JPEG support: introducing jpeg encoding for spice bitmaps

1 files changed, 91 insertions, 0 deletions

diff --git a/client/jpeg_decoder.h b/client/jpeg_decoder.h
new file mode 100644
index 00000000..5c38cfa7
--- /dev/null
+++ b/client/jpeg_decoder.h
@@ -0,0 +1,91 @@
+/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+   Copyright (C) 2010 Red Hat, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _H_JPEG_DECODER
+#define _H_JPEG_DECODER
+
+#include "common.h"
+#include "canvas_base.h"
+
+#ifdef WIN32
+/* We need some hacks to avoid warnings from the jpeg headers */
+#define XMD_H
+#undef FAR
+#endif
+
+extern "C" {
+#include <jpeglib.h>
+}
+
+class RGBConverter {
+public:
+    virtual ~RGBConverter() {}
+    virtual void convert(uint8_t* src, uint8_t* dest, int width) = 0;
+};
+
+class RGBToBGRConverter : public RGBConverter {
+public:
+    void convert(uint8_t* src, uint8_t* dest, int width)
+    {
+        for (int x = 0; x < width; x++) {
+            *dest++ = src[2];
+            *dest++ = src[1];
+            *dest++ = src[0];
+            src += 3;
+        }
+    }
+};
+
+class RGBToBGRXConverter : public RGBConverter {
+public:
+    void convert(uint8_t* src, uint8_t* dest, int width)
+    {
+        for (int x = 0; x < width; x++) {
+            *dest++ = src[2];
+            *dest++ = src[1];
+            *dest++ = src[0];
+            *dest++ = 0;
+            src += 3;
+        }
+    }
+};
+
+class JpegDecoder : public SpiceJpegDecoder {
+public:
+    JpegDecoder();
+    ~JpegDecoder();
+
+    void begin_decode(uint8_t* data, int data_size, int& out_width, int& out_height);
+    /* format is SPICE_BITMAP_FMT_<X> for the dest; currently, only
+       x=32BIT and x=24BIT are supported */
+    void decode(uint8_t* dest, int stride, int format);
+
+private:
+    struct jpeg_decompress_struct _cinfo;
+    struct jpeg_error_mgr _jerr;
+    struct jpeg_source_mgr _jsrc;
+
+    uint8_t* _data;
+    int _data_size;
+    int _width;
+    int _height;
+
+    RGBToBGRConverter _rgb2bgr;
+    RGBToBGRXConverter _rgb2bgrx;
+};
+#endif
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