--- /dev/null
+// gcc framebuffer_filter.c -o framebuffer_filter
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <linux/fb.h>
+#include <sys/ioctl.h>
+#include <string.h>
+
+#define MAX_DELTA 10 // Max pixel change allowed
+
+// Function to clamp a value within a certain range
+unsigned char clamp(unsigned char current, unsigned char previous) {
+ if (current > previous + MAX_DELTA)
+ return previous + MAX_DELTA;
+ else if (current < previous - MAX_DELTA)
+ return previous - MAX_DELTA;
+ else
+ return current;
+}
+
+int main() {
+ int fb_fd = open("/dev/fb0", O_RDWR);
+ if (fb_fd == -1) {
+ perror("Error: cannot open framebuffer device");
+ return 1;
+ }
+
+ struct fb_var_screeninfo vinfo;
+ if (ioctl(fb_fd, FBIOGET_VSCREENINFO, &vinfo)) {
+ perror("Error reading variable information");
+ close(fb_fd);
+ return 1;
+ }
+
+ // Calculate the screen size
+ int screensize = vinfo.yres_virtual * vinfo.xres_virtual * vinfo.bits_per_pixel / 8;
+
+ // Map framebuffer into memory
+ unsigned char *fb_ptr = (unsigned char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fb_fd, 0);
+ if ((intptr_t)fb_ptr == -1) {
+ perror("Error: failed to map framebuffer device to memory");
+ close(fb_fd);
+ return 1;
+ }
+
+ // Allocate memory for previous frame buffer
+ unsigned char *prev_frame = malloc(screensize);
+ if (!prev_frame) {
+ perror("Error: unable to allocate memory for previous frame");
+ munmap(fb_ptr, screensize);
+ close(fb_fd);
+ return 1;
+ }
+
+ // Initial copy of the framebuffer
+ memcpy(prev_frame, fb_ptr, screensize);
+
+ // Frame processing loop
+ while (1) {
+ // Process each pixel (assuming 32 bits per pixel - adjust as needed)
+ for (int i = 0; i < screensize; i += 4) {
+ // R, G, B values
+ fb_ptr[i] = clamp(fb_ptr[i], prev_frame[i]); // Blue
+ fb_ptr[i + 1] = clamp(fb_ptr[i + 1], prev_frame[i + 1]); // Green
+ fb_ptr[i + 2] = clamp(fb_ptr[i + 2], prev_frame[i + 2]); // Red
+ // fb_ptr[i + 3] = Alpha channel, leave as is or modify if necessary
+ }
+
+ // Copy current frame to previous frame for the next iteration
+ memcpy(prev_frame, fb_ptr, screensize);
+
+ // Sleep to avoid high CPU usage
+ usleep(16000); // ~60 FPS
+ }
+
+ // Clean up
+ free(prev_frame);
+ munmap(fb_ptr, screensize);
+ close(fb_fd);
+
+ return 0;
+}
--- /dev/null
+//
+// gcc -I/usr/include/libdrm drm_info.c -o transform_frame_stream -ldrm
+// ./transform_frame_stream
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+// --------------------------------------------------------------------------------
+// Pixel
+
+// These pixels have hardware support ,and thus must be packed in the order
+// expected by the hardware.
+// 0xAARRGGBB
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t blue;
+ uint8_t green;
+ uint8_t red;
+ uint8_t alpha;
+ };
+ } PixelRGBA;
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t alpha;
+ uint8_t red;
+ uint8_t green;
+ uint8_t blue;
+ };
+ } PixelRGBA;
+#else
+ #warning "Unknown __BYTE_ORDER__ found when packing a PixelRGBA."
+#endif
+
+const PixelRGBA black = {.aggregate = 0xff000000};
+const PixelRGBA white = {.aggregate = 0xffffffff};
+
+PixelRGBA·structure
+ (
+ PixelRGBA *to_px
+ ,uint8_t red
+ ,uint8_t green
+ ,uint8_t blue
+ ,uint8_t alpha
+ ){
+ px->blue = blue;
+ px->green = green;
+ px->red = red;
+ px->alpha = alpha;
+}
+PixelRGBA·destructure
+ (
+ PixelRGBA *from_px
+ ,uint8_t *red
+ ,uint8_t *green
+ ,uint8_t *blue
+ ,uint8_t *alpha
+ ){
+ *blue = from_px->blue;
+ *green = from_px->green;
+ *red = from_px->red;
+ *alpha = from_px->alpha;
+}
+
+
+// --------------------------------------------------------------------------------
+// Frame
+
+typedef struct __attribute__((packed)){
+ uint32_t width;
+ uint32_t height;
+ PixelRGBA data[];
+} FrameRGBA;
+
+FrameRGBA·alloc(int width ,int height){
+ bool null_frame = false;
+
+ if( width == 0 ){
+ fprintf(stderr, "FrameRGBA·alloc:: frame width of zero, so returning a null frame pointer\n");
+ null_frame = true;
+ }
+ if( height == 0 ){
+ fprintf(stderr, "FrameRGBA·alloc:: frame height of zero, so returning a null frame pointer\n");
+ null_frame = true;
+ }
+ if(null_frame) return NULL;
+
+ FrameRGBA *frame = malloc(sizeof(FrameRGBA));
+ if(!frame){
+ fprintf(stderr ,"FrameRGBA·alloc::failed to allocate frame\n");
+ null_frame = true;
+ }
+ frame->data = malloc( width * height * sizeof(int) );
+ if(!frame->data){
+ fprintf(stderr ,"FrameRGBA·alloc::failed to allocate frame data\n");
+ null_frame = true;
+ }
+ if(null_frame) return NULL;
+
+ frame->width = width;
+ frame->height = height;
+ return frame;
+}
+FrameRGBA·alloc_same(Frame_data *frame){
+ if(!frame) return NULL;
+ return alloc(frame->width ,frame->height);
+}
+FrameRGBA·dealloc(FrameRGBA *frame){
+ free(frame);
+}
+
+FrameRGBA·dimensions(FrameRGBA *frame ,uint32_t *width ,uint32_t *height){
+ if(!frame){
+ *width = 0;
+ *height = 0;
+ return;
+ }
+ *width = frame->width;
+ *height = frame->height;
+}
+
