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A few days passed since my first post about issues relating image quality and memory consumption in X Buy female pink viagra without prescription, . I gathered a few people here at Révolution Linux to do some QA on my builds integrating my Mozilla framework modifications, female pink viagra in australia. Overnight female pink viagra, Unfortunately, it seemed like intensive browsing and image viewing of scaled images led to some issues with my previous patches, order female pink viagra no prescription required. Buy discount female pink viagra, One of these was caused by interlaced images which wouldn't completely render. This was actually a bug in a Thebes function which would tell me that an image had done being uncompressed while that wasn't the case, discount female pink viagra no rx. To support interlaced images, a new flag was added to indicate that an image had not completed its several decompression passes, buy female pink viagra without prescription. Female pink viagra cheap, Next, there was a very light glitch when scrolling in upscaled images, female pink viagra no online prescription. Female pink viagra sales, This was caused by how I implemented scaling and memory usage reduction. I was creating subimages first and then scaling these to fit their destination rectangle, order female pink viagra on internet. Buying female pink viagra, I now proceed with scaling before selecting subimages.

As my update section Buy female pink viagra without prescription, was explaining, I give users more flexibility of when to manipulate images and use GDK's bilinear interpolation to increase image quality or when to limit memory usage by a single preference variable.

Finally, female pink viagra non prescription, Order female pink viagra from us, this new patch should be considered the final version for bug 395260. It also could be considered a first step toward 372462 resolution, female pink viagra vendors. Buy female pink viagra overnight delivery, Joe is currently refactoring the whole nsThebesImage code for the Gecko 1.9.1 release and I would expect him to port my GDK manipulations to its future code.

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Buy viagra without prescription, The lastest Firefox release, version 3.0, relays on the Gecko as a layout engine and libpr0n for image decompression. The underlying Cairo framework greatly improves the code portability and increases the rendering on supported platforms, buy viagra generic. Buy viagra without prescription, Cairo is used in several projects and sounds very promising with the eventual support of glitz to benefit of 3d hardware acceleration.Thebes is the C++ code used to wrap the Cairo framework in Mozilla. It uses ImageSurfaces which get decompressed image data from libpr0n, cheap viagra from uk. Viagra price, The current design of these surfaces is to send a full pixmap (decompressed images) to X without any limitation. Then, the underlying Cairo surfaces can be painted and the Mozilla application's memory freed, buy viagra without prescription. The actual image data is kept as a pixmap in X's memory, cheap viagra tablets. Viagra us, This choice of storing the pixmaps in X instead of in the application's memory can increase the performances when rendering image: the new visible data does not need to transfered on every scrolling event.

On the other hand, viagra india, Order viagra overnight delivery, storing pixmaps in X might not be the best solution to optimize the speed of image rendering. Considering that the full pixmap needs to be transfered between the application and X, order generic viagra, Buy viagra in canada, rendering the first visible frame will be slower. Buy viagra without prescription, Also, using unlimited memory in X may steal the available ressources for other applications.

Firefox has a long history of known bugs related to pixmap storage in X, buy cheapest viagra online. Drug viagra online purchase, I've focused on bugs 296818 and 395260 during the last weeks with the unique goal of changing way Mozilla handles pixmaps. The most affected users of pixmap storage are those who use Firefox on thin clients, viagra prescription. Cheapest viagra price, These usually have low available memory and can't be used to store pixmaps. This simple page on a 128 Mbs RAM thin clients takes a while to load a few images and then causes a quick OOM kill before page rendering ends, buy viagra without prescription. One might say that showing multiple 5000x1220 images resized to 50x50 might not be common on the web but isn't the web full of bad html coders, viagra no prescription. Viagra generic, Frederico Mena Quintero has been very concerned about this behavior and integrated some modifications in Firefox to increase the quality of pixmap management. The infamous MOZ_DISABLE_IMAGE_OPTIMIZE environment variable has also been integrated in Mozilla's sources to reduce memory used by pixmap in X, purchase viagra overnight delivery. Buy viagra from canada, Unfortunately, none of the integrated patches changes the behavior whitout any quality issue in the overall browing experience, cheap viagra no prescription. Buy viagra without prescription, While comparing Firefox to Opera and Konqueror, I noticed that only Opera seemed to effectively manage it's memory and pixmap caching. Viagra internet, These graphics roughly represent both application memory and X memory when rendering this simple test page.






















