55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
/*
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* \brief Support for Genode::Texture
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* \author Norman Feske
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* \date 2014-08-14
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*/
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/*
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* Copyright (C) 2014-2017 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__GEMS__TEXTURE_RGB565_H_
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#define _INCLUDE__GEMS__TEXTURE_RGB565_H_
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/* Genode includes */
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#include <os/texture.h>
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#include <os/pixel_rgb565.h>
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#include <util/dither_matrix.h>
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namespace Genode {
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template <>
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inline void
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Texture<Pixel_rgb565>::rgba(unsigned char const *rgba, unsigned len, int y)
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{
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if (len > size().w()) len = size().w();
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if (y < 0 || y >= (int)size().h()) return;
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Pixel_rgb565 *dst_pixel = pixel() + y*size().w();
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unsigned char *dst_alpha = alpha() ? alpha() + y*size().w() : 0;
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Dither_matrix::Row dither_row = Dither_matrix::row(y);
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for (unsigned i = 0; i < len; i++) {
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int v = dither_row.value(i) >> 5;
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int r = *rgba++ + v;
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int g = *rgba++ + v;
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int b = *rgba++ + v;
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int a = *rgba++;
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if (a) a += v;
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dst_pixel[i].rgba(min(r, 255), min(g, 255), min(b, 255));
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if (dst_alpha)
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dst_alpha[i] = min(a, 255);
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}
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}
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}
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#endif /* _INCLUDE__GEMS__TEXTURE_RGB565_H_ */
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