Demo slides for color presentation

samplecode/SampleApp.cpp

Index: samplecode/SampleApp.cpp
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 9e7e651b1c6e91400e78fa1031fdf1f00cb49110..580747eb171d8c3243ffb6a8fdb0585e68fc7c7d 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -53,7 +53,7 @@ const struct {
 } gConfig[] = {
     { kN32_SkColorType,      false, "L32" },
     { kN32_SkColorType,       true, "S32" },
-    { kRGBA_F16_SkColorType,  true, "F16" },
+//    { kRGBA_F16_SkColorType,  true, "F16" },
 };
 
 static const char* find_config_name(const SkImageInfo& info) {
@@ -857,7 +857,7 @@ SampleWindow::SampleWindow(void* hwnd, int argc, char** argv, DeviceManager* dev
     int itemID;
 
     itemID = fAppMenu->appendList("ColorType", "ColorType", sinkID, 0,
-                                  gConfig[0].fName, gConfig[1].fName, gConfig[2].fName, nullptr);
+                                  gConfig[0].fName, gConfig[1].fName, nullptr);
     fAppMenu->assignKeyEquivalentToItem(itemID, 'C');
 
     itemID = fAppMenu->appendList("Device Type", "Device Type", sinkID, 0,
@@ -1059,6 +1059,25 @@ void SampleWindow::draw(SkCanvas* canvas) {
         }
     }
 
+    {
+        int count = canvas->save();
+        canvas->resetMatrix();
+        SkPaint p;
+        p.setTextSize(36);
+        p.setColor(0xFFFFFFFF);
+        SkPaint p2;
+        p2.setTextSize(36);
+        p2.setColor(0xFF000000);
+        if (SkImageInfoIsGammaCorrect(info())) {
+            canvas->drawText("Gamma Correct: Yes", 18, 50, 900, p);
+            canvas->drawText("Gamma Correct: Yes", 18, 50, 850, p2);
+        } else {
+            canvas->drawText("Gamma Correct: No", 17, 50, 900, p);
+            canvas->drawText("Gamma Correct: No", 17, 50, 850, p2);
+        }
+        canvas->restoreToCount(count);
+    }
+
     if (fShowZoomer && !fSaveToPdf) {
         showZoomer(canvas);
     }