+// both frames have already been allocated
+FrameRGBA·copy(FrameRGBA *from_frame ,FrameRGBA **to_frame_arg){
+ if(to_frame_arg == NULL) return;
+ if(*to_frame_arg == NULL) return;
+ if( from_frame == NULL ){
+ *to_frame = NULL;
+ return;
+ }
+ FrameRGBA *to_frame = *to_frame_arg;
+
+ int32_t width, height;
+ FrameRGBA·dimensions(from_frame ,&width ,&height);
+ if(**to_frame.width < width){
+ width = to_frame.width;
+ fprintf(stderr ,"FrameRGBA·copy:: from_frame is wider than to_frame ,there will be truncation\n");
+ }else if(to_frame.width > width){
+ fprintf(stderr ,"FrameRGBA·copy:: to_frame is wider, so stale uninitialized pixels will remain at the end of scan lines.\n");
+ }
+ if(to_frame.height < height){
+ height = to_frame.height;
+ fprintf(stderr ,"FrameRGBA·copy:: from_frame is taller than to_frame ,there will be truncation\n");
+ }else if(to_frame.height > height){
+ fprintf(stderr ,"FrameRGBA·copy:: to_frame is taller, so stale or uninitialized scan lines will remain at the bottom of the frame.\n");
+ }
+
+ int32_t j = 0;
+ int32_t offset = 0;
+ do{
+ memcpy(
+ from_frame->data + offset
+ ,to_frame-data
+ ,width * sizeof(PixelRGBA)
+ );
+ offset += width;
+ j++;
+ }while(j <= height);
+}
+// if i and j walk out of frame returns NULL
+PixelRGB *FrameRGBA·access(FrameRGBA *from_frame ,uint32_t i ,uint32_t j){
+ int32_t width, height;
+ FrameRGBA·dimensions(from_frame ,&width ,&height);
+ if(i > width) return NULL;
+ if(j > height) return NULL;
+ uint32_t line_size = from_frame->width * sizeof(PixelRGB);
+ return from_frame->data + j*line_size + i*sizeof(PixelRGB);
+}
+PixelRGB FrameRGBA·read(FrameRGBA *from_frame ,uint32_t i ,uint32_t j){
+ return *FrameRGBA·access(FrameRGBA *from_frame ,uint32_t i ,uint32_t j);
+}
+void FrameRGBA·write(FrameRGBA *to_frame ,uint32_t i ,uint32_t j ,PixelRGBA px){
+ *FrameRGBA·access(FrameRGBA *from_frame ,uint32_t i ,uint32_t j) = px;
+}
+
+// search frame for condition where f returns a non-null pointer
+// f is handed successive pointers to pixels in the frame.
+// f is given the frame in case it needs context.
+// f is given an argument is it is difficult to curry functions in C.
+void *FrameRGBA·exist
+(
+ FrameRGBA *frame
+ ,void *f(FrameRGBA *frame ,PixelRGBA *px ,void *arg)
+ ,void *arg
+ ){
+
+ if(!frame) return NULL;
+
+ void *item;
+ int32_t width, height;
+ FrameRGBA·dimensions(frame ,&width ,&height);
+ int32_t i = 0;
+ int32_t j = 0;
+ do{
+ PixelRGBA *px = FrameRGBA·access(frame ,i ,j);
+ if( item=f(frame ,px ,arg) ) return item;
+
+ if(i == width){
+ i = 0;
+ j++;
+ }else{
+ i++;
+ }
+ }while(j <= height);
+ return NULL;
+}
+
+typedef struct{
+ void f(FrameRGBA *frame ,PixelRGBA *px ,void *arg) f;
+ void *arg;
+} every_arg_t;
+void *(*every_f)(FrameRGBA *frame ,PixelRGBA *px ,void *arg0){
+ every_arg_t *ea = arg0;
+ ea->f(frame ,px ,ea->arg);
+ return NULL;
+}
+void *FrameRGBA·every
+(
+ FrameRGBA *frame
+ ,void *f(FrameRGBA *frame ,PixelRGBA *px ,void *arg)
+ ,void *arg
+ ){
+ ever_arg_t ea = {.f = f ,.arg = arg};
+ FrameRGBA·exist(to_frame ,ever_f ,&ea);
+}
+
+void (*fill_f)(FrameRGBA *to_frame ,PixelRGBA *to_px ,void *arg){
+ PixelRGBA *px = arg;
+ *to_px = *px;
+ return NULL;
+}
+FrameRGBA·fill(Frame_data *to_frame ,PixelRGB *fill_px){
+ FrameRGBA·every(to_frame ,fill_f ,fill_px);
+}
+FrameRGBA·fill_black(Frame_data *to_frame){
+ FrameRGBA·fill(to_frame ,&black);
+}
+FrameRGBA·fill_white(Frame_data *to_frame){
+ FrameRGBA·fill(to_frame ,&black);
+}
+
+// --------------------------------------------------------------------------------
+// Transform functions
+// Given the previous frame, current frame, and an argument; modifies the
+// current frame.
+
+int identity_transform(FrameRGBA *prev_frame ,FrameRGBA *curr_frame ,void *args){
+ // no processing in the identity transform
+ copy_FrameRGBA(curr_frame ,prev_frame);
+ return 0; // Success
+}
+
+// --------------------------------------------------------------------------------
+// transform frame stream
+
+int transform_frame_stream(int (*transform)(FrameRGBA * ,FrameRGBA * ,void *) ,void *transform_args){
+ // Simulated screen info (would be fetched from the actual DRM system)
+ FrameRGBA *prev_frame = Framedata·alloc(3840 ,2400);
+ FrameRGBA *curr_frame = Framedata·alloc_same(prev_frame);
+
+ // Fornow ,we'll simulate grabbing the first frame by filling it with random values.
+ // In the real implementation ,you will fetch the current frame data from the DRM API.
+ for(int i = 0; i < width * height; i++){
+ curr_frame.data[i] = rand(); // Simulate grabbing a frame with random pixel data
+ }
+
+ // Call the transform function forthe first frame (identity in this case)
+ transform(&prev_frame ,&curr_frame ,transform_args);
+
+ // Main processing loop (simplified to one iteration fornow)
+ while (1){
+ // Simulate grabbing the next frame (we just reuse the current one forthis example)
+ // In real code ,you would fetch the next frame from the DRM system here.
