Scale the colors values of a rectangular array (V41)
Source position: cybergraphics.pas line 163
function ScalePixelArray( |
SrcRect: Pointer; |
SrcW: LongWord; |
SrcH: LongWord; |
SrcMod: LongWord; |
RastPort: PRastPort; |
DestX: LongInt; |
DestY: LongInt; |
DestW: LongWord; |
DestH: LongWord; |
SrcFormat: LongWord |
):LongInt; |
SrcRect |
|
Pointer to an array of pixels from which to fetch the pixel data. The pixel format is specified in SrcFormat |
SrcW |
|
Width of the source rectangle |
SrcH |
|
Height of the source rectangle |
SrcMod |
|
The number of bytes per row in the source rectangle. |
DestX |
|
starting x point in the RastPort |
DestY |
|
starting y point in the RastPort |
DestW |
|
Width of the destination area |
DestH |
|
Height of the destination area |
SrcFormat |
|
pixel format in the source rectangle. Currently supported formats are: RECTFMT_RGB, RECTFMT_RGBA, RECTFMT_ARGB, RECTFMT_LUT8, RECTFMT_GREY8 |
number of pixels plotted
Scale the colors values of a rectangular array of pixels starting at a specified x,y location and continuing through to another x,y location within a certain RastPort
For each pixel in a rectangular region, scale the color values from a linear array of color values into the bitmap used to describe a particular rastport.
Attention
Up to v40, this function only worked on screens depths > 8 bits. You may specify RECTFMT_LUT8 on 8bit screens, too now if v41 is available
Very early v40 revision did not support RECTFMT_LUT8 and RECTFMT_GREY8. Scaling is not very accurate. If you need high quality, use graphics.library/BitMapScale() instead or custom code. The count value returned is totally wrong.
|
Perform raster scaling on a bit map. |