From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- widget/gtk/nsShmImage.cpp | 326 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 326 insertions(+) create mode 100644 widget/gtk/nsShmImage.cpp (limited to 'widget/gtk/nsShmImage.cpp') diff --git a/widget/gtk/nsShmImage.cpp b/widget/gtk/nsShmImage.cpp new file mode 100644 index 0000000000..7208b7075f --- /dev/null +++ b/widget/gtk/nsShmImage.cpp @@ -0,0 +1,326 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsShmImage.h" + +#ifdef MOZ_HAVE_SHMIMAGE +# include "mozilla/X11Util.h" +# include "mozilla/gfx/gfxVars.h" +# include "mozilla/ipc/SharedMemory.h" +# include "gfxPlatform.h" +# include "nsPrintfCString.h" +# include "nsTArray.h" + +# include +# include +# include +# include +# include + +extern "C" { +# include +} + +using namespace mozilla::ipc; +using namespace mozilla::gfx; + +nsShmImage::nsShmImage(Display* aDisplay, Drawable aWindow, Visual* aVisual, + unsigned int aDepth) + : mDisplay(aDisplay), + mConnection(XGetXCBConnection(aDisplay)), + mWindow(aWindow), + mVisual(aVisual), + mDepth(aDepth), + mFormat(mozilla::gfx::SurfaceFormat::UNKNOWN), + mSize(0, 0), + mStride(0), + mPixmap(XCB_NONE), + mGC(XCB_NONE), + mRequestPending(false), + mShmSeg(XCB_NONE), + mShmId(-1), + mShmAddr(nullptr) { + mozilla::PodZero(&mSyncRequest); +} + +nsShmImage::~nsShmImage() { DestroyImage(); } + +// If XShm isn't available to our client, we'll try XShm once, fail, +// set this to false and then never try again. +static bool gShmAvailable = true; +bool nsShmImage::UseShm() { return gShmAvailable; } + +bool nsShmImage::CreateShmSegment() { + size_t size = SharedMemory::PageAlignedSize(mStride * mSize.height); + +# if defined(__OpenBSD__) && defined(MOZ_SANDBOX) + static mozilla::LazyLogModule sPledgeLog("SandboxPledge"); + MOZ_LOG(sPledgeLog, mozilla::LogLevel::Debug, + ("%s called when pledged, returning false\n", __func__)); + return false; +# endif + mShmId = shmget(IPC_PRIVATE, size, IPC_CREAT | 0600); + if (mShmId == -1) { + return false; + } + mShmAddr = (uint8_t*)shmat(mShmId, nullptr, 0); + mShmSeg = xcb_generate_id(mConnection); + + // Mark the handle removed so that it will destroy the segment when unmapped. + shmctl(mShmId, IPC_RMID, nullptr); + + if (mShmAddr == (void*)-1) { + // Since mapping failed, the segment is already destroyed. + mShmId = -1; + + nsPrintfCString warning("shmat(): %s (%d)\n", strerror(errno), errno); + NS_WARNING(warning.get()); + return false; + } + +# ifdef DEBUG + struct shmid_ds info; + if (shmctl(mShmId, IPC_STAT, &info) < 0) { + return false; + } + + MOZ_ASSERT(size <= info.shm_segsz, "Segment doesn't have enough space!"); +# endif + + return true; +} + +void nsShmImage::DestroyShmSegment() { + if (mShmId != -1) { + shmdt(mShmAddr); + mShmId = -1; + } +} + +static bool gShmInitialized = false; +static bool gUseShmPixmaps = false; + +bool nsShmImage::InitExtension() { + if (gShmInitialized) { + return gShmAvailable; + } + + gShmInitialized = true; + + // Bugs 1397918, 1293474 - race condition in libxcb fixed upstream as of + // version 1.11. Since we can't query libxcb's version directly, the only + // other option is to check for symbols that were added after 1.11. + // xcb_discard_reply64 was added in 1.11.1, so check for existence of + // that to verify we are using a version of libxcb with the bug fixed. + // Otherwise, we can't risk using libxcb due to aforementioned crashes. + if (!dlsym(RTLD_DEFAULT, "xcb_discard_reply64")) { + gShmAvailable = false; + return false; + } + + const xcb_query_extension_reply_t* extReply; + extReply = xcb_get_extension_data(mConnection, &xcb_shm_id); + if (!extReply || !extReply->present) { + gShmAvailable = false; + return false; + } + + xcb_shm_query_version_reply_t* shmReply = xcb_shm_query_version_reply( + mConnection, xcb_shm_query_version(mConnection), nullptr); + + if (!shmReply) { + gShmAvailable = false; + return false; + } + + gUseShmPixmaps = shmReply->shared_pixmaps && + shmReply->pixmap_format == XCB_IMAGE_FORMAT_Z_PIXMAP; + + free(shmReply); + + return true; +} + +bool nsShmImage::CreateImage(const IntSize& aSize) { + MOZ_ASSERT(mConnection && mVisual); + + if (!InitExtension()) { + return false; + } + + mSize = aSize; + + BackendType backend = gfxVars::ContentBackend(); + + mFormat = SurfaceFormat::UNKNOWN; + switch (mDepth) { + case 32: + if (mVisual->red_mask == 0xff0000 && mVisual->green_mask == 0xff00 && + mVisual->blue_mask == 0xff) { + mFormat = SurfaceFormat::B8G8R8A8; + } + break; + case 24: + // Only support the BGRX layout, and report it as BGRA to the compositor. + // The alpha channel will be discarded when we put the image. + // Cairo/pixman lacks some fast paths for compositing BGRX onto BGRA, so + // just