Bmp Image Decoding

include/codec/SkCodecPriv.h

+/*
+ * Copyright 2015 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "SkCodec.h"
+#include "SkImageInfo.h"
+#include "SkTypes.h"
+
+/*
+ *
+ * Checks if alpha types are premul and unpremul
+ *
+ */
+static inline bool premul_and_unpremul(SkAlphaType dst, SkAlphaType src) {
+    return kPremul_SkAlphaType == dst && kUnpremul_SkAlphaType == src;
+}
+
+/*
+ *
+ * Get a byte from a buffer
+ * This method is unsafe, the caller is responsible for performing a check
+ *
+ */
+static inline uint8_t get_byte(uint8_t* buffer, uint32_t i) {
+    return buffer[i];
+}
+
+/*
+ *
+ * Get a short from a buffer
+ * This method is unsafe, the caller is responsible for performing a check
+ *
+ */
+static inline uint16_t get_short(uint8_t* buffer, uint32_t i) {
+    uint16_t result;
+    memcpy(&result, &(buffer[i]), 2);
+#ifdef SK_CPU_BENDIAN
+    return SkEndianSwap16(result);
+#else
+    return result;
+#endif
+}
+
+/*
+ *
+ * Get an int from a buffer
+ * This method is unsafe, the caller is responsible for performing a check
+ *
+ */
+static inline uint32_t get_int(uint8_t* buffer, uint32_t i) {
+    uint32_t result;
+    memcpy(&result, &(buffer[i]), 4);
+#ifdef SK_CPU_BENDIAN
+    return SkEndianSwap32(result);
+#else
+    return result;
+#endif
+}