public void DrawImage(LImage img, int dstX, int dstY, int dstWidth, int dstHeight,
int srcX, int srcY, int srcWidth, int srcHeight)
{
if (isClose || img == null || img.IsClose())
{
return;
}
LGraphics pixel = img.GetLGraphics();
pixel.UpdatePixels();
dstX += translateX;
dstY += translateY;
srcX += translateX;
srcY += translateY;
if (pixel == null || dstWidth <= 0 || dstHeight <= 0 || srcWidth <= 0 || srcHeight <= 0)
{
return;
}
if (dstWidth == srcWidth && dstHeight == srcHeight)
{
DrawImage(pixel, dstX, dstY, dstWidth, dstHeight, srcX, srcY);
return;
}
Color[] currentPixels = pixel.pixels;
int spitch = pixel.width;
int dpitch = this.width;
float x_ratio = ((float)srcWidth - 1) / dstWidth;
float y_ratio = ((float)srcHeight - 1) / dstHeight;
float x_diff = 0F;
float y_diff = 0F;
int dx = dstX;
int dy = dstY;
int sx = srcX;
int sy = srcY;
int i = 0;
int j = 0;
for (; i < dstHeight; i++)
{
sy = (int)(i * y_ratio) + srcY;
dy = i + dstY;
y_diff = (y_ratio * i + srcY) - sy;
if (sy < 0 || dy < 0)
{
continue;
}
if (sy >= pixel.height || dy >= this.height)
{
break;
}
for (j = 0; j < dstWidth; j++)
{
sx = (int)(j * x_ratio) + srcX;
dx = j + dstX;
x_diff = (x_ratio * j + srcX) - sx;
if (sx < 0 || dx < 0)
{
continue;
}
if (sx >= pixel.width || dx >= this.width)
{
break;
}
int src_ptr = sx + sy * spitch;
int dst_ptr = dx + dy * dpitch;
Color src_color = currentPixels[src_ptr];
uint src_pixel = src_color.PackedValue;
if (src_pixel != LSystem.TRANSPARENT)
{
float ta = (1 - x_diff) * (1 - y_diff);
float tb = (x_diff) * (1 - y_diff);
float tc = (1 - x_diff) * (y_diff);
float td = (x_diff) * (y_diff);
uint a = (uint)(((src_pixel & 0xff000000) >> 24) * ta +
((src_pixel & 0xff000000) >> 24) * tb +
((src_pixel & 0xff000000) >> 24) * tc +
((src_pixel & 0xff000000) >> 24) * td) & 0xff;
uint b = (uint)(((src_pixel & 0xff0000) >> 16) * ta +
((src_pixel & 0xff0000) >> 16) * tb +
((src_pixel & 0xff0000) >> 16) * tc +
((src_pixel & 0xff0000) >> 16) * td) & 0xff;
uint g = (uint)(((src_pixel & 0xff00) >> 8) * ta +
((src_pixel & 0xff00) >> 8) * tb +
((src_pixel & 0xff00) >> 8) * tc +
((src_pixel & 0xff00) >> 8) * td) & 0xff;
uint r = (uint)((src_pixel & 0xff) * ta +
(src_pixel & 0xff) * tb +
(src_pixel & 0xff) * tc +
(src_pixel & 0xff) * td) & 0xff;
Color dst_color = pixels[dst_ptr];
DrawPoint(pixels, dst_ptr, Blend(r, g, b, a, dst_color));
}
else
{
DrawPoint(pixels, dst_ptr, LSystem.TRANSPARENT);
}
}
}
}
