textures, overlay images, libimago

[demo_prior] / libs / imago2 / src / byteord.c

diff --git a/libs/imago2/src/byteord.c b/libs/imago2/src/byteord.c
new file mode 100644 (file)
index 0000000..8b0a55f
--- /dev/null
+++ b/libs/imago2/src/byteord.c
@@ -0,0 +1,83 @@
+/*
+libimago - a multi-format image file input/output library.
+Copyright (C) 2010-2019 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published
+by the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "byteord.h"
+
+int16_t img_read_int16(struct img_io *io)
+{
+       int16_t v;
+       io->read(&v, 2, io->uptr);
+       return v;
+}
+
+int16_t img_read_int16_inv(struct img_io *io)
+{
+       int16_t v;
+       io->read(&v, 2, io->uptr);
+       return ((v >> 8) & 0xff) | (v << 8);
+}
+
+uint16_t img_read_uint16(struct img_io *io)
+{
+       uint16_t v;
+       io->read(&v, 2, io->uptr);
+       return v;
+}
+
+uint16_t img_read_uint16_inv(struct img_io *io)
+{
+       int16_t v;
+       io->read(&v, 2, io->uptr);
+       return (v >> 8) | (v << 8);
+}
+
+
+void img_write_int16(struct img_io *io, int16_t val)
+{
+       io->write(&val, 2, io->uptr);
+}
+
+void img_write_int16_inv(struct img_io *io, int16_t val)
+{
+       val = ((val >> 8) & 0xff) | (val << 8);
+       io->write(&val, 2, io->uptr);
+}
+
+void img_write_uint16(struct img_io *io, uint16_t val)
+{
+       io->write(&val, 2, io->uptr);
+}
+
+void img_write_uint16_inv(struct img_io *io, uint16_t val)
+{
+       val = (val >> 8) | (val << 8);
+       io->write(&val, 2, io->uptr);
+}
+
+uint32_t img_read_uint32(struct img_io *io)
+{
+       uint32_t v;
+       io->read(&v, 4, io->uptr);
+       return v;
+}
+
+uint32_t img_read_uint32_inv(struct img_io *io)
+{
+       uint32_t v;
+       io->read(&v, 4, io->uptr);
+       return (v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24);
+}