gp_toolbox/OP_palettes.py

import bpy
import json
import os
from bpy_extras.io_utils import ImportHelper, ExportHelper
from pathlib import Path
from .utils import convert_attr, get_addon_prefs

### --- Json serialized material load/save

def load_palette(context, filepath):
    with open(filepath, 'r') as fd:
        mat_dic = json.load(fd)
    # from pprint import pprint
    # pprint(mat_dic)
    
    ob = context.object
    for mat_name, attrs in mat_dic.items():
        curmat = bpy.data.materials.get(mat_name)
        if curmat:#exists
            if curmat.is_grease_pencil:
                if curmat not in ob.data.materials[:]:# add only if it's not already there
                    ob.data.materials.append(curmat)
                continue
            else:
                mat_name = mat_name+'.01'#rename to avoid conflict

        ## to create a GP mat (from https://developer.blender.org/T67102)
        mat = bpy.data.materials.new(name=mat_name)
        bpy.data.materials.create_gpencil_data(mat)#cast to GP mat
        
        ob.data.materials.append(mat)
        for attr, value in attrs.items():
            setattr(mat.grease_pencil, attr, value)


class GPTB_OT_load_default_palette(bpy.types.Operator):
    bl_idname = "gp.load_default_palette"
    bl_label = "Load basic palette"
    bl_description = "Load a material palette on the current GP object\nif material name already exists in scene it will uses these"
    bl_options = {"REGISTER", "INTERNAL"}

    # path_to_pal : bpy.props.StringProperty(name="paht to palette", description="path to the palette", default="")
    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GREASEPENCIL'

    def execute(self, context):
        # Start Clean (delete unuesed sh*t)
        bpy.ops.object.material_slot_remove_unused()
        #Rename default solid stroke if still there
        line = context.object.data.materials.get('Black')
        if line:
            line.name = 'line'
        if not line:
            line = context.object.data.materials.get('Solid Stroke')
            if line:
                line.name = 'line'

        # load json
        pfp = Path(bpy.path.abspath(get_addon_prefs().palette_path))
        if not pfp.exists():
            self.report({'ERROR'}, f'Palette path not found')
            return {"CANCELLED"}

        base = pfp / 'base.json'
        if not base.exists():
            self.report({'ERROR'}, f'base.json palette not found in {pfp.as_posix()}')
            return {"CANCELLED"}

        load_palette(context, base)
        self.report({'INFO'}, f'Loaded base Palette')

        return {"FINISHED"}


class GPTB_OT_load_palette(bpy.types.Operator, ImportHelper):
    bl_idname = "gp.load_palette"
    bl_label = "Load palette"
    bl_description = "Load a material palette on the current GP object\nif material name already exists in scene it will uses these"
    #bl_options = {"REGISTER", "INTERNAL"}

    # path_to_pal : bpy.props.StringProperty(name="paht to palette", description="path to the palette", default="")
    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GREASEPENCIL'

    filename_ext = '.json'

    filter_glob: bpy.props.StringProperty(default='*.json', options={'HIDDEN'} )#*.jpg;*.jpeg;*.png;*.tif;*.tiff;*.bmp
    
    filepath : bpy.props.StringProperty(
        name="File Path", 
        description="File path used for import", 
        maxlen= 1024)

    def execute(self, context):
        # load json
        load_palette(context, self.filepath)
        self.report({'INFO'}, f'settings loaded from: {os.path.basename(self.filepath)}')

        return {"FINISHED"}


class GPTB_OT_save_palette(bpy.types.Operator, ExportHelper):
    bl_idname = "gp.save_palette"
    bl_label = "save palette"
    bl_description = "Save a material palette from material on current GP object."
    #bl_options = {"REGISTER", "INTERNAL"}

    # path_to_pal : bpy.props.StringProperty(name="paht to palette", description="path to the palette", default="")
    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GREASEPENCIL'

    filter_glob: bpy.props.StringProperty(default='*.json', options={'HIDDEN'})#*.jpg;*.jpeg;*.png;*.tif;*.tiff;*.bmp
    
    filename_ext = '.json'

    filepath : bpy.props.StringProperty(
        name="File Path", 
        description="File path used for export", 
        maxlen= 1024)

    def execute(self, context):
        ob = context.object

        exclusions = ('bl_rna', 'rna_type')
        # save json
        dic = {}
        allmat=[]
        for mat in ob.data.materials:
            if not mat:
                continue
            if not mat.is_grease_pencil:
                continue
            if mat in allmat:
                continue
            allmat.append(mat)
            
            dic[mat.name] = {}
            
            for attr in dir(mat.grease_pencil):
                if attr.startswith('__'):
                    continue
                if attr in exclusions:
                    continue
                if mat.grease_pencil.bl_rna.properties[attr].is_readonly:#avoid readonly
                    continue

                dic[mat.name][attr] = convert_attr(getattr(mat.grease_pencil, attr))
        
        if not dic:
            self.report({'ERROR'}, f'No materials on this GP object')
            return {"CANCELLED"}

