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#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
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# ##### END GPL LICENSE BLOCK #####

bl_info = {
    "name": "Import Images as Planes",
    "author": "Florian Meyer (tstscr), mont29, matali",
    "version": (1, 9, 1),
    "blender": (2, 69, 0),
    "location": "File > Import > Images as Planes or Add > Mesh > Images as Planes",
    "description": "Imports images and creates planes with the appropriate aspect ratio. "
                   "The images are mapped to the planes.",
    "warning": "",
    "wiki_url": "http://wiki.blender.org/index.php/Extensions:2.6/Py/"
                "Scripts/Add_Mesh/Planes_from_Images",
    "category": "Import-Export",
}

import bpy
from bpy.types import Operator
import mathutils
import os
import collections

from bpy.props import (StringProperty,
                       BoolProperty,
                       EnumProperty,
                       IntProperty,
                       FloatProperty,
                       CollectionProperty,
                       )

from bpy_extras.object_utils import AddObjectHelper, object_data_add
from bpy_extras.image_utils import load_image

# -----------------------------------------------------------------------------
# Global Vars

DEFAULT_EXT = "*"

EXT_FILTER = getattr(collections, "OrderedDict", dict)((
    (DEFAULT_EXT, ((), "All image formats", "Import all known image (or movie) formats.")),
    ("jpeg", (("jpeg", "jpg", "jpe"), "JPEG ({})", "Joint Photographic Experts Group")),
    ("png", (("png", ), "PNG ({})", "Portable Network Graphics")),
    ("tga", (("tga", "tpic"), "Truevision TGA ({})", "")),
    ("tiff", (("tiff", "tif"), "TIFF ({})", "Tagged Image File Format")),
    ("bmp", (("bmp", "dib"), "BMP ({})", "Windows Bitmap")),
    ("cin", (("cin", ), "CIN ({})", "")),
    ("dpx", (("dpx", ), "DPX ({})", "DPX (Digital Picture Exchange)")),
    ("psd", (("psd", ), "PSD ({})", "Photoshop Document")),
    ("exr", (("exr", ), "OpenEXR ({})", "OpenEXR HDR imaging image file format")),
    ("hdr", (("hdr", "pic"), "Radiance HDR ({})", "")),
    ("avi", (("avi", ), "AVI ({})", "Audio Video Interleave")),
    ("mov", (("mov", "qt"), "QuickTime ({})", "")),
    ("mp4", (("mp4", ), "MPEG-4 ({})", "MPEG-4 Part 14")),
    ("ogg", (("ogg", "ogv"), "OGG Theora ({})", "")),
))

# XXX Hack to avoid allowing videos with Cycles, crashes currently!
VID_EXT_FILTER = {e for ext_k, ext_v in EXT_FILTER.items() if ext_k in {"avi", "mov", "mp4", "ogg"} for e in ext_v[0]}

CYCLES_SHADERS = (
    ('BSDF_DIFFUSE', "Diffuse", "Diffuse Shader"),
    ('EMISSION', "Emission", "Emission Shader"),
    ('BSDF_DIFFUSE_BSDF_TRANSPARENT', "Diffuse & Transparent", "Diffuse and Transparent Mix"),
    ('EMISSION_BSDF_TRANSPARENT', "Emission & Transparent", "Emission and Transparent Mix")
)

# -----------------------------------------------------------------------------
# Misc utils.
def gen_ext_filter_ui_items():
    return tuple((k, name.format(", ".join("." + e for e in exts)) if "{}" in name else name, desc)
                 for k, (exts, name, desc) in EXT_FILTER.items())


def is_image_fn(fn, ext_key):
    if ext_key == DEFAULT_EXT:
        return True  # Using Blender's image/movie filter.
    ext = os.path.splitext(fn)[1].lstrip(".").lower()
    return ext in EXT_FILTER[ext_key][0]


# -----------------------------------------------------------------------------
# Cycles utils.
def get_input_nodes(node, nodes, links):
    # Get all links going to node.
    input_links = {lnk for lnk in links if lnk.to_node == node}
    # Sort those links, get their input nodes (and avoid doubles!).
    sorted_nodes = []
    done_nodes = set()
    for socket in node.inputs:
        done_links = set()
        for link in input_links:
            nd = link.from_node
            if nd in done_nodes:
                # Node already treated!
                done_links.add(link)
            elif link.to_socket == socket:
                sorted_nodes.append(nd)
                done_links.add(link)
                done_nodes.add(nd)
        input_links -= done_links
    return sorted_nodes


def auto_align_nodes(node_tree):
    print('\nAligning Nodes')
    x_gap = 200
    y_gap = 100
    nodes = node_tree.nodes
    links = node_tree.links
    to_node = None
    for node in nodes:
        if node.type == 'OUTPUT_MATERIAL':
            to_node = node
            break
    if not to_node:
        return  # Unlikely, but bette check anyway...

