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//XShm driver for Xorg
//Note that on composited displays, the alpha bits will allow translucency underneath the active window
//As this is not a feature of ruby, this driver must always set the alpha bits on clear() and refresh()
//Linear interpolation is only applied horizontally for performance reasons, although Nearest is still much faster
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
struct VideoXShm : Video {
~VideoXShm() { term(); }
struct Device {
Display* display = nullptr;
signed screen = 0;
signed depth = 0;
Visual* visual = nullptr;
Window window = 0;
XShmSegmentInfo shmInfo;
XImage* image = nullptr;
uint32_t* buffer = nullptr;
unsigned width = 0;
unsigned height = 0;
} device;
struct Settings {
uintptr_t handle = 0;
unsigned filter = Video::FilterLinear;
uint32_t* buffer = nullptr;
unsigned width = 0;
unsigned height = 0;
} settings;
auto cap(const string& name) -> bool {
if(name == Video::Handle) return true;
if(name == Video::Filter) return true;
return false;
}
auto get(const string& name) -> any {
if(name == Video::Handle) return settings.handle;
if(name == Video::Filter) return settings.filter;
return {};
}
auto set(const string& name, const any& value) -> bool {
if(name == Video::Handle && value.is<uintptr_t>()) {
settings.handle = value.get<uintptr_t>();
return true;
}
if(name == Video::Filter && value.is<unsigned>()) {
settings.filter = value.get<unsigned>();
return true;
}
return false;
}
auto lock(uint32_t*& data, unsigned& pitch, unsigned width, unsigned height) -> bool {
if(settings.buffer == nullptr || settings.width != width || settings.height != height) {
if(settings.buffer) delete[] settings.buffer;
settings.width = width, settings.height = height;
settings.buffer = new uint32_t[width * height + 16]; //+16 is padding for linear interpolation
}
data = settings.buffer;
pitch = settings.width * sizeof(uint32_t);
return true;
}
auto unlock() -> void {
}
auto clear() -> void {
if(settings.buffer == nullptr) return;
uint32_t* dp = settings.buffer;
unsigned length = settings.width * settings.height;
while(length--) *dp++ = 255u << 24;
refresh();
}
auto refresh() -> void {
if(settings.buffer == nullptr) return;
size();
float xratio = (float)settings.width / (float)device.width;
float yratio = (float)settings.height / (float)device.height;
#pragma omp parallel for
for(unsigned y = 0; y < device.height; y++) {
float ystep = y * yratio;
float xstep = 0;
uint32_t* sp = settings.buffer + (unsigned)ystep * settings.width;
uint32_t* dp = device.buffer + y * device.width;
if(settings.filter == Video::FilterNearest) {
for(unsigned x = 0; x < device.width; x++) {
*dp++ = 255u << 24 | sp[(unsigned)xstep];
xstep += xratio;
}
} else { //settings.filter == Video::FilterLinear
for(unsigned x = 0; x < device.width; x++) {
*dp++ = 255u << 24 | interpolate(xstep - (unsigned)xstep, sp[(unsigned)xstep], sp[(unsigned)xstep + 1]);
xstep += xratio;
}
}
}
GC gc = XCreateGC(device.display, device.window, 0, 0);
XShmPutImage(
device.display, device.window, gc, device.image,
0, 0, 0, 0, device.width, device.height, False
);
XFreeGC(device.display, gc);
XFlush(device.display);
}
auto init() -> bool {
device.display = XOpenDisplay(0);
device.screen = DefaultScreen(device.display);
XWindowAttributes getAttributes;
XGetWindowAttributes(device.display, (Window)settings.handle, &getAttributes);
device.depth = getAttributes.depth;
device.visual = getAttributes.visual;
//driver only supports 32-bit pixels
//note that even on 15-bit and 16-bit displays, the window visual's depth should be 32
if(device.depth < 24 || device.depth > 32) {
free();
return false;
}
XSetWindowAttributes setAttributes = {0};
setAttributes.border_pixel = 0;
device.window = XCreateWindow(device.display, (Window)settings.handle,
0, 0, 256, 256, 0,
getAttributes.depth, InputOutput, getAttributes.visual,
CWBorderPixel, &setAttributes
);
XSetWindowBackground(device.display, device.window, 0);
XMapWindow(device.display, device.window);
XFlush(device.display);
while(XPending(device.display)) {
XEvent event;
XNextEvent(device.display, &event);
}
if(size() == false) return false;
return true;
}
auto term() -> void {
free();
if(device.display) {
XCloseDisplay(device.display);
device.display = nullptr;
}
}
private:
auto size() -> bool {
XWindowAttributes windowAttributes;
XGetWindowAttributes(device.display, settings.handle, &windowAttributes);
if(device.buffer && device.width == windowAttributes.width && device.height == windowAttributes.height) return true;
device.width = windowAttributes.width, device.height = windowAttributes.height;
XResizeWindow(device.display, device.window, device.width, device.height);
free();
device.shmInfo.shmid = shmget(IPC_PRIVATE, device.width * device.height * sizeof(uint32_t), IPC_CREAT | 0777);
if(device.shmInfo.shmid < 0) return false;
device.shmInfo.shmaddr = (char*)shmat(device.shmInfo.shmid, 0, 0);
device.shmInfo.readOnly = False;
XShmAttach(device.display, &device.shmInfo);
device.buffer = (uint32_t*)device.shmInfo.shmaddr;
device.image = XShmCreateImage(device.display, device.visual, device.depth,
ZPixmap, device.shmInfo.shmaddr, &device.shmInfo, device.width, device.height
);
return true;
}
auto free() -> void {
if(device.buffer == nullptr) return;
device.buffer = nullptr;
XShmDetach(device.display, &device.shmInfo);
XDestroyImage(device.image);
shmdt(device.shmInfo.shmaddr);
shmctl(device.shmInfo.shmid, IPC_RMID, 0);
}
alwaysinline auto interpolate(float mu, uint32_t a, uint32_t b) -> uint32_t {
uint8_t ar = a >> 16, ag = a >> 8, ab = a >> 0;
uint8_t br = b >> 16, bg = b >> 8, bb = b >> 0;
uint8_t cr = ar * (1.0 - mu) + br * mu;
uint8_t cg = ag * (1.0 - mu) + bg * mu;
uint8_t cb = ab * (1.0 - mu) + bb * mu;
return cr << 16 | cg << 8 | cb << 0;
}
};
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