Initial commit of Minikin library

This is the initial draft of Minikin, a library intended to perform text
layout functions. This version does basic weight selection and font runs
for scripts, and also has a simple renderer for drawing into bitmaps,
but is lacking measurement, line breaking, and a number of other
important features. It also lacks caching and other performance
refinements.

Change-Id: I789a2e47d11d71202dc84b4751b51a5e2cd9c451

1 files changed, 43 insertions, 0 deletions

diff --git a/libs/minikin/AnalyzeStyle.cpp b/libs/minikin/AnalyzeStyle.cpp
new file mode 100644
index 0000000..0961645
--- /dev/null
+++ b/libs/minikin/AnalyzeStyle.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#include <minikin/AnalyzeStyle.h>
+
+namespace android {
+
+// should  we have a single FontAnalyzer class this stuff lives in, to avoid dup?
+static int32_t readU16(const uint8_t* data, size_t offset) {
+    return data[offset] << 8 | data[offset + 1];
+}
+
+bool analyzeStyle(const uint8_t* os2_data, size_t os2_size, int* weight, bool* italic) {
+    const size_t kUsWeightClassOffset = 4;
+    const size_t kFsSelectionOffset = 62;
+    const uint16_t kItalicFlag = (1 << 0);
+    if (os2_size < kFsSelectionOffset + 2) {
+        return false;
+    }
+    uint16_t weightClass = readU16(os2_data, kUsWeightClassOffset);
+    *weight = weightClass / 100;
+    uint16_t fsSelection = readU16(os2_data, kFsSelectionOffset);
+    *italic = (fsSelection & kItalicFlag) != 0;
+    return true;
+}
+
+}  // namespace android