The power of truetype font rendering!
authorDavid Gow <david@ingeniumdigital.com>
Thu, 7 Aug 2014 13:34:33 +0000 (21:34 +0800)
committerDavid Gow <david@ingeniumdigital.com>
Thu, 7 Aug 2014 13:34:33 +0000 (21:34 +0800)
src/document.cpp
src/document.h
src/main.cpp

index 71f3ed4..d4d8eac 100644 (file)
@@ -3,6 +3,8 @@
 #include <cstdio>
 #include <fstream>
 
 #include <cstdio>
 #include <fstream>
 
+#include "stb_truetype.h"
+
 using namespace IPDF;
 using namespace std;
 
 using namespace IPDF;
 using namespace std;
 
@@ -508,3 +510,57 @@ void Document::AddPathFromString(const string & d, const Rect & bounds)
                prev_i = i;
        }
 }
                prev_i = i;
        }
 }
+
+void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
+{
+       int glyph_index = stbtt_FindGlyphIndex(font, character);
+
+       // Check if there is actully a glyph to render.
+       if (stbtt_IsGlyphEmpty(font, glyph_index))
+       {
+               return;
+       }
+
+       stbtt_vertex *instructions;
+       int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
+
+       Real current_x(0), current_y(0);
+
+       for (int i = 0; i < num_instructions; ++i)
+       {
+               // TTF uses 16-bit signed ints for coordinates:
+               // with the y-axis inverted compared to us.
+               // Convert and scale any data.
+               Real inst_x = Real(instructions[i].x)*scale;
+               Real inst_y = Real(instructions[i].y)*-scale;
+               Real inst_cx = Real(instructions[i].cx)*scale;
+               Real inst_cy = Real(instructions[i].cy)*-scale;
+               Real old_x(current_x), old_y(current_y);
+               current_x = inst_x;
+               current_y = inst_y;
+               unsigned bezier_index;
+               switch(instructions[i].type)
+               {
+               // Move To
+               case STBTT_vmove:
+                       break;
+               // Line To
+               case STBTT_vline:
+                       bezier_index = AddBezierData(Bezier(old_x + x, old_y + y, old_x + x, old_y + y, current_x + x, current_y + y, current_x + x, current_y + y));
+                       Add(BEZIER,Rect(0,0,1,1),bezier_index);
+                       break;
+               // Quadratic Bezier To:
+               case STBTT_vcurve:
+                       // Quadratic -> Cubic:
+                       // - Endpoints are the same.
+                       // - cubic1 = quad0+(2/3)*(quad1-quad0)
+                       // - cubic2 = quad2+(2/3)*(quad1-quad2)
+                       bezier_index = AddBezierData(Bezier(old_x + x, old_y + y, old_x + Real(2)*(inst_cx-old_x)/Real(3) + x, old_y + Real(2)*(inst_cy-old_y)/Real(3) + y,
+                                               current_x + Real(2)*(inst_cx-current_x)/Real(3) + x, current_y + Real(2)*(inst_cy-current_y)/Real(3) + y, current_x + x, current_y + y));
+                       Add(BEZIER,Rect(0,0,1,1),bezier_index);
+                       break;
+               }
+       }
+
+       stbtt_FreeShape(font, instructions);
+}
index 14a87d8..c1f026b 100644 (file)
@@ -4,6 +4,8 @@
 #include "ipdf.h"
 #include "quadtree.h"
 
 #include "ipdf.h"
 #include "quadtree.h"
 
+typedef struct stbtt_fontinfo stbtt_fontinfo;
+
 namespace IPDF
 {
        class Document
 namespace IPDF
 {
        class Document
@@ -29,6 +31,8 @@ namespace IPDF
                        
                        void AddPathFromString(const std::string & d, const Rect & bounds);
 
                        
                        void AddPathFromString(const std::string & d, const Rect & bounds);
 
