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0023457: Slow text rendering
Added class Font_FTFont wrapper over FreeType face Unify collections methods NCollection_Array1, NCollection_Sequence, NCollection_Vector: declare Upper, Lower, First, Last, ChangeFirst, ChangeLast methods for all these collections. Added method NCollection_DataMap::Find() with check key is bound + retrieve value within single call interface. OpenGl_Context::ReleaseResource() method now supports lazy release of shared resources. Added class OpenGl_Font which implements textured fonts support. Added class OpenGl_TextFormatter for text formatting using OpenGl_Font. OpenGl_Text was redesigned to use OpenGl_FontFormatter. OpenGl_FontMgr class was removed. All methods related to text rendered removed from OpenGl_Display class. OpenGl_Trihedron and OpenGl_GraduatedTrihedron classes were redesigned to use OpenGl_Text. OpenGl_PrinterContext instance was moved to OpenGl_GraphicDriver fields (eliminated usage of global instance). Added test cases into 3rdparty/fonts grid to check different font styles and perform FPS tests (no automated results - requires manual analysis or snapshots comparisons). Removed unused CSF_FTGL dependency. OpenGl_Text::setupMatrix - do not apply floor for myWinZ
This commit is contained in:
kgv
243
src/Font/Font_FTFont.cxx
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243
src/Font/Font_FTFont.cxx
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// Created on: 2013-01-28
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// Created by: Kirill GAVRILOV
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// Copyright (c) 2013 OPEN CASCADE SAS
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//
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// The content of this file is subject to the Open CASCADE Technology Public
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// License Version 6.5 (the "License"). You may not use the content of this file
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// except in compliance with the License. Please obtain a copy of the License
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// at http://www.opencascade.org and read it completely before using this file.
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//
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// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
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// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
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//
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// The Original Code and all software distributed under the License is
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// distributed on an "AS IS" basis, without warranty of any kind, and the
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// Initial Developer hereby disclaims all such warranties, including without
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// limitation, any warranties of merchantability, fitness for a particular
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// purpose or non-infringement. Please see the License for the specific terms
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// and conditions governing the rights and limitations under the License.
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#include <Font_FTFont.hxx>
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IMPLEMENT_STANDARD_HANDLE (Font_FTFont, Standard_Transient)
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IMPLEMENT_STANDARD_RTTIEXT(Font_FTFont, Standard_Transient)
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// =======================================================================
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// function : Font_FTFont
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// purpose :
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// =======================================================================
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Font_FTFont::Font_FTFont (const Handle(Font_FTLibrary)& theFTLib)
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: myFTLib (theFTLib),
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myFTFace (NULL),
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myPointSize (0),
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myUChar (0)
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{
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if (myFTLib.IsNull())
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{
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myFTLib = new Font_FTLibrary();
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}
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}
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// =======================================================================
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// function : Font_FTFont
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// purpose :
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// =======================================================================
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Font_FTFont::~Font_FTFont()
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{
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Release();
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}
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// =======================================================================
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// function : Font_FTFont
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// purpose :
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// =======================================================================
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void Font_FTFont::Release()
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{
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myGlyphImg.Clear();
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myFontPath.Clear();
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myUChar = 0;
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if (myFTFace != NULL)
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{
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FT_Done_Face (myFTFace);
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myFTFace = NULL;
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}
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}
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// =======================================================================
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// function : Font_FTFont
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// purpose :
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// =======================================================================
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bool Font_FTFont::Init (const NCollection_String& theFontPath,
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const unsigned int thePointSize,
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const unsigned int theResolution)
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{
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Release();
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myFontPath = theFontPath;
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myPointSize = thePointSize;
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if (!myFTLib->IsValid())
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{
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std::cerr << "FreeType library is unavailable!\n";
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Release();
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return false;
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}
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if (FT_New_Face (myFTLib->Instance(), myFontPath.ToCString(), 0, &myFTFace) != 0)
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{
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//std::cerr << "Font '" << myFontPath << "' fail to load!\n";
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Release();
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return false;
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}
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else if (FT_Select_Charmap (myFTFace, ft_encoding_unicode) != 0)
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{
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//std::cerr << "Font '" << myFontPath << "' doesn't contains Unicode charmap!\n";
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Release();
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return false;
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}
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else if (FT_Set_Char_Size (myFTFace, 0L, toFTPoints (thePointSize), theResolution, theResolution) != 0)
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{
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//std::cerr << "Font '" << myFontPath << "' doesn't contains Unicode charmap!\n";
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Release();
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return false;
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}
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return true;
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}
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// =======================================================================
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// function : loadGlyph
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// purpose :
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// =======================================================================
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bool Font_FTFont::loadGlyph (const Standard_Utf32Char theUChar)
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{
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if (myUChar == theUChar)
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{
