From: David Gow <david@ingeniumdigital.com>
Date: Thu, 7 Aug 2014 13:34:33 +0000 (+0800)
Subject: The power of truetype font rendering!
X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=commitdiff_plain;h=7e00a47f18e0ccdb0c7255f30bc7820cabb3206a;ds=sidebyside

The power of truetype font rendering!
---

diff --git a/src/document.cpp b/src/document.cpp
index 71f3ed4..d4d8eac 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -3,6 +3,8 @@
 #include <cstdio>
 #include <fstream>
 
+#include "stb_truetype.h"
+
 using namespace IPDF;
 using namespace std;
 
@@ -508,3 +510,57 @@ void Document::AddPathFromString(const string & d, const Rect & bounds)
 		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);
+}
diff --git a/src/document.h b/src/document.h
index 14a87d8..c1f026b 100644
--- a/src/document.h
+++ b/src/document.h
@@ -4,6 +4,8 @@
 #include "ipdf.h"
 #include "quadtree.h"
 
+typedef struct stbtt_fontinfo stbtt_fontinfo;
+
 namespace IPDF
 {
 	class Document
@@ -29,6 +31,8 @@ namespace IPDF
 			
 			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);
diff --git a/src/main.cpp b/src/main.cpp
index d7df87a..d5d4da8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,6 @@
 #include "main.h"
 #include <unistd.h> // Because we can.
+#include "stb_truetype.h"
 int main(int argc, char ** argv)
 {	
 	#ifndef __STDC_IEC_559__
@@ -81,11 +82,28 @@ int main(int argc, char ** argv)
 	}
 	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(0,1,1,0,0,1));
+		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)
@@ -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(0.1,0.1,0.8,0.8), 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), 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!");