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Speeded up anti-aliased font rendering by caching the blend indexes

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This commit is contained in:
Klaus Schmidinger
2008-02-09 11:52:25 +01:00
parent dc23636d62
commit 197d6a9c85
3 changed files with 20 additions and 7 deletions
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22
font.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: font.c 1.22 2007/11/04 11:08:12 kls Exp $
* $Id: font.c 1.23 2008/02/09 11:52:25 kls Exp $
*/
#include "font.h"
@@ -241,10 +241,16 @@ int cFreetypeFont::Width(const char *s) const
return w;
}
#define MAX_BLEND_LEVELS 256
void cFreetypeFont::DrawText(cBitmap *Bitmap, int x, int y, const char *s, tColor ColorFg, tColor ColorBg, int Width) const
{
if (s && height) { // checking height to make sure we actually have a valid font
bool AntiAliased = Setup.AntiAlias && Bitmap->Bpp() >= 8;
bool TransparentBackground = ColorBg == clrTransparent;
int16_t BlendLevelIndex[MAX_BLEND_LEVELS]; // tIndex is 8 bit unsigned, so a negative value can be used to mark unused entries
if (AntiAliased && !TransparentBackground)
memset(BlendLevelIndex, 0xFF, sizeof(BlendLevelIndex)); // initializes the array with negative values
tIndex fg = Bitmap->Index(ColorFg);
uint prevSym = 0;
while (*s) {
@@ -266,12 +272,16 @@ void cFreetypeFont::DrawText(cBitmap *Bitmap, int x, int y, const char *s, tColo
if (bt > 0x00) {
int px = x + pitch + g->Left() + kerning;
int py = y + row + (height - Bottom() - g->Top());
tColor bg;
if (bt == 0xFF)
Bitmap->SetIndex(px, py, fg);
else {
tColor bg = (ColorBg != clrTransparent) ? ColorBg : Bitmap->GetColor(px, py);
Bitmap->SetIndex(px, py, Bitmap->Index(Bitmap->Blend(ColorFg, bg, bt)));
}
bg = fg;
else if (TransparentBackground)
bg = Bitmap->Index(Bitmap->Blend(ColorFg, Bitmap->GetColor(px, py), bt));
else if (BlendLevelIndex[bt] >= 0)
bg = BlendLevelIndex[bt];
else
bg = BlendLevelIndex[bt] = Bitmap->Index(Bitmap->Blend(ColorFg, ColorBg, bt));
Bitmap->SetIndex(px, py, bg);
}
}
else { //monochrome rendering