allow multiple lua files to be used in lua_pictures

begin "stdlib" for skia in lua
add comments to scrape.lua



git-svn-id: http://skia.googlecode.com/svn/trunk@9206 2bbb7eff-a529-9590-31e7-b0007b416f81

tools/lua/lua_pictures.cpp

@@ -109,17 +109,20 @@ int tool_main(int argc, char** argv) {
         exit(-1);
     }
     if (FLAGS_luaFile.isEmpty()) {
-        SkDebugf("missing luaFile\n");
+        SkDebugf("missing luaFile(s)\n");
         exit(-1);
     }
 
-    SkAutoDataUnref data(read_into_data(FLAGS_luaFile[0]));
-
     SkAutoGraphics ag;
     SkAutoLua L("summarize");
-    if (!L.load(data->data(), data->size())) {
-        SkDebugf("failed to load luaFile %s\n", FLAGS_luaFile[0]);
-        exit(-1);
+
+    for (int i = 0; i < FLAGS_luaFile.count(); ++i) {
+        SkAutoDataUnref data(read_into_data(FLAGS_luaFile[i]));
+        SkDebugf("loading %s...\n", FLAGS_luaFile[i]);
+        if (!L.load(data->data(), data->size())) {
+            SkDebugf("failed to load luaFile %s\n", FLAGS_luaFile[i]);
+            exit(-1);
+        }
     }
 
     for (int i = 0; i < FLAGS_skpPath.count(); i ++) {

tools/lua/scrape.lua

@@ -1,11 +1,19 @@
+-- just a helper function to dump the parameters, for debugging
 function tostr(t)
     local str = ""
     for k, v in next, t do
-        str = str .. tostring(k) .. " "
-        if type(v) == "table" then
-            str = str .. "{ " .. tostr(v) .. "} "
+        if #str > 0 then
+            str = str .. ", "
+        end
+        if type(k) == "number" then
+            str = str .. "[" .. k .. "] = "
         else
-            str = str .. tostring(v) .. " "
+            str = str .. tostring(k) .. " = "
+        end
+        if type(v) == "table" then
+            str = str .. "{ " .. tostr(v) .. " }"
+        else
+            str = str .. tostring(v)
         end
     end
     return str
@@ -14,30 +22,25 @@ end
 canvas = {}
 total = 0
 
+-- called with the parameters to each canvas.draw call
 function accumulate(t)
-    local verb = t.verb
-    t.verb = nil
-
     total = total + 1
-    local n = canvas[verb] or 0
-    n = n + 1
-    canvas[verb] = n
+    local n = canvas[t.verb] or 0
+    canvas[t.verb] = n + 1
 
-    io.write(verb, " ")
-    io.write(tostr(t), "\n")
+    -- enable to dump all of the parameters we were sent
+    if false then
+        -- dump the params in t, specifically showing the verb first, which we
+        -- then nil out so it doesn't appear in tostr()
+        io.write(t.verb, " ")
+        t.verb = nil
+        io.write(tostr(t), "\n")
+    end
 end
 
+-- lua_pictures will call this function after all of the files have been
+-- "accumulated"
 function summarize()
     io.write("total ", total, "\n", tostr(canvas), "\n")
 end
 
---[[
-function drawsomething()
-    local s = skia_newsurface(100, 100)
-    local c = s:getcanvas();
-    c:setColor(1, 0, 0, 1)
-    c:drawRect(10, 10, 50, 50)
-    s:saveImage("image.png")
-end
---]]
-

tools/lua/skia.lua

@@ -0,0 +1,81 @@
+Sk = {}
+
+function Sk.isFinite(x)
+    return x * 0 == 0
+end
+
+-------------------------------------------------------------------------------
+
+Sk.Rect = { left = 0, top = 0, right = 0, bottom = 0 }
+Sk.Rect.__index = Sk.Rect
+
+function Sk.Rect.new(l, t, r, b)
+    local rect
+    if r then
+        -- 4 arguments
+        rect = { left = l, top = t, right = r, bottom = b }
+    elseif l then
+        -- 2 arguments
+        rect = { right = l, bottom = t }
+    else
+        -- 0 arguments
+        rect = {}
+    end
+    setmetatable(rect, Sk.Rect)
+    return rect;
+end
+
+function Sk.Rect:width()
+    return self.right - self.left
+end
+
+function Sk.Rect:height()
+    return self.bottom - self.top
+end
+
+function Sk.Rect:isEmpty()
+    return self:width() <= 0 or self:height() <= 0
+end
+
+function Sk.Rect:isFinite()
+    local value = self.left * 0
+    value = value * self.top
+    value = value * self.right
+    value = value * self.bottom
+    return 0 == value
+end
+
+function Sk.Rect:setEmpty()
+    self.left = 0
+    self.top = 0
+    self.right = 0
+    self.bottom = 0
+end
+
+function Sk.Rect:set(l, t, r, b)
+    self.left = l
+    self.top = t
+    self.right = r
+    self.bottom = b
+end
+
+function Sk.Rect:offset(dx, dy)
+    dy = dy or dx
+
+    self.left = self.left + dx
+    self.top = self.top + dy
+    self.right = self.right + dx
+    self.bottom = self.bottom + dy
+end
+
+function Sk.Rect:inset(dx, dy)
+    dy = dy or dx
+
+    self.left = self.left + dx
+    self.top = self.top + dy
+    self.right = self.right - dx
+    self.bottom = self.bottom - dy
+end
+
+-------------------------------------------------------------------------------
+