98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/*
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* \brief Utilities for working with textures
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* \author Norman Feske
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* \date 2014-08-21
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*/
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/*
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* Copyright (C) 2014 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 General Public License version 2.
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*/
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#ifndef _INCLUDE__GEMS__TEXTURE_UTILS_H_
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#define _INCLUDE__GEMS__TEXTURE_UTILS_H_
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#include <os/texture.h>
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template <typename PT>
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static void scale(Genode::Texture<PT> const &src, Genode::Texture<PT> &dst)
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{
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/* sanity check to prevent division by zero */
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if (dst.size().count() == 0)
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return;
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Genode::size_t const row_num_bytes = dst.size().w()*4;
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unsigned char *row = (unsigned char *)Genode::env()->heap()->alloc(row_num_bytes);
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unsigned const mx = (src.size().w() << 16) / dst.size().w();
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unsigned const my = (src.size().h() << 16) / dst.size().h();
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for (unsigned y = 0, src_y = 0; y < dst.size().h(); y++, src_y += my) {
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unsigned const src_line_offset = src.size().w()*(src_y >> 16);
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PT const *pixel_line = src.pixel() + src_line_offset;
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unsigned char const *alpha_line = src.alpha() + src_line_offset;
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unsigned char *d = row;
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for (unsigned x = 0, src_x = 0; x < dst.size().w(); x++, src_x += mx) {
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unsigned const pixel_offset = src_x >> 16;
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PT const pixel = pixel_line[pixel_offset];
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unsigned char const alpha = alpha_line[pixel_offset];
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*d++ = pixel.r();
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*d++ = pixel.g();
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*d++ = pixel.b();
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*d++ = alpha;
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}
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dst.rgba(row, dst.size().w(), y);
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}
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Genode::env()->heap()->free(row, row_num_bytes);
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}
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template <typename SRC_PT, typename DST_PT>
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static void convert_pixel_format(Genode::Texture<SRC_PT> const &src,
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Genode::Texture<DST_PT> &dst,
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unsigned alpha)
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{
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/* sanity check */
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if (src.size() != dst.size())
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return;
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Genode::size_t const row_num_bytes = dst.size().w()*4;
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unsigned char *row = (unsigned char *)Genode::env()->heap()->alloc(row_num_bytes);
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/* shortcuts */
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unsigned const w = dst.size().w(), h = dst.size().h();
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for (unsigned y = 0, line_offset = 0; y < h; y++, line_offset += w) {
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SRC_PT const *src_pixel = src.pixel() + line_offset;
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unsigned char const *src_alpha = src.alpha() + line_offset;
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/* fill row buffer with values from source texture */
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unsigned char *d = row;
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for (unsigned x = 0; x < w; x++, src_pixel++, src_alpha++) {
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*d++ = src_pixel->r();
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*d++ = src_pixel->g();
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*d++ = src_pixel->b();
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*d++ = (*src_alpha * alpha) >> 8;
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}
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/* assign row to destination texture */
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dst.rgba(row, w, y);
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}
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Genode::env()->heap()->free(row, row_num_bytes);
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}
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#endif /* _INCLUDE__GEMS__TEXTURE_UTILS_H_ */
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