source/image.cpp

   1 #include <msp/gl/meshbuilder.h>
   2 #include "image.h"
   3 #include "part.h"
   4 #include "style.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace GLtk {
  10
  11 Image::Image(const GL::Texture2D *i):
  12         image(i),
  13         keep_aspect(true)
  14 {
  15         focusable = false;
  16 }
  17
  18 void Image::autosize_special(const Part &part, Geometry &ageom) const
  19 {
  20         if(part.get_name()=="image")
  21         {
  22                 const Sides &margin = part.get_margin();
  23                 if(image)
  24                 {
  25                         ageom.w = max(ageom.w, image->get_width()+margin.left+margin.right);
  26                         ageom.h = max(ageom.h, image->get_height()+margin.top+margin.bottom);
  27                 }
  28                 else
  29                 {
  30                         ageom.w = max(ageom.w, margin.left+margin.right);
  31                         ageom.h = max(ageom.h, margin.top+margin.bottom);
  32                 }
  33         }
  34 }
  35
  36 void Image::set_image(const GL::Texture2D *i)
  37 {
  38         image = i;
  39         signal_autosize_changed.emit();
  40         rebuild();
  41 }
  42
  43 void Image::set_keep_aspect(bool ka)
  44 {
  45         keep_aspect = ka;
  46         rebuild();
  47 }
  48
  49 void Image::rebuild_special(const Part &part)
  50 {
  51         if(part.get_name()=="image")
  52         {
  53                 if(!image)
  54                         return;
  55
  56                 const Alignment &align = part.get_alignment();
  57                 Geometry rgeom = part.get_geometry();
  58                 align.apply(rgeom, geom, part.get_margin());
  59
  60                 if(keep_aspect)
  61                 {
  62                         float aspect = static_cast<float>(image->get_width())/image->get_height();
  63                         if(rgeom.w<rgeom.h*aspect)
  64                         {
  65                                 unsigned h = static_cast<unsigned>(rgeom.w/aspect);
  66                                 rgeom.y += (rgeom.h-h)*align.y;
  67                                 rgeom.h = h;
  68                         }
  69                         else
  70                         {
  71                                 unsigned w = static_cast<unsigned>(rgeom.h*aspect);
  72                                 rgeom.x += (rgeom.w-w)*align.x;
  73                                 rgeom.w = w;
  74                         }
  75                 }
  76
  77                 GL::MeshBuilder bld(part_cache.create_mesh(part, *image));
  78                 bld.color(1.0f, 1.0f, 1.0f);
  79                 bld.begin(GL::QUADS);
  80                 bld.texcoord(0.0, 0.0);
  81                 bld.vertex(rgeom.x, rgeom.y);
  82                 bld.texcoord(1.0, 0.0);
  83                 bld.vertex(rgeom.x+rgeom.w, rgeom.y);
  84                 bld.texcoord(1.0, 1.0);
  85                 bld.vertex(rgeom.x+rgeom.w, rgeom.y+rgeom.h);
  86                 bld.texcoord(0.0, 1.0);
  87                 bld.vertex(rgeom.x, rgeom.y+rgeom.h);
  88                 bld.end();
  89         }
  90 }
  91
  92 } // namespace GLtk
  93 } // namespace Msp