PDF: Add text support with a font framework (font embedding to come).
Supports fakeBold, underline, strikethrough, mode (fill, stroke, both), size, skew, alignment (left, center, right).
Missing is drawFontOnPath and font lookup and embedding.
Changed SkPDFString to support how it is used from drawText methods.
Moved compile assert into SkTypes.
Moved constants and utility function used to support fakeBold, underline, and strikethrough into higher level locations.
Review URL: http://codereview.appspot.com/2946041
git-svn-id: http://skia.googlecode.com/svn/trunk@624 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/utils/SkTextFormatParams.h b/include/utils/SkTextFormatParams.h
new file mode 100644
index 0000000..3306270
--- /dev/null
+++ b/include/utils/SkTextFormatParams.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SkTextFormatParams_DEFINES
+#define SkTextFormatParams_DEFINES
+
+#include "SkScalar.h"
+#include "SkTypes.h"
+
+// Fraction of the text size to lower a strike through line below the baseline.
+#define kStdStrikeThru_Offset (-SK_Scalar1 * 6 / 21)
+// Fraction of the text size to lower a underline below the baseline.
+#define kStdUnderline_Offset (SK_Scalar1 / 9)
+// Fraction of the text size to use for a strike through or under-line.
+#define kStdUnderline_Thickness (SK_Scalar1 / 18)
+
+// The fraction of text size to embolden fake bold text scales with text size.
+// At 9 points or below, the stroke width is increased by text size / 24.
+// At 36 points and above, it is increased by text size / 32. In between,
+// it is interpolated between those values.
+static const SkScalar kStdFakeBoldInterpKeys[] = {
+ SkIntToScalar(9),
+ SkIntToScalar(36)
+};
+static const SkScalar kStdFakeBoldInterpValues[] = {
+ SK_Scalar1/24,
+ SK_Scalar1/32
+};
+SK_COMPILE_ASSERT(SK_ARRAY_COUNT(kStdFakeBoldInterpKeys) ==
+ SK_ARRAY_COUNT(kStdFakeBoldInterpValues),
+ mismatched_array_size);
+static const int kStdFakeBoldInterpLength =
+ SK_ARRAY_COUNT(kStdFakeBoldInterpKeys);
+
+#endif //SkTextFormatParams_DEFINES