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vcmi/client/renderSDL/CBitmapHanFont.cpp

128 lines
4.0 KiB
C++

/*
* CBitmapHanFont.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 "CBitmapHanFont.h"
#include "CBitmapFont.h"
#include "SDL_Extensions.h"
#include "../../lib/filesystem/Filesystem.h"
#include "../../lib/json/JsonNode.h"
#include "../../lib/TextOperations.h"
#include "../../lib/Rect.h"
#include <SDL_surface.h>
size_t CBitmapHanFont::getCharacterDataOffset(size_t index) const
{
size_t rowSize = (size + 7) / 8; // 1 bit per pixel, rounded up
size_t charSize = rowSize * size; // glyph contains "size" rows
return index * charSize;
}
size_t CBitmapHanFont::getCharacterIndex(ui8 first, ui8 second) const
{
if (second > 0x7f )
second--;
return (first - 0x81) * (12*16 - 2) + (second - 0x40);
}
void CBitmapHanFont::renderCharacter(SDL_Surface * surface, int characterIndex, const ColorRGBA & color, int &posX, int &posY) const
{
//TODO: somewhat duplicated with CBitmapFont::renderCharacter();
Rect clipRect;
CSDL_Ext::getClipRect(surface, clipRect);
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)size, clipRect.y + clipRect.h - posY);
// start end end of each row, may differ from 0
int rowBegin = std::max<int>(0, clipRect.x - posX);
int rowEnd = std::min<int>((int)size, clipRect.x + clipRect.w - posX);
//for each line in symbol
for(int dy = lineBegin; dy <lineEnd; dy++)
{
uint8_t *dstLine = (uint8_t*)surface->pixels;
uint8_t *source = data.first.get() + getCharacterDataOffset(characterIndex);
// shift source\destination pixels to current position
dstLine += (posY+dy) * surface->pitch + posX * bpp;
source += ((size + 7) / 8) * dy;
//for each column in line
for(int dx = rowBegin; dx < rowEnd; dx++)
{
// select current bit in bitmap
int bit = (source[dx / 8] << (dx % 8)) & 0x80;
uint8_t* dstPixel = dstLine + dx*bpp;
if (bit != 0)
colorPutter(dstPixel, color.r, color.g, color.b);
}
}
posX += (int)size + 1;
}
void CBitmapHanFont::renderText(SDL_Surface * surface, const std::string & data, const ColorRGBA & color, const Point & pos) const
{
int posX = pos.x;
int posY = pos.y;
SDL_LockSurface(surface);
for(size_t i=0; i<data.size(); i += TextOperations::getUnicodeCharacterSize(data[i]))
{
std::string localChar = TextOperations::fromUnicode(data.substr(i, TextOperations::getUnicodeCharacterSize(data[i])), "GBK");
if (localChar.size() == 1)
fallback->renderCharacter(surface, fallback->chars[ui8(localChar[0])], color, posX, posY);
if (localChar.size() == 2)
renderCharacter(surface, (int)getCharacterIndex(localChar[0], localChar[1]), color, posX, posY);
}
SDL_UnlockSurface(surface);
}
CBitmapHanFont::CBitmapHanFont(const JsonNode &config):
fallback(new CBitmapFont(config["fallback"].String())),
data(CResourceHandler::get()->load(ResourcePath("data/" + config["name"].String(), EResType::OTHER))->readAll()),
size((size_t)config["size"].Float())
{
// basic tests to make sure that fonts are OK
// 1) fonts must contain 190 "sections", 126 symbols each.
assert(getCharacterIndex(0xfe, 0xff) == 190*126);
// 2) ensure that font size is correct - enough to fit all possible symbols
assert(getCharacterDataOffset(getCharacterIndex(0xfe, 0xff)) == data.second);
}
size_t CBitmapHanFont::getLineHeight() const
{
return std::max(size + 1, fallback->getLineHeight());
}
size_t CBitmapHanFont::getGlyphWidth(const char * data) const
{
std::string localChar = TextOperations::fromUnicode(std::string(data, TextOperations::getUnicodeCharacterSize(data[0])), "GBK");
if (localChar.size() == 1)
return fallback->getGlyphWidth(data);
if (localChar.size() == 2)
return size + 1;
return 0;
}