pnx1500 NXP Semiconductors, pnx1500 Datasheet - Page 624

• Manufacturer Part Number: pnx1500
• Description: Pnx15xx Series Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
PNX15XX_SER_3
Product data sheet
// fetch a source pixel into Src
if (BltCtl.SRC == 0)
// fetch src pixel from system memory
....
else if (BltCtl.SRC == 1)
// src data is color from CPU
Src= HostData[31:0]
else if (BltCtl.SRC == 4)
begin
// fetch 4 bits of alpha from host, expand to 8 bits
Src.alpha = (HostData[3:0] << 4) | HostData[3:0] ;
Src.red = HAlphaColor.red
Src.green = HAlphaColor.green
Src.blue = HAlphaColor.blue
end
else if (BltCtl.SRC == 5)
begin
// fetch 8 bits of alpha from host
Src.alpha = HostData[7:0] ;
Src.red = HAlphaColor.red
Src.green = HAlphaColor.green
Src.blue = HAlphaColor.blue
end
else if (BltCtl.Src == 6)
// set src to 1 if no src data.
begin
Src.red = HAlphaColor.red
Src.green = HAlphaColor.green
Src.blue = HAlphaColor.blue
Src.alpha = HAlphaColor.alpha
End
// copy mono foreground info into the SurfAlpha
SurfAlpha = MonoHostFColor
// handle src bitmaps without alpha values
if (BltCtl.A[1:0] == 3 || (PixelSize==16 && PFormat == 0) )
Src.alpha = 1;
// handle non-premultiplied source pixels
if (BltCtl.A[1:0] == 1)
begin
Src.red *= Src.alpha ;
Src.green *= Src.alpha ;
Src.blue *= Src.alpha ;
end
// scale the src with the surface alpha values
Src.red *= SurfAlpha.red;
Src.green *= SurfAlpha.green;
Src.blue *= SurfAlpha.blue;
Src.alpha *= SurfAlpha.alpha
Rev. 3 — 17 March 2006
Chapter 20: 2D Drawing Engine
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX15xx Series
20-8