// parses a BITMAPFILEHEADER and BITMAPINFOHEADER to get
// the offset of the image bits, the size of the image and
// if it's a transparent bitmap.
private static void GetBitmapInfo(byte[] data, out uint BitsOffset, out uint ImageSize, out bool IsTransparent)
{
BitsOffset = 0;
ImageSize = 0;
IsTransparent = false;
using (BinaryReader reader = new BinaryReader(new MemoryStream(data)))
{
BITMAPFILEHEADER fileHeader = new BITMAPFILEHEADER();
BITMAPINFOHEADER infoHeader = new BITMAPINFOHEADER();
if (!fileHeader.Read(reader))
{
return;
}
if (!infoHeader.Read(reader))
{
return;
}
BitsOffset = fileHeader.bfOffBits;
ImageSize = (uint)(System.Math.Abs(infoHeader.biWidth) * System.Math.Abs(infoHeader.biHeight));
IsTransparent = infoHeader.IsTransparent;
}
}
// Display a bitmap at a given location.
public void BitBltBmp(int x, int y, byte[] buffer)
{
BITMAPFILEHEADER bfh;
BITMAPINFOHEADER bih;
int lDelta;
int cbScanLine;
int used;
int offset = 0;
bfh = BITMAPFILEHEADER.Read(buffer, offset, out used);
bih = BITMAPINFOHEADER.Read(buffer, used, out used);
if (bih.biWidth == 0 || bih.biHeight == 0) {
return;
}
if (x < 0) {
x = SCREEN_WIDTH + x - bih.biWidth;
}
if (y < 0) {
y = SCREEN_HEIGHT + y - bih.biHeight;
}
if (x < 0 || x + bih.biWidth > SCREEN_WIDTH ||
y < 0 || y + bih.biHeight > SCREEN_HEIGHT) {
throw new OverflowException("Draw bounds invalid.");
}
offset = offset + bfh.bfOffBits;
used = offset;
//
// Make sure this is a 1bpp or 4bpp bitmap.
//
if ((bih.biBitCount * bih.biPlanes) <= 4 || bih.biCompression != 0) {
cbScanLine = (((bih.biWidth * bih.biBitCount) + 31) & ~31) / 8;
if (bih.biHeight < 0) {
// top down bitmap
lDelta = cbScanLine;
bih.biHeight = -bih.biHeight;
}
else {
// bottom up bitmap
offset += cbScanLine * (bih.biHeight - 1);
lDelta = -cbScanLine;
}
if (used + cbScanLine * bih.biHeight > buffer.Length) {
DebugStub.Print("{0} + {1} * {2} = {3} > {4}\n",
__arglist(
used,
cbScanLine,
bih.biHeight,
used + cbScanLine * bih.biHeight,
buffer.Length);
throw new OverflowException("Bitmap invalid.");
}
if (bih.biBitCount == 1) {
BitBlt1(x, y, bih.biWidth, bih.biHeight, buffer, offset, lDelta, 15);
}
else if (bih.biBitCount == 4) {
BitBlt4(x, y, bih.biWidth, bih.biHeight, buffer, offset, lDelta);
}
}
else {
//
// We don't support this type of bitmap.
//
DebugStub.Print("((bih.biBitCount * bih.biPlanes) not supported");
}
}
// parses a BITMAPFILEHEADER and BITMAPINFOHEADER to get
// the offset of the image bits, the size of the image and
// if it's a transparent bitmap.
private static void GetBitmapInfo(byte[] data, out uint BitsOffset, out uint ImageSize, out bool IsTransparent)
{
BitsOffset = 0;
ImageSize = 0;
IsTransparent = false;
using(BinaryReader reader = new BinaryReader(new MemoryStream(data)))
{
BITMAPFILEHEADER fileHeader = new BITMAPFILEHEADER();
BITMAPINFOHEADER infoHeader = new BITMAPINFOHEADER();
if(!fileHeader.Read(reader))
return;
if(!infoHeader.Read(reader))
return;
BitsOffset = fileHeader.bfOffBits;
ImageSize = (uint)(System.Math.Abs(infoHeader.biWidth) * System.Math.Abs(infoHeader.biHeight));
IsTransparent = infoHeader.IsTransparent;
}
}