Created attachment 145874 [details] Example KO with fuzzy canvas (trilinear filtering) SUMMARY In some situation, canvas is fuzzy/blurry. The case occurs when Canvas Graphics Acceleration is enabled, with Open GL, for *trilinear filtering* and *high quality filtering* modes. With *bilinear filtering* and *nearest neighbour* everything is fine. STEPS TO REPRODUCE There's different method to reproduce it (painting, move tool, ...) Here's the "move tool" steps (easy to reproduce and easy to check the problem): 1) create a big document (A4 @ 600dpi here) 2) zoom to fit 3) draw some abstract thing with *b) basic-5* brush for example 4) select move tool 5) start to move 6) zoom in ==> canvas is fuzzy, and it's not possible to work with displayed content 7) select another layer/go back to current layer 8) start to move: canvas is now properly rendered OBSERVED RESULT If *trilinear filtering* or *high quality filtering* is active, on step 7) canvas is fuzzy/blurry If *bilinear filtering* or *nearest neighbour* is active, on step 7) canvas is properly rendered EXPECTED RESULT In all case, whatever the scale filter applied, the canvas must be properly rendered SOFTWARE/OS VERSIONS ------------------------------------------------ Krita Version: 5.0.2 Languages: en_GB, en, fr, en_GB, en Hidpi: false Qt Version (compiled): 5.12.12 Version (loaded): 5.12.12 OS Information Build ABI: x86_64-little_endian-lp64 Build CPU: x86_64 CPU: x86_64 Kernel Type: linux Kernel Version: 4.19.0-18-amd64 Pretty Productname: Debian GNU/Linux 10 (buster) Product Type: debian Product Version: 10 Desktop: KDE OpenGL Info Vendor: "NVIDIA Corporation" Renderer: "GeForce GTX 1060 3GB/PCIe/SSE2" Version: "4.6.0 NVIDIA 418.211.00" 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::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::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::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::CompatibilityProfile) Version: 4.6 Supports deprecated functions true is OpenGL ES: false supportsBufferMapping: true supportsBufferInvalidation: true Extensions: "GL_EXT_memory_object_fd" "GL_IBM_texture_mirrored_repeat" "GL_ARB_internalformat_query" "GL_KHR_debug" "GL_NV_register_combiners2" "GL_ARB_viewport_array" "GL_NV_bindless_multi_draw_indirect_count" "GL_NV_register_combiners" "GL_KTX_buffer_region" "GL_ARB_ES3_compatibility" "GL_ARB_blend_func_extended" "GL_ATI_draw_buffers" "GL_NV_vertex_program" "GL_ARB_gpu_shader5" "GL_ARB_framebuffer_sRGB" "GL_ARB_sample_locations" "GL_ARB_base_instance" "GL_EXT_fog_coord" "GL_NV_fill_rectangle" "GL_EXT_framebuffer_multisample_blit_scaled" "GL_NV_gpu_program4" "GL_ARB_fragment_layer_viewport" "GL_NV_parameter_buffer_object2" "GL_ARB_shader_atomic_counter_ops" "GL_NV_conservative_raster" "GL_NV_blend_minmax_factor" "GL_NV_gpu_shader5" "GL_ARB_texture_env_combine" "GL_NV_packed_depth_stencil" "GL_ARB_post_depth_coverage" "GL_ARB_texture_compression_bptc" "GL_ARB_half_float_vertex" "GL_NVX_blend_equation_advanced_multi_draw_buffers" "GL_ARB_draw_buffers" "GL_ARB_shadow" "GL_NV_copy_depth_to_color" "GL_ARB_vertex_array_object" "GL_NV_compute_program5" "GL_NV_vertex_buffer_unified_memory" "GL_ARB_texture_query_lod" "GL_NV_fragment_program_option" "GL_ARB_derivative_control" "GL_NV_shader_thread_shuffle" "GL_NV_viewport_swizzle" "GL_ARB_texture_query_levels" "GL_EXTX_framebuffer_mixed_formats" "GL_ARB_sampler_objects" "GL_ARB_transform_feedback_instanced" "GL_ARB_window_pos" "GL_NV_conservative_raster_dilate" "GL_ARB_texture_multisample" "GL_ARB_timer_query" "GL_ARB_sample_shading" "GL_ARB_draw_elements_base_vertex" "GL_ARB_conservative