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SetSrc only makes sense if it's image.Uniform #6

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What steps will reproduce the problem?
1. Use a non-image.Uniform image in SetSrc.
2. Call freetype.DrawString

What is the expected output? What do you see instead?
I'd expect that the src passed to c.SetSrc gets composited with the destination 
with the two images aligned.

Instead, for each glyph, a region (0, 0) to (w, h) gets used from src, where w, 
h are the dimensions of the glyph, with the result that the actual colors taken 
from src depending on the height of the rendered glyph and adjacent glyphs are 
inconsistently colored.

What version of the product are you using? On what operating system?
Lion on mac, but I'm sure that's irrelevant.


Please provide any additional information below.

In: http://code.google.com/p/freetype-go/source/browse/freetype/freetype.go#212
I think image.ZP should be dr.Min, or possibly adjusted to align src.Min and 
dst.Min.
The comment would need fixing too to specify the meaning of the SetSrc value.

Attached is a variant of one of the example files that exhibits the problem. 
I've tried to make the colors as nasty as possible to make the problem visible. 
I've also attached a png with the output.

Original issue reported on code.google.com by [email protected] on 1 Aug 2012 at 7:56

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