qfontengine_ft.cpp File Reference

#include "qdir.h"
#include "qmetatype.h"
#include "qtextstream.h"
#include "qvariant.h"
#include "qfontengine_ft_p.h"
#include "qfile.h"
#include "qabstractfileengine.h"
#include "qthreadstorage.h"
#include <qmath.h>
#include <private/qharfbuzz_p.h>
#include <ft2build.h>
#include <FT_FREETYPE_H>
#include <FT_OUTLINE_H>
#include <FT_SYNTHESIS_H>
#include <FT_TRUETYPE_TABLES_H>
#include <FT_TYPE1_TABLES_H>
#include <FT_GLYPH_H>

Go to the source code of this file.

Classes
class	QtFreetypeData

Macros
#define	CEIL(x)   (((x)+63) & -64)
#define	FLOOR(x)   ((x) & -64)
#define	Q_FT_GLYPHSLOT_EMBOLDEN(slot)
#define	QT_MAX_CACHED_GLYPH_SIZE   64
#define	ROUND(x)   (((x)+32) & -64)
#define	TRUNC(x)   ((x) >> 6)
#define	X_SIZE(face, i)   ((face)->available_sizes[i].width << 6)
#define	Y_SIZE(face, i)   ((face)->available_sizes[i].height << 6)

Functions
static void	convertRGBToARGB (const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
static void	convertRGBToARGB_V (const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
static void	convoluteBitmap (const uchar *src, uchar *dst, int width, int height, int pitch)
static uint	filterPixel (uint red, uint green, uint blue, bool legacyFilter)
static unsigned int	getChar (const QChar *str, int &i, const int len)
static HB_Error	hb_getSFntTable (void *font, HB_Tag tableTag, HB_Byte *buffer, HB_UInt *length)
void	qt_addBitmapToPath (qreal x0, qreal y0, const uchar *image_data, int bpl, int w, int h, QPainterPath *path)
FT_Library	qt_getFreetype ()
QtFreetypeData *	qt_getFreetypeData ()
static void	scaleOutline (FT_Face face, FT_GlyphSlot g, FT_Fixed x_scale, FT_Fixed y_scale)

Variables
static const ushort	char_table []
static const int	char_table_entries = sizeof(char_table)/sizeof(ushort)
static const uint	subpixel_filter [3][3]

Macro Definition Documentation

CEIL

#define CEIL

(

x

)

(((x)+63) & -64)

Definition at line 108 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::alphaMapBoundingBox(), QFontEngineFT::boundingBox(), and QFontEngineFT::loadGlyph().

FLOOR

#define FLOOR

(

x

)

((x) & -64)

Definition at line 107 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::alphaMapBoundingBox(), QFontEngineFT::boundingBox(), and QFontEngineFT::loadGlyph().

Q_FT_GLYPHSLOT_EMBOLDEN

#define Q_FT_GLYPHSLOT_EMBOLDEN

(

slot

)

Definition at line 104 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::loadGlyph().

QT_MAX_CACHED_GLYPH_SIZE

#define QT_MAX_CACHED_GLYPH_SIZE   64

Definition at line 82 of file qfontengine_ft.cpp.

Referenced by QFreetypeFace::computeSize(), and QFontEngineFT::loadTransformedGlyphSet().

ROUND

#define ROUND

(

x

)

(((x)+32) & -64)

Definition at line 110 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::alphaMapBoundingBox(), QFontEngineFT::boundingBox(), and QFontEngineFT::loadGlyph().

TRUNC

#define TRUNC

(

x

)

((x) >> 6)

Definition at line 109 of file qfontengine_ft.cpp.

Referenced by QFreetypeFace::addBitmapToPath(), QFontEngineFT::alphaMapBoundingBox(), QFontEngineFT::boundingBox(), and QFontEngineFT::loadGlyph().

X_SIZE

#define X_SIZE	(		face,
			i
	)		((face)->available_sizes[i].width << 6)

Definition at line 96 of file qfontengine_ft.cpp.

Referenced by QFreetypeFace::computeSize(), QFreetypeFace::getFace(), and QFontEngineFT::init().

Y_SIZE

#define Y_SIZE	(		face,
			i
	)		((face)->available_sizes[i].height << 6)

Definition at line 97 of file qfontengine_ft.cpp.

Referenced by QFreetypeFace::computeSize(), QFreetypeFace::getFace(), and QFontEngineFT::init().

