[AGG] Question about memory usage on small MCU

[Hugo E. <hu...@sh...>]

I have just started trying to use AGG on a microcontroller with 264kB
memory. My image buffer is 240x240x3 = 172kB, and if I allow for memory for
other stuff, I reckon there's about 50kB of memory free for AGG to use.

However, when I try to run the simple star example, which draws a 5-pointed
star, I get an out-of-memory error. Adding some print statements to the
pod_allocator, I can see that a surprisingly large amount of memory is
being allocated for this simple task:

pod_allocator   512 bytes
pod_allocator  1536 bytes
pod_allocator   512 bytes
pod_allocator  1024 bytes
pod_allocator  2048 bytes
pod_allocator 65536 bytes
pod_allocator  3384 bytes
pod_allocator   944 bytes
pod_allocator  1664 bytes
pod_allocator   104 bytes
pod_allocator   512 bytes
pod_allocator  1536 bytes
pod_allocator   512 bytes
pod_allocator  1024 bytes
pod_allocator  9904 bytes

At one point it allocates 64kB! Just to draw a 5-pointed star. Is this to
be expected, or am I doing something wrong?  Is there some way to make it
use less memory?

double star[] = {50,  3, 20, 101, 95, 35, 5, 39, 80, 92, 50,  3};
SimplePath path(star, sizeof(star) / sizeof(double));
agg::conv_stroke<SimplePath> strokePath(path);
double strokeWidth = 2.0;
strokePath.width(strokeWidth);
strokePath.line_cap(agg::square_cap);
strokePath.line_join(agg::miter_join);
strokePath.miter_limit(strokeWidth);
ras.reset();
ras.add_path(strokePath);
agg::render_scanlines_aa_solid(ras, scanline, rBase, redColor);

Many thanks
Hugo

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