Add possibility to save QR code in PNG file format

Makefile

@@ -60,7 +60,7 @@ all: $(BUILD_DIR)/toxic
 
 $(BUILD_DIR)/toxic: $(OBJ)
 	@echo "  LD    $(@:$(BUILD_DIR)/%=%)"
-	@$(CC) $(CFLAGS) -o $(BUILD_DIR)/toxic $(OBJ) $(LDFLAGS)
+	$(CC) $(CFLAGS) -o $(BUILD_DIR)/toxic $(OBJ) $(LDFLAGS)
 
 $(BUILD_DIR)/osx_video.o: $(SRC_DIR)/$(OSX_VIDEO)
 	@echo "  CC    $(@:$(BUILD_DIR)/)osx_video.o"

cfg/checks/check_features.mk

@@ -34,6 +34,12 @@ ifneq ($(DESK_NOTIFY), disabled)
     -include $(CHECKS_DIR)/desktop_notifications.mk
 endif
 
+# Check if we want build QR exported as PNG support
+QR_PNG = $(shell if [ -z "$(DISABLE_QRPNG)" ] || [ "$(DISABLE_QRPNG)" = "0" ] ; then echo enabled ; else echo disabled ; fi)
+ifneq ($(QR_PNG), disabled)
+    -include $(CHECKS_DIR)/qr_png.mk
+endif
+
 # Check if we can build Toxic
 CHECK_LIBS = $(shell $(PKG_CONFIG) --exists $(LIBS) || echo -n "error")
 ifneq ($(CHECK_LIBS), error)

cfg/checks/qr_png.mk

@@ -0,0 +1,15 @@
+# Variables for QR exported as PNG support
+PNG_LIBS = libpng
+PNG_CFLAGS = -DQRPNG
+
+# Check if we can build QR exported as PNG support
+CHECK_PNG_LIBS = $(shell pkg-config --exists $(PNG_LIBS) || echo -n "error")
+ifneq ($(CHECK_PNG_LIBS), error)
+    LIBS += $(PNG_LIBS)
+    CFLAGS += $(PNG_CFLAGS)
+else ifneq ($(MAKECMDGOALS), clean)
+    MISSING_PNG_LIBS = $(shell for lib in $(PNG_LIBS) ; do if ! $(PKG_CONFIG) --exists $$lib ; then echo $$lib ; fi ; done)
+    $(warning WARNING -- Toxic will be compiled without QR exported as PNG support)
+    $(warning WARNING -- You need these libraries for QR exported as PNG support)
+    $(warning WARNING -- $(MISSING_PNG_LIBS))
+endif

cfg/targets/help.mk

@@ -14,6 +14,7 @@ help:
 	@echo "  DISABLE_AV:             Set to \"1\" to force building without audio call support"
 	@echo "  DISABLE_SOUND_NOTIFY:   Set to \"1\" to force building without sound notification support"
 	@echo "  DISABLE_DESKTOP_NOTIFY: Set to \"1\" to force building without desktop notifications support"
+	@echo "  DISABLE_QRPNG:          Set to \"1\" to force building without QR exported as PNG support"
 	@echo "  USER_CFLAGS:            Add custom flags to default CFLAGS"
 	@echo "  USER_LDFLAGS:           Add custom flags to default LDFLAGS"
 	@echo "  PREFIX:                 Specify a prefix directory for binaries, data files,... (default is \"$(abspath $(PREFIX))\")"

src/global_commands.c

@@ -452,25 +452,42 @@ void cmd_myqr(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MA
     char dir[data_file_len + 1];
     size_t dir_len = get_base_dir(DATA_FILE, data_file_len, dir);
 
+#ifdef QRPNG
+
+    if (argc == 0) {
+        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Required 'txt' or 'png'");
+        return;
+    } else if (!strcmp(argv[1], "txt")) {
+
+#endif /* QRPNG */
         char qr_path[dir_len + nick_len + strlen(QRCODE_FILENAME_EXT) + 1];
         snprintf(qr_path, sizeof(qr_path), "%s%s%s", dir, nick, QRCODE_FILENAME_EXT);
 
-    FILE *output = fopen(qr_path, "wb");
-
-    if (output == NULL) {
-        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Failed to create QR code.");
-        return;
-    }
-
-    if (ID_to_QRcode(id_string, output) == -1) {
-        fclose(output);
+        if (ID_to_QRcode_txt(id_string, qr_path) == -1) {
             line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Failed to create QR code.");
             return;
         }
 
         line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "QR code has been printed to the file '%s'", qr_path);
 
