1 files changed, 349 insertions, 0 deletions
diff --git a/src/ftgl/FTFont/FTBufferFont.cpp b/src/ftgl/FTFont/FTBufferFont.cpp
new file mode 100644
index 0000000..e48e2ab
--- /dev/null
+++ b/src/ftgl/FTFont/FTBufferFont.cpp
@@ -0,0 +1,349 @@
+/*
+ * FTGL - OpenGL font library
+ *
+ * Copyright (c) 2008 Sam Hocevar <sam@zoy.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <wchar.h>
+
+#include "FTGL/ftgl.h"
+
+#include "FTInternals.h"
+#include "FTBufferFontImpl.h"
+
+
+//
+//  FTBufferFont
+//
+
+
+FTBufferFont::FTBufferFont(char const *fontFilePath) :
+    FTFont(new FTBufferFontImpl(this, fontFilePath))
+{}
+
+
+FTBufferFont::FTBufferFont(unsigned char const *pBufferBytes,
+                           size_t bufferSizeInBytes) :
+    FTFont(new FTBufferFontImpl(this, pBufferBytes, bufferSizeInBytes))
+{}
+
+
+FTBufferFont::~FTBufferFont()
+{}
+
+
+FTGlyph* FTBufferFont::MakeGlyph(FT_GlyphSlot ftGlyph)
+{
+    FTBufferFontImpl *myimpl = dynamic_cast<FTBufferFontImpl *>(impl);
+    if(!myimpl)
+    {
+        return NULL;
+    }
+
+    return myimpl->MakeGlyphImpl(ftGlyph);
+}
+
+
+//
+//  FTBufferFontImpl
+//
+
+
+FTBufferFontImpl::FTBufferFontImpl(FTFont *ftFont, const char* fontFilePath) :
+    FTFontImpl(ftFont, fontFilePath),
+    buffer(new FTBuffer())
+{
+    load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
+
+    glGenTextures(BUFFER_CACHE_SIZE, idCache);
+
+    for(int i = 0; i < BUFFER_CACHE_SIZE; i++)
+    {
+        stringCache[i] = NULL;
+        glBindTexture(GL_TEXTURE_2D, idCache[i]);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    }
+
+    lastString = 0;
+}
+
+
+FTBufferFontImpl::FTBufferFontImpl(FTFont *ftFont,
+                                   const unsigned char *pBufferBytes,
+                                   size_t bufferSizeInBytes) :
+    FTFontImpl(ftFont, pBufferBytes, bufferSizeInBytes),
+    buffer(new FTBuffer())
+{
+    load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
+
+    glGenTextures(BUFFER_CACHE_SIZE, idCache);
+
+    for(int i = 0; i < BUFFER_CACHE_SIZE; i++)
+    {
+        stringCache[i] = NULL;
+        glBindTexture(GL_TEXTURE_2D, idCache[i]);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    }
+
+    lastString = 0;
+}
+
+
+FTBufferFontImpl::~FTBufferFontImpl()
+{
+    glDeleteTextures(BUFFER_CACHE_SIZE, idCache);
+
+    for(int i = 0; i < BUFFER_CACHE_SIZE; i++)
+    {
+        if(stringCache[i])
+        {
+            free(stringCache[i]);
+        }
+    }
+
+    delete buffer;
+}
+
+
+FTGlyph* FTBufferFontImpl::MakeGlyphImpl(FT_GlyphSlot ftGlyph)
+{
+    return new FTBufferGlyph(ftGlyph, buffer);
+}
+
+
+bool FTBufferFontImpl::FaceSize(const unsigned int size,
+                                const unsigned int res)
+{
+    for(int i = 0; i < BUFFER_CACHE_SIZE; i++)
+    {
+        if(stringCache[i])
+        {
+            free(stringCache[i]);
+            stringCache[i] = NULL;
+        }
+    }
+
+    return FTFontImpl::FaceSize(size, res);
+}
+
+
+static inline GLuint NextPowerOf2(GLuint in)
+{
+     in -= 1;
+
+     in |= in >> 16;
+     in |= in >> 8;
+     in |= in >> 4;
+     in |= in >> 2;
+     in |= in >> 1;
+
+     return in + 1;
+}
+
+
+inline int StringCompare(void const *a, char const *b, int len)
+{
+    return len < 0 ? strcmp((char const *)a, b)
+                   : strncmp((char const *)a, b, len);
+}
+
+
+inline int StringCompare(void const *a, wchar_t const *b, int len)
+{
+    return len < 0 ? wcscmp((wchar_t const *)a, b)
+                   : wcsncmp((wchar_t const *)a, b, len);
+}
+
+
+inline char *StringCopy(char const *s, int len)
+{
+    if(len < 0)
+    {
+        return strdup(s);
+    }
+    else
+    {
+#ifdef HAVE_STRNDUP
+        return strndup(s, len);
+#else
+        char *s2 = (char*)malloc(len + 1);
+        memcpy(s2, s, len);
+        s2[len] = 0;
+        return s2;
+#endif
+    }
+}
+
+
+inline wchar_t *StringCopy(wchar_t const *s, int len)
+{
+    if(len < 0)
+    {
+#if defined HAVE_WCSDUP
+        return wcsdup(s);
+#else
+        len = (int)wcslen(s);
+#endif
+    }
+
+    wchar_t *s2 = (wchar_t *)malloc((len + 1) * sizeof(wchar_t));
+    memcpy(s2, s, len * sizeof(wchar_t));
+    s2[len] = 0;
+    return s2;
+}
+
+
+template <typename T>
+inline FTPoint FTBufferFontImpl::RenderI(const T* string, const int len,
