Various bugfixes & usability improvements.

1) Backend: initial optimised cell rendering Python C module implementation skeleton.
2) Backend: raise alpha blending {fore,back}ground colour coefficient to {0.8,1.0 - 0.8}, resp.
3) Backend: reimplement cell rendering using Draw{Rectangle,Text}List().
4) Canvas window: eliminate {canvas,{scroll,tool}bar} flickering during resize.
5) Canvas window: fix cursor artifacts during resizing by masking cursor.
6) Canvas window: restore cursor after executing operations that remove it.
7) Import store: correctly parse non-conforming \u0003,<bg colour> sequences.
8) GUI: correctly save list of recently used files post-update.

.gitignore

@@ -1,5 +1,9 @@
 *.sw[op]
 __pycache__/
 build/
+libgui/GuiCanvasWxBackendFast.exp
+libgui/GuiCanvasWxBackendFast.lib
+libgui/GuiCanvasWxBackendFast.obj
+libgui/GuiCanvasWxBackendFast.pyd
 librtl/ImgurApiKey.py
 releases/

.vscode/c_cpp_properties.json

@@ -0,0 +1,23 @@
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "C:/Python37/include/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "windowsSdkVersion": "10.0.18362.0",
+            "compilerPath": "C:/Program Files (x86)/Microsoft Visual Studio/2019/BuildTools/VC/Tools/MSVC/14.23.28105/bin/Hostx64/x64/cl.exe",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "msvc-x64",
+            "compilerArgs": []
+        }
+    ],
+    "version": 4
+}

.vscode/settings.json

@@ -1,4 +1,5 @@
 {
+        "python.analysis.disabled": ["unresolved-import"],
         "python.pythonPath": "C:\\Python37\\python.exe",
         "python.linting.enabled": false
 }

.vscode/tasks.json

@@ -4,9 +4,12 @@
         "version": "2.0.0",
         "tasks": [
                 {
-                        "label": "echo",
+                        "label": "Build libgui/GuiCanvasWxBackendFast.pyd",
                         "type": "shell",
-                        "command": "echo Hello"
+                        "command": "cd \"${workspaceFolder}/libgui\" && cmd /c cl /LD /IC:/Python37/include GuiCanvasWxBackendFast.c C:/Python37/libs/python37.lib /FeGuiCanvasWxBackendFast.pyd",
+                        "problemMatcher": [
+                                "$msCompile"
+                        ]
                 }
         ]
 }

assets/text/TODO

@@ -1,25 +1,20 @@
 1)  ANSI CSI CU[BDPU] sequences
-2)  Fix & finish Arabic/RTL text tool support
 3)  Documentation, instrumentation & unit tests
 4)  Layers & layout (e.g. for comics, zines, etc.)
 5)  Open and toggle a reference image in the background
 6)  Client-Server or Peer-to-Peer realtime collaboration
 7)  Arbitrary {format,palette}s ({4,8} bit ANSI/mIRC, etc.)
-8)  {record,replay} {keyboard,mouse,...} events in debugging builds
-9)  Unit tools: arrow, {cloud,speech bubble}, curve, measure, polygon, triangle
+8)  Unit tools: arrow, {cloud,speech bubble}, curve, polygon
+9)  {record,replay} {keyboard,mouse,...} events in debugging builds
 10) Integrate ENNTool code in the form of OpenGL-based animation window (see 13) and 14))
 11) Composition, parametrisation & keying of tools from higher-order operators (brushes, functions, filters, outlines, patterns & shaders) and unit tools
 12) Sprites & scripted (Python?) animation on the basis of asset traits and {composable,parametrised} patterns (metric flow, particle system, rigging, ...)
 13) GUI TODO list:
     a) switch to Gtk
-    b) https://material.io/resources/icons/?style=baseline
-    c) replace logo w/ canvas panel in About dialogue, revisit melp? dialogue
-    d) replace resize buttons w/ {-,edit box,+} buttons & lock button re: ratio (ty lol3)
-    e) Settings/Settings window (e.g. autosave, cursor opacity, hide cursor on leaving window, ...)
-
-Release roadmap:
-1)  {copy,cut,delete,insert from,paste}, edit asset in new canvas, import from {canvas,object}
-2)  operators: crop, scale, shift, slice
-3)  tools: unicode block elements
+    b) canvas preview in Open dialogue(s)
+    c) https://material.io/resources/icons/?style=baseline
+    d) replace logo w/ canvas panel in About dialogue, revisit melp? dialogue
+    e) replace resize buttons w/ {-,edit box,+} buttons & lock button re: ratio (ty lol3)
+    f) Settings/Settings window (e.g. autosave, cursor opacity, hide cursor on leaving window, ...)
 
