Re: 回复： About freetype2 bitmap strik e

I see, the incomplete code is your intention, and you don't want to make a self-standing test program.

Taking a look on your source, I guess your intent of the code would be:
1) set the 4th bitmap strike, by calling "FT_Select_Size(face, 4)".
2) load a bitmap glyph for U+00A4 (currency sign, "¤"), by calling "__draw_ft_char(0, 0, 0x00A4, &height, &width);"
3) load a bitmap glyph for U+0041 (latin capital letter A, "A"), by calling "__draw_ft_char(0, 0, 0x0041, &height, &width);

1) & 2) works successfully, but 3) fails. And you think 3) is a bug (or something to be improved) of FreeType2.

--

I don't think SimSun includes a bitmap data for "A" (U+0041).

What you see in FontForge window for "A" is not an embedded bitmap, but a runtime-generated bitmap calculated by FontForge, on the fly. Maybe, when you open the file and select a bitmap strike, the character chart would display red box for U+0041. If you click the red box, fontforge would calculate the bitmap glyph in runtime.

If you dump SimSun by fonttools by Just van Rossum, https://github.com/fonttools/fonttools ,
you can find an XML element for the embedded bitmap for "currency" (U+00A4), like,

       <ebdt_bitmap_format_1 name="currency">
         <SmallGlyphMetrics>
           <height value="9"/>
           <width value="9"/>
           <BearingX value="1"/>
           <BearingY value="9"/>
           <Advance value="12"/>
         </SmallGlyphMetrics>
         <rawimagedata>
           80805d00 22004100 41004100 22005d00
           8080
         </rawimagedata>
       </ebdt_bitmap_format_1>

But there is no an XML element for the embedded bitmap for "A" (U+0041). You would NOT find an XML element like
       <ebdt_bitmap_format_1 name="A">
       ...
       </ebdt_bitmap_format_1>
There is no such. So SimSun does not bitmap data for "A".

You should understand that some glyphs in a font may have both of outline and bitmap data, but other glyphs in same font may have outline only, or, bitmap only.

