Add support for worksheet background images.

dev/release/fix_example_docs.pl

@@ -39,6 +39,7 @@ my @examples = (
     [ 'defined_name.c',         'Example of how to create defined names' ],
     [ 'outline.c',              'Example of grouping and outlines' ],
     [ 'outline_collapsed.c',    'Example of grouping and collapsed outlines' ],
+    [ 'background.c',           'Example of how to set the background image for a worksheet' ],
     [ 'tab_colors.c',           'Example of how to set worksheet tab colors' ],
     [ 'diagonal_border.c',      'Example of how to set a worksheet cell diagonal border.' ],
     [ 'hide_sheet.c',           'Example of hiding a worksheet' ],

docs/src/examples.dox

@@ -456,7 +456,7 @@ Example of how to generate Excel outlines and grouping.
 <table  width="600">
 <tr>
   <td>@ref outline.c "&lt;&lt; outline.c"</td>
-  <td align="right">@ref tab_colors.c "tab_colors.c &gt;&gt;"</td>
+  <td align="right">@ref background.c "background.c &gt;&gt;"</td>
 </tr>
 </table>
 
@@ -468,11 +468,27 @@ mainly on collapsed outlines.
 
 
 
-@example tab_colors.c
+@example background.c
 
 <table  width="600">
 <tr>
   <td>@ref outline_collapsed.c "&lt;&lt; outline_collapsed.c"</td>
+  <td align="right">@ref tab_colors.c "tab_colors.c &gt;&gt;"</td>
+</tr>
+</table>
+
+Example of how to set the background image for a worksheet.
+
+@image html background.png
+
+
+
+
+@example tab_colors.c
+
+<table  width="600">
+<tr>
+  <td>@ref background.c "&lt;&lt; background.c"</td>
   <td align="right">@ref diagonal_border.c "diagonal_border.c &gt;&gt;"</td>
 </tr>
 </table>

docs/src/examples.txt

@@ -213,6 +213,13 @@ mainly on collapsed outlines.
 
 @image html outline2.png
 
+##############################################################
+@example background.c
+
+Example of how to set the background image for a worksheet.
+
+@image html background.png
+
 ##############################################################
 @example tab_colors.c
 

examples/background.c

@@ -0,0 +1,20 @@
+/*
+ * An example of setting a worksheet background image with libxlsxwriter.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("background.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_set_background(worksheet, "logo.png");
+
+    workbook_close(workbook);
+
+    return 0;
+}

include/xlsxwriter/workbook.h

@@ -287,6 +287,7 @@ typedef struct lxw_workbook {
     struct lxw_chartsheet_names *chartsheet_names;
     struct lxw_image_md5s *image_md5s;
     struct lxw_image_md5s *header_image_md5s;
+    struct lxw_image_md5s *background_md5s;
     struct lxw_charts *charts;
     struct lxw_charts *ordered_charts;
     struct lxw_formats *formats;

include/xlsxwriter/worksheet.h

@@ -1360,6 +1360,7 @@ typedef struct lxw_object_properties {
     double y_dpi;
     lxw_chart *chart;
     uint8_t is_duplicate;
+    uint8_t is_background;
     char *md5;
     char *image_position;
     uint8_t decorative;
@@ -1752,9 +1753,11 @@ typedef struct lxw_worksheet {
     uint8_t has_vml;
     uint8_t has_comments;
     uint8_t has_header_vml;
+    uint8_t has_background_image;
     lxw_rel_tuple *external_vml_comment_link;
     lxw_rel_tuple *external_comment_link;
     lxw_rel_tuple *external_vml_header_link;
+    lxw_rel_tuple *external_background_link;
     char *comment_author;
     char *vml_data_id_str;
     char *vml_header_id_str;
@@ -1784,6 +1787,7 @@ typedef struct lxw_worksheet {
     lxw_object_properties *footer_left_object_props;
     lxw_object_properties *footer_center_object_props;
     lxw_object_properties *footer_right_object_props;
+    lxw_object_properties *background_image;
 
     STAILQ_ENTRY (lxw_worksheet) list_pointers;
 
@@ -3148,6 +3152,70 @@ lxw_error worksheet_insert_image_buffer_opt(lxw_worksheet *worksheet,
                                             size_t image_size,
                                             lxw_image_options *options);
 