    def align(to_node, nodes, links):
        from_nodes = get_input_nodes(to_node, nodes, links)
        for i, node in enumerate(from_nodes):
            node.location.x = to_node.location.x - x_gap
            node.location.y = to_node.location.y
            node.location.y -= i * y_gap
            node.location.y += (len(from_nodes)-1) * y_gap / (len(from_nodes))
            align(node, nodes, links)

    align(to_node, nodes, links)


def clean_node_tree(node_tree):
    nodes = node_tree.nodes
    for node in nodes:
        if not node.type == 'OUTPUT_MATERIAL':
            nodes.remove(node)
    return node_tree.nodes[0]


# -----------------------------------------------------------------------------
# Operator

class IMPORT_OT_image_to_plane(Operator, AddObjectHelper):
    """Create mesh plane(s) from image files with the appropiate aspect ratio"""
    bl_idname = "import_image.to_plane"
    bl_label = "Import Images as Planes"
    bl_options = {'REGISTER', 'UNDO'}

    # -----------
    # File props.
    files = CollectionProperty(type=bpy.types.OperatorFileListElement, options={'HIDDEN', 'SKIP_SAVE'})

    directory = StringProperty(maxlen=1024, subtype='FILE_PATH', options={'HIDDEN', 'SKIP_SAVE'})

    # Show only images/videos, and directories!
    filter_image = BoolProperty(default=True, options={'HIDDEN', 'SKIP_SAVE'})
    filter_movie = BoolProperty(default=True, options={'HIDDEN', 'SKIP_SAVE'})
    filter_folder = BoolProperty(default=True, options={'HIDDEN', 'SKIP_SAVE'})
    filter_glob = StringProperty(default="", options={'HIDDEN', 'SKIP_SAVE'})

    # --------
    # Options.
    align = BoolProperty(name="Align Planes", default=True, description="Create Planes in a row")

    align_offset = FloatProperty(name="Offset", min=0, soft_min=0, default=0.1, description="Space between Planes")

    # Callback which will update File window's filter options accordingly to extension setting.
    def update_extensions(self, context):
        is_cycles = context.scene.render.engine == 'CYCLES'
        if self.extension == DEFAULT_EXT:
            self.filter_image = True
            # XXX Hack to avoid allowing videos with Cycles, crashes currently!
            self.filter_movie = True and not is_cycles
            self.filter_glob = ""
        else:
            self.filter_image = False
            self.filter_movie = False
            if is_cycles:
                # XXX Hack to avoid allowing videos with Cycles!
                flt = ";".join(("*." + e for e in EXT_FILTER[self.extension][0] if e not in VID_EXT_FILTER))
            else:
                flt = ";".join(("*." + e for e in EXT_FILTER[self.extension][0]))
            self.filter_glob = flt
        # And now update space (file select window), if possible.
        space = bpy.context.space_data
        # XXX Can't use direct op comparison, these are not the same objects!
        if (space.type != 'FILE_BROWSER' or space.operator.bl_rna.identifier != self.bl_rna.identifier):
            return
        space.params.use_filter_image = self.filter_image
        space.params.use_filter_movie = self.filter_movie
        space.params.filter_glob = self.filter_glob
        # XXX Seems to be necessary, else not all changes above take effect...
        bpy.ops.file.refresh()
    extension = EnumProperty(name="Extension", items=gen_ext_filter_ui_items(),
                             description="Only import files of this type", update=update_extensions)

    # -------------------
    # Plane size options.
    _size_modes = (
        ('ABSOLUTE', "Absolute", "Use absolute size"),
        ('DPI', "Dpi", "Use definition of the image as dots per inch"),
        ('DPBU', "Dots/BU", "Use definition of the image as dots per Blender Unit"),
    )
    size_mode = EnumProperty(name="Size Mode", default='ABSOLUTE', items=_size_modes,
                             description="How the size of the plane is computed")

    height = FloatProperty(name="Height", description="Height of the created plane",
                           default=1.0, min=0.001, soft_min=0.001, subtype='DISTANCE', unit='LENGTH')

    factor = FloatProperty(name="Definition", min=1.0, default=600.0,
                           description="Number of pixels per inch or Blender Unit")