 vim:ff=dos tw=0

assets/text/roadmap.txt

@@ -0,0 +1,13 @@
+1)  canvas: default to transparent background colour
+2)  GUI: disable tiling items unless current tool is object tool
+3)  GUI: edit asset in new canvas, import from {canvas,object}
+4)  GUI: implement GuiCanvasWxBackendFast.c{,c}
+5)  GUI: select all
+6)  GUI: show line numbers w/ either ruler or tooltip
+7)  operators: copy, cut, delete, insert from, paste
+8)  operators: crop, scale, shift, slice operators
+9)  tools: measure, triangle, unicode block elements tool
+10) tools: text tool: finish Arabic/RTL text implementation
+11) tools: text tool: implicitly draw (text) w/ bg -1, toggle drawing actual brushColours[1] mode w/ RMB
+
+vim:ff=dos tw=0

libcanvas/Canvas.py

@@ -29,7 +29,6 @@ class Canvas():
             else:
                 oldSize = self.size
             deltaSize = [b - a for a, b in zip(oldSize, newSize)]
-            self.journal.resetCursor()
             if commitUndo:
                 self.journal.begin()
                 undoPatches, redoPatches = ["resize", *oldSize], ["resize", *newSize]

libcanvas/CanvasImportStore.py

@@ -101,6 +101,8 @@ class CanvasImportStore():
                                 inCurColours = (int(m[2]), int(m[3]))
                             elif (m[2] != None) and (m[3] == None):
                                 inCurColours = (int(m[2]), int(inCurColours[1]))
+                            elif (m[2] == None) and (m[3] != None):
+                                inCurColours = (int(inCurColours[0]), int(m[3]))
                             else:
                                 inCurColours = (15, -1)
                             inCurCol += len(m[0])

libcanvas/CanvasJournal.py

@@ -15,9 +15,11 @@ class CanvasJournal():
             if self.patchesUndoLevel > 0:
                 del self.patchesUndo[:self.patchesUndoLevel]; self.patchesUndoLevel = 0;
 
-    def popCursor(self):
+    def popCursor(self, reset=True):
         if len(self.patchesCursor):
-            patchesCursor = self.patchesCursor; self.patchesCursor = [];
+            patchesCursor = self.patchesCursor
+            if reset:
+                self.resetCursor()
             return patchesCursor
         else:
             return []
@@ -40,8 +42,6 @@ class CanvasJournal():
         self.patchesCursor = patches
 
     def resetCursor(self):
-        if self.patchesCursor != None:
-            self.patchesCursor.clear()
         self.patchesCursor = []
 
     def resetUndo(self):
@@ -57,7 +57,6 @@ class CanvasJournal():
         self.resetCursor(); self.resetUndo();
 
     def __init__(self):
-        self.patchesCursor, self.patchesUndo, self. patchesUndoLevel = None, None, None
-        self.resetCursor(); self.resetUndo();
+        self.patchesUndo = None; self.resetCursor(); self.resetUndo();
 
