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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include <array>
#include <cstring> // memcpy
#include "ColorMap.h"
#include "Bitmap.h"
#include "System/Log/ILog.h"
#include "System/Exceptions.h"
#include "System/StringUtil.h"
#include "System/UnorderedMap.hpp"
#include "System/creg/STL_Map.h"
CR_BIND(CColorMap, )
CR_REG_METADATA(CColorMap, (
CR_MEMBER(xsize),
CR_IGNORED(nxsize),
CR_MEMBER(ysize),
CR_IGNORED(map),
CR_SERIALIZER(Serialize),
CR_POSTLOAD(PostLoad)
))
static std::array<CColorMap, 2048 + 2> colorMapsCache;
static spring::unordered_map<std::string, CColorMap*> namedColorMaps;
static size_t numColorMaps = 0;
void CColorMap::InitStatic()
{
namedColorMaps.clear();
namedColorMaps.reserve(colorMapsCache.size() - 2);
// reuse inner ColorMap vectors when reloading
// colorMapsCache.fill({});
for (CColorMap& cm: colorMapsCache) {
cm.Clear();
}
numColorMaps = 0;
}
CColorMap* CColorMap::LoadFromBitmapFile(const std::string& fileName)
{
const auto fn = StringToLower(fileName);
const auto it = namedColorMaps.find(fn);
if (it != namedColorMaps.end())
return it->second;
// hand out a dummy if cache is full
if (numColorMaps >= (colorMapsCache.size() - 2))
return &colorMapsCache[colorMapsCache.size() - 2];
colorMapsCache[numColorMaps] = {fileName};
namedColorMaps[fn] = &colorMapsCache[numColorMaps];
return &colorMapsCache[numColorMaps++];
}
CColorMap* CColorMap::LoadFromRawVector(const float* data, size_t size)
{
CColorMap& cm = colorMapsCache[colorMapsCache.size() - 1];
cm.Clear();
cm.Load(data, size);
// slowish, but gets invoked by /reloadcegs via LoadFromDefString callback
// need to do a cache lookup or numColorMaps quickly spirals out of control
for (size_t i = 0; i < numColorMaps; i++) {
if (colorMapsCache[i].map.size() != cm.map.size())
continue;
if (memcmp(colorMapsCache[i].map.data(), cm.map.data(), cm.map.size() * sizeof(SColor)) == 0)
return &colorMapsCache[i];
}
// ditto
if (numColorMaps >= (colorMapsCache.size() - 2))
return &colorMapsCache[colorMapsCache.size() - 2];
colorMapsCache[numColorMaps].Clear();
colorMapsCache[numColorMaps].Load(data, size);
return &colorMapsCache[numColorMaps++];
}
CColorMap* CColorMap::LoadFromDefString(const std::string& defString)
{
std::array<float, 4096> vec;
size_t idx = 0;
char* pos = const_cast<char*>(defString.c_str());
char* end = nullptr;
vec.fill(0.0f);
for (float val; (val = std::strtof(pos, &end), pos != end && idx < vec.size()); pos = end) {
vec[idx++] = val;
}
if (idx == 0)
return (CColorMap::LoadFromBitmapFile("bitmaps\\" + defString));
return (CColorMap::LoadFromRawVector(vec.data(), idx));
}
CColorMap::CColorMap(const std::string& fileName)
{
CBitmap bitmap;
if (!bitmap.Load(fileName)) {
bitmap.Alloc(2, 2, 4);
LOG_L(L_WARNING, "[ColorMap] could not load texture from file \"%s\"", fileName.c_str());
}
if (bitmap.compressed || (bitmap.channels != 4) || (bitmap.xsize < 2))
throw content_error("[ColorMap] unsupported bitmap format in file " + fileName);
xsize = bitmap.xsize;
ysize = bitmap.ysize;
nxsize = xsize - 1;
LoadMap(bitmap.GetRawMem(), xsize * ysize);
}
void CColorMap::Load(const float* data, size_t size)
{
if (size < 8)
throw content_error("[ColorMap] less than two RGBA colors specified");
xsize = (size - (size % 4)) / 4;
ysize = 1;
nxsize = xsize - 1;
std::array<SColor, 4096> cmap;
for (size_t i = 0, n = std::min(size_t(xsize), cmap.size()); i < n; ++i) {
cmap[i] = SColor(&data[i * 4]);
}
LoadMap(&cmap[0].r, xsize);
}
void CColorMap::LoadMap(const unsigned char* buf, int num)
{
map.clear();
map.resize(num);
std::memcpy(&map[0], buf, num * 4);
}
void CColorMap::GetColor(unsigned char* color, float pos)
{
if (map.empty()) {
// dummy map, just return grey
color[0] = 128;
color[1] = 128;
color[2] = 128;
color[3] = 255;
return;
}
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;
}
#ifdef USING_CREG
void CColorMap::SerializeColorMaps(creg::ISerializer* s)
{
if (!s->IsWriting()) {
for (CColorMap& cm: colorMapsCache) {
cm.Clear();
}
}
s->SerializeInt(&numColorMaps, sizeof(numColorMaps));
for (size_t i = 0; i < numColorMaps; ++i) {
s->SerializeObjectInstance(&colorMapsCache[i], CColorMap::StaticClass());
}
std::unique_ptr<creg::IType> mapType = creg::DeduceType<decltype(namedColorMaps)>::Get();
mapType->Serialize(s, &namedColorMaps);
}
void CColorMap::PostLoad()
{
nxsize = xsize - 1;
}
void CColorMap::Serialize(creg::ISerializer* s)
{
if (!s->IsWriting())
map.resize(xsize * ysize);
s->Serialize(&map[0].r, xsize * ysize * 4);
}
#endif
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