+
+
+class BlendMode:
+ """
+ Options for modes to use by alphablend() function.
+ """
+
+ Normal = "bitmaptools.BlendMode.Normal"
+ Screen = "bitmaptools.BlendMode.Screen"
+
+
+def alphablend(
+ dest: Bitmap,
+ source1: Bitmap,
+ source2: Bitmap,
+ colorspace: Colorspace,
+ factor1: float = 0.5,
+ factor2: Optional[float] = None,
+ blendmode: BlendMode = BlendMode.Normal,
+ skip_source1_index: Optional[int] = None,
+ skip_source2_index: Optional[int] = None,
+):
+ """Alpha blend the two source bitmaps into the destination.
+
+ It is permitted for the destination bitmap to be one of the two
+ source bitmaps.
+
+ :param bitmap dest_bitmap: Destination bitmap that will be written into
+ :param bitmap source_bitmap_1: The first source bitmap
+ :param bitmap source_bitmap_2: The second source bitmap
+ :param float factor1: The proportion of bitmap 1 to mix in
+ :param float factor2: The proportion of bitmap 2 to mix in.
+ If specified as `None`, ``1-factor1`` is used. Usually the proportions should sum to 1.
+ :param displayio.Colorspace colorspace: The colorspace of the bitmaps.
+ They must all have the same colorspace. Only the following colorspaces are permitted:
+ ``L8``, ``RGB565``, ``RGB565_SWAPPED``, ``BGR565`` and ``BGR565_SWAPPED``.
+ :param bitmaptools.BlendMode blendmode: The blend mode to use. Default is Normal.
+ :param int skip_source1_index: Bitmap palette or luminance index in
+ source_bitmap_1 that will not be blended, set to None to blend all pixels
+ :param int skip_source2_index: Bitmap palette or luminance index in
+ source_bitmap_2 that will not be blended, set to None to blend all pixels
+
+ For the L8 colorspace, the bitmaps must have a bits-per-value of 8.
+ For the RGB colorspaces, they must have a bits-per-value of 16."""
+
+ def clamp(val, minval, maxval):
+ return max(minval, min(maxval, val))
+
+ ifactor1 = int(factor1 * 256)
+ ifactor2 = int(factor2 * 256)
+
+ width, height = dest.width, dest.height
+
+ if colorspace == "L8":
+ for y in range(height):
+ for x in range(width):
+ sp1 = source1[x, y]
+ sp2 = source2[x, y]
+ blend_source1 = skip_source1_index is None or sp1 != skip_source1_index
+ blend_source2 = skip_source2_index is None or sp2 != skip_source2_index
+
+ if blend_source1 and blend_source2:
+ sda = sp1 * ifactor1
+ sca = sp2 * ifactor2
+
+ if blendmode == BlendMode.Screen:
+ blend = sca + sda - (sca * sda // 65536)
+ elif blendmode == BlendMode.Normal:
+ blend = sca + sda * (256 - ifactor2) // 256
+
+ denom = ifactor1 + ifactor2 - ifactor1 * ifactor2 // 256
+ pixel = blend // denom
+ elif blend_source1:
+ pixel = sp1 * ifactor1 // 256
+ elif blend_source2:
+ pixel = sp2 * ifactor2 // 256
+ else:
+ pixel = dest[x, y]
+
+ dest[x, y] = clamp(pixel, 0, 255)
+
+ else:
+ swap = colorspace in ("RGB565_SWAPPED", "BGR565_SWAPPED")
+ r_mask = 0xF800
+ g_mask = 0x07E0
+ b_mask = 0x001F
+
+ for y in range(height):
+ for x in range(width):
+ sp1 = source1[x, y]