Function Documentation

convertRGBToARGB()

static void convertRGBToARGB ( const uchar *  src, uint *  dst, int  width, int  height, int  src_pitch, bool  bgr, bool  legacyFilter  )

static

Definition at line 569 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::loadGlyph().

{
    int h = height;
    const int offs = bgr ? -1 : 1;
    const int w = width * 3;
    while (h--) {
        uint *dd = dst;
        for (int x = 0; x < w; x += 3) {
            uint red = src[x+1-offs];
            uint green = src[x+1];
            uint blue = src[x+1+offs];
            *dd = filterPixel(red, green, blue, legacyFilter);
            ++dd;
        }
        dst += width;
        src += src_pitch;
    }
}

convertRGBToARGB_V()

static void convertRGBToARGB_V ( const uchar *  src, uint *  dst, int  width, int  height, int  src_pitch, bool  bgr, bool  legacyFilter  )

static

Definition at line 588 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::loadGlyph().

{
    int h = height;
    const int offs = bgr ? -src_pitch : src_pitch;
    while (h--) {
        for (int x = 0; x < width; x++) {
            uint red = src[x+src_pitch-offs];
            uint green = src[x+src_pitch];
            uint blue = src[x+src_pitch+offs];
            dst[x] = filterPixel(red, green, blue, legacyFilter);
        }
        dst += width;
        src += 3*src_pitch;
    }
}

convoluteBitmap()

static void convoluteBitmap ( const uchar *  src, uchar *  dst, int  width, int  height, int  pitch  )

static

Definition at line 604 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::loadGlyph().

{
    // convolute the bitmap with a triangle filter to get rid of color fringes
    // If we take account for a gamma value of 2, we end up with
    // weights of 1, 4, 9, 4, 1. We use an approximation of 1, 3, 8, 3, 1 here,
    // as this nicely sums up to 16 :)
    int h = height;
    while (h--) {
        dst[0] = dst[1] = 0;
        //
        for (int x = 2; x < width - 2; ++x) {
            uint sum = src[x-2] + 3*src[x-1] + 8*src[x] + 3*src[x+1] + src[x+2];
            dst[x] = (uchar) (sum >> 4);
        }
        dst[width - 2] = dst[width - 1] = 0;
        src += pitch;
        dst += pitch;
    }
}

filterPixel()

static uint filterPixel ( uint  red, uint  green, uint  blue, bool  legacyFilter  )

inlinestatic

Definition at line 554 of file qfontengine_ft.cpp.

Referenced by convertRGBToARGB(), and convertRGBToARGB_V().

{
    uint res;
    if (legacyFilter) {
        uint high = (red*subpixel_filter[0][0] + green*subpixel_filter[0][1] + blue*subpixel_filter[0][2]) >> 8;
        uint mid = (red*subpixel_filter[1][0] + green*subpixel_filter[1][1] + blue*subpixel_filter[1][2]) >> 8;
        uint low = (red*subpixel_filter[2][0] + green*subpixel_filter[2][1] + blue*subpixel_filter[2][2]) >> 8;
        res = (mid << 24) + (high << 16) + (mid << 8) + low;
    } else {
        uint alpha = green;
        res = (alpha << 24) + (red << 16) + (green << 8) + blue;
    }
    return res;
}

getChar()

static unsigned int getChar ( const QChar *  str, int &  i, const int  len  )

inlinestatic

Definition at line 1423 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::canRender(), QTextStreamPrivate::getNumber(), QTextStreamPrivate::getReal(), QXmlStreamReaderPrivate::parse(), QFontEngineFT::stringToCMap(), and QIODevice::write().

{
    uint ucs4 = str[i].unicode();
    if (str[i].isHighSurrogate() && i < len-1 && str[i+1].isLowSurrogate()) {
        ++i;
        ucs4 = QChar::surrogateToUcs4(ucs4, str[i].unicode());
    }
    return ucs4;
}

hb_getSFntTable()

static HB_Error hb_getSFntTable ( void *  font, HB_Tag  tableTag, HB_Byte *  buffer, HB_UInt *  length  )

static

Definition at line 112 of file qfontengine_ft.cpp.

Referenced by QFreetypeFace::getFace().

