像素区域比较

Question

我正在尝试为 GIMP 编写一个 python 脚本，其目的是将图片分割成一个图块集（识别图片中每个唯一的 16x16 图块）。

到目前为止，我能够读取图块（实际上是一个 16x16 像素的区域）并将其写入某处。但是我所有比较图块的尝试都失败了。

我错过了什么吗？我的脚本如下：

#!/usr/bin/env python

from gimpfu import *

    # compare 2 tiles,
    # return 1 if identical, false otherwise
def tileCompare(tile1, tile2):
    if(tile1 == tile2):
        return 1
    return 0

     # return tile at (x, y) coordinates
def readTile(layer, x, y):
    pr = layer.get_pixel_rgn(x,y,16,16)
    return pr[x:x+16, y:y+16]

    # write tile at (x, y) coordinates on given layer
def writeTile(layer, x, y, tile):    
    pr = layer.get_pixel_rgn(x,y,16,16)
    pr[x:x+16, y:y+16] = tile

def TilesSlicer(sourceLayer, targetLayer):
        # Actual plug-in code will go here

        # iterate tiles (result in tileSource)
    for x in range(0, sourceLayer.width, 16):
        for y in range(0, sourceLayer.height, 16):
            tileSource = readTile(sourceLayer, x, y)
            found = 0
                # iterate tiles again (result in tileIterator)
            for a in range(0, sourceLayer.width, 16):
                for b in range(0, sourceLayer.height, 16):
                    tileIterator = readTile(sourceLayer, x, y)
                        # compare tiles
                        # if identical and not yet found
                        # write it in the target layer
                    if (tileCompare(tileSource, tileIterator) == 1):
                        if(found == 0):
                            writeTile(tileIterator, a, b, tileSource)
                        found = 1

register(
    "TilesSlicer",
    "Tiles slicer",
    "Slice a picture into tiles",
    "Fabrice Lambert",
    "Fabrice Lambert",
    "April 2019",
    "Tiles slicer...",
    "RGB*",
    [
    (PF_DRAWABLE, "sourceLayer", "Source Layer: ", None),
    (PF_DRAWABLE, "targetLayer", "Target Layer: ", None),
    ],
    [],
    TilesSlicer,
        menu="<Image>/Filters/My Scripts")

main()

感谢您的建议。

Answer 1

Nvm,

我发现了问题：
tileIterator = readTile(sourceLayer, a, b)
而不是：
tileIterator = readTile(sourceLayer, x, y)

Answer 2

好的，

稍加修改后的脚本如下：
- 添加了瓷砖宽度和高度以处理任何瓷砖尺寸。
- 删除了目标层参数，脚本现在创建它。
- 添加了实时显示以向用户提供反馈（遗憾的是，进度条不起作用）。
- 提高了速度。

#!/usr/bin/env python

from gimpfu import *

    # compare 2 tiles,
    # return 1 if identical, 0 otherwise
def tileCompare(tile1, tile2):
    if(tile1 == tile2):
        return 1
    return 0

     # return tile at (x, y) coordinates
def readTile(layer, x, y, width, height):
    pr = layer.get_pixel_rgn(x, y, width, height)
    return pr[x:x+width, y:y+height]

    # write tile at (x, y) coordinates on given layer
def writeTile(layer, x, y, width, height, tile):    
    pr = layer.get_pixel_rgn(x, y, width, height)
    pr[x:x+width, y:y+height] = tile
    layer.update(x, y, width, height)
    gimp.displays_flush()

def TilesSlicer(sourceLayer, tileWidth, tileHeight):
        # Actual plug-in code will go here
    if((sourceLayer.width % tileWidth) != 0):
        gimp.message("The layer width is not multiple of " + str(tileWidth))
        gimp.quit()
    if((sourceLayer.height % tileWidth) != 0):
        gimp.message("The layer height is not multiple of " + str(tileHeight))
        gimp.quit()
    totalTiles = (sourceLayer.width / tileWidth) * (sourceLayer.height / tileHeight)
    tilesProcessed = 0

    gimp.progress_init("Processing...")
    gimp.progress_update(0.0)

    sourceImage = sourceLayer.image
    targetLayer = pdb.gimp_layer_new(sourceImage, sourceLayer.width, sourceLayer.height, sourceImage.base_type, "Target", 100.0, sourceLayer.mode)
    targetLayer.add_alpha()
    targetLayer.fill(TRANSPARENT_FILL)
    sourceImage.add_layer(targetLayer, 0)
        # iterate tiles (result in tileSource)
    for x in range(0, sourceLayer.width, tileWidth):
        for y in range(0, sourceLayer.height, tileHeight):
            tileSource = readTile(sourceLayer, x, y, tileWidth, tileHeight)
            found = 0
                # iterate tiles again (result in tileIterator)
            for a in range(0, sourceLayer.width, tileWidth):
                for b in range(0, sourceLayer.height, tileHeight):
                    tileIterator = readTile(sourceLayer, a, b, tileWidth, tileHeight)
                        # compare tiles
                        # if identical and not yet found
                        # write it in the target layer
                        # and abort iteration (for speed purpose)
                    if (tileCompare(tileSource, tileIterator) == 1):
                        if(found == 0):
                            writeTile(targetLayer, a, b, tileWidth, tileHeight, tileIterator)
                        found = 1
                        break
                if(found == 1):
                    break
            tilesProcessed = tilesProcessed + 1
            gimp.progress_update(tilesProcessed / totalTiles)
            gimp.displays_flush()

register(
    "TilesSlicer",
    "Tiles slicer",
    "Slice a picture into tiles",
    "Fabrice Lambert",
    "Fabrice Lambert",
    "April 2019",
    "Tiles slicer...",
    "RGB*",
    [
    (PF_DRAWABLE, "sourceLayer", "Source Layer: ", None),
    (PF_INT8, "tileWidth", "Tile width: ", 16),
    (PF_INT8, "tileHeight", "Tile height: ", 16),
    ],
    [],
    TilesSlicer, 
        menu="<Image>/Filters/My Scripts")

main()

可能还可以再细化一下，如果有人对进度条有什么处理，请告诉我。
我乐于接受建议。

像素区域比较

Pixels regions comparision

gimp

python-fu