+
+ // Call the transform function foreach new frame
+ transform(&prev_frame ,&curr_frame ,transform_args);
+
+ // Copy current frame to previous frame (fornext iteration)
+ memcpy(prev_frame.data ,curr_frame.data ,width * height * sizeof(unsigned int));
+
+ break; // Exit after one loop forthis example (replace with continuous loop in real implementation)
+ }
+
+ // Clean up memory
+ free(prev_frame.data);
+ free(curr_frame.data);
+
+ return 0; // Success
+}
+
+int main(int argc ,char **argv){
+ int fd;
+ drmModeRes *resources;
+ drmModeConnector *connector = NULL;
+ drmModeEncoder *encoder = NULL;
+ drmModeCrtc *crtc = NULL;
+
+ // Open the DRM device
+ fd = open("/dev/dri/card2" ,O_RDWR | O_CLOEXEC);
+ if(fd < 0){
+ perror("Cannot open DRM device");
+ return -1;
+ }
+
+ // Get resources
+ resources = drmModeGetResources(fd);
+ if(!resources){
+ perror("drmModeGetResources failed");
+ close(fd);
+ return -1;
+ }
+
+ // Find a connected connector
+ for(int i = 0; i < resources->count_connectors; i++){
+ connector = drmModeGetConnector(fd ,resources->connectors[i]);
+ if(connector->connection == DRM_MODE_CONNECTED){
+ break;
+ }
+ drmModeFreeConnector(connector);
+ }
+
+ if(!connector || connector->connection != DRM_MODE_CONNECTED){
+ printf("No connected connector found\n");
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Get encoder and CRTC
+ encoder = drmModeGetEncoder(fd ,connector->encoder_id);
+ if(!encoder){
+ perror("drmModeGetEncoder failed");
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ crtc = drmModeGetCrtc(fd ,encoder->crtc_id);
+ if(!crtc){
+ perror("drmModeGetCrtc failed");
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Call transform_frame_stream with identity transform
+ transform_frame_stream(identity_transform ,NULL);
+
+ // Clean up
+ drmModeFreeCrtc(crtc);
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+
+ return 0;
+}
--- /dev/null
+// gcc -I/usr/include/libdrm drm_info.c -o drm_info -ldrm
+// ./drm_info
+
+
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+
+int transform_frame_stream(){
+ printf("Framebuffer ID: %d\n", crtc->buffer_id);
+ printf("Resolution: %dx%d\n", crtc->width, crtc->height);
+}
+
+// no argument parsing for this first version.
+int main(int argc ,char **arc ,char **envp){
+
+ int fd;
+ drmModeRes *resources;
+ drmModeConnector *connector = NULL;
+ drmModeEncoder *encoder = NULL;
+ drmModeCrtc *crtc = NULL;
+
+ // Open the DRM device
+ fd = open("/dev/dri/card2", O_RDWR | O_CLOEXEC);
+ if (fd < 0) {
+ perror("Cannot open DRM device");
+ return -1;
+ }
+
+ // Get resources
+ resources = drmModeGetResources(fd);
+ if (!resources) {
+ perror("drmModeGetResources failed");
+ close(fd);
+ return -1;
+ }
+
+ // Find a connected connector
+ for (int i = 0; i < resources->count_connectors; i++) {
+ connector = drmModeGetConnector(fd, resources->connectors[i]);
+ if (connector->connection == DRM_MODE_CONNECTED) {
+ break;
+ }
+ drmModeFreeConnector(connector);
+ }
+
+ if (!connector || connector->connection != DRM_MODE_CONNECTED) {
+ printf("No connected connector found\n");
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Get encoder and CRTC
+ encoder = drmModeGetEncoder(fd, connector->encoder_id);
+ if (!encoder) {
+ perror("drmModeGetEncoder failed");
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ crtc = drmModeGetCrtc(fd, encoder->crtc_id);
+ if (!crtc) {
+ perror("drmModeGetCrtc failed");
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ int error;
+ error = transform_frame_stream(crtc->buffer);
+
+ // Clean up
+ drmModeFreeCrtc(crtc);
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+
+ return error;
+}
--- /dev/null
+// gcc -I/usr/include/libdrm drm_info.c -o drm_info -ldrm
+// ./drm_info
+
+
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+
+int transform_frame_stream(){
+ printf("Framebuffer ID: %d\n", crtc->buffer_id);
+ printf("Resolution: %dx%d\n", crtc->width, crtc->height);
+}
+
+// no argument parsing for this first version.
