SrcTransBltBuf
Copies pixels from one buffer into the currently active buffer, with source color key transparency
Declaration
void GA_bufferFuncs::SrcTransBltBuf(
GA_buf *buf,
N_int32 srcLeft,
N_int32 srcTop,
N_int32 width,
N_int32 height,
N_int32 dstLeft,
N_int32 dstTop,
N_int32 mix,
GA_color transparent)
Prototype In
snap/graphics.h
Parameters
buf |
SNAP buffer to blit to the active surface |
srcLeft |
Left coordinate of the source rectangle to copy |
srcTop |
Top coordinate of the source rectangle to copy |
width |
Width of the rectangle in pixels |
height |
Height of the rectangle in scanlines |
dstLeft |
Left coordinate of destination |
dstTop |
Top coordinate of destination |
mix |
Mix code for the copy (GA_mixCodesType) |
transparent |
Transparent color for the blit |
Description
This function copies a rectangular region from the source buffer to the active drawing surface, copying from (srcLeft, srcTop, srcLeft+width-1, srcTop+height-1) in the source buffer to (dstLeft, dstTop) in the active buffer. The specified mix is used to combine the pixels in the active buffer along with source color key transparency.
The transparent color passed will be used to mask out pixels in the source bitmap from being written to the destination area. Where a pixel in the source bitmap matches the transparent color, the pixel will not be written to the destination bitmap.
Note: Although you can achieve the same effect of this routine using the generic BitBltBufFx function, this function is provided separately as it is usually a workhorse function for sprite based game applications and needs to be as efficient as possible.
See Also
BitBltBuf, BitBltPattBuf, BitBltColorPattBuf, DstTransBltBuf, BitBltPlaneMaskedBuf, BitBltFxBuf, DrawRectBuf
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