208 lines
7.3 KiB
C++
208 lines
7.3 KiB
C++
// Filename: dynamicTextGlyph.cxx
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// Created by: drose (09Feb02)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "dynamicTextGlyph.h"
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#ifdef HAVE_FREETYPE
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#include "dynamicTextPage.h"
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#include "geomTextGlyph.h"
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#include "qpgeomTextGlyph.h"
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#include "qpgeomVertexData.h"
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#include "qpgeomVertexFormat.h"
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#include "qpgeomTriangles.h"
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#include "qpgeomVertexWriter.h"
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#include "textureAttrib.h"
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#include "transparencyAttrib.h"
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#include "renderState.h"
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#include "config_gobj.h"
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////////////////////////////////////////////////////////////////////
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// Function: DynamicTextGlyph::Destructor
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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DynamicTextGlyph::
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~DynamicTextGlyph() {
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}
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////////////////////////////////////////////////////////////////////
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// Function: DynamicTextGlyph::get_row
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// Access: Public
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// Description: Returns a pointer to the first byte in the pixel
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// buffer associated with the leftmost pixel in the
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// indicated row, where 0 is the topmost row and _y_size
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// - _margin * 2 - 1 is the bottommost row.
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////////////////////////////////////////////////////////////////////
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unsigned char *DynamicTextGlyph::
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get_row(int y) {
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nassertr(y >= 0 && y < _y_size - _margin * 2, (unsigned char *)NULL);
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nassertr(_page != (DynamicTextPage *)NULL, (unsigned char *)NULL);
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// First, offset y by the glyph's start.
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y += _y + _margin;
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// Also, get the x start.
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int x = _x + _margin;
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// Invert y.
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y = _page->get_y_size() - 1 - y;
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int offset = (y * _page->get_x_size()) + x;
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return _page->modify_ram_image() + offset;
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}
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////////////////////////////////////////////////////////////////////
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// Function: DynamicTextGlyph::erase
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// Access: Public
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// Description: Erases the glyph from the texture map.
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////////////////////////////////////////////////////////////////////
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void DynamicTextGlyph::
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erase() {
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nassertv(_page != (DynamicTextPage *)NULL);
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nassertv(_page->has_ram_image());
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int ysizetop = _page->get_y_size() - 1;
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int width = _page->get_x_size();
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unsigned char *buffer = _page->modify_ram_image();
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for (int y = _y; y < _y + _y_size; y++) {
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int offset = (ysizetop - y) * width + _x;
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memset(buffer + offset, 0, _x_size);
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: DynamicTextGlyph::make_geom
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// Access: Public
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// Description: Creates the actual geometry for the glyph. The
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// parameters bitmap_top and bitmap_left are from
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// FreeType, and indicate the position of the top left
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// corner of the bitmap relative to the glyph's origin.
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// The advance number represents the number of pixels
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// the pen should be advanced after drawing this glyph.
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////////////////////////////////////////////////////////////////////
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void DynamicTextGlyph::
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make_geom(int bitmap_top, int bitmap_left, float advance, float poly_margin,
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float tex_x_size, float tex_y_size,
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float font_pixels_per_unit, float tex_pixels_per_unit) {
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nassertv(_page != (DynamicTextPage *)NULL);
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// This function should not be called twice.
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nassertv(_geom_count == 0);
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tex_x_size += _margin * 2;
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tex_y_size += _margin * 2;
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// Determine the corners of the rectangle in geometric units.
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float tex_poly_margin = poly_margin / tex_pixels_per_unit;
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float origin_y = bitmap_top / font_pixels_per_unit;
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float origin_x = bitmap_left / font_pixels_per_unit;
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float top = origin_y + tex_poly_margin;
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float left = origin_x - tex_poly_margin;
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float bottom = origin_y - tex_y_size / tex_pixels_per_unit - tex_poly_margin;
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float right = origin_x + tex_x_size / tex_pixels_per_unit + tex_poly_margin;
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// And the corresponding corners in UV units.
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float uv_top = 1.0f - (float)(_y - poly_margin) / _page->get_y_size();
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float uv_left = (float)(_x - poly_margin) / _page->get_x_size();
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float uv_bottom = 1.0f - (float)(_y + poly_margin + tex_y_size) / _page->get_y_size();
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float uv_right = (float)(_x + poly_margin + tex_x_size) / _page->get_x_size();
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// Create a corresponding triangle pair. We use a pair of indexed
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// triangles rther than a single triangle strip, to avoid the bad
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// vertex duplication behavior with lots of two-triangle strips.
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if (use_qpgeom) {
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PT(qpGeomVertexData) vdata = new qpGeomVertexData
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(string(), qpGeomVertexFormat::get_v3t2(),
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qpGeom::UH_static);
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qpGeomVertexWriter vertex(vdata, InternalName::get_vertex());
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qpGeomVertexWriter texcoord(vdata, InternalName::get_texcoord());
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vertex.add_data3f(left, 0, top);
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vertex.add_data3f(left, 0, bottom);
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vertex.add_data3f(right, 0, top);
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vertex.add_data3f(right, 0, bottom);
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texcoord.add_data2f(uv_left, uv_top);
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texcoord.add_data2f(uv_left, uv_bottom);
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texcoord.add_data2f(uv_right, uv_top);
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texcoord.add_data2f(uv_right, uv_bottom);
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PT(qpGeomTriangles) tris = new qpGeomTriangles(qpGeom::UH_static);
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tris->add_vertex(0);
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tris->add_vertex(1);
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tris->add_vertex(2);
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tris->close_primitive();
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tris->add_vertex(2);
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tris->add_vertex(1);
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tris->add_vertex(3);
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tris->close_primitive();
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PT(qpGeom) geom = new qpGeomTextGlyph(this);
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geom->set_vertex_data(vdata);
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geom->add_primitive(tris);
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_geom = geom;
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// The above will increment our _geom_count to 1. Reset it back
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// down to 0, since our own internal Geom doesn't count.
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nassertv(_geom_count == 1);
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_geom_count--;
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} else {
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PT(Geom) geom = new GeomTextGlyph(this);
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_geom = geom;
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// The above will increment our _geom_count to 1. Reset it back
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// down to 0, since our own internal Geom doesn't count.
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nassertv(_geom_count == 1);
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_geom_count--;
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PTA_Vertexf coords;
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coords.push_back(Vertexf(left, 0, top));
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coords.push_back(Vertexf(left, 0, bottom));
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coords.push_back(Vertexf(right, 0, top));
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coords.push_back(Vertexf(right, 0, bottom));
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PTA_TexCoordf texcoords;
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texcoords.push_back(TexCoordf(uv_left, uv_top));
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texcoords.push_back(TexCoordf(uv_left, uv_bottom));
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texcoords.push_back(TexCoordf(uv_right, uv_top));
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texcoords.push_back(TexCoordf(uv_right, uv_bottom));
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PTA_Colorf colors;
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colors.push_back(Colorf(1.0f, 1.0f, 1.0f, 1.0f));
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PTA_int lengths;
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lengths.push_back(4);
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geom->set_coords(coords);
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geom->set_texcoords(texcoords, G_PER_VERTEX);
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geom->set_colors(colors, G_OVERALL);
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geom->set_lengths(lengths);
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geom->set_num_prims(1);
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}
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_state = RenderState::make(TextureAttrib::make(_page),
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TransparencyAttrib::make(TransparencyAttrib::M_alpha));
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_advance = advance / font_pixels_per_unit;
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}
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#endif // HAVE_FREETYPE
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