https://bugs.kde.org/show_bug.cgi?id=479462
Bug ID: 479462
Summary: Default pressure curve gives uneven on left part of
tablet - S-pen
Classification: Applications
Product: krita
Version: 5.2.2
Platform: Android
OS: Android 13.x
Status: REPORTED
Severity: normal
Priority: NOR
Component: Brush Engine/Shape
Assignee: krita-bugs-n...@kde.org
Reporter: zayastarcal...@gmail.com
Target Milestone: ---
Created attachment 164704
--> https://bugs.kde.org/attachment.cgi?id=164704&action=edit
images containing the issue.
SUMMARY
When using the my tablet (samsung galaxy tab s8 ultra) to draw, on the left
side of the screen there seems to be a bug where on certain spots it gives
uneven pressure, I have tested on two different tablets, S8 ultra, and S9
ultra, both exhibit the same issue with the default pressure curve of the tools
that have anything else than a linear curve, see attached photos.
Troubleshooting includes:
1. tested different tablet with same version of krita, -> same issue
2. tested with a different S-pen on both of those tablets -> same issue
3. uninstalled krita, removing all data associated with it, and reinstalled it
-> same issue
4. tested different brushes and tools in krita, brushes with non-linear curves
exhibits the problems.
5. made brushes have a linear curve from 0 - 100, with just 2 points -> issue
resolved as a bypass
STEPS TO REPRODUCE
1. Have a tablet with wacom support on android 13.x (I believe any android
tablet with wacom style pens work)
2. set brush pixel size to be 50 or more so problem can be visible
3. use any pen that has a different curve for their size than linear, for
example the fountain pen.
4. draw lines going down from the top, with an even pressure and observe the
pressure changing by itself.
OBSERVED RESULT
see images attached
EXPECTED RESULT
expected result is to have the pen pressure in that region not change as you
move over a specific part with even pressure, see images for explanation.
SOFTWARE/OS VERSIONS
Android 13
Qt Version: 5.15.7
ADDITIONAL INFORMATION
Krita
Version: 5.2.2
Hidpi: true
Qt
Version (compiled): 5.15.7
Version (loaded): 5.15.7
OS Information
Build ABI: arm64-little_endian-lp64
Build CPU: arm64
CPU: arm64
Kernel Type: linux
Kernel Version: 5.10.136-android12-9-27102101-abX906BXXS5BWI1
Pretty Productname: Android (13.0)
Product Type: android
Product Version: 13.0
Product Model: Samsung SM-X906B
Locale
Languages: en_GB, en_Latn_GB
C locale: C.UTF-8
QLocale current: en
QLocale system: en
QTextCodec for locale: UTF-8
OpenGL Info
Vendor: "Qualcomm"
Renderer: "Adreno (TM) 730"
Driver version: "OpenGL ES 3.2 V@0615.0 (GIT@5a00bbd4b7, I0f5aa60515,
1673930385) (Date:01/16/23)"
Shading language: "OpenGL ES GLSL ES 3.20"
Requested format: QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile
QSurfaceFormat::NoProfile)
Current format: QSurfaceFormat(version 3.2, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile
QSurfaceFormat::NoProfile)
GL version: 3.2
Supports deprecated functions false
Is OpenGL ES: true
supportsBufferMapping: true
supportsBufferInvalidation: false
forceDisableTextureBuffers: false
Extensions:
GL_EXT_clip_control
GL_KHR_texture_compression_astc_hdr
