Curtis,
A couple things....first, you have scale factors set to 0 in your
snippet. They will need to be non-zero to show anything (1 is the default).
Have you looked at using the
"gerbv_export_png_file_from_project_autoscaled" function? It's probably
the preferred method of outputting a PNG file, since it will handle
scaling the board to fit your PNG resolution. Look at example3.c in the
doc/example-code directory within the git tree. You can avoid ever
having to deal with raw cairo surfaces using this function. Hope this
helps.
Cheers--
Julian
On 04/01/2011 11:26 AM, Curtis C. Pope wrote:
> Does anyone have a working example of using Cairo Rendering to a PNG
> file? I am converting some existing cairo code and can't seem to get it
> to work. I get it to create the surface and write the file, but none of
> the layer info is there. I'm sure its something simple I am missing
> with libgerbv but can't figure it out.
>
> Here is a code snippet:
>
> #include "gerbv.h"
>
> int
> main(int argc, char *argv[]) {
> /* create a top level libgerbv structure */
> gerbv_project_t *mainProject = gerbv_create_project();
> gerbv_render_info_t screenRenderInfo;
> screenRenderInfo.renderType = GERBV_RENDER_TYPE_CAIRO_HIGH_QUALITY;
> screenRenderInfo.displayWidth = 1024;
> screenRenderInfo.displayHeight = 768;
> screenRenderInfo.scaleFactorX = 0;
> screenRenderInfo.scaleFactorY = 0;
>
>
> /* parse my Gerber Files */
>
> gerbv_open_layer_from_filename (mainProject, "Nixie Tube
> Breakout.GTO");
> gerbv_open_layer_from_filename (mainProject, "Nixie Tube
> Breakout.GTS");
> gerbv_open_layer_from_filename (mainProject, "Nixie Tube
> Breakout.TXT");
> gerbv_open_layer_from_filename (mainProject, "Nixie Tube
> Breakout.GTL");
>
> /* Invert the Solder Mask Layer */
> mainProject->file[1]->transform.inverted = TRUE;
>
> /* Create the Cairo Surface */
> cairo_surface_t *surface;
> surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1024, 768);
> cairo_t *cr = cairo_create (surface);
>
> /* render all layers using the simple method */
> gerbv_render_all_layers_to_cairo_target (mainProject, cr,
> &screenRenderInfo);
>
> /* Write the service to file */
> cairo_surface_write_to_png(surface, "test.png");
>
>
> cairo_destroy (cr);
>
> return 0;
> }
>
> Thanks!
>
>
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