On Thu, 26 Sep 2013 13:05:48 +0200 Nicolas ALCOUFFE <nicolas.alcou...@free.fr>
said:
> Ok, it is working perfectly with:
>
> evas_object_image_size_set(evas_image, opencv_image.size().width,
> opencv_image.size().height);
> if (opencv_image.data) {
> evas_object_image_data_copy_set(evas_image, opencv_image.data);
> evas_object_image_data_update_add(evas_image, 0, 0,
> opencv_image.size().width, opencv_image.size().height);
> }
and now... it's doing a copy into evas's memory that it manages for the
buffer. :)
> I see in documentation:
> Note that the caller is responsible for freeing the buffer when finished
> with it, as user-set image data will not be automatically freed when the
> image object is deleted.
>
> How can i free, the buffer ?
you got it from opencv... i guess via some opencv method.. :)
>
> Thanks
> Nicolas.
> > On Thu, 26 Sep 2013 12:18:57 +0200 Nicolas ALCOUFFE
> > <nicolas.alcou...@free.fr> said:
> >
> > when you set the image data, evas doesnt COPY it... it refers to it.
> > directly. at any point that image object may possibly need to be rendered
> > evas will need access to the image data pointer and it must be VALID at all
> > times until the image object stops pointing to that data (set data to
> > NULL). if you set data without that data ptr being the ptr you get from
> > getting the data form evas (when evas itself manages and allocates the
> > image data)... then you are setting foreign data that YOU then manage (not
> > evas), and YOU must ensure the data is valid and available (given the image
> > size that has been set) for the lifespan of the image object as long as it
> > doesnt have the data unset... :)
> >
> >> What do you mean ?
> >>> you're freeing your image data before it gets rendered.
> >>>
> >>>
> >>> On Thu, Sep 26, 2013 at 10:58 AM, Nicolas ALCOUFFE
> >>> <nicolas.alcou...@free.fr
> >>>> wrote:
> >>>> Hi,
> >>>>
> >>>> For some reason, i need to convert an OpenCV image to Evas Image, i do:
> >>>>
> >>>> opencv_image = imread("fruits.jpg", 1);
> >>>> cvtColor(opencv_image, opencv_image, CV_BGR2BGRA);
> >>>>
> >>>> evas_image = evas_object_image_add(canvas);
> >>>> evas_object_image_colorspace_set(evas_image, EVAS_COLORSPACE_ARGB8888);
> >>>> evas_object_image_size_set(evas_image, opencv_image.size().width,
> >>>> opencv_image.size().height);
> >>>> evas_object_image_fill_set(evas_image, 0, 0, opencv_image.size().width,
> >>>> opencv_image.size().height);
> >>>> evas_object_resize (evas_image, opencv_image.size().width,
> >>>> opencv_image.size().height);
> >>>> evas_object_image_data_set(evas_image, opencv_image.data);
> >>>> evas_object_show(evas_image);
> >>>>
> >>>> This code is perfectly working, for only one image, so i created an
> >>>> Ecore Timer to get image in real time from my webcam:
> >>>> timer = ecore_timer_add(0.01, update, NULL);
> >>>>
> >>>> My update function is:
> >>>>
> >>>> Mat opencv_image;
> >>>> opencv_image = cvQueryFrame(capture);
> >>>> cvtColor(opencv_image, opencv_image, CV_BGR2BGRA);
> >>>> evas_object_image_size_set(evas_image, opencv_image.size().width,
> >>>> opencv_image.size().height);
> >>>> evas_object_image_fill_set(evas_image, 0, 0, opencv_image.size().width,
> >>>> opencv_image.size().height);
> >>>> evas_object_resize (evas_image, opencv_image.size().width,
> >>>> opencv_image.size().height);
> >>>> evas_object_image_data_set(evas_image, opencv_image.data);
> >>>>
> >>>> but when i'm running this, i get:
> >>>>
> >>>> Program received signal SIGSEGV, Segmentation fault.
> >>>> [Switching to Thread 0xb4ae4b40 (LWP 2383)]
> >>>> _op_copy_p_dp_mmx () at
> >>>> lib/evas/common/./evas_op_copy/op_copy_pixel_i386.c:8
> >>>> 8 MOVE_16DWORDS_MMX(s, d);
> >>>> (gdb) bt
> >>>> #0 _op_copy_p_dp_mmx () at
> >>>> lib/evas/common/./evas_op_copy/op_copy_pixel_i386.c:8
> >>>> #1 0xb78c0d54 in evas_common_scale_rgba_sample_draw () at
> >>>> lib/evas/common/evas_scale_sample.c:212
> >>>> #2 0xb78d5d3d in _draw_thread_image_draw () at
> >>>> modules/evas/engines/software_generic/evas_engine.c:1196
> >>>> #3 0xb78c83cb in evas_thread_worker_func () at
> >>>> lib/evas/common/evas_thread_render.c:107
> >>>> #4 0xb5e1552c in _eina_internal_call () at lib/eina/eina_thread.c:280
> >>>> #5 0xb7788d4c in start_thread (arg=0xb4ae4b40) at pthread_create.c:308
> >>>> #6 0xb76c7dde in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
> >>>>
> >>>> Someone know if it's a bug in evas or if i do something wrong ?
> >>>> I'm using efl from git.
> >>>>
> >>>> Thanks in advance for your response.
> >>>> Nicolas.
> >>>>
> >>>>
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