From b549688c443e796784c4ae63cbd7191571551df0 Mon Sep 17 00:00:00 2001
From: bjorn <tie.372@gmail.com>
Date: Mon, 22 Jan 2018 18:49:45 -0800
Subject: [PATCH] Add a bunch of Rasterizer functions;

---
 src/api/types/rasterizer.c | 58 ++++++++++++++++++++++++++++++++++++++
 src/data/rasterizer.c      | 21 ++++++++++++++
 src/data/rasterizer.h      |  5 ++++
 3 files changed, 84 insertions(+)

diff --git a/src/api/types/rasterizer.c b/src/api/types/rasterizer.c
index 50706909..2b6ad417 100644
--- a/src/api/types/rasterizer.c
+++ b/src/api/types/rasterizer.c
@@ -1,5 +1,63 @@
 #include "api.h"
+#include "data/rasterizer.h"
+
+int l_lovrRasterizerGetHeight(lua_State* L) {
+  Rasterizer* rasterizer = luax_checktype(L, 1, Rasterizer);
+  lua_pushinteger(L, rasterizer->height);
+  return 1;
+}
+
+int l_lovrRasterizerGetAdvance(lua_State* L) {
+  Rasterizer* rasterizer = luax_checktype(L, 1, Rasterizer);
+  lua_pushinteger(L, rasterizer->advance);
+  return 1;
+}
+
+int l_lovrRasterizerGetAscent(lua_State* L) {
+  Rasterizer* rasterizer = luax_checktype(L, 1, Rasterizer);
+  lua_pushinteger(L, rasterizer->ascent);
+  return 1;
+}
+
+int l_lovrRasterizerGetDescent(lua_State* L) {
+  Rasterizer* rasterizer = luax_checktype(L, 1, Rasterizer);
+  lua_pushinteger(L, rasterizer->descent);
+  return 1;
+}
+
+int l_lovrRasterizerGetLineHeight(lua_State* L) {
+  Rasterizer* rasterizer = luax_checktype(L, 1, Rasterizer);
+  lua_pushinteger(L, rasterizer->height * 1.25f);
+  return 1;
+}
+
+int l_lovrRasterizerGetGlyphCount(lua_State* L) {
+  Rasterizer* rasterizer = luax_checktype(L, 1, Rasterizer);
+  lua_pushinteger(L, rasterizer->glyphCount);
+  return 1;
+}
+
+int l_lovrRasterizerHasGlyphs(lua_State* L) {
+  Rasterizer* rasterizer = luax_checktype(L, 1, Rasterizer);
+  bool hasGlyphs = true;
+  for (int i = 2; i <= lua_gettop(L); i++) {
+    if (lua_type(L, i) == LUA_TSTRING) {
+      hasGlyphs &= lovrRasterizerHasGlyphs(rasterizer, lua_tostring(L, i));
+    } else {
+      hasGlyphs &= lovrRasterizerHasGlyph(rasterizer, luaL_checkinteger(L, i));
+    }
+  }
+  lua_pushboolean(L, hasGlyphs);
+  return 1;
+}
 
 const luaL_Reg lovrRasterizer[] = {
+  { "getHeight", l_lovrRasterizerGetHeight },
+  { "getAdvance", l_lovrRasterizerGetAdvance },
+  { "getAscent", l_lovrRasterizerGetAscent },
+  { "getDescent", l_lovrRasterizerGetDescent },
+  { "getLineHeight", l_lovrRasterizerGetLineHeight },
+  { "getGlyphCount", l_lovrRasterizerGetGlyphCount },
+  { "hasGlyphs", l_lovrRasterizerHasGlyphs },
   { NULL, NULL }
 };
diff --git a/src/data/rasterizer.c b/src/data/rasterizer.c
index e7124a28..555ed8af 100644
--- a/src/data/rasterizer.c
+++ b/src/data/rasterizer.c
@@ -81,9 +81,11 @@ Rasterizer* lovrRasterizerCreate(Blob* blob, int size) {
   rasterizer->ftHandle = face;
   rasterizer->blob = blob;
   rasterizer->size = size;
+  rasterizer->glyphCount = face->num_glyphs;
 
   FT_Size_Metrics metrics = face->size->metrics;
   rasterizer->height = metrics.height >> 6;
+  rasterizer->advance = metrics.max_advance >> 6;
   rasterizer->ascent = metrics.ascender >> 6;
   rasterizer->descent = metrics.descender >> 6;
 
@@ -99,6 +101,25 @@ void lovrRasterizerDestroy(const Ref* ref) {
   free(rasterizer);
 }
 
+bool lovrRasterizerHasGlyph(Rasterizer* rasterizer, uint32_t character) {
+  FT_Face face = rasterizer->ftHandle;
+  return FT_Get_Char_Index(face, character) != 0;
+}
+
+bool lovrRasterizerHasGlyphs(Rasterizer* rasterizer, const char* str) {
+  int len = strlen(str);
+  const char* end = str + len;
+  unsigned int codepoint;
+  size_t bytes;
+
+  bool hasGlyphs = true;
+  while ((bytes = utf8_decode(str, end, &codepoint)) > 0) {
+    hasGlyphs &= lovrRasterizerHasGlyph(rasterizer, codepoint);
+    str += bytes;
+  }
+  return hasGlyphs;
+}
+
 void lovrRasterizerLoadGlyph(Rasterizer* rasterizer, uint32_t character, Glyph* glyph) {
   FT_Face face = rasterizer->ftHandle;
   FT_Error err = FT_Err_Ok;
diff --git a/src/data/rasterizer.h b/src/data/rasterizer.h
index 48c44fe4..e11fd94a 100644
--- a/src/data/rasterizer.h
+++ b/src/data/rasterizer.h
@@ -2,6 +2,7 @@
 #include "lib/map/map.h"
 #include "util.h"
 #include <stdint.h>
+#include <stdbool.h>
 
 #pragma once
 
@@ -12,7 +13,9 @@ typedef struct {
   void* ftHandle;
   Blob* blob;
   int size;
+  int glyphCount;
   int height;
+  int advance;
   int ascent;
   int descent;
 } Rasterizer;
@@ -34,5 +37,7 @@ typedef map_t(Glyph) map_glyph_t;
 
 Rasterizer* lovrRasterizerCreate(Blob* blob, int size);
 void lovrRasterizerDestroy(const Ref* ref);
+bool lovrRasterizerHasGlyph(Rasterizer* fontData, uint32_t character);
+bool lovrRasterizerHasGlyphs(Rasterizer* fontData, const char* str);
 void lovrRasterizerLoadGlyph(Rasterizer* fontData, uint32_t character, Glyph* glyph);
 int lovrRasterizerGetKerning(Rasterizer* fontData, uint32_t left, uint32_t right);