_depth" "GL_KHR_parallel_shader_compile" "GL_ARB_shader_atomic_counters" "GL_ARB_texture_buffer_range" "GL_EXT_gpu_program_parameters" "GL_ARB_fragment_program_shadow" "GL_EXT_framebuffer_blit" "GL_ARB_pixel_buffer_object" "GL_EXT_raster_multisample" "GL_ARB_texture_stencil8" "GL_EXT_texture_storage" "GL_ARB_robustness" "GL_ARB_shader_group_vote" "GL_ARB_compatibility" "GL_ARB_vertex_type_10f_11f_11f_rev" "GL_ARB_multi_bind" "GL_ARB_seamless_cube_map" "GL_EXT_texture_filter_minmax" "GL_ARB_compressed_texture_pixel_storage" "GL_NV_multisample_coverage" "GL_ARB_multitexture" "GL_NV_texture_multisample" "GL_EXT_separate_specular_color" "GL_NV_vertex_array_range" "GL_ARB_texture_border_clamp" "GL_EXT_texture_compression_dxt1" "GL_ARB_point_parameters" "GL_ARB_transform_feedback2" "GL_ARB_texture_mirrored_repeat" "GL_NV_gpu_program_fp64" "GL_ARB_texture_gather" "GL_NV_fragment_shader_interlock" "GL_NV_fragment_coverage_to_color" "GL_NV_shader_atomic_int64" "GL_ARB_draw_buffers_blend" "GL_NVX_gpu_memory_info" "GL_EXT_texture_sRGB_R8" "GL_ARB_texture_float" "GL_NV_memory_attachment" "GL_NV_framebuffer_multisample_coverage" "GL_NV_sample_locations" "GL_ARB_texture_env_crossbar" "GL_NV_copy_image" "GL_NV_texture_rectangle_compressed" "GL_OVR_multiview" "GL_NV_fragment_program" "GL_NV_framebuffer_mixed_samples" "GL_ARB_cull_distance" "GL_EXT_separate_shader_objects" "GL_NV_gpu_program5_mem_extended" "GL_NV_vertex_program2_option" "GL_ARB_pipeline_statistics_query" "GL_ARB_sparse_texture_clamp" "GL_ARB_clip_control" "GL_ARB_fragment_shader_interlock" "GL_ARB_texture_cube_map" "GL_EXT_texture_edge_clamp" "GL_KHR_robust_buffer_access_behavior" "GL_NV_uniform_buffer_unified_memory" "GL_EXT_texture_array" "GL_EXT_vertex_attrib_64bit" "GL_ARB_invalidate_subdata" "GL_EXT_framebuffer_multisample" "GL_ARB_spirv_extensions" "GL_NV_viewport_array2" "GL_NV_vertex_program1_1" "GL_EXT_geometry_shader4" "GL_NV_pixel_data_range" "GL_EXT_shader_integer_mix" "GL_ARB_vertex_array_bgra" "GL_NV_alpha_to_coverage_dither_control" "GL_EXT_packed_float" "GL_EXT_rescale_normal" "GL_ARB_fragment_coord_conventions" "GL_ARB_texture_cube_map_array" "GL_ARB_shader_draw_parameters" "GL_ARB_texture_filter_anisotropic" "GL_ARB_sparse_buffer" "GL_ARB_gpu_shader_int64" "GL_NV_internalformat_sample_query" "GL_ARB_texture_mirror_clamp_to_edge" "GL_ARB_ES3_2_compatibility" "GL_ARB_vertex_program" "GL_ARB_texture_compression_rgtc" "GL_EXT_draw_range_elements" "GL_ARB_clear_buffer_object" "GL_ARB_texture_rectangle" "GL_NV_shader_storage_buffer_object" "GL_ARB_texture_env_dot3" "GL_EXT_texture_mirror_clamp" "GL_NV_gpu_program5" "GL_ARB_framebuffer_object" "GL_ARB_shader_subroutine" "GL_ARB_shader_texture_lod" "GL_ARB_copy_image" "GL_ARB_texture_env_add" "GL_NV_transform_feedback" "GL_EXT_blend_equation_separate" "GL_ARB_shader_texture_image_samples" "GL_NV_path_rendering" "GL_EXT_bgra" "GL_ARB_ES3_1_compatibility" "GL_EXT_compiled_vertex_array" "GL_ARB_texture_barrier" "GL_NV_gpu_program4_1" "GL_NV_vertex_attrib_integer_64bit" "GL_KHR_blend_equation_advanced" "GL_ARB_robust_buffer_access_behavior" "GL_ARB_vertex_type_2_10_10_10_rev" "GL_ARB_internalformat_query2" "GL_NV_texture_shader3" "GL_KHR_no_error" "GL_ARB_enhanced_layouts" "GL_EXT_post_depth_coverage" "GL_EXT_texture_integer" "GL_ARB_vertex_buffer_object" "GL_ARB_shader_precision" "GL_ARB_ES2_compatibility" "GL_NV_vdpau_interop2" "GL_EXT_x11_sync_object" "GL_ARB_shader_clock" "GL_ARB_draw_indirect" "GL_ATI_texture_mirror_once" "GL_ARB_shader_bit_encoding" "GL_NV_texture_rectangle" "GL_ARB_program_interface_query" "GL_ARB_shader_ballot" "GL_ARB_tessellation_shader" "GL_ARB_