JBPatch

[mergen3107]

Originally Posted by Elendiar

Can someone give additional info what to edit to fix this ?

I just left default smallest value as my new largest one. I use it only when skimming.
My values are (PW3): 16.98 7.55 5.00

[Barty]

Originally Posted by mergen3107

I confirm working margins methods as described by stripe7.
KPW3, 5.9.7, English US.
I modified though not ReaderSDK-impl-en_GB.jar, but just ReaderSDK-impl.jar (which is default for English US).
I put 16.98, 11.32 and 7.55 for three types of margins.
7.55 for top/bottom/progressbar stuff.

One thing I don't understand with MOBI font sizes.
In Mobi-drawing.jar there are 8 font sizes listed, but the reader has a choice of 14. Plus it seems like the font size around 29 is the maximum 14th one, not 8th.
Font size 29 in MOBI is about the same size (visually) as the 14th one in KF8.

Spoiler:

Default FONT_RAMP values for KF8: 6.96 7.92 8.4 9.36 10.56 11.52 12.48 13.92 15.36 17.04 19.20 22.08 25.2 29.28

Default values for MOBI: 7.13 ; 7.81 ; 8.49 ; 9.17 ; 10.53 ; 12.56 ; 16.98 ; 29.2

Where are other 6 sizes?

On 5.9.7, the first 5 sizes for 300dpi are identical for mobi and azw3. Then it goes like this

Mobi azw3

6 7
7 9
8 14

I think the other in between values are interpolated. They couldn't bother with mobi, I guess.

[mergen3107]

@Barty,
Thank you!

I'll try them then.

UPDATE

@Barty, thank you again!
I put the appropriate values of KF8 (which all were initially chosen manually) into MOBI font sizes like this:
##1-5 identical
#6 = #7
#7 = #10
#8 = #14

Exact values are:

Spoiler:

#1   #2   #3   #4   #5    #6    #7    #8    #9    #10   #11   #12   #13   #14
8.42 8.84 9.26 9.68 10.10 10.52 10.94 11.36 11.78 12.20 12.62 13.04 13.46 13.88 (new KF8)

#1   #2   #3   #4   #5    #6    #7    #8    #9    #10   #11   #12   #13   #14
8.42 8.84 9.26 9.68 10.10 10.51 10.94 11.35 11.77 12.20 12.60 13.02 13.44 13.88 (new mobi)

It looks like there are some differences still, due to interpolation factors, but it is only about 0.02.

Yes, dictionary font size jumped to #3 = 9.26, which is larger than 8.49 by about 9%, but that's still fine.

[mergen3107]

Does anybody know how can we change fonts for kfx files?
After my alterations for mobi7 and kf8 above, downloaded books from Amazon look like they have default set of font sizes.

[shamanNS]

Someone with actual Java skills could probably do it. Most likely place to look at would be "YJReader-impl.jar" file and inside that there is a class "YJBookController.class".

It contains references to "font.size.mapping" inside method named "axO":

...

private boolean debug = false;
private static final String aQi = "/mnt/us/CONTENT_FONT_RAMP";

...

public float[] axO() {
        float[] arrf;
        if (this.debug && (arrf = ReaderUtils.E((String)aQi, (int)this.mE().length)) != null && arrf.length > 0) {
            return arrf;
        }
        return (float[])ResourceBundle.getBundle(jb).getObject("font.size.mapping");
    }

The code is from firmware 5.9.7 for PW3.

As far as I've managed to understand the code if a field/member variable named "debug" wasn't set to "false" Kindle users would be able to re-define font sizes used for KFX books by creating a text file at "/mnt/us/CONTENT_FONT_RAMP" in the same way we can re-define font sizes for KF8 books by using "/mnt/us/FONT_RAMP".


So a Java & Java ByteCode guy that is well versed in decompiling & recompiling code would probably just need to "toggle" that "debug" variable value to enable parsing of "CONTENT_FONT_RAMP" file.



---------------------
EDIT: OK, I've just tested it an confirmed that it is working as expected.

So, the only thing that needs to be changed is line 15 of init method of "YJBookController.class"

before change:

iconst_0
putfield com/amazon/ebook/booklet/yjreader/impl/YJBookController/debug Z

after change:

iconst_1
putfield com/amazon/ebook/booklet/yjreader/impl/YJBookController/debug Z

Then just create "CONTENT_FONT_RAMP" with the same type of content (14 decimal/float type numbers) that you would use (or were already using, like I was) in "FONT_RAMP", reboot Kindle and it should work.

I noticed that KFX book will have slightly smaller font sizes for the same values... am to lazy to check if it because of the difference in "base font size" between two books or just Kindle using different "scaling" for those 2 book formats (KFX and KF8/AZW3).

[PoP]

Originally Posted by PoP

Reasonable. Not holding my breath, I did...*write to amazon*...

