thirdparty/scummvm
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ANDROID: Set correct blending function

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Overlays with alpha channel in ScummVM use pre-multiplied alpha.
Thus, is it necessary to set the source blend function to ONE, not
SOURCE_ALPHA.

While there is no firm decision on the texture format to be used to
cursors, make sure to set the key color to R=G=B=A=0.0, so that it
can be used with either pre-multiplied or non-pre-multiplied blending.
This commit is contained in:
Marcus Comstedt 2014-01-10 20:05:32 +01:00
parent 4b81b1299d
commit dd84867997
1 changed files with 4 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

8
backends/platform/android/gfx.cpp
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@ -233,7 +233,7 @@ void OSystem_Android::initViewport() {
GLCALL(glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST));
GLCALL(glEnable(GL_BLEND));
GLCALL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
GLCALL(glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA));
GLCALL(glEnableClientState(GL_VERTEX_ARRAY));
GLCALL(glEnableClientState(GL_TEXTURE_COORD_ARRAY));
@ -726,7 +726,7 @@ void OSystem_Android::setMouseCursor(const void *buf, uint w, uint h,
_mouse_keycolor = keycolor;
p = _mouse_texture_palette->palette() + _mouse_keycolor * 2;
WRITE_UINT16(p, READ_UINT16(p) & ~1);
WRITE_UINT16(p, 0);
}
if (w == 0 || h == 0)
@ -779,7 +779,7 @@ void OSystem_Android::setCursorPaletteInternal(const byte *colors,
WRITE_UINT16(p, pf.RGBToColor(colors[0], colors[1], colors[2]));
p = _mouse_texture_palette->palette() + _mouse_keycolor * 2;
WRITE_UINT16(p, READ_UINT16(p) & ~1);
WRITE_UINT16(p, 0);
}
void OSystem_Android::setCursorPalette(const byte *colors,
@ -821,7 +821,7 @@ void OSystem_Android::disableCursorPalette() {
}
byte *p = _mouse_texture_palette->palette() + _mouse_keycolor * 2;
WRITE_UINT16(p, READ_UINT16(p) & ~1);
WRITE_UINT16(p, 0);
}
}