59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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//=============================================================================
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//
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// AGS specific color blending routines for transparency and tinting effects
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//
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//=============================================================================
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#ifndef AGS_ENGINE_GFX_BLENDER_H
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#define AGS_ENGINE_GFX_BLENDER_H
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namespace AGS3 {
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//
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// Allegro's standard alpha blenders result in:
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// - src and dst RGB are combined proportionally to src alpha
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// (src.rgb * src.alpha + dst.rgb * (1 - dst.alpha));
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// - final alpha is zero.
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// This blender is suggested for use with opaque destinations
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// (ones without alpha channel).
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//
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/* Declared in Allegro's color.h:
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void set_alpha_blender();
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*/
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// Customizable alpha blender that uses the supplied alpha value as src alpha,
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// and preserves destination's alpha channel (if there was one);
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void set_my_trans_blender(int r, int g, int b, int a);
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// Additive alpha blender plain copies src over, applying a summ of src and
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// dst alpha values.
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void set_additive_alpha_blender();
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// Opaque alpha blender plain copies src over, applying opaque alpha value.
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void set_opaque_alpha_blender();
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// Sets argb2argb for 32-bit mode, and provides appropriate funcs for blending 32-bit onto 15/16/24-bit destination
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void set_argb2any_blender();
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} // namespace AGS3
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#endif
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