        # export
        with open(self.filepath, 'w') as fd:
            json.dump(dic, fd, indent='\t')

        self.report({'INFO'}, f'Palette saved: {self.filepath}')#WARNING, ERROR
        return {"FINISHED"}


### --- Direct material append/link from blend file


def load_blend_palette(context, filepath):
    '''Load materials on current active object from current chosen blend'''

    print(f'-- import palette from : {filepath} --')
    for ob in context.selected_objects:
        if ob.type != 'GREASEPENCIL':
            print(f'{ob.name} not a GP object')
            continue

        print('\n', ob.name, ':')
        obj_mats = [m.name for m in ob.data.materials if m]# can found Nonetype 
        scene_mats = [m.name for m in bpy.data.materials]

        # Link into the blend file
        with bpy.data.libraries.load(filepath, link=False) as (data_from, data_to):
            for name in data_from.materials:
                if name.lower() in ('bg', 'line', 'dots stroke'):
                    continue
                
                if name in obj_mats:
                    print(f"!- {name} already in object materials")
                    continue
                
                if name in scene_mats:
                    print(f'- {name} (found in scene)')
                    ob.data.materials.append(bpy.data.materials[name])
                    continue
                    ## TODO find a way to Update color !... complex...

                data_to.materials.append(name)

        if not data_to.materials:
            # print('Nothing to link/append from lib palette!')
            continue 

        print('From palette append:')
        for mat in data_to.materials:
            print(f'- {mat.name}')
            ob.data.materials.append(mat)

    print(f'-- import Done --')

    ## list sources in a palette txt data block
    palette_txt = bpy.data.texts.get('palettes')
    if not palette_txt:
        palette_txt = bpy.data.texts.new('palettes')
    
    lines = [l.body for l in palette_txt.lines]
    if not os.path.basename(filepath) in lines:
        palette_txt.write('\n' + os.path.basename(filepath))

class GPTB_OT_load_blend_palette(bpy.types.Operator, ImportHelper):
    bl_idname = "gp.load_blend_palette"
    bl_label = "Load colo palette"
    bl_description = "Load a material palette from blend file on the current GP object\nif material name already exists in scene it will uses these"
    #bl_options = {"REGISTER", "INTERNAL"}

    # path_to_pal : bpy.props.StringProperty(name="paht to palette", description="path to the palette", default="")
    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GREASEPENCIL'

    filename_ext = '.blend'

    filter_glob: bpy.props.StringProperty(default='*.blend', options={'HIDDEN'} )#*.jpg;*.jpeg;*.png;*.tif;*.tiff;*.bmp
    
    filepath : bpy.props.StringProperty(
        name="File Path", 
        description="File path used for import", 
        maxlen= 1024)

    def execute(self, context):
        # load json
        load_blend_palette(context, self.filepath)
        self.report({'INFO'}, f'materials loaded from: {os.path.basename(self.filepath)}')

        return {"FINISHED"}


class GPTB_OT_copy_active_to_selected_palette(bpy.types.Operator):
    bl_idname = "gp.copy_active_to_selected_palette"
    bl_label = "Append Materials To Selected"
    bl_description = "Copy all the materials of the active GP objects to the material stack of all the other selected GP"
    bl_options = {"REGISTER"} # , "INTERNAL"

    # path_to_pal : bpy.props.StringProperty(name="paht to palette", description="path to the palette", default="")
    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GREASEPENCIL'

    def execute(self, context):
        ob = context.object
        if not len(ob.data.materials):
            self.report({'ERROR'}, 'No materials to transfer')
            return {"CANCELLED"}

        selection = [o for o in context.selected_objects if o.type == 'GREASEPENCIL' and o != ob]

        if not selection:
            self.report({'ERROR'}, 'Need to have other Grease pencil objects selected to receive active object materials')
            return {"CANCELLED"}

        ct = 0
        for o in selection:
            for mat in ob.data.materials:
                if mat in o.data.materials[:]:
                    continue
                o.data.materials.append(mat)
                ct += 1
        
        if ct:
            self.report({'INFO'}, f'{ct} Materials appended')
        else:
            self.report({'WARNING'}, 'All materials are already in other selected object')

        return {"FINISHED"}


class GPTB_OT_clean_material_stack(bpy.types.Operator):
    bl_idname = "gp.clean_material_stack"
    bl_label = "Clean Material Stack"
    bl_description = "Clean materials duplication in active GP object stack"
    bl_options = {"REGISTER", "UNDO"} # , "INTERNAL"



    use_clean_mats : bpy.props.BoolProperty(name="Remove Duplication", 
        description="All duplicated material (with suffix .001, .002 ...) will be replaced by the material with clean name (if found in scene)" ,
        default=True)

    skip_different_materials : bpy.props.BoolProperty(name="Skip Different Material", 
        description="Will not touch duplication if color settings are different (and show infos about skipped materials)",
        default=True)

    use_fuses_mats : bpy.props.BoolProperty(name="Fuse Materials Slots", 
        description="Fuse materials slots when multiple uses same materials",
        default=True)
    
    remove_empty_slots : bpy.props.BoolProperty(name="Remove Empty Slots", 
        description="Remove slots that haven't any material attached ", 
        default=True)