 # vim:expandtab foldmethod=marker sw=4 ts=4 tw=120

libgui/GuiCanvasWxBackend.py

@@ -6,7 +6,8 @@
 
 from ctypes import *
 from GuiCanvasColours import Colours
-import math, os, platform, Rtl, wx
+import GuiCanvasWxBackendFast
+import math, os, platform, wx
 
 class GuiBufferedDC(wx.MemoryDC):
     def __del__(self):
@@ -70,7 +71,7 @@ class GuiCanvasWxBackend():
         CS_UNDERLINE    = 0x02
 
     def _blendColours(self, bg, fg):
-        return [int((fg * 0.75) + (bg * (1.0 - 0.75))) for bg, fg in zip(Colours[bg][:3], Colours[fg][:3])]
+        return [int((fg * 0.8) + (bg * (1.0 - 0.8))) for bg, fg in zip(Colours[bg][:3], Colours[fg][:3])]
 
     def _finiBrushesAndPens(self):
         for wxObject in Rtl.flatten([
@@ -140,24 +141,23 @@ class GuiCanvasWxBackend():
             else:
                 bg = patchBg[1] if patchBg[1] != -1 else 14
                 brush, pen = self._brushesBlend[bg][14], self._pensBlend[bg][14]
-        if self._lastBrush != brush:
-            dc.SetBrush(brush); self._lastBrush = brush;
-        if self._lastPen != pen:
-            dc.SetPen(pen); self._lastPen = pen;
         return brush, pen
 
-    def drawCursorMaskWithJournal(self, canvas, canvasJournal, eventDc):
+    def drawCursorMaskWithJournal(self, canvas, canvasJournal, eventDc, reset=True):
         eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
-        cursorCells, patches = canvasJournal.popCursor(), []
-        for cursorCell in cursorCells:
-            patches += [[*cursorCell, *canvas.map[cursorCell[1]][cursorCell[0]]]]
+        cursorPatches = canvasJournal.popCursor(reset=reset); patches = [];
+        for cursorCell in [p[:2] for p in cursorPatches]:
+            if  (cursorCell[0] < canvas.size[0])    \
+            and (cursorCell[1] < canvas.size[1]):
+                patches += [[*cursorCell, *canvas.map[cursorCell[1]][cursorCell[0]]]]
         if len(patches) > 0:
             self.drawPatches(canvas, eventDc, patches, False)
         eventDc.SetDeviceOrigin(*eventDcOrigin)
-        return cursorCells
+        return cursorPatches
 
