SkJpegCodec

Enables basic decoding for jpegs

Includes rewinding

565, YUV, and Jpeg encoding are not yet implemented

BUG=skia:3257

Review URL: https://codereview.chromium.org/1076923002

1 files changed, 77 insertions, 0 deletions

diff --git a/src/codec/SkJpegDecoderMgr.h b/src/codec/SkJpegDecoderMgr.h
new file mode 100644
index 0000000000..444e693742
--- /dev/null
+++ b/src/codec/SkJpegDecoderMgr.h
@@ -0,0 +1,77 @@
+/*
+ * 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 SkJpegDecoderMgr_DEFINED
+#define SkJpegDecoderMgr_DEFINED
+
+#include "SkCodec.h"
+#include "SkCodecPriv.h"
+#include "SkJpegUtility.h"
+#include "SkSwizzler.h"
+#include "SkTemplates.h"
+
+// stdio is needed for jpeglib
+#include <stdio.h>
+
+extern "C" {
+    #include "jpeglib.h"
+}
+
+class JpegDecoderMgr : SkNoncopyable {
+public:
+
+    /*
+     * Print a useful error message and return false
+     */
+    bool returnFalse(const char caller[]);
+
+    /*
+     * Print a useful error message and return a decode failure
+     */
+    SkCodec::Result returnFailure(const char caller[], SkCodec::Result result);
+
+    /*
+     * Create the decode manager
+     * Does not take ownership of stream
+     */
+    JpegDecoderMgr(SkStream* stream);
+
+    /*
+     * Initialize decompress struct
+     * Initialize the source manager
+     */
+    void  init();
+
+    /*
+     * Recommend a color type based on the encoded format
+     */
+    SkColorType getColorType();
+
+    /*
+     * Free memory used by the decode manager
+     */
+    ~JpegDecoderMgr();
+
+    /*
+     * Get the jump buffer in order to set an error return point
+     */
+    jmp_buf& getJmpBuf();
+
+    /*
+     * Get function for the decompress info struct
+     */
+    jpeg_decompress_struct* dinfo();
+
+private:
+
+    jpeg_decompress_struct fDInfo;
+    skjpeg_source_mgr      fSrcMgr;
+    skjpeg_error_mgr       fErrorMgr;
+    bool                   fInit;
+};
+
+#endif