+                                         FTPoint position, FTPoint spacing,
+                                         int renderMode)
+{
+    const float padding = 3.0f;
+    int width, height, texWidth, texHeight;
+    int cacheIndex = -1;
+    bool inCache = false;
+
+    // Protect blending functions, GL_BLEND and GL_TEXTURE_2D
+    glPushAttrib(GL_COLOR_BUFFER_BIT | GL_ENABLE_BIT);
+
+    // Protect glPixelStorei() calls
+    glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
+
+    glEnable(GL_BLEND);
+    glEnable(GL_TEXTURE_2D);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
+
+    // Search whether the string is already in a texture we uploaded
+    for(int n = 0; n < BUFFER_CACHE_SIZE; n++)
+    {
+        int i = (lastString + n + BUFFER_CACHE_SIZE) % BUFFER_CACHE_SIZE;
+
+        if(stringCache[i] && !StringCompare(stringCache[i], string, len))
+        {
+            cacheIndex = i;
+            inCache = true;
+            break;
+        }
+    }
+
+    // If the string was not found, we need to put it in the cache and compute
+    // its new bounding box.
+    if(!inCache)
+    {
+        // FIXME: this cache is not very efficient. We should first expire
+        // strings that are not used very often.
+        cacheIndex = lastString;
+        lastString = (lastString + 1) % BUFFER_CACHE_SIZE;
+
+        if(stringCache[cacheIndex])
+        {
+            free(stringCache[cacheIndex]);
+        }
+        // FIXME: only the first N bytes are copied; we want the first N chars.
+        stringCache[cacheIndex] = StringCopy(string, len);
+        bboxCache[cacheIndex] = BBox(string, len, FTPoint(), spacing);
+    }
+
+    FTBBox bbox = bboxCache[cacheIndex];
+
+    width = static_cast<int>(bbox.Upper().X() - bbox.Lower().X()
+                              + padding + padding + 0.5);
+    height = static_cast<int>(bbox.Upper().Y() - bbox.Lower().Y()
+                               + padding + padding + 0.5);
+
+    texWidth = NextPowerOf2(width);
+    texHeight = NextPowerOf2(height);
+
+    glBindTexture(GL_TEXTURE_2D, idCache[cacheIndex]);
+
+    // If the string was not found, we need to render the text in a new
+    // texture buffer, then upload it to the OpenGL layer.
+    if(!inCache)
+    {
+        buffer->Size(texWidth, texHeight);
+        buffer->Pos(FTPoint(padding, padding) - bbox.Lower());
+
+        advanceCache[cacheIndex] =
+              FTFontImpl::Render(string, len, FTPoint(), spacing, renderMode);
+
+        glBindTexture(GL_TEXTURE_2D, idCache[cacheIndex]);
+
+        glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
+        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+        /* TODO: use glTexSubImage2D later? */
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texWidth, texHeight, 0,
+                     GL_ALPHA, GL_UNSIGNED_BYTE, (GLvoid *)buffer->Pixels());
+
+        buffer->Size(0, 0);
+    }
+
+    FTPoint low = position + bbox.Lower();
+    FTPoint up = position + bbox.Upper();
+
+    glBegin(GL_QUADS);
+        glNormal3f(0.0f, 0.0f, 1.0f);
+        glTexCoord2f(padding / texWidth,
+                     (texHeight - height + padding) / texHeight);
+        glVertex2f(low.Xf(), up.Yf());
+        glTexCoord2f(padding / texWidth,
+                     (texHeight - padding) / texHeight);
+        glVertex2f(low.Xf(), low.Yf());
+        glTexCoord2f((width - padding) / texWidth,
+                     (texHeight - padding) / texHeight);
+        glVertex2f(up.Xf(), low.Yf());
+        glTexCoord2f((width - padding) / texWidth,
+                     (texHeight - height + padding) / texHeight);
+        glVertex2f(up.Xf(), up.Yf());
+    glEnd();
+
+    glPopClientAttrib();
+    glPopAttrib();
+
+    return position + advanceCache[cacheIndex];
+}
+
+
+FTPoint FTBufferFontImpl::Render(const char * string, const int len,
+                                 FTPoint position, FTPoint spacing,
+                                 int renderMode)
+{
+    return RenderI(string, len, position, spacing, renderMode);
+}
+
+
+FTPoint FTBufferFontImpl::Render(const wchar_t * string, const int len,
+                                 FTPoint position, FTPoint spacing,
+                                 int renderMode)
+{
+    return RenderI(string, len, position, spacing, renderMode);
+}
+