     def drawPatches(self, canvas, eventDc, patches, isCursor=False):
-        patchCursorCells, patchesRender = [], []
+        GuiCanvasWxBackendFast.drawPatches()
+        patchesRender = []
         for patch in patches:
             point = patch[:2]
             if [(c >= 0) and (c < s) for c, s in zip(point, self.canvasSize)] == [True, True]:
@@ -166,33 +166,33 @@ class GuiCanvasWxBackend():
                         patchesRender += [patchReshaped]
                 else:
                     patchesRender += [patch]
+        numPatch, textBg = 0, wx.Colour(0, 0, 0, 0)
+        rectangles, pens, brushes = [None] * len(patchesRender), [None] * len(patchesRender), [None] * len(patchesRender)
+        textList, coords, foregrounds, backgrounds = [], [], [], []
+        eventDc.SetFont(self._font)
         for patchRender in patchesRender:
-            absPoint, charFlag = [a * b for a, b in zip(self.cellSize, patchRender[:2])], False
             if (patchRender[5] == " ") and (patchRender[3] == -1):
-                charFlag, patchRender, textFg = True, [*patchRender[:-1], "░"], wx.Colour(0, 0, 0, 255)
-            elif isCursor and (patchRender[5] == " ") and ((canvas.map[patchRender[1]][patchRender[0]][3] != " ") or (canvas.map[patchRender[1]][patchRender[0]][2] & self._CellState.CS_UNDERLINE)):
-                charFlag, patchRender = True, [*patchRender[:-2], *canvas.map[patchRender[1]][patchRender[0]][2:]]
-                textFg = wx.Colour(self._blendColours(canvas.map[patchRender[1]][patchRender[0]][0], patchRender[3]))
-            elif (patchRender[5] != " ") or (patchRender[4] & self._CellState.CS_UNDERLINE):
-                charFlag, textFg = True, wx.Colour(Colours[patchRender[2]][:4])
+                text, textFg = "░", wx.Colour(0, 0, 0, 255)
+            elif isCursor and (patchRender[5] == " ") and (canvas.map[patchRender[1]][patchRender[0]][3] != " "):
+                patchRender = [*patchRender[:-2], *canvas.map[patchRender[1]][patchRender[0]][2:]]
+                text, textFg = canvas.map[patchRender[1]][patchRender[0]][3], wx.Colour(self._blendColours(canvas.map[patchRender[1]][patchRender[0]][0], patchRender[3]))
+            elif isCursor and (patchRender[5] == " ") and (canvas.map[patchRender[1]][patchRender[0]][2] & self._CellState.CS_UNDERLINE):
+                patchRender = [*patchRender[:-2], *canvas.map[patchRender[1]][patchRender[0]][2:]]
+                text, textFg = "_", wx.Colour(self._blendColours(canvas.map[patchRender[1]][patchRender[0]][0], patchRender[3]))
+            elif patchRender[5] != " ":
+                text, textFg = patchRender[5], wx.Colour(Colours[patchRender[2]][:4])
+            elif patchRender[4] & self._CellState.CS_UNDERLINE:
+                text, textFg = "_", wx.Colour(Colours[patchRender[2]][:4])
+            else:
+                text = None
             brush, pen = self._setBrushColours(eventDc, isCursor, patchRender[2:], canvas.map[patchRender[1]][patchRender[0]])
-            eventDc.DrawRectangle(*absPoint, *self.cellSize)
-            if charFlag:
-                if (patchRender[4] & self._CellState.CS_UNDERLINE) or (patchRender[5] == "_"):
-                    if isCursor and (patchRender[5] == " ") and ((canvas.map[patchRender[1]][patchRender[0]][3] != " ") or (canvas.map[patchRender[1]][patchRender[0]][2] & self._CellState.CS_UNDERLINE)):
-                        eventDc.SetPen(self._pensBlend[patchRender[2]][patchRender[3]])
-                    else:
-                        eventDc.SetPen(self._pens[patchRender[2]])
-                    eventDc.DrawLine(absPoint[0], absPoint[1] + self.cellSize[1] - 1, absPoint[0] + self.cellSize[0], absPoint[1] + self.cellSize[1] - 1)
-                    eventDc.SetPen(pen)
-                if patchRender[5] != "_":
-                    oldClippingRegion = eventDc.GetClippingBox()
-                    eventDc.SetFont(self._font)
-                    eventDc.DestroyClippingRegion(); eventDc.SetClippingRegion(*absPoint, *self.cellSize);
-                    eventDc.SetTextForeground(textFg); eventDc.DrawText(patchRender[5], *absPoint);
-                    eventDc.DestroyClippingRegion()
-            patchCursorCells += [patchRender[:2]]
-        return patchCursorCells
+            rectangles[numPatch] = [patchRender[:2][0] * self.cellSize[0], patchRender[:2][1] * self.cellSize[1], self.cellSize[0], self.cellSize[1]];
+            pens[numPatch] = pen; brushes[numPatch] = brush;
+            if text != None:
+                textList += [text]; coords += [[patchRender[:2][0] * self.cellSize[0], patchRender[:2][1] * self.cellSize[1]]]; foregrounds += [textFg]; backgrounds += [textBg];
+            numPatch += 1
+        eventDc.DrawRectangleList(rectangles, pens, brushes)
+        eventDc.DrawTextList(textList, coords, foregrounds, backgrounds)
 
     def getDeviceContext(self, clientSize, parentWindow, viewRect=None):
         if viewRect == None:

libgui/GuiCanvasWxBackendFast.c

@@ -0,0 +1,25 @@
+#define PY_SSIZE_T_CLEAN	/* Make "s#" use Py_ssize_t rather than int. */
+#include <Python.h>
+
+static PyObject *
+GuiCanvasWxBackendFast_drawPatches(PyObject *self, PyObject *args)
+{
+	Py_RETURN_NONE;
+}
+
+static PyMethodDef
+GuiCanvasWxBackendFast_methods[] = {
+	{"drawPatches", GuiCanvasWxBackendFast_drawPatches, METH_VARARGS, "XXX"},
+	{NULL, NULL, 0, NULL},
+};
+
+static struct PyModuleDef
+GuiCanvasWxBackendFastmodule = {
+	PyModuleDef_HEAD_INIT, "GuiCanvasWxBackendFast", NULL, -1, GuiCanvasWxBackendFast_methods,
+};
+
+PyMODINIT_FUNC
+PyInit_GuiCanvasWxBackendFast(void)
+{
+	return PyModule_Create(&GuiCanvasWxBackendFastmodule);
+}