+ sp2 = source2[x, y]
+
+ if swap:
+ sp1 = ((sp1 & 0xFF) << 8) | ((sp1 >> 8) & 0xFF)
+ sp2 = ((sp2 & 0xFF) << 8) | ((sp2 >> 8) & 0xFF)
+
+ blend_source1 = skip_source1_index is None or sp1 != skip_source1_index
+ blend_source2 = skip_source2_index is None or sp2 != skip_source2_index
+
+ if blend_source1 and blend_source2:
+ ifactor_blend = ifactor1 + ifactor2 - ifactor1 * ifactor2 // 256
+
+ red_dca = ((sp1 & r_mask) >> 8) * ifactor1
+ grn_dca = ((sp1 & g_mask) >> 3) * ifactor1
+ blu_dca = ((sp1 & b_mask) << 3) * ifactor1
+
+ red_sca = ((sp2 & r_mask) >> 8) * ifactor2
+ grn_sca = ((sp2 & g_mask) >> 3) * ifactor2
+ blu_sca = ((sp2 & b_mask) << 3) * ifactor2
+
+ if blendmode == BlendMode.Screen:
+ red_blend = red_sca + red_dca - (red_sca * red_dca // 65536)
+ grn_blend = grn_sca + grn_dca - (grn_sca * grn_dca // 65536)
+ blu_blend = blu_sca + blu_dca - (blu_sca * blu_dca // 65536)
+ elif blendmode == BlendMode.Normal:
+ red_blend = red_sca + red_dca * (256 - ifactor2) // 256
+ grn_blend = grn_sca + grn_dca * (256 - ifactor2) // 256
+ blu_blend = blu_sca + blu_dca * (256 - ifactor2) // 256
+
+ r = ((red_blend // ifactor_blend) << 8) & r_mask
+ g = ((grn_blend // ifactor_blend) << 3) & g_mask
+ b = ((blu_blend // ifactor_blend) >> 3) & b_mask
+
+ pixel = (r & r_mask) | (g & g_mask) | (b & b_mask)
+
+ if swap:
+ pixel = ((pixel & 0xFF) << 8) | ((pixel >> 8) & 0xFF)
+
+ elif blend_source1:
+ r = ((sp1 & r_mask) * ifactor1 // 256) & r_mask
+ g = ((sp1 & g_mask) * ifactor1 // 256) & g_mask
+ b = ((sp1 & b_mask) * ifactor1 // 256) & b_mask
+ pixel = r | g | b
+ elif blend_source2:
+ r = ((sp2 & r_mask) * ifactor2 // 256) & r_mask
+ g = ((sp2 & g_mask) * ifactor2 // 256) & g_mask
+ b = ((sp2 & b_mask) * ifactor2 // 256) & b_mask
+ pixel = r | g | b
+ else:
+ pixel = dest[x, y]
+
+ print(f"pixel hex: {hex(pixel)}")
+ dest[x, y] = pixel
+
+
+class DitherAlgorithm:
+ """
+ Options for algorithm to use by dither() function.
+ """
+
+ Atkinson = "bitmaptools.DitherAlgorithm.Atkinson"
+ FloydStenberg = "bitmaptools.DitherAlgorithm.FloydStenberg"
+
+ atkinson = {
+ "count": 4,
+ "mx": 2,
+ "dl": 256 // 8,
+ "terms": [
+ {"dx": 2, "dy": 0, "dl": 256 // 8},
+ {"dx": -1, "dy": 1, "dl": 256 // 8},
+ {"dx": 0, "dy": 1, "dl": 256 // 8},
+ {"dx": 0, "dy": 2, "dl": 256 // 8},
+ ],
+ }
+
+ floyd_stenberg = {
+ "count": 3,
+ "mx": 1,
+ "dl": 7 * 256 // 16,
+ "terms": [
+ {"dx": -1, "dy": 1, "dl": 3 * 256 // 16},
+ {"dx": 0, "dy": 1, "dl": 5 * 256 // 16},
+ {"dx": 1, "dy": 1, "dl": 1 * 256 // 16},
+ ],
+ }
+
+ algorithm_map = {Atkinson: atkinson, FloydStenberg: floyd_stenberg}
+
+
+def dither(dest_bitmap, source_bitmap, colorspace, algorithm=DitherAlgorithm.Atkinson):
+ """Convert the input image into a 2-level output image using the given dither algorithm.
+
+ :param bitmap dest_bitmap: Destination bitmap. It must have
+ a value_count of 2 or 65536. The stored values are 0 and the maximum pixel value.
