Add config options to run different GPU APIs to dm and nanobench

Add extended config specification form that can be used to run different
gpu backend with different APIs.

The configs can be specified with the form:
gpu(api=string,dit=bool,nvpr=bool,samples=int)

This replaces and removes the --gpuAPI flag.

All existing configs should still work.

Adds following documentation:

out/Debug/dm --help config

Flags:
    --config:	type: string	default: 565 8888 gpu nonrendering
        Options: 565 8888 debug gpu gpudebug gpudft gpunull msaa16 msaa4
        nonrendering null nullgpu nvprmsaa16 nvprmsaa4 pdf pdf_poppler skp svg
        xps or use extended form 'backend(option=value,...)'.

        Extended form: 'backend(option=value,...)'

        Possible backends and options:

        gpu(api=string,dit=bool,nvpr=bool,samples=int)	GPU backend
        	api	type: string	default: native.
        	    Select graphics API to use with gpu backend.
        	    Options:
        		native			Use platform default OpenGL or OpenGL ES backend.
        		gl    			Use OpenGL.
        		gles  			Use OpenGL ES.
        		debug 			Use debug OpenGL.
        		null  			Use null OpenGL.
        	dit	type: bool	default: false.
        	    Use device independent text.
        	nvpr	type: bool	default: false.
        	    Use NV_path_rendering OpenGL and OpenGL ES extension.
        	samples	type: int	default: 0.
        	    Use multisampling with N samples.

        Predefined configs:

        	gpu      	= gpu()
        	msaa4    	= gpu(samples=4)
        	msaa16   	= gpu(samples=16)
        	nvprmsaa4	= gpu(nvpr=true,samples=4)
        	nvprmsaa16	= gpu(nvpr=true,samples=16)
        	gpudft    	= gpu(dit=true)
        	gpudebug  	= gpu(api=debug)
        	gpunull   	= gpu(api=null)
        	debug     	= gpu(api=debug)
        	nullgpu   	= gpu(api=null)

BUG=skia:2992

Committed: https://skia.googlesource.com/skia/+/e13ca329fca4c28cf4e078561f591ab27b743d23
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1490113005

Committed: https://skia.googlesource.com/skia/+/c8b4336444e7b90382e04e33665fb3b8490b825b

Review URL: https://codereview.chromium.org/1490113005

1 files changed, 74 insertions, 0 deletions

diff --git a/tools/flags/SkCommonFlagsConfig.h b/tools/flags/SkCommonFlagsConfig.h
new file mode 100644
index 0000000000..423cf1118c
--- /dev/null
+++ b/tools/flags/SkCommonFlagsConfig.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SK_COMMON_FLAGS_CONFIG_H
+#define SK_COMMON_FLAGS_CONFIG_H
+
+#include "SkCommandLineFlags.h"
+
+#if SK_SUPPORT_GPU
+#include "GrContextFactory.h"
+#endif
+
+DECLARE_string(config);
+
+#if SK_SUPPORT_GPU
+class SkCommandLineConfigGpu;
+#endif
+
+// SkCommandLineConfig represents a Skia rendering configuration string.
+// The string has following form:
+// tag:
+//   [via-]*backend
+// where 'backend' consists of chars excluding hyphen or "angle-gl"
+// and each 'via' consists of chars excluding hyphen.
+class SkCommandLineConfig {
+  public:
+    SkCommandLineConfig(const SkString& tag, const SkString& backend,
+                        const SkTArray<SkString>& viaParts);
+    virtual ~SkCommandLineConfig();
+#if SK_SUPPORT_GPU
+    virtual const SkCommandLineConfigGpu* asConfigGpu() const { return nullptr; }
+#endif
+    const SkString& getTag() const { return fTag; }
+    const SkString& getBackend() const { return fBackend; }
+    const SkTArray<SkString>& getViaParts() const { return fViaParts; }
+  private:
+    SkString fTag;
+    SkString fBackend;
+    SkTArray<SkString> fViaParts;
+};
+
+#if SK_SUPPORT_GPU
+// SkCommandLineConfigGpu is a SkCommandLineConfig that extracts information out of the backend
+// part of the tag. It is constructed tags that have:
+// * backends of form "gpu(option=value,option2=value,...)"
+// * backends that represent a shorthand of above (such as "msaa16" representing "gpu(samples=16)")
+class SkCommandLineConfigGpu : public SkCommandLineConfig {
+  public:
+    typedef GrContextFactory::GLContextType ContextType;
+    SkCommandLineConfigGpu(const SkString& tag, const SkTArray<SkString>& viaParts,
+                           ContextType contextType, bool useNVPR, bool useDIText, int samples);
+    const SkCommandLineConfigGpu* asConfigGpu() const override { return this; }
+    ContextType getContextType() const { return fContextType; }
+    bool getUseNVPR() const { return fUseNVPR; }
+    bool getUseDIText() const { return fUseDIText; }
+    int getSamples() const { return fSamples; }
+
+  private:
+    ContextType fContextType;
+    bool fUseNVPR;
+    bool fUseDIText;
+    int fSamples;
+};
+#endif
+
+typedef SkTArray<SkAutoTDelete<SkCommandLineConfig>, true> SkCommandLineConfigArray;
+void ParseConfigs(const SkCommandLineFlags::StringArray& configList,
+                  SkCommandLineConfigArray* outResult);
+
+#endif