libroar/RoarCanvasCommandsFile.py

@@ -102,10 +102,7 @@ class RoarCanvasCommandsFile():
             self.parentFrame.Bind(wx.EVT_MENU, lambda event: self.canvasOpenRecent(event, pathName), menuItemWindow)
             self.lastFiles += [{"menuItemId":menuItemId, "menuItemWindow":menuItemWindow, "pathName":pathName}]
             if serialise:
-                localConfFileName = getLocalConfPathName("Recent.lst")
-                with open(localConfFileName, "w", encoding="utf-8") as outFile:
-                    for lastFile in [l["pathName"] for l in self.lastFiles]:
-                        print(lastFile, file=outFile)
+                self._saveRecent()
 
     def _pushSnapshot(self, pathName):
         menuItemId = wx.NewId()
@@ -122,6 +119,12 @@ class RoarCanvasCommandsFile():
         if self.canvasRestore.attrDict["id"] in self.parentFrame.menuItemsById:
             self.parentFrame.menuItemsById[self.canvasRestore.attrDict["id"]].Enable(False)
 
+    def _saveRecent(self):
+        localConfFileName = getLocalConfPathName("Recent.lst")
+        with open(localConfFileName, "w", encoding="utf-8") as outFile:
+            for lastFile in [l["pathName"] for l in self.lastFiles]:
+                print(lastFile, file=outFile)
+
     def _storeLastDir(self, pathName):
         localConfFileName = getLocalConfPathName("RecentDir.txt")
         with open(localConfFileName, "w", encoding="utf-8") as outFile:
@@ -170,8 +173,13 @@ class RoarCanvasCommandsFile():
                 outPathName = dialog.GetPath(); self.lastDir = os.path.dirname(outPathName); self._storeLastDir(self.lastDir);
                 self.parentCanvas.SetCursor(wx.Cursor(wx.CURSOR_WAIT))
                 eventDc = self.parentCanvas.backend.getDeviceContext(self.parentCanvas.GetClientSize(), self.parentCanvas)
-                self.parentCanvas.backend.drawCursorMaskWithJournal(self.parentCanvas.canvas, self.parentCanvas.canvas.journal, eventDc)
+                self.parentCanvas.backend.drawCursorMaskWithJournal(self.parentCanvas.canvas, self.parentCanvas.canvas.journal, eventDc, reset=False)
                 self.parentCanvas.canvas.exportStore.exportBitmapToPngFile(self.parentCanvas.backend.canvasBitmap, outPathName, wx.BITMAP_TYPE_PNG)
+                eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
+                cursorPatches = self.parentCanvas.canvas.journal.popCursor(reset=False)
+                if len(cursorPatches) > 0:
+                    self.parentCanvas.backend.drawPatches(self.parentCanvas.canvas, eventDc, cursorPatches, isCursor=True)
+                eventDc.SetDeviceOrigin(*eventDcOrigin)
                 self.parentCanvas.SetCursor(wx.Cursor(wx.NullCursor))
                 return True
 
