Horizontal lines have odd antialiasing at ends of lines
Reported by
j.ing...@netcologne.de,
May 9 2017
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Issue descriptionUserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.96 Safari/537.36 Example URL: http://james-ingram.de/tests/Study2(scroll)stafflines.svg Steps to reproduce the problem: 1. Open the above link, and scroll down to the bottom of the page. What is the expected behavior? The horizontal lines should all have the same thickness throughout, and look like the lines at the top of the page. What went wrong? Lines lower down the page are rendered with strange thickness changes. See screenshot. This happens in more than one of my SVG scores. Does it occur on multiple sites: Yes Is it a problem with a plugin? No Did this work before? Yes Unknown exactly. There was no problem a few weeks ago. Does this work in other browsers? Yes Chrome version: 58.0.3029.96 Channel: stable OS Version: 10.0 Flash Version: Shockwave Flash 25.0 r0 These lines have been extracted from a larger page containing music: http://james-ingram.de/tests/Study2(scroll).svg These files looked fine a few weeks ago. They still render perfectly in Firefox.
,
May 9 2017
Really weird. On Mac I see it even on the first set of lines, so the scrolling is not the issue. What I find particularly odd is the fact that it is only at the endpoints of the lines, and not along the entire width. I'll try bisect.
,
May 9 2017
Bisects to this Skia roll. https://chromium.googlesource.com/chromium/src/+/e3693acd42860c0c30001b8735fc8d5f5c0e961e The lines are horizontal but not positioned at integral locations, so they draw as 2 pixels high in various shades of gray for anti-aliasing. In the broken case, some portion of each end of the line, on one or other of the horizontal pixel rows, is drawn as black (or much darker gray). So the bug is that the antialiasing drawing is not stable across the entire width of a horizontal line.
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May 9 2017
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Jun 2 2017
I have a desktop and a laptop, both running up-to-date Windows 10 and Chrome 58.0.3029.110 (64bit), and have just noticed that the bug only manifests itself on the laptop. Maybe that helps?
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Jun 3 2017
Contrary to Issue 718421 , this bug happens on my laptop but not on my desktop machine. I supplied the about:gpu info from the desktop machine in Issue 718421 . Here is the about:gpu info from the laptop: Graphics Feature Status Canvas: Hardware accelerated Flash: Hardware accelerated Flash Stage3D: Hardware accelerated Flash Stage3D Baseline profile: Hardware accelerated Compositing: Hardware accelerated Multiple Raster Threads: Enabled Native GpuMemoryBuffers: Software only. Hardware acceleration disabled Rasterization: Hardware accelerated Video Decode: Hardware accelerated Video Encode: Hardware accelerated VPx Video Decode: Software only, hardware acceleration unavailable WebGL: Hardware accelerated WebGL2: Hardware accelerated Driver Bug Workarounds clear_uniforms_before_first_program_use decode_encode_srgb_for_generatemipmap disable_discard_framebuffer disable_framebuffer_cmaa exit_on_context_lost force_cube_complete msaa_is_slow scalarize_vec_and_mat_constructor_args texsubimage_faster_than_teximage Problems Detected Accelerated VPx decoding is hanging on some videos.: 654111 Disabled Features: accelerated_vpx_decode Some drivers are unable to reset the D3D device in the GPU process sandbox Applied Workarounds: exit_on_context_lost TexSubImage is faster for full uploads on ANGLE Applied Workarounds: texsubimage_faster_than_teximage Clear uniforms before first program use on all platforms: 124764, 349137 Applied Workarounds: clear_uniforms_before_first_program_use Always rewrite vec/mat constructors to be consistent: 398694 Applied Workarounds: scalarize_vec_and_mat_constructor_args ANGLE crash on glReadPixels from incomplete cube map texture: 518889 Applied Workarounds: force_cube_complete On Intel GPUs MSAA performance is not acceptable for GPU rasterization: 527565 Applied Workarounds: msaa_is_slow Framebuffer discarding can hurt performance on non-tilers: 570897 Applied Workarounds: disable_discard_framebuffer Limited enabling of Chromium GL_INTEL_framebuffer_CMAA: 535198 Applied Workarounds: disable_framebuffer_cmaa Disable KHR_blend_equation_advanced until cc shaders are updated: 661715 Decode and Encode