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()
  19 {
  20         if(!style)
  21                 return;
  22
  23         Widget::autosize();
  24
  25         if(const Part *image_part = style->get_part("image"))
  26         {
  27                 const Sides &margin = image_part->get_margin();
  28                 if(image)
  29                 {
  30                         geom.w = max(geom.w, image->get_width()+margin.left+margin.right);
  31                         geom.h = max(geom.h, image->get_height()+margin.top+margin.bottom);
  32                 }
  33                 else
  34                 {
  35                         geom.w = max(geom.w, margin.left+margin.right);
  36                         geom.h = max(geom.h, margin.top+margin.bottom);
  37                 }
  38         }
  39
  40         rebuild();
  41 }
  42
  43 void Image::set_image(const GL::Texture2D *i)
  44 {
  45         image = i;
  46         signal_autosize_changed.emit();
  47         rebuild();
  48 }
  49
  50 void Image::set_keep_aspect(bool ka)
  51 {
  52         keep_aspect = ka;
  53         rebuild();
  54 }
  55
  56 void Image::rebuild_special(const Part &part, CachedPart &cache)
  57 {
  58         if(part.get_name()=="image")
  59         {
  60                 if(!image)
  61                 {
  62                         cache.texture = 0;
  63                         return;
  64                 }
  65
  66                 const Alignment &align = part.get_alignment();
  67                 Geometry rgeom = part.get_geometry();
  68                 align.apply(rgeom, geom, part.get_margin());
  69
  70                 if(keep_aspect)
  71                 {
  72                         float aspect = static_cast<float>(image->get_width())/image->get_height();
  73                         if(rgeom.w<rgeom.h*aspect)
  74                         {
  75                                 unsigned h = static_cast<unsigned>(rgeom.w/aspect);
  76                                 rgeom.y += (rgeom.h-h)*align.y;
  77                                 rgeom.h = h;
  78                         }
  79                         else
  80                         {
  81                                 unsigned w = static_cast<unsigned>(rgeom.h*aspect);
  82                                 rgeom.x += (rgeom.w-w)*align.x;
  83                                 rgeom.w = w;
  84                         }
  85                 }
  86
  87                 cache.texture = image;
  88                 cache.clear_mesh();
  89
  90                 GL::MeshBuilder bld(*cache.mesh);
  91                 bld.color(1.0f, 1.0f, 1.0f);
  92                 bld.begin(GL::QUADS);
  93                 bld.texcoord(0.0, 0.0);
  94                 bld.vertex(rgeom.x, rgeom.y);
  95                 bld.texcoord(1.0, 0.0);
  96                 bld.vertex(rgeom.x+rgeom.w, rgeom.y);
  97                 bld.texcoord(1.0, 1.0);
  98                 bld.vertex(rgeom.x+rgeom.w, rgeom.y+rgeom.h);
  99                 bld.texcoord(0.0, 1.0);
 100                 bld.vertex(rgeom.x, rgeom.y+rgeom.h);
 101                 bld.end();
 102         }
 103 }
 104
 105 } // namespace GLtk
 106 } // namespace Msp