This sample code is perfect one that i was finding and I checked it works
very well ! : )
but I have one more question.
:
img = evas_object_image_filled_add(evas_object_evas_get(win));
elm_win_resize_object_add(win, img);
// tell evas that this image will have its content modified dynamically
evas_object_image_content_hint_set(img, EVAS_IMAGE_CONTENT_HINT_DYNAMIC);
// tell evas that we want argb8888 (32bit color) colorspace per pixel
// i tried to chaned this to 16 bit rgb color space
evas_object_image_colorspace_set(img, EVAS_COLORSPACE_RGB565_A5P
/*EVAS_COLORSPACE_ARGB8888*/);
// do this if you want the alpha channel to work (or fill it with 0xff
// if you don't. this helps optimise rendering)
evas_object_image_alpha_set(img, 1);
// tell evas the size in pixels of the image data
evas_object_image_size_set (img, 480, 640); <<< i got "Aborted" stdout
around here!!!
evas_object_show(img);
:
actually, i want to use 16bit coloer spaced evas object,
but i got some abort error around "evas_object_image_size_set()" after
changing. (EVAS_COLORSPACE_RGB565_A5P)
sorry for that i could't find exact reason because i just traced some logs
using printf() now...
do you have any idea for this?
2010/7/15 Carsten Haitzler <ras...@rasterman.com>
> On Thu, 15 Jul 2010 15:38:07 +0900 Hyun Park <hyuny...@gmail.com> said:
>
> in efl, evas offers some basic object types. rectangle, image, text,
> textblock,
> polygon, line and smart object. all of these are basic rendering
> primitives..
> except smart objects. smart objects are "collectors" of other basic object
> types. they can collect images, text, or other smart objects together in a
> tree-like structure. smart objects are parents of children. children can be
> any
> object type. edje objects are simply pre-made smart objects that libedje
> creates and fills with data from files etc. elementary objects are the
> same.
> each elm object is a smart object that contains more objects. what it
> contains
> and how they behave is determined by elementary, thus setting up "policy".
>
> what you want is a very low-level feature. you want to get the image buffer
> of
> an image object, play with its contents, then have that content updated on
> the
> screen.
>
> going by your example below, you want a bg anyway. a background. leave
> that,
> BUT add an image object. like this:
>
> win = elm_win_add(NULL, "my application", ELM_WIN_BASIC);
> elm_win_title_set(win, "my application");
> evas_object_smart_callback_add(win, "delete,request", win_del, NULL);
>
> bg = elm_bg_add(win);
> elm_bg_file_set(bg, "sky_03.jpg", NULL);
> evas_object_size_hint_weight_set(bg, EVAS_HINT_EXPAND,
> EVAS_HINT_EXPAND);
> elm_win_resize_object_add(win, bg);
>
> img = evas_object_image_filled_add(evas_object_evas_get(win));
> elm_win_resize_object_add(win, img);
> // tell evas that this image will have its content modified dynamically
> evas_object_image_content_hint_set(img,
> EVAS_IMAGE_CONTENT_HINT_DYNAMIC);
> // tell evas that we want argb8888 (32bit color) colorspace per pixel
> evas_object_image_colorspace_set(img, EVAS_COLORSPACE_ARGB8888);
> // do this if you want the alpha channel to work (or fill it with 0xff
> // if you don't. this helps optimise rendering)
> evas_object_image_alpha_set(img, 1);
> // tell evas the size in pixels of the image data
> evas_object_image_size_set (img, 480, 640);
> evas_object_show(img);
>
> // to modify/fill pixels do this:
> unsigned int *pixels, *p;
> int stirde, x, y;
> // get data - yes, we want to write to it
> pixels = evas_object_image_data_get(img, 1);
> // get stride. this is in pixel units. so 4 bytes (1 int)
> stride = evas_object_image_stride_get(img);
> // set all the pixels in the image. just fill pixel based on x & y coord
> // with color values. notice we set alpha to 0xff (0xff000000). i assume
> // you understand argb colorspace and pixel values here.
