mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Matthew Stanley
35 lines
1.5 KiB
Python
35 lines
1.5 KiB
Python
"""Sample BMP pixel stats to verify rendering without an image viewer."""
|
|
import struct, sys
|
|
path = sys.argv[1] if len(sys.argv) > 1 else 'psx_screenshot.bmp'
|
|
with open(path, 'rb') as f:
|
|
f.seek(10); off = struct.unpack('<I', f.read(4))[0]
|
|
f.seek(18); w, h = struct.unpack('<ii', f.read(8))
|
|
print(f'Image: {w}x{h}, pixel data offset {off}')
|
|
row_bytes = ((w * 3 + 3) // 4) * 4
|
|
rows = abs(h)
|
|
f.seek(off)
|
|
rgb_rows = []
|
|
for r in range(rows):
|
|
rgb_rows.append(f.read(row_bytes))
|
|
rgb_rows.reverse() # BMP is bottom-up; reverse to make index 0 == top
|
|
def sample(top, bot, label):
|
|
total = 0; nonblack = 0
|
|
red = green = blue = white = 0
|
|
for r in range(top, bot):
|
|
row = rgb_rows[r]
|
|
for x in range(0, w * 3, 12):
|
|
total += 1
|
|
b, g, rr = row[x], row[x + 1], row[x + 2]
|
|
if b > 30 or g > 30 or rr > 30:
|
|
nonblack += 1
|
|
if rr > 100 and g < 50 and b < 50: red += 1
|
|
if g > 100 and rr < 50 and b < 50: green += 1
|
|
if b > 100 and rr < 50 and g < 50: blue += 1
|
|
if b > 200 and g > 200 and rr > 200: white += 1
|
|
pct = (100 * nonblack // total) if total else 0
|
|
print(f' {label} (rows {top}..{bot}): {nonblack}/{total} non-black ({pct}%) | R={red} G={green} B={blue} W={white}')
|
|
sample(0, rows // 3, 'top')
|
|
sample(rows // 3, 2 * rows // 3, 'middle')
|
|
sample(2 * rows // 3, rows, 'bottom')
|
|
sample(0, rows, 'whole')
|