mirror of https://github.com/axmolengine/axmol.git
465 lines
13 KiB
C++
465 lines
13 KiB
C++
#include <string.h>
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#include <algorithm>
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#include <vector>
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#include <string>
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#include <sstream>
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#include <fontconfig/fontconfig.h>
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#include "platform/CCFileUtils.h"
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#include "platform/CCPlatformMacros.h"
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#define __CC_PLATFORM_IMAGE_CPP__
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#include "platform/CCImageCommon_cpp.h"
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#include "platform/CCImage.h"
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#include "platform/linux/CCApplication.h"
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#include "ft2build.h"
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#include "CCStdC.h"
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#include FT_FREETYPE_H
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using namespace std;
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// as FcFontMatch is quite an expensive call, cache the results of getFontFile
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static std::map<std::string, std::string> fontCache;
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struct LineBreakGlyph {
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FT_UInt glyphIndex;
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int paintPosition;
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int glyphWidth;
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int bearingX;
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int kerning;
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int horizAdvance;
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};
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struct LineBreakLine {
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LineBreakLine() : lineWidth(0) {}
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std::vector<LineBreakGlyph> glyphs;
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int lineWidth;
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void reset() {
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glyphs.clear();
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lineWidth = 0;
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}
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void calculateWidth() {
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lineWidth = 0;
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if ( glyphs.empty() == false ) {
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lineWidth = glyphs.at(glyphs.size() - 1).paintPosition + glyphs.at(glyphs.size() - 1).glyphWidth;
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}
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}
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};
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NS_CC_BEGIN
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class BitmapDC
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{
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public:
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BitmapDC() {
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libError = FT_Init_FreeType( &library );
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FcInit();
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_data = NULL;
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reset();
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}
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~BitmapDC() {
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FT_Done_FreeType(library);
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FcFini();
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//data will be deleted by Image
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// if (_data) {
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// delete _data;
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// }
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reset();
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}
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void reset() {
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iMaxLineWidth = 0;
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iMaxLineHeight = 0;
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textLines.clear();
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}
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int utf8(char **p)
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{
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if ((**p & 0x80) == 0x00)
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{
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int a = *((*p)++);
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return a;
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}
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if ((**p & 0xE0) == 0xC0)
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{
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int a = *((*p)++) & 0x1F;
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int b = *((*p)++) & 0x3F;
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return (a << 6) | b;
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}
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if ((**p & 0xF0) == 0xE0)
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{
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int a = *((*p)++) & 0x0F;
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int b = *((*p)++) & 0x3F;
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int c = *((*p)++) & 0x3F;
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return (a << 12) | (b << 6) | c;
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}
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if ((**p & 0xF8) == 0xF0)
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{
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int a = *((*p)++) & 0x07;
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int b = *((*p)++) & 0x3F;
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int c = *((*p)++) & 0x3F;
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int d = *((*p)++) & 0x3F;
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return (a << 18) | (b << 12) | (c << 8) | d;
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}
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return 0;
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}
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bool isBreakPoint(FT_UInt currentCharacter, FT_UInt previousCharacter) {
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if ( previousCharacter == '-' || previousCharacter == '/' || previousCharacter == '\\' ) {
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// we can insert a line break after one of these characters
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return true;
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}
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return false;
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}
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bool divideString(FT_Face face, const char* sText, int iMaxWidth, int iMaxHeight) {
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const char* pText = sText;
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textLines.clear();
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iMaxLineWidth = 0;
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FT_UInt unicode;
