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// Copyright (C) 1999-2017
// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
// For conditions of distribution and use, see copyright notice in "copyright"
#include "truecolor8.h"
#include "util.h"
TrueColor8::TrueColor8(Visual* visual)
{
#if !(_WIN32)
rx_ = visual->red_mask;
gx_ = visual->green_mask;
bx_ = visual->blue_mask;
#endif
#if _WIN32
// windows masks are plain wrong
rx_ = 0xE0;
gx_ = 0x18;
bx_ = 0x07;
#endif
rm_ = decodeMask((unsigned char)rx_, &rs_);
gm_ = decodeMask((unsigned char)rx_, &gs_);
bm_ = decodeMask((unsigned char)rx_, &bs_);
}
unsigned char TrueColor8::decodeMask(unsigned char mask, int* s)
{
*s=0;
for (int i=0; i<8; i++, (*s)++) {
if (mask & 0x80)
break;
mask <<= 1;
}
return mask;
}
void TrueColor8::encodeTrueColor(XColor* src, char* dest, XImage* ximage)
{
*dest =
((((unsigned char)src->blue) & bm_) >> bs_) |
((((unsigned char)src->green) & gm_) >> gs_) |
((((unsigned char)src->red) & rm_) >> rs_);
}
void TrueColor8::decodeTrueColor(char* src, XColor* dest, XImage* ximage)
{
dest->red = (unsigned short)((*src & rx_) >> rs_);
dest->green = (unsigned short)((*src & gx_) >> gs_);
dest->blue = (unsigned short)((*src & bx_) >> bs_);
}
void TrueColor8::encodeTrueColor(unsigned char* src, XImage* ximage)
{
int& width = ximage->width;
int& height = ximage->height;
char* data = ximage->data;
const unsigned char* ptr = src;
for (int j=0; j<height; j++) {
char* dest = data + j*ximage->bytes_per_line;
for (int i=0; i<width; i++, dest++, ptr+=3)
*dest =
((ptr[0] & rm_) >> rs_) |
((ptr[1] & gm_) >> gs_) |
((ptr[2] & bm_) >> bs_);
}
}
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