Developing disable gpu on adreno

common/browser.js

@@ -65,7 +65,8 @@ var AscBrowser = {
     isAndroidNativeApp : false,
 	safariVersion : 17004001,
 	isTelegramWebView : false,
-	maxTouchPoints : 0
+	maxTouchPoints : 0,
+	willReadFrequently : false
 };
 
 // user agent lower case
@@ -270,6 +271,40 @@ var UI = {
 	}
 };
 
+if (AscBrowser.isChrome)
+{
+	try
+	{
+		let canvas = document.createElement("canvas");
+		let ctxGL = canvas.getContext("webgl") || canvas.getContext("experimental-webgl");
+
+		if (ctxGL)
+		{
+			let debugInfo = ctxGL.getExtension('WEBGL_debug_renderer_info');
+			if (debugInfo)
+			{
+				let renderer = ctxGL.getParameter(debugInfo.UNMASKED_RENDERER_WEBGL);
+				if (renderer)
+				{
+					renderer = renderer.toLowerCase();
+					if (-1 !== renderer.indexOf("qualcomm") && -1 !== renderer.indexOf("adreno"))
+						AscBrowser.willReadFrequently = true;
+				}
+			}
+		}
+	}
+	catch (e)
+	{
+	}
+}
+
+AscBrowser.getContext2D = function(canvas)
+{
+	if (AscBrowser.willReadFrequently)
+		return canvas.getContext('2d', { willReadFrequently: true });
+	return canvas.getContext('2d');
+};
+
     //--------------------------------------------------------export----------------------------------------------------
     window['AscCommon'] = window['AscCommon'] || {};
     window['AscCommon'].AscBrowser = AscBrowser;

common/libfont/file.js

@@ -274,7 +274,7 @@
 			this.TempImage = document.createElement("canvas");
 			this.TempImage.width = w;
 			this.TempImage.height = h;
-			var ctxD = this.TempImage.getContext("2d");
+			var ctxD = AscCommon.AscBrowser.getContext2D(this.TempImage);
 			var pixDst = null;
 
 			if (this.m_oCanvas != null)
@@ -375,7 +375,7 @@
 			this.m_oCanvas.width = (width == 0) ? 1 : width;
 			this.m_oCanvas.height = (height == 0) ? 1 : height;
 
-			this.m_oContext = this.m_oCanvas.getContext('2d');
+			this.m_oContext = AscCommon.AscBrowser.getContext2D(this.m_oCanvas);
 			this.m_oContext.globalCompositeOperation = "source-in";
 		}
 	};

slide/Drawing/DrawingDocument.js

@@ -6679,7 +6679,7 @@ function CSlideDrawer()
 				this.CachedCanvas.width  = _need_pix_width + 100;
 				this.CachedCanvas.height = _need_pix_height + 100;
 
-				this.CachedCanvasCtx = this.CachedCanvas.getContext('2d');
+				this.CachedCanvasCtx = AscCommon.AscBrowser.getContext2D(this.CachedCanvas);
 			}
 			else
 			{

slide/Drawing/HtmlPage.js

@@ -2497,9 +2497,7 @@
 		if (null == canvas)
 			return;
 
-
+		var context = AscCommon.AscBrowser.getContext2D(canvas);
-
-		var context = canvas.getContext("2d");
 		var _width = canvas.width;
 		var _height = canvas.height;