TftOverTransAreaRect()

TftInvOverTransAreaRect(wOriginX As wTftLibParameter1, wOriginY As wTftLibParameter2, wAWidth As wTftLibParameter3, wAHeight As wTftLibParameter4, wAColor As wTftLibParameter5, bOverlay As bTftLibParameter1, wOColor As wTftLibParameter6)

Apply bitwise pixel processing with an overlay color to a defined rectangular area on the TFT screen, while also supporting a transparent layer.

Parameters:

wOriginX - X coordinate of the bottom-left corner of the area to be processed.

wOriginY - Y coordinate of the bottom-left corner of the area to be processed.

wAreaWidth - Width of the rectangular region to apply the overlay effect to.

wAreaHeight - Height of the rectangular region to apply the overlay effect to.

wAlpColor - Alpha color value used when transparent processing is enabled. Pixels matching this color are skipped.

bOverlay — Pixel overlay effect mode:

0 = NONE – No overlay; direct pixel replacement.

1 = OR – Lightens overlapping areas (adds bits); merges bright regions.

2 = AND – Keeps only common bits; intersection-style effect.

3 = XOR – Highlights differences; toggles pixels where colors differ.

4 = NAND – Inverts the intersection; brightens overlap zones.

5 = NOR – Inverts the union; creates darker overlays.

6 = XNOR – Keeps pixels unchanged where both match; strong masking effect.

7 = ADD – Adds color values; brightens overlapping regions (light addition).

8 = SUB – Subtracts color values; darkens overlaps (shadow-like effect).

9 = AVG – Averages colors; produces a soft blending effect.

10 = SCR – Screen blend (inverse multiply); brightens highlights.

11 = MUL – Multiply blend; darkens overlapping areas (similar to Photoshop “Multiply”).

12 = CON – Contrast blend; enhances midtones using a non-linear mix.

wOverColor - Overlay color value used for bitwise pixel processing.

Notes:

The overlay operation is relatively slow, as it requires reading, modifying, and rewriting each pixel within the target area.

When the global TftPixelCheck flag is enabled, boundary checks are performed:

If the defined area lies completely outside the visible screen, no operation is performed.

If the area is partially outside the visible screen, it is clipped to the valid screen boundaries before processing.

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