User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0 Build ID: 20171006100327 Steps to reproduce: 1. Create a new Firefox profile 2. Enable: turn on gfx.webrender.enabled turn on gfx.webrendest.enabled turn on gfx.webrender.layers-free turn on gfx.webrender.blob-images 3. Navigate to https://mozillagfx.wordpress.com/2017/09/25/webrender-newsletter-5/ 4. Compare with a fresh profile without these changes Actual results: The WebRender profile is noticeably and obviously blurrier than the non-webrender profile. This is also seen in the addressbar, in addition to the web page. Screenshot attached; WebRender enabled on right window. Expected results: Text quality should be the same when WebRender is enabled. Troubleshooting info: Application Basics ------------------ Name: Firefox Version: 58.0a1 Build ID: 20171006100327 Update Channel: nightly User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0 OS: Windows_NT 10.0 Multiprocess Windows: 1/1 (Enabled by default) Web Content Processes: 2/4 Stylo: true (enabled by default) Google Key: Found Mozilla Location Service Key: Found Safe Mode: false Crash Reports for the Last 3 Days --------------------------------- Report ID: bp-e8115644-a0cb-4cc9-a9c2-9a09c0171006 Submitted: 11 hours ago All Crash Reports Nightly Features ---------------- Name: Activity Stream Version: 2017.09.29.0895-52552f5e ID: activity-stream@mozilla.org Name: Application Update Service Helper Version: 2.0 ID: aushelper@mozilla.org Name: Firefox Screenshots Version: 19.1.0 ID: screenshots@mozilla.org Name: FlyWeb Version: 1.0.0 ID: flyweb@mozilla.org Name: Follow-on Search Telemetry Version: 0.9.3 ID: followonsearch@mozilla.com Name: Form Autofill Version: 1.0 ID: formautofill@mozilla.org Name: Multi-process staged rollout Version: 3.05 ID: e10srollout@mozilla.org Name: Photon onboarding Version: 0.1 ID: onboarding@mozilla.org Name: Pocket Version: 1.0.5 ID: firefox@getpocket.com Name: Presentation Version: 1.0.0 ID: presentation@mozilla.org Name: Shield Recipe Client Version: 76 ID: shield-recipe-client@mozilla.org Name: TLS 1.3 Compatibility Testing of Middleboxes Version: 1.0.0 ID: tls13-middlebox-serverhello@mozilla.org Name: Web Compat Version: 1.1 ID: webcompat@mozilla.org Name: WebCompat Reporter Version: 1.0.0 ID: webcompat-reporter@mozilla.org Extensions ---------- Graphics -------- Features Compositing: WebRender Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled WebGL 1 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 000000000000b28a) EGL_VERSION: 1.4 (ANGLE 2.1.0.dec065540d5f) EGL_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_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses WebGL 1 Driver Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 3000 Direct3D11 vs_4_1 ps_4_1) WebGL 1 Driver Version: OpenGL ES 2.0 (ANGLE 2.1.0.dec065540d5f) WebGL 1 Driver Extensions: 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_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_filter_anisotropic GL_EXT_texture_format_BGRA8888 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_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 WebGL 1 Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_frag_depth EXT_sRGB EXT_shader_texture_lod EXT_texture_filter_anisotropic EXT_disjoint_timer_query OES_element_index_uint OES_standard_derivatives OES_texture_float OES_texture_float_linear OES_texture_half_float OES_texture_half_float_linear OES_vertex_array_object WEBGL_color_buffer_float WEBGL_compressed_texture_s3tc WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_depth_texture WEBGL_draw_buffers WEBGL_lose_context WebGL 2 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 000000000000b28a) EGL_VERSION: 1.4 (ANGLE 2.1.0.dec065540d5f) EGL_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_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses WebGL 2 Driver Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 3000 Direct3D11 vs_4_1 ps_4_1) WebGL 2 Driver Version: OpenGL ES 3.0 (ANGLE 2.1.0.dec065540d5f) WebGL 2 Driver Extensions: 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_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 WebGL 2 Extensions: EXT_color_buffer_float EXT_texture_filter_anisotropic EXT_disjoint_timer_query OES_texture_float_linear WEBGL_compressed_texture_s3tc WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context Direct2D: true Off Main Thread Painting Enabled: true DirectWrite: true (10.0.15063.483) GPU #1 Active: Yes Description: Intel(R) HD Graphics 3000 Vendor ID: 0x8086 