+/**
+ * @brief Set the background image for a worksheet.
+ *
+ * @param worksheet Pointer to a lxw_worksheet instance to be updated.
+ * @param filename  The image filename, with path if required.
+ *
+ * @return A #lxw_error code.
+ *
+ * The `%worksheet_set_background()` function can be used to set the
+ * background image for a worksheet:
+ *
+ * @code
+ *      worksheet_set_background(worksheet, "logo.png");
+ * @endcode
+ *
+ * @image html background.png
+ *
+ * The ``set_background()`` method supports all the image formats supported by
+ * `worksheet_insert_image()`.
+ *
+ * Some people use this method to add a watermark background to their
+ * document. However, Microsoft recommends using a header image [to set a
+ * watermark][watermark]. The choice of method depends on whether you want the
+ * watermark to be visible in normal viewing mode or just when the file is
+ * printed. In XlsxWriter you can get the header watermark effect using
+ * `worksheet_set_header()`:
+ *
+ * @code
+ *     lxw_header_footer_options header_options = {.image_center = "watermark.png"};
+ *     worksheet_set_header_opt(worksheet, "&C&G", &header_options);
+ * @endcode
+ *
+ * [watermark]:https://support.microsoft.com/en-us/office/add-a-watermark-in-excel-a372182a-d733-484e-825c-18ddf3edf009
+ *
+ */
+lxw_error worksheet_set_background(lxw_worksheet *worksheet,
+                                   const char *filename);
+
+/**
+ * @brief Set the background image for a worksheet, from a buffer.
+ *
+ * @param worksheet    Pointer to a lxw_worksheet instance to be updated.
+ * @param image_buffer Pointer to an array of bytes that holds the image data.
+ * @param image_size   The size of the array of bytes.
+ *
+ * @return A #lxw_error code.
+ *
+ * This function can be used to insert a background image into a worksheet
+ * from a memory buffer:
+ *
+ * @code
+ *     worksheet_set_background_buffer(worksheet, image_buffer, image_size);
+ * @endcode
+ *
+ * The buffer should be a pointer to an array of unsigned char data with a
+ * specified size.
+ *
+ * See `worksheet_set_background()` for more details.
+ *
+ */
+lxw_error worksheet_set_background_buffer(lxw_worksheet *worksheet,
+                                          const unsigned char *image_buffer,
+                                          size_t image_size);
+
 /**
  * @brief Insert a chart object into a worksheet.
  *
@@ -4845,6 +4913,10 @@ void lxw_worksheet_prepare_header_image(lxw_worksheet *worksheet,
                                         uint32_t image_ref_id,
                                         lxw_object_properties *object_props);
 
+void lxw_worksheet_prepare_background(lxw_worksheet *worksheet,
+                                      uint32_t image_ref_id,
+                                      lxw_object_properties *object_props);
+
 void lxw_worksheet_prepare_chart(lxw_worksheet *worksheet,
                                  uint32_t chart_ref_id, uint32_t drawing_id,
                                  lxw_object_properties *object_props,

src/packager.c

@@ -1132,6 +1132,7 @@ _write_worksheet_rels_file(lxw_packager *self)
             STAILQ_EMPTY(worksheet->external_drawing_links) &&
             !worksheet->external_vml_header_link &&
             !worksheet->external_vml_comment_link &&
+            !worksheet->external_background_link &&
             !worksheet->external_comment_link)
             continue;
 
@@ -1163,6 +1164,11 @@ _write_worksheet_rels_file(lxw_packager *self)
             lxw_add_worksheet_relationship(rels, rel->type, rel->target,
                                            rel->target_mode);
 
+        rel = worksheet->external_background_link;
+        if (rel)
+            lxw_add_worksheet_relationship(rels, rel->type, rel->target,
+                                           rel->target_mode);
+
         rel = worksheet->external_comment_link;
         if (rel)
             lxw_add_worksheet_relationship(rels, rel->type, rel->target,

src/workbook.c

@@ -244,6 +244,20 @@ lxw_workbook_free(lxw_workbook *workbook)
         free(workbook->header_image_md5s);
     }
 
+    if (workbook->background_md5s) {
+        for (image_md5 = RB_MIN(lxw_image_md5s, workbook->background_md5s);
+             image_md5; image_md5 = next_image_md5) {
+
+            next_image_md5 =
+                RB_NEXT(lxw_image_md5s, workbook->image_md5, image_md5);
+            RB_REMOVE(lxw_image_md5s, workbook->background_md5s, image_md5);
+            free(image_md5->md5);
+            free(image_md5);
+        }
+
+        free(workbook->background_md5s);
+    }
+
     lxw_hash_free(workbook->used_xf_formats);
     lxw_hash_free(workbook->used_dxf_formats);
     lxw_sst_free(workbook->sst);
@@ -1001,6 +1015,25 @@ _add_chart_cache_data(lxw_workbook *self)
     }
 }
 
+/*
+ * Store the image types used in the workbook to update the content types.
+ */
+STATIC void
+_store_image_type(lxw_workbook *self, uint8_t image_type)
+{
+    if (image_type == LXW_IMAGE_PNG)
+        self->has_png = LXW_TRUE;
+
+    if (image_type == LXW_IMAGE_JPEG)
+        self->has_jpeg = LXW_TRUE;
+
+    if (image_type == LXW_IMAGE_BMP)
+        self->has_bmp = LXW_TRUE;
+
+    if (image_type == LXW_IMAGE_GIF)
+        self->has_gif = LXW_TRUE;
+}
+
 /*
  * Iterate through the worksheets and set up any chart or image drawings.
  */
@@ -1032,26 +1065,58 @@ _prepare_drawings(lxw_workbook *self)
 
         if (STAILQ_EMPTY(worksheet->image_props)
             && STAILQ_EMPTY(worksheet->chart_data)
-            && !worksheet->has_header_vml) {
+            && !worksheet->has_header_vml && !worksheet->has_background_image) {
             continue;
         }
 
         drawing_id++;
 
