Bug 515446

Summary: Brush stroke glitches when drawing
Product: [Applications] krita Reporter: KST <kstgear>
Component: Brush enginesAssignee: Krita Bugs <krita-bugs-null>
Status: REPORTED ---    
Severity: normal    
Priority: NOR    
Version First Reported In: 5.2.15   
Target Milestone: ---   
Platform: Other   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Observed Result

Description KST 2026-02-03 08:35:22 UTC 
Created attachment 189178 [details]
Observed Result

SUMMARY
Brush stroke glitches when drawing

STEPS TO REPRODUCE
1.  Draw a line

OBSERVED RESULT
Line has tiny blocky glitches during drawing (Video below)
https://drive.google.com/file/d/13t4mbKCjzMB720pTqDsSOCHjX5YLxM9N/view

EXPECTED RESULT
Line should be rendered smoothly



Krita

 Version: 5.2.15 (git 89dea6d)
 Installation type: installer / portable package
 Hidpi: true

Qt

  Version (compiled): 5.15.7
  Version (loaded): 5.15.7

OS Information

  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.26200
  Pretty Productname: Windows 10 Version 2009
  Product Type: windows
  Product Version: 10

Locale

  Languages: en_US, en, en_Latn_US
  C locale: C
  QLocale current: en-001
  QLocale system: en-001
  QTextCodec for locale: UTF-8
  Process ACP: 65001 (UTF-8)
  System locale default ACP: 1252  (ANSI - Latin I)