@@ -179,8 +187,13 @@ class RoarCanvasCommandsFile():
     def canvasExportImgur(self, event):
         self.parentCanvas.SetCursor(wx.Cursor(wx.CURSOR_WAIT))
         eventDc = self.parentCanvas.backend.getDeviceContext(self.parentCanvas.GetClientSize(), self.parentCanvas)
-        self.parentCanvas.backend.drawCursorMaskWithJournal(self.parentCanvas.canvas, self.parentCanvas.canvas.journal, eventDc)
+        self.parentCanvas.backend.drawCursorMaskWithJournal(self.parentCanvas.canvas, self.parentCanvas.canvas.journal, eventDc, reset=False)
         rc, status, result = self.parentCanvas.canvas.exportStore.exportBitmapToImgur(self.imgurApiKey, self.parentCanvas.backend.canvasBitmap, "", "", wx.BITMAP_TYPE_PNG)
+        eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
+        cursorPatches = self.parentCanvas.canvas.journal.popCursor(reset=False)
+        if len(cursorPatches) > 0:
+            self.parentCanvas.backend.drawPatches(self.parentCanvas.canvas, eventDc, cursorPatches, isCursor=True)
+        eventDc.SetDeviceOrigin(*eventDcOrigin)
         self.parentCanvas.SetCursor(wx.Cursor(wx.NullCursor))
         if rc:
             if not wx.TheClipboard.IsOpened():
@@ -272,6 +285,7 @@ class RoarCanvasCommandsFile():
             if not rc:
                 numLastFile = [i for i in range(len(self.lastFiles)) if self.lastFiles[i]["pathName"] == pathName][0]
                 self.canvasOpenRecent.attrDict["menu"].Delete(self.lastFiles[numLastFile]["menuItemId"]); del self.lastFiles[numLastFile];
+                self._saveRecent()
 
     @GuiSubMenuDecorator("Restore Snapshot", "Res&tore Snapshot", None, None, False)
     def canvasRestore(self, event, pathName=None):

libroar/RoarCanvasWindow.py

@@ -56,12 +56,28 @@ class RoarCanvasWindow(GuiWindow):
                     self.canvas.applyPatch(patch, commitUndo=True)
                 self.canvas.journal.end()
             if patchesCursor != None:
-                patchesCursorCells = self.backend.drawPatches(self.canvas, eventDc, patchesCursor, isCursor=True)
-                if len(patchesCursorCells) > 0:
-                    self.canvas.journal.pushCursor(patchesCursorCells)
+                self.backend.drawPatches(self.canvas, eventDc, patchesCursor, isCursor=True)
+                if len(patchesCursor) > 0:
+                    self.canvas.journal.pushCursor(patchesCursor)
             eventDc.SetDeviceOrigin(*eventDcOrigin)
             self.commands.update(dirty=self.dirty, cellPos=self.brushPos, undoLevel=self.canvas.journal.patchesUndoLevel)
 
+    def _eraseBackground(self, eventDc):
+        viewRect = self.GetViewStart()
+        canvasSize, panelSize = [a * b for a, b in zip(self.backend.canvasSize, self.backend.cellSize)], self.GetSize()
+        if viewRect != (0, 0):
+            viewRect = [a * b for a, b in zip(self.backend.cellSize, viewRect)]
+            canvasSize = [a - b for a, b in zip(canvasSize, viewRect)]
+        rectangles, pens, brushes = [], [], []
+        if panelSize[0] > canvasSize[0]:
+            brushes += [self.bgBrush]; pens += [self.bgPen];
+            rectangles += [[canvasSize[0], 0, panelSize[0] - canvasSize[0], panelSize[1]]]
+        if panelSize[1] > canvasSize[1]:
+            brushes += [self.bgBrush]; pens += [self.bgPen];
+            rectangles += [[0, canvasSize[1], panelSize[0], panelSize[1] - canvasSize[1]]]
+        if len(rectangles) > 0:
+            eventDc.DrawRectangleList(rectangles, pens, brushes)
+
     def _snapshotsReset(self):
         self._snapshotFiles, self._snapshotsUpdateLast = [], time.time()
         self.commands._resetSnapshots()
@@ -218,6 +234,9 @@ class RoarCanvasWindow(GuiWindow):
     def onEnterWindow(self, event):
         self.lastCellState = None
 