X Memory App Memory
Firefox 3.0
Opera 9.27
Konqueror 3.5.9

Note : these graphics have been generated using these basic homemade scripts to give an overview of the total memory usage, purchase viagra no rx. Cheap viagra overnight delivery, The y scale represents the memory usage in bytes while the x scale is the sample number. appmem.py - memx.py (generate application data with appmem.sh)

From these graphics, viagra rx, Approved viagra pharmacy, we can conclude that there's is a clear possibility to optimize memory consumption by pre-manipulating images before we send them to X. At least, this is what Opera seems to do and that this results in better memory management, buy viagra without prescription. Why wouldn't Mozilla applications keep the uncompressed image data locally instead of pushing it to X, canadian pharmacy viagra. Viagra online sale, There are actually two situations to take into consideration to achieve memory optimization. First, viagra discount, Viagra online without prescription, Mozilla should send only visible portions of images to X, this forces to recompute the visible portion on every user operation, viagra online review, Viagra bangkok, such as scrolling or window resizing, and send the new sub-images to X, discount viagra without prescription. Order viagra, Image scaling also needs to be taken into consideration. Buy viagra without prescription, For example, why would we transfer the full data of a 1920x1200 image to X if it has been resized to 1024x768 . The pixmap would simply be using memory ignored when rendering, best price viagra. Buy viagra online, As the Cairo developer Carl Worth pointed out, the advantage of transferring a full pixmap to X and let it resize an image would be to use the rendering extension that could be available in X, find viagra without prescription. Cheap viagra from canada, Doing so still requires to transfer a full pixmap between the X application client and the X server. The transfer itself is very bandwidth consuming when using a remote X connection, buy viagra from us, Viagra in malaysia, even on a 100Mbit network. For example, a 5000x1200 - 24 bits image represents around 46 Mbs of data to transfer and around 4.6 seconds of delay before we can render the first image, buy viagra without prescription. There is probably also an overhead when transferring images using local sockets but this would need to be verified by performing additional tests, viagra buy online. Order viagra in us, At first, I had implemented a basic downscaling algorithm and sub-image creation from an image's original data. Since there are references to the GDK library in Thebes, I took the freedom to use available functions to manipulate raw image data. As this page explains it, GDK uses the RGBA format to represent a GdkPixbuf while Cairo respects the X server's ARGB format. Buy viagra without prescription, On a second thought, this results in the red and blue channel being inverted while manipulating images. There's no reason why this would have consequences on the resulting image. Furthermore, GDK offers flexibility on the algorithms to scale images while the X server uses the nearest-neighbor interpolation algorithm. Hence, the gdk_pixbuf_new_subpixbuf() and gdk_pixbuf_scale_simple() functions offer the quickest way to easily pre-manipulate images in Thebes before the pixmaps are sent to X through the Cairo library. Moreover, the quality of the downscaled images is WAY better when using an algorithm different to the nearest-neighbor interpolation. The difference in Firefox is shown here :

Downscaled images in Firefox 3.0 using X's nearest-neighbor interpolation: (current behavior)

Downscaled images using GDK's bilinear interpolation:

Mozilla's QA team has built the Talos performance testing project to verify that code modifications do not decrease the product quality, buy viagra without prescription.
FF3 built from source output
FF3 patched sources output

