Long live QColorSpace and friends

Adds QColorSpace and QColorTransform classes,
and parsing of a common subset of ICC profiles
found in images, and also parses the ICC profiles
in PNG and JPEGs.

For backwards compatibility no automatic color
handling is done by this patch.

[ChangeLog][QtGui] A QColorSpace class has been added,
and color spaces are now parsed from PNG and JPEG images.
No automatic color space conversion is done however, and
applications must request it.

Change-Id: Ic09935f84640a716467fa3a9ed1e73c02daf3675
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/plugins/imageformats/jpeg/qjpeghandler.cpp b/src/plugins/imageformats/jpeg/qjpeghandler.cpp
index 54fe857908..9d5ccc8a3d 100644
--- a/src/plugins/imageformats/jpeg/qjpeghandler.cpp
+++ b/src/plugins/imageformats/jpeg/qjpeghandler.cpp
@@ -40,10 +40,14 @@
 #include "qjpeghandler_p.h"
 
 #include <qimage.h>
+#include <qcolorspace.h>
+#include <qcolortransform.h>
+#include <qdebug.h>
 #include <qvariant.h>
 #include <qvector.h>
 #include <qbuffer.h>
 #include <qmath.h>
+#include <private/qicc_p.h>
 #include <private/qsimd_p.h>
 #include <private/qimage_p.h>   // for qt_getImageText
 
@@ -725,6 +729,7 @@ public:
     QRect clipRect;
     QString description;
     QStringList readTexts;
+    QByteArray iccProfile;
 
     struct jpeg_decompress_struct info;
     struct my_jpeg_source_mgr * iod_src;
@@ -887,6 +892,7 @@ bool QJpegHandlerPrivate::readJpegHeader(QIODevice *device)
         if (!setjmp(err.setjmp_buffer)) {
             jpeg_save_markers(&info, JPEG_COM, 0xFFFF);
             jpeg_save_markers(&info, JPEG_APP0 + 1, 0xFFFF); // Exif uses APP1 marker
+            jpeg_save_markers(&info, JPEG_APP0 + 2, 0xFFFF); // ICC uses APP2 marker
 
             (void) jpeg_read_header(&info, TRUE);
 
@@ -919,6 +925,10 @@ bool QJpegHandlerPrivate::readJpegHeader(QIODevice *device)
                     readTexts.append(value);
                 } else if (marker->marker == JPEG_APP0 + 1) {
                     exifData.append((const char*)marker->data, marker->data_length);
+                } else if (marker->marker == JPEG_APP0 + 2) {
+                    if (marker->data_length > 128 + 4 + 14 && strcmp((const char *)marker->data, "ICC_PROFILE") == 0) {
+                        iccProfile.append((const char*)marker->data + 14, marker->data_length - 14);
+                    }
                 }
             }
 
@@ -954,6 +964,9 @@ bool QJpegHandlerPrivate::read(QImage *image)
             for (int i = 0; i < readTexts.size()-1; i+=2)
                 image->setText(readTexts.at(i), readTexts.at(i+1));
 
+            if (!iccProfile.isEmpty())
+                image->setColorSpace(QColorSpace::fromIccProfile(iccProfile));
+
             state = ReadingEnd;
             return true;
         }
@@ -962,7 +975,6 @@ bool QJpegHandlerPrivate::read(QImage *image)
     }
 
     return false;
-
 }
 
 Q_GUI_EXPORT void QT_FASTCALL qt_convert_rgb888_to_rgb32_neon(quint32 *dst, const uchar *src, int len);