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vcmi/client/renderSDL/CBitmapFont.cpp

193 lines
5.4 KiB
C++

/*
* CBitmapFont.cpp, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#include "StdInc.h"
#include "CBitmapFont.h"
#include "SDL_Extensions.h"
#include "../CGameInfo.h"
#include "../render/Colors.h"
#include "../../lib/CModHandler.h"
#include "../../lib/Languages.h"
#include "../../lib/Rect.h"
#include "../../lib/TextOperations.h"
#include "../../lib/filesystem/Filesystem.h"
#include "../../lib/vcmi_endian.h"
#include "../../lib/VCMI_Lib.h"
#include <SDL_surface.h>
void CBitmapFont::loadModFont(const std::string & modName, const ResourceID & resource)
{
auto data = CResourceHandler::get(modName)->load(resource)->readAll();
std::string modLanguage = CGI->modh->getModLanguage(modName);
std::string modEncoding = Languages::getLanguageOptions(modLanguage).encoding;
uint32_t dataHeight = data.first[5];
maxHeight = std::max(maxHeight, dataHeight);
constexpr size_t symbolsInFile = 0x100;
constexpr size_t baseIndex = 32;
constexpr size_t offsetIndex = baseIndex + symbolsInFile*12;
constexpr size_t dataIndex = offsetIndex + symbolsInFile*4;
for (uint32_t charIndex = 0; charIndex < symbolsInFile; ++charIndex)
{
CodePoint codepoint = TextOperations::getUnicodeCodepoint(static_cast<char>(charIndex), modEncoding);
BitmapChar symbol;
symbol.leftOffset = read_le_u32(data.first.get() + baseIndex + charIndex * 12 + 0);
symbol.width = read_le_u32(data.first.get() + baseIndex + charIndex * 12 + 4);
symbol.rightOffset = read_le_u32(data.first.get() + baseIndex + charIndex * 12 + 8);
symbol.height = dataHeight;
uint32_t pixelDataOffset = read_le_u32(data.first.get() + offsetIndex + charIndex * 4);
uint32_t pixelsCount = dataHeight * symbol.width;
symbol.pixels.resize(pixelsCount);
uint8_t * pixelData = data.first.get() + dataIndex + pixelDataOffset;
std::copy_n(pixelData, pixelsCount, symbol.pixels.data() );
chars[codepoint] = symbol;
}
}
CBitmapFont::CBitmapFont(const std::string & filename):
maxHeight(0)
{
ResourceID resource("data/" + filename, EResType::BMP_FONT);
loadModFont("core", resource);
for(const auto & modName : VLC->modh->getActiveMods())
{
if (CResourceHandler::get(modName)->existsResource(resource))
loadModFont(modName, resource);
}
}
size_t CBitmapFont::getLineHeight() const
{
return maxHeight;
}
size_t CBitmapFont::getGlyphWidth(const char * data) const
{
CodePoint localChar = TextOperations::getUnicodeCodepoint(data, 4);
auto iter = chars.find(localChar);
if (iter == chars.end())
return 0;
return iter->second.leftOffset + iter->second.width + iter->second.rightOffset;
}
bool CBitmapFont::canRepresentCharacter(const char *data) const
{
CodePoint localChar = TextOperations::getUnicodeCodepoint(data, 4);
auto iter = chars.find(localChar);
return iter != chars.end();
}
bool CBitmapFont::canRepresentString(const std::string & data) const
{
for(size_t i=0; i<data.size(); i += TextOperations::getUnicodeCharacterSize(data[i]))
if (!canRepresentCharacter(data.data() + i))
return false;
return true;
}
void CBitmapFont::renderCharacter(SDL_Surface * surface, const BitmapChar & character, const SDL_Color & color, int &posX, int &posY) const
{
Rect clipRect;
CSDL_Ext::getClipRect(surface, clipRect);
posX += character.leftOffset;
CSDL_Ext::TColorPutter colorPutter = CSDL_Ext::getPutterFor(surface, 0);
uint8_t bpp = surface->format->BytesPerPixel;
// start of line, may differ from 0 due to end of surface or clipped surface
int lineBegin = std::max<int>(0, clipRect.y - posY);
int lineEnd = std::min<int>(character.height, clipRect.y + clipRect.h - posY - 1);
// start end end of each row, may differ from 0
int rowBegin = std::max<int>(0, clipRect.x - posX);
int rowEnd = std::min<int>(character.width, clipRect.x + clipRect.w - posX - 1);
//for each line in symbol
for(int dy = lineBegin; dy <lineEnd; dy++)
{
uint8_t *dstLine = (uint8_t*)surface->pixels;
const uint8_t *srcLine = character.pixels.data();
// shift source\destination pixels to current position
dstLine += (posY+dy) * surface->pitch + posX * bpp;
srcLine += dy * character.width;
//for each column in line
for(int dx = rowBegin; dx < rowEnd; dx++)
{
uint8_t* dstPixel = dstLine + dx*bpp;
switch(srcLine[dx])
{
case 1: //black "shadow"
colorPutter(dstPixel, 0, 0, 0);
break;
case 255: //text colour
colorPutter(dstPixel, color.r, color.g, color.b);
break;
default :
break; //transparency
}
}
}
posX += character.width;
posX += character.rightOffset;
}
void CBitmapFont::renderText(SDL_Surface * surface, const std::string & data, const SDL_Color & color, const Point & pos) const
{
if (data.empty())
return;
assert(surface);
int posX = pos.x;
int posY = pos.y;
// Should be used to detect incorrect text parsing. Disabled right now due to some old UI code (mostly pregame and battles)
//assert(data[0] != '{');
//assert(data[data.size()-1] != '}');
SDL_LockSurface(surface);
for(size_t i=0; i<data.size(); i += TextOperations::getUnicodeCharacterSize(data[i]))
{
CodePoint codepoint = TextOperations::getUnicodeCodepoint(data.data() + i, data.size() - i);
auto iter = chars.find(codepoint);
if (iter != chars.end())
renderCharacter(surface, iter->second, color, posX, posY);
}
SDL_UnlockSurface(surface);
}