BitMapObject -> Datatype

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Fri, 2015-03-20 06:24

mritter0

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BitMapObject -> Datatype

Currently in my program I am loading a handful of images as BitMapObject. Is it possible to use NewDTObject() to "load" it and scale it, keeping the original in tact?

dto = NewDTObject(NULL,
    DTA_SourceType, DTST_MEMORY,
    DTA_SourceAddress, Object[IMG_IMAGE1],
    DTA_SourceSize, sizeof(Object[IMG_IMAGE1]),
    DTA_GroupID, GID_PICTURE,
    PDTA_DestMode, PMODE_V43,
TAG_DONE);

Then do some scaling on the new object.

That is not correct; just showing as an example of what I am wanting to do.

The images get used dozens of times. I don't want to have to keep reloading them over and over.

Fri, 2015-03-20 15:40

Massi

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@mritter0 I used datatypes

@mritter0

I used datatypes to load an image and then IGraphics->CompositeTags() to scale it. Loaded and scaled are distinct images.

Have a look at my image viewer HottiesView available from OS4 Depot, file HottiesView.c, LoadImageARGB32() and ScaleImage() methods.

Sat, 2015-03-21 03:07

mritter0

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Nice. Best example code I

Nice. Best example code I have seen. I have an idea on how to do what I envisioned.

Thanks!

Sun, 2015-04-12 22:13

mritter0

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I used your p96 bits of code

I used your p96 bits of code to load and scale (CompositeTags()). All is working the way I hoped. EXCEPT....none of the images have the transparency shown correctly; all have black backgrounds instead. I am using the main image code, not the thumbnail code.

I am on OS4.1FE using WinUAE so not a real 32bit video card. Is that all the problem is, or is there something more I need for the transparency? ReAction BitMap objects handle the transparency correctly.

Thanks for the code. It really helped.

Mon, 2015-04-13 15:33

(Reply to #4) #5

Massi

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@mritter0 I used your p96

@mritter0

I used your p96 bits of code to load and scale (CompositeTags()). All is working the way I hoped. EXCEPT....none of the images have the transparency shown correctly; all have black backgrounds instead. I am using the main image code, not the thumbnail code.

Well I don' t know exactly what you are doing and how. My source code uses IGraphics->CompositeTags() to make the transparency effect, search for "Blitting with alpha blend" comments.

I am on OS4.1FE using WinUAE so not a real 32bit video card. Is that all the problem is, or is there something more I need for the transparency? ReAction BitMap objects handle the transparency correctly.

OS4 emulated is not officially supported and I heard the current emulation has some limitations (128 MB RAM, 4 MB GFX RAM, no compositing, no overlay, no 3D).

Thanks for the code. It really helped.

You are welcome.

Wed, 2015-04-15 03:59

mritter0

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Sorry. Not transparency like

Sorry. Not transparency like you are doing with the thumbnail image. Alpha channel transparency for the background. They all show with black backgrounds for PNGs. I tried several different options but can't get it to work right.

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