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return true;
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}
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myGlyphImg.Clear();
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myUChar = 0;
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if (theUChar == 0
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|| FT_Load_Char (myFTFace, theUChar, FT_LOAD_TARGET_NORMAL) != 0
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|| myFTFace->glyph == NULL)
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{
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return false;
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}
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myUChar = theUChar;
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return true;
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}
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// =======================================================================
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// function : RenderGlyph
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// purpose :
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// =======================================================================
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bool Font_FTFont::RenderGlyph (const Standard_Utf32Char theUChar)
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{
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myGlyphImg.Clear();
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myUChar = 0;
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if (theUChar == 0
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|| FT_Load_Char (myFTFace, theUChar, FT_LOAD_RENDER | FT_LOAD_NO_HINTING | FT_LOAD_TARGET_NORMAL) != 0
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|| myFTFace->glyph == NULL
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|| myFTFace->glyph->format != FT_GLYPH_FORMAT_BITMAP)
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{
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return false;
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}
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FT_Bitmap aBitmap = myFTFace->glyph->bitmap;
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if (aBitmap.pixel_mode != FT_PIXEL_MODE_GRAY
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|| aBitmap.buffer == NULL || aBitmap.width <= 0 || aBitmap.rows <= 0)
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{
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return false;
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}
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if (!myGlyphImg.InitWrapper (Image_PixMap::ImgGray, aBitmap.buffer,
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aBitmap.width, aBitmap.rows, Abs (aBitmap.pitch)))
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{
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return false;
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}
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myGlyphImg.SetTopDown (aBitmap.pitch > 0);
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myUChar = theUChar;
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return true;
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}
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// =======================================================================
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// function : GlyphMaxSizeX
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// purpose :
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// =======================================================================
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unsigned int Font_FTFont::GlyphMaxSizeX() const
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{
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float aWidth = (FT_IS_SCALABLE(myFTFace) != 0)
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? float(myFTFace->bbox.xMax - myFTFace->bbox.xMin) * (float(myFTFace->size->metrics.x_ppem) / float(myFTFace->units_per_EM))
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: fromFTPoints<float> (myFTFace->size->metrics.max_advance);
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return (unsigned int)(aWidth + 0.5f);
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}
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// =======================================================================
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// function : GlyphMaxSizeY
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// purpose :
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// =======================================================================
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unsigned int Font_FTFont::GlyphMaxSizeY() const
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{
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float aHeight = (FT_IS_SCALABLE(myFTFace) != 0)
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? float(myFTFace->bbox.yMax - myFTFace->bbox.yMin) * (float(myFTFace->size->metrics.y_ppem) / float(myFTFace->units_per_EM))
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: fromFTPoints<float> (myFTFace->size->metrics.height);
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return (unsigned int)(aHeight + 0.5f);
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}
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// =======================================================================
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// function : AdvanceX
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// purpose :
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// =======================================================================
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float Font_FTFont::AdvanceX (const Standard_Utf32Char theUChar,
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const Standard_Utf32Char theUCharNext)
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{
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loadGlyph (theUChar);
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return AdvanceX (theUCharNext);
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}
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// =======================================================================
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// function : AdvanceY
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// purpose :
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// =======================================================================
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float Font_FTFont::AdvanceY (const Standard_Utf32Char theUChar,
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const Standard_Utf32Char theUCharNext)
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{
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loadGlyph (theUChar);
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return AdvanceY (theUCharNext);
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}
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// =======================================================================
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// function : AdvanceX
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// purpose :
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// =======================================================================
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float Font_FTFont::AdvanceX (const Standard_Utf32Char theUCharNext)
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{
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if (myUChar == 0)
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{
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return 0.0f;
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}
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if (FT_HAS_KERNING (myFTFace) == 0 || theUCharNext == 0
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|| FT_Get_Kerning (myFTFace, myUChar, theUCharNext, FT_KERNING_UNFITTED, &myKernAdvance) != 0)
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{
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return fromFTPoints<float> (myFTFace->glyph->advance.x);
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}
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return fromFTPoints<float> (myKernAdvance.x + myFTFace->glyph->advance.x);
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}
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// =======================================================================
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// function : AdvanceY
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// purpose :
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// =======================================================================
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float Font_FTFont::AdvanceY (const Standard_Utf32Char theUCharNext)
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{
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if (myUChar == 0)
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{
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return 0.0f;
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}
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if (FT_HAS_KERNING (myFTFace) == 0 || theUCharNext == 0
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|| FT_Get_Kerning (myFTFace, myUChar, theUCharNext, FT_KERNING_UNFITTED, &myKernAdvance) != 0)
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{
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return fromFTPoints<float> (myFTFace->glyph->advance.y);
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}
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return fromFTPoints<float> (myKernAdvance.y + myFTFace->glyph->advance.y);
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}
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