TftBmpMemIndRotate()

TftBmpMemIndRotate(wFileIndex As wTftLibParameter1, wX_Pos As wTftLibParameter2, wY_Pos As wTftLibParameter3, wAngleDeg As wTftLibParameter4, wBackground As wTftLibParameter5, bTransparent As bTftLibParameter1, wAlphaColor As wTftLibParameter6, bInvert As bTftLibParameter2, bOverlay As bTftLibParameter3), Byte

Renders a BMP by index stored in FLASH memory, rotates it counter-clockwise by a specified angle, and applies optional transparency, inversion, and pixel-overlay effects.

wFileIndex – Zero-based BMP file index in FLASH memory.

wX_Pos – X-coordinate of the rotated image’s lower-left corner.

wY_Pos – Y-coordinate of the rotated image’s lower-left corner.

wAngleDeg – Rotation angle in degrees (CCW).

wBackground – Fill color for exposed areas created by rotation.

bTransparent – Transparency mode:

0 – Normal rendering (no transparency)

1 – Skip any pixel matching the alpha-key color

wAlphaColor – Alpha-key color used when transparency is enabled.

bInvert – Color inversion:

0 – Normal colors

1 – Invert all colors

bOverlay – Pixel overlay/blending mode:

0 = NONE – Direct pixel write

1 = OR – Lightens by setting bits

2 = AND – Keeps intersecting bits

3 = XOR – Highlights differences

4 = NAND – Inverted AND; bright overlaps

5 = NOR – Inverted OR; darker result

6 = XNOR – Keeps matching pixels

7 = ADD – Add RGB values; brighter blend

8 = SUB – Subtract RGB values; darker blend

9 = AVG – Average RGB; soft mix

10 = SCR – Screen blend; bright highlights

11 = MUL – Multiply blend; darker result (Photoshop-style Multiply)

12 = CON – Contrast-boost mix; non-linear

Result:

0 – Success

1 – Origin outside visible area

2 – BMP width or height is zero

4 – BMP partially printed outside the visible area

Notes:

Processing order: transparency → inversion → overlay → draw.

Transparency is slower because each pixel must be evaluated individually.

Overlay effects are slower due to pixel read-modify-write behavior.

When global TftPixelCheck is enabled:

Images fully outside the visible area are skipped.

Images partially outside are clipped to screen boundaries.

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