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FT_UInt prevCharacter = 0;
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FT_UInt glyphIndex = 0;
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FT_UInt prevGlyphIndex = 0;
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FT_Vector delta;
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LineBreakLine currentLine;
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int currentPaintPosition = 0;
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int lastBreakIndex = -1;
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bool hasKerning = FT_HAS_KERNING( face );
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while ((unicode=utf8((char**)&pText))) {
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if (unicode == '\n') {
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currentLine.calculateWidth();
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iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
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textLines.push_back(currentLine);
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currentLine.reset();
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prevGlyphIndex = 0;
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prevCharacter = 0;
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lastBreakIndex = -1;
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currentPaintPosition = 0;
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continue;
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}
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if ( isBreakPoint(unicode, prevCharacter) ) {
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lastBreakIndex = currentLine.glyphs.size() - 1;
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}
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glyphIndex = FT_Get_Char_Index(face, unicode);
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if (FT_Load_Glyph(face, glyphIndex, FT_LOAD_DEFAULT)) {
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return false;
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}
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if (isspace(unicode)) {
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currentPaintPosition += face->glyph->metrics.horiAdvance >> 6;
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prevGlyphIndex = glyphIndex;
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prevCharacter = unicode;
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lastBreakIndex = currentLine.glyphs.size();
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continue;
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}
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LineBreakGlyph glyph;
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glyph.glyphIndex = glyphIndex;
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glyph.glyphWidth = face->glyph->metrics.width >> 6;
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glyph.bearingX = face->glyph->metrics.horiBearingX >> 6;
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glyph.horizAdvance = face->glyph->metrics.horiAdvance >> 6;
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glyph.kerning = 0;
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if (prevGlyphIndex != 0 && hasKerning) {
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FT_Get_Kerning(face, prevGlyphIndex, glyphIndex, FT_KERNING_DEFAULT, &delta);
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glyph.kerning = delta.x >> 6;
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}
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if (iMaxWidth > 0 && currentPaintPosition + glyph.bearingX + glyph.kerning + glyph.glyphWidth > iMaxWidth) {
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int glyphCount = currentLine.glyphs.size();
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if ( lastBreakIndex >= 0 && lastBreakIndex < glyphCount && currentPaintPosition + glyph.bearingX + glyph.kerning + glyph.glyphWidth - currentLine.glyphs.at(lastBreakIndex).paintPosition < iMaxWidth ) {
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// we insert a line break at our last break opportunity
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std::vector<LineBreakGlyph> tempGlyphs;
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std::vector<LineBreakGlyph>::iterator it = currentLine.glyphs.begin();
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std::advance(it, lastBreakIndex);
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tempGlyphs.insert(tempGlyphs.begin(), it, currentLine.glyphs.end());
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currentLine.glyphs.erase(it, currentLine.glyphs.end());
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currentLine.calculateWidth();
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iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
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textLines.push_back(currentLine);
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currentLine.reset();
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currentPaintPosition = 0;
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for ( it = tempGlyphs.begin(); it != tempGlyphs.end(); it++ ) {
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if ( currentLine.glyphs.empty() ) {
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currentPaintPosition = -(*it).bearingX;
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(*it).kerning = 0;
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}
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(*it).paintPosition = currentPaintPosition + (*it).bearingX + (*it).kerning;
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currentLine.glyphs.push_back((*it));
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currentPaintPosition += (*it).kerning + (*it).horizAdvance;
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}
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} else {
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// the current word is too big to fit into one line, insert line break right here
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currentPaintPosition = 0;
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glyph.kerning = 0;
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currentLine.calculateWidth();
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iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
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textLines.push_back(currentLine);
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currentLine.reset();
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}
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prevGlyphIndex = 0;
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prevCharacter = 0;
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lastBreakIndex = -1;
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} else {
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prevGlyphIndex = glyphIndex;
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prevCharacter = unicode;
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}
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if ( currentLine.glyphs.empty() ) {
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currentPaintPosition = -glyph.bearingX;
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}
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glyph.paintPosition = currentPaintPosition + glyph.bearingX + glyph.kerning;
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currentLine.glyphs.push_back(glyph);
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currentPaintPosition += glyph.kerning + glyph.horizAdvance;
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}
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if ( currentLine.glyphs.empty() == false ) {