report it as BGRX directly in that case. + if (mVisual->red_mask == 0xff0000 && mVisual->green_mask == 0xff00 && + mVisual->blue_mask == 0xff) { + mFormat = backend == BackendType::CAIRO ? SurfaceFormat::B8G8R8X8 + : SurfaceFormat::B8G8R8A8; + } + break; + case 16: + if (mVisual->red_mask == 0xf800 && mVisual->green_mask == 0x07e0 && + mVisual->blue_mask == 0x1f) { + mFormat = SurfaceFormat::R5G6B5_UINT16; + } + break; + } + + if (mFormat == SurfaceFormat::UNKNOWN) { + NS_WARNING("Unsupported XShm Image format!"); + gShmAvailable = false; + return false; + } + + // Round up stride to the display's scanline pad (in bits) as XShm expects. + int scanlinePad = _XGetScanlinePad(mDisplay, mDepth); + int bitsPerPixel = _XGetBitsPerPixel(mDisplay, mDepth); + int bitsPerLine = + ((bitsPerPixel * aSize.width + scanlinePad - 1) / scanlinePad) * + scanlinePad; + mStride = bitsPerLine / 8; + + if (!CreateShmSegment()) { + DestroyImage(); + return false; + } + + xcb_generic_error_t* error; + xcb_void_cookie_t cookie; + + cookie = xcb_shm_attach_checked(mConnection, mShmSeg, mShmId, 0); + + if ((error = xcb_request_check(mConnection, cookie))) { + NS_WARNING("Failed to attach MIT-SHM segment."); + DestroyImage(); + gShmAvailable = false; + free(error); + return false; + } + + if (gUseShmPixmaps) { + mPixmap = xcb_generate_id(mConnection); + cookie = xcb_shm_create_pixmap_checked(mConnection, mPixmap, mWindow, + aSize.width, aSize.height, mDepth, + mShmSeg, 0); + + if ((error = xcb_request_check(mConnection, cookie))) { + // Disable shared pixmaps permanently if creation failed. + mPixmap = XCB_NONE; + gUseShmPixmaps = false; + free(error); + } + } + + return true; +} + +void nsShmImage::DestroyImage() { + if (mGC) { + xcb_free_gc(mConnection, mGC); + mGC = XCB_NONE; + } + if (mPixmap != XCB_NONE) { + xcb_free_pixmap(mConnection, mPixmap); + mPixmap = XCB_NONE; + } + if (mShmSeg != XCB_NONE) { + xcb_shm_detach_checked(mConnection, mShmSeg); + mShmSeg = XCB_NONE; + } + DestroyShmSegment(); + // Avoid leaking any pending reply. No real need to wait but CentOS 6 build + // machines don't have xcb_discard_reply(). + WaitIfPendingReply(); +} + +// Wait for any in-flight shm-affected requests to complete. +// Typically X clients would wait for a XShmCompletionEvent to be received, +// but this works as it's sent immediately after the request is sent. +void nsShmImage::WaitIfPendingReply() { + if (mRequestPending) { + xcb_get_input_focus_reply_t* reply = + xcb_get_input_focus_reply(mConnection, mSyncRequest, nullptr); + free(reply); + mRequestPending = false; + } +} + +already_AddRefed nsShmImage::CreateDrawTarget( + const mozilla::LayoutDeviceIntRegion& aRegion) { + WaitIfPendingReply(); + + // Due to bug 1205045, we must avoid making GTK calls off the main thread to + // query window size. Instead we just track the largest offset within the + // image we are drawing to and grow the image to accomodate it. Since usually + // the entire window is invalidated on the first paint to it, this should grow + // the image to the necessary size quickly without many intermediate + // reallocations. + IntRect bounds = aRegion.GetBounds().ToUnknownRect(); + IntSize size(bounds.XMost(), bounds.YMost()); + if (size.width > mSize.width || size.height > mSize.height) { + DestroyImage(); + if (!CreateImage(size)) { + return nullptr; + } + } + + return gfxPlatform::CreateDrawTargetForData( + reinterpret_cast(mShmAddr) + bounds.y * mStride + + bounds.x * BytesPerPixel(mFormat), + bounds.Size(), mStride, mFormat); +} + +void nsShmImage::Put(const mozilla::LayoutDeviceIntRegion& aRegion) { + AutoTArray xrects; + xrects.SetCapacity(aRegion.GetNumRects()); + + for (auto iter = aRegion.RectIter(); !iter.Done(); iter.Next()) { + const mozilla::LayoutDeviceIntRect& r = iter.Get(); + xcb_rectangle_t xrect = {(short)r.x, (short)r.y, (unsigned short)r.width, + (unsigned short)r.height}; + xrects.AppendElement(xrect); + } + + if (!mGC) { + mGC = xcb_generate_id(mConnection); + xcb_create_gc(mConnection, mGC, mWindow, 0, nullptr); + } + + xcb_set_clip_rectangles(mConnection, XCB_CLIP_ORDERING_YX_BANDED, mGC, 0, 0, + xrects.Length(), xrects.Elements()); + + if (mPixmap != XCB_NONE) { + xcb_copy_area(mConnection, mPixmap, mWindow, mGC, 0, 0, 0, 0, mSize.width, + mSize.height); + } else { + xcb_shm_put_image(mConnection, mWindow, mGC, mSize.width, mSize.height, 0, + 0, mSize.width, mSize.height, 0, 0, mDepth, + XCB_IMAGE_FORMAT_Z_PIXMAP, 0, mShmSeg, 0); + } + + // Send a request that returns a response so that we don't have to start a + // sync in nsShmImage::CreateDrawTarget. + mSyncRequest = xcb_get_input_focus(mConnection); + mRequestPending = true; + + xcb_flush(mConnection); +} + +#endif // MOZ_HAVE_SHMIMAGE -- cgit v1.2.3