Details
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Bug
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Resolution: Fixed
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P1: Critical
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Qt for MCUs 2.0.1
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None
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RH850 D1M
Description
Tested on RH850.
See Reproduction for a snippet that can can reproduce the freeze every time.
The summary is that when you make an "invisible" object by reducing height or width to 0, the object still grabs a DrawBuffer, but never sets gpuActive, so the program gets stuck in a loop. Note, this requires that only the invisible object gets updated--some other object being drawn at the same time may cause a proper draw.
Details
platform_rh850.cpp
unsigned char *getNextDrawBuffer() const { unsigned char *bits = NULL; do { //Infinite loop bits = (unsigned char *) R_WM_WindowNewDrawBufGet(WM_UNIT, &wmWindow); } while (!bits); return bits; }
platform_rh850.cpp
void blendRect(DrawingDevice *drawingDevice, const Rect &rect, Rgba32 color, BlendMode blendMode)
{
// gpu not active, but zero pixels. We enter the fallback engine (32bpp in our case), which does NOT set gpuactive.
if (!gpuActive && rect.width() * rect.height() < GPU_PIXEL_THRESHOLD) {
drawingDevice->fallbackDrawingEngine()->blendRect(drawingDevice, rect, color, blendMode);
return;
}
const r_drw2d_BlendMode_t drw2dBlendMode = blendMode == DrawingEngine::BlendMode_Source || color.alpha() == 255
? R_DRW2D_BLENDMODE_SRC
: R_DRW2D_BLENDMODE_SRC_OVER;
rh850_blendRect_impl(drawingDevice, rect, color, drw2dBlendMode);
}
Reproduction
Summary: Drop the width of a rect to zero, move it along the Y axis, then restore the width (with pauses in between).
SequentialAnimation {
loops: 1
running: true
PauseAnimation {duration: 10000}
ScriptAction {script: ani.running = true}
}
property real controlVal: 100
SequentialAnimation {
id: ani
loops: -1
running: false
ScriptAction {
script: root.controlVal= 0
}
PauseAnimation { duration: 100 }
PropertyAnimation {
target: vis
property: "y"
from: root.height / 2
to: root.height / 2 + 40
duration: 200
}
PropertyAnimation {
target: vis
property: "y"
to: root.height / 2
duration: 200
}
PauseAnimation { duration: 1 }
ScriptAction {
script: root.controlVal= 100
}
PauseAnimation { duration: 300 }
}
Rectangle {
id: vis
height: 50
width: controlVal
color: "red"
x: parent.width/2 - width
y: parent.height / 2
}
Fixes
(Rewritten from memory, please double check)
unsigned char *getNextDrawBuffer() const { unsigned char *bits = NULL; do { bits = (unsigned char *) R_WM_WindowNewDrawBufGet(WM_UNIT, &wmWindow); if (!bits){ R_WM_FrameWait(WM_UNIT, 0); } } while (!bits); return bits; }
Not Fixes
//This doesn't work:
QML:
visible: width > 0 //Width gets turned into an int CPP side, so the object will still be "visible" at width=0.99 but width is zero. A problem for animations