Regards,
mpsuzuki

On 2024/12/06 0:04, 大牙开心就好 wrote:
> Hi,
> 
> test.c is a part of my test code about freetype2, which is indeed incomplete, but could you put the functions in test.c into your project and run the test function.
> 
> 1.Call the test() function in your project's mian() function.
> 2.ff_convert() can be commented out and ignored.
> 3._T() depends on whether the string used by the file system is utf-16 or utf-8.
> 
> I have fully supplemented test.c
> 
> Thank you！
> _T() depends on whether the string used by the file system is utf-16 or utf-8
> ________________________________
> <https://wx.mail.qq.com/home/index?t=readmail_businesscard_midpage&nocheck=true&name=%E5%A4%A7%E7%89%99%E5%BC%80%E5%BF%83%E5%B0%B1%E5%A5%BD&icon=https%3A%2F%2Fres.mail.qq.com%2Fzh_CN%2Fhtmledition%2Fimages%2Frss%2Fmale.gif%3Frand%3D1617349242&mail=990087812%40qq.com&code=>
> [https://res.mail.qq.com/zh_CN/htmledition/images/rss/male.gif?rand=1617349242]
> 大牙开心就好
> [email protected]
> 
> 
> 
> ------------------ 原始邮件 ------------------
> 发件人: "suzuki toshiya" <[email protected]>;
> 发送时间: 2024年12月5日(星期四) 晚上10:39
> 收件人: "freetype"<[email protected]>;
> 抄送: "大牙开心就好"<[email protected]>;
> 主题: Re: 回复： About freetype2 bitmap strike
> 
> I'm unsure whether this is really the code that you tested.
> Attached test.c is not buildable, because of following problems.
> 
> 1) test.c has no main() function.
> 
> 2) test.c includes no header files. no freetype header file, no standard C header file (like stdint.h to use uint16_t)
> 
> 3) test.c is not self-standing code, it calls some external functions or macros. _T(), ff_convert() are not defined.
> 
> Regards,
> mpsuzuki
> 
> On 2024/12/05 15:02, 大牙开心就好 wrote:
>> Hi,
>>
>> The attachment contains the test code and font.
>>
>> test result：
>> [https://mail.qq.com/cgi-bin/viewfile?f=0C30B02BD5A828EE573EEE1B2A7B2299C21365D1FC48CD6EB08B080841116823DD236A8D7AAECFDE201B9EFA152076E4F79A612F8E0F55779029CF61F0E82AE30CFBB714D0C45DF7FFBB6C91810768F213B994676C239C7253CDD6CF4B0F2E24&mailid=ZL0105-%7EHziUtiZLC9%7EHiVCO9t%7EDec&sid=X9tNkBof7u28NA9o&net=1069200670]
>>
>> I don't know if this is a bug or some other reason, I hope to get your help,Thank you.
>>
>> ________________________________
>> <https://wx.mail.qq.com/home/index?t=readmail_businesscard_midpage&nocheck=true&name=%E5%A4%A7%E7%89%99%E5%BC%80%E5%BF%83%E5%B0%B1%E5%A5%BD&icon=https%3A%2F%2Fres.mail.qq.com%2Fzh_CN%2Fhtmledition%2Fimages%2Frss%2Fmale.gif%3Frand%3D1617349242&mail=990087812%40qq.com&code=>
>> [https://res.mail.qq.com/zh_CN/htmledition/images/rss/male.gif?rand=1617349242]
>> 大牙开心就好
>> [email protected]
>>
>>
>>
>> ------------------ 原始邮件 ------------------
>> 发件人: "[email protected]" <[email protected]>;
>> 发送时间: 2024年12月5日(星期四) 中午1:25
>> 收件人: "freetype"<[email protected]>;
>> 抄送: "大牙开心就好"<[email protected]>;
>> 主题: Re: About freetype2 bitmap strike
>>
>> Hi,
>>
>> Could you post your testing code written in C?
>> (please do not copy & paste it in your HTML email, please post as an attachment)
>>
>> Regards,
>> mpsuzuki
>>
>> P.S.
>> I hope you can reply to [email protected].
>> If you reply to me privately with no explanation why it is private, I will post it to the public list.
>> Thanks in advance!
>>
>> On 2024/12/05 12:38, 大牙开心就好 via FreeType users wrote:
>>> Hi:
>>> &nbsp; &nbsp; I use freetype2 to retrieve the bitmap data embedded in the font, Using FT_LOAD_SBIS_ONLY.
>>> In the "simsun.ttf" font, some characters can be obtained while others cannot.
>>> Use "FontForge" software to view that these characters all contain bitmap data.
>>>
>>>
>>> for example:
>>> &nbsp; &nbsp; characters "¤", its Unicode is 0x00A4，The bitmap data obtained using freetype2 is consistent with the bitmap data viewed using FontForge software.
>>> As shown in the following figure.
>>>
>>> &nbsp; &nbsp;
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> &nbsp; &nbsp; But, characters "A", its Unicode is 0x0041，Freetype2 cannot obtain bitmap data. But using FontForge software, it can be seen that there is bitmap data.
>>>
>>> As shown in the following figure.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> My test code：
>>>
>>> int ft_error;
>>>
>>> FT_Select_Size(face, 4);
>>>
>>> ft_error = FT_Load_Char(face, 0x00A4, FT_LOAD_RENDER | FT_LOAD_SBITS_ONLY | FT_LOAD_MONOCHROME);
>>>
>>> ft_error is 0;
>>>
>>> &nbsp;
>>>
>>> ft_error = FT_Load_Char(face, 0x0041, FT_LOAD_RENDER | FT_LOAD_SBITS_ONLY | FT_LOAD_MONOCHROME);
>>>
>>> ft_error is 6;
>>>
>>>
>>>
>>>
>>> &nbsp; &nbsp; I found that the error occurred in tt_stit_decoder_load_image function and returns NoBitmap.
>>>
>>> But use "FontForge" software open the "simsun.ttf" and view characters "A",We can see that it has bitmap data.
>>>
>>> I don't know if this is a bug or some other reason, I hope to get your help,Thank you.
>>>
>>>
>>>
>>>
>>> My freetype2 version is V2.13.0, and the attachment is the "simsun. ttf" font.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> 大牙开心就好
>>> [email protected]
>>>
>>>
>>>
>>> &nbsp;