> for (y = 0; y < 640; y++) {
> // get p as the start of the pixel row - stride is the line length
> p = pixels + (y * stride);
> for (x = 0; x < 480; x++) {
> // set each pixel
> *p++ = 0xff000000 | ((y & 0xff) << 16) | (x & 0xff);
> }
> }
> // put the data back as we are now done with it
> evas_object_image_data_set(img, pixels);
> // tell evas which area was changed in the pixels. here we tell it all
> of
> // the pixels were changed
> evas_object_image_data_update_add(img, 0, 0, 640, 480);
>
> repeat as needed filling/modifying any pixel in the image. you can modify
> 1, or
> small rects or the entire thing. if it has an alpha channel it will be
> blended
> per-pixel with the alpha value of that pixel. the above image will also get
> scaled as the image object is resized with standard smooth scaling.
> evas_object_image_smooth_scale_set() can enable or disable smooth scaling.
> you
> can change the image pixel size (this is the source image data - not the
> output
> size as evas will handle scaling for you you need to realize this). scaling
> in
> the software engine will come at a cost. smooth scaling is more costly than
> non-smooth. the gl engine will pretty much scale for free, but image
> updates
> come at a cost (texture upload). there is currently no zero-copy texture
> infrastructure in opengl that can avoid this.
>
> the above is the kind of mechanism things like emotion use to play video.
> it
> uses a yuv colorspace feature in evas to do video with planar setup.
>
> > Sorry for my unsufficient explanation, i'll explain more precisely below.
> >
> > My application will have some interfaces that are based on elementary
> widjet
> > and it has a core engine too, that processes something itself . If I
> could
> > give this core engine some methods, it'll draw its processing results on
> > that screen directly at any time it wants to update.
> >
> > > There are at least 2 solutions for your problem:
> > > 1) Use an evas image object as widget in elementary, and you set
> correctly
> > its bgra data
> > > 2) add API for elm_bg which gets and sets its bgra data
> >
> > I think 1) is the appropreate option for me.
> >
> > i'm confusing a little about what you said, "The Elementary widgets are
> evas
> > smart objects..." but you're saying
> > "1) Use an evas image object as widget in elementary..." also. "Evas
> image"
> > is 'basic object', right?
> > How can I this basic object(image) as a widjet in Elementary?
> >
> > besides, I found a "elm_image_add()" api, but i'm not sure it's useful or
> > not...
> >
> >
> > - hyun
> >
> > 2010/7/15 Vincent Torri <vto...@univ-evry.fr>
> >
> > >
> > > Hey,
> > >
> > >
> > > I tried to find some APIs from evas_image_* api in Evas.h and refered
> to
> > >> some sample codes concering this.
> > >> Finally, I wrote below test code, but it didn't work well that I
> intended.
> > >> It displays just only "sky_03.jpg" image on its entire window.
> > >>
> > >> Below source code seems looks weird, but I just wanted to test the
> > >> function
> > >> what I mentioned before.
> > >> (draw some rgb data directly on my elementry widget.)
> > >> Do you have any idea?
> > >>
> > >
> > > In Evas (the canvas used by elementary), you have basic objects (line,
> > > rectangle, image, etc...), and smart objects (consider them as a set of
> > > basic objects or smart objects, which behave correctly when you resize
> them,
> > > show them, etc...)
> > >
> > > The Elementary widgets are evas smart objects. You can't use the
> > > evas_object_image_* functions on them. These functions can only be used
> on
> > > the evas basic object 'image'. But you can use en evas object (basic or
> > > smart) as an elementary widget.
> > >
> > > There are at least 2 solutions for your problem:
> > >
> > > 1) Use an evas image object as widget in elementary, and you set
> correctly
> > > its bgra data
> > >
> > > 2) add API for elm_bg which gets and sets its bgra data
> > >
> > > Maybe it would be also useful for us if you explain precisely what you
> want
> > > to do before going further.
