[Lazarus] Qt4 crash in CudaText

[zeljko]

On 09/27/2019 06:57 PM, AlexeyT via lazarus wrote:
> Stack trace.
> 
> #0 QTransform::type() const at :0
> 
> #1 ?? at :0
> #2 QPainter::drawImage(QRectF const&, QImage const&, QRectF const&, 
> QFlags<Qt::ImageConversionFlag>) at :0

This is crash in Qt library.

> #3 QPainter_drawImage2 at :0
> #4 DRAWIMAGE(0x7fffdd6aad80, 0x7fffffffb2e4, 0x18bd8a0, 0x7fffffffb2f4, 
> 0x0, 0x7fffffffb2d4, 0) at qt/qtobjects.pas:3568

At line 3568 we are trying to draw image which is converted from 
QImageFormat_RGB32 format to QImageFormat_ARGB32.
That conversion is needed to fix few issues we had in past with various 
qt versions on linux and windows. See issues #11713 and #25590 for 
details. Quick check if that works is to change line (above line 3568 in 
qtobjects.pas)

     if (not EqualRect(LocalRect, sourceRect^) or (Mask = nil)) and
       (QImage_format(Image) = QImageFormat_RGB32) then
      ...
     to
     if (not EqualRect(LocalRect, sourceRect^) then
      ....

and give feedback. As I can see from stack trace your LocalRect and 
SourceRect are equal , so it will not convert your image to 
QImageFormat_ARGB32 , but it will directly draw it in line 3611 
(qtobjects.pas).

Just change that, rebuild your project and test.


zeljko





> #5 STRETCHMASKBLT(0x7fffef808d30, 140736908144000, 0, 0, 438, 256, 
> 140736908144384, 0, 0, 438, 256, 0, 0, 0, 13369376) at qt/qtwinapi.inc:6990
> #6 STRETCHBLT(0x7fffef808d30, 140736908144000, 0, 0, 438, 256, 
> 140736908144384, 0, 0, 438, 256, 13369376) at qt/qtwinapi.inc:6787
> #7 STRETCHBLT(140736908144000, 0, 0, 438, 256, 140736908144384, 0, 0, 
> 438, 256, 13369376) at include/winapi.inc:1025
> #8 COPYRECT(0x7fffd6997ae0, {LEFT = 0, TOP = 0, RIGHT = 438, BOTTOM = 
> 256, TOPLEFT = {X = 0, Y = 0}, BOTTOMRIGHT = {X = 438, Y = 256}, VECTOR 
> = {0, 0, 438, 256}}, 0x7fffd6997f00, {LEFT = 0, TOP = 0, RIGHT = 438, 
> BOTTOM = 256, TOPLEFT = {X = 0, Y = 0}, BOTTOMRIGHT = {X = 438, Y = 
> 256}, VECTOR = {0, 0, 438, 256}}) at include/canvas.inc:122
> #9 PAINT(0x7fffd6eae8f0) at atlistbox.pas:541
> #10 PAINTWINDOW(0x7fffd6eae8f0, 140736908144000) at 
> include/customcontrol.inc:118
> #11 PAINTHANDLER(0x7fffd6eae8f0, {MSG = 15, UNUSEDMSG = 0, DC = 
> 140736908144000, PAINTSTRUCT = 0x7fffd6cf69c0, RESULT = 0}) at 
> include/wincontrol.inc:4856
> #12 WMPAINT(0x7fffd6eae8f0, {MSG = 15, UNUSEDMSG = 0, DC = 
> 140736908144000, PAINTSTRUCT = 0x7fffd6cf69c0, RESULT = 0}) at 
> include/wincontrol.inc:6828
> #13 WMPAINT(0x7fffd6eae8f0, {MSG = 15, UNUSEDMSG = 0, DC = 
> 140736908144000, PAINTSTRUCT = 0x7fffd6cf69c0, RESULT = 0}) at 
> include/customcontrol.inc:98
> #14 SYSTEM$_$TOBJECT_$__$$_DISPATCH$formal at :0
> #15 ?? at :0
> #16 ?? at :0
> #17 ?? at :0
> #18 ?? at :0
> #19 .Ld255 at :0
> #20 ?? at :0
> #21 ?? at :0
> #22 ?? at :0
> #23 ?? at :0
> #24 ?? at :0
> 
> 
> Alex
>