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This utility eases the application of the 'blit' function when using the 'Texture' and 'Surface' types.
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/*
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* \brief Functor for blitting textures on a surface
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* \author Norman Feske
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* \date 2020-07-02
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*/
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/*
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* Copyright (C) 2020 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__BLIT__PAINTER_H_
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#define _INCLUDE__BLIT__PAINTER_H_
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#include <blit/blit.h>
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#include <os/texture.h>
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struct Blit_painter
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{
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typedef Genode::Surface_base::Point Point;
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typedef Genode::Surface_base::Rect Rect;
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template <typename PT>
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static inline void paint(Genode::Surface<PT> &surface,
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Genode::Texture<PT> const &texture,
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Point position)
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{
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Rect const clipped = Rect::intersect(Rect(position, texture.size()),
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surface.clip());
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if (!clipped.valid())
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return;
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int const src_w = texture.size().w();
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int const dst_w = surface.size().w();
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/* calculate offset of first texture pixel to copy */
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unsigned long const tex_start_offset = (clipped.y1() - position.y())*src_w
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+ clipped.x1() - position.x();
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/* start address of source pixels */
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PT const * const src = texture.pixel() + tex_start_offset;
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/* start address of destination pixels */
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PT * const dst = surface.addr() + clipped.y1()*dst_w + clipped.x1();
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blit(src, src_w*sizeof(PT),
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dst, dst_w*sizeof(PT),
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clipped.w()*sizeof(PT), clipped.h());
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surface.flush_pixels(clipped);
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}
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};
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#endif /* _INCLUDE__BLIT__PAINTER_H_ */
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