+ :param bitmap source_bitmap: Source bitmap that contains the
+ graphical region to be dithered. It must have a value_count of 65536.
+ :param colorspace: The colorspace of the image. The supported colorspaces
+ are ``RGB565``, ``BGR565``, ``RGB565_SWAPPED``, and ``BGR565_SWAPPED``
+ :param algorithm: The dither algorithm to use, one of the `DitherAlgorithm` values.
+ """
+ SWAP_BYTES = 1 << 0
+ SWAP_RB = 1 << 1
+ height, width = dest_bitmap.width, dest_bitmap.height
+ swap_bytes = colorspace in (Colorspace.RGB565_SWAPPED, Colorspace.BGR565_SWAPPED)
+ swap_rb = colorspace in (Colorspace.BGR565, Colorspace.BGR565_SWAPPED)
+ algorithm_info = DitherAlgorithm.algorithm_map[algorithm]
+ mx = algorithm_info["mx"]
+ count = algorithm_info["count"]
+ terms = algorithm_info["terms"]
+ dl = algorithm_info["dl"]
+
+ swap = 0
+ if swap_bytes:
+ swap |= SWAP_BYTES
+
+ if swap_rb:
+ swap |= SWAP_RB
+
+ print(f"swap: {swap}")
+
+ # Create row data arrays (3 rows with padding on both sides)
+ rowdata = [[0] * (width + 2 * mx) for _ in range(3)]
+ rows = [rowdata[0][mx:], rowdata[1][mx:], rowdata[2][mx:]]
+
+ # Output array for one row at a time (padded to multiple of 32)
+ out = [False] * (((width + 31) // 32) * 32)
+
+ # Helper function to fill a row with luminance data
+ def fill_row(bitmap, swap, luminance_data, y, mx):
+ if y >= bitmap.height:
+ return
+
+ # Zero out padding area
+ for i in range(mx):
+ luminance_data[-mx + i] = 0
+ luminance_data[bitmap.width + i] = 0
+
+ if bitmap._bits_per_value == 8:
+ for x in range(bitmap.width):
+ luminance_data[x] = bitmap[x, y]
+ else:
+ for x in range(bitmap.width):
+ pixel = bitmap[x, y]
+ if swap & SWAP_BYTES:
+ # Swap bytes (equivalent to __builtin_bswap16)
+ pixel = ((pixel & 0xFF) << 8) | ((pixel >> 8) & 0xFF)
+
+ r = (pixel >> 8) & 0xF8
+ g = (pixel >> 3) & 0xFC
+ b = (pixel << 3) & 0xF8
+
+ if swap & SWAP_BYTES:
+ r, b = b, r
+
+ # Calculate luminance using same formula as C version
+ luminance_data[x] = (r * 78 + g * 154 + b * 29) // 256
+
+ # Helper function to write pixels to destination bitmap
+ def write_pixels(bitmap, y, data):
+ if bitmap._bits_per_value == 1:
+ for i in range(0, bitmap.width, 32):
+ # Pack 32 bits into an integer
+ p = 0
+ for j in range(min(32, bitmap.width - i)):
+ p = p << 1
+ if data[i + j]:
+ p |= 1
+
+ # Write packed value
+ for j in range(min(32, bitmap.width - i)):
+ bitmap[i + j, y] = (p >> (31 - j)) & 1
+ else:
+ for i in range(bitmap.width):
+ bitmap[i, y] = 65535 if data[i] else 0
+
+ # Fill initial rows
+ fill_row(source_bitmap, swap, rows[0], 0, mx)
+ fill_row(source_bitmap, swap, rows[1], 1, mx)
+ fill_row(source_bitmap, swap, rows[2], 2, mx)
+
+ err = 0
+
+ for y in range(height):
+ # Going left to right
+ for x in range(width):
+ pixel_in = rows[0][x] + err
+ pixel_out = pixel_in >= 128
+ out[x] = pixel_out
+
+ err = pixel_in - (255 if pixel_out else 0)
+
+ # Distribute error to neighboring pixels
+ for i in range(count):
+ x1 = x + terms[i]["dx"]
+ dy = terms[i]["dy"]
+
+ rows[dy][x1] = ((terms[i]["dl"] * err) // 256) + rows[dy][x1]
+
+ err = (err * dl) // 256
+
+ write_pixels(dest_bitmap, y, out)
+
+ # Cycle the rows
