57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
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// Framebuffer snapshot shim: preloaded into xochitl, it captures the e-paper
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// framebuffer (via setBuffers) and, when the trigger file /tmp/fbdump appears,
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// saves the current framebuffer to /home/root/fbdump.png. Used to recover the
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// real Calligraphy nib angle by measuring xochitl's actual rendered strokes.
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#define _GNU_SOURCE 1
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#include <QImage>
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#include <tuple>
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#include <dlfcn.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <cstdio>
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namespace {
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uchar *g_bits = nullptr;
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int g_w = 0, g_h = 0, g_bpl = 0, g_fmt = 0;
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bool g_started = false;
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void *dumper(void *)
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{
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fprintf(stderr, "FBSHIM dumper thread started\n");
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for (;;) {
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usleep(400000);
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struct stat st;
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if (g_bits && stat("/tmp/fbdump", &st) == 0) {
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QImage snap = QImage(g_bits, g_w, g_h, g_bpl, QImage::Format(g_fmt)).copy();
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bool ok = snap.save("/home/root/fbdump.png");
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if (!ok) ok = snap.save("/home/root/fbdump.bmp", "BMP");
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::unlink("/tmp/fbdump");
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fprintf(stderr, "FBDUMP %dx%d saved ok=%d\n", g_w, g_h, int(ok));
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}
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}
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return nullptr;
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}
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}
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extern "C" void _ZN13EPFramebuffer10setBuffersESt5tupleIJ6QImageS1_EEPS1_(
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void *self, void *tuplePtr, void *imgPtr)
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{
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static void (*real)(void *, void *, void *) = nullptr;
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if (!real)
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real = (void (*)(void *, void *, void *))dlsym(
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RTLD_NEXT, "_ZN13EPFramebuffer10setBuffersESt5tupleIJ6QImageS1_EEPS1_");
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auto *t = reinterpret_cast<std::tuple<QImage, QImage> *>(tuplePtr);
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const QImage &a = std::get<0>(*t);
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g_bits = const_cast<uchar *>(a.constBits());
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g_w = a.width(); g_h = a.height(); g_bpl = a.bytesPerLine(); g_fmt = int(a.format());
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fprintf(stderr, "FBSHIM setBuffers %dx%d fmt=%d\n", g_w, g_h, g_fmt);
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if (!g_started) {
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g_started = true;
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pthread_t th;
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pthread_create(&th, nullptr, dumper, nullptr);
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}
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if (real) real(self, tuplePtr, imgPtr);
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}
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