OpenGL Info
 
  Vendor:  "Intel" 
  Renderer:  "Intel(R) UHD Graphics" 
  Driver version:  "3.3.0 - Build 32.0.101.6790" 
  Shading language:  "3.30 - Build 32.0.101.6790" 
  Requested format:  QSurfaceFormat(version 3.3, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::CompatibilityProfile) 
  Current format:  QSurfaceFormat(version 3.3, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples 0, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 1, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::CompatibilityProfile) 
  GL version: 3.3 
  Supports deprecated functions true 
  Is OpenGL ES: false 
  supportsBufferMapping: true 
  supportsBufferInvalidation: true 
  forceDisableTextureBuffers: false 
  Extensions: 
     GL_ARB_timer_query 
     GL_EXT_shadow_funcs 
     GL_EXT_texture_sRGB 
     GL_EXT_framebuffer_multisample 
     GL_ARB_sync 
     GL_ARB_texture_gather 
     GL_ARB_texture_cube_map 
     GL_ARB_texture_non_power_of_two 
     GL_ARB_multitexture 
     GL_EXT_fog_coord 
     GL_ARB_half_float_pixel 
     GL_EXT_texture_array 
     GL_ARB_point_parameters 
     GL_ARB_fragment_program_shadow 
     GL_EXT_shader_integer_mix 
     GL_ARB_vertex_array_bgra 
     GL_EXT_compiled_vertex_array 
     GL_ARB_base_instance 
     GL_ARB_framebuffer_object 
     GL_ARB_robust_buffer_access_behavior 
     GL_EXT_timer_query 
     GL_ARB_fragment_shader 
     GL_ARB_texture_storage_multisample 
     GL_KHR_context_flush_control 
     GL_ARB_texture_swizzle 
     GL_EXT_memory_object 
     GL_ARB_depth_buffer_float 
     GL_ARB_gpu_shader5 
     GL_ARB_bindless_texture 
     GL_ARB_shader_atomic_counters 
     GL_ARB_texture_stencil8 
     GL_ARB_sample_shading 
     GL_EXT_geometry_shader4 
     GL_EXT_packed_depth_stencil 
     GL_ARB_draw_elements_base_vertex 
     GL_ARB_texture_env_crossbar 
     GL_KHR_shader_subgroup_arithmetic 
     GL_ARB_texture_env_dot3 
     GL_ARB_transform_feedback3 
     GL_ARB_shading_language_420pack 
     GL_ARB_seamless_cube_map 
     GL_ARB_depth_clamp 
     GL_ARB_texture_buffer_object_rgb32 
     GL_ARB_texture_multisample 
     GL_ARB_draw_indirect 
     GL_EXT_blend_func_separate 
     GL_ARB_clear_buffer_object 
     GL_ARB_shader_precision 
     GL_ARB_clear_texture 
     GL_EXT_draw_buffers2 
     GL_NV_timeline_semaphore 
     GL_INTEL_map_texture 
     GL_KHR_debug 
     GL_ARB_enhanced_layouts 
     GL_ARB_texture_buffer_range 
     GL_ARB_texture_compression_bptc 
     GL_ARB_vertex_program 
     GL_ARB_derivative_control 
     GL_ARB_ES3_1_compatibility 
     GL_EXT_blend_color 
     GL_NV_texgen_reflection 
     GL_ARB_depth_texture 
     GL_ARB_texture_mirror_clamp_to_edge 
     GL_ARB_stencil_texturing 
     GL_EXT_gpu_program_parameters 
     GL_EXT_blend_equation_separate 
     GL_EXT_multi_draw_arrays 
     GL_EXT_bgra 
     GL_ARB_shader_texture_image_samples 
     GL_EXT_blend_subtract 
     GL_ARB_conservative_depth 
     GL_WIN_swap_hint 
     GL_ARB_texture_env_combine 
     GL_KHR_no_error 
     GL_ARB_shader_bit_encoding 
     GL_ARB_instanced_arrays 
     GL_ARB_texture_barrier 
     GL_ARB_vertex_shader 
     GL_ARB_window_pos 
     GL_EXT_direct_state_access 
     GL_EXT_texture_swizzle 
     GL_KHR_texture_compression_astc_ldr 
     GL_EXT_texture3D 
     GL_EXT_texture_rectangle 
     GL_KHR_shader_subgroup_basic 
     GL_ARB_provoking_vertex 
     GL_ARB_framebuffer_no_attachments 
     GL_ARB_query_buffer_object 
     GL_ARB_occlusion_query 
     GL_SUN_multi_draw_arrays 
     GL_ARB_conditional_render_inverted 
     GL_ATI_meminfo 
     GL_KHR_shader_subgroup_vote 
     GL_EXT_texture_edge_clamp 
     GL_OVR_multiview 
     GL_ARB_ES3_compatibility 
     GL_ARB_shader_subroutine 
     GL_ARB_texture_cube_map_array 
     GL_EXT_secondary_color 
     GL_ARB_occlusion_query2 
     GL_EXT_framebuffer_blit 
     GL_ARB_debug_output 
     GL_EXT_blend_minmax 
     GL_SGIS_texture_lod 
     GL_ARB_blend_func_extended 
     GL_ARB_buffer_storage 
     GL_INTEL_framebuffer_CMAA 
     GL_ARB_post_depth_coverage 
     GL_ARB_seamless_cubemap_per_texture 
     GL_ARB_vertex_buffer_object 
     GL_EXT_shader_framebuffer_fetch 
     GL_ARB_texture_compression 
     GL_INTEL_performance_query 
     GL_KHR_blend_equation_advanced_coherent 
     GL_EXT_transform_feedback 
     GL_KHR_shader_subgroup_quad 
     GL_ARB_transform_feedback2 
     GL_ARB_fragment_program 
     GL_EXT_memory_object_win32 
     GL_EXT_separate_specular_color 
     GL_EXT_texture_compression_s3tc 
     GL_EXT_stencil_wrap 
     GL_3DFX_texture_compression_FXT1 
     GL_KHR_shader_subgroup_ballot 
     GL_EXT_semaphore_win32 
     GL_ARB_clip_control 
     GL_ARB_cull_distance 
     GL_ARB_shader_objects 
     GL_ARB_texture_storage 
     GL_EXT_texture_env_add 
     GL_ARB_pixel_buffer_object 
     GL_ARB_map_buffer_alignment 
     GL_ARB_get_program_binary 
     GL_EXT_texture_lod_bias 
     GL_ARB_texture_view 
     GL_ARB_direct_state_access 
     GL_KHR_shader_subgroup_clustered 
     GL_SGIS_generate_mipmap 
     GL_IBM_texture_mirrored_repeat 
     GL_ARB_vertex_array_object 
     GL_ARB_draw_instanced 
     GL_AMD_vertex_shader_layer 
     GL_EXT_rescale_normal 
     GL_ARB_multi_draw_indirect 
     GL_AMD_vertex_shader_viewport_index 
     GL_ARB_fragment_shader_interlock 
     GL_ARB_tessellation_shader 
     GL_ARB_half_float_vertex 
     GL_ARB_texture_env_add 
     GL_INTEL_fragment_shader_ordering 
     GL_ARB_framebuffer_sRGB 
     GL_ARB_shader_stencil_export 
     GL_ARB_get_texture_sub_image 
     GL_ARB_texture_buffer_object 
     GL_ARB_internalformat_query2 
     GL_EXT_semaphore 
     GL_ARB_gpu_shader_fp64 
     GL_ARB_shader_image_size 
     GL_ARB_arrays_of_arrays 
     GL_ARB_transform_feedback_instanced 
     GL_EXT_texture_shared_exponent 
     GL_ARB_shader_draw_parameters 
     GL_INTEL_conservative_rasterization 
     GL_ARB_draw_buffers 
     GL_ARB_multisample 
     GL_ATI_separate_stencil 
     GL_EXT_texture_snorm 
     WGL_EXT_swap_control 
     GL_ARB_shading_language_100 
     GL_ARB_shader_atomic_counter_ops 
     GL_ARB_invalidate_subdata 
     GL_ARB_color_buffer_float 
     GL_ARB_program_interface_query 
     GL_ARB_texture_filter_anisotropic 
     GL_NV_blend_square 
     GL_ARB_shading_language_packing 
     GL_ARB_shader_storage_buffer_object 
     GL_NV_primitive_restart 
     GL_ARB_draw_buffers_blend 
     GL_KHR_shader_subgroup 
     GL_AMD_depth_clamp_separate 
     GL_ARB_copy_image 
     GL_SGIS_texture_edge_clamp 
     GL_ARB_vertex_type_2_10_10_10_rev 
     GL_EXT_gpu_shader4 
     GL_EXT_texture_filter_anisotropic 
     GL_ARB_explicit_attrib_location 
     GL_ARB_compute_shader 
     GL_ARB_gl_spirv 
     GL_ARB_robustness_isolation 
     GL_ARB_texture_compression_rgtc 
     GL_ARB_viewport_array 
     GL_ARB_texture_query_lod 
     GL_EXT_draw_range_elements 
     GL_ARB_separate_shader_objects 
     GL_ARB_vertex_attrib_binding 
     GL_EXT_texture_storage 
     GL_ARB_pipeline_statistics_query 
     GL_ARB_spirv_extensions 
     GL_ARB_point_sprite 
     GL_ARB_ES2_compatibility 
     GL_EXT_stencil_two_side 
     GL_ARB_geometry_shader4 
     GL_EXT_clip_volume_hint 
     GL_EXT_texture_sRGB_decode 
     GL_ARB_polygon_offset_clamp 
     GL_ARB_map_buffer_range 
     GL_ARB_robustness 
     GL_ARB_compressed_texture_pixel_storage 
     GL_ARB_shader_group_vote 
     GL_ARB_cl_event 
     GL_ARB_indirect_parameters 
     GL_ARB_transform_feedback_overflow_query 
     GL_ARB_texture_rg 
     GL_ARB_compatibility 
     GL_EXT_packed_float 
     GL_ARB_texture_rectangle 
     GL_KHR_shader_subgroup_shuffle 
     GL_KHR_shader_subgroup_shuffle_relative 
     GL_ARB_sampler_objects 
     GL_ARB_shader_image_load_store 
     GL_ARB_texture_float 
     GL_ARB_texture_query_levels 
     GL_ARB_vertex_type_10f_11f_11f_rev 
     GL_EXT_framebuffer_object 
     GL_ARB_transpose_matrix 
     GL_ARB_multi_bind 
     GL_EXT_texture_env_combine 
     GL_ARB_fragment_layer_viewport 
     GL_EXT_polygon_offset_clamp 
     GL_EXT_packed_pixels 
     GL_INTEL_multi_rate_fragment_shader 
     GL_ARB_explicit_uniform_location 
     GL_ARB_internalformat_query 
     GL_ARB_vertex_attrib_64bit 
     GL_ARB_texture_mirrored_repeat 
     GL_ARB_texture_border_clamp 
     GL_ARB_uniform_buffer_object 
     GL_EXT_depth_bounds_test 
     GL_ARB_fragment_coord_conventions 
     GL_ARB_copy_buffer 
     GL_EXT_texture_integer 
     GL_KHR_blend_equation_advanced 
     GL_ARB_shadow 
     GL_ARB_texture_rgb10_a2ui 
     GL_EXT_abgr 
     GL_NV_conditional_render 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsAngleD3D11: true 
  isQtPreferAngle: true 
  Detected renderers: 
    (Supported) ANGLE (Intel, Intel(R) UHD Graphics Direct3D11 vs_5_0 ps_5_0, D3D11-32.0.101.6790) (OpenGL ES 3.0.0 (ANGLE 2.1.0 git hash: f2280c0c5f93+krita_qt5)) 
    (Supported) Intel(R) UHD Graphics (3.3.0 - Build 32.0.101.6790) 
    (Supported) ANGLE (Microsoft, Microsoft Basic Render Driver Direct3D11 vs_5_0 ps_5_0, D3D11-10.0.26100.7309) (OpenGL ES 3.0.0 (ANGLE 2.1.0 git hash: f2280c0c5f93+krita_qt5))  

