def render_slide(self, cr, cr_width, cr_height, slide):
"""Renders the slide C{current_slide} onto the given Cairo context C{cr}."""
cr.set_source_rgb(0.0, 0.0, 0.0)
cr.paint()
if slide.startswith('img::'):
img_filename = slide.split('img::')[-1].strip()
if not os.path.isabs(img_filename):
img_filename = os.path.join(self.base_dir, img_filename)
# load image surface
image_surface = None
if img_filename == '.png':
try:
# causes MemoryError if filename doesn't point to a PNG
image_surface = imageloader.image_surface_with_cairo(img_filename)
except MemoryError:
image_surface = imageloader.image_surface_with_pil(img_filename)
else:
image_surface = imageloader.image_surface_with_pil(img_filename)
# get geometry info
iw, ih = image_surface.get_width(), image_surface.get_height()
# scale factor and translation to zoom to center of image
sf = min(float(cr_width) / iw, float(cr_height) / ih) # scale factor
tx = (cr_width - sf * iw) / 2 # translate x
ty = (cr_height - sf * ih) / 2 # translate y
# paint image
cr.push_group()
cr.translate(tx, ty)
cr.scale(sf, sf)
cr.set_source_surface(image_surface, 0, 0)
cr.paint()
cr.pop_group_to_source()
cr.paint()
else:
# render some text (w/ pango)
pc = pangocairo.CairoContext(cr)
layout = pc.create_layout()
layout.set_font_description(pango.FontDescription("Yanone Tagesschrift %d" % int(cr_height/20.)))
layout.set_markup(slide)
layout.set_alignment(pango.ALIGN_CENTER)
layout.set_spacing(int(1./25 * cr_height * pango.SCALE))
ink_rect, logical_rect = layout.get_pixel_extents()
tx, ty, tw, th = logical_rect
cr.move_to((cr_width - tw)/2, (cr_height - th)/2)
cr.set_source_rgb(1.0, 1.0, 1.0)
pc.show_layout(layout)
def render_slide(cls, cr, cr_width, cr_height, slide):
"""Renders the slide C{current_slide} onto the given Cairo context C{cr}."""
# load image surface
image_surface = None
if slide[0][-4:].lower() == '.png':
try:
# causes MemoryError if filename doesn't point to a PNG
image_surface = imageloader.image_surface_with_cairo(slide[0])
except MemoryError:
image_surface = imageloader.image_surface_with_pil(slide[0])
else:
image_surface = imageloader.image_surface_with_pil(slide[0])
# get geometry info
iw, ih = image_surface.get_width(), image_surface.get_height()
# scale factor and translation to zoom to center of image
sf = max(float(cr_width) / iw, float(cr_height) / ih) # scale factor
tx = (cr_width - sf * iw) / 2 # translate x
ty = (cr_height - sf * ih) / 2 # translate y
# paint image
cr.push_group()
cr.translate(tx, ty)
cr.scale(sf, sf)
cr.set_source_surface(image_surface, 0, 0)
cr.paint()
cr.pop_group_to_source()
cr.paint()
# render some text (w/ pango)
pc = pangocairo.CairoContext(cr)
layout = pc.create_layout()
layout.set_font_description(pango.FontDescription("Yanone Kaffeesatz Bold %d" % int(cr_height/12.)))
layout.set_text(slide[1])
layout.set_indent(int(.03 * cr_width * pango.SCALE))
layout.set_spacing(int(1./60 * cr_height * pango.SCALE))
ink_rect, logical_rect = layout.get_pixel_extents()
cr.rectangle(0, int(.06 * cr_height),
int(logical_rect[2] + .06 * cr_width),
int(logical_rect[3] + .05 * cr_height)
)
cr.set_source_rgba(.90, .90, .90, .5)
cr.fill()
cr.move_to(0, int(.085 * cr_height)) # rect y_offset + rect_margin/2
cr.set_source_rgb(0.0, 0.0, 0.0)
pc.show_layout(layout)