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currentLine.calculateWidth();
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iMaxLineWidth = max(iMaxLineWidth, currentLine.lineWidth);
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textLines.push_back(currentLine);
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}
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return true;
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}
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/**
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* compute the start pos of every line
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*/
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int computeLineStart(FT_Face face, Image::TextAlign eAlignMask, int line) {
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int lineWidth = textLines.at(line).lineWidth;
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if (eAlignMask == Image::TextAlign::CENTER || eAlignMask == Image::TextAlign::TOP || eAlignMask == Image::TextAlign::BOTTOM) {
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return (iMaxLineWidth - lineWidth) / 2;
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} else if (eAlignMask == Image::TextAlign::RIGHT || eAlignMask == Image::TextAlign::TOP_RIGHT || eAlignMask == Image::TextAlign::BOTTOM_RIGHT) {
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return (iMaxLineWidth - lineWidth);
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}
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// left or other situation
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return 0;
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}
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int computeLineStartY( FT_Face face, Image::TextAlign eAlignMask, int txtHeight, int borderHeight ){
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int baseLinePos = ceilf(FT_MulFix( face->bbox.yMax, face->size->metrics.y_scale )/64.0f);
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if (eAlignMask == Image::TextAlign::CENTER || eAlignMask == Image::TextAlign::LEFT || eAlignMask == Image::TextAlign::RIGHT) {
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//vertical center
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return (borderHeight - txtHeight) / 2 + baseLinePos;
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} else if (eAlignMask == Image::TextAlign::BOTTOM_RIGHT || eAlignMask == Image::TextAlign::BOTTOM || eAlignMask == Image::TextAlign::BOTTOM_LEFT) {
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//vertical bottom
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return borderHeight - txtHeight + baseLinePos;
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}
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// top alignment
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return baseLinePos;
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}
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std::string getFontFile(const char* family_name) {
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std::string fontPath = family_name;
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std::map<std::string, std::string>::iterator it = fontCache.find(family_name);
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if ( it != fontCache.end() ) {
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return it->second;
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}
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// check if the parameter is a font file shipped with the application
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std::string lowerCasePath = fontPath;
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std::transform(lowerCasePath.begin(), lowerCasePath.end(), lowerCasePath.begin(), ::tolower);
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if ( lowerCasePath.find(".ttf") != std::string::npos ) {
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fontPath = cocos2d::FileUtils::getInstance()->fullPathForFilename(fontPath.c_str());
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FILE *f = fopen(fontPath.c_str(), "r");
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if ( f ) {
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fclose(f);
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fontCache.insert(std::pair<std::string, std::string>(family_name, fontPath));
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return fontPath;
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}
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}
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// use fontconfig to match the parameter against the fonts installed on the system
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FcPattern *pattern = FcPatternBuild (0, FC_FAMILY, FcTypeString, family_name, (char *) 0);
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FcConfigSubstitute(0, pattern, FcMatchPattern);
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FcDefaultSubstitute(pattern);
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FcResult result;
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FcPattern *font = FcFontMatch(0, pattern, &result);
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if ( font ) {
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FcChar8 *s = NULL;
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if ( FcPatternGetString(font, FC_FILE, 0, &s) == FcResultMatch ) {
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fontPath = (const char*)s;
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FcPatternDestroy(font);
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FcPatternDestroy(pattern);
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fontCache.insert(std::pair<std::string, std::string>(family_name, fontPath));
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return fontPath;
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}
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FcPatternDestroy(font);
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}
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FcPatternDestroy(pattern);
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return family_name;
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}
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bool getBitmap(const char *text, int nWidth, int nHeight, Image::TextAlign eAlignMask, const char * pFontName, float fontSize) {
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if (libError) {
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return false;
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}
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FT_Face face;
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std::string fontfile = getFontFile(pFontName);
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if ( FT_New_Face(library, fontfile.c_str(), 0, &face) ) {
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//no valid font found use default
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if ( FT_New_Face(library, "/usr/share/fonts/truetype/freefont/FreeSerif.ttf", 0, &face) ) {
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return false;
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}
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}
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//select utf8 charmap
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if ( FT_Select_Charmap(face, FT_ENCODING_UNICODE) ) {
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FT_Done_Face(face);
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return false;
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}
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if ( FT_Set_Pixel_Sizes(face, fontSize, fontSize) ) {
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FT_Done_Face(face);