sparse_texture" "GL_NV_depth_clamp" "GL_ARB_depth_buffer_float" "GL_ARB_texture_storage" "GL_EXT_gpu_shader4" "GL_EXT_texture_lod_bias" "GL_NV_conservative_raster_pre_snap_triangles" "GL_NV_transform_feedback2" "GL_NV_blend_square" "GL_ARB_explicit_attrib_location" "GL_KHR_context_flush_control" "GL_EXT_depth_bounds_test" "GL_ARB_geometry_shader4" "GL_EXT_multi_draw_arrays" "GL_EXT_texture_env_add" "GL_AMD_vertex_shader_viewport_index" "GL_EXT_transform_feedback2" "GL_ARB_get_texture_sub_image" "GL_EXT_packed_pixels" "GL_EXT_texture_sRGB_decode" "GL_EXT_texture_compression_latc" "GL_SGIS_texture_lod" "GL_EXT_semaphore" "GL_ARB_transform_feedback_overflow_query" "GL_NV_query_resource" "GL_EXT_draw_buffers2" "GL_EXT_shadow_funcs" "GL_ARB_shader_objects" "GL_EXT_pixel_buffer_object" "GL_ARB_draw_instanced" "GL_ARB_half_float_pixel" "GL_ARB_shader_storage_buffer_object" "GL_NV_shader_atomic_counters" "GL_NV_fragment_program2" "GL_NV_shader_atomic_float" "GL_EXT_import_sync_object" "GL_ARB_shader_image_size" "GL_EXT_texture_shared_exponent" "GL_ARB_texture_buffer_object" "GL_EXT_semaphore_fd" "GL_NV_geometry_shader_passthrough" "GL_KHR_robustness" "GL_NV_blend_equation_advanced" "GL_EXT_texture_env_dot3" "GL_NV_half_float" "GL_ARB_arrays_of_arrays" "GL_NV_float_buffer" "GL_EXT_direct_state_access" "GL_ARB_texture_compression" "GL_EXT_memory_object" "GL_ARB_indirect_parameters" "GL_EXT_Cg_shader" "GL_EXT_vertex_array" "GL_NV_multisample_filter_hint" "GL_ARB_query_buffer_object" "GL_NV_ES3_1_compatibility" "GL_ARB_multisample" "GL_EXT_texture_filter_anisotropic" "GL_NV_bindless_texture" "GL_ARB_uniform_buffer_object" "GL_EXT_draw_instanced" "GL_NV_explicit_multisample" "GL_S3_s3tc" "GL_NV_texture_compression_vtc" "GL_EXT_vertex_array_bgra" "GL_ARB_point_sprite" "GL_EXT_blend_minmax" "GL_ARB_compute_variable_group_size" "GL_SGIX_shadow" "GL_EXT_provoking_vertex" "GL_ARB_framebuffer_no_attachments" "GL_ARB_shading_language_include" "GL_EXT_texture_swizzle" "GL_NV_geometry_shader4" "GL_NV_fog_distance" "GL_ARB_vertex_attrib_64bit" "GL_NV_command_list" "GL_ARB_occlusion_query2" "GL_NV_sample_mask_override_coverage" "GL_EXT_bindable_uniform" "GL_EXT_blend_func_separate" "GL_ARB_occlusion_query" "GL_NV_texture_shader" "GL_NV_vertex_program2" "GL_EXT_texture3D" "GL_NV_texture_shader2" "GL_ARB_texture_buffer_object_rgb32" "GL_EXT_framebuffer_object" "GL_ARB_explicit_uniform_location" "GL_NV_shader_atomic_float64" "GL_NVX_conditional_render" "GL_ARB_instanced_arrays" "GL_ARB_debug_output" "GL_NV_light_max_exponent" "GL_ARB_texture_rg" "GL_ARB_multi_draw_indirect" "GL_NV_vertex_program3" "GL_EXT_shader_image_load_store" "GL_ARB_transform_feedback3" "GL_NV_stereo_view_rendering" "GL_ARB_texture_filter_minmax" "GL_ARB_shading_language_100" "GL_KHR_blend_equation_advanced_coherent" "GL_EXT_polygon_offset_clamp" "GL_SGIS_generate_mipmap" "GL_ARB_sparse_texture2" "GL_ARB_vertex_attrib_binding" "GL_NV_parameter_buffer_object" "GL_ARB_texture_view" "GL_NVX_nvenc_interop" "GL_NV_blend_equation_advanced_coherent" "GL_NV_point_sprite" "GL_ARB_texture_storage_multisample" "GL_EXT_timer_query" "GL_EXT_shader_image_load_formatted" "GL_EXT_stencil_two_side" "GL_EXT_texture_compression_s3tc" "GL_NV_fence" "GL_NV_path_rendering_shared_edge" "GL_EXT_stencil_wrap" "GL_ARB_shader_viewport_layer_array" "GL_EXT_secondary_color" "GL_ARB_map_buffer_alignment" "GL_NV_draw_texture" "GL_EXT_texture_cube_map" "GL_ARB_texture_rgb10_a2ui" "GL_EXT_blend_subtract" "GL_IBM_rasterpos_clip" "GL_ARB_parallel_shader_compile" "GL_SGIX_depth_texture" "GL_ARB_gpu_shader_fp64" "GL_NV_vertex_array_range2" "GL_ARB_imaging" "GL_ARB_depth_