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The original display size of subtitles is now used to scale them properly when displaying them on an HD OSD

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This commit is contained in:
Klaus Schmidinger
2011-03-12 16:08:08 +01:00
parent 11cca8015c
commit 2bd17596a0
5 changed files with 81 additions and 17 deletions
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26
osd.c
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@@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: osd.c 2.16 2011/02/27 11:57:37 kls Exp $
* $Id: osd.c 2.17 2011/03/12 15:32:33 kls Exp $
*/
#include "osd.h"
@@ -807,6 +807,30 @@ void cBitmap::ShrinkBpp(int NewBpp)
}
}
cBitmap *cBitmap::Scale(double FactorX, double FactorY)
{
// Fixed point scaling code based on www.inversereality.org/files/bitmapscaling.pdf
// by deltener@mindtremors.com
cBitmap *b = new cBitmap(int(round(Width() * FactorX)), int(round(Height() * FactorY)), Bpp(), X0(), Y0());
b->Replace(*this); // copy palette
int RatioX = (Width() << 16) / b->Width();
int RatioY = (Height() << 16) / b->Height();
tIndex *DestRow = b->bitmap;
int SourceY = 0;
for (int y = 0; y < b->Height(); y++) {
int SourceX = 0;
tIndex *SourceRow = bitmap + (SourceY >> 16) * Width();
tIndex *Dest = DestRow;
for (int x = 0; x < b->Width(); x++) {
*Dest++ = SourceRow[SourceX >> 16];
SourceX += RatioX;
}
SourceY += RatioY;
DestRow += b->Width();
}
return b;
}
// --- cRect -----------------------------------------------------------------
const cRect cRect::Null;