privatize SkDeviceProfile.h

git-svn-id: http://skia.googlecode.com/svn/trunk@5045 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 99 insertions, 0 deletions

diff --git a/src/core/SkDeviceProfile.h b/src/core/SkDeviceProfile.h
new file mode 100644
index 0000000000..2a3f4bb67d
--- /dev/null
+++ b/src/core/SkDeviceProfile.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkDeviceProfile_DEFINED
+#define SkDeviceProfile_DEFINED
+
+#include "SkRefCnt.h"
+
+class SkDeviceProfile : public SkRefCnt {
+public:
+    SK_DECLARE_INST_COUNT(SkDeviceProfile)
+
+    enum LCDConfig {
+        kNone_LCDConfig,   // disables LCD text rendering, uses A8 instead
+        kRGB_Horizontal_LCDConfig,
+        kBGR_Horizontal_LCDConfig,
+        kRGB_Vertical_LCDConfig,
+        kBGR_Vertical_LCDConfig
+    };
+
+    enum FontHintLevel {
+        kNone_FontHintLevel,
+        kSlight_FontHintLevel,
+        kNormal_FontHintLevel,
+        kFull_FontHintLevel,
+        kAuto_FontHintLevel
+    };
+
+    /**
+     *  gammaExp is typically between 1.0 and 2.2. For no gamma adjustment,
+     *  specify 1.0
+     *
+     *  contrastScale will be pinned between 0.0 and 1.0. For no contrast
+     *  adjustment, specify 0.0
+     *
+     *  @param config   Describes the LCD layout for this device. If this is set
+     *                  to kNone, then all requests for LCD text will be
+     *                  devolved to A8 antialiasing.
+     *
+     *  @param level    The hinting level to be used, IF the paint specifies
+     *                  "default". Otherwise the paint's hinting level will be
+     *                  respected.
+     */
+    static SkDeviceProfile* Create(float gammaExp,
+                                   float contrastScale,
+                                   LCDConfig,
+                                   FontHintLevel);
+
+    /**
+     *  Returns the global default profile, that is used if no global profile is
+     *  specified with SetGlobal(), or if NULL is specified to SetGlobal().
+     *  The references count is *not* incremented, and the caller should not
+     *  call unref().
+     */
+    static SkDeviceProfile* GetDefault();
+
+    /**
+     *  Return the current global profile (or the default if no global had yet
+     *  been set) and increment its reference count. The call *must* call unref()
+     *  when it is done using it.
+     */
+    static SkDeviceProfile* RefGlobal();
+
+    /**
+     *  Make the specified profile be the global value for all subsequently
+     *  instantiated devices. Does not affect any existing devices.
+     *  Increments the reference count on the profile.
+     *  Specify NULL for the "identity" profile (where there is no gamma or
+     *  contrast correction).
+     */
+    static void SetGlobal(SkDeviceProfile*);
+
+    float getFontGammaExponent() const { return fGammaExponent; }
+    float getFontContrastScale() const { return fContrastScale; }
+
+    /**
+     *  Given a luminance byte (0 for black, 0xFF for white), generate a table
+     *  that applies the gamma/contrast settings to linear coverage values.
+     */
+    void generateTableForLuminanceByte(U8CPU lumByte, uint8_t table[256]) const;
+
+private:
+    SkDeviceProfile(float gammaExp, float contrastScale, LCDConfig,
+                    FontHintLevel);
+
+    float           fGammaExponent;
+    float           fContrastScale;
+    LCDConfig       fLCDConfig;
+    FontHintLevel   fFontHintLevel;
+
+    typedef SkRefCnt INHERITED;
+};
+
+#endif
+