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-rw-r--r--src/libjin/graphics/fonts/ttf.cpp456
1 files changed, 456 insertions, 0 deletions
diff --git a/src/libjin/graphics/fonts/ttf.cpp b/src/libjin/graphics/fonts/ttf.cpp
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+++ b/src/libjin/graphics/fonts/ttf.cpp
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+#include "../../core/configuration.h"
+#if defined(jin_graphics)
+
+#include <stdio.h>
+
+#include "../../common/array.hpp"
+
+#include "../gl.h"
+#include "../color.h"
+#include "../shaders/shader.h"
+
+#include "ttf.h"
+#include "page.h"
+
+#define STB_TRUETYPE_IMPLEMENTATION
+#include "stb/stb_truetype.h"
+
+using namespace JinEngine::Graphics::Shaders;
+
+namespace JinEngine
+{
+ namespace Graphics
+ {
+ namespace Fonts
+ {
+
+ //////////////////////////////////////////////////////////////////////////////////////////////////////
+ // TTFData
+ //////////////////////////////////////////////////////////////////////////////////////////////////////
+
+ TTFData::TTFData(const unsigned char* d, unsigned int s)
+ {
+ raw.size = s;
+ raw.data = (unsigned char*)malloc(s);
+ memcpy(raw.data, d, s);
+ if (!stbtt_InitFont(&info, (const unsigned char*)raw.data, 0))
+ {
+ delete raw.data;
+ throw 0;
+ }
+ /* push default fontsize */
+ pushTTFsize(FONT_SIZE);
+ }
+
+ TTFData::~TTFData()
+ {
+ free(raw.data);
+ }
+
+ TTF* TTFData::createTTF(unsigned fontSize)
+ {
+ TTF* ttf;
+ try
+ {
+ ttf = new TTF(this, fontSize);
+ }
+ catch (...)
+ {
+ return nullptr;
+ }
+ return ttf;
+ }
+
+ /*
+ * (0, 0)
+ * +--------------+ ascent
+ * | +--------+ |
+ * | | | |
+ * | | bitmap | |
+ * +--|--------|--+ baseline
+ * | +--------+ |
+ * +--|-----------+ decent
+ * | |
+ * leftSideBearing |
+ * advanceWidth
+ */
+ void TTFData::getVMetrics(int* baseline, int* descent)
+ {
+ float scale = scales.back();
+ int ascent;
+ stbtt_GetFontVMetrics(&info, &ascent, descent, 0);
+ *baseline = (int)(ascent*scale) + 1; // slight adjustment
+ *descent = *baseline - (int)(*descent*scale) + 1;
+ }
+
+ void TTFData::getHMetrics(unsigned int codepoint, int* advanceWidth, int* leftSideBearing)
+ {
+ float scale = scales.back();
+ int adw, lsb;
+ stbtt_GetCodepointHMetrics(&info, codepoint, &adw, &lsb);
+ *advanceWidth = (int)(adw*scale);
+ *leftSideBearing = (int)(lsb*scale);
+ }
+
+ void TTFData::pushTTFsize(unsigned int fs)
+ {
+ float sc = stbtt_ScaleForPixelHeight(&info, fs);
+ scales.push_back(sc);
+ }
+
+ void TTFData::popTTFsize()
+ {
+ /* always keep default ttf size on the bottom of stack */
+ if (scales.size() > 1)
+ scales.pop_back();
+ }
+
+ Channel* TTFData::getCodepointBitmapAlpha(unsigned int codepoint, int* width, int* height, int* xoff, int* yoff) const
+ {
+ float scale = scales.back();
+ Channel* bitmap = stbtt_GetCodepointBitmap(&info, scale, scale, codepoint, width, height, xoff, yoff);
+ return bitmap;
+ }
+
+ Color* TTFData::getCodepointBitmap(unsigned int codepoint, int* width, int* height, int* xoff, int* yoff) const
+ {
+ float scale = scales.back();
+ Channel* bitmap = stbtt_GetCodepointBitmap(&info, scale, scale, codepoint, width, height, xoff, yoff);
+ int w = *width, h = *height;
+ //int xo = *xoff, yo = *yoff;
+ Color* bitmap32 = new Color[w*h];
+ for (int y = 0; y < h; ++y)
+ {
+ for (int x = 0; x < w; ++x)
+ {
+ bitmap32[x + y * w].set(0xff, 0xff, 0xff, bitmap[x + y * w]);
+ }
+ }
+ free(bitmap);
+ return bitmap32;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////////////////////////////
+ // TTF
+ //////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include "../shaders/built-in/font.shader.h"
+
+ using namespace std;
+ using namespace JinEngine::Math;
+
+ const int TTF::TEXTURE_WIDTHS[] = { 128, 256, 256, 512, 512, 1024, 1024 };
+ const int TTF::TEXTURE_HEIGHTS[] = { 128, 128, 256, 256, 512, 512, 1024 };
+
+ /* little endian unicode */
+ static const char* unicodeLittleEndian(const char* p, unsigned* res)
+ {
+ }
+
+ //TTF* TTF::createTTF(TTFData* fontData, unsigned int fontSzie)
+ //{
+ // TTF* ttf;
+ // try
+ // {
+ // ttf = new TTF(fontData, fontSzie);
+ // }
+ // catch (...)
