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Diffstat (limited to 'include/pugl/detail/x11_cairo.c')
| -rw-r--r-- | include/pugl/detail/x11_cairo.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/include/pugl/detail/x11_cairo.c b/include/pugl/detail/x11_cairo.c new file mode 100644 index 0000000..0112c4e --- /dev/null +++ b/include/pugl/detail/x11_cairo.c @@ -0,0 +1,170 @@ +/* + Copyright 2012-2020 David Robillard <d@drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +/** + @file x11_cairo.c + @brief Cairo graphics backend for X11. +*/ + +#include "pugl/detail/types.h" +#include "pugl/detail/x11.h" +#include "pugl/pugl.h" +#include "pugl/pugl_cairo.h" + +#include <X11/Xutil.h> +#include <cairo-xlib.h> +#include <cairo.h> + +#include <stdlib.h> + +typedef struct { + cairo_surface_t* back; + cairo_surface_t* front; + cairo_t* cr; +} PuglX11CairoSurface; + +static void +puglX11CairoClose(PuglView* view) +{ + PuglInternals* const impl = view->impl; + PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface; + + cairo_surface_destroy(surface->front); + cairo_surface_destroy(surface->back); + surface->front = surface->back = NULL; +} + +static PuglStatus +puglX11CairoOpen(PuglView* view) +{ + PuglInternals* const impl = view->impl; + PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface; + + surface->back = cairo_xlib_surface_create(impl->display, + impl->win, + impl->vi->visual, + (int)view->frame.width, + (int)view->frame.height); + + surface->front = cairo_surface_create_similar( + surface->back, + cairo_surface_get_content(surface->back), + (int)view->frame.width, + (int)view->frame.height); + + if (cairo_surface_status(surface->back) || + cairo_surface_status(surface->front)) { + puglX11CairoClose(view); + return PUGL_CREATE_CONTEXT_FAILED; + } + + return PUGL_SUCCESS; +} + +static PuglStatus +puglX11CairoCreate(PuglView* view) +{ + PuglInternals* const impl = view->impl; + + impl->surface = (cairo_surface_t*)calloc(1, sizeof(PuglX11CairoSurface)); + + return PUGL_SUCCESS; +} + +static PuglStatus +puglX11CairoDestroy(PuglView* view) +{ + PuglInternals* const impl = view->impl; + PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface; + + puglX11CairoClose(view); + free(surface); + + return PUGL_SUCCESS; +} + +static PuglStatus +puglX11CairoEnter(PuglView* view, const PuglEventExpose* expose) +{ + PuglInternals* const impl = view->impl; + PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface; + PuglStatus st = PUGL_SUCCESS; + + if (expose && !(st = puglX11CairoOpen(view))) { + surface->cr = cairo_create(surface->front); + + if (cairo_status(surface->cr)) { + st = PUGL_CREATE_CONTEXT_FAILED; + } + } + + return st; +} + +static PuglStatus +puglX11CairoLeave(PuglView* view, const PuglEventExpose* expose) +{ + PuglInternals* const impl = view->impl; + PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface; + + if (expose) { + // Destroy front context and create a new one for drawing to the back + cairo_destroy(surface->cr); + surface->cr = cairo_create(surface->back); + + // Clip to expose region + cairo_rectangle(surface->cr, + expose->x, + expose->y, + expose->width, + expose->height); + cairo_clip(surface->cr); + + // Paint front onto back + cairo_set_source_surface(surface->cr, surface->front, 0, 0); + cairo_paint(surface->cr); + + // Flush to X and close everything + cairo_destroy(surface->cr); + cairo_surface_flush(surface->back); + puglX11CairoClose(view); + surface->cr = NULL; + } + + return PUGL_SUCCESS; +} + +static void* +puglX11CairoGetContext(PuglView* view) +{ + PuglInternals* const impl = view->impl; + PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface; + + return surface->cr; +} + +const PuglBackend* +puglCairoBackend(void) +{ + static const PuglBackend backend = {puglX11StubConfigure, + puglX11CairoCreate, + puglX11CairoDestroy, + puglX11CairoEnter, + puglX11CairoLeave, + puglX11CairoGetContext}; + + return &backend; +} |