add code-style for slides

BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/697923002

resources/slides.lua

@@ -10,7 +10,7 @@ end
 
 load_file("slides_utils")
 
-gSlides = parse_file(io.open("/skia/trunk/resources/slides_content.lua", "r"))
+gSlides = parse_file(io.open("/skia/trunk/resources/slides_content2.lua", "r"))
 
 function make_rect(l, t, r, b)
     return { left = l, top = t, right = r, bottom = b }
@@ -26,12 +26,26 @@ function make_paint(typefacename, stylebits, size, color)
     return paint
 end
 
-function drawSlide(canvas, slide, template)
-    template = template.slide   -- need to sniff the slide to know if we're title or slide
+function drawSlide(canvas, slide, master_template)
+    template = master_template.slide   -- need to sniff the slide to know if we're title or slide
 
     local x = template.margin_x
     local y = template.margin_y
 
+    if slide.blockstyle == "code" then
+        local paint = master_template.codePaint
+        local fm = paint:getFontMetrics()
+        local height = #slide * (fm.descent - fm.ascent)
+        y = (480 - height) / 2
+        for i = 1, #slide do
+            local node = slide[i]
+            y = y - fm.ascent
+            canvas:drawText(node.text, x, y, paint)
+            y = y + fm.descent
+        end
+        return
+    end
+
     local scale = 1.25
     for i = 1, #slide do
         local node = slide[i]
@@ -72,6 +86,7 @@ function SkiaPoint_make_template()
     return {
         title = title,
         slide = slide,
+        codePaint = make_paint("Courier", 0, 24, { a=1, r=.9, g=.9, b=.9 }),
     }
 end
 

resources/slides_content.lua

@@ -21,6 +21,7 @@ One Team -- many clients
 
 <transition= rotate>
 
+<blockstyle = code>
 Optimize for CPU variety
 - x86 - 32bit (SSE, SSE2, ...), 64bit
 - Arm - thumb, arm, NEON, ... 64bit?

resources/slides_content2.lua

@@ -0,0 +1,96 @@
+Skia Update
+
+Skia : Overview
+- portable 2D graphics engine
+- src: geometry, images, text
+- dst : raster, gpu, pdf, displaylist, *user-defined
+- attr: shaders, filters, antialiasing, blending, *user-defined
+
+Skia : Clients
+- Blink : direct and via GraphicsContext
+- Chrome : ui/gfx and compositor
+- Android framework
+- third parties : e.g. Mozilla
+- code.google.com/p/skia
+
+Skia : Porting
+- C++ and some SIMD assembly
+- Fonts : CoreText, FreeType, GDI, DirectWrite, *user-define
+- Threads : wrappers for native apis
+- Memory : wrappers for [new, malloc, discardable]
+
+Skia : API
+- SkCanvas
+-- save, saveLayer, restore
+-- translate, scale, rotate, concat
+-- clipRect, clipPath
+- SkPaint
+-- color, stroking, antialiasing, filtering
+-- typeface, textSize, text-flags
+-- effects: shader, color-filter, image-filter, mask-filter, xfermode
+
+<blockstyle = code>
+void onDraw(SkCanvas* canvas) {
+    SkPaint paint;
+    paint.setFoo(...);
+    canvas->drawRect(..., paint);
+    paint.setBar(...);
+    canvas->drawOval(..., paint);
+}
+
+<blockstyle = code>
+void onDraw(SkCanvas* canvas) {
+    canvas->drawRect(..., fPaint0);
+    canvas->drawOval(..., fPaint1);
+}
+
+Skia In Blink : GraphicsContext
+- Similar
+-- rects, paths, images, text
+-- matrices, clips
+- Different
+-- save/restore affect matrix+clip PLUS all paint settings
+-- both fill and stroke settings are specified
+-- hence: fillRect(), strokeRect(), drawRect()
+
+<blockstyle = code>
+void onDraw(GraphicsContext* gc) {
+    gc->save();
+    gc->setFoo(...);
+    gc->fillRect(...);
+    gc->setBar(...);
+    gc->fillOval(...);
+    gc->restore();
+}
+
+Skia In Blink : more than GraphicsContext
+- Simple wrappers
+-- FloatRect -- SkRect
+-- Path -- SkPath
+- Font.h + 21 others
+-- SkTypeface + flags
+- Image.h + 25 others
+-- SkBitmap, SkImage
+
+Skia In Blink : Fonts
+- Assist with code-sharing between platforms
+- Runtime switch between GDI and DirectWrite
+- Add SkFontMgr for selection
+- Push LCD decision-making out of Blink
+
+Skia In Blink : Record-Time-Rasterization
+- Direct rendering during “Paint” pass
+-- Image scaling, filters
+-- SVG patterns, masks
+- Problematic in modern Blink
+-- CTM not always known/knowable
+-- Rendering backend not always known (gpu or cpu)
+-- Rasterization takes (too much) time
+
+Skia In Blink : RTR response
+- SkImageFilter w/ CPU and GPU implementations
+- SkPaint::FilterLevel : none, low, medium (mipmaps), high
+- SkPicture for caching SVG
+- SkPicture + saveLayer() for masks
+-- PathOps for resolving complex paths
+- SkPictureShader for device-independent patterns

resources/slides_utils.lua

@@ -58,6 +58,10 @@ function parse_transition_type(s)
     return s:match("^<%s*transition%s*=%s*(%a+)%s*>$")
 end
 
+function parse_blockstyle_type(s)
+    return s:match("^<%s*blockstyle%s*=%s*(%a+)%s*>$")
+end
+
 function parse_file(file)
     local slides = {}
     local block = {}
@@ -71,14 +75,21 @@ function parse_file(file)
             end
         else
             local transition_type = parse_transition_type(s)
+            local blockstyle = parse_blockstyle_type(s)
             if transition_type then
                 block["transition"] = transition_type
+            elseif blockstyle then
+                block["blockstyle"] = blockstyle
             else
-                local n = count_hypens(s)
-                block[#block + 1] = {
-                    indent = n,
-                    text = trim_ws(s:sub(n + 1, -1))
-                }
+                if block.blockstyle == "code" then
+                    block[#block + 1] = { text = line }
+                else
+                    local n = count_hypens(s)
+                    block[#block + 1] = {
+                        indent = n,
+                        text = trim_ws(s:sub(n + 1, -1))
+                    }
+                end
             end
         end
     end