+ // {
+ // return nullptr;
+ // }
+ // return ttf;
+ //}
+
+ TTF::TTF(TTFData* f, unsigned int fontSize)
+ : Font(fontSize)
+ , cursor(0, 0)
+ , ttf(f)
+ {
+ ttf->pushTTFsize(fontSize);
+ ttf->getVMetrics(&baseline, &descent);
+ estimateSize();
+ ttf->popTTFsize();
+ /* create a default texture */
+ createAtlas();
+ }
+
+ /* estimate the size of atlas texture */
+ void TTF::estimateSize()
+ {
+ for (int level = 0; level <= TEXTURE_SIZE_LEVEL_MAX; ++level)
+ {
+ if (descent * (descent*0.8) * 96 <= TEXTURE_WIDTHS[level] * TEXTURE_HEIGHTS[level])
+ {
+ textureWidth = TEXTURE_WIDTHS[level];
+ textureHeight = TEXTURE_HEIGHTS[level];
+ break;
+ }
+ }
+ }
+
+ TTF::~TTF()
+ {
+ }
+
+ GLuint TTF::createAtlas()
+ {
+ GLuint t;
+ gl.flushError();
+ t = gl.genTexture();
+ gl.bindTexture2D(t);
+ gl.setTexParameter(GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ gl.setTexParameter(GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ gl.setTexParameter(GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ gl.setTexParameter(GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ gl.texImage(GL_RGBA8, textureWidth, textureHeight, GL_RGBA, GL_UNSIGNED_BYTE);
+ if (glGetError() != GL_NO_ERROR)
+ {
+ glDeleteTextures(1, &t);
+
+ return 0;
+ }
+ atlases.push_back(t);
+
+ return t;
+ }
+
+ void TTF::render(const Content& t, int x, int y, int lineheight, int spacing)
+ {
+ Page* page = typeset(t, lineheight, spacing);
+ render(page, x, y);
+ delete page;
+ }
+
+ Page* TTF::typeset(const Content& text, int lineheight, int spacing)
+ {
+ Page* page = new Page();
+ page->font = this;
+ vector<GlyphArrayDrawInfo>& glyphinfolist = page->glyphinfolist;
+ vector<GlyphVertex>& glyphvertices = page->glyphvertices;
+ int texture = -1;
+ TTFGlyph* glyph = nullptr;
+ GlyphVertex vertex;
+ Vector2<int> p(0, 0);
+ int i = 0;
+
+ #define glyphvertices_push(_x, _y, _u, _v) \
+ vertex.x = _x; vertex.y = _y;\
+ vertex.u = _u; vertex.v = _v;\
+ glyphvertices.push_back(vertex);
+
+ #define glyphlize(c)\
+ do{\
+ glyph = &findGlyph(c); \
+ if (texture != glyph->atlas) \
+ { \
+ GlyphArrayDrawInfo info; \
+ info.start = i; \
+ info.count = 0; \
+ info.texture = glyph->atlas; \
+ texture = glyph->atlas; \
+ glyphinfolist.push_back(info); \
+ } \
+ glyphinfolist[glyphinfolist.size() - 1].count += 4; \
+ TTFGlyph::Bbox& bbox = glyph->bbox; \
+ glyphvertices_push(p.x(), p.y(), bbox.x, bbox.y); \
+ glyphvertices_push(p.x(), p.y() + glyph->height, bbox.x, bbox.y + bbox.h); \
+ glyphvertices_push(p.x() + glyph->width, p.y() + glyph->height, bbox.x + bbox.w, bbox.y + bbox.h); \
+ glyphvertices_push(p.x() + glyph->width, p.y(), bbox.x + bbox.w, bbox.y); \
+ }while(0)
+
+ for (Codepoint c : text)
+ {
+ if (c == 0x0D)
+ continue;
+ if (c == 0x0A)
+ {
+ /* new line */
+ p.y() += lineheight;
+ p.x() = 0;
+ continue;
+ }
+ if (c == 0x09)
+ {
+ // tab = 4*space
+ unsigned cw = getCharWidth(0x20);
+ p.x() += cw * 4;
+ continue;
+ }
+ glyphlize(c);
+ p.x() += glyph->width + spacing;
+ i += 4;
+ }
+ getTextBox(text, &page->size.w(), &page->size.h(), lineheight, spacing);
+ return page;
+ }
+
+ Page* TTF::typeset(const Text& text, int lineheight, int spacing)
+ {
+ return typeset(*text, lineheight, spacing);
+ }
+
+ void TTF::render(const Page* page, int x, int y)
+ {
+ Shader* shader = gl.getShader();
+ const vector<GlyphArrayDrawInfo>& glyphinfolist = page->glyphinfolist;
+ const vector<GlyphVertex>& glyphvertices = page->glyphvertices;
+ Matrix modelMatrix = gl.getModelViewMatrix(x, y, 1, 1, 0, 0, 0);
+ shader->begin()