Device ID: 0x0116 Driver Version: 9.17.10.4459 Driver Date: 5-19-2016 Drivers: igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32 Subsys ID: 397517aa RAM: Unknown Diagnostics ClearType Parameters: Gamma: 2.2 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 AzureCanvasAccelerated: 0 AzureCanvasBackend: Direct2D 1.1 AzureCanvasBackend (UI Process): skia AzureContentBackend: Direct2D 1.1 AzureContentBackend (UI Process): skia AzureFallbackCanvasBackend (UI Process): cairo GPUProcessPid: 7248 GPUProcess: Terminate GPU Process Device Reset: Trigger Device Reset ClearType Parameters: Gamma: 2.2 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 Decision Log WEBRENDER: opt-in by default: WebRender is an opt-in feature available by user: Enabled by pref Workarounds NO_CONSTANT_BUFFER_OFFSETTING: Constant buffer offset binding does not work Media ----- Audio Backend: wasapi Max Channels: 2 Preferred Channel Layout: stereo Preferred Sample Rate: 48000 Output Devices Name: Group Speakers (High Definition Audio Device): HDAUDIO\FUNC_01&VEN_10EC&DEV_0272&SUBSYS_17AA6014&REV_1000\4&245e8196&0&0001 Speakers (High Definition Audio Device): HDAUDIO\FUNC_01&VEN_10EC&DEV_0272&SUBSYS_17AA6014&REV_1000\4&245e8196&0&0001 Digital Audio (HDMI) (2- High Definition Audio Device): HDAUDIO\FUNC_01&VEN_8086&DEV_2805&SUBSYS_80860101&REV_1000\4&245e8196&0&0301 Internal AUX Jack (High Definition Audio Device): HDAUDIO\FUNC_01&VEN_10EC&DEV_0272&SUBSYS_17AA6014&REV_1000\4&245e8196&0&0001 Input Devices Name: Group Microphone (High Definition Audio Device): HDAUDIO\FUNC_01&VEN_10EC&DEV_0272&SUBSYS_17AA6014&REV_1000\4&245e8196&0&0001 Microphone (High Definition Audio Device): HDAUDIO\FUNC_01&VEN_10EC&DEV_0272&SUBSYS_17AA6014&REV_1000\4&245e8196&0&0001 Internal AUX Jack (2- High Definition Audio Device): HDAUDIO\FUNC_01&VEN_8086&DEV_2805&SUBSYS_80860101&REV_1000\4&245e8196&0&0301 Important Modified Preferences ------------------------------ browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.smart_size.first_run: false browser.cache.frecency_experiment: 1 browser.places.smartBookmarksVersion: 8 browser.sessionstore.upgradeBackup.latestBuildID: 20171006100327 browser.startup.homepage_override.buildID: 20171006100327 browser.startup.homepage_override.mstone: 58.0a1 browser.urlbar.lastSuggestionsPromptDate: 20171006 browser.urlbar.timesBeforeHidingSuggestionsHint: 0 dom.forms.autocomplete.formautofill: true extensions.lastAppVersion: 58.0a1 gfx.webrender.blob-images: true gfx.webrender.enabled: true gfx.webrendest.enabled: true layers.mlgpu.sanity-test-failed: false media.gmp-gmpopenh264.abi: x86_64-msvc-x64 media.gmp-gmpopenh264.lastUpdate: 1507308867 media.gmp-gmpopenh264.version: 1.6 media.gmp-widevinecdm.abi: x86_64-msvc-x64 media.gmp-widevinecdm.lastUpdate: 1507308868 media.gmp-widevinecdm.version: 1.4.8.1008 media.gmp.storage.version.observed: 1 media.hardware-video-decoding.failed: false network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf security.sandbox.content.tempDirSuffix: {e6fdf594-a160-48eb-bfb1-d8a0a4e1d84c} services.sync.engine.addresses.available: true ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found. Important Locked Preferences ---------------------------- Places Database --------------- JavaScript ---------- Incremental GC: true Accessibility ------------- Activated: false Prevent Accessibility: 0 Accessible Handler Used: true Accessibility Instantiator: Library Versions ---------------- NSPR Expected minimum version: 4.17 Version in use: 4.17 NSS Expected minimum version: 3.34 Beta Version in use: 3.34 Beta NSSSMIME Expected minimum version: 3.34 Beta Version in use: 3.34 Beta NSSSSL Expected minimum version: 3.34 Beta Version in use: 3.34 Beta NSSUTIL Expected minimum version: 3.34 Beta Version in use: 3.34 Beta Experimental Features --------------------- Sandbox ------- Content Process Sandbox Level: 4 Effective Content Process Sandbox Level: 4

Lee found the bug: we're accidentally swapping the red and the blue color channel. He has a fix in https://github.com/servo/webrender/pull/1969 .

Fixed by the webrender update in bug 1413178.

It looks like this is still happening.

Is this the same patch that will fix what looks like text on some sites being darker than they should? Wikipedia.com is one example of darker fonts.

It's not clear to me at this point.

Text is darker with WR enabled.

Fixed by WR PR https://github.com/servo/webrender/pull/1997

I can confirm builds 57.0 and 58.0b5 are unaffected, I verified using Win 8.1 x64 and Win 10 x64.