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Merge pull request #33 from azagaya/master

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Added custom blend function to workarround godot's blend rect issue
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Overloaded 2019-12-03 18:42:03 +02:00 committed by GitHub
parent 9102614a0c ea09dfddfb
commit 2a57ec5f57
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1 changed files with 21 additions and 5 deletions
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26
Scripts/Canvas.gd
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@ -548,15 +548,15 @@ func draw_pixel(pos : Vector2, color : Color, current_mouse_button : String, cur
mirror_x -= 1
if int(pos_rect_clipped.size.y) % 2 != 0:
mirror_y -= 1
# Use custom blend function cause of godot's issue #31124
if color.a > 0: #If it's the pencil
layers[current_layer_index][0].blend_rect(custom_brush_image, src_rect, dst)
blend_rect(layers[current_layer_index][0], custom_brush_image, dst)
if horizontal_mirror:
layers[current_layer_index][0].blend_rect(custom_brush_image, src_rect, Vector2(mirror_x, dst.y))
blend_rect(layers[current_layer_index][0], custom_brush_image, Vector2(mirror_x, dst.y))
if vertical_mirror:
layers[current_layer_index][0].blend_rect(custom_brush_image, src_rect, Vector2(dst.x, mirror_y))
blend_rect(layers[current_layer_index][0], custom_brush_image, Vector2(dst.x, mirror_y))
if horizontal_mirror && vertical_mirror:
layers[current_layer_index][0].blend_rect(custom_brush_image, src_rect, Vector2(mirror_x, mirror_y))
blend_rect(layers[current_layer_index][0], custom_brush_image, Vector2(mirror_x, mirror_y))
else: #if it's transparent - if it's the eraser
var custom_brush := Image.new()
@ -660,3 +660,19 @@ func rectangle_center(rect_position : Vector2, rect_size : Vector2) -> Vector2:
func _on_Timer_timeout() -> void:
Global.can_draw = true
# Custom blend rect function, needed because godot's issue #31124
func blend_rect(bg : Image, brush : Image, dst : Vector2):
var brush_size := brush.get_size()
for x in range(0, brush_size.x):
for y in range(0, brush_size.y):
var out_color := Color()
var brush_color := brush.get_pixel(x, y)
var bg_color := bg.get_pixel(x + dst.x, y + dst.y)
out_color.a = brush_color.a + bg_color.a * (1 - brush_color.a)
# blend the colors
if out_color.a != 0:
out_color.r = (brush_color.r * brush_color.a + bg_color.r * bg_color.a * (1 - brush_color.a)) / out_color.a
out_color.g = (brush_color.g * brush_color.a + bg_color.g * bg_color.a * (1 - brush_color.a)) / out_color.a
out_color.b = (brush_color.b * brush_color.a + bg_color.b * bg_color.a * (1 - brush_color.a)) / out_color.a
bg.set_pixel(x + dst.x, y + dst.y, out_color)