useBufferInvalidation (config option): false


Hardware Information

  GPU Acceleration: desktop
  Memory: 32394 Mb
  Number of Cores: 16
  Swap Location: C:/Users/kst/AppData/Local/Temp
  Built for: sse2
  Base instruction set: fma3+avx2
  Supported instruction sets: avxvnni fma3+avx2 avx2 fma3+avx avx fma3+sse4.2 sse4.2 sse4.1 ssse3 sse3 sse2 

Current Settings

  Current Swap Location: C:/Users/kst/AppData/Local/Temp
  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_SUCCESS
  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: C:/Users/kst/AppData/Roaming/krita
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: false
  Use Zip64: false


Loaded Python Plugins
	colorspace
	comics_project_management_tools
	documenttools
	exportlayers
	filtermanager
	lastdocumentsdocker
	plugin_importer
	quick_settings_docker
	scripter
	tenbrushes
	tenscripts


Display Information
Number of screens: 1
	Screen: 0
		Name: \\.\DISPLAY1
		Depth: 32
		Scale: 1
		Physical DPI141.585
		Logical DPI120
		Physical Size: 344, 194
		Position: 0, 0
		Resolution in pixels: 1920x1080
		Manufacturer: BOE
		Model: NE156FHM-NX6
		Refresh Rate: 60
		Serial Number:
Comment 1 KST 2026-02-04 03:35:07 UTC 
The glitches appear only in pixel engine.
Especially in brushes, that create continuous dab rather than small texture like splatter.
You can try Basic-Size, Ink Rough which are default in Krita
---
I have tried with Color smudge and Quick engine.
There was no glitches.