In the mean time, inspired by

Originally Posted by shamanNS

Someone with actual Java skills could probably do it. Most likely place to look at would be "YJReader-impl.jar" file and inside that there is a class "YJBookController.class".

It contains references to "font.size.mapping" inside method named "axO":

...


The code is from firmware 5.9.7 for PW3.

...

So, the only thing that needs to be changed is line 15 of init method of "YJBookController.class"

before change:

iconst_0
putfield com/amazon/ebook/booklet/yjreader/impl/YJBookController/debug Z

after change:

iconst_1
putfield com/amazon/ebook/booklet/yjreader/impl/YJBookController/debug Z

...

I patched my PW3 5.10.3 similarly:

In this firmware version, references to "font.size.mapping" are inside method named "ayT"

Spoiler:

and the changes have to be made in method named init at line 27

Spoiler:

Now,
/mnt/us/CONTENT_FONT_RAMP
/mnt/us/CONTENT_CJK_FONT_RAMP
/mnt/us/CONTENT_INDIC_FONT_RAMP
properly trigger size overrides in KFX ebooks

[shamanNS]

Yeah, they re-obfuscate Java code with every (non bugfix??) firmware update so the name of the method that parses that txt file changes but so far that variable is still named "debug", at least since 5.9.x up to the latest firmware.

Did you also notice the difference in text size between KF8 and KFX books? For KFX text is smaller...

[PoP]

Originally Posted by shamanNS

...
Did you also notice the difference in text size between KF8 and KFX books? For KFX text is smaller...

Yes I did, but could not locate where/why that happens in the java code.

Following screenshots show differences in the AZW3 and KFX formats of the Kindle User's Guide, with default behaviour and with overrides for sizes 1, 8, and 14:


Default behaviour:


With FONT-RAMP and CONTENT_FONT-RAMP overrides

7.33 8.00 8.33 8.67 9.00 9.33 9.67 10.00 10.33 10.67 11.00 11.33 11.67 12.00

Overriden behaviour:

[jhowell]

Originally Posted by PoP

Following screenshots show differences in the AZW3 and KFX formats of the Kindle User's Guide, with default behaviour and with overrides for sizes 1, 8, and 14:

I looked at the first pair (size 1) in each group (default/overrridden) using an image editor and verified that the font size of the body text is identical in the AZW3 and KFX images. There are differences are in inter-character spacing, but that is expected with enhanced typesetting.

The font size of the headings are obviously different between the AZW3 and KFX version. I believe that it is likely an artifact of KFX conversion. It tends to reduce excessive font size variations and vertical spacing.

[j.p.s]

I have no plans to read KFX books, but the collaboration in this thread is inspiring.

[PoP]

^ @jhowell Yeah, you nailed it

[kleinjar]

Originally Posted by mergen3107

I confirm working margins methods as described by stripe7.
KPW3, 5.9.7, English US.
I modified though not ReaderSDK-impl-en_GB.jar, but just ReaderSDK-impl.jar (which is default for English US).
I put 16.98, 11.32 and 7.55 for three types of margins.
7.55 for top/bottom/progressbar stuff.

Do the new margins persist even when you exit a book, or do they keep reverting to the stock margins like described in post 1834?

[mergen3107]

Originally Posted by kleinjar

Do the new margins persist even when you exit a book

Yes! The margins changed permanently.

[trcm]

I just changed the margins (ReaderSDK-impl-en_GB.jar) on my PW4 running 5.11.1, using a neat Java tool called Recaf.

For my firmware level, font.wordsperline.margin.list appears at line 5817, and I used values of 16.9811, 11.8868, 6.7925 (the same as per font.wordsperline.margin.list.pdf).

Most of my books are KFX format, and the changes above are effective on page turn, but reset to the wide Kindle defaults if I exit and enter the book. So I set a custom theme, and have to choose that each time I open a book.

Is there something I missed to have this working as default?

NB: Also have the issue where text is chopped at the edges in 'Goto / Page Flip' previews. Perhaps one of these settings could help :

goto.menu.input.panel.size
goto.menu.label.border
goto.menu.label.font
goto.menu.panel.border
goto.menu.panel.guide.size
goto.menu.panel.size
goto.menu.toc.text

[mergen3107]

@trcm,

thank you for your insights about page flip!
However, I didn't succeed.
Here is what I've learned and tried:

Spoiler:

property - default values (equivalent in cm for PW3, 300 ppi, measured by ruler) - description

goto.menu.panel.size 156.23 196.98 (5.5 6.9 cm) pageflip text width, and pageflip window width
goto.menu.panel.guide.size 203.77 237.74 (7.1 8.3 cm) toc width of thin line between chapters, and toc window width

goto.menu.input.panel.size 224.15 122.26 (7.9 4.4 cm) width and height of the 'enter page or location' window
goto.menu.toc.text "Table of Contents..."
goto.menu.label.font "Serif"

I tried to change the first two quantity pairs, but after framework restart or Settings-Restart the page flip window size or text size within it didn't change.

Any ideas?