before generateMipmap for srgb format textures on Windows: 634519 Applied Workarounds: decode_encode_srgb_for_generatemipmap Native GpuMemoryBuffers have been disabled, either via about:flags or command line. Disabled Features: native_gpu_memory_buffers Version Information Data exported 6/3/2017, 12:23:20 PM Chrome version Chrome/58.0.3029.110 Operating system Windows NT 10.0.14393 Software rendering list version 12.20 Driver bug list version 9.36 ANGLE commit id 461d9a3060e3 2D graphics backend Skia/58 4c81ba6ba3a3270db809bf7d4c3bc782694a56a4 Command Line Args Files (x86)\Google\Chrome\Application\chrome.exe" --flag-switches-begin --flag-switches-end Driver Information Initialization time 129 In-process GPU false Passthrough Command Decoder false Sandboxed false GPU0 VENDOR = 0x8086, DEVICE= 0x0416 *ACTIVE* GPU1 VENDOR = 0x10de, DEVICE= 0x0fe4 Optimus false Optimus false AMD switchable false Desktop compositing Aero Glass Diagonal Monitor Size of \\.\DISPLAY1 17.5" Driver vendor Intel Corporation Driver version 10.18.15.4248 Driver date 8-4-2015 Pixel shader version 5.0 Vertex shader version 5.0 Max. MSAA samples 8 Machine model name Machine model version GL_VENDOR Google Inc. GL_RENDERER ANGLE (Intel(R) HD Graphics 4600 Direct3D11 vs_5_0 ps_5_0) GL_VERSION OpenGL ES 3.0 (ANGLE 2.1.0.461d9a3060e3) GL_EXTENSIONS GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_norm16 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object Disabled Extensions GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent Window system binding vendor Google Inc. (adapter LUID: 0000000000008ed6) Window system binding version 1.4 (ANGLE 2.1.0.461d9a3060e3) Window system binding extensions EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture_nv12 EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXT_pixel_format_float EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays Direct rendering Yes Reset notification strategy 0x8252 GPU process crash count 0 Compositor Information Tile Update Mode One-copy Partial Raster Enabled GpuMemoryBuffers Status ATC Software only ATCIA Software only DXT1 Software only DXT5 Software only ETC1 Software only R_8 Software only RG_88 Software only BGR_565 Software only RGBA_4444 Software only RGBX_8888 Software only RGBA_8888 Software only BGRX_8888 Software only BGRA_8888 Software only YVU_420 Software only YUV_420_BIPLANAR Software only UYVY_422 Software only Diagnostics 0 b3DAccelerationEnabled true b3DAccelerationExists true bAGPEnabled true bAGPExistenceValid true bAGPExists true bCanRenderWindow true bDDAccelerationEnabled true bDriverBeta false bDriverDebug false bDriverSigned false bDriverSignedValid false bNoHardware false dwBpp 32 dwDDIVersion 12 dwHeight 900 dwRefreshRate 60 dwWHQLLevel 0 dwWidth 1600 iAdapter 0 lDriverSize 37341808 lMiniVddSize 0 szAGPStatusEnglish Enabled szAGPStatusLocalized Aktiviert szChipType Intel(R) HD Graphics Family szD3DStatusEnglish Enabled szD3DStatusLocalized Aktiviert szDACType Internal szDDIVersionEnglish 12 szDDIVersionLocalized 12 szDDStatusEnglish Enabled szDDStatusLocalized Aktiviert szDXVAHDEnglish Supported szDXVAModes ModeMPEG2_A ModeMPEG2_C ModeWMV9_C ModeVC1_C szDescription Intel(R) HD Graphics 4600 szDeviceId 0x0416 szDeviceIdentifier {D7B78E66-4756-11CF-0D63-8E27BBC2C735} szDeviceName \\.\DISPLAY1 szDisplayMemoryEnglish 2160 MB szDisplayMemoryLocalized 2160 MB szDisplayModeEnglish 1600 x 900 (32 bit) (60Hz) szDisplayModeLocalized 1600 x 900 (32 bit) (60Hz) szDriverAssemblyVersion 10.18.15.4248 szDriverAttributes Final Retail szDriverDateEnglish 04.08.2015 02:00:00 szDriverDateLocalized 8/4/2015 02:00:00 szDriverLanguageEnglish English szDriverLanguageLocalized Englisch szDriverModelEnglish WDDM 2.0 szDriverModelLocalized WDDM 2.0 szDriverName igdumdim64.dll,igd10iumd64.dll,igd10iumd64.dll,igd12umd64.dll szDriverNodeStrongName oem31.inf:5f63e534dd929195:iHSWM_w10:10.18.15.4248:pci\ven_8086&dev_0416&subsys_07811025 szDriverSignDate Unknown szDriverVersion 10.18.0015.4248 szKeyDeviceID Enum\PCI\VEN_8086&DEV_0416&SUBSYS_07811025&REV_06 szKeyDeviceKey \Registry\Machine\System\CurrentControlSet\Control\Video\{ECC0596B-9A2B-4162-BBF7-395B259F08B0}\0000 szManufacturer Intel Corporation szMiniVdd Unbekannt szMiniVddDateEnglish Unknown szMiniVddDateLocalized Unbekannt szMonitorMaxRes Unknown szMonitorName Generic PnP Monitor szNotesEnglish No problems found. szNotesLocalized Es wurden keine Probleme gefunden. szOverlayEnglish Supported szRankOfInstalledDriver 00D10001 