GL_OES_texture_compression_astc
GL_EXT_primitive_bounding_box
GL_EXT_protected_textures
GL_EXT_texture_sRGB_decode
GL_OES_shader_multisample_interpolation
GL_KHR_robust_buffer_access_behavior
GL_QCOM_validate_shader_binary
GL_OES_framebuffer_object
GL_EXT_color_buffer_float
GL_OES_depth24
GL_EXT_discard_framebuffer
GL_QCOM_texture_foveated2
GL_EXT_draw_buffers_indexed
GL_OES_texture_float
GL_ARM_shader_framebuffer_fetch_depth_stencil
GL_OES_texture_npot
GL_EXT_read_format_bgra
GL_OES_texture_half_float_linear
GL_QCOM_tiled_rendering
GL_EXT_memory_object_fd
GL_OES_sample_shading
GL_OES_EGL_image
GL_EXT_texture_buffer
GL_EXT_fragment_invocation_density
GL_EXT_external_buffer
GL_EXT_texture_type_2_10_10_10_REV
GL_OES_vertex_array_object
GL_ANDROID_extension_pack_es31a
GL_EXT_sRGB
GL_EXT_texture_cube_map_array
GL_KHR_texture_compression_astc_ldr
GL_EXT_debug_label
GL_OES_texture_3D
GL_OES_standard_derivatives
GL_OES_rgb8_rgba8
GL_EXT_disjoint_timer_query
GL_OES_texture_half_float
GL_EXT_blit_framebuffer_params
GL_EXT_EGL_image_storage
GL_EXT_gpu_shader5
GL_EXT_buffer_storage
GL_QCOM_shader_framebuffer_fetch_noncoherent
GL_OES_vertex_half_float
GL_EXT_shader_non_constant_global_initializers
GL_OES_shader_image_atomic
GL_EXT_shader_io_blocks
GL_OES_EGL_image_external_essl3
GL_QCOM_shader_framebuffer_fetch_rate
GL_QCOM_render_shared_exponent
GL_QCOM_texture_foveated
GL_OES_EGL_image_external
GL_AMD_compressed_ATC_texture
GL_OES_texture_storage_multisample_2d_array
GL_EXT_sRGB_write_control
GL_QCOM_shading_rate
GL_EXT_EGL_image_array
GL_EXT_copy_image
GL_KHR_blend_equation_advanced_coherent
GL_OES_texture_float_linear
GL_OES_depth_texture_cube_map
GL_QCOM_motion_estimation
GL_QCOM_YUV_texture_gather
GL_EXT_tessellation_shader
GL_KHR_blend_equation_advanced
GL_EXT_texture_sRGB_R8
GL_EXT_texture_format_sRGB_override
GL_EXT_EGL_image_external_wrap_modes
GL_EXT_clip_cull_distance
GL_EXT_texture_format_BGRA8888
GL_EXT_texture_norm16
GL_OES_surfaceless_context
GL_OES_element_index_uint
GL_QCOM_frame_extrapolation
GL_KHR_debug
GL_OES_EGL_sync
GL_OES_compressed_ETC1_RGB8_texture
GL_OES_texture_view
GL_OES_texture_stencil8
GL_EXT_memory_object
GL_EXT_robustness
GL_OVR_multiview2
GL_OVR_multiview_multisampled_render_to_texture
GL_EXT_shader_framebuffer_fetch
GL_EXT_blend_func_extended
GL_EXT_texture_filter_anisotropic
GL_OES_packed_depth_stencil
GL_OES_get_program_binary
GL_EXT_YUV_target
GL_IMG_texture_filter_cubic
GL_OES_sample_variables
GL_EXT_multisampled_render_to_texture2
GL_EXT_texture_border_clamp
GL_NV_shader_noperspective_interpolation
GL_KHR_no_error
GL_QCOM_alpha_test
GL_EXT_geometry_shader
GL_EXT_multisampled_render_to_texture
GL_EXT_debug_marker
GL_EXT_color_buffer_half_float
GL_OES_depth_texture
GL_OVR_multiview
GL_QCOM_texture_foveated_subsampled_layout
QPA OpenGL Detection Info
supportsDesktopGL: false
supportsOpenGLES: true
isQtPreferOpenGLES: true
Detected renderers:
(Supported) Adreno (TM) 730 (OpenGL ES 3.2 V@0615.0 (GIT@5a00bbd4b7,
I0f5aa60515, 1673930385) (Date:01/16/23))
useBufferInvalidation (config option): false
Hardware Information
GPU Acceleration: auto
Memory: 7300 Mb
Number of Cores: 8
