PIL Image Kiva Backend

enable/gcbench/bench.py

@@ -25,6 +25,7 @@
         "blend2d": "enable.null.blend2d",
         "cairo": "enable.null.cairo",
         "celiagg": "enable.null.celiagg",
+        "pil_image": "enable.null.pil_image",
         "qpainter": "enable.null.qpainter",
         "quartz": "enable.null.quartz",
     },

enable/null/pil_image.py

@@ -0,0 +1,26 @@
+# (C) Copyright 2005-2022 Enthought, Inc., Austin, TX
+# All rights reserved.
+#
+# This software is provided without warranty under the terms of the BSD
+# license included in LICENSE.txt and may be redistributed only under
+# the conditions described in the aforementioned license. The license
+# is also available online at http://www.enthought.com/licenses/BSD.txt
+#
+# Thanks for using Enthought open source!
+from kiva.pil_image import CompiledPath, GraphicsContext  # noqa
+
+
+class NativeScrollBar(object):
+    pass
+
+
+class Window(object):
+    pass
+
+
+def font_metrics_provider():
+    from kiva.api import Font
+
+    gc = GraphicsContext((1, 1))
+    gc.set_font(Font())
+    return gc

enable/qt4/pil_image.py

@@ -0,0 +1,78 @@
+# (C) Copyright 2005-2022 Enthought, Inc., Austin, TX
+# All rights reserved.
+#
+# This software is provided without warranty under the terms of the BSD
+# license included in LICENSE.txt and may be redistributed only under
+# the conditions described in the aforementioned license. The license
+# is also available online at http://www.enthought.com/licenses/BSD.txt
+#
+# Thanks for using Enthought open source!
+
+import numpy as np
+from kiva.pil_image import CompiledPath, GraphicsContext  # noqa
+from pyface.qt import QtCore, QtGui
+from traits.api import Array
+
+from .base_window import BaseWindow
+from .scrollbar import NativeScrollBar  # noqa
+
+
+class Window(BaseWindow):
+    # Keep a buffer around for converting RGBA -> BGRA
+    _shuffle_buffer = Array(shape=(None, None, 4), dtype=np.uint8)
+
+    def _create_gc(self, size, pix_format="rgba32"):
+        gc = GraphicsContext(
+            (size[0] + 1, size[1] + 1),
+            pix_format=pix_format,
+            base_pixel_scale=self.base_pixel_scale,
+        )
+        gc.translate_ctm(0.5, 0.5)
+
+        self._shuffle_buffer = np.empty(
+            (size[1] + 1, size[0] + 1, 4), dtype=np.uint8
+        )
+
+        return gc
+
+    def _window_paint(self, event):
+        if self.control is None:
+            return
+
+        # Convert to Qt's pixel format
+        self._shuffle_copy()
+
+        # self._gc is an image context
+        w = self._gc.width()
+        h = self._gc.height()
+        image = QtGui.QImage(
+            self._shuffle_buffer, w, h, QtGui.QImage.Format_RGB32
+        )
+        rect = QtCore.QRectF(
+            0, 0, w / self._gc.base_scale, h / self._gc.base_scale
+        )
+        painter = QtGui.QPainter(self.control)
+        painter.drawImage(rect, image)
+
+    def _shuffle_copy(self):
+        """ Convert from RGBA -> BGRA.
+        Supported source formats are: rgb24, rgba32, & bgra32
+
+        Qt's Format_RGB32 is actually BGR. So, Yeah...
+        """
+        src = np.array(self._gc.image)
+        dst = self._shuffle_buffer
+
+        indices = (2, 1, 0)
+        dst[..., 0] = src[..., indices[0]]
+        dst[..., 1] = src[..., indices[1]]
+        dst[..., 2] = src[..., indices[2]]
+        dst[..., 3] = src[..., 3]
+
+
+def font_metrics_provider():
+    from kiva.api import Font
+
+    gc = GraphicsContext((1, 1))
+    gc.set_font(Font())
+    return gc

enable/wx/pil_image.py

@@ -0,0 +1,50 @@
+# (C) Copyright 2005-2022 Enthought, Inc., Austin, TX
+# All rights reserved.
+#
+# This software is provided without warranty under the terms of the BSD
+# license included in LICENSE.txt and may be redistributed only under
+# the conditions described in the aforementioned license. The license
+# is also available online at http://www.enthought.com/licenses/BSD.txt
+#
+# Thanks for using Enthought open source!
+
+import numpy as np
+import wx
+
+from kiva.pil_image import CompiledPath, GraphicsContext  # noqa
+
+from .base_window import BaseWindow
+from .scrollbar import NativeScrollBar
+
+
+class Window(BaseWindow):
+    def _create_gc(self, size, pix_format="bgra32"):
+        gc = GraphicsContext(
+            (size[0] + 1, size[1] + 1),
+            base_pixel_scale=self.base_pixel_scale,
+        )
+        gc.translate_ctm(0.5, 0.5)
+        return gc
+
+    def _window_paint(self, event):
+        if self.control is None:
+            event.Skip()
+            return
+
+        control = self.control
+        wdc = control._dc = wx.PaintDC(control)
+
+        bmp = wx.Bitmap.FromBufferRGBA(
+            self._gc.width(), self._gc.height(), self._gc.image.tobytes()
+        )
+        wdc.DrawBitmap(bmp, 0, 0)
+
+        control._dc = None
+
+
+def font_metrics_provider():
+    from kiva.api import Font
+
+    gc = GraphicsContext((1, 1))
+    gc.set_font(Font())
+    return gc

kiva/basecore2d.py

@@ -1218,7 +1218,8 @@ def device_transform_device_ctm(self, func, args):
         elif func == CONCAT_CTM:
             self.device_ctm = affine.concat(self.device_ctm, args[0])
         elif func == LOAD_CTM:
-            self.device_ctm = args[0].copy()
+            self.device_prepare_device_ctm()
+            self.device_ctm = affine.concat(self.device_ctm, args[0])
 
     def device_draw_rect(self, x, y, sx, sy, mode):
         """ Default implementation of drawing  a rect.