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STR #161
| Application: | FLTK Library |
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| Status: | 1 - Closed w/Resolution |
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| Priority: | 2 - Low, e.g. a documentation error or undocumented side-effect |
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| Scope: | 2 - Specific to an operating system |
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| Subsystem: | MacOS |
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| Summary: | OSX fl_read_image() doesn't do anything |
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| Version: | 1.1.4rc2 |
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| Created By: | yves.usson |
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| Assigned To: | mike |
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| Fix Version: | 1.1.4 |
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| Update Notification: | |
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Trouble Report Files:
No files
Trouble Report Comments:
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| #1 | yves.usson
10:13 Sep 08, 2003 |
| Hi
Here is the bit of code I wrote to have the fl_read_image_mac working.
I send you the code directly because I don't know how to use CVS and all this stuff.
I have tested it quickly and it does what I expected...
There it is :
//
// 'fl_read_image()' - Read an image from the current window.
//
uchar * // O - Pixel buffer or NULL if failed
fl_read_image(uchar *p, // I - Pixel buffer or NULL to allocate
int x, // I - Left position
int y, // I - Top position
int w, // I - Width of area to read
int h, // I - Height of area to read
int alpha) { // I - Alpha value for image (0 for none)
Rect src;
GWorldPtr gWorld = fl_create_offscreen(w,h);
if (! gWorld ) return 0;
src.top = y; src.left = x; src.bottom = y+h; src.right = x+w;
Rect dst;
dst.top = 0; dst.left = 0; dst.bottom = h; dst.right = w;
GrafPtr srcPort; GetPort(&srcPort);
RGBColor rgb;
rgb.red = 0xffff; rgb.green = 0xffff; rgb.blue = 0xffff;
RGBBackColor( &rgb );
rgb.red = 0x0000; rgb.green = 0x0000; rgb.blue = 0x0000;
RGBForeColor( &rgb );
CopyBits(GetPortBitMapForCopyBits(srcPort), GetPortBitMapForCopyBits(gWorld), &src, &dst, srcCopy, 0L);
SetGWorld( gWorld, 0 ); // sets the correct port
PixMapHandle pm = GetGWorldPixMap(gWorld);
LockPixels( pm );
uchar *base = (uchar*)GetPixBaseAddr( pm );
int rowBytes = (*pm)->rowBytes & 0x3fff;
uchar *pdest = p;
for (int idy = 0; idy < h; idy ++)
{
uchar *psrce = base + idy * rowBytes;
for (int idx = 0; idx < w; idx ++)
{
psrce++; // may this should be taken into account if alpha != 0 !!!!!
*pdest++ = *psrce++;
*pdest++ = *psrce++;
*pdest++ = *psrce++;
}
}
UnlockPixels(pm);
fl_delete_offscreen(gWorld);
return p;
}
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| #2 | mike
08:23 Sep 09, 2003 |
| Thanks, I've revised your implementation to correctly support alpha and allocating the pixel buffer if NULL and commited to CVS for the 1.1.4 release. | |
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