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demo: fix corner case in scout_gfx/icon_painter.h

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The original version of the icon painter would reach beyong the
texture boundaries for textures of even width and height, and when
painting an icon with the width or height of the texture.

In this case, p3 would be set to the same value as p2. However, the code
expects p3 to lie within the middle rectangle. However, in this corner
case, the middle rectangle is actually empty. So no pixel can lie within
it. Hence, p3 is positioned by one pixel to the left outside the middle
rectangle, which violates the assumptions when calculating the clipping
and texture offsets. The patch fixes the problem by reducing the size of
the right column by one pixel. This ensures that exists always a
non-zero middle rectangle.
This commit is contained in:
Norman Feske 2015-11-12 18:21:27 +01:00 committed by Christian Helmuth
parent 6177424fa6
commit ed774253b6
1 changed files with 4 additions and 4 deletions
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8
repos/demo/include/scout_gfx/icon_painter.h
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@ -195,8 +195,8 @@ class Icon_painter
int const y4 = y1 + rect.h() - 1;
int const x2 = x1 + icon_w/2;
int const y2 = y1 + icon_h/2;
int const x3 = Genode::max(x4 - (int)icon_w/2, x2);
int const y3 = Genode::max(y4 - (int)icon_h/2, y2);
int const x3 = Genode::max(x4 - (int)icon_w/2 + 1, x2);
int const y3 = Genode::max(y4 - (int)icon_h/2 + 1, y2);
int const tx1 = 0;
int const ty1 = 0;
@ -204,8 +204,8 @@ class Icon_painter
int const ty4 = icon_h - 1;
int const tx2 = icon_w/2;
int const ty2 = icon_h/2;
int const tx3 = Genode::max(tx4 - (int)icon_w/2, tx2);
int const ty3 = Genode::max(ty4 - (int)icon_h/2, ty2);
int const tx3 = Genode::max(tx4 - (int)icon_w/2 + 1, tx2);
int const ty3 = Genode::max(ty4 - (int)icon_h/2 + 1, ty2);
TPT const *src = icon.pixel() + icon_w*ty1;
unsigned char const *src_a = icon.alpha() + icon_w*ty1;