Edit
kc3-lang/ftgl/src/FTGlyph/FTTextureGlyph.cpp
Frank Heckenbach
- src/FTGlyph/FTTextureGlyph.cpp
-
/* * FTGL - OpenGL font library * * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz> * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net> * * 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 <math.h> #include "FTGL/ftgl.h" #include "FTInternals.h" #include "FTTextureGlyphImpl.h" #define FTGL_ASSERTS_SHOULD_SOFT_FAIL #ifdef FTGL_ASSERTS_SHOULD_SOFT_FAIL # define FTASSERT_FAIL do {} while(0) #else # define FTASSERT_FAIL do { int *a = (int*)0x0; *a = 0xD15EA5ED; } while(0) #endif #define FTASSERT(x) \ if (!(x)) \ { \ static int count = 0; \ if (count++ < 8) \ fprintf(stderr, "ASSERTION FAILED (%s:%d): %s\n", \ __FILE__, __LINE__, #x); \ FTASSERT_FAIL; \ if (count == 8) \ fprintf(stderr, "\\__ last warning for this assertion\n"); \ } // // FTGLTextureGlyph // FTTextureGlyph::FTTextureGlyph(FT_GlyphSlot glyph, int id, int xOffset, int yOffset, int width, int height) : FTGlyph(new FTTextureGlyphImpl(glyph, id, xOffset, yOffset, width, height)) {} FTTextureGlyph::~FTTextureGlyph() {} const FTPoint& FTTextureGlyph::Render(const FTPoint& pen, int renderMode) { FTTextureGlyphImpl *myimpl = dynamic_cast<FTTextureGlyphImpl *>(impl); return myimpl->RenderImpl(pen, renderMode); } // // FTGLTextureGlyphImpl // GLint FTTextureGlyphImpl::activeTextureID = 0; FTTextureGlyphImpl::FTTextureGlyphImpl(FT_GlyphSlot glyph, int id, int xOffset, int yOffset, int width, int height) : FTGlyphImpl(glyph), destWidth(0), destHeight(0), glTextureID(id) { /* FIXME: need to propagate the render mode all the way down to * here in order to get FT_RENDER_MODE_MONO aliased fonts. */ err = FT_Render_Glyph(glyph, FT_RENDER_MODE_NORMAL); if(err || glyph->format != ft_glyph_format_bitmap) { return; } FT_Bitmap bitmap = glyph->bitmap; destWidth = bitmap.width; destHeight = bitmap.rows; if(destWidth && destHeight) { glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT); glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE); glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); GLint w,h; glBindTexture(GL_TEXTURE_2D, glTextureID); glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &w); glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &h); FTASSERT(xOffset >= 0); FTASSERT(yOffset >= 0); FTASSERT(destWidth >= 0); FTASSERT(destHeight >= 0); FTASSERT(xOffset + destWidth <= w); FTASSERT(yOffset + destHeight <= h); if (yOffset + destHeight > h) { // We'll only get here if we are soft-failing our asserts. In that // case, since the data we're trying to put into our texture is // too long, we'll only copy a portion of the image. destHeight = h - yOffset; } if (destHeight >= 0) { // convert bitmap fonts std::vector <unsigned char> data_converted; if(bitmap.num_grays == 1) { bBox = FTBBox(0, 0, 0, destWidth, destHeight, 0); data_converted.resize(destWidth * destHeight, 0); int n = 0; for(int y = 0; y < destHeight; ++y) { unsigned char* src = bitmap.pitch < 0 ? bitmap.buffer + (y - destHeight + 1) * bitmap.pitch : bitmap.buffer + y * bitmap.pitch; unsigned char c = 0; for(int x = 0; x < destWidth; ++x) { if (x % 8 == 0) c = *src++; data_converted[n++] = ((c >> (7 - (x % 8))) & 1) * 255; } } } glTexSubImage2D(GL_TEXTURE_2D, 0, xOffset, yOffset, destWidth, destHeight, GL_ALPHA, GL_UNSIGNED_BYTE, !data_converted.empty() ? data_converted.data() : bitmap.buffer); } glPopClientAttrib(); } // 0 // +----+ // | | // | | // | | // +----+ // 1 uv[0].X(static_cast<float>(xOffset) / static_cast<float>(width)); uv[0].Y(static_cast<float>(yOffset) / static_cast<float>(height)); uv[1].X(static_cast<float>(xOffset + destWidth) / static_cast<float>(width)); uv[1].Y(static_cast<float>(yOffset + destHeight) / static_cast<float>(height)); corner = FTPoint(glyph->bitmap_left, glyph->bitmap_top); } FTTextureGlyphImpl::~FTTextureGlyphImpl() {} const FTPoint& FTTextureGlyphImpl::RenderImpl(const FTPoint& pen, int /*renderMode*/) { float dx, dy; if(activeTextureID != glTextureID) { glBindTexture(GL_TEXTURE_2D, (GLuint)glTextureID); activeTextureID = glTextureID; } dx = floor(pen.Xf() + corner.Xf()); dy = floor(pen.Yf() + corner.Yf()); glBegin(GL_QUADS); glTexCoord2f(uv[0].Xf(), uv[0].Yf()); glVertex3f(dx, dy, pen.Zf()); glTexCoord2f(uv[0].Xf(), uv[1].Yf()); glVertex3f(dx, dy - destHeight, pen.Zf()); glTexCoord2f(uv[1].Xf(), uv[1].Yf()); glVertex3f(dx + destWidth, dy - destHeight, pen.Zf()); glTexCoord2f(uv[1].Xf(), uv[0].Yf()); glVertex3f(dx + destWidth, dy, pen.Zf()); glEnd(); return advance; }