    # -------------------------
    # Blender material options.
    t = bpy.types.Material.bl_rna.properties["use_shadeless"]
    use_shadeless = BoolProperty(name=t.name, default=False, description=t.description)

    use_transparency = BoolProperty(name="Use Alpha", default=False, description="Use alphachannel for transparency")

    t = bpy.types.Material.bl_rna.properties["transparency_method"]
    items = tuple((it.identifier, it.name, it.description) for it in t.enum_items)
    transparency_method = EnumProperty(name="Transp. Method", description=t.description, items=items)

    t = bpy.types.Material.bl_rna.properties["use_transparent_shadows"]
    use_transparent_shadows = BoolProperty(name=t.name, default=False, description=t.description)

    #-------------------------
    # Cycles material options.
    shader = EnumProperty(name="Shader", items=CYCLES_SHADERS, description="Node shader to use")

    overwrite_node_tree = BoolProperty(name="Overwrite Material", default=True,
                                       description="Overwrite existing Material with new nodetree "
                                                   "(based on material name)")

    # --------------
    # Image Options.
    t = bpy.types.Image.bl_rna.properties["alpha_mode"]
    alpha_mode_items = tuple((e.identifier, e.name, e.description) for e in t.enum_items)
    alpha_mode = EnumProperty(name=t.name, items=alpha_mode_items, default=t.default, description=t.description)

    t = bpy.types.IMAGE_OT_match_movie_length.bl_rna
    match_len = BoolProperty(name=t.name, default=True, description=t.description)

    t = bpy.types.Image.bl_rna.properties["use_fields"]
    use_fields = BoolProperty(name=t.name, default=False, description=t.description)

    t = bpy.types.ImageUser.bl_rna.properties["use_auto_refresh"]
    use_auto_refresh = BoolProperty(name=t.name, default=True, description=t.description)

    relative = BoolProperty(name="Relative", default=True, description="Apply relative paths")

    def draw(self, context):
        engine = context.scene.render.engine
        layout = self.layout

        box = layout.box()
        box.label("Import Options:", icon='FILTER')
        box.prop(self, "extension", icon='FILE_IMAGE')
        box.prop(self, "align")
        box.prop(self, "align_offset")

        row = box.row()
        row.active = bpy.data.is_saved
        row.prop(self, "relative")
        # XXX Hack to avoid allowing videos with Cycles, crashes currently!
        if engine == 'BLENDER_RENDER':
            box.prop(self, "match_len")
            box.prop(self, "use_fields")
            box.prop(self, "use_auto_refresh")

        box = layout.box()
        if engine == 'BLENDER_RENDER':
            box.label("Material Settings: (Blender)", icon='MATERIAL')
            box.prop(self, "use_shadeless")
            box.prop(self, "use_transparency")
            box.prop(self, "alpha_mode")
            row = box.row()
            row.prop(self, "transparency_method", expand=True)
            box.prop(self, "use_transparent_shadows")
        elif engine == 'CYCLES':
            box = layout.box()
            box.label("Material Settings: (Cycles)", icon='MATERIAL')
            box.prop(self, 'shader', expand = True)
            box.prop(self, 'overwrite_node_tree')

        box = layout.box()
        box.label("Plane dimensions:", icon='ARROW_LEFTRIGHT')
        row = box.row()
        row.prop(self, "size_mode", expand=True)
        if self.size_mode == 'ABSOLUTE':
            box.prop(self, "height")
        else:
            box.prop(self, "factor")

    def invoke(self, context, event):
        self.update_extensions(context)
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

    def execute(self, context):
        if not bpy.data.is_saved:
            self.relative = False

        # the add utils don't work in this case because many objects are added disable relevant things beforehand
        editmode = context.user_preferences.edit.use_enter_edit_mode
        context.user_preferences.edit.use_enter_edit_mode = False
        if context.active_object and context.active_object.mode == 'EDIT':
            bpy.ops.object.mode_set(mode='OBJECT')

        self.import_images(context)

        context.user_preferences.edit.use_enter_edit_mode = editmode
        return {'FINISHED'}

