1 /*
2 * FTGL - OpenGL font library
3 *
4 * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
5 * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net>
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining
8 * a copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sublicense, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be
16 * included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
22 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27 #include "config.h"
28
29 #include "FTGL/ftgl.h"
30
31 #include "FTInternals.h"
32 #include "FTPixmapFontImpl.h"
33 #include "FTGL/FTLibrary.h"
34
35
36 //
37 // FTPixmapFont
38 //
39
40
FTPixmapFont(char const * fontFilePath)41 FTPixmapFont::FTPixmapFont(char const *fontFilePath) :
42 FTFont(new FTPixmapFontImpl(this, fontFilePath))
43 {}
44
45
FTPixmapFont(const unsigned char * pBufferBytes,size_t bufferSizeInBytes)46 FTPixmapFont::FTPixmapFont(const unsigned char *pBufferBytes,
47 size_t bufferSizeInBytes) :
48 FTFont(new FTPixmapFontImpl(this, pBufferBytes, bufferSizeInBytes))
49 {}
50
51
~FTPixmapFont()52 FTPixmapFont::~FTPixmapFont()
53 {}
54
55
MakeGlyph(FT_GlyphSlot ftGlyph)56 FTGlyph* FTPixmapFont::MakeGlyph(FT_GlyphSlot ftGlyph)
57 {
58 return new FTPixmapGlyph(ftGlyph);
59 }
60
61
62 //
63 // FTPixmapFontImpl
64 //
65
66
FTPixmapFontImpl(FTFont * ftFont,const char * fontFilePath)67 FTPixmapFontImpl::FTPixmapFontImpl(FTFont *ftFont, const char* fontFilePath)
68 : FTFontImpl(ftFont, fontFilePath)
69 {
70 load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
71 }
72
73
FTPixmapFontImpl(FTFont * ftFont,const unsigned char * pBufferBytes,size_t bufferSizeInBytes)74 FTPixmapFontImpl::FTPixmapFontImpl(FTFont *ftFont,
75 const unsigned char *pBufferBytes,
76 size_t bufferSizeInBytes)
77 : FTFontImpl(ftFont, pBufferBytes, bufferSizeInBytes)
78 {
79 load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
80 }
81
82
83 template <typename T>
RenderI(const T * string,const int len,FTPoint position,FTPoint spacing,int renderMode)84 inline FTPoint FTPixmapFontImpl::RenderI(const T* string, const int len,
85 FTPoint position, FTPoint spacing,
86 int renderMode)
87 {
88 // Protect GL_TEXTURE_2D, glPixelTransferf() and optionally GL_BLEND
89 glPushAttrib(GL_ENABLE_BIT | GL_PIXEL_MODE_BIT | GL_COLOR_BUFFER_BIT
90 | GL_POLYGON_BIT);
91
92 // Protect glPixelStorei() calls (made by FTPixmapGlyphImpl::RenderImpl).
93 glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
94
95 // Needed on OSX
96 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
97
98 if(FTLibrary::Instance().GetLegacyOpenGLStateSet())
99 {
100 glEnable(GL_BLEND);
101 /*
102 * Note: This is the historic legacy behaviour.
103 *
104 * A better blending function (see
105 * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742469) is:
106 *
107 * glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
108 * GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
109 *
110 * To use it, set
111 *
112 * FTLibrary::Instance().LegacyOpenGLState(false);
113 *
114 * and set GL_BLEND and the blending function yourself.
115 */
116 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
117 }
118
119 glDisable(GL_TEXTURE_2D);
120
121 GLfloat ftglColour[4];
122 glGetFloatv(GL_CURRENT_RASTER_COLOR, ftglColour);
123
124 glPixelTransferf(GL_RED_SCALE, ftglColour[0]);
125 glPixelTransferf(GL_GREEN_SCALE, ftglColour[1]);
126 glPixelTransferf(GL_BLUE_SCALE, ftglColour[2]);
127 glPixelTransferf(GL_ALPHA_SCALE, ftglColour[3]);
128
129 FTPoint tmp = FTFontImpl::Render(string, len,
130 position, spacing, renderMode);
131
132 glPopClientAttrib();
133 glPopAttrib();
134
135 return tmp;
136 }
137
138
Render(const char * string,const int len,FTPoint position,FTPoint spacing,int renderMode)139 FTPoint FTPixmapFontImpl::Render(const char * string, const int len,
140 FTPoint position, FTPoint spacing,
141 int renderMode)
142 {
143 return RenderI(string, len, position, spacing, renderMode);
144 }
145
146
Render(const wchar_t * string,const int len,FTPoint position,FTPoint spacing,int renderMode)147 FTPoint FTPixmapFontImpl::Render(const wchar_t * string, const int len,
148 FTPoint position, FTPoint spacing,
149 int renderMode)
150 {
151 return RenderI(string, len, position, spacing, renderMode);
152 }
153
154