-    fclose(output);
+#ifdef QRPNG
+    } else if (!strcmp(argv[1], "png")) {
+        char qr_path[dir_len + nick_len + strlen(QRCODE_FILENAME_EXT_PNG) + 1];
+        snprintf(qr_path, sizeof(qr_path), "%s%s%s", dir, nick, QRCODE_FILENAME_EXT_PNG);
+
+        if (ID_to_QRcode_png(id_string, qr_path) == -1) {
+            line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Failed to create QR code.");
+            return;
+        }
+
+        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "QR code has been printed to the file '%s'", qr_path);
+
+    } else {
+        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Unknown option '%s' -- Required 'txt' or 'png'", argv[1]);
+        return;
+    }
+
+#endif /* QRPNG */
 }
 
 void cmd_nick(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MAX_STR_SIZE])

src/help.c

@@ -158,7 +158,11 @@ static void help_draw_global(ToxWindow *self)
     wprintw(win, "  /log <on> or <off>         : Enable/disable logging\n");
     wprintw(win, "  /group <type>              : Create a group chat where type: text | audio\n");
     wprintw(win, "  /myid                      : Print your Tox ID\n");
+#ifdef QRPNG
+    wprintw(win, "  /myqr <txt> or <png>       : Print your Tox ID's QR code to a file.\n");
+#else
     wprintw(win, "  /myqr                      : Print your Tox ID's QR code to a file.\n");
+#endif /* QRPNG */
     wprintw(win, "  /clear                     : Clear window history\n");
     wprintw(win, "  /close                     : Close the current chat window\n");
     wprintw(win, "  /quit or /exit             : Exit Toxic\n");

src/osx_video.m

@@ -128,7 +128,8 @@ void bgrxtoyuv420(uint8_t *plane_y, uint8_t *plane_u, uint8_t *plane_v, uint8_t
 
 - (instancetype)initWithDeviceNames:
     (char **)device_names AmtDevices:
-(int *)size {
+    (int *)size
+{
     _session = [[AVCaptureSession alloc] init];
 
     NSArray *devices = [AVCaptureDevice devicesWithMediaType: AVMediaTypeVideo];
@@ -151,7 +152,8 @@ strcpy(video_input_name, (char *)[localizedName cStringUsingEncoding: NSUTF8Stri
     return self;
 }
 
-- (void)dealloc {
+- (void)dealloc
+{
     pthread_mutex_destroy(&_frameLock);
     [_session release];
     [_linkerVideo release];
@@ -162,7 +164,8 @@ strcpy(video_input_name, (char *)[localizedName cStringUsingEncoding: NSUTF8Stri
 - (int)openVideoDeviceIndex:
     (uint32_t)device_idx Width:
     (uint16_t *)width Height:
-(uint16_t *)height {
+    (uint16_t *)height
+{
     pthread_mutex_init(&_frameLock, NULL);
     pthread_mutex_lock(&_frameLock);
     _processingQueue = dispatch_queue_create("Toxic processing queue", DISPATCH_QUEUE_SERIAL);
@@ -212,6 +215,7 @@ AVCaptureInput *input = [[AVCaptureDeviceInput alloc] initWithDevice: device err
     } else {
         [_linkerVideo setVideoSettings: @ {(id)kCVPixelBufferPixelFormatTypeKey: @(kCVPixelFormatType_32BGRA)}];
     }
+
     [_session addOutput: _linkerVideo];
     [_session startRunning];
 
@@ -220,7 +224,8 @@ AVCaptureInput *input = [[AVCaptureDeviceInput alloc] initWithDevice: device err
 }
 
 - (void)closeVideoDeviceIndex:
-(uint32_t)device_idx {
+    (uint32_t)device_idx
+{
     NSArray *devices = [AVCaptureDevice devicesWithMediaType: AVMediaTypeVideo];
     AVCaptureDevice *device = [devices objectAtIndex: device_idx];
     NSError *error = NULL;
@@ -234,7 +239,8 @@ AVCaptureInput *input = [[AVCaptureDeviceInput alloc] initWithDevice: device err
 - (void)captureOutput:
     (AVCaptureOutput *)captureOutput didOutputSampleBuffer:
     (CMSampleBufferRef)sampleBuffer fromConnection:
-(AVCaptureConnection *)connection {
+    (AVCaptureConnection *)connection
+{
     pthread_mutex_lock(&_frameLock);
     CVImageBufferRef img = CMSampleBufferGetImageBuffer(sampleBuffer);
 
@@ -248,6 +254,7 @@ AVCaptureInput *input = [[AVCaptureDeviceInput alloc] initWithDevice: device err
         // we're not going to do anything to it, so it's safe to lock it always
         CVPixelBufferLockBaseAddress(_currentFrame, kCVPixelBufferLock_ReadOnly);
     }
+
     pthread_mutex_unlock(&_frameLock);
 }
 
@@ -256,7 +263,8 @@ AVCaptureInput *input = [[AVCaptureDeviceInput alloc] initWithDevice: device err
     (uint8_t *)u V:
     (uint8_t *)v Width:
     (uint16_t *)width Height:
-(uint16_t *)height {
+    (uint16_t *)height
+{
     if (!_currentFrame) {
         return -1;
     }

src/qr_code.c

@@ -28,18 +28,25 @@
 #include "windows.h"
 #include "qr_code.h"
 
