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1 files changed, 145 insertions, 0 deletions

diff --git a/html/examples/combine4-10x15.lua b/html/examples/combine4-10x15.lua
new file mode 100644
index 0000000..6460bce
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+++ b/html/examples/combine4-10x15.lua
@@ -0,0 +1,145 @@
+--A script to compose 4 images
+
+require"imlua"
+require"imlua_process"
+require"iuplua"
+
+
+function CombineImages(comb_image)
+  local w = comb_image:Width()-offset
+  local h = comb_image:Height()-offset
+  local half_w = math.floor(w/2)
+  local half_h = math.floor(h/2)
+  local x = {0, 0,             half_w+offset, half_w+offset}
+  local y = {0, half_h+offset, 0,             half_h+offset}
+  
+  for i = 1, 4 do
+    local img_w = images[i]:Width()
+    local img_h = images[i]:Height()
+    
+    if (img_w ~= half_w or img_h ~= half_h) then
+      local rz_w, rz_h, img_aspect
+      
+      img_aspect = img_w/img_h
+      
+      -- keep image aspect ratio
+      if (img_aspect ~= aspect) then
+        if (img_aspect < aspect) then
+          rz_h = half_h
+          rz_w = math.floor(rz_h * img_aspect)
+        else
+          rz_w = half_w
+          rz_h = math.floor(rz_w / img_aspect)
+        end
+      else
+        rz_w = half_w
+        rz_h = half_h
+      end  
+      
+      if (img_w ~= rz_w or img_h ~= rz_h) then
+        resize_image = im.ImageCreate(rz_w, rz_h, im.RGB, im.BYTE)
+        im.ProcessResize(images[i], resize_image, 1) -- do bilinear interpolation
+        images[i]:Destroy()
+        images[i] = resize_image
+      end
+    end
+    
+    im.ProcessInsert(comb_image, images[i], comb_image, x[i], y[i]) -- insert resize in dst and place the result in dst
+  end
+end
+
+function Save_Combine_Image(comb_image)
+  local i=0
+  local filename
+  repeat
+    i=i+1
+    local num=1000+i
+    numstr=string.sub(tostring(num),-3)
+    filename = "..\\combine"..numstr..".jpg"
+    -- check if exists
+    local res,msg=io.open(filename)
+    io.close()
+  until not res
+  print("Saving:", filename)
+  comb_image:Save(filename, "JPEG")
+  os.execute(filename)
+end
+
+function LoadImages()
+  local max_w, max_h = 0, 0
+  for i = 1, 4 do
+    if (not files[i]) then
+      error("Error, must drop 4 files.")
+    end
+    print("Loading:", files[i])
+    images[i] = im.FileImageLoadBitmap(files[i])
+    if (not images[i]) then
+      error("Failed to load image: "..files[i])
+    end
+    local img_w = images[i]:Width()
+    local img_h = images[i]:Height()
+    if (img_w < img_h) then
+      -- always landscape (w>h)
+      local rot_image = im.ImageCreate(img_h, img_w, im.RGB, im.BYTE)
+      im.ProcessRotate90(images[i], rot_image, true)
+      images[i]:Destroy()
+      images[i] = rot_image
+      local t = img_w
+      img_w = img_h
+      img_h = t
+    end
+    if (max_w < img_w) then max_w = img_w end
+    if (max_h < img_h) then max_h = img_h end
+  end  
+  return max_w, max_h
+end
+
+function ReleaseAll(comb_image)
+  comb_image:Destroy()
+  for i = 1, 4 do
+    images[i]:Destroy()
+    images[i] = nil
+    files[i] = nil
+  end
+end
+
+--Script Starts
+
+files = {}
+images = {}
+aspect = 15/10
+offset = 20
+
+dlg = iup.dialog{
+        iup.label{title="Drop here 4 photos."}, 
+        title="Combine", 
+        size="150x50"}
+
+function dlg:dropfiles_cb(filename, num)
+  files[num+1] = filename
+  if (num == 0) then
+    local max_w, max_h = LoadImages()
+    local w, h = 2*max_w+offset, 2*max_h+offset
+    
+    if (w/h ~= aspect) then
+      if (w/h < aspect) then
+        w = h * aspect
+      else
+        h = w / aspect
+      end
+    end
+    
+    print("Combining...")
+    local comb_image = im.ImageCreate(w, h, im.RGB, im.BYTE)
+    -- white background
+    im.ProcessRenderConstant(comb_image, {255, 255, 255})
+    CombineImages(comb_image)
+    
+    Save_Combine_Image(comb_image)
+    
+    ReleaseAll(comb_image)
+  end
+end
+
+dlg:show()
+iup.MainLoop()