+                       void AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y);
+
 #ifndef QUADTREE_DISABLED
                        inline const QuadTree& GetQuadTree() { if (m_quadtree.root_id == QUADTREE_EMPTY) { GenBaseQuadtree(); } return m_quadtree; }
                        QuadTreeIndex GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type);
 #ifndef QUADTREE_DISABLED
                        inline const QuadTree& GetQuadTree() { if (m_quadtree.root_id == QUADTREE_EMPTY) { GenBaseQuadtree(); } return m_quadtree; }
                        QuadTreeIndex GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type);
index d7df87a..d5d4da8 100644 (file)
@@ -1,5 +1,6 @@
 #include "main.h"
 #include <unistd.h> // Because we can.
 #include "main.h"
 #include <unistd.h> // Because we can.
+#include "stb_truetype.h"
 int main(int argc, char ** argv)
 {      
        #ifndef __STDC_IEC_559__
 int main(int argc, char ** argv)
 {      
        #ifndef __STDC_IEC_559__
@@ -81,11 +82,28 @@ int main(int argc, char ** argv)
        }
        else 
        {
        }
        else 
        {
-               doc.AddBezierData(Bezier(0,0,0,1,1,0));
+/*             doc.AddBezierData(Bezier(0,0,0,1,1,0));
                doc.AddBezierData(Bezier(0,0,1,0,0,1));
                doc.AddBezierData(Bezier(0,0,1,1,1,0));
                doc.AddBezierData(Bezier(0,0,1,0,0,1));
                doc.AddBezierData(Bezier(0,0,1,1,1,0));
-               doc.AddBezierData(Bezier(0,1,1,0,0,1));
+               doc.AddBezierData(Bezier(0,1,1,0,0,1));*/
                
                
+               stbtt_fontinfo font;
+               FILE *font_file = fopen("DejaVuSansMono.ttf", "rb");
+               fseek(font_file, 0, SEEK_END);
+               size_t font_file_size = ftell(font_file);
+               fseek(font_file, 0, SEEK_SET);
+               unsigned char *font_file_data = (unsigned char*)malloc(font_file_size);
+               SDL_assert(fread(font_file_data, 1, font_file_size, font_file) == font_file_size);
+               fclose(font_file);
+               stbtt_InitFont(&font, font_file_data, 0);
+
+               float font_scale = stbtt_ScaleForPixelHeight(&font, 1);
+               doc.AddFontGlyphAtPoint(&font,'a', Real(font_scale), Real(0), Real(1));  
+               doc.AddFontGlyphAtPoint(&font,'b', Real(font_scale), Real(0.5), Real(1));  
+               doc.AddFontGlyphAtPoint(&font,'c', Real(font_scale), Real(1), Real(1));  
+               doc.AddFontGlyphAtPoint(&font,'d', Real(font_scale), Real(1.5), Real(1));  
+
+               free(font_file_data);
                
                
                for(int x = 0; x < 8; ++x)
                
                
                for(int x = 0; x < 8; ++x)
@@ -97,10 +115,10 @@ int main(int argc, char ** argv)
                                //doc.Add(BEZIER, Rect(0.2+x-4.0, 0.2+y-4.0, 0.6,0.6), (x^y)%3);
                        }
                }
                                //doc.Add(BEZIER, Rect(0.2+x-4.0, 0.2+y-4.0, 0.6,0.6), (x^y)%3);
                        }
                }
-               doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 0);
+       /*      doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 0);
                doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 1);
                doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 2);
                doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 1);
                doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 2);
-               doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 3);
+               doc.Add(BEZIER, Rect(0.1,0.1,0.8,0.8), 3);*/
                //doc.Add(CIRCLE_FILLED, Rect(0.1,0.1,0.8,0.8), 0);
        }
        Debug("Start!");
                //doc.Add(CIRCLE_FILLED, Rect(0.1,0.1,0.8,0.8), 0);
        }
        Debug("Start!");

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