add drawImageNine

this also exposes nine-patch drawing directly to devices, and creates a shared iterator for unrolling a nine-patch into single rect->rect draws.

BUG=skia:

Review URL: https://codereview.chromium.org/1211583003

1 files changed, 42 insertions, 27 deletions

diff --git a/gm/ninepatchstretch.cpp b/gm/ninepatchstretch.cpp
index 5031480aa5..267c41587b 100644
--- a/gm/ninepatchstretch.cpp
+++ b/gm/ninepatchstretch.cpp
@@ -6,15 +6,24 @@
  */
 
 #include "gm.h"
+#include "SkSurface.h"
 
-static void make_bitmap(SkBitmap* bitmap, SkIRect* center) {
+static SkSurface* make_surface(SkCanvas* root, int N) {
+    SkImageInfo info = SkImageInfo::MakeN32Premul(N, N);
+    SkSurface* surface = root->newSurface(info);
+    if (!surface) {
+        surface = SkSurface::NewRaster(info);
+    }
+    return surface;
+}
+
+static SkImage* make_image(SkCanvas* root, SkIRect* center) {
     const int kFixed = 28;
     const int kStretchy = 8;
     const int kSize = 2*kFixed + kStretchy;
 
-    bitmap->allocN32Pixels(kSize, kSize);
-    SkCanvas canvas(*bitmap);
-    canvas.clear(SK_ColorTRANSPARENT);
+    SkAutoTUnref<SkSurface> surface(make_surface(root, kSize));
+    SkCanvas* canvas = surface->getCanvas();
 
     SkRect r = SkRect::MakeWH(SkIntToScalar(kSize), SkIntToScalar(kSize));
     const SkScalar strokeWidth = SkIntToScalar(6);
@@ -26,39 +35,48 @@ static void make_bitmap(SkBitmap* bitmap, SkIRect* center) {
     paint.setAntiAlias(true);
 
     paint.setColor(0xFFFF0000);
-    canvas.drawRoundRect(r, radius, radius, paint);
+    canvas->drawRoundRect(r, radius, radius, paint);
     r.setXYWH(SkIntToScalar(kFixed), 0, SkIntToScalar(kStretchy), SkIntToScalar(kSize));
     paint.setColor(0x8800FF00);
-    canvas.drawRect(r, paint);
+    canvas->drawRect(r, paint);
     r.setXYWH(0, SkIntToScalar(kFixed), SkIntToScalar(kSize), SkIntToScalar(kStretchy));
     paint.setColor(0x880000FF);
-    canvas.drawRect(r, paint);
+    canvas->drawRect(r, paint);
+
+    return surface->newImageSnapshot();
 }
 
-namespace skiagm {
+static void image_to_bitmap(const SkImage* image, SkBitmap* bm) {
+    SkImageInfo info = SkImageInfo::MakeN32Premul(image->width(), image->height());
+    bm->allocPixels(info);
+    image->readPixels(info, bm->getPixels(), bm->rowBytes(), 0, 0);
+}
 
-class NinePatchStretchGM : public GM {
+class NinePatchStretchGM : public skiagm::GM {
 public:
-    SkBitmap fBM;
+    SkAutoTUnref<SkImage> fImage;
+    SkBitmap    fBitmap;
+    SkIRect     fCenter;
 
     NinePatchStretchGM() {}
 
 protected:
-    virtual SkString onShortName() {
+    SkString onShortName() override {
         return SkString("ninepatch-stretch");
     }
 
-    virtual SkISize onISize() {
-        return SkISize::Make(400, 400);
+    SkISize onISize() override {
+        return SkISize::Make(760, 400);
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
-        SkBitmap bm;
-        SkIRect center;
-        make_bitmap(&bm, &center);
+    void onDraw(SkCanvas* canvas) override {
+        if (NULL == fBitmap.pixelRef()) {
+            fImage.reset(make_image(canvas, &fCenter));
+            image_to_bitmap(fImage, &fBitmap);
+        }
 
         // amount of bm that should not be stretched (unless we have to)
-        const SkScalar fixed = SkIntToScalar(bm.width() - center.width());
+        const SkScalar fixed = SkIntToScalar(fBitmap.width() - fCenter.width());
 
         const SkTSize<SkScalar> size[] = {
             { fixed * 4 / 5, fixed * 4 / 5 },   // shrink in both axes
@@ -67,7 +85,7 @@ protected:
             { fixed * 4,     fixed * 4 }
         };
 
-        canvas->drawBitmap(bm, SkIntToScalar(10), SkIntToScalar(10), NULL);
+        canvas->drawBitmap(fBitmap, 10, 10, NULL);
 
         SkScalar x = SkIntToScalar(100);
         SkScalar y = SkIntToScalar(100);
@@ -80,18 +98,15 @@ protected:
                 int i = ix * 2 + iy;
                 SkRect r = SkRect::MakeXYWH(x + ix * fixed, y + iy * fixed,
                                             size[i].width(), size[i].height());
-                canvas->drawBitmapNine(bm, center, r, &paint);
+                canvas->drawBitmapNine(fBitmap, fCenter, r, &paint);
+                canvas->drawImageNine(fImage, fCenter, r.makeOffset(360, 0), &paint);
+
             }
         }
     }
 
 private:
-    typedef GM INHERITED;
+    typedef skiagm::GM INHERITED;
 };
+DEF_GM( return new NinePatchStretchGM; )
 
-//////////////////////////////////////////////////////////////////////////////
-
-static GM* MyFactory(void*) { return new NinePatchStretchGM; }
-static GMRegistry reg(MyFactory);
-
-}