+int main(int argc ,char **arc ,char **envp){
+
+ int fd;
+ drmModeRes *resources;
+ drmModeConnector *connector = NULL;
+ drmModeEncoder *encoder = NULL;
+ drmModeCrtc *crtc = NULL;
+
+ // Open the DRM device
+ fd = open("/dev/dri/card2", O_RDWR | O_CLOEXEC);
+ if (fd < 0) {
+ perror("Cannot open DRM device");
+ return -1;
+ }
+
+ // Get resources
+ resources = drmModeGetResources(fd);
+ if (!resources) {
+ perror("drmModeGetResources failed");
+ close(fd);
+ return -1;
+ }
+
+ // Find a connected connector
+ for (int i = 0; i < resources->count_connectors; i++) {
+ connector = drmModeGetConnector(fd, resources->connectors[i]);
+ if (connector->connection == DRM_MODE_CONNECTED) {
+ break;
+ }
+ drmModeFreeConnector(connector);
+ }
+
+ if (!connector || connector->connection != DRM_MODE_CONNECTED) {
+ printf("No connected connector found\n");
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Get encoder and CRTC
+ encoder = drmModeGetEncoder(fd, connector->encoder_id);
+ if (!encoder) {
+ perror("drmModeGetEncoder failed");
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ crtc = drmModeGetCrtc(fd, encoder->crtc_id);
+ if (!crtc) {
+ perror("drmModeGetCrtc failed");
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ int error;
+ error = transform_frame_stream(crtc->buffer);
+
+ // Clean up
+ drmModeFreeCrtc(crtc);
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+
+ return error;
+}
--- /dev/null
+// gcc -I/usr/include/libdrm drm_info.c -o drm_info -ldrm
+// ./drm_info
+
+
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+int main() {
+ int fd;
+ drmModeRes *resources;
+ drmModeConnector *connector = NULL;
+ drmModeEncoder *encoder = NULL;
+ drmModeCrtc *crtc = NULL;
+
+ // Open the DRM device
+ fd = open("/dev/dri/card2", O_RDWR | O_CLOEXEC);
+ if (fd < 0) {
+ perror("Cannot open DRM device");
+ return -1;
+ }
+
+ // Get resources
+ resources = drmModeGetResources(fd);
+ if (!resources) {
+ perror("drmModeGetResources failed");
+ close(fd);
+ return -1;
+ }
+
+ // Find a connected connector
+ for (int i = 0; i < resources->count_connectors; i++) {
+ connector = drmModeGetConnector(fd, resources->connectors[i]);
+ if (connector->connection == DRM_MODE_CONNECTED) {
+ break;
+ }
+ drmModeFreeConnector(connector);
+ }
+
+ if (!connector || connector->connection != DRM_MODE_CONNECTED) {
+ printf("No connected connector found\n");
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Get encoder and CRTC
+ encoder = drmModeGetEncoder(fd, connector->encoder_id);
+ if (!encoder) {
+ perror("drmModeGetEncoder failed");
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ crtc = drmModeGetCrtc(fd, encoder->crtc_id);
+ if (!crtc) {
+ perror("drmModeGetCrtc failed");
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ printf("Framebuffer ID: %d\n", crtc->buffer_id);
+ printf("Resolution: %dx%d\n", crtc->width, crtc->height);
+
+ // Clean up
+ drmModeFreeCrtc(crtc);
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+
+ return 0;
+}
--- /dev/null
+// gcc -I/usr/include/libdrm drm_info.c -o drm_info -ldrm
+// ./drm_info
+
+
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+int main() {
+ int fd;
+ drmModeRes *resources;
+ drmModeConnector *connector = NULL;
+ drmModeEncoder *encoder = NULL;
+ drmModeCrtc *crtc = NULL;
+
+ // Open the DRM device
+ fd = open("/dev/dri/card2", O_RDWR | O_CLOEXEC);
+ if (fd < 0) {
+ perror("Cannot open DRM device");
+ return -1;
+ }
+
+ // Get resources
+ resources = drmModeGetResources(fd);
+ if (!resources) {
+ perror("drmModeGetResources failed");
+ close(fd);
+ return -1;
+ }
+
+ // Find a connected connector
+ for (int i = 0; i < resources->count_connectors; i++) {
+ connector = drmModeGetConnector(fd, resources->connectors[i]);
+ if (connector->connection == DRM_MODE_CONNECTED) {
+ break;
+ }
+ drmModeFreeConnector(connector);
+ }
+
+ if (!connector || connector->connection != DRM_MODE_CONNECTED) {
+ printf("No connected connector found\n");
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Get encoder and CRTC
+ encoder = drmModeGetEncoder(fd, connector->encoder_id);
+ if (!encoder) {
+ perror("drmModeGetEncoder failed");
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ crtc = drmModeGetCrtc(fd, encoder->crtc_id);
+ if (!crtc) {
+ perror("drmModeGetCrtc failed");
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ printf("Framebuffer ID: %d\n", crtc->buffer_id);
+ printf("Resolution: %dx%d\n", crtc->width, crtc->height);
+
+ // Clean up
+ drmModeFreeCrtc(crtc);
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+
+ return 0;
+}
--- /dev/null
+
+// gcc -I/usr/include/libdrm transform_frame_stream.c -o transform_frame_stream -ldrm
+// ./transform_frame_stream
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <endian.h>
+
+// --------------------------------------------------------------------------------
+// Pixel
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t blue;
+ uint8_t green;
+ uint8_t red;
+ uint8_t alpha;
+ };
+ } PixelRGBA;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t alpha;
+ uint8_t red;
+ uint8_t green;
+ uint8_t blue;
+ };
+ } PixelRGBA;
+#else
+ #warning "Unknown __BYTE_ORDER__ found when packing a PixelRGBA."
+#endif
+
+PixelRGBA black = {.aggregate = 0xff000000};
+PixelRGBA white = {.aggregate = 0xffffffff};
+
+void PixelRGBA_structure(PixelRGBA *px, uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha){
+ px->blue = blue;
+ px->green = green;
+ px->red = red;
+ px->alpha = alpha;
+}
+
+void PixelRGBA_destructure(PixelRGBA *px, uint8_t *red, uint8_t *green, uint8_t *blue, uint8_t *alpha){
+ *blue = px->blue;
+ *green = px->green;
+ *red = px->red;
+ *alpha = px->alpha;
+}
+
+PixelRGBA PixelRGBA_random(){
+ PixelRGBA px;
+ px.aggregate = rand();
+ return px;
+}
+
+// --------------------------------------------------------------------------------
+// Frame
+
+typedef struct{
+ uint32_t width;
+ uint32_t height;
+ PixelRGBA data[];
+} FrameRGBA;
+
+FrameRGBA *FrameRGBA_alloc(int width ,int height){
+ if(width == 0 || height == 0){
+ fprintf(stderr, "FrameRGBA_alloc: Invalid frame dimensions\n");
+ return NULL;
+ }
+
+ FrameRGBA *frame = (FrameRGBA *)malloc(sizeof(FrameRGBA) + width * height * sizeof(PixelRGBA));
+ if(!frame){
+ fprintf(stderr, "Failed to allocate memory for frame\n");
+ return NULL;
+ }
+
+ frame->width = width;
+ frame->height = height;
+
+ // Initialize frame with random pixels for now (could be replaced with real frame data later)
+ for(int i = 0; i < width * height; i++){
+ frame->data[i] = PixelRGBA_random();
+ }
+
+ return frame;
+}
+
+void FrameRGBA_free(FrameRGBA *frame){
+ if(frame){
+ free(frame);
+ }
+}
+
+// --------------------------------------------------------------------------------
+// Identity Transform
+
+void apply_identity_transform(FrameRGBA *frame){
+ // This is an identity transform, so nothing is changed in the frame
+ printf("Applying identity transform to frame\n");
+ // Normally, transformations would modify the frame data here
+}
+
+// --------------------------------------------------------------------------------
+// Main function to grab frames and apply identity transform
+
+int main(){
+ // Simulating grabbing a frame with fixed dimensions for now
+ int width = 640;
+ int height = 480;
+
+ FrameRGBA *frame = FrameRGBA_alloc(width, height);
+ if(!frame){
+ return EXIT_FAILURE;
+ }
+
+ // Apply identity transform (does nothing)
+ apply_identity_transform(frame);
+
+ // Simulate some output (e.g., saving frame, displaying, etc.)