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return false;
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}
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if ( divideString(face, text, nWidth, nHeight) == false ) {
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FT_Done_Face(face);
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return false;
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}
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//compute the final line width
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iMaxLineWidth = MAX(iMaxLineWidth, nWidth);
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//compute the final line height
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iMaxLineHeight = ceilf(FT_MulFix( face->bbox.yMax - face->bbox.yMin, face->size->metrics.y_scale )/64.0f);
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int lineHeight = face->size->metrics.height>>6;
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if ( textLines.size() > 0 ) {
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iMaxLineHeight += (lineHeight * (textLines.size() -1));
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}
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int txtHeight = iMaxLineHeight;
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iMaxLineHeight = MAX(iMaxLineHeight, nHeight);
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_data = new unsigned char[iMaxLineWidth * iMaxLineHeight * 4];
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memset(_data,0, iMaxLineWidth * iMaxLineHeight*4);
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int iCurYCursor = computeLineStartY(face, eAlignMask, txtHeight, iMaxLineHeight);
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int lineCount = textLines.size();
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for (int line = 0; line < lineCount; line++) {
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int iCurXCursor = computeLineStart(face, eAlignMask, line);
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int glyphCount = textLines.at(line).glyphs.size();
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for (int i = 0; i < glyphCount; i++) {
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LineBreakGlyph glyph = textLines.at(line).glyphs.at(i);
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if (FT_Load_Glyph(face, glyph.glyphIndex, FT_LOAD_RENDER)) {
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continue;
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}
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FT_Bitmap& bitmap = face->glyph->bitmap;
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int yoffset = iCurYCursor - (face->glyph->metrics.horiBearingY >> 6);
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int xoffset = iCurXCursor + glyph.paintPosition;
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for (int y = 0; y < bitmap.rows; ++y) {
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int iY = yoffset + y;
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if (iY>=iMaxLineHeight) {
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//exceed the height truncate
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break;
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}
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iY *= iMaxLineWidth;
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int bitmap_y = y * bitmap.width;
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for (int x = 0; x < bitmap.width; ++x) {
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unsigned char cTemp = bitmap.buffer[bitmap_y + x];
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if (cTemp == 0) {
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continue;
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}
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int iX = xoffset + x;
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int iTemp = cTemp << 24 | cTemp << 16 | cTemp << 8 | cTemp;
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*(int*) &_data[(iY + iX) * 4 + 0] = iTemp;
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}
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}
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}
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// step to next line
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iCurYCursor += lineHeight;
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}
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// free face
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FT_Done_Face(face);
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return true;
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}
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public:
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FT_Library library;
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unsigned char *_data;
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int libError;
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std::vector<LineBreakLine> textLines;
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int iMaxLineWidth;
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int iMaxLineHeight;
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};
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static BitmapDC& sharedBitmapDC()
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{
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static BitmapDC s_BmpDC;
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return s_BmpDC;
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}
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bool Image::initWithString(
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const char * pText,
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int nWidth/* = 0*/,
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int nHeight/* = 0*/,
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TextAlign eAlignMask/* = kAlignCenter*/,
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const char * pFontName/* = nil*/,
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int nSize/* = 0*/)
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{
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bool bRet = false;
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do
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{
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CC_BREAK_IF(! pText);
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BitmapDC &dc = sharedBitmapDC();
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//const char* pFullFontName = FileUtils::getInstance()->fullPathFromRelativePath(pFontName);
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CC_BREAK_IF(! dc.getBitmap(pText, nWidth, nHeight, eAlignMask, pFontName, nSize));
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// assign the dc._data to _data in order to save time
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_data = dc._data;
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CC_BREAK_IF(! _data);
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_width = (short)dc.iMaxLineWidth;
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_height = (short)dc.iMaxLineHeight;
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_renderFormat = Texture2D::PixelFormat::RGBA8888;
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_preMulti = true;
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bRet = true;
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dc.reset();
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}while (0);
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//do nothing
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return bRet;
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}
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NS_CC_END
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