webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 145 insertions, 0 deletions

diff --git a/Source/WebCore/platform/image-encoders/JPEGImageEncoder.cpp b/Source/WebCore/platform/image-encoders/JPEGImageEncoder.cpp
new file mode 100644
index 000000000..057e0331d
--- /dev/null
+++ b/Source/WebCore/platform/image-encoders/JPEGImageEncoder.cpp
@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2009 Torch Mobile, Inc. All rights reserved.
+ * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ */
+
+
+#include "config.h"
+#include "JPEGImageEncoder.h"
+
+#include "IntSize.h"
+// FIXME: jpeglib.h requires stdio.h to be included first for FILE
+#include <stdio.h>
+#include <jpeglib.h>
+#include <setjmp.h>
+
+namespace WebCore {
+
+class JPEGDestinationManager : public jpeg_destination_mgr {
+public:
+    explicit JPEGDestinationManager(Vector<char>& toDump)
+        : m_dump(toDump)
+    {
+        // Zero base class memory.
+        jpeg_destination_mgr* base = this;
+        memset(base, 0, sizeof(jpeg_destination_mgr));
+    }
+    Vector<char> m_buffer;
+    Vector<char>& m_dump;
+};
+
+class JPEGCompressErrorMgr : public jpeg_error_mgr {
+public:
+    JPEGCompressErrorMgr()
+    {
+        // Zero memory
+        memset(this, 0, sizeof(JPEGCompressErrorMgr));
+    }
+
+    jmp_buf m_setjmpBuffer;
+};
+
+static void jpegInitializeDestination(j_compress_ptr compressData)
+{
+    JPEGDestinationManager* dest = static_cast<JPEGDestinationManager*>(compressData->dest);
+    dest->m_buffer.resize(4096);
+    dest->next_output_byte = reinterpret_cast<JOCTET*>(dest->m_buffer.data());
+    dest->free_in_buffer = dest->m_buffer.size();
+}
+
+static boolean jpegEmptyOutputBuffer(j_compress_ptr compressData)
+{
+    JPEGDestinationManager* dest = static_cast<JPEGDestinationManager*>(compressData->dest);
+    dest->m_dump.append(dest->m_buffer.data(), dest->m_buffer.size());
+    dest->next_output_byte  = reinterpret_cast<JOCTET*>(dest->m_buffer.data());
+    dest->free_in_buffer    = dest->m_buffer.size();
+    return TRUE;
+}
+
+static void jpegTerminateDestination(j_compress_ptr compressData)
+{
+    JPEGDestinationManager* dest = static_cast<JPEGDestinationManager*>(compressData->dest);
+    dest->m_dump.append(dest->m_buffer.data(), dest->m_buffer.size() - dest->free_in_buffer);
+}
+
+static void jpegErrorExit(j_common_ptr compressData)
+{
+    JPEGCompressErrorMgr* err = static_cast<JPEGCompressErrorMgr*>(compressData->err);
+    longjmp(err->m_setjmpBuffer, -1);
+}
+
+bool compressRGBABigEndianToJPEG(unsigned char* rgbaBigEndianData, const IntSize& size, Vector<char>& jpegData, std::optional<double> quality)
+{
+    struct jpeg_compress_struct compressData;
+    JPEGCompressErrorMgr err;
+    compressData.err = jpeg_std_error(&err);
+    err.error_exit = jpegErrorExit;
+
+    jpeg_create_compress(&compressData);
+
+    JPEGDestinationManager dest(jpegData);
+    compressData.dest = &dest;
+    dest.init_destination = jpegInitializeDestination;
+    dest.empty_output_buffer = jpegEmptyOutputBuffer;
+    dest.term_destination = jpegTerminateDestination;
+
+    compressData.image_width = size.width();
+    compressData.image_height = size.height();
+    compressData.input_components = 3;
+    compressData.in_color_space = JCS_RGB;
+    jpeg_set_defaults(&compressData);
+    int compressionQuality = 65;
+
+    if (quality && *quality >= 0.0 && *quality <= 1.0)
+        compressionQuality = static_cast<int>(*quality * 100 + 0.5);
+
+    jpeg_set_quality(&compressData, compressionQuality, TRUE);
+
+    // rowBuffer must be defined here so that its destructor is always called even when "setjmp" catches an error.
+    Vector<JSAMPLE, 600 * 3> rowBuffer;
+
+    if (setjmp(err.m_setjmpBuffer)) {
+        jpeg_destroy_compress(&compressData);
+        return false;
+    }
+
+    jpeg_start_compress(&compressData, TRUE);
+    rowBuffer.resize(compressData.image_width * 3);
+
+    // add offset to prevent clobbered error caused by setjmp and longjmp.
+    unsigned offset = 0;
+    const unsigned char* pixel = rgbaBigEndianData;
+    const unsigned char* pixelEnd = pixel + compressData.image_width * compressData.image_height * 4;
+    while (pixel + offset < pixelEnd) {
+        JSAMPLE* output = rowBuffer.data();
+        for (const unsigned char* rowEnd = pixel + offset + compressData.image_width * 4; pixel + offset < rowEnd;) {
+            *output++ = static_cast<JSAMPLE>(*(pixel + offset++) & 0xFF); // red
+            *output++ = static_cast<JSAMPLE>(*(pixel + offset++) & 0xFF); // green
+            *output++ = static_cast<JSAMPLE>(*(pixel + offset++) & 0xFF); // blue
+            ++offset; // skip alpha
+        }
+        output = rowBuffer.data();
+        jpeg_write_scanlines(&compressData, &output, 1);
+    }
+
+    jpeg_finish_compress(&compressData);
+    jpeg_destroy_compress(&compressData);
+    return true;
+}
+
+} // namespace WebCore