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Added anti-aliasing when upscaling bitmaps
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4
HISTORY
4
HISTORY
@ -6557,7 +6557,7 @@ Video Disk Recorder Revision History
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- The original display size of subtitles is now used to scale them properly when
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displaying them on an HD OSD.
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2011-03-21: Version 1.7.18
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2011-03-27: Version 1.7.18
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- Changed -O2 to -O3 in Make.config.template (reported by Matti Lehtimäki).
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- Added a missing 'default' case in cPixmapMemory::DrawEllipse().
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@ -6573,3 +6573,5 @@ Video Disk Recorder Revision History
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- Fixed cUnbufferedFile::Seek() in case it is compiled without USE_FADVISE (thanks
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to Juergen Lock).
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- Fixed the Language header of the Serbian translation file (thanks to Ville Skyttä).
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- Added anti-aliasing when upscaling bitmaps (improves the display of SD subtitles
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when replayed on an HD OSD).
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54
osd.c
54
osd.c
@ -4,7 +4,7 @@
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* See the main source file 'vdr.c' for copyright information and
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* how to reach the author.
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*
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* $Id: osd.c 2.18 2011/03/13 13:52:01 kls Exp $
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* $Id: osd.c 2.19 2011/03/27 11:48:39 kls Exp $
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*/
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#include "osd.h"
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@ -503,8 +503,7 @@ void cBitmap::DrawPixel(int x, int y, tColor Color)
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{
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x -= x0;
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y -= y0;
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if (0 <= x && x < width && 0 <= y && y < height)
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SetIndex(x, y, Index(Color));
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SetIndex(x, y, Index(Color));
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}
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void cBitmap::DrawBitmap(int x, int y, const cBitmap &Bitmap, tColor ColorFg, tColor ColorBg, bool ReplacePalette, bool Overlay)
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@ -815,19 +814,42 @@ cBitmap *cBitmap::Scale(double FactorX, double FactorY)
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b->Replace(*this); // copy palette
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int RatioX = (Width() << 16) / b->Width();
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int RatioY = (Height() << 16) / b->Height();
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tIndex *DestRow = b->bitmap;
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int SourceY = 0;
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for (int y = 0; y < b->Height(); y++) {
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int SourceX = 0;
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tIndex *SourceRow = bitmap + (SourceY >> 16) * Width();
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tIndex *Dest = DestRow;
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for (int x = 0; x < b->Width(); x++) {
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*Dest++ = SourceRow[SourceX >> 16];
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SourceX += RatioX;
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}
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SourceY += RatioY;
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DestRow += b->Width();
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}
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if (FactorX <= 1.0 && FactorY <= 1.0) {
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// Downscaling - no anti-aliasing:
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tIndex *DestRow = b->bitmap;
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int SourceY = 0;
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for (int y = 0; y < b->Height(); y++) {
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int SourceX = 0;
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tIndex *SourceRow = bitmap + (SourceY >> 16) * Width();
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tIndex *Dest = DestRow;
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for (int x = 0; x < b->Width(); x++) {
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*Dest++ = SourceRow[SourceX >> 16];
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SourceX += RatioX;
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}
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SourceY += RatioY;
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DestRow += b->Width();
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}
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}
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else {
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// Upscaling - anti-aliasing:
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b->SetBpp(8);
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int SourceY = 0;
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for (int y = 0; y < b->Height() - 1; y++) {
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int SourceX = 0;
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int sy = SourceY >> 16;
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uint8_t BlendY = 0xFF - ((SourceY >> 8) & 0xFF);
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for (int x = 0; x < b->Width() - 1; x++) {
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int sx = SourceX >> 16;
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uint8_t BlendX = 0xFF - ((SourceX >> 8) & 0xFF);
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tColor c1 = b->Blend(GetColor(sx, sy), GetColor(sx + 1, sy), BlendX);
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tColor c2 = b->Blend(GetColor(sx, sy + 1), GetColor(sx + 1, sy + 1), BlendX);
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tColor c3 = b->Blend(c1, c2, BlendY);
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b->DrawPixel(x + X0(), y + Y0(), c3);
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SourceX += RatioX;
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}
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SourceY += RatioY;
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}
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}
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return b;
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}
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