+    def onErase(self, event):
+        pass
+
     def onLeaveWindow(self, event):
         if False:
             eventDc = self.backend.getDeviceContext(self.GetClientSize(), self, self.GetViewStart())
@@ -245,6 +264,7 @@ class RoarCanvasWindow(GuiWindow):
         if modifiers == (wx.MOD_CONTROL | wx.MOD_ALT):
             newFontSize = self.backend.fontSize + delta
             if newFontSize > 0:
+                self.Freeze()
                 self.backend.fontSize = newFontSize
                 self.backend.resize(self.canvas.size); self.scrollStep = self.backend.cellSize;
                 super().resize([a * b for a, b in zip(self.canvas.size, self.backend.cellSize)])
@@ -256,6 +276,7 @@ class RoarCanvasWindow(GuiWindow):
                         patches += [[numCol, numRow, *self.canvas.map[numRow][numCol]]]
                 self.backend.drawPatches(self.canvas, eventDc, patches, isCursor=False)
                 eventDc.SetDeviceOrigin(*eventDcOrigin)
+                self.Thaw(); del eventDc; self._eraseBackground(wx.ClientDC(self));
         elif modifiers == (wx.MOD_CONTROL | wx.MOD_SHIFT):
             self.commands.canvasCanvasSize(self.commands.canvasCanvasSize, 2, 1 if delta > 0 else 0)(None)
         elif modifiers == wx.MOD_CONTROL:
@@ -264,51 +285,64 @@ class RoarCanvasWindow(GuiWindow):
             event.Skip()
 
     def onPaint(self, event):
+        viewRect = self.GetViewStart()
         eventDc = self.backend.getDeviceContext(self.GetClientSize(), self)
-        self.backend.onPaint(self.GetClientSize(), self, self.GetViewStart())
+        self.backend.onPaint(self.GetClientSize(), self, viewRect)
+        del eventDc; self._eraseBackground(wx.PaintDC(self));
 
-    def resize(self, newSize, commitUndo=True, dirty=True):
+    def resize(self, newSize, commitUndo=True, dirty=True, freeze=True):
+        if freeze:
+            self.Freeze()
         viewRect = self.GetViewStart()
         oldSize = [0, 0] if self.canvas.map == None else self.canvas.size
         deltaSize = [b - a for a, b in zip(oldSize, newSize)]
         if self.canvas.resize(newSize, commitUndo):
             self.backend.resize(newSize); self.scrollStep = self.backend.cellSize;
             super().resize([a * b for a, b in zip(newSize, self.backend.cellSize)])
-            eventDc = self.backend.getDeviceContext(self.GetClientSize(), self)
-            eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
-            patches = []
-            if deltaSize[0] > 0:
-                for numRow in range(oldSize[1]):
-                    for numNewCol in range(oldSize[0], newSize[0]):
-                        patches += [[numNewCol, numRow, 1, 1, 0, " "]]
-            if deltaSize[1] > 1:
-                for numNewRow in range(oldSize[1], newSize[1]):
-                    for numNewCol in range(newSize[0]):
-                        patches += [[numNewCol, numNewRow, 1, 1, 0, " "]]
-            self.backend.drawPatches(self.canvas, eventDc, patches, isCursor=False)
-            eventDc.SetDeviceOrigin(*eventDcOrigin)
             self.Scroll(*viewRect); self.dirty = dirty;
             self.commands.update(dirty=self.dirty, size=newSize, undoLevel=self.canvas.journal.patchesUndoLevel)
             if commitUndo:
                 self._snapshotsUpdate()
+        if freeze:
+            eventDc = self.backend.getDeviceContext(self.GetClientSize(), self)
+            eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
+            cursorPatches = self.canvas.journal.popCursor(reset=False)
+            if len(cursorPatches) > 0:
+                self.backend.drawPatches(self.canvas, eventDc, cursorPatches, isCursor=True)
+            eventDc.SetDeviceOrigin(*eventDcOrigin)
+            del eventDc; self.Thaw(); self._eraseBackground(wx.ClientDC(self));
 