szRegHelpText Unknown szRevision Unknown szRevisionId 0x0006 szSubSysId 0x07811025 szTestResultD3D7English Not run szTestResultD3D7Localized Nicht ausgeführt szTestResultD3D8English Not run szTestResultD3D8Localized Nicht ausgeführt szTestResultD3D9English Not run szTestResultD3D9Localized Nicht ausgeführt szTestResultDDEnglish Not run szTestResultDDLocalized Nicht ausgeführt szVdd Unbekannt szVendorId 0x8086 1 b3DAccelerationEnabled true b3DAccelerationExists true bAGPEnabled true bAGPExistenceValid false bAGPExists false bCanRenderWindow false bDDAccelerationEnabled true bDriverBeta false bDriverDebug false bDriverSigned false bDriverSignedValid false bNoHardware false dwBpp 0 dwDDIVersion 12 dwHeight 0 dwRefreshRate 0 dwWHQLLevel 0 dwWidth 0 iAdapter 0 lDriverSize 17753968 lMiniVddSize 0 szAGPStatusEnglish Enabled szAGPStatusLocalized Aktiviert szChipType GeForce GT 750M szD3DStatusEnglish Enabled szD3DStatusLocalized Aktiviert szDACType Integrated RAMDAC szDDIVersionEnglish 12 szDDIVersionLocalized 12 szDDStatusEnglish Enabled szDDStatusLocalized Aktiviert szDXVAHDEnglish Unknown szDXVAModes Unknown szDescription NVIDIA GeForce GT 750M szDeviceId 0x0FE4 szDeviceIdentifier Unknown szDeviceName Unknown szDisplayMemoryEnglish 8101 MB szDisplayMemoryLocalized 8101 MB szDisplayModeEnglish Unknown szDisplayModeLocalized Unbekannt szDriverAssemblyVersion 21.21.13.7654 szDriverAttributes Final Retail szDriverDateEnglish 29.12.2016 02:00:00 szDriverDateLocalized 12/29/2016 02:00:00 szDriverLanguageEnglish English szDriverLanguageLocalized Englisch szDriverModelEnglish WDDM 2.1 szDriverModelLocalized WDDM 2.1 szDriverName C:\WINDOWS\System32\DriverStore\FileRepository\nvacwu.inf_amd64_bdd6ea477d4e2fba\nvd3dumx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvacwu.inf_amd64_bdd6ea477d4e2fba\nvwgf2umx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvacwu.inf_amd64_bdd6ea477d4e2fba\nvwgf2umx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvacwu.inf_amd64_bdd6ea477d4e2fba\nvwgf2umx.dll szDriverNodeStrongName oem4.inf:0f066de3900be5c6:Section028:21.21.13.7654:pci\ven_10de&dev_0fe4&subsys_07811025 szDriverSignDate Unknown szDriverVersion 21.21.0013.7654 szKeyDeviceID Enum\PCI\VEN_10DE&DEV_0FE4&SUBSYS_07811025&REV_A1 szKeyDeviceKey Unknown szManufacturer NVIDIA szMiniVdd Unbekannt szMiniVddDateEnglish Unknown szMiniVddDateLocalized Unbekannt szMonitorMaxRes Unknown szMonitorName Unknown szNotesEnglish No problems found. szNotesLocalized Es wurden keine Probleme gefunden. szOverlayEnglish Unknown szRankOfInstalledDriver 00D10001 szRegHelpText Unknown szRevision Unknown szRevisionId 0x00A1 szSubSysId 0x07811025 szTestResultD3D7English Not run szTestResultD3D7Localized Nicht ausgeführt szTestResultD3D8English Not run szTestResultD3D8Localized Nicht ausgeführt szTestResultD3D9English Not run szTestResultD3D9Localized Nicht ausgeführt szTestResultDDEnglish Not run szTestResultDDLocalized Nicht ausgeführt szVdd Unbekannt szVendorId 0x10DE Log Messages GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
,
Jun 5 2017
I'm not sure why this remains un-triaged for Skia.
,
Jun 13 2017
Have not been able to get a good bisect- the one in comment 3 seems bogus. cc some other folks for ideas on the AA problem
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Jun 13 2017
,
Jun 21 2017
Just tried the test page (at the top of this page) again on both desktop and laptop. When scrolled, the lines now look perfectly okay on both machines. Unfortunately I can still see the old problem while scrolling on the laptop. That still needs fixing.
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Jun 22 2017
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Dec 12 2017
Issue 793558 has been merged into this issue.
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Dec 13 2017
Contrary to Comment 10 above, I am still seeing the thicker ends of lines on both laptop and desktop. Its much worse when actually scrolling, but often still quite visible when the view is stationary. I also see the problem reported in Issue 793558 .
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Jan 2 2018
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Jan 7 2018
Thanks. I'm seeing the fix in Canary, but not yet in the current Chrome build (63.0.3239.132 (Offizieller Build) (64-Bit)). Doubtless that will change soon. :-) |
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stafflines.svg){kind=link}
.svg){kind=link}
Comment 1 by e...@chromium.org
, May 9 2017