> > >
> > > Vincent
> > >
> > >
> > >> //==================================================================
> > >> #define MY_WIDTH 480
> > >> #define MY_HEIGHT 640
> > >>
> > >> static int buffer[MY_WIDTH * MY_HEIGHT] = {0,};
> > >>
> > >> EAPI int elm_main(int argc, char **argv)
> > >> {
> > >> Evas_Object *win, *bg;
> > >>
> > >> int w, h, *p;
> > >> p = buffer;
> > >> memset(buffer, sizeof(buffer), 0);
> > >> for (w = 0; w < MY_HEIGHT / 2; w++) {
> > >> for (h = 0; h < MY_WIDTH; h++) {
> > >> // just some color to draw again on 'bg' object
> > >> *p++ = (int) 0x00ff00ff;
> > >> }
> > >> printf("w=%d, h=%d\n",w, h);
> > >> }
> > >>
> > >> win = elm_win_add(NULL, "my application", ELM_WIN_BASIC);
> > >> elm_win_title_set(win, "my application");
> > >> evas_object_smart_callback_add(win, "delete,request", win_del,
> NULL);
> > >>
> > >> bg = elm_bg_add(win);
> > >> elm_bg_file_set(bg, "sky_03.jpg", NULL);
> > >> evas_object_size_hint_weight_set(bg, EVAS_HINT_EXPAND,
> > >> EVAS_HINT_EXPAND);
> > >> elm_win_resize_object_add(win, bg);
> > >>
> > >> evas_object_image_fill_set(bg, 0, 0, MY_WIDTH, MY_HEIGHT);
> > >> evas_object_image_size_set(bg, MY_WIDTH, MY_HEIGHT);
> > >> evas_object_image_data_copy_set(bg, buffer);
> > >> evas_object_image_alpha_set(bg, 1);
> > >> evas_object_show(bg);
> > >>
> > >> evas_object_size_hint_min_set(bg, 100, 100);
> > >> evas_object_size_hint_max_set(bg, MY_WIDTH, MY_HEIGHT);
> > >> evas_object_resize(win, MY_WIDTH, MY_HEIGHT);
> > >> evas_object_show(win);
> > >>
> > >> elm_run();
> > >> elm_shutdown();
> > >> return 0;
> > >> }
> > >> ELM_MAIN()
> > >> //==================================================================
> > >>
> > >>
> > >>
> > >> 2010/7/14 Carsten Haitzler <ras...@rasterman.com>
> > >>
> > >> On Wed, 14 Jul 2010 16:00:11 +0900 Hyun Park <hyuny...@gmail.com>
> said:
> > >>>
> > >>> Hi,
> > >>>>
> > >>>> Firstly, English is not my native language, please understand this :
> )
> > >>>>
> > >>>> I'm now trying to re-write my GTK application by using "Elementary"
> > >>>>
> > >>> widget
> > >>>
> > >>>> library.
> > >>>> I already checked test application, 'elementary_test' but I couldn't
> > >>>> find
> > >>>> some appropriate APIs
> > >>>> like "gdk_draw_rgb_image()" in Evas or something.
> > >>>>
> > >>>> I just want to draw some rgb data directly on my window widget.
> > >>>> Where can i find this kind of API or some example?
> > >>>>
> > >>>
> > >>> plain evas images. you can access the RGBA pixels directly via
> pointer.
> > >>> expedite (benchmark suite) has tests for this (RGBA and ARGBA Alpha
> > >>> data).
> > >>> you
> > >>> can just stick an evas image into elementary and have fun. remember
> to
> > >>> set
> > >>> the
> > >>> data back when done and to add update rects. also use stride value
> > >>> return.
> > >>> see
> > >>> the evas_image_* api in Evas.h
> > >>>
> > >>> --
> > >>> ------------- Codito, ergo sum - "I code, therefore I am"
> --------------
> > >>> The Rasterman (Carsten Haitzler) ras...@rasterman.com
> > >>>
> > >>>
> > >>>
> ------------------------------------------------------------------------------
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> > >>
> > >>
> > >>
> >
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>
>
> --
> ------------- Codito, ergo sum - "I code, therefore I am" --------------
> The Rasterman (Carsten Haitzler) ras...@rasterman.com
>
>
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