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/* -*- mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*- */
/* cc-qr-code.c
*
* Copyright 2019 Purism SPC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author(s):
* Mohammed Sadiq <sadiq@sadiqpk.org>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "cc-qr-code"
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "cc-qr-code.h"
#include "qrcodegen.c"
/**
* SECTION: cc-qr_code
* @title: CcQrCode
* @short_description: A Simple QR Code wrapper around libqrencode
* @include: "cc-qr-code.h"
*
* Generate a QR image from a given text.
*/
#define BYTES_PER_R8G8B8 3
struct _CcQrCode
{
GObject parent_instance;
gchar *text;
GdkTexture *texture;
gint size;
};
G_DEFINE_TYPE (CcQrCode, cc_qr_code, G_TYPE_OBJECT)
static void
cc_qr_code_finalize (GObject *object)
{
CcQrCode *self = (CcQrCode *)object;
g_clear_object (&self->texture);
g_clear_pointer (&self->text, g_free);
G_OBJECT_CLASS (cc_qr_code_parent_class)->finalize (object);
}
static void
cc_qr_code_class_init (CcQrCodeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = cc_qr_code_finalize;
}
static void
cc_qr_code_init (CcQrCode *self)
{
}
CcQrCode *
cc_qr_code_new (void)
{
return g_object_new (CC_TYPE_QR_CODE, NULL);
}
gboolean
cc_qr_code_set_text (CcQrCode *self,
const gchar *text)
{
g_return_val_if_fail (CC_IS_QR_CODE (self), FALSE);
g_return_val_if_fail (!text || *text, FALSE);
if (g_strcmp0 (text, self->text) == 0)
return FALSE;
g_clear_object (&self->texture);
g_free (self->text);
self->text = g_strdup (text);
return TRUE;
}
static void
cc_fill_pixel (GByteArray *array,
guint8 value,
int pixel_size)
{
guint i;
for (i = 0; i < pixel_size; i++) {
g_byte_array_append (array, &value, 1); /* R */
g_byte_array_append (array, &value, 1); /* G */
g_byte_array_append (array, &value, 1); /* B */
}
}
GdkPaintable *
cc_qr_code_get_paintable (CcQrCode *self,
gint size)
{
uint8_t qr_code[qrcodegen_BUFFER_LEN_FOR_VERSION (qrcodegen_VERSION_MAX)];
uint8_t temp_buf[qrcodegen_BUFFER_LEN_FOR_VERSION (qrcodegen_VERSION_MAX)];
g_autoptr(GBytes) bytes = NULL;
GByteArray *qr_matrix;
gint pixel_size, qr_size, total_size;
gint column, row, i;
gboolean success = FALSE;
g_return_val_if_fail (CC_IS_QR_CODE (self), NULL);
g_return_val_if_fail (size > 0, NULL);
if (!self->text || !*self->text)
{
g_warn_if_reached ();
cc_qr_code_set_text (self, "invalid text");
}
if (self->texture && self->size == size)
return GDK_PAINTABLE (self->texture);
self->size = size;
success = qrcodegen_encodeText (self->text,
temp_buf,
qr_code,
qrcodegen_Ecc_LOW,
qrcodegen_VERSION_MIN,
qrcodegen_VERSION_MAX,
qrcodegen_Mask_AUTO,
FALSE);
if (!success)
return NULL;
qr_size = qrcodegen_getSize(qr_code);
pixel_size = MAX (1, size / (qr_size));
total_size = qr_size * pixel_size;
qr_matrix = g_byte_array_sized_new (total_size * total_size * pixel_size * BYTES_PER_R8G8B8);
for (column = 0; column < total_size; column++)
{
for (i = 0; i < pixel_size; i++)
{
for (row = 0; row < total_size / pixel_size; row++)
{
if (qrcodegen_getModule (qr_code, column, row))
cc_fill_pixel (qr_matrix, 0x00, pixel_size);
else
cc_fill_pixel (qr_matrix, 0xff, pixel_size);
}
}
}
bytes = g_byte_array_free_to_bytes (qr_matrix);
g_clear_object (&self->texture);
self->texture = gdk_memory_texture_new (total_size,
total_size,
GDK_MEMORY_R8G8B8,
bytes,
total_size * BYTES_PER_R8G8B8);
return GDK_PAINTABLE (self->texture);
}
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