+ printf("Frame processed and passed through identity transform\n");
+
+ // Clean up
+ FrameRGBA_free(frame);
+
+ return EXIT_SUCCESS;
+}
--- /dev/null
+//
+// gcc -I/usr/include/libdrm transform_frame_stream.c -o transform_frame_stream -ldrm
+// ./transform_frame_stream
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <endian.h>
+
+// --------------------------------------------------------------------------------
+// Pixel
+
+// These pixels have hardware support ,and thus must be packed in the order
+// expected by the hardware.
+// 0xAARRGGBB
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t blue;
+ uint8_t green;
+ uint8_t red;
+ uint8_t alpha;
+ };
+ } PixelRGBA;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t alpha;
+ uint8_t red;
+ uint8_t green;
+ uint8_t blue;
+ };
+ } PixelRGBA;
+#else
+ #warning "Unknown __BYTE_ORDER__ found when packing a PixelRGBA."
+#endif
+
+PixelRGBA black = {.aggregate = 0xff000000};
+PixelRGBA white = {.aggregate = 0xffffffff};
+
+void PixelRGBA·structure
+ (
+ PixelRGBA *px
+ ,uint8_t red
+ ,uint8_t green
+ ,uint8_t blue
+ ,uint8_t alpha
+ ){
+ px->blue = blue;
+ px->green = green;
+ px->red = red;
+ px->alpha = alpha;
+}
+void PixelRGBA·destructure
+ (
+ PixelRGBA *px
+ ,uint8_t *red
+ ,uint8_t *green
+ ,uint8_t *blue
+ ,uint8_t *alpha
+ ){
+ *blue = px->blue;
+ *green = px->green;
+ *red = px->red;
+ *alpha = px->alpha;
+}
+
+PixelRGBA PixelRGBA·random(){
+ PixelRGBA px;
+ px.aggregate = rand();
+ return px;
+}
+
+
+
+// --------------------------------------------------------------------------------
+// Frame
+
+typedef struct{
+ uint32_t width;
+ uint32_t height;
+ PixelRGBA data[];
+} FrameRGBA;
+
+FrameRGBA *FrameRGBA·alloc(int width ,int height){
+ bool null_frame = false;
+
+ if( width == 0 ){
+ fprintf(stderr ,"FrameRGBA·alloc:: frame width of zero, so returning a null frame pointer\n");
+ null_frame = true;
+ }
+ if( height == 0 ){
+ fprintf(stderr ,"FrameRGBA·alloc:: frame height of zero, so returning a null frame pointer\n");
+ null_frame = true;
+ }
+ if(null_frame) return NULL;
+
+ size_t size = sizeof(FrameRGBA) + width * height * sizeof(PixelRGBA);
+ FrameRGBA *frame = malloc(size);
+ if(!frame){
+ fprintf(stderr ,"FrameRGBA·alloc::failed to allocate frame\n");
+ return NULL;
+ }
+
+ frame->width = width;
+ frame->height = height;
+ return frame;
+}
+
+FrameRGBA *FrameRGBA·alloc_same(FrameRGBA *frame){
+ if(!frame) return NULL;
+ return FrameRGBA·alloc(frame->width ,frame->height);
+}
+
+void FrameRGBA·dealloc(FrameRGBA *frame){
+ free(frame);
+}
+
+void FrameRGBA·dimensions(FrameRGBA *frame ,uint32_t *width ,uint32_t *height){
+ if(!frame){
+ *width = 0;
+ *height = 0;
+ return;
+ }
+ *width = frame->width;
+ *height = frame->height;
+}
+
+// both frames have already been allocated
+void FrameRGBA·copy(FrameRGBA *from_frame ,FrameRGBA **to_frame_arg){
+ if( to_frame_arg == NULL ) return;
+ if(*to_frame_arg == NULL) return;
+ if( from_frame == NULL ){
+ *to_frame_arg = NULL;
+ return;
+ }
+ FrameRGBA *to_frame = *to_frame_arg;
+
+ uint32_t width ,height;
+ FrameRGBA·dimensions(from_frame ,&width ,&height);
+ if(to_frame->width < width){
+ width = to_frame->width;
+ fprintf(stderr ,"FrameRGBA·copy:: from_frame is wider than to_frame, there will be truncation\n");
+ }else if(to_frame->width > width){
+ fprintf(stderr ,"FrameRGBA·copy:: to_frame is wider, so stale uninitialized pixels will remain at the end of scan lines.\n");
+ }
+ if(to_frame->height < height){
+ height = to_frame->height;
+ fprintf(stderr ,"FrameRGBA·copy:: from_frame is taller than to_frame, there will be truncation\n");
+ }else if(to_frame->height > height){
+ fprintf(stderr ,"FrameRGBA·copy:: to_frame is taller, so stale or uninitialized scan lines will remain at the bottom of the frame.\n");
+ }
+
+ uint32_t j = 0;
+ uint32_t offset = 0;
+ do{
+ memcpy(
+ to_frame->data + offset,
+ from_frame->data + offset,
+ width * sizeof(PixelRGBA)
+ );
+ offset += width;
+ j++;
+ }while(j < height);
+}
+
+// if i and j walk out of frame returns NULL
+PixelRGBA *FrameRGBA·access(FrameRGBA *from_frame ,uint32_t i ,uint32_t j){
+ uint32_t width ,height;
+ FrameRGBA·dimensions(from_frame ,&width ,&height);
+ if(i >= width) return NULL;
+ if(j >= height) return NULL;
+ return &(from_frame->data[j * width + i]);
+}
+
+PixelRGBA FrameRGBA·read(FrameRGBA *from_frame ,uint32_t i ,uint32_t j){
+ return *FrameRGBA·access(from_frame ,i ,j);
+}
+
+void FrameRGBA·write(FrameRGBA *to_frame ,uint32_t i ,uint32_t j ,PixelRGBA px){
+ *FrameRGBA·access(to_frame ,i ,j) = px;
+}
+
+// search frame for condition where f returns a non-null pointer
+// f is handed successive pointers to pixels in the frame.