    # Main...
    def import_images(self, context):
        engine = context.scene.render.engine
        import_list, directory = self.generate_paths()

        images = (load_image(path, directory) for path in import_list)

        if engine in {'BLENDER_RENDER', 'BLENDER_GAME'}:
            textures = []
            for img in images:
                self.set_image_options(img)
                textures.append(self.create_image_textures(context, img))

            materials = (self.create_material_for_texture(tex) for tex in textures)
        elif engine == 'CYCLES':
            materials = (self.create_cycles_material(img) for img in images)
        else:
            return

        planes = tuple(self.create_image_plane(context, mat) for mat in materials)

        context.scene.update()
        if self.align:
            self.align_planes(planes)

        for plane in planes:
            plane.select = True

        self.report({'INFO'}, "Added {} Image Plane(s)".format(len(planes)))

    def create_image_plane(self, context, material):
        engine = context.scene.render.engine
        if engine in {'BLENDER_RENDER', 'BLENDER_GAME'}:
            img = material.texture_slots[0].texture.image
        elif engine == 'CYCLES':
            nodes = material.node_tree.nodes
            img = next((node.image for node in nodes if node.type == 'TEX_IMAGE'))
        px, py = img.size

        # can't load data
        if px == 0 or py == 0:
            px = py = 1

        if self.size_mode == 'ABSOLUTE':
            y = self.height
            x = px / py * y
        elif self.size_mode == 'DPI':
            fact = 1 / self.factor / context.scene.unit_settings.scale_length * 0.0254
            x = px * fact
            y = py * fact
        else:  # elif self.size_mode == 'DPBU'
            fact = 1 / self.factor
            x = px * fact
            y = py * fact

        bpy.ops.mesh.primitive_plane_add('INVOKE_REGION_WIN')
        plane = context.scene.objects.active
        # Why does mesh.primitive_plane_add leave the object in edit mode???
        if plane.mode is not 'OBJECT':
            bpy.ops.object.mode_set(mode='OBJECT')
        plane.dimensions = x, y, 0.0
        plane.name = material.name
        bpy.ops.object.transform_apply(scale=True)
        plane.data.uv_textures.new()
        plane.data.materials.append(material)
        plane.data.uv_textures[0].data[0].image = img

        material.game_settings.use_backface_culling = False
        material.game_settings.alpha_blend = 'ALPHA'
        return plane

    def align_planes(self, planes):
        gap = self.align_offset
        offset = 0
        for i, plane in enumerate(planes):
            offset += (plane.dimensions.x / 2.0) + gap
            if i == 0:
                continue
            move_local = mathutils.Vector((offset, 0.0, 0.0))
            move_world = plane.location + move_local * plane.matrix_world.inverted()
            plane.location += move_world
            offset += (plane.dimensions.x / 2.0)

    def generate_paths(self):
        return (fn.name for fn in self.files if is_image_fn(fn.name, self.extension)), self.directory

    # Internal
    def create_image_textures(self, context, image):
        fn_full = os.path.normpath(bpy.path.abspath(image.filepath))

        # look for texture with importsettings
        for texture in bpy.data.textures:
            if texture.type == 'IMAGE':
                tex_img = texture.image
                if (tex_img is not None) and (tex_img.library is None):
                    fn_tex_full = os.path.normpath(bpy.path.abspath(tex_img.filepath))
                    if fn_full == fn_tex_full:
                        self.set_texture_options(context, texture)
                        return texture

        # if no texture is found: create one
        name_compat = bpy.path.display_name_from_filepath(image.filepath)
        texture = bpy.data.textures.new(name=name_compat, type='IMAGE')
        texture.image = image
        self.set_texture_options(context, texture)
        return texture

    def create_material_for_texture(self, texture):
        # look for material with the needed texture
        for material in bpy.data.materials:
            slot = material.texture_slots[0]
            if slot and slot.texture == texture:
                self.set_material_options(material, slot)
                return material

        # if no material found: create one
        name_compat = bpy.path.display_name_from_filepath(texture.image.filepath)
        material = bpy.data.materials.new(name=name_compat)
        slot = material.texture_slots.add()
        slot.texture = texture
        slot.texture_coords = 'UV'
        self.set_material_options(material, slot)
        return material

    def set_image_options(self, image):
        image.alpha_mode = self.alpha_mode
        image.use_fields = self.use_fields

        if self.relative:
            try:  # can't always find the relative path (between drive letters on windows)
                image.filepath = bpy.path.relpath(image.filepath)
            except ValueError:
                pass

    def set_texture_options(self, context, texture):
        texture.image.use_alpha = self.use_transparency
        texture.image_user.use_auto_refresh = self.use_auto_refresh
        if self.match_len:
            ctx = context.copy()
            ctx["edit_image"] = texture.image
            ctx["edit_image_user"] = texture.image_user
            bpy.ops.image.match_movie_length(ctx)

    def set_material_options(self, material, slot):
        if self.use_transparency:
            material.alpha = 0.0
            material.specular_alpha = 0.0
            slot.use_map_alpha = True
        else:
            material.alpha = 1.0
            material.specular_alpha = 1.0
            slot.use_map_alpha = False
        material.use_transparency = self.use_transparency
        material.transparency_method = self.transparency_method
        material.use_shadeless = self.use_shadeless
        material.use_transparent_shadows = self.use_transparent_shadows