texture" "GL_ARB_buffer_storage" "GL_NV_shader_atomic_fp16_vector" "GL_SUN_slice_accum" "GL_ARB_copy_buffer" "GL_EXT_texture_buffer_object" "GL_NV_feature_query" "GL_ARB_map_buffer_range" "GL_NV_query_resource_tag" "GL_ARB_shading_language_420pack" "GL_ARB_conditional_render_inverted" "GL_ARB_color_buffer_float" "GL_ARB_stencil_texturing" "GL_ARB_polygon_offset_clamp" "GL_NV_bindless_multi_draw_indirect" "GL_NV_texture_env_combine4" "GL_NV_primitive_restart" "GL_NV_shader_buffer_load" "GL_EXT_packed_depth_stencil" "GL_ARB_clear_texture" "GL_AMD_vertex_shader_layer" "GL_EXT_texture_object" "GL_EXT_framebuffer_sRGB" "GL_ARB_depth_clamp" "GL_EXT_window_rectangles" "GL_ARB_shader_image_load_store" "GL_EXT_sparse_texture2" "GL_NV_vdpau_interop" "GL_ARB_fragment_shader" "GL_ARB_bindless_texture" "GL_OVR_multiview2" "GL_ARB_separate_shader_objects" "GL_EXT_texture_sRGB" "GL_EXT_point_parameters" "GL_ARB_get_program_binary" "GL_ARB_seamless_cubemap_per_texture" "GL_ARB_direct_state_access" "GL_NV_draw_vulkan_image" "GL_NV_occlusion_query" "GL_ARB_vertex_shader" "GL_NV_conditional_render" "GL_AMD_seamless_cubemap_per_texture" "GL_ARB_fragment_program" "GL_ARB_texture_non_power_of_two" "GL_EXT_texture_lod" "GL_EXT_abgr" "GL_EXT_texture_compression_rgtc" "GL_NV_texgen_reflection" "GL_ARB_shading_language_packing" "GL_AMD_multi_draw_indirect" "GL_NV_ES1_1_compatibility" "GL_EXT_blend_color" "GL_ARB_compute_shader" "GL_ATI_texture_float" "GL_NV_clip_space_w_scaling" "GL_NV_shader_thread_group" "GL_NV_robustness_video_memory_purge" "GL_ARB_transpose_matrix" "GL_ARB_texture_swizzle" "GL_EXT_texture_env_combine" "GL_NV_depth_buffer_float" "GL_ARB_gl_spirv" "GL_ARB_provoking_vertex" "GL_NV_texture_barrier" "GL_ARB_sync" QPA OpenGL Detection Info supportsDesktopGL: true supportsOpenGLES: true isQtPreferOpenGLES: false useBufferInvalidation (config option): false Hardware Information GPU Acceleration: auto Memory: 64389 Mb Number of Cores: 24 Swap Location: /tmp Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: OPENGL_SUCCESS Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Display Information Number of screens: 2 Screen: 0 Name: DP-4 Depth: 24 Scale: 1 Resolution in pixels: 3840x2160 Manufacturer: ViewSonic Corporation Model: VP2780 SERIES Refresh Rate: 59 Screen: 1 Name: HDMI-0 Depth: 24 Scale: 1 Resolution in pixels: 1920x1080 Manufacturer: Iiyama North America Model: PL2410HD- Refresh Rate: 60 Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: OPENGL_SUCCESS Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: false Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: OPENGL_SUCCESS Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: false Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: false Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Current Settings Current Swap Location: /tmp Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 350 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: TRY_OPENGL Autosave Interval: 60 Use Backup Files: true Number of Backups Kept: 4 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false ------------------------------------------------ ADDITIONAL INFORMATION https://krita-artists.org/t/solved-artwork-canvas-randomly-goes-fuzzy/35715?u=grum999 Krita 4.4.8: everything works fine From the oldest Krita 5-prealpha tested (b1530e3) the problem is already here.. :-/
Created attachment 145875 [details] Example OK with canvas properly rendered (biilinear filtering)
I can Confirm this, as described, using the Jan 24 5.1.0-prealpha (git b781193) on Debian 10. The effect is less noticeable on a smaller canvas.
Seems related to bug 439156