+// f is given the frame in case it needs context.
+// f is given an argument is it is difficult to curry functions in C.
+void *FrameRGBA·exist
+(
+ FrameRGBA *frame
+ ,void *(*f)(FrameRGBA *frame ,PixelRGBA *px ,void *arg)
+ ,void *arg
+ ){
+
+ if(!frame) return NULL;
+
+ void *item;
+ uint32_t width ,height;
+ FrameRGBA·dimensions(frame ,&width ,&height);
+ uint32_t i = 0;
+ uint32_t j = 0;
+ do{
+ PixelRGBA *px = FrameRGBA·access(frame ,i ,j);
+ if( item=f(frame ,px ,arg) ) return item;
+
+ if( i == width - 1 ){
+ i = 0;
+ j++;
+ }else{
+ i++;
+ }
+ }while(j < height);
+ return NULL;
+}
+
+typedef struct{
+ void (*f)(FrameRGBA *frame ,PixelRGBA *px ,void *arg);
+ void *arg;
+} every_arg_t;
+
+void *every_f(FrameRGBA *frame ,PixelRGBA *px ,void *arg0){
+ every_arg_t *ea = arg0;
+ ea->f(frame ,px ,ea->arg);
+ return NULL;
+}
+void FrameRGBA·every
+(
+ FrameRGBA *frame
+ ,void (*f)(FrameRGBA *frame ,PixelRGBA *px ,void *arg)
+ ,void *arg
+ ){
+ every_arg_t ea = {.f = f ,.arg = arg};
+ FrameRGBA·exist(frame ,every_f ,&ea);
+}
+
+void fill_f(FrameRGBA *to_frame ,PixelRGBA *to_px ,void *arg){
+ PixelRGBA *px = arg;
+ *to_px = *px;
+}
+void FrameRGBA·fill(FrameRGBA *to_frame ,PixelRGBA *fill_px){
+ FrameRGBA·every(to_frame ,fill_f ,fill_px);
+}
+
+void FrameRGBA·fill_black(FrameRGBA *to_frame){
+ FrameRGBA·fill(to_frame ,&black);
+}
+
+void FrameRGBA·fill_white(FrameRGBA *to_frame){
+ FrameRGBA·fill(to_frame ,&white);
+}
+
+void fill_random_f(FrameRGBA *frame ,PixelRGBA *px ,void *arg){
+ *px = PixelRGBA·random();
+}
+void FrameRGBA·fill_random(FrameRGBA *frame){
+ if(!frame) return;
+ FrameRGBA·every(frame ,fill_random_f ,NULL);
+}
+
+
+// --------------------------------------------------------------------------------
+// Transform functions
+// Given the previous frame ,current frame ,and an argument; modifies the
+// current frame.
+
+int identity_transform(FrameRGBA *prev_frame ,FrameRGBA *curr_frame ,void *args){
+ // no processing in the identity transform
+ FrameRGBA·copy(prev_frame ,&curr_frame);
+ return 0; // Success
+}
+
+// --------------------------------------------------------------------------------
+// transform frame stream
+
+int transform_frame_stream(int (*transform)(FrameRGBA * ,FrameRGBA * ,void *) ,void *transform_args){
+ // Simulated screen info (would be fetched from the actual DRM system)
+ FrameRGBA *prev_frame = FrameRGBA·alloc(3840 ,2400);
+ FrameRGBA *curr_frame = FrameRGBA·alloc_same(prev_frame);
+
+ // For now ,we'll simulate grabbing the first frame by filling it with random values.
+ // In the real implementation ,you will fetch the current frame data from the DRM API.
+ uint32_t width ,height;
+ FrameRGBA·dimensions(curr_frame ,&width ,&height);
+ FrameRGBA·fill_random(curr_frame);
+
+ // Call the transform function for the first frame (identity in this case)
+ transform(prev_frame ,curr_frame ,transform_args);
+
+ // Main processing loop (simplified to one iteration for now)
+ while(1){
+ // Simulate grabbing the next frame (we just reuse the current one for this example)
+ // In real code ,you would fetch the next frame from the DRM system here.
+ FrameRGBA·fill_random(curr_frame);
+
+ // Call the transform function for each new frame
+ transform(prev_frame ,curr_frame ,transform_args);
+ FrameRGBA·copy(curr_frame ,&prev_frame);
+
+ break; // Exit after one loop for this example (replace with continuous loop in real implementation)
+ }
+
+ // Clean up memory
+ FrameRGBA·dealloc(prev_frame);
+ FrameRGBA·dealloc(curr_frame);
+
+ return 0; // Success
+}
+
+int main(int argc ,char **argv){
+ int fd;
+ drmModeRes *resources;
+ drmModeConnector *connector = NULL;
+ drmModeEncoder *encoder = NULL;
+ drmModeCrtc *crtc = NULL;
+
+ // Open the DRM device
+ fd = open("/dev/dri/card2",O_RDWR | O_CLOEXEC);
+ if(fd < 0){
+ perror("Cannot open DRM device");
+ return -1;
+ }
+
+ // Get resources
+ resources = drmModeGetResources(fd);
+ if(!resources){
+ perror("drmModeGetResources failed");
+ close(fd);
+ return -1;
+ }
+
+ // Find a connected connector
+ for(int i = 0; i < resources->count_connectors; i++){
+ connector = drmModeGetConnector(fd ,resources->connectors[i]);
+ if(connector->connection == DRM_MODE_CONNECTED){
+ break;
+ }
+ drmModeFreeConnector(connector);
+ }
+
+ if(!connector || connector->connection != DRM_MODE_CONNECTED){
+ printf("No connected connector found\n");
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Get encoder and CRTC
+ encoder = drmModeGetEncoder(fd ,connector->encoder_id);
+ if(!encoder){
+ perror("drmModeGetEncoder failed");
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ crtc = drmModeGetCrtc(fd ,encoder->crtc_id);
+ if(!crtc){
+ perror("drmModeGetCrtc failed");
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Call transform_frame_stream with identity transform
+ transform_frame_stream(identity_transform ,NULL);
+
+ // Clean up
+ drmModeFreeCrtc(crtc);
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+
+ return 0;
+}
--- /dev/null
+//
+// gcc -I/usr/include/libdrm transform_frame_stream.c -o transform_frame_stream -ldrm
+// ./transform_frame_stream
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <endian.h>
+
+// --------------------------------------------------------------------------------
+// Pixel
+
+// These pixels have hardware support ,and thus must be packed in the order
+// expected by the hardware.
