| Description | Branch/Commit | Created on | Landed in | Landed Date
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| What is left is ARM neon code for the porter duff operations. | | |
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ARM optimized qdrawhelper is only enabled for RCVT (symbian) A pure armv4/C implementation was used giving a significant improvement too. The ARMv4 memfill implementation gave about a 1fps improvement. | memfill | 9.11.09 | |
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| The C version comp_func_SourceOver was improved giving a 10fps improvement on the test case. | a69e1 7f379c | 09.11.2009 | |
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ARMv6 should be auto detected. Currently arm/armv6 can be passed as -embedded options. The benefit of ARMv6 in src/corelib is the use of atomic load and exchange, instead of the old "swap" extension. __ARCH_ARM_6__ should be used to detect it. The first part of ARM detection was done | 50b67 | 9.11.2009 | |
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| Enabled pld (preload) in qdrawhelper for ARMv5te and upwards -- For GNU CC the arm revision is detected automatically and this gave a 1fps improvement. | b2d17d | 9.11.2009 | |
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| Optimize scrolling of Windowsurfaces. Either optimize memcpy/memmove or consider using a tile based window surface | | | |
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| QImageReader deserves some optimatations. E.g. decode to the QImage provided to the decoder, do not parse every gif when trying to determine the size. | image-changes | | |
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| Cut down on usage of QImage::scanLine inside Qt. This was already done in the GIF and PNG decoder. | image-changes | 19.10.2009 | |
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| Make QGifHandler::imageCount scan through the images. This can give a 5% speedup in the image_cycling reduction. | | | |
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| Make picking a QImageIOHandler in QImageReader faster. Currently even the TIFF plugin is asked to handle images. | | | |
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| Consider creating a tile based QImage to allocate image chunks from an image pool with fixed size images | | | |
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| Bring zero-copy to QIODevice... big one. That is good for networking and image decoding. | | | |
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| Consider creating a SharedBuffer that works on tiles/segments | | | |
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| Changes to QHttpNetworkReply to reduce memory reallocations. Reserve some bytes instead of doing QByteArray::append all them time. | | | |
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| Changes to QNetworkReply to remove quadratic runtime in QNetworkReplyHandler and latency fixes | network-changes | 19.10.2009 | API addition |
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| Cut down on the usage of QUrl::toEncoded as it shows up in the profile of starting jobs. | | | |
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| QBENCHMARK results are hard to analyze and compare. We need a single and simple way to say if something is faster or slower. Be a bit like sunpsider, do the same math as well, mention slowest and fastest run. | | | |
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| The qttracereplay utility should decode a frame at a time to not run out of memory on embedded devices. | | | |
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| The qttracereplac utility should take a -iterations options like known from QBENCHMARK | | | |
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| Bug | Description | Commit | Date
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| Loading of http://en.wikipedia.org/wiki/Maxwell_equations is triggering bad "scheduling". The loading_standalone test has been extracted but is not able to highlight the problem. This is a Qt and QtWebKit issue, it must be understood first. |
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| TCmalloc needs to be tested. Does it make anything faster/slower? How to test memory fragmentation. |
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| The fuzz testing will make QtWebKit go in infinite loops and stop working. This situation needs to be analyzed as this can be a serve reliabality problem. |
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| #30211 | Research a better QImage -> QPixmap migration strategy. Currently we convert every QImage to a QPixmap and this is bad for times where we need to draw a scaled version of the image or will only draw this image once. |
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| #30293 | Loading speed regressed due image changes? |
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| #30301 | Loading bug/API bug on loading amazon in QtEmbedded Linux. Loading does not complete. |
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| #29279 | Decode images to RGB16 or smaller (instead of RGB32) to conserve memory. The patch introduces new API to Qt. |
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| Go through the Palm changes and consider adopting them. Currently candidates are: Use stack/class memory in CSSParser, use JDCT_Fast for Jpeg decoding (to be achieved with QImageReader to set quality to 49), changes to Cached* to throw away encoded data more early. Palm avoids floating point operation on premultiplied alpha in setRGBA. |
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| #30740 | Using QImageReader::setQuality(49) will use JDCT_IFAST and promises to give a 5% speedup on image_cycling. |
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| #30210 | Create Embedded profile that will tune for embedded usage. This can mean to save memory in favor of speed, add a speed gain by avoiding certain operations, trading image quality for speed |
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| #29443 | Using WebCore's FontCache decreases memory usage. Change done by Benjamin Poulain |
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| #31009 | Implement throwing away frames from big GIF animations. This requires QImageReader allow to efficently jumping to a given image. |
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Change CursorQt.cpp to not create QPixmap's right away but only on first load. This will be a minor memory improvement. Using DEFINE_LOCAL_STATIC had a negative impact on memory usage. |
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#27538 | Image decoder changes needs to be measured. Do they make anything faster/slower? Do they consume more or less memory? | 49179 49180 49181 49182 49183 49185 49186 49559 | 6.10.2009-14.10.2009
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#30769 | Export fastMalloc, fastCalloc, fastRealloc and fastFree on GCC/Unix | 50204 50205 | 28.10.2009
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| Misc Changes
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#30209 | Document a feature of the m_liveDecderResources list | 50213 | 28.10.2009
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#27347 | Fix assertion in SVGRenderBase::mapLocalToContainer | 50207 | 28.10.2009
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#30820 | Custom Cursor doesn't use hotspot | 50206 | 28.10.2009
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