    # skip_binded_empty_slots : bpy.props.BoolProperty(name="Skip Binded Empty slots", 
    #     description="Remove only empty slots that haven't any material attached", 
    #     default=False)
    

    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GREASEPENCIL'

    def invoke(self, context, event):
        self.ob = context.object
        return context.window_manager.invoke_props_dialog(self)

    def draw(self, context):
        layout = self.layout
        
        box = layout.box()
        box.prop(self, 'use_clean_mats')
        if self.use_clean_mats:
            box.prop(self, 'skip_different_materials')

        # layout.separator()
        box = layout.box()
        box.prop(self, 'use_fuses_mats')
        box = layout.box()
        box.prop(self, 'remove_empty_slots')
        # if self.remove_empty_slots:
        #     box.prop(self, 'skip_binded_empty_slots')
        

    def different_gp_mat(self, mata, matb):
        a = mata.grease_pencil
        b = matb.grease_pencil
        if a.color[:] != b.color[:]:
            return f'! {self.ob.name}: {mata.name} and {matb.name} stroke color is different'
        if a.fill_color[:] != b.fill_color[:]:
            return f'! {self.ob.name}: {mata.name} and {matb.name} fill_color color is different'
        if a.show_stroke != b.show_stroke:
            return f'! {self.ob.name}: {mata.name} and {matb.name} stroke has different state'
        if a.show_fill != b.show_fill:
            return f'! {self.ob.name}: {mata.name} and {matb.name} fill has different state'

    ## Clean dups

    def clean_mats_duplication(self, ob):
        import re
        diff_ct = 0
        todel = []
        if ob.type != 'GREASEPENCIL':
            return
        if not hasattr(ob, 'material_slots'):
            return
        for i, ms in enumerate(ob.material_slots):
            mat = ms.material
            if not mat:
                continue
            match = re.search(r'(.*)\.\d{3}$', mat.name)
            if not match:
                continue
            basemat = bpy.data.materials.get(match.group(1))
            if not basemat:
                continue
            diff = self.different_gp_mat(mat, basemat)
            if diff:
                print(diff)
                diff_ct += 1
                if self.skip_different_materials:
                    continue

            if mat not in todel:
                todel.append(mat)
            ms.material = basemat
            print(f'{ob.name} : slot {i} >> replaced {mat.name}')
            mat.use_fake_user = False

        ### delete (only when using on all objects loop, else can delete another objects mat...)
        ## for m in reversed(todel):
        ##     bpy.data.materials.remove(m)

        if diff_ct:
            return('INFO', f'{diff_ct} mat skipped >> same name but different color settings!')

    ## fuse

    def fuse_object_mats(self, ob):
        for i in range(len(ob.material_slots))[::-1]:
            ms = ob.material_slots[i]
            mat = ms.material
            # if not mat:
            #     # remove empty slots
            #     if self.remove_empty_slots:
            #         ob.active_material_index = i
            #         bpy.ops.object.material_slot_remove()
            #     continue
            
            # update mat list
            mlist = [ms.material for ms in ob.material_slots if ms.material]
            if mlist.count(mat) > 1:
                # get first material in list
                new_mat_id = mlist.index(mat)
                
                # iterate in all strokes and replace with new_mat_id
                for l in ob.data.layers:
                    for f in l.frames:
                        for s in f.drawing.strokes:
                            if s.material_index == i:
                                s.material_index = new_mat_id

                # delete slot (or add to the remove_slot list
                ob.active_material_index = i
                bpy.ops.object.material_slot_remove()

    def delete_empty_material_slots(self, ob):
        for i in range(len(ob.material_slots))[::-1]:
            ms = ob.material_slots[i]
            mat = ms.material
            if not mat:
                # is_binded=False
                # if self.skip_binded_empty_slots:
                #     for l in ob.data.layers:
                #         for f in l.frames:
                #             for s in f.drawing.strokes:
                #                 if s.material_index == i:
                #                     is_binded = True
                #                     break
                # if is_binded:
                #     continue

                ob.active_material_index = i
                bpy.ops.object.material_slot_remove()

    def execute(self, context):
        ob = context.object
        info = None

        if not self.use_clean_mats and not self.use_fuses_mats and not self.remove_empty_slots:            
            self.report({'ERROR'}, 'At least one operation should be selected')
            return {"CANCELLED"}

        if self.use_clean_mats:
            info = self.clean_mats_duplication(ob)
        if self.use_fuses_mats:
            self.fuse_object_mats(ob)
        if self.remove_empty_slots:
            self.delete_empty_material_slots(ob)
        
        if info:
            self.report({info[0]}, info[1])
        # else:
        #     self.report({'WARNING'}, '')

        return {"FINISHED"}

classes = (
GPTB_OT_load_palette,
GPTB_OT_save_palette,
GPTB_OT_load_default_palette,
GPTB_OT_load_blend_palette,
GPTB_OT_copy_active_to_selected_palette,
GPTB_OT_clean_material_stack,

)

def register():
    for cls in classes:
        bpy.utils.register_class(cls)

def unregister():
    for cls in reversed(classes):
        bpy.utils.unregister_class(cls)