name : GnomeFontInstance.cpp /* ******************************************************************************* * * © 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 <gnome.h> #include <ft2build.h> #include FT_FREETYPE_H #include FT_GLYPH_H #include FT_RENDER_H #include FT_TRUETYPE_TABLES_H #include <cairo.h> #include <cairo-ft.h> #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); }