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Improve anti aliased text rendering #25

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Improve anti aliased text rendering #25

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bbf1dab
Fix trailing ghost vertical edge on right edge of character on antial…
alexfaria Feb 24, 2026
eeae309
Invert the gray colours for anti-aliased text if the background is black
alexfaria Feb 24, 2026
8663533
Clear line buffer before decoding in antialiasing
alexfaria Feb 24, 2026
2217c12
Skip background pixels when rendering AA fonts
alexfaria Feb 25, 2026
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15 changes: 12 additions & 3 deletions src/bb_ep_gfx.inl
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Original file line number Diff line number Diff line change
Expand Up @@ -1146,15 +1146,24 @@ int bbepWriteStringCustom(FASTEPDSTATE *pBBEP, const void *pFont, int x, int y,
memset(u8Cache, 0, iLineSize*2); // start with 2 lines of white (gray table is inverted)
for (ty=dy; ty<end_y+1 && ty+1 < height; ty++) {
uint8_t u8, u8Count, u8Color;
g5_decode_line(&g5dec, &u8Cache[(ty & 1) * iLineSize]);
uint8_t *lineBuf = &u8Cache[(ty & 1) * iLineSize];
memset(lineBuf, 0, iLineSize);
g5_decode_line(&g5dec, lineBuf);
if (w & 7) {
u8Cache[(ty & 1) * iLineSize + iLineSize - 1] &= u8EndMask;
}
if (ty & 1 && ty/2 >= 0) {
Scale2Gray(u8Cache, iLineSize, iLineSize); // convert a pair of lines
s = u8Cache;
u8 = *s++; // grab first byte
u8Count = 4;
for (tx=x+x_off; tx<x+x_off+tw && tx < width; tx+=2) {
u8Color = grayColors[u8>>6];
(*pBBEP->pfnSetPixelFast)(pBBEP, tx/2, ty/2, u8Color);
u8Color = grayColors[iBG == BBEP_BLACK ? 3 - (u8>>6) : u8>>6]; // invert the color if we're on a black background
if (u8Color != iBG) {
// draw the pixel if it's not transparent
// avoid overlapping the previous character's pixels if the font is Italic for example
(*pBBEP->pfnSetPixelFast)(pBBEP, tx/2, ty/2, u8Color);
}
u8 <<= 2;
u8Count--;
if (u8Count == 0) {
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