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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include <cstring>
#include <deque>
#include <sstream>
#include "ColorMap.h"
#include "Bitmap.h"
#include "System/FileSystem/FileHandler.h"
#include "System/UnorderedMap.hpp"
#include "System/StringUtil.h"
#include "System/Exceptions.h"
static std::deque<CColorMap> colorMaps;
static spring::unordered_map<std::string, CColorMap*> colorMapsMap;
CR_BIND(CColorMap,)
CR_REG_METADATA(CColorMap, (
CR_MEMBER_UN(map),
CR_MEMBER_UN(xsize),
CR_MEMBER_UN(nxsize),
CR_MEMBER_UN(ysize),
CR_MEMBER_UN(nysize)
))
CColorMap::CColorMap()
: map(2, SColor(128, 128, 128))
, xsize(2)
, nxsize(1)
, ysize(1)
, nysize(0)
{
}
CColorMap::CColorMap(const std::vector<float>& vec)
{
if (vec.size() < 8)
throw content_error("[ColorMap] too few colors in colormap (need at least two RGBA values)");
xsize = (vec.size() - (vec.size() % 4)) / 4;
ysize = 1;
nxsize = xsize - 1;
nysize = ysize - 1;
SColor* cmap = new SColor[xsize];
for (int i = 0; i < xsize; ++i) {
cmap[i] = SColor(&vec[i * 4]);
}
LoadMap(&cmap[0].r, xsize);
delete[] cmap;
}
CColorMap::CColorMap(const std::string& fileName)
{
CBitmap bitmap;
if (!bitmap.Load(fileName))
throw content_error("Could not load texture from file " + fileName);
if (bitmap.compressed || (bitmap.channels != 4) || (bitmap.xsize < 2))
throw content_error("Unsupported bitmap format in file " + fileName);
xsize = bitmap.xsize;
ysize = bitmap.ysize;
nxsize = xsize - 1;
nysize = ysize - 1;
LoadMap(bitmap.GetRawMem(), xsize * ysize);
}
void CColorMap::LoadMap(const unsigned char* buf, int num)
{
map.resize(num);
std::memcpy(&map[0], buf, num * 4);
}
CColorMap* CColorMap::LoadFromBitmapFile(const std::string& fileName)
{
const std::string& lowFilename = StringToLower(fileName);
auto it = colorMapsMap.find(lowFilename);
if (it != colorMapsMap.end())
return it->second;
colorMaps.emplace_back(fileName);
colorMapsMap[lowFilename] = &colorMaps.back();
return &colorMaps.back();
}
CColorMap* CColorMap::LoadFromFloatVector(const std::vector<float>& vec)
{
colorMaps.emplace_back(vec);
return &colorMaps.back();
}
CColorMap* CColorMap::LoadFromDefString(const std::string& dString)
{
std::stringstream stream;
std::vector<float> vec;
stream << dString;
float value;
while (stream >> value) {
vec.push_back(value);
}
CColorMap* map = NULL;
if (vec.empty()) {
map = CColorMap::LoadFromBitmapFile("bitmaps\\" + dString);
} else {
map = CColorMap::LoadFromFloatVector(vec);
}
if (map == NULL) {
throw content_error("[ColorMap::LoadFromDefString] unable to load color-map " + dString);
}
return map;
}
void CColorMap::GetColor(unsigned char* color, float pos)
{
if (pos >= 1.0f) {
*reinterpret_cast<SColor*>(color) = map.back();
return;
}
const float fposn = pos * nxsize;
const int iposn = (int) fposn;
const float fracn = fposn - iposn;
const int aa = (int) (fracn * 256);
const int ia = 256 - aa;
unsigned char* col1 = (unsigned char*) &map[iposn ];
unsigned char* col2 = (unsigned char*) &map[iposn + 1];
color[0] = ((col1[0] * ia) + (col2[0] * aa)) >> 8;
color[1] = ((col1[1] * ia) + (col2[1] * aa)) >> 8;
color[2] = ((col1[2] * ia) + (col2[2] * aa)) >> 8;
color[3] = ((col1[3] * ia) + (col2[3] * aa)) >> 8;
}
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