genesys: Add unit test for genesys_fill_segmented_buffer()

backend/genesys.cc

@@ -3452,8 +3452,7 @@ static void genesys_fill_line_interp_buffer(Genesys_Device* dev, uint8_t* work_b
  * back to back and must be interleaved to get usable by the other stages
  * of the backend
  */
-static void genesys_fill_segmented_buffer(Genesys_Device* dev, uint8_t* work_buffer_dst,
-                                          size_t size)
+void genesys_fill_segmented_buffer(Genesys_Device* dev, uint8_t* work_buffer_dst, size_t size)
 {
     DBG_HELPER(dbg);
 

backend/genesys_device.h

@@ -292,7 +292,7 @@ struct Genesys_Device
     // total bytes read to be sent to frontend
     size_t total_bytes_to_read = 0;
 
-    // The current byte during desegmentation process
+    // The current byte in line during desegmentation process
     size_t deseg_curr_byte = 0;
 
     // contains the real used values

backend/genesys_low.h

@@ -636,6 +636,8 @@ extern void sanei_genesys_generate_gamma_buffer(Genesys_Device* dev,
 
 void compute_session(Genesys_Device* dev, ScanSession& s, const Genesys_Sensor& sensor);
 
+void genesys_fill_segmented_buffer(Genesys_Device* dev, uint8_t* work_buffer_dst, size_t size);
+
 const SensorProfile& get_sensor_profile(AsicType asic_type, const Genesys_Sensor& sensor,
                                         unsigned dpi, unsigned ccd_size_divisor);
 

testsuite/backend/genesys/Makefile.am

@@ -20,6 +20,7 @@ AM_CPPFLAGS += -I. -I$(srcdir) -I$(top_builddir)/include -I$(top_srcdir)/include
     -DBACKEND_NAME=genesys
 
 genesys_tests_SOURCES = tests.cc tests.h minigtest.cc minigtest.h \
-    tests_calibration.cc
+    tests_calibration.cc \
+    tests_sensor.cc
 
 genesys_tests_LDADD = $(TEST_LDADD)

testsuite/backend/genesys/tests.cc

@@ -28,5 +28,6 @@
 int main()
 {
     test_calibration_parsing();
+    test_sensor();
     return finish_tests();
 }

testsuite/backend/genesys/tests.h

@@ -24,5 +24,6 @@
 #define SANE_TESTSUITE_BACKEND_GENESYS_GENESYS_UNIT_TEST_H
 
 void test_calibration_parsing();
+void test_sensor();
 
 #endif

testsuite/backend/genesys/tests_sensor.cc

@@ -0,0 +1,95 @@
+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+   This file is part of the SANE package.
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+*/
+
+#define DEBUG_DECLARE_ONLY
+
+#include "tests.h"
+#include "minigtest.h"
+
+#include "../../../backend/genesys_low.h"
+
+#include <numeric>
+
+template<class T>
+std::ostream& operator<<(std::ostream& str, const std::vector<T>& arg)
+{
+    str << "{ ";
+    for (const auto& el : arg) {
+        str << (unsigned) el << ", ";
+    }
+    str << "}\n";
+    return str;
+}
+
+void test_fill_segmented_buffer_depth8()
+{
+    Genesys_Device dev;
+    dev.settings.scan_mode = ScanColorMode::COLOR_SINGLE_PASS;
+    dev.settings.dynamic_lineart = false;
+    dev.settings.depth = 8;
+
+    // 2 lines, 4 segments, 5 bytes each
+    dev.deseg_curr_byte = 0;
+    dev.session.output_segment_start_offset = 0;
+    dev.session.output_segment_pixel_group_count = 5;
+    dev.session.segment_count = 4;
+    dev.session.conseq_pixel_dist_bytes = 5;
+    dev.session.output_line_bytes_raw = 20;
+    dev.segment_order = { 0, 2, 1, 3 };
+
+    dev.oe_buffer.alloc(1024);
+    uint8_t* data = dev.oe_buffer.get_write_pos(40);
+    std::array<uint8_t, 41> input_data = { {
+         1,  5,  9, 13, 17,
+         3,  7, 11, 15, 19,
+         2,  6, 10, 14, 18,
+         4,  8, 12, 16, 20,
+        21, 25, 29, 33, 37,
+        23, 27, 31, 35, 39,
+        22, 26, 30, 34, 38,
+        24, 28, 32, 36, 40,
+        0 // one extra byte so that we don't attempt to refill the buffer
+    } };
+    std::copy(input_data.begin(), input_data.end(), data);
+    dev.oe_buffer.produce(41);
+
+    std::vector<uint8_t> out_data;
+    out_data.resize(40, 0);
+
+    genesys_fill_segmented_buffer(&dev, out_data.data(), 16);
+    ASSERT_EQ(dev.deseg_curr_byte, 4u);
+    genesys_fill_segmented_buffer(&dev, out_data.data() + 16, 4);
+    ASSERT_EQ(dev.deseg_curr_byte, 0u);
+    genesys_fill_segmented_buffer(&dev, out_data.data() + 20, 20);
+    ASSERT_EQ(dev.deseg_curr_byte, 0u);
+
+    std::vector<uint8_t> expected;
+    expected.resize(40, 0);
+    std::iota(expected.begin(), expected.end(), 1); // will fill with 1, 2, 3, ..., 40
+
+    ASSERT_EQ(out_data, expected);
+}
+
+void test_sensor()
+{
+    test_fill_segmented_buffer_depth8();
+}