+// 0xAARRGGBB
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t blue;
+ uint8_t green;
+ uint8_t red;
+ uint8_t alpha;
+ };
+ } PixelRGBA;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+ typedef union{
+ uint32_t aggregate;
+ struct __attribute__((packed)) {
+ uint8_t alpha;
+ uint8_t red;
+ uint8_t green;
+ uint8_t blue;
+ };
+ } PixelRGBA;
+#else
+ #warning "Unknown __BYTE_ORDER__ found when packing a PixelRGBA."
+#endif
+
+PixelRGBA black = {.aggregate = 0xff000000};
+PixelRGBA white = {.aggregate = 0xffffffff};
+
+void PixelRGBA·structure
+ (
+ PixelRGBA *px
+ ,uint8_t red
+ ,uint8_t green
+ ,uint8_t blue
+ ,uint8_t alpha
+ ){
+ px->blue = blue;
+ px->green = green;
+ px->red = red;
+ px->alpha = alpha;
+}
+void PixelRGBA·destructure
+ (
+ PixelRGBA *px
+ ,uint8_t *red
+ ,uint8_t *green
+ ,uint8_t *blue
+ ,uint8_t *alpha
+ ){
+ *blue = px->blue;
+ *green = px->green;
+ *red = px->red;
+ *alpha = px->alpha;
+}
+
+PixelRGBA PixelRGBA·random(){
+ PixelRGBA px;
+ px.aggregate = rand();
+ return px;
+}
+
+
+
+// --------------------------------------------------------------------------------
+// Frame
+
+typedef struct{
+ uint32_t width;
+ uint32_t height;
+ PixelRGBA data[];
+} FrameRGBA;
+
+FrameRGBA *FrameRGBA·alloc(int width ,int height){
+ bool null_frame = false;
+
+ if( width == 0 ){
+ fprintf(stderr ,"FrameRGBA·alloc:: frame width of zero, so returning a null frame pointer\n");
+ null_frame = true;
+ }
+ if( height == 0 ){
+ fprintf(stderr ,"FrameRGBA·alloc:: frame height of zero, so returning a null frame pointer\n");
+ null_frame = true;
+ }
+ if(null_frame) return NULL;
+
+ size_t size = sizeof(FrameRGBA) + width * height * sizeof(PixelRGBA);
+ FrameRGBA *frame = malloc(size);
+ if(!frame){
+ fprintf(stderr ,"FrameRGBA·alloc::failed to allocate frame\n");
+ return NULL;
+ }
+
+ frame->width = width;
+ frame->height = height;
+ return frame;
+}
+
+FrameRGBA *FrameRGBA·alloc_same(FrameRGBA *frame){
+ if(!frame) return NULL;
+ return FrameRGBA·alloc(frame->width ,frame->height);
+}
+
+void FrameRGBA·dealloc(FrameRGBA *frame){
+ free(frame);
+}
+
+void FrameRGBA·dimensions(FrameRGBA *frame ,uint32_t *width ,uint32_t *height){
+ if(!frame){
+ *width = 0;
+ *height = 0;
+ return;
+ }
+ *width = frame->width;
+ *height = frame->height;
+}
+
+// both frames have already been allocated
+void FrameRGBA·copy(FrameRGBA *from_frame ,FrameRGBA **to_frame_arg){
+ if( to_frame_arg == NULL ) return;
+ if(*to_frame_arg == NULL) return;
+ if( from_frame == NULL ){
+ *to_frame_arg = NULL;
+ return;
+ }
+ FrameRGBA *to_frame = *to_frame_arg;
+
+ uint32_t width ,height;
+ FrameRGBA·dimensions(from_frame ,&width ,&height);
+ if(to_frame->width < width){
+ width = to_frame->width;
+ fprintf(stderr ,"FrameRGBA·copy:: from_frame is wider than to_frame, there will be truncation\n");
+ }else if(to_frame->width > width){
+ fprintf(stderr ,"FrameRGBA·copy:: to_frame is wider, so stale uninitialized pixels will remain at the end of scan lines.\n");
+ }
+ if(to_frame->height < height){
+ height = to_frame->height;
+ fprintf(stderr ,"FrameRGBA·copy:: from_frame is taller than to_frame, there will be truncation\n");
+ }else if(to_frame->height > height){
+ fprintf(stderr ,"FrameRGBA·copy:: to_frame is taller, so stale or uninitialized scan lines will remain at the bottom of the frame.\n");
+ }
+
+ uint32_t j = 0;
+ uint32_t offset = 0;
+ do{
+ memcpy(
+ to_frame->data + offset,
+ from_frame->data + offset,
+ width * sizeof(PixelRGBA)
+ );
+ offset += width;
+ j++;
+ }while(j < height);
+}
+
+// if i and j walk out of frame returns NULL
+PixelRGBA *FrameRGBA·access(FrameRGBA *from_frame ,uint32_t i ,uint32_t j){
+ uint32_t width ,height;
+ FrameRGBA·dimensions(from_frame ,&width ,&height);
+ if(i >= width) return NULL;
+ if(j >= height) return NULL;
+ return &(from_frame->data[j * width + i]);
+}
+
+PixelRGBA FrameRGBA·read(FrameRGBA *from_frame ,uint32_t i ,uint32_t j){
+ return *FrameRGBA·access(from_frame ,i ,j);
+}
+
+void FrameRGBA·write(FrameRGBA *to_frame ,uint32_t i ,uint32_t j ,PixelRGBA px){
+ *FrameRGBA·access(to_frame ,i ,j) = px;
+}
+
+// search frame for condition where f returns a non-null pointer
+// f is handed successive pointers to pixels in the frame.
+// f is given the frame in case it needs context.
+// f is given an argument is it is difficult to curry functions in C.
