protected void Page_Load(object sender, EventArgs e)
{
try
{
double proporcao;
int w, h, xCrop, yCrop;
string imgName = Request.QueryString["img"];
byte crop = Convert.ToByte(Request.QueryString["c"]);
string colorName = Request.QueryString["b"];
int interpolationMode = Convert.ToInt16(Request.QueryString["i"]);
//Precisão do redimensionamento
int p = Convert.ToInt32(Request.QueryString["p"]);
int widthT = Convert.ToInt32(Request.QueryString["w"]);
int heightT = Convert.ToInt32(Request.QueryString["h"]);
//Nome da imagem a ser cacheada ou comparada
string strImg = imgName.Substring(0, imgName.LastIndexOf('.')) + "_" + widthT + "x" + heightT + "_" + crop.ToString() + (string.IsNullOrEmpty(colorName) ? "" : "_" + colorName) + "_" + interpolationMode + "_" + p + imgName.Substring(imgName.LastIndexOf('.'));
//Path com as imagens "cacheadas"
string cachePath = Path.Combine(Server.MapPath("~/Arquivos/ThumbCache/"), strImg);
//Dados da última
DateTime dataModCache = File.GetLastWriteTime(Server.MapPath(imgName));
DateTime dataModImg = File.GetLastWriteTime(cachePath);
int comparacao = DateTime.Compare(dataModCache, dataModImg);
//Se o arquivo já existe no cache
if (File.Exists(cachePath) && comparacao <= 0)
{
OutputCacheResponse(HttpContext.Current, File.GetLastWriteTime(cachePath));
HttpContext.Current.Response.WriteFile(cachePath);
return;
}
else
{
//Cria diretório com as imagens (parâmetro)
Directory.CreateDirectory(Path.GetDirectoryName(cachePath));
//Deleta se já existe imagem cacheada
if (File.Exists(cachePath))
{
File.Delete(cachePath);
}
//Cria o "bitmap" com imagem original
string imgPath = HttpContext.Current.Request.MapPath("~/" + imgName);
Bitmap bmp = new Bitmap(imgPath);
ImageFormat formato = bmp.RawFormat;
double widthO = bmp.Size.Width;
double heightO = bmp.Size.Height;
//Caso só largura ou altura sejam transmitidas
if (widthT == 0 || heightT == 0)
{
//Cálculo com base na largura (widthT)
if (widthT > 0)
{
heightO = widthT / (widthO / heightO);
widthO = widthT;
heightT = Convert.ToInt32(heightO);
//Cálculo com base na altura (heightT)
}
else
{
widthO = heightT / (heightO / widthO);
heightO = heightT;
widthT = Convert.ToInt32(widthO);
}
}
else
{
//Caso opção seja "CROPAR"
if (crop == 1)
{
//Se uma das medidas originais forem MAIORES que o "Target"
if (widthO > widthT || heightO > heightT)
{
proporcao = widthO / heightO;
while (widthO > widthT || heightO > heightT)
{
widthO--;
heightO = widthO / proporcao;
if (widthO <= widthT && heightO <= heightT)
{
break;
}
}
}
//Se uma das medidas originais forem MENORES que o "Target"
if (widthO < widthT || heightO < heightT)
{
proporcao = widthO / heightO;
while (widthO < widthT || heightO < heightT)
{
widthO++;
heightO = widthO / proporcao;
if (widthO >= widthT && heightO >= heightT)
{
break;
}
}
}
}
else
{
//Se uma das medidas originais forem MAIORES que o "Target"
if (widthO > widthT || heightO > heightT)
{
proporcao = widthO / heightO;
while (widthO > widthT || heightO > heightT)
{
widthO--;
heightO = widthO / proporcao;
if (widthO <= widthT && heightO <= heightT)
{
break;
}
}
}
else
{
//Se uma das medidas originais forem MENORES que o "Target"
if (widthO < widthT || heightO < heightT)
{
proporcao = widthO / heightO;
while (widthO < widthT && heightO < heightT)
{
widthO++;
heightO = widthO / proporcao;
if (widthO >= widthT && heightO >= heightT)
{
break;
}
}
}
}
}
}
//Medidas finais (incluindo valor de precisão)
w = Convert.ToInt32(widthO) + p;
h = Convert.ToInt32(heightO) + p;
//Calcula as coordenadas para corte
xCrop = Convert.ToInt32((w - widthT) / 2);
yCrop = Convert.ToInt32((h - heightT) / 2);
Bitmap bmpT = new Bitmap(widthT, heightT);
EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, 95L);
//Image codec
ImageCodecInfo imgCodec = ImageCodecInfo.GetImageEncoders().FirstOrDefault(a => a.FormatID == formato.Guid);
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = qualityParam;
//Cor de fundo
Color bg = Color.White;
//Caso a cor não seja transmitida
if (string.IsNullOrEmpty(colorName))
{
//se PNG "transparent"
if (formato.Equals(ImageFormat.Png) || formato.Equals(ImageFormat.Gif))
bg = Color.Transparent;
}
else
{
try
{
//Html color (hex)
bg = ColorTranslator.FromHtml("#" + colorName);
}
catch (Exception)
{
//Html color
bg = ColorTranslator.FromHtml(colorName);
}
}
//Manipula e salva em cache
using (Graphics g = Graphics.FromImage(bmpT))
{
g.CompositingQuality = CompositingQuality.HighSpeed;
g.InterpolationMode = interpolationMode == 0 ? InterpolationMode.HighQualityBicubic : InterpolationMode.HighQualityBilinear;
g.CompositingMode = CompositingMode.SourceCopy;
g.Clear(bg);
g.DrawImage(bmp, -xCrop, -yCrop, w, h);
using (MemoryStream memoryStream = new MemoryStream())
{
bmpT.Save(memoryStream, imgCodec, encoderParams);
OutputCacheResponse(HttpContext.Current, File.GetLastWriteTime(imgPath));
using (FileStream diskCacheStream = new FileStream(cachePath, FileMode.CreateNew))
{
memoryStream.WriteTo(diskCacheStream);
}
memoryStream.WriteTo(HttpContext.Current.Response.OutputStream);
}
}
bmp.Dispose();
bmpT.Dispose();
}
}
catch (Exception ex)
{
Font font = new Font("verdana", 12);
Bitmap bmp = new Bitmap(ex.Message.Length * 10, 50);
Graphics g = Graphics.FromImage(bmp);
g.DrawString(ex.Message.Replace("'", ""), font, new SolidBrush(Color.White), new PointF(5.0F, 5.0F));
bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
g.Dispose();
bmp.Dispose();
}
}
