forums.ps2dev.org

[thomas_fogh]

Does anyone have a JPG tutorial?
Thanks!
BR, Thomas Fogh

[picobsd]

I have some sample code of using libjpeg to display jpeg file

[willow :--)]

I'm a beginner myself but so far here's what I understood :

Basically you load the jpeg in a memory structure, then you display it as a Texture on a 3D structure (like a sprite ?), then you send the 3d structure to the screen.

0) Search the forum, you'll find dozens of (almost working) sample codes for jpeg display

1) there is a good implementation of jpeg loading on luaplayer. Go to
http://svn.ps2dev.org/filedetails.php?repname=pspware&path=%2Ftrunk%2FLuaPlayer%2Fsrc%2Fgraphics.cpp&rev=0&sc=0
and look for Image* loadJpegImage(const char* filename) and
Image* loadJpegImageImpl
(you have to include "graphics.h" that defines the image structure).

2) Then you have to "blit" the image to the screen. for that, look at the "blit.c" sample in the sdk... You'll have to understand the basics of GU if you've never worked on 3D applications

3) You might have some problems between 16 bits (screen) and 24bits(jpeg)... I personnally solved that by changing the screen to 32 bits, but I guess it would be better to convert the image to 16bits...

(I am myself stuck with two problems currently:
- my image's height is bigger than screen's height
- I want to resize my image... I guess that's probably done by changing the cordinates of my vertices, but I don't know much about 3D....
Anyways scaling doesn't seem feasible with the default code provided by blit.c
)

If you don't understand the code that loads the jpeg, go to: http://www.jpegcameras.com/libjpeg/libjpeg-2.html. This is the jpeglib library explanation and to me it was easier to read this in parallel with code reading.

[thomas_fogh]

Thanks, I will take a look at blit.c (I don't want to use the luaplayer).
I tried searching the forum, but the most relevant I found had a broken link for the sources:
http://forums.ps2dev.org/viewtopic.php?t=6574
BR, Thomas Fogh

[willow :--)]

[thomas_fogh]

Oh, okay :) I'll look into it!
Thanks!