Dear all,
We are trying to rotate the image using the suggestions mentioned below
/*/*Claudio Ciccani wrote:
Lu yunfeng wrote:
Dear Pedro,
My question is not the simple display of an image by DirectFB, I want to
rotate the image by 90 degrees first , then to display it by DirectFB. I
cannot find any APIs in DirectFB LIB which can support image rotation
display.
You can use TextureTriangles() to do that.
The following code blits "src" surface to "dst" surface rotated by 90
degrees.
/* BEGIN CODE */
DFBVertex v[4];
/* [x,y] are the coordinates of the destination point. */
/* [width,height] is the size of the source surface. */
v[0].x = x;
v[0].y = y;
v[0].z = 0;
v[0].w = 1;
v[0].s = 1;
v[0].t = 0;
v[1].x = x+width;
v[1].y = y;
v[1].z = 0;
v[1].w = 1;
v[1].s = 1;
v[1].t = 1;
v[2].x = x+width;
v[2].y = y+height;
v[2].z = 0;
v[2].w = 1;
v[2].s = 0;
v[2].t = 1;
v[3].x = x;
v[3].y = y+height;
v[3].z = 0;
v[3].w = 1;
v[3].s = 0;
v[3].t = 0;
dst->TextureTriangles( dst, src, v, NULL, 4, DTTF_FAN );
/* END CODE */
However this only works if TextureTriangles() is accelerated, since
there is not software fallback.
Yes, that's currently the only way to rotate it without doing it yourself.
You can also have a look the rotation code in DFBSee, but I don't
know how efficient that code is. The best way for the CPU to rotate
an image is to do it tile based to allow better cache usage, e.g.
rotate the image in 16x16 or 32x32 pixel blocks, depending on your
cache line length and pixel format.
--
Best regards,
Denis Oliver Kropp*/*/
But we are getting an error "ONCE [unimplemented blitting/drawing
function] *** [generic.c 7709 in gAcquire()] "
I am using DirectFB-1.0.0. We have tried DirectFB1.3 also . But we got
the same error in both cases.
Please help us if you have any solutions or comments.
Thanks & Regards,
Harikrishnan P
/**/
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