Update : After testing the patch in a few environments, I discovered that the scrolling quality could be sluggish when Firefox was used on a thin client with an application server having low resources. My first thought was that the transfer of raw data to the X server added an important overhead to the quickness of rendering but that hasn't been the case in other environments. Since we can assume that a thin client's backend should have the minimum ressources to support mallocs without using the swap area, there should be no visible difference of usage on a thin client. To give users control over image manipulation, I added the "browser.gdk_interpolation_threshold_percent" preference variable that allows values between 1-100 and has for effect to either use or bypass GDK image manipulations. Buy viagra without prescription, The default value is 50% which only affects images being scaled by a factor of 50% or 200% and images with a visible portion under 50%. Lowering this value to it's minimum (1%) would turn the feature off while using 100% will premanipulate any image overflowing it's container. I've generated new Talos reports here run on a thin client. Finally, as Joe from #gfx did mention, I added support for images upscaling with GDK to increase the image quality by also using the bilinear interpolation algorithm. Here is the difference between an original 309x329 px image :
Upscaled image in Firefox 3.0 using X's nearest-neighbor interpolation: (current behavior)

Upscale image using GDK's bilinear interpolation:

Finally, here's the complete patch that I hope will be integrated in Firefox's and included in a future 3.0.x update. It currently only changes the behavior on UNIX systems since the main goal is to reduce memory consumption in X and that I am not aware of that kind of problems for GDI+ or Quartz backends.

diff : x-memory-optimization.diff
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Buy gold viagra without prescription, Here are some pretty straight forward steps to quickly get a development environment based on the Eclipse IDE. The tools in this environment are


Note: Mozilla has great documentation to help building any of their application, gold viagra online without a prescription. Canadian gold viagra, Please have a look there before posting any question. The #developers irc.mozilla.org channel is also a good start, find gold viagra no prescription required. Buy gold viagra in us, This tutorial assumes you're using Ubuntu or a similar distro.

Build and configure Firefox


1, buy gold viagra without prescription. Install required tools and Firefox dependencies
sudo apt-get install cvs distcc eclipse eclipse-cdt libcurl4-openssl-dev distccmon-gnome
sudo apt-get build-dep firefox

2, gold viagra no rx required. Order gold viagra online, Get the Firefox source

TAR :

wget ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/3.0b5/source/firefox-3.0b5-source.tar.bz2
tar -xjf firefox-3.0b5-source.tar

CVS :
export CVSROOT=:pserver:anonymous@cvs-mirror.mozilla.org:/cvsroot
cvs login
cvs -d :pserver:anonymous@cvs-mirror.mozilla.org:/cvsroot co mozilla/client.mk
cd mozilla
make -f client.mk checkout

Note: Mozilla MXR offers a quick web search engine for source code

3. Create the Mozilla config file to build firefox

cd mozilla
echo "mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/../obj-@CONFIG_GUESS@" >> .mozconfig
echo "ac_add_options --enable-application=browser" >> .mozconfig
echo "mk_add_options MOZ_CO_PROJECT=browser" >> .mozconfig
echo "ac_add_options --enable-debug" >> .mozconfig
echo "ac_add_options --disable-optimize" >> .mozconfig
echo "mk_add_options MOZ_MAKE_FLAGS=\"CC='distcc gcc' CXX='distcc g++' -j4\"" >> .mozconfig

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Build Firefox

make -f client.mk build

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File->New->Project.., buy gold viagra without prescription. Cheapest gold viagra, C/C++ Project->Standard Make C++ Project
Project Name: Firefox
Location : (select the extracted mozilla folder)
Click "Finish"

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Right-click on the new Firefox project in Eclipse's left column
Click "Properties"
Select "Make C++ Project"
Change "Build command" to "make -f client.mk"
Change "Build (incremental build)" from "all" to "build"

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You should remove the "Build automatically" option from the Project menu and build the application by right-clicking on the Firefox project and selecting "Build Project"
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This operation always takes a while since all subfolders and files need to be parsed (around 30k files)

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Select Run->Debug... from the Eclipse menu
Right-click on C/C++ Local Application and select New
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C/C++ Application: (select browse and choose mozilla/../obj-i686-pc-linux-gnu/dist/bin/firefox-bin)
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