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Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST) From: "Mattias Engdeg?rd" Subject: bug in SDL_GetRGB/GetRGBA There's an embarrassing bug in GetRGB/GetRGBA which apparently has been there for years. It incorrectly converts colours with < 8 bits/channel. It came to my attention today in #sdl. What it does now is (for each channel): rv = (pixel & fmt->Rmask) >> fmt->Rshift; *r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss)); which is wrong; the last line should be *r = (rv << fmt->Rloss) + (rv >> (8 - (fmt->Rloss << 1)));
author Sam Lantinga <slouken@libsdl.org>
date Tue, 12 Aug 2003 15:17:20 +0000
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1 ###########################################################################
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2 #
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3 # Some consistent rules for building asm files:
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5 STRIP_FPIC = sh $(top_srcdir)/strip_fPIC.sh
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7 SUFFIXES = .asm
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9 .asm.lo:
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10 $(LIBTOOL) --mode=compile $(STRIP_FPIC) $(NASM) @NASMFLAGS@ $< -o $*.o
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12 ###########################################################################
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14 # The hermes library target
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15 noinst_LTLIBRARIES = libhermes.la
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17 libhermes_la_SOURCES = $(PORTABLE_SRCS)
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18 am_libhermes_la_OBJECTS = \
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19 mmx_main.lo \
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20 mmxp2_32.lo \
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21 x86_main.lo \
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22 x86p_16.lo \
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23 x86p_32.lo
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25 # The hermes library sources
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26 PORTABLE_SRCS = \
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27 mmx_main.asm \
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28 mmxp2_32.asm \
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29 x86_main.asm \
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30 x86p_16.asm \
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31 x86p_32.asm \
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32 \
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33 HeadMMX.h \
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34 HeadX86.h
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35
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36 EXTRA_DIST = \
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37 COPYING.LIB \
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38 README
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