    #--------------------------------------------------------------------------
    # Cycles
    def create_cycles_material(self, image):
        name_compat = bpy.path.display_name_from_filepath(image.filepath)
        material = None
        for mat in bpy.data.materials:
            if mat.name == name_compat and self.overwrite_node_tree:
                material = mat
        if not material:
            material = bpy.data.materials.new(name=name_compat)

        material.use_nodes = True
        node_tree = material.node_tree
        out_node = clean_node_tree(node_tree)

        if self.shader == 'BSDF_DIFFUSE':
            bsdf_diffuse = node_tree.nodes.new('ShaderNodeBsdfDiffuse')
            tex_image = node_tree.nodes.new('ShaderNodeTexImage')
            tex_image.image = image
            tex_image.show_texture = True
            node_tree.links.new(out_node.inputs[0], bsdf_diffuse.outputs[0])
            node_tree.links.new(bsdf_diffuse.inputs[0], tex_image.outputs[0])

        elif self.shader == 'EMISSION':
            emission = node_tree.nodes.new('ShaderNodeEmission')
            lightpath = node_tree.nodes.new('ShaderNodeLightPath')
            tex_image = node_tree.nodes.new('ShaderNodeTexImage')
            tex_image.image = image
            tex_image.show_texture = True
            node_tree.links.new(out_node.inputs[0], emission.outputs[0])
            node_tree.links.new(emission.inputs[0], tex_image.outputs[0])
            node_tree.links.new(emission.inputs[1], lightpath.outputs[0])

        elif self.shader == 'BSDF_DIFFUSE_BSDF_TRANSPARENT':
            bsdf_diffuse = node_tree.nodes.new('ShaderNodeBsdfDiffuse')
            bsdf_transparent = node_tree.nodes.new('ShaderNodeBsdfTransparent')
            mix_shader = node_tree.nodes.new('ShaderNodeMixShader')
            tex_image = node_tree.nodes.new('ShaderNodeTexImage')
            tex_image.image = image
            tex_image.show_texture = True
            node_tree.links.new(out_node.inputs[0], mix_shader.outputs[0])
            node_tree.links.new(mix_shader.inputs[0], tex_image.outputs[1])
            node_tree.links.new(mix_shader.inputs[2], bsdf_diffuse.outputs[0])
            node_tree.links.new(mix_shader.inputs[1], bsdf_transparent.outputs[0])
            node_tree.links.new(bsdf_diffuse.inputs[0], tex_image.outputs[0])

        elif self.shader == 'EMISSION_BSDF_TRANSPARENT':
            emission = node_tree.nodes.new('ShaderNodeEmission')
            lightpath = node_tree.nodes.new('ShaderNodeLightPath')
            bsdf_transparent = node_tree.nodes.new('ShaderNodeBsdfTransparent')
            mix_shader = node_tree.nodes.new('ShaderNodeMixShader')
            tex_image = node_tree.nodes.new('ShaderNodeTexImage')
            tex_image.image = image
            tex_image.show_texture = True
            node_tree.links.new(out_node.inputs[0], mix_shader.outputs[0])
            node_tree.links.new(mix_shader.inputs[0], tex_image.outputs[1])
            node_tree.links.new(mix_shader.inputs[2], emission.outputs[0])
            node_tree.links.new(mix_shader.inputs[1], bsdf_transparent.outputs[0])
            node_tree.links.new(emission.inputs[0], tex_image.outputs[0])
            node_tree.links.new(emission.inputs[1], lightpath.outputs[0])

        auto_align_nodes(node_tree)
        return material


# -----------------------------------------------------------------------------
# Register
def import_images_button(self, context):
    self.layout.operator(IMPORT_OT_image_to_plane.bl_idname,
                         text="Images as Planes", icon='TEXTURE')


def register():
    bpy.utils.register_module(__name__)
    bpy.types.INFO_MT_file_import.append(import_images_button)
    bpy.types.INFO_MT_mesh_add.append(import_images_button)


def unregister():
    bpy.utils.unregister_module(__name__)
    bpy.types.INFO_MT_file_import.remove(import_images_button)
    bpy.types.INFO_MT_mesh_add.remove(import_images_button)


if __name__ == "__main__":
    register()
