[cairo] Cairo and animations

[Gerdus van Zyl]

I made a little program to render an animation using pycha
(http://www.lorenzogil.com/projects/pycha/)
Cairo 1.8. The result I get is pretty closely correlated to the size
of the graph, eg: 320x240=22fps, 640x480=9fps; Not sure what that
means. But when I have a cairo rendering that feels unresponsive I
usually try to minimize the animation or just render pieces at a time
instead.

On Fri, Dec 26, 2008 at 2:13 AM, Pietro Incardona <asmprog32 at hotmail.com> wrote:
>
>> What is happening is the program is uploading a large bitmap to the
>> video card which is slow and bypassing any optimizations.
>
> The code bottleneck is  offscreen
>
> The onscreen surface code is here
>
> gdk_draw_drawable(da->window,
>        da->style->fg_gc[GTK_WIDGET_STATE(da)], pixmap,
>        // Only copy the area that was exposed.
>        event->area.x, event->area.y,
>        event->area.x, event->area.y,
>        event->area.width, event->area.height);
>
>
> and it need less than 1 milliseconds
>
> I has flushed animations into the screen in Windows ( GDI , OpenGL D3D) and Linux with OpenGL and GtkGLExt
> Now i has not done DEEP benchmark on GDK ( with animations ) , but is impossible to believe that need more
>  than 1 sec to flush into the screen
>
>
>> Have you
>> tried not rendering using threads to an ofscreen surface and instead
>> going single thread and drawing on expose?
>
> Yes i use gdk_cairo_ create and the flush into the screen has no prob of performance, if cairo use gdk to flush, i suppose that GDK don' t need 1 sec to flush into the screen;
> the performance decrease when the draw on cairo became a little complex
>
> with
> (80 + 160 lines + 20 texts + 80 rectangles filled + 80 stoked + 40 rectangles semitrasparent filled)i has 1 - 2 frames / sec
>
>
> Now my code is not efficient and need to be more fast for a factor of 10X - 15X,  drawing is not optimized, but reading the optimizing i can do on draw
> i think can reach a factor of  3X - 4X ( very optimistic ).
>
> Now i am searching a new efficient code ( completly new )  or a guidelines to create animations
>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Wed, 24 Dec 2008 23:05:44 +0200
>> From: "Gerdus van Zyl"
>> Subject: Re: [cairo] Cairo and animations
>> To: cairo at cairographics.org
>> Message-ID:
>>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> What is happening is the program is uploading a large bitmap to the
>> video card which is slow and bypassing any optimizations. Have you
>> tried not rendering using threads to an ofscreen surface and instead
>> going single thread and drawing on expose?
>>
>> ~G
>>
>> On Wed, Dec 24, 2008 at 8:12 PM, Pietro Incardona  wrote:
>>>
>>> (Sorry ................ damn Linux Opera )
>>>
>>> Doing some benchmarks the bottleneck is located here
>>>
>>> struct timeb bbb1;
>>> struct timeb bbb2;
>>> double t = 0;
>>> ftime(&bbb1);
>>>
>>> cairo_t *cr_pixmap = gdk_cairo_create(pixmap);
>>> cairo_set_source_surface (cr_pixmap, cst, 0, 0);
>>> cairo_paint(cr_pixmap);
>>> cairo_destroy(cr_pixmap);
>>>
>>> ftime(&bbb2);
>>> t = (bbb2.time - bbb1.time) + (double)(bbb2.millitm - bbb1.millitm) / 1000.0;
>>> printf("do_draw bench %f \n",t);
>>>
>>> need 1 sec to execute the code
>>>
>>> ----------------------------------------
>>>> Date: Wed, 24 Dec 2008 13:47:37 +0100
>>>> From: bonzini at gnu.org
>>>> To: asmprog32 at hotmail.com
>>>> CC: cairo at cairographics.org
>>>> Subject: Re: Cairo and animations
>>>>
>>>> Pietro Incardona wrote:
>>>>>
>>>>> This is the code ( it draw one rectangle but the result don' t change )
>>>>
>>>> I haven't looked at it, but probably the culprit is transferring the
>>>> window pixels to the screen. When using OpenGL, for example, I have
>>>> seen sometimes glTexImage2D taking more time than the rest of the drawing.
>>>>
>>>> Paolo
>>>
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>>
>>
>
>
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