/usr/share/doc/libicu-devel/samples/layout
Edit: /usr/share/doc/libicu-devel/samples/layout/GnomeFontInstance.cpp (5557B)
/*
*******************************************************************************
*
* © 2016 and later: Unicode, Inc. and others.
* License & terms of use: http://www.unicode.org/copyright.html#License
*
*******************************************************************************
*******************************************************************************
*
* Copyright (C) 1999-2007, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: GnomeFontInstance.cpp
*
* created on: 08/30/2001
* created by: Eric R. Mader
*/
#include
#include
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include FT_RENDER_H
#include FT_TRUETYPE_TABLES_H
#include
#include
#include "layout/LETypes.h"
#include "layout/LESwaps.h"
#include "GnomeFontInstance.h"
#include "sfnt.h"
#include "cmaps.h"
GnomeSurface::GnomeSurface(GtkWidget *theWidget)
: fWidget(theWidget)
{
fCairo = gdk_cairo_create(fWidget->window);
}
GnomeSurface::~GnomeSurface()
{
cairo_destroy(fCairo);
}
void GnomeSurface::drawGlyphs(const LEFontInstance *font, const LEGlyphID *glyphs, le_int32 count,
const float *positions, le_int32 x, le_int32 y, le_int32 /*width*/, le_int32 /*height*/)
{
GnomeFontInstance *gFont = (GnomeFontInstance *) font;
gFont->rasterizeGlyphs(fCairo, glyphs, count, positions, x, y);
}
GnomeFontInstance::GnomeFontInstance(FT_Library engine, const char *fontPathName, le_int16 pointSize, LEErrorCode &status)
: FontTableCache(), fPointSize(pointSize), fUnitsPerEM(0), fAscent(0), fDescent(0), fLeading(0),
fDeviceScaleX(1), fDeviceScaleY(1), fMapper(NULL)
{
FT_Error error;
fFace = NULL;
fCairoFace = NULL;
error = FT_New_Face(engine, fontPathName, 0, &fFace);
if (error != 0) {
printf("OOPS! Got error code %d\n", error);
status = LE_FONT_FILE_NOT_FOUND_ERROR;
return;
}
// FIXME: what about the display resolution?
fDeviceScaleX = ((float) 96) / 72;
fDeviceScaleY = ((float) 96) / 72;
error = FT_Set_Char_Size(fFace, 0, pointSize << 6, 92, 92);
fCairoFace = cairo_ft_font_face_create_for_ft_face(fFace, 0);
fUnitsPerEM = fFace->units_per_EM;
fAscent = (le_int32) (yUnitsToPoints(fFace->ascender) * fDeviceScaleY);
fDescent = (le_int32) -(yUnitsToPoints(fFace->descender) * fDeviceScaleY);
fLeading = (le_int32) (yUnitsToPoints(fFace->height) * fDeviceScaleY) - fAscent - fDescent;
// printf("Face = %s, unitsPerEM = %d, ascent = %d, descent = %d\n", fontPathName, fUnitsPerEM, fAscent, fDescent);
if (error != 0) {
status = LE_MEMORY_ALLOCATION_ERROR;
return;
}
status = initMapper();
}
GnomeFontInstance::~GnomeFontInstance()
{
cairo_font_face_destroy(fCairoFace);
if (fFace != NULL) {
FT_Done_Face(fFace);
}
}
LEErrorCode GnomeFontInstance::initMapper()
{
LETag cmapTag = LE_CMAP_TABLE_TAG;
const CMAPTable *cmap = (const CMAPTable *) readFontTable(cmapTag);
if (cmap == NULL) {
return LE_MISSING_FONT_TABLE_ERROR;
}
fMapper = CMAPMapper::createUnicodeMapper(cmap);
if (fMapper == NULL) {
return LE_MISSING_FONT_TABLE_ERROR;
}
return LE_NO_ERROR;
}
const void *GnomeFontInstance::getFontTable(LETag tableTag) const
{
return FontTableCache::find(tableTag);
}
const void *GnomeFontInstance::readFontTable(LETag tableTag) const
{
FT_ULong len = 0;
FT_Byte *result = NULL;
FT_Load_Sfnt_Table(fFace, tableTag, 0, NULL, &len);
if (len > 0) {
result = LE_NEW_ARRAY(FT_Byte, len);
FT_Load_Sfnt_Table(fFace, tableTag, 0, result, &len);
}
return result;
}
void GnomeFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
{
advance.fX = 0;
advance.fY = 0;
if (glyph >= 0xFFFE) {
return;
}
FT_Error error;
error = FT_Load_Glyph(fFace, glyph, FT_LOAD_DEFAULT);
if (error != 0) {
return;
}
advance.fX = fFace->glyph->metrics.horiAdvance >> 6;
return;
}
le_bool GnomeFontInstance::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const
{
FT_Error error;
error = FT_Load_Glyph(fFace, glyph, FT_LOAD_DEFAULT);
if (error != 0) {
return FALSE;
}
if (pointNumber >= fFace->glyph->outline.n_points) {
return FALSE;
}
point.fX = fFace->glyph->outline.points[pointNumber].x >> 6;
point.fY = fFace->glyph->outline.points[pointNumber].y >> 6;
return TRUE;
}
void GnomeFontInstance::rasterizeGlyphs(cairo_t *cairo, const LEGlyphID *glyphs, le_int32 glyphCount, const float *positions,
le_int32 x, le_int32 y) const
{
cairo_glyph_t *glyph_t = LE_NEW_ARRAY(cairo_glyph_t, glyphCount);
le_int32 in, out;
for (in = 0, out = 0; in < glyphCount; in += 1) {
TTGlyphID glyph = LE_GET_GLYPH(glyphs[in]);
if (glyph < 0xFFFE) {
glyph_t[out].index = glyph;
glyph_t[out].x = x + positions[in*2];
glyph_t[out].y = y + positions[in*2 + 1];
out += 1;
}
}
cairo_set_font_face(cairo, fCairoFace);
cairo_set_font_size(cairo, getXPixelsPerEm() * getScaleFactorX());
cairo_show_glyphs(cairo, glyph_t, out);
LE_DELETE_ARRAY(glyph_t);
}