https://bugs.kde.org/show_bug.cgi?id=408289
Bug ID: 408289
Summary: Desktop shines trough alpha
Product: krita
Version: 4.2.0
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: OpenGL Canvas
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 120562
--> https://bugs.kde.org/attachment.cgi?id=120562&action=edit
Example for alpha issue
SUMMARY
When I copen a new Canvas filled with only alpha my desktop and other
applications behind Krita shine though the canvas when drawing very lightly.
When creating a new layer below the issue is resolved. How ever when hiding the
new layer the issue persist.
STEPS TO REPRODUCE
1. Create new empty (aka filled with alpha) canvas
2. draw lightly with a brush on a the canvas
OBSERVED RESULT
Desktop background appears in drawing
EXPECTED RESULT
Checkerboard pattern is persistent behind alpha surfaces
SOFTWARE/OS VERSIONS
OpenGL Info
Vendor: "NVIDIA Corporation"
Renderer: "GeForce GTX 1060 6GB/PCIe/SSE2"
Version: "4.6.0 NVIDIA 418.56"
Shading language: "4.60 NVIDIA"
Requested format: QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior
QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval 0, profile
QSurfaceFormat::OpenGLContextProfile(CompatibilityProfile))
Current format: QSurfaceFormat(version 4.6, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior
QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval 0, profile
QSurfaceFormat::OpenGLContextProfile(CompatibilityProfile))
Version: 4.6
Supports deprecated functions true
is OpenGL ES: false
QPA OpenGL Detection Info
supportsDesktopGL: true
supportsOpenGLES: true
isQtPreferOpenGLES: false
== log ==
Supported renderers: QFlags(0x2|0x4)
Surface format preference list:
* QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior
QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval 0, profile
QSurfaceFormat::OpenGLContextProfile(CompatibilityProfile))
QSurfaceFormat::RenderableType(OpenGL)
* QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior
QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval 0, profile
QSurfaceFormat::OpenGLContextProfile(CompatibilityProfile))
QSurfaceFormat::RenderableType(OpenGLES)
Probing format... QSurfaceFormat::RenderableType(OpenGL)
Found format: QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior
QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval 0, profile
QSurfaceFormat::OpenGLContextProfile(CompatibilityProfile))
QSurfaceFormat::RenderableType(OpenGL)
Krita
Version: 4.2.0
Languages: de
Hidpi: false
Qt
Version (compiled): 5.9.5
Version (loaded): 5.9.5
OS Information
Build ABI: x86_64-little_endian-lp64
Build CPU: x86_64
CPU: x86_64
Kernel Type: linux
Kernel Version: 4.15.0-47-generic
Pretty Productname: Ubuntu 18.04.2 LTS
Product Type: ubuntu
Product Version: 18.04
Hardware Information
GPU Acceleration: auto
Memory: 15997 Mb
Number of Cores: 4
Swap Location: /tmp
ADDITIONAL INFORMATION
See attached images
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