+ rows[0], rows[1], rows[2] = rows[1], rows[2], rows[0]
+
+ y += 1
+ if y == height:
+ break
+
+ # Fill the next row for future processing
+ fill_row(source_bitmap, swap, rows[2], y + 2, mx)
+
+ # Going right to left
+ for x in range(width - 1, -1, -1):
+ pixel_in = rows[0][x] + err
+ pixel_out = pixel_in >= 128
+ out[x] = pixel_out
+
+ err = pixel_in - (255 if pixel_out else 0)
+
+ # Distribute error to neighboring pixels (in reverse direction)
+ for i in range(count):
+ x1 = x - terms[i]["dx"]
+ dy = terms[i]["dy"]
+
+ rows[dy][x1] = ((terms[i]["dl"] * err) // 256) + rows[dy][x1]
+
+ err = (err * dl) // 256
+
+ write_pixels(dest_bitmap, y, out)
+
+ # Cycle the rows again
+ rows[0], rows[1], rows[2] = rows[1], rows[2], rows[0]
+
+ # Fill the next row for future processing
+ fill_row(source_bitmap, swap, rows[2], y + 3, mx)
+
+
+def boundary_fill(
+ dest_bitmap: Bitmap,
+ x: int,
+ y: int,
+ fill_color_value: int,
+ replaced_color_value: Optional[int] = None,
+):
+ """Draws the color value into the destination bitmap enclosed
+ area of pixels of the background_value color. Like "Paint Bucket"
+ fill tool.
+
+ :param bitmap dest_bitmap: Destination bitmap that will be written into
+ :param int x: x-pixel position of the first pixel to check and fill if needed
+ :param int y: y-pixel position of the first pixel to check and fill if needed
+ :param int fill_color_value: Bitmap palette index that will be written into the
+ enclosed area in the destination bitmap
+ :param int replaced_color_value: Bitmap palette index that will filled with the
+ value color in the enclosed area in the destination bitmap"""
+ if fill_color_value == replaced_color_value:
+ return
+ if replaced_color_value == -1:
+ replaced_color_value = dest_bitmap[x, y]
+
+ fill_points = []
+ fill_points.append((x, y))
+
+ seen_points = []
+ minx = x
+ miny = y
+ maxx = x
+ maxy = y
+
+ while len(fill_points) > 0:
+ cur_point = fill_points.pop(0)
+ seen_points.append(cur_point)
+ cur_x = cur_point[0]
+ cur_y = cur_point[1]
+
+ cur_point_color = dest_bitmap[cur_x, cur_y]
+ if replaced_color_value is not None and cur_point_color != replaced_color_value:
+ continue
+ if cur_x < minx:
+ minx = cur_x
+ if cur_y < miny:
+ miny = cur_y
+ if cur_x > maxx:
+ maxx = cur_x
+ if cur_y > maxy:
+ maxy = cur_y
+
+ dest_bitmap[cur_x, cur_y] = fill_color_value
+
+ above_point = (cur_x, cur_y - 1)
+ below_point = (cur_x, cur_y + 1)
+ left_point = (cur_x - 1, cur_y)
+ right_point = (cur_x + 1, cur_y)
+
+ if (
+ above_point[1] >= 0
+ and above_point not in seen_points
+ and above_point not in fill_points
+ ):
+ fill_points.append(above_point)
+ if (
+ below_point[1] < dest_bitmap.height
+ and below_point not in seen_points
+ and below_point not in fill_points
+ ):
+ fill_points.append(below_point)
+ if (
+ left_point[0] >= 0
+ and left_point not in seen_points
+ and left_point not in fill_points
+ ):
+ fill_points.append(left_point)
+ if (
+ right_point[0] < dest_bitmap.width
+ and right_point not in seen_points
+ and right_point not in fill_points
+ ):
+ fill_points.append(right_point)
projects / hackapet / Adafruit_Blinka_Displayio.git / blobdiff