source/image.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/gl/bindable.h>
   9 #include <msp/gl/immediate.h>
  10 #include <msp/gl/matrix.h>
  11 #include "image.h"
  12 #include "part.h"
  13
  14 using namespace std;
  15
  16 namespace Msp {
  17 namespace GLtk {
  18
  19 Image::Image(const Resources &r, const GL::Texture2D *i):
  20         Widget(r),
  21         image(i),
  22         keep_aspect(true)
  23 {
  24         focusable = false;
  25         update_style();
  26 }
  27
  28 void Image::set_image(const GL::Texture2D *i)
  29 {
  30         image = i;
  31 }
  32
  33 void Image::set_keep_aspect(bool ka)
  34 {
  35         keep_aspect = ka;
  36 }
  37
  38 void Image::render_special(const Part &part) const
  39 {
  40         if(part.get_name()=="image")
  41         {
  42                 if(!image)
  43                         return;
  44
  45                 const Alignment &align = part.get_alignment();
  46                 Geometry rgeom = part.get_geometry();
  47                 align.apply(rgeom, geom, part.get_margin());
  48
  49                 if(keep_aspect)
  50                 {
  51                         float aspect = static_cast<float>(image->get_width())/image->get_height();
  52                         if(rgeom.w<rgeom.h*aspect)
  53                         {
  54                                 unsigned h = static_cast<unsigned>(rgeom.w/aspect);
  55                                 rgeom.y += (rgeom.h-h)*align.y;
  56                                 rgeom.h = h;
  57                         }
  58                         else
  59                         {
  60                                 unsigned w = static_cast<unsigned>(rgeom.h*aspect);
  61                                 rgeom.x += (rgeom.w-w)*align.x;
  62                                 rgeom.w = w;
  63                         }
  64                 }
  65
  66                 GL::Bind _bind_tex(image);
  67                 GL::Immediate imm((GL::COLOR4_UBYTE, GL::TEXCOORD2, GL::VERTEX2));
  68                 imm.color(1.0f, 1.0f, 1.0f);
  69                 imm.begin(GL::QUADS);
  70                 imm.texcoord(0.0, 0.0);
  71                 imm.vertex(rgeom.x, rgeom.y);
  72                 imm.texcoord(1.0, 0.0);
  73                 imm.vertex(rgeom.x+rgeom.w, rgeom.y);
  74                 imm.texcoord(1.0, 1.0);
  75                 imm.vertex(rgeom.x+rgeom.w, rgeom.y+rgeom.h);
  76                 imm.texcoord(0.0, 1.0);
  77                 imm.vertex(rgeom.x, rgeom.y+rgeom.h);
  78                 imm.end();
  79         }
  80 }
  81
  82 } // namespace GLtk
  83 } // namespace Msp