SptClipWriteTft() | TFT & EPD Graphic Library 2

Syntax

SptClipWriteTft(wPrintOrgX As wTftLibParameter1, wPrintOrgY As wTftLibParameter2, wSourceOrgX As wTftLibParameter3, wSourceOrgY As wTftLibParameter4, wSourceWidth As wTftLibParameter5, wSourceHeight As wTftLibParameter6, bBuffer As bTftLibParameter1, bTransparent As bTftLibParameter2, wAlphaColor As wTftLibParameter7, bOverlay As bTftLibParameter3)

Overview

Transfers a rectangular portion (window) of a sprite buffer to the TFT screen. The transfer uses an explicitly defined source region width and height.

Parameters

Parameter	Description
wPrintOrgX	X-coordinate of the bottom-left corner on the TFT destination
wPrintOrgY	Y-coordinate of the bottom-left corner on the TFT destination
wSourceOrgX	X-coordinate of the bottom-left corner of the source region in the sprite buffer
wSourceOrgY	Y-coordinate of the bottom-left corner of the source region in the sprite buffer
wSourceWidth	Width of the source region to transfer, in pixels
wSourceHeight	Height of the source region to transfer, in pixels
bBuffer	Sprite buffer to read from
bTransparent	Transparency mode: 0 = Normal rendering (no transparency) 1 = Transparent rendering (skip pixels matching wAlphaColor)
wAlphaColor	Alpha color value used when transparency is enabled
bOverlay	Pixel overlay / blending mode: 0 = NONE - No overlay; direct pixel replacement 1 = OR - Bitwise OR; lightens overlapping areas 2 = AND - Bitwise AND; intersection-style effect 3 = XOR - Bitwise XOR; highlights differences 4 = NAND - Inverted AND; brightens overlap zones 5 = NOR - Inverted OR; creates darker overlays 6 = XNOR - Inverted XOR; strong masking effect 7 = ADD - Color addition; brightens overlapping regions 8 = SUB - Color subtraction; darkens overlapping regions 9 = AVG - Color averaging; soft blending effect 10 = SCR - Screen blend; brightens highlights 11 = MUL - Multiply blend; darkens overlapping areas 12 = CON - Contrast blend; non-linear midtone enhancement

Notes

Effect order: transparency check → overlay → pixel write
Transparent rendering is slower, as pixels are processed individually rather than in block mode
Overlay modes are slower, since each destination pixel must be read and written
If the global "TftPixelCheck" flag is enabled:

Sprites completely outside the visible area are not drawn
Sprites partially outside the visible area are clipped to the screen boundaries

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