings.Format));
}
catch (Exception) {
// If errors occur again, try to save as a png
sprite.Save(Path.Combine(path, "sprite" + spriteNumber + ".png"));
}
}
}
return;
}
private static ImageSettings ReadSettings(string path, string spriteFolderRelativePath) {
ImageSettings settings = new ImageSettings();
XmlTextReader settingsData;
// Open the settings file. If it cannot be opened, or one cannot be found, use defaults
try {
using (settingsData = new XmlTextReader(Path.Combine(path, SettingsFileName))) {
while (settingsData.Read()) {
if (settingsData.NodeType == XmlNodeType.Element) {
string nodeName = settingsData.Name;
if (nodeName.Equals("FileFormat", StringComparison.OrdinalIgnoreCase)) {
settings.Format = settingsData.ReadElementContentAsString().Trim('.');
}
else if (nodeName.Equals("Quality", StringComparison.OrdinalIgnoreCase)) {
settings.Quality = settingsData.ReadElementContentAsInt();
}
else if (nodeName.Equals("MaxSize", StringComparison.OrdinalIgnoreCase)) {
settings.MaxSize = settingsData.ReadElementContentAsInt();
}
else if (nodeName.Equals("BackgroundColor", StringComparison.OrdinalIgnoreCase)) {
string output = settingsData.ReadElementContentAsString();
int temp = Int32.Parse(output, System.Globalization.NumberStyles.HexNumber);
settings.BackgroundColor = Color.FromArgb(temp);
}
else if (nodeName.Equals("Base64Encoding", StringComparison.OrdinalIgnoreCase)) {
settings.Base64 = settingsData.ReadElementContentAsBoolean();
}
else if (nodeName.Equals("TileInYAxis", StringComparison.OrdinalIgnoreCase)) {
settings.TileInYAxis = settingsData.ReadElementContentAsBoolean();
}
}
}
}
return settings;
}
catch (FileNotFoundException) {
// If no file is found, recursively check parent directories up until the root image folder for a settings file
if (path.Replace(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar).TrimEnd(Path.AltDirectorySeparatorChar).EndsWith(spriteFolderRelativePath.TrimStart('~').Replace(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar).Trim(Path.AltDirectorySeparatorChar), StringComparison.OrdinalIgnoreCase)) {
// If the current directory is the root image folder, use the default values
return settings;
}
try {
return ReadSettings(Directory.GetParent(path).FullName, spriteFolderRelativePath);
}
catch (Exception) {
return settings;
}
}
// If any other exceptions occur, use the default values
catch (Exception) {
return settings;
}
}
private static void PerformOptimizations(string path, string spriteFolderRelativePath, ImageSettings settings, TextWriter cssHighCompatOutput, TextWriter cssLowCompatOutput, List<string> imageLocations) {
// Create a list containing each image (in Bitmap format), and calculate the total size (in pixels) of final image
int x = 0;
int y = 0;
int imageIndex = 0;
long size = 0;
int spriteNumber = 0;
List<Bitmap> images = new List<Bitmap>();
try {
foreach (string imagePath in imageLocations) {
// If the image is growing above the specified max file size, make the sprite with the existing images
// and add the new image to the next sprite list
if ((imageIndex > 0) && IsSpriteOversized(settings.MaxSize, size, imagePath)) {
GenerateSprite(path, settings, x, y, spriteNumber, images, cssHighCompatOutput, cssLowCompatOutput);
// Clear the existing images
foreach (Bitmap image in images) {
image.Dispose();
}
// Reset variables to initial values, and increment the spriteNumber
images.Clear();
x = 0;
y = 0;
imageIndex = 0;
size = 0;
spriteNumber++;
}
// Add the current image to the list of images that are to be processed
images.Add(new Bitmap(imagePath));
// Use the image tag to store its name
images[imageIndex].Tag = MakeCssClassName(imagePath, spriteFolderRelativePath);
// Find the total pixel size of the sprite based on the tiling direction
if (settings.TileInYAxis) {
y += images[imageIndex].Height;
if (x < images[imageIndex].Width) {
x = images[imageIndex].Width;
}
}
else {
x += images[imageIndex].Width;
if (y < images[imageIndex].Height) {
y = images[imageIndex].Height;
}
}
// Update the filesize size of the bitmap list
size += (new FileInfo(imagePath)).Length;
imageIndex++;
}
// Merge the final list of bitmaps into a sprite
if (imageIndex != 0)
GenerateSprite(path, settings, x, y, spriteNumber, images, cssHighCompatOutput, cssLowCompatOutput);
}
finally
// Close the CSS file and clear the images list
{
foreach (Bitmap image in images) {
image.Dispose();
}
images.Clear();
}
}