+void *FrameRGBA·exist
+(
+ FrameRGBA *frame
+ ,void *(*f)(FrameRGBA *frame ,PixelRGBA *px ,void *arg)
+ ,void *arg
+ ){
+
+ if(!frame) return NULL;
+
+ void *item;
+ uint32_t width ,height;
+ FrameRGBA·dimensions(frame ,&width ,&height);
+ uint32_t i = 0;
+ uint32_t j = 0;
+ do{
+ PixelRGBA *px = FrameRGBA·access(frame ,i ,j);
+ if( item=f(frame ,px ,arg) ) return item;
+
+ if( i == width - 1 ){
+ i = 0;
+ j++;
+ }else{
+ i++;
+ }
+ }while(j < height);
+ return NULL;
+}
+
+typedef struct{
+ void (*f)(FrameRGBA *frame ,PixelRGBA *px ,void *arg);
+ void *arg;
+} every_arg_t;
+
+void *every_f(FrameRGBA *frame ,PixelRGBA *px ,void *arg0){
+ every_arg_t *ea = arg0;
+ ea->f(frame ,px ,ea->arg);
+ return NULL;
+}
+void FrameRGBA·every
+(
+ FrameRGBA *frame
+ ,void (*f)(FrameRGBA *frame ,PixelRGBA *px ,void *arg)
+ ,void *arg
+ ){
+ every_arg_t ea = {.f = f ,.arg = arg};
+ FrameRGBA·exist(frame ,every_f ,&ea);
+}
+
+void fill_f(FrameRGBA *to_frame ,PixelRGBA *to_px ,void *arg){
+ PixelRGBA *px = arg;
+ *to_px = *px;
+}
+void FrameRGBA·fill(FrameRGBA *to_frame ,PixelRGBA *fill_px){
+ FrameRGBA·every(to_frame ,fill_f ,fill_px);
+}
+
+void FrameRGBA·fill_black(FrameRGBA *to_frame){
+ FrameRGBA·fill(to_frame ,&black);
+}
+
+void FrameRGBA·fill_white(FrameRGBA *to_frame){
+ FrameRGBA·fill(to_frame ,&white);
+}
+
+void fill_random_f(FrameRGBA *frame ,PixelRGBA *px ,void *arg){
+ *px = PixelRGBA·random();
+}
+void FrameRGBA·fill_random(FrameRGBA *frame){
+ if(!frame) return;
+ FrameRGBA·every(frame ,fill_random_f ,NULL);
+}
+
+
+// --------------------------------------------------------------------------------
+// Transform functions
+// Given the previous frame ,current frame ,and an argument; modifies the
+// current frame.
+
+int identity_transform(FrameRGBA *prev_frame ,FrameRGBA *curr_frame ,void *args){
+ // no processing in the identity transform
+ FrameRGBA·copy(prev_frame ,&curr_frame);
+ return 0; // Success
+}
+
+// --------------------------------------------------------------------------------
+// transform frame stream
+
+int transform_frame_stream(int (*transform)(FrameRGBA * ,FrameRGBA * ,void *) ,void *transform_args){
+ // Simulated screen info (would be fetched from the actual DRM system)
+ FrameRGBA *prev_frame = FrameRGBA·alloc(3840 ,2400);
+ FrameRGBA *curr_frame = FrameRGBA·alloc_same(prev_frame);
+
+ // For now ,we'll simulate grabbing the first frame by filling it with random values.
+ // In the real implementation ,you will fetch the current frame data from the DRM API.
+ uint32_t width ,height;
+ FrameRGBA·dimensions(curr_frame ,&width ,&height);
+ FrameRGBA·fill_random(curr_frame);
+
+ // Call the transform function for the first frame (identity in this case)
+ transform(prev_frame ,curr_frame ,transform_args);
+
+ // Main processing loop (simplified to one iteration for now)
+ while(1){
+ // Simulate grabbing the next frame (we just reuse the current one for this example)
+ // In real code ,you would fetch the next frame from the DRM system here.
+ FrameRGBA·fill_random(curr_frame);
+
+ // Call the transform function for each new frame
+ transform(prev_frame ,curr_frame ,transform_args);
+ FrameRGBA·copy(curr_frame ,&prev_frame);
+
+ break; // Exit after one loop for this example (replace with continuous loop in real implementation)
+ }
+
+ // Clean up memory
+ FrameRGBA·dealloc(prev_frame);
+ FrameRGBA·dealloc(curr_frame);
+
+ return 0; // Success
+}
+
+int main(int argc ,char **argv){
+ int fd;
+ drmModeRes *resources;
+ drmModeConnector *connector = NULL;
+ drmModeEncoder *encoder = NULL;
+ drmModeCrtc *crtc = NULL;
+
+ // Open the DRM device
+ fd = open("/dev/dri/card2",O_RDWR | O_CLOEXEC);
+ if(fd < 0){
+ perror("Cannot open DRM device");
+ return -1;
+ }
+
+ // Get resources
+ resources = drmModeGetResources(fd);
+ if(!resources){
+ perror("drmModeGetResources failed");
+ close(fd);
+ return -1;
+ }
+
+ // Find a connected connector
+ for(int i = 0; i < resources->count_connectors; i++){
+ connector = drmModeGetConnector(fd ,resources->connectors[i]);
+ if(connector->connection == DRM_MODE_CONNECTED){
+ break;
+ }
+ drmModeFreeConnector(connector);
+ }
+
+ if(!connector || connector->connection != DRM_MODE_CONNECTED){
+ printf("No connected connector found\n");
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Get encoder and CRTC
+ encoder = drmModeGetEncoder(fd ,connector->encoder_id);
+ if(!encoder){
+ perror("drmModeGetEncoder failed");
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ crtc = drmModeGetCrtc(fd ,encoder->crtc_id);
+ if(!crtc){
+ perror("drmModeGetCrtc failed");
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+ return -1;
+ }
+
+ // Call transform_frame_stream with identity transform
+ transform_frame_stream(identity_transform ,NULL);
+
+ // Clean up
+ drmModeFreeCrtc(crtc);
+ drmModeFreeEncoder(encoder);
+ drmModeFreeConnector(connector);
+ drmModeFreeResources(resources);
+ close(fd);
+
+ return 0;
+}
projects / noflash / commitdiff