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