source/image.cpp

   1 #include <msp/gl/bindable.h>
   2 #include <msp/gl/immediate.h>
   3 #include <msp/gl/matrix.h>
   4 #include "image.h"
   5 #include "part.h"
   6 #include "style.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GLtk {
  12
  13 Image::Image(const GL::Texture2D *i):
  14         image(i),
  15         keep_aspect(true)
  16 {
  17         focusable = false;
  18 }
  19
  20 void Image::autosize()
  21 {
  22         if(!style)
  23                 return;
  24
  25         Widget::autosize();
  26
  27         if(const Part *image_part = style->get_part("image"))
  28         {
  29                 const Sides &margin = image_part->get_margin();
  30                 if(image)
  31                 {
  32                         geom.w = max(geom.w, image->get_width()+margin.left+margin.right);
  33                         geom.h = max(geom.h, image->get_height()+margin.top+margin.bottom);
  34                 }
  35                 else
  36                 {
  37                         geom.w = max(geom.w, margin.left+margin.right);
  38                         geom.h = max(geom.h, margin.top+margin.bottom);
  39                 }
  40         }
  41 }
  42
  43 void Image::set_image(const GL::Texture2D *i)
  44 {
  45         image = i;
  46         signal_autosize_changed.emit();
  47 }
  48
  49 void Image::set_keep_aspect(bool ka)
  50 {
  51         keep_aspect = ka;
  52 }
  53
  54 void Image::render_special(const Part &part) const
  55 {
  56         if(part.get_name()=="image")
  57         {
  58                 if(!image)
  59                         return;
  60
  61                 const Alignment &align = part.get_alignment();
  62                 Geometry rgeom = part.get_geometry();
  63                 align.apply(rgeom, geom, part.get_margin());
  64
  65                 if(keep_aspect)
  66                 {
  67                         float aspect = static_cast<float>(image->get_width())/image->get_height();
  68                         if(rgeom.w<rgeom.h*aspect)
  69                         {
  70                                 unsigned h = static_cast<unsigned>(rgeom.w/aspect);
  71                                 rgeom.y += (rgeom.h-h)*align.y;
  72                                 rgeom.h = h;
  73                         }
  74                         else
  75                         {
  76                                 unsigned w = static_cast<unsigned>(rgeom.h*aspect);
  77                                 rgeom.x += (rgeom.w-w)*align.x;
  78                                 rgeom.w = w;
  79                         }
  80                 }
  81
  82                 GL::Bind _bind_tex(image);
  83                 GL::Immediate imm((GL::COLOR4_UBYTE, GL::TEXCOORD2, GL::VERTEX2));
  84                 imm.color(1.0f, 1.0f, 1.0f);
  85                 imm.begin(GL::QUADS);
  86                 imm.texcoord(0.0, 0.0);
  87                 imm.vertex(rgeom.x, rgeom.y);
  88                 imm.texcoord(1.0, 0.0);
  89                 imm.vertex(rgeom.x+rgeom.w, rgeom.y);
  90                 imm.texcoord(1.0, 1.0);
  91                 imm.vertex(rgeom.x+rgeom.w, rgeom.y+rgeom.h);
  92                 imm.texcoord(0.0, 1.0);
  93                 imm.vertex(rgeom.x, rgeom.y+rgeom.h);
  94                 imm.end();
  95         }
  96 }
  97
  98 } // namespace GLtk
  99 } // namespace Msp