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Copy pathoperators_export.py
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201 lines (169 loc) · 7.37 KB
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import os
import tempfile
from pathlib import Path
import bpy
from bpy_extras.io_utils import ExportHelper
from bpy.props import StringProperty
from . import page_manager, sheet_composer
from .pdf_writer import JPEGPage, write_jpeg_pdf
def _set_if_available(owner, name, value):
if not hasattr(owner, name):
return
try:
setattr(owner, name, value)
except (TypeError, ValueError, AttributeError):
pass
def _snapshot_render(scene):
render = scene.render
image = render.image_settings
return {
"camera": scene.camera,
"engine": render.engine,
"filepath": render.filepath,
"resolution_x": render.resolution_x,
"resolution_y": render.resolution_y,
"resolution_percentage": render.resolution_percentage,
"film_transparent": render.film_transparent,
"file_format": image.file_format,
"color_mode": image.color_mode,
"quality": image.quality,
}
def _restore_render(scene, state):
render = scene.render
image = render.image_settings
scene.camera = state["camera"]
render.engine = state["engine"]
render.filepath = state["filepath"]
render.resolution_x = state["resolution_x"]
render.resolution_y = state["resolution_y"]
render.resolution_percentage = state["resolution_percentage"]
render.film_transparent = state["film_transparent"]
image.file_format = state["file_format"]
image.color_mode = state["color_mode"]
image.quality = state["quality"]
def _create_export_camera(scene, sheet_width, sheet_height, pixel_width, pixel_height):
camera_data = bpy.data.cameras.new("GP_PDF_TEMP_CAMERA")
camera_data.type = 'ORTHO'
# Blender's orthographic camera scale describes the horizontal width
# of the camera frame. The vertical coverage is ortho_scale / aspect.
# Therefore fit the sheet width directly, and enlarge it when the sheet
# height would otherwise exceed the vertical coverage. The previous
# height-based formula cropped wide brochures to roughly their centre
# panel and then stretched that render across the PDF page.
render_aspect = max(1.0e-9, float(pixel_width) / float(pixel_height))
required_scale_for_width = sheet_width
required_scale_for_height = sheet_height * render_aspect
camera_data.ortho_scale = max(required_scale_for_width, required_scale_for_height) * 1.02
camera_data.shift_x = 0.0
camera_data.shift_y = 0.0
camera_data.clip_start = 0.001
camera_data.clip_end = 100.0
camera = bpy.data.objects.new("GP_PDF_TEMP_CAMERA", camera_data)
camera.location = (0.0, 0.0, 10.0)
camera.rotation_euler = (0.0, 0.0, 0.0)
scene.collection.objects.link(camera)
scene.camera = camera
return camera, camera_data
def _configure_workbench(scene):
scene.render.engine = 'BLENDER_WORKBENCH'
shading = scene.display.shading
_set_if_available(shading, "light", 'FLAT')
_set_if_available(shading, "color_type", 'TEXTURE')
_set_if_available(shading, "background_type", 'VIEWPORT')
_set_if_available(shading, "background_color", (1.0, 1.0, 1.0))
_set_if_available(shading, "show_shadows", False)
_set_if_available(shading, "show_cavity", False)
_set_if_available(shading, "show_specular_highlight", False)
_set_if_available(shading, "show_outline", False)
def _render_sides(scene, temp_dir, dpi, quality):
sides = sheet_composer.side_collections(scene)
if not sides:
sheet_composer.generate_sides(scene)
sides = sheet_composer.side_collections(scene)
if not sides:
raise RuntimeError("No generated sides")
width_mm = float(sides[0].get("sheet_width_mm", 0.0))
height_mm = float(sides[0].get("sheet_height_mm", 0.0))
if width_mm <= 0 or height_mm <= 0:
raise RuntimeError("Invalid side dimensions")
width_px = max(64, round(width_mm / 25.4 * dpi))
height_px = max(64, round(height_mm / 25.4 * dpi))
camera, camera_data = _create_export_camera(scene, width_mm / 1000.0, height_mm / 1000.0, width_px, height_px)
render = scene.render
render.resolution_x = width_px
render.resolution_y = height_px
render.resolution_percentage = 100
render.film_transparent = False
render.image_settings.file_format = 'JPEG'
render.image_settings.color_mode = 'RGB'
render.image_settings.quality = quality
render.use_file_extension = True
_configure_workbench(scene)
pages = []
try:
for index, side in enumerate(sides):
sheet_composer.show_side(scene, index)
filepath = os.path.join(temp_dir, f"side_{index + 1:04d}.jpg")
render.filepath = filepath
bpy.ops.render.render(write_still=True)
if not os.path.isfile(filepath):
raise RuntimeError(f"Render side {index + 1} not created")
pages.append(JPEGPage(filepath, width_px, height_px))
finally:
bpy.data.objects.remove(camera, do_unlink=True)
if camera_data.users == 0:
bpy.data.cameras.remove(camera_data)
return pages, width_mm, height_mm
class EDITORIALGP_OT_export_imposed_pdf(bpy.types.Operator, ExportHelper):
bl_idname = "editorial_gp.export_imposed_pdf"
bl_label = "Export Imposed PDF"
bl_description = "Export all generated sides to an imposed multi-page PDF"
filename_ext = ".pdf"
filter_glob: StringProperty(default="*.pdf", options={'HIDDEN'})
def invoke(self, context, event):
settings = context.scene.editorial_gp
if settings.pdf_output_path:
self.filepath = bpy.path.abspath(settings.pdf_output_path)
elif bpy.data.filepath:
self.filepath = str(Path(bpy.data.filepath).with_suffix("")) + "_imposto.pdf"
else:
self.filepath = "GreasePress_imposto.pdf"
return super().invoke(context, event)
def execute(self, context):
scene = context.scene
settings = scene.editorial_gp
output_path = bpy.path.abspath(self.filepath)
if not output_path.lower().endswith('.pdf'):
output_path += '.pdf'
state = _snapshot_render(scene)
previous_side = settings.current_sheet_side
had_sides = bool(sheet_composer.side_collections(scene))
try:
with tempfile.TemporaryDirectory(prefix="greasepress_pdf_") as temp_dir:
pages, width_mm, height_mm = _render_sides(
scene, temp_dir, int(settings.pdf_dpi), settings.pdf_jpeg_quality
)
write_jpeg_pdf(
output_path, pages, width_mm, height_mm,
title=f"{settings.document_name} — Imposed PDF",
)
except Exception as exc:
self.report({'ERROR'}, f"PDF export failed: {exc}")
return {'CANCELLED'}
finally:
_restore_render(scene, state)
sides = sheet_composer.side_collections(scene)
if sides:
sheet_composer.show_side(scene, min(previous_side, len(sides) - 1))
else:
sheet_composer.return_to_pages(scene)
settings.pdf_output_path = output_path
self.report({'INFO'}, f"Imposed PDF exported: {output_path}")
return {'FINISHED'}
classes = (EDITORIALGP_OT_export_imposed_pdf,)
def register():
for cls in classes:
bpy.utils.register_class(cls)
def unregister():
for cls in reversed(classes):
bpy.utils.unregister_class(cls)