Swap Location: /data/data/org.krita/cache
Built for: arm64+neon
Base instruction set: arm64+neon
Supported instruction sets: arm64+neon arm32+neon avx512bw avx512dq avx512cd
avx512f fma3+avx2 avx2 fma3+avx avx fma4 fma3+sse4.2 sse4.2 sse4.1 ssse3 sse3
sse2
Current Settings
Current Swap Location: /data/data/org.krita/cache
Current Swap Location writable: true
Undo Enabled: true
Undo Stack Limit: 200
Use OpenGL: true
Use OpenGL Texture Buffer: true
Disable Vector Optimizations: false
Disable AVX Optimizations: false
Canvas State: OPENGL_NOT_TRIED
Autosave Interval: 420
Use Backup Files: true
Number of Backups Kept: 1
Backup File Suffix: ~
Backup Location: Same Folder as the File
Backup Location writable: false
Resource Location:
Use Win8 Pointer Input: false
Use RightMiddleTabletButton Workaround: false
Levels of Detail Enabled: false
Use Zip64: false
Display Information
Number of screens: 1
Screen: 0
Name:
Depth: 32
Scale: 2
Physical DPI120.01
Logical DPI72
Physical Size: 314, 182
Position: 0, 0
Resolution in pixels: 1480x862
Manufacturer:
Model:
Refresh Rate: 60
Serial Number:
Current Settings
Current Swap Location: /data/data/org.krita/cache
Current Swap Location writable: true
Undo Enabled: true
Undo Stack Limit: 200
Use OpenGL: true
Use OpenGL Texture Buffer: true
Disable Vector Optimizations: false
Disable AVX Optimizations: false
Canvas State: TRY_OPENGL
Autosave Interval: 420
Use Backup Files: true
Number of Backups Kept: 1
Backup File Suffix: ~
Backup Location: Same Folder as the File
Backup Location writable: false
Resource Location: /storage/emulated/0/Android/data/org.krita/files
Use Win8 Pointer Input: false
Use RightMiddleTabletButton Workaround: false
Levels of Detail Enabled: false
Use Zip64: false
---------------------
================================================================================
SESSION: 06 Jan 2024 12:05:30 +0100. Executing
/data/app/~~jWEmgSF6Nf7iAVWLDgwRIQ==/org.krita-zvB7PZ1VIDojuZ829RZzQA==/lib/arm64/libkrita_arm64-v8a.so
Krita Version: 5.2.2, Qt version compiled: 5.15.7, loaded: 5.15.7. Process ID:
8957
-- -- -- -- -- -- -- --
06 Jan 2024 12:05:30 +0100: Style: fusion. Available styles: android, Windows,
Fusion
06 Jan 2024 12:05:31 +0100: Creating database from scratch (database didn't
exist, new schema version: 0.0.17).
06 Jan 2024 12:05:44 +0100: Created image "Unnamed", 2480 * 3508 pixels, 300
dpi. Color model: 8-bit integer/channel RGB/Alpha (sRGB-elle-V2-srgbtrc.icc).
Layers: 2
06 Jan 2024 12:07:56 +0100: Converting from application/x-krita to
application/x-krita. Location:
/storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.krita-8957-document_0-autosave.kra.
Real location:
/storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.krita-8957-document_0-autosave.kra.
Batchmode: 0. Configuration: none
06 Jan 2024 12:12:35 +0100: Removing autosave file:
/storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.krita-8957-document_0-autosave.kra
06 Jan 2024 12:13:11 +0100: Created image "Unnamed", 2480 * 3508 pixels, 300
dpi. Color model: 8-bit integer/channel RGB/Alpha (sRGB-elle-V2-srgbtrc.icc).
Layers: 2
---------------------
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