+ .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
+ .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix());
+ for (int i = 0; i < glyphinfolist.size(); ++i)
+ {
+ const GlyphArrayDrawInfo& info = glyphinfolist[i];
+ shader->uploadVertices(2, GL_INT, sizeof(GlyphVertex), &glyphvertices[info.start].x)
+ .uploadUV(2, GL_FLOAT, sizeof(GlyphVertex), &glyphvertices[info.start].u);
+ gl.bindTexture2D(info.texture);
+ gl.drawArrays(GL_QUADS, 0, info.count);
+
+ }
+ shader->end();
+ }
+
+ void TTF::render(const Text& text, int x, int y, int lineheight, int spacing /* = 0 */)
+ {
+ render(*text, x, y, lineheight, spacing);
+ }
+
+ int TTF::getCharWidth(int c)
+ {
+ int adw, lsb;
+ ttf->pushTTFsize(mFontSize);
+ ttf->getHMetrics(c, &adw, &lsb);
+ ttf->popTTFsize();
+ return adw;
+ }
+
+ int TTF::getCharHeight(int c)
+ {
+ return descent;
+ }
+
+ int TTF::getTextWidth(const Content& t, int spacing)
+ {
+ ttf->pushTTFsize(mFontSize);
+ int res = 0;
+ int tmp = 0;
+ for (Codepoint c : t)
+ {
+ if (c == 0x0D)
+ continue;
+ if (c == 0x0A)
+ {
+ tmp = 0;
+ continue;
+ }
+ tmp += getCharWidth(c) + spacing;
+ if (tmp > res)
+ res = tmp;
+ }
+ ttf->popTTFsize();
+ return res;
+ }
+
+ int TTF::getTextHeight(const Content& t, int lineheight)
+ {
+ ttf->pushTTFsize(mFontSize);
+ int res = 0;
+ bool newline = true;
+ for (Codepoint c : t)
+ {
+ if (c == 0x0A)
+ newline = true;
+ else if (c == 0x0D);
+ else if (newline)
+ {
+ newline = false;
+ res += lineheight;
+ }
+ }
+ ttf->popTTFsize();
+ return res;
+ }
+
+ void TTF::getTextBox(const Content& text, int* w, int* h, int lineheight, int spacing)
+ {
+ ttf->pushTTFsize(mFontSize);
+ *w = 0;
+ *h = 0;
+ int tmp = 0;
+ bool newline = true;
+ for (Codepoint c : text)
+ {
+ if (c == 0x0D)
+ continue;
+ if (c == 0x0A)
+ {
+ tmp = 0;
+ newline = true;
+ continue;
+ }
+ else if (newline)
+ {
+ newline = false;
+ *h += lineheight;
+ }
+ tmp += getCharWidth(c) + spacing;
+ if (tmp > *w)
+ *w = tmp;
+ }
+ ttf->popTTFsize();
+ }
+
+ TTF::TTFGlyph& TTF::bakeGlyph(unsigned int character)
+ {
+ int w, h, xoff, yoff;
+ ttf->pushTTFsize(mFontSize);
+ GLuint atlas = atlases.back();
+ const Color* bitmap = ttf->getCodepointBitmap(character, &w, &h, &xoff, &yoff);
+ int adw, lsb;
+ {
+ /* bake glyph */
+ ttf->getHMetrics(character, &adw, &lsb);
+ ttf->popTTFsize();
+ if (cursor.x() + adw > textureWidth)
+ {
+ cursor.x() = 0;
+ cursor.y() += descent;
+ if (cursor.y() + descent * 2 > textureHeight)
+ {
+ /* create new atlas */
+ atlas = createAtlas();
+ cursor.y() = 0;
+ }
+ }
+ gl.bindTexture2D(atlas);
+ gl.texSubImage(cursor.x() + xoff, cursor.y() + yoff + baseline, w, h, GL_RGBA, GL_UNSIGNED_BYTE, bitmap);
+ gl.bindTexture2D();
+ delete[] bitmap;
+ }
+ TTFGlyph glyph;
+ glyph.atlas = atlas;
+ glyph.bbox.x = cursor.x() / (float)textureWidth;
+ glyph.bbox.y = cursor.y() / (float)textureHeight;
+ glyph.bbox.w = adw / (float)textureWidth;
+ glyph.bbox.h = descent / (float)textureHeight;
+ glyph.width = adw;
+ glyph.height = descent;
+ glyphs.insert(std::pair<unsigned int, TTFGlyph>(character, glyph));
+ cursor.x() += adw;
+ return glyphs[character];
+ }
+
+ TTF::TTFGlyph& TTF::findGlyph(unsigned int character)
+ {
+ map<unsigned int, TTFGlyph>::iterator it = glyphs.find(character);
+ if (it != glyphs.end())
+ return it->second;
+ else
+ return bakeGlyph(character);
+ }
+
+ } // namespace Fonts
+ } // namespace Graphics
+} // namespace JinEngine
+
+#endif // defined(jin_graphics) \ No newline at end of file
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