Load jpg or bmp file to window

This is a discussion on Load jpg or bmp file to window within the C++ Programming forums, part of the General Programming Boards category; Hello. I have picture file and i want to load it to win32 consol project. How can i do that ...

  1. #1
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    Load jpg or bmp file to window

    Hello.
    I have picture file and i want to load it to win32 consol project.
    How can i do that without making a text file with 3 matrix of the RGB colors ?

    I dont want to use matrix file, because the picture is 700*700 pixels, and it takes something like 10-15 seconds to load it.

  2. #2
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    You can probably find some code to read a BMP or JPEG - in fact, there's something called libjpeg that does the latter.

    But I'm curious as to how you manage to consume 10-15 seconds on reading 700 x 700 x 3 byte matrix - my only guess is that you are doing that in some incredibly pessimal way. Perhaps if you post the code that you use for that, we can suggest something better.

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    Its taking so much time because i use glut library to read each point color, and then print that point on the screen...

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    Surely you can use some OpenGL function to draw a bitmap directly?

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    Please don't PM me for help - and no, I don't do help over instant messengers.

  5. #5
    Unregistered User Yarin's Avatar
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    >> Surely you can use some OpenGL function to draw a bitmap directly?
    I've tried that, it's very slow. You have to use vertexs in ogl before it's worth using.
    A class that doesn't overload all operators just isn't finished yet. -- SmugCeePlusPlusWeenie
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    C++まいる!Cをこわせ! Elysia's Avatar
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    That doesn't make sense. Rendering a static image onto a window is something that even the worst graphics card can do 1000+ times per second.
    (OK, so it's not that easy, but in theory, this is true.)
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    Unregistered User Yarin's Avatar
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    Maybe I was doing it wrong then, all I know is I was exploring ogl's capabilities, and found a function like glImage() or somthing like that, and it would draw an image like gdi would, with no 3d capabilities. And it was very slow.
    A class that doesn't overload all operators just isn't finished yet. -- SmugCeePlusPlusWeenie
    A year spent in artificial intelligence is enough to make one believe in God. -- Alan J. Perlis

  8. #8
    Malum in se abachler's Avatar
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    CxImage is the best JPG converter ive found, much easier to use (IMO) than libjpeg and supports more formats.
    Until you can build a working general purpose reprogrammable computer out of basic components from radio shack, you are not fit to call yourself a programmer in my presence. This is cwhizard, signing off.

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