{
#if (FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100 + FREETYPE_PATCH) > 20103
    FT_Face face = (FT_Face)font;
    FT_ULong ftlen = *length;
    FT_Error error = 0;

    if ( !FT_IS_SFNT(face) )
        return HB_Err_Invalid_Argument;

    error = FT_Load_Sfnt_Table(face, tableTag, 0, buffer, &ftlen);
    *length = ftlen;
    return (HB_Error)error;
#else
    return HB_Err_Invalid_Argument;
#endif
}

qt_addBitmapToPath()

void qt_addBitmapToPath	(	qreal	x0,
		qreal	y0,
		const uchar *	image_data,
		int	bpl,
		int	w,
		int	h,
		QPainterPath *	path
	)

Definition at line 487 of file qfontengine.cpp.

Referenced by QFontEngine::addBitmapFontToPath(), QFreetypeFace::addBitmapToPath(), QFreetypeFace::addGlyphToPath(), and QFontEngineXLFD::addOutlineToPath().

{
    uint *grid = new uint[(w+1)*(h+1)];
    // set up edges
    for (int y = 0; y <= h; ++y) {
        for (int x = 0; x <= w; ++x) {
            bool topLeft = (x == 0)|(y == 0) ? false : SET(x - 1, y - 1);
            bool topRight = (x == w)|(y == 0) ? false : SET(x, y - 1);
            bool bottomLeft = (x == 0)|(y == h) ? false : SET(x - 1, y);
            bool bottomRight = (x == w)|(y == h) ? false : SET(x, y);

            GRID(x, y) = 0;
            if ((!topRight) & bottomRight)
                GRID(x, y) |= EdgeRight;
            if ((!bottomRight) & bottomLeft)
                GRID(x, y) |= EdgeDown;
            if ((!bottomLeft) & topLeft)
                GRID(x, y) |= EdgeLeft;
            if ((!topLeft) & topRight)
                GRID(x, y) |= EdgeUp;
        }
    }

    // collect edges
    for (int y = 0; y < h; ++y) {
        for (int x = 0; x < w; ++x) {
            if (!GRID(x, y))
                continue;
            // found start of a contour, follow it
            collectSingleContour(x0, y0, grid, x, y, w, h, path);
        }
    }
    delete [] grid;
}

qt_getFreetype()

FT_Library qt_getFreetype

(

)

Definition at line 162 of file qfontengine_ft.cpp.

Referenced by QBasicUnixFontDatabase::addTTFile(), QFontDatabasePrivate::addTTFile(), QFontEngineFT::loadGlyph(), and queryFont().

{
    QtFreetypeData *freetypeData = qt_getFreetypeData();
    if (!freetypeData->library)
        FT_Init_FreeType(&freetypeData->library);
    return freetypeData->library;
}

qt_getFreetypeData()

QtFreetypeData* qt_getFreetypeData

(

)

Definition at line 153 of file qfontengine_ft.cpp.

Referenced by QFreetypeFace::getFace(), qt_getFreetype(), and QFreetypeFace::release().

{
    QtFreetypeData *&freetypeData = theFreetypeData()->localData();
    if (!freetypeData)
        freetypeData = new QtFreetypeData;
    return freetypeData;
}

scaleOutline()

static void scaleOutline ( FT_Face  face, FT_GlyphSlot  g, FT_Fixed  x_scale, FT_Fixed  y_scale  )

static

Definition at line 436 of file qfontengine_ft.cpp.

Referenced by QFreetypeFace::addGlyphToPath().

{
    x_scale = FT_MulDiv(x_scale, 1 << 10, face->units_per_EM);
    y_scale = FT_MulDiv(y_scale, 1 << 10, face->units_per_EM);
    FT_Vector *p = g->outline.points;
    const FT_Vector *e = p + g->outline.n_points;
    while (p < e) {
        p->x = FT_MulFix(p->x, x_scale);
        p->y = FT_MulFix(p->y, y_scale);
        ++p;
    }
}

Variable Documentation

char_table

const ushort char_table[]

static

Initial value:

= {
        40,
        67,
        70,
        75,
        86,
        88,
        89,
        91,
        102,
        114,
        124,
        127,
        205,
        645,
        884,
        922,
        1070,
        12386
}

Definition at line 1215 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::minRightBearing().

char_table_entries

const int char_table_entries = sizeof(char_table)/sizeof(ushort)

static

Definition at line 1236 of file qfontengine_ft.cpp.

Referenced by QFontEngineFT::minRightBearing().

subpixel_filter

const uint subpixel_filter[3][3]

static

Initial value:

= {
    { 180, 60, 16 },
    { 38, 180, 38 },
    { 16, 60, 180 }
}

Definition at line 548 of file qfontengine_ft.cpp.

Referenced by filterPixel().