+#ifdef QRPNG
+#include <png.h>
+#define INCHES_PER_METER (100.0/2.54)
+#endif /* QRPNG */
+
 #define BORDER_LEN 1
 #define CHAR_1 "\342\226\210"
 #define CHAR_2 "\342\226\204"
 #define CHAR_3 "\342\226\200"
 
-/* Converts a tox ID string into a QRcode and prints it to the given file stream.
+/* Converts a tox ID string into a QRcode and prints it into the given filename.
  *
  * Returns 0 on success.
  * Returns -1 on failure.
  */
-int ID_to_QRcode(const char *tox_id, FILE *fp)
+int ID_to_QRcode_txt(const char *tox_id, const char *outfile)
 {
+    FILE *fp = fopen(outfile, "wb");
+
     if (fp == NULL)
         return -1;
 
@@ -83,7 +90,106 @@ int ID_to_QRcode(const char *tox_id, FILE *fp)
         fprintf(fp, "\n");
     }
 
+    fclose(fp);
     QRcode_free(qr_obj);
 
     return 0;
 }
+
+#ifdef QRPNG
+/* Converts a tox ID string into a QRcode and prints it into the given filename as png.
+ *
+ * Returns 0 on success.
+ * Returns -1 on failure.
+ */
+int ID_to_QRcode_png(const char *tox_id, const char *outfile)
+{
+    static FILE *fp;
+    unsigned char *row, *p;
+    unsigned char black[4] = {0, 0, 0, 255};
+    size_t x, y, xx, yy, real_width;
+    size_t margin = BORDER_LEN;
+    size_t size = 5;
+    size_t dpi = 72;
+    png_structp png_ptr;
+    png_infop info_ptr;
+
+    fp = fopen(outfile, "wb");
+
+    if (fp == NULL)
+        return -1;
+
+    QRcode *qr_obj = QRcode_encodeString(tox_id, 0, QR_ECLEVEL_L, QR_MODE_8, 0);
+
+    if (qr_obj == NULL)
+        return -1;
+
+    real_width = (qr_obj->width + margin * 2) * size;
+    row = malloc(real_width * 4);
+
+    if (row == NULL)
+        return -1;
+
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+
+    if (png_ptr == NULL)
+        return -1;
+
+    info_ptr = png_create_info_struct(png_ptr);
+
+    if (info_ptr == NULL)
+        return -1;
+
+    if (setjmp(png_jmpbuf(png_ptr))) {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        return -1;
+    }
+
+    png_init_io(png_ptr, fp);
+    png_set_IHDR(png_ptr, info_ptr, real_width, real_width, 8,
+                 PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
+                 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+    png_set_pHYs(png_ptr, info_ptr, dpi * INCHES_PER_METER,
+                 dpi * INCHES_PER_METER, PNG_RESOLUTION_METER);
+    png_write_info(png_ptr, info_ptr);
+
+    /* top margin */
+    memset(row, 0xff, real_width * 4);
+
+    for (y = 0; y < margin * size; y++)
+        png_write_row(png_ptr, row);
+
+    /* data */
+    p = qr_obj->data;
+
+    for (y = 0; y < qr_obj->width; y++) {
+        memset(row, 0xff, real_width * 4);
+
+        for (x = 0; x < qr_obj->width; x++) {
+            for (xx = 0; xx < size; xx++)
+                if (*p & 1)
+                    memcpy(&row[((margin + x) * size + xx) * 4], black, 4);
+
+            p++;
+        }
+
+        for (yy = 0; yy < size; yy++)
+            png_write_row(png_ptr, row);
+    }
+
+    /* bottom margin */
+    memset(row, 0xff, real_width * 4);
+
+    for (y = 0; y < margin * size; y++)
+        png_write_row(png_ptr, row);
+
+    png_write_end(png_ptr, info_ptr);
+    png_destroy_write_struct(&png_ptr, &info_ptr);
+
+    fclose(fp);
+    free(row);
+    QRcode_free(qr_obj);
+
+    return 0;
+}
+#endif /* QRPNG */

src/qr_code.h

@@ -25,11 +25,21 @@
 
 #define QRCODE_FILENAME_EXT ".QRcode"
 
-/* Converts a tox ID string into a QRcode and prints it to the given file stream.
+/* Converts a tox ID string into a QRcode and prints it into the given filename.
  *
  * Returns 0 on success.
  * Returns -1 on failure.
  */
-int ID_to_QRcode(const char *tox_id, FILE *fp);
+int ID_to_QRcode_txt(const char *tox_id, const char *outfile);
+
+#ifdef QRPNG
+#define QRCODE_FILENAME_EXT_PNG ".QRcode.png"
+/* Converts a tox ID string into a QRcode and prints it into the given filename as png.
+ *
+ * Returns 0 on success.
+ * Returns -1 on failure.
+ */
+int ID_to_QRcode_png(const char *tox_id, const char *outfile);
+#endif /* QRPNG */
 
 #endif /* QR_CODE */