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st7920: Use display xor capability when animating glyphs 

Use the xor capability of the display to animate the glyphs, which
reduces the number of glyphs needed from 4 to 2.  This should make it
easier to add future animations if desired.

Suggested by @marcio-ao.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-10-04 13:46:28 -04:00
parent 630989c0fe
commit 97927172f1
1 changed files with 9 additions and 9 deletions
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18
klippy/extras/display/st7920.py
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@ -109,19 +109,19 @@ class ST7920:
0x0c] # Enable display and hide cursor
self.send(cmds)
# Setup animated glyphs
self.cache_glyph('fan1', 0)
self.cache_glyph('fan2', 1)
self.cache_glyph('bed_heat1', 2)
self.cache_glyph('bed_heat2', 3)
self.cache_glyph('fan2', 'fan1', 0)
self.cache_glyph('bed_heat2', 'bed_heat1', 1)
self.flush()
def cache_glyph(self, glyph_name, glyph_id):
def cache_glyph(self, glyph_name, base_glyph_name, glyph_id):
icon = icons.Icons16x16[glyph_name]
for i, bits in enumerate(icon):
base_icon = icons.Icons16x16[base_glyph_name]
for i, (bits, base_bits) in enumerate(zip(icon, base_icon)):
pos = glyph_id*32 + i*2
b1, b2 = (bits >> 8) & 0xff, bits & 0xff
b1, b2 = b1 ^ (base_bits >> 8) & 0xff, b2 ^ base_bits & 0xff
self.glyph_framebuffer[pos:pos+2] = [b1, b2]
self.all_framebuffers[1][1][pos:pos+2] = [b1 ^ 1, b2 ^ 1]
self.cached_glyphs[glyph_name] = (0, glyph_id*2)
self.cached_glyphs[glyph_name] = (base_glyph_name, (0, glyph_id*2))
def write_text(self, x, y, data):
if x + len(data) > 16:
data = data[:16 - min(x, 16)]
@ -139,8 +139,8 @@ class ST7920:
glyph_id = self.cached_glyphs.get(glyph_name)
if glyph_id is not None and x & 1 == 0:
# Render cached icon using character generator
self.write_text(x, y, glyph_id)
return 2
glyph_name = glyph_id[0]
self.write_text(x, y, glyph_id[1])
icon = icons.Icons16x16.get(glyph_name)
if icon is not None:
# Draw icon in graphics mode