     def undo(self, redo=False):
+        freezeFlag = False 
         deltaPatches = self.canvas.journal.popUndo() if not redo else self.canvas.journal.popRedo()
         eventDc = self.backend.getDeviceContext(self.GetClientSize(), self)
         eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
-        self.backend.drawCursorMaskWithJournal(self.canvas, self.canvas.journal, eventDc)
+        patchesCursor = self.backend.drawCursorMaskWithJournal(self.canvas, self.canvas.journal, eventDc, reset=False)
         patches = []
         for patch in deltaPatches:
             if patch == None:
                 continue
             elif patch[0] == "resize":
-                del eventDc; self.resize(patch[1:], False);
-                eventDc = self.backend.getDeviceContext(self.GetClientSize(), self)
-                eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
+                if not freezeFlag:
+                    self.Freeze(); freezeFlag = True;
+                eventDc = None; self.resize(patch[1:], False, freeze=False);
             else:
                self.canvas._commitPatch(patch); patches += [patch];
+        if eventDc == None:
+            eventDc = self.backend.getDeviceContext(self.GetClientSize(), self)
+            eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
         self.backend.drawPatches(self.canvas, eventDc, patches, isCursor=False)
+        if len(patchesCursor):
+            self.backend.drawPatches(self.canvas, eventDc, patchesCursor, isCursor=True)
         eventDc.SetDeviceOrigin(*eventDcOrigin)
+        if freezeFlag:
+            eventDc = self.backend.getDeviceContext(self.GetClientSize(), self)
+            eventDcOrigin = eventDc.GetDeviceOrigin(); eventDc.SetDeviceOrigin(0, 0);
+            cursorPatches = self.canvas.journal.popCursor(reset=False)
+            if len(cursorPatches) > 0:
+                self.backend.drawPatches(self.canvas, eventDc, cursorPatches, isCursor=True)
+            eventDc.SetDeviceOrigin(*eventDcOrigin)
+            del eventDc; self.Thaw(); self._eraseBackground(wx.ClientDC(self));
 
     def update(self, newSize, commitUndo=True, newCanvas=None, dirty=True):
         self.resize(newSize, commitUndo, dirty)
@@ -329,6 +363,8 @@ class RoarCanvasWindow(GuiWindow):
         self.popupEventDc = None
         self.dropTarget = RoarCanvasWindowDropTarget(self)
         self.SetDropTarget(self.dropTarget)
+        self.bgBrush, self.bgPen = wx.Brush(self.GetBackgroundColour(), wx.BRUSHSTYLE_SOLID), wx.Pen(self.GetBackgroundColour(), 1)
+        self.Bind(wx.EVT_ERASE_BACKGROUND, self.onErase)
         self.Bind(wx.EVT_MOUSEWHEEL, self.onMouseWheel)
         self._snapshotsReset()
 

librtl/Rtl.py

@@ -5,9 +5,7 @@
 # This project is licensed under the terms of the MIT licence.
 #
 
-import re, statistics, time
-
-timeState = [None, None, 0, []]
+import re
 
 def flatten(l):
     return [li for l_ in l for li in l_]
@@ -17,19 +15,4 @@ def natural_sort(l):
     alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', key)] 
     return sorted(l, key=alphanum_key)
 
-def timePrint(pfx):
-    timeState[0] = time.time() if timeState[0] == None else timeState[0]
-    t1 = time.time(); td = t1 - timeState[0]
-    if td > 0:
-        timeState[1] = td if timeState[1] == None else min(td, timeState[1])
-        timeState[2] = max(td, timeState[2])
-        timeState[3] += [td]
-        print("{} took {:.4f} ms (min: {:.4f} max: {:.4f} avg: {:.4f})".format(pfx, td * 1000, timeState[1] * 1000, timeState[2] * 1000, statistics.mean(timeState[3]) * 1000))
-
-def timeReset():
-    timeState = [None, None, 0, []]
-
-def timeStart():
-    timeState[0] = time.time()
-
 # vim:expandtab foldmethod=marker sw=4 ts=4 tw=120

libtools/ToolCircle.py

@@ -24,8 +24,7 @@ class ToolCircle(Tool):
         for numRow in range(len(cells)):
             for numCol in range(len(cells[numRow])):
                 point = cells[numRow][numCol]
-                if  ((point[0] >= 0) and (point[1] >= 0))                                           \
-                and (point[0] < canvas.size[0]) and (point[1] < canvas.size[1]):
+                if (point[0] >= 0) and (point[1] >= 0):
                     if ((numRow == 0) or (numRow == (len(cells) - 1)))                              \
                     or ((numCol == 0) or (numCol == (len(cells[numRow]) - 1))):
                         patch = [*cells[numRow][numCol], brushColours[0], brushColours[0], 0, " "]