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vcmi/client/renderSDL/CBitmapFont.cpp

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/*
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* 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 "../gui/CGuiHandler.h"
#include "../render/Colors.h"
#include "../render/IScreenHandler.h"
#include "../../lib/Rect.h"
#include "../../lib/filesystem/Filesystem.h"
#include "../../lib/modding/CModHandler.h"
#include "../../lib/texts/Languages.h"
#include "../../lib/texts/TextOperations.h"
#include "../../lib/vcmi_endian.h"
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#include "../../lib/VCMI_Lib.h"
#include <SDL_surface.h>
struct AtlasLayout
{
Point dimensions;
std::map<int, Rect> images;
};
/// Attempts to pack provided list of images into 2d box of specified size
/// Returns resulting layout on success and empty optional on failure
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static std::optional<AtlasLayout> tryAtlasPacking(Point dimensions, const std::map<int, Point> & images)
{
// Simple atlas packing algorithm. Can be extended if needed, however optimal solution is NP-complete problem, so 'perfect' solution is too costly
AtlasLayout result;
result.dimensions = dimensions;
// a little interval to prevent potential 'bleeding' into adjacent symbols
// should be unnecessary for base game, but may be needed for upscaled filters
constexpr int interval = 1;
int currentHeight = 0;
int nextHeight = 0;
int currentWidth = 0;
for (auto const & image : images)
{
int nextWidth = currentWidth + image.second.x + interval;
if (nextWidth > dimensions.x)
{
currentHeight = nextHeight;
currentWidth = 0;
nextWidth = currentWidth + image.second.x + interval;
}
nextHeight = std::max(nextHeight, currentHeight + image.second.y + interval);
if (nextHeight > dimensions.y)
return std::nullopt; // failure - ran out of space
result.images[image.first] = Rect(Point(currentWidth, currentHeight), image.second);
currentWidth = nextWidth;
}
return result;
}
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/// Arranges images to fit into texture atlas with automatic selection of image size
/// Returns images arranged into 2d box
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static AtlasLayout doAtlasPacking(const std::map<int, Point> & images)
{
// initial size of an atlas. Smaller size won't even fit tiniest H3 font
Point dimensions(128, 128);
for (;;)
{
auto result = tryAtlasPacking(dimensions, images);
if (result)
return *result;
// else - packing failed. Increase atlas size and try again
// increase width and height in alternating form: (64,64) -> (128,64) -> (128,128) ...
if (dimensions.x > dimensions.y)
dimensions.y *= 2;
else
dimensions.x *= 2;
}
}
void CBitmapFont::loadModFont(const std::string & modName, const ResourcePath & resource, std::unordered_map<CodePoint, EntryFNT> & loadedChars)
{
if (!CResourceHandler::get(modName)->existsResource(resource))
{
logGlobal->error("Failed to load font %s from mod %s", resource.getName(), modName);
return;
}
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);
EntryFNT 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() );
loadedChars[codepoint] = symbol;
}
}
CBitmapFont::CBitmapFont(const std::string & filename):
maxHeight(0)
{
ResourcePath resource("data/" + filename, EResType::BMP_FONT);
std::unordered_map<CodePoint, EntryFNT> loadedChars;
loadModFont("core", resource, loadedChars);
for(const auto & modName : VLC->modh->getActiveMods())
{
if (CResourceHandler::get(modName)->existsResource(resource))
loadModFont(modName, resource, loadedChars);
}
std::map<int, Point> atlasSymbol;
for (auto const & symbol : loadedChars)
atlasSymbol[symbol.first] = Point(symbol.second.width, symbol.second.height);
auto atlas = doAtlasPacking(atlasSymbol);
atlasImage = SDL_CreateRGBSurface(0, atlas.dimensions.x, atlas.dimensions.y, 8, 0, 0, 0, 0);
assert(atlasImage->format->palette != nullptr);
assert(atlasImage->format->palette->ncolors == 256);
atlasImage->format->palette->colors[0] = { 0, 255, 255, SDL_ALPHA_OPAQUE }; // transparency
atlasImage->format->palette->colors[1] = { 0, 0, 0, SDL_ALPHA_OPAQUE }; // black shadow
CSDL_Ext::fillSurface(atlasImage, CSDL_Ext::toSDL(Colors::CYAN));
CSDL_Ext::setColorKey(atlasImage, CSDL_Ext::toSDL(Colors::CYAN));
for (size_t i = 2; i < atlasImage->format->palette->ncolors; ++i)
atlasImage->format->palette->colors[i] = { 255, 255, 255, SDL_ALPHA_OPAQUE };
for (auto const & symbol : loadedChars)
{
BitmapChar storedEntry;
storedEntry.leftOffset = symbol.second.leftOffset;
storedEntry.rightOffset = symbol.second.rightOffset;
storedEntry.positionInAtlas = atlas.images.at(symbol.first);
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// Copy pixel data to atlas
uint8_t *dstPixels = static_cast<uint8_t*>(atlasImage->pixels);
uint8_t *dstLine = dstPixels + storedEntry.positionInAtlas.y * atlasImage->pitch;
uint8_t *dst = dstLine + storedEntry.positionInAtlas.x;
for (size_t i = 0; i < storedEntry.positionInAtlas.h; ++i)
{
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const uint8_t *srcPtr = symbol.second.pixels.data() + i * storedEntry.positionInAtlas.w;
uint8_t * dstPtr = dst + i * atlasImage->pitch;
std::copy_n(srcPtr, storedEntry.positionInAtlas.w, dstPtr);
}
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chars[symbol.first] = storedEntry;
}
if (GH.screenHandler().getScalingFactor() != 1)
{
auto scaledSurface = CSDL_Ext::scaleSurfaceIntegerFactor(atlasImage, GH.screenHandler().getScalingFactor());
SDL_FreeSurface(atlasImage);
atlasImage = scaledSurface;
}
}
CBitmapFont::~CBitmapFont()
{
SDL_FreeSurface(atlasImage);
}
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.positionInAtlas.w + 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 ColorRGBA & color, int &posX, int &posY) const
{
int scalingFactor = GH.screenHandler().getScalingFactor();
posX += character.leftOffset * scalingFactor;
auto sdlColor = CSDL_Ext::toSDL(color);
if (atlasImage->format->palette)
SDL_SetPaletteColors(atlasImage->format->palette, &sdlColor, 255, 1);
else
SDL_SetSurfaceColorMod(atlasImage, color.r, color.g, color.b);
CSDL_Ext::blitSurface(atlasImage, character.positionInAtlas * scalingFactor, surface, Point(posX, posY));
posX += character.positionInAtlas.w * scalingFactor;
posX += character.rightOffset * scalingFactor;
}
void CBitmapFont::renderText(SDL_Surface * surface, const std::string & data, const ColorRGBA & color, const Point & pos) const
{
if (data.empty())
return;
assert(surface);
int posX = pos.x;
int posY = pos.y;
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);
}
}