Implement refresh mode switching and full refresh request from apps (#31)

Author: asivery

shim/README.MD

@@ -42,3 +42,4 @@ Inspired by [ddvk's awesome remarkable2-framebuffer](https://github.com/ddvk/rem
 
     Default: UI
 - QTFB_SHIM_RESPECT_APP_REFRESH_MODES: Whether or not to let the application change the refresh mode (Default: true)
+- QTFB_SHIM_RESPECT_FULL_REFRESH_REQUESTS: Whether or not to perform full refreshes when the application requests them (Default: false)

shim/src/fb-shim.cpp

@@ -39,6 +39,7 @@ struct _32_bit_fb_fix_screeninfo {
 #endif
 
 bool respectAppRefreshMode;
+bool respectFullRefreshRequests;
 
 int fbShimOpen(const char *file) {
     return strcmp(file, FILE_FB) == 0 ? shmFD : INTERNAL_SHIM_NOT_APPLICABLE; 
@@ -50,8 +51,19 @@ int fbShimClose(int fd) {
 
 int translateWaveformMode(int waveformMode) {
     switch(waveformMode) {
+        // GC16 refresh mode
         case 0x02:
             return REFRESH_MODE_CONTENT;
+        // GL16 refresh mode
+        case 0x03:
+            return REFRESH_MODE_UI;
+        // DU refresh mode
+        case 0x01:
+            return REFRESH_MODE_FAST;
+        // A2 refresh mode
+        case 0x04:
+            return REFRESH_MODE_ANIMATE;
+        // Fallback to UI mode for unsupported modes
         default:
             return REFRESH_MODE_UI;
     }
@@ -75,6 +87,10 @@ int fbShimIoctl(int fd, unsigned long request, char *ptr) {
                 update->update_region.height
             );
 
+            if(update->update_mode == UPDATE_MODE_FULL && respectFullRefreshRequests) {
+                clientConnection->requestFullRefresh();
+            }
+
             return 0;
         } else if (request == MXCFB_SET_AUTO_UPDATE_MODE) {
             return 0;

shim/src/fb-shim.h

@@ -1,6 +1,7 @@
 #pragma once
 
 extern bool respectAppRefreshMode;
+extern bool respectFullRefreshRequests;
 
 int fbShimOpen(const char *file);
 int fbShimClose(int fd);

shim/src/shim.cpp

@@ -103,6 +103,7 @@ void __attribute__((constructor)) __construct () {
     shimInput = readEnvvarBoolean("QTFB_SHIM_INPUT", true);
     shimFramebuffer = readEnvvarBoolean("QTFB_SHIM_FB", true);
     respectAppRefreshMode = readEnvvarBoolean("QTFB_SHIM_RESPECT_APP_REFRESH_MODES", true);
+    respectFullRefreshRequests = readEnvvarBoolean("QTFB_SHIM_RESPECT_FULL_REFRESH_REQUESTS", false);
 
     identDigitizer = new std::set<fileident_t>();
     identTouchScreen = new std::set<fileident_t>();