8000 Add RGB565 format support by philsuth · Pull Request #48 · adafruit/Adafruit_CircuitPython_framebuf · GitHub
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Add RGB565 format support #48

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Merged
merged 7 commits into from
Dec 19, 2022
Merged

Add RGB565 format support #48

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5b1b4f2
Initial working version of rgb565 format extension
philsuth Nov 25, 2022
d3a74b3
WIP checkin - format improvements
philsuth Nov 25, 2022
ad9c752
Code blacked
philsuth Nov 25, 2022
7090f0d
Perform some small optimizations
philsuth Dec 2, 2022
8436072
Merge remote-tracking branch 'origin/main' into rgb565
philsuth Dec 2, 2022
3befa99
Fix pylint issues
philsuth Dec 2, 2022
3db43b3
Break too-long line
philsuth Dec 2, 2022
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55 changes: 54 additions & 1 deletion adafruit_framebuf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,57 @@ def fill_rect(framebuf, x, y, width, height, color):
height -= 1


class RGB565Format:
"""
This class implements the RGB565 format
It assumes a little-endian byte order in the frame buffer
"""

@staticmethod
def color_to_rgb565(color):
"""Convert a color in either tuple or 24 bit integer form to RGB565,
and return as two bytes"""
if isinstance(color, tuple):
hibyte = (color[0] & 0xF8) | (color[1] >> 5)
lobyte = ((color[1] << 5) & 0xE0) | (color[2] >> 3)
else:
hibyte = ((color >> 16) & 0xF8) | ((color >> 13) & 0x07)
lobyte = ((color >> 5) & 0xE0) | ((color >> 3) & 0x1F)
return bytes([lobyte, hibyte])

def set_pixel(self, framebuf, x, y, color):
"""Set a given pixel to a color."""
index = (y * framebuf.stride + x) * 2
framebuf.buf[index : index + 2] = self.color_to_rgb565(color)

@staticmethod
def get_pixel(framebuf, x, y):
"""Get the color of a given pixel"""
index = (y * framebuf.stride + x) * 2
lobyte, hibyte = framebuf.buf[index : index + 2]
r = hibyte & 0xF8
g = ((hibyte & 0x07) << 5) | ((lobyte & 0xE0) >> 5)
b = (lobyte & 0x1F) << 3
return (r << 16) | (g << 8) | b

def fill(self, framebuf, color):
"""completely fill/clear the buffer with a color"""
rgb565_color = self.color_to_rgb565(color)
for i in range(0, len(framebuf.buf), 2):
framebuf.buf[i : i + 2] = rgb565_color

def fill_rect(self, framebuf, x, y, width, height, color):
"""Draw a rectangle at the given location, size and color. The ``fill_rect`` method draws
both the outline and interior."""
# pylint: disable=too-many-arguments
rgb565_color = self.color_to_rgb565(color)
for _y in range(2 * y, 2 * (y + height), 2):
offset2 = _y * framebuf.stride
for _x in range(2 * x, 2 * (x + width), 2):
index = offset2 + _x
framebuf.buf[index : index + 2] = rgb565_color


class RGB888Format:
"""RGB888Format"""

Expand Down Expand Up @@ -203,6 +254,8 @@ def __init__(self, buf, width, height, buf_format=MVLSB, stride=None):
self.format = MHMSBFormat()
elif buf_format == RGB888:
self.format = RGB888Format()
elif buf_format == RGB565:
self.format = RGB565Format()
else:
raise ValueError("invalid format")
self._rotation = 0
Expand Down Expand Up @@ -419,7 +472,7 @@ def image(self, img):
if self.rotation in (1, 3):
width, height = height, width

if isinstance(self.format, RGB888Format) and img.mode != "RGB":
if isinstance(self.format, (RGB565Format, RGB888Format)) and img.mode != "RGB":
raise ValueError("Image must be in mode RGB.")
if isinstance(self.format, (MHMSBFormat, MVLSBFormat)) and img.mode != "1":
raise ValueError("Image must be in mode 1.")
Expand Down
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