+        /* Prepare background images. */
+        if (worksheet->has_background_image) {
+
+            object_props = worksheet->background_image;
+
+            _store_image_type(self, object_props->image_type);
+
+            /* Check for duplicate images and only store the first instance. */
+            if (object_props->md5) {
+                tmp_image_md5.md5 = object_props->md5;
+                found_duplicate_image = RB_FIND(lxw_image_md5s,
+                                                self->background_md5s,
+                                                &tmp_image_md5);
+            }
+
+            if (found_duplicate_image) {
+                ref_id = found_duplicate_image->id;
+                object_props->is_duplicate = LXW_TRUE;
+            }
+            else {
+                image_ref_id++;
+                ref_id = image_ref_id;
+
+#ifndef USE_NO_MD5
+                new_image_md5 = calloc(1, sizeof(lxw_image_md5));
+#endif
+                if (new_image_md5 && object_props->md5) {
+                    new_image_md5->id = ref_id;
+                    new_image_md5->md5 = lxw_strdup(object_props->md5);
+
+                    RB_INSERT(lxw_image_md5s, self->background_md5s,
+                              new_image_md5);
+                }
+            }
+
+            lxw_worksheet_prepare_background(worksheet, ref_id, object_props);
+        }
+
         /* Prepare worksheet images. */
         STAILQ_FOREACH(object_props, worksheet->image_props, list_pointers) {
 
-            if (object_props->image_type == LXW_IMAGE_PNG)
-                self->has_png = LXW_TRUE;
+            /* Ignore background image added above. */
+            if (object_props->is_background)
+                continue;
 
-            if (object_props->image_type == LXW_IMAGE_JPEG)
-                self->has_jpeg = LXW_TRUE;
-
-            if (object_props->image_type == LXW_IMAGE_BMP)
-                self->has_bmp = LXW_TRUE;
-
-            if (object_props->image_type == LXW_IMAGE_GIF)
-                self->has_gif = LXW_TRUE;
+            _store_image_type(self, object_props->image_type);
 
             /* Check for duplicate images and only store the first instance. */
             if (object_props->md5) {
@@ -1102,17 +1167,7 @@ _prepare_drawings(lxw_workbook *self)
             if (!object_props)
                 continue;
 
-            if (object_props->image_type == LXW_IMAGE_PNG)
-                self->has_png = LXW_TRUE;
-
-            if (object_props->image_type == LXW_IMAGE_JPEG)
-                self->has_jpeg = LXW_TRUE;
-
-            if (object_props->image_type == LXW_IMAGE_BMP)
-                self->has_bmp = LXW_TRUE;
-
-            if (object_props->image_type == LXW_IMAGE_GIF)
-                self->has_gif = LXW_TRUE;
+            _store_image_type(self, object_props->image_type);
 
             /* Check for duplicate images and only store the first instance. */
             if (object_props->md5) {
@@ -1730,11 +1785,16 @@ workbook_new_opt(const char *filename, lxw_workbook_options *options)
     GOTO_LABEL_ON_MEM_ERROR(workbook->image_md5s, mem_error);
     RB_INIT(workbook->image_md5s);
 
-    /* Add the image MD5 tree. */
+    /* Add the header image MD5 tree. */
     workbook->header_image_md5s = calloc(1, sizeof(struct lxw_image_md5s));
     GOTO_LABEL_ON_MEM_ERROR(workbook->header_image_md5s, mem_error);
     RB_INIT(workbook->header_image_md5s);
 
+    /* Add the background image MD5 tree. */
+    workbook->background_md5s = calloc(1, sizeof(struct lxw_image_md5s));
+    GOTO_LABEL_ON_MEM_ERROR(workbook->background_md5s, mem_error);
+    RB_INIT(workbook->background_md5s);
+
     /* Add the charts list. */
     workbook->charts = calloc(1, sizeof(struct lxw_charts));
     GOTO_LABEL_ON_MEM_ERROR(workbook->charts, mem_error);

src/worksheet.c

@@ -634,6 +634,7 @@ lxw_worksheet_free(lxw_worksheet *worksheet)
     _free_relationship(worksheet->external_vml_comment_link);
     _free_relationship(worksheet->external_comment_link);
     _free_relationship(worksheet->external_vml_header_link);
+    _free_relationship(worksheet->external_background_link);
 
     if (worksheet->array) {
         for (col = 0; col < LXW_COL_MAX; col++) {
@@ -2858,6 +2859,44 @@ mem_error:
     }
 }
 
+/*
+ * Set up background image.
+ */
+void
+lxw_worksheet_prepare_background(lxw_worksheet *self,
+                                 uint32_t image_ref_id,
+                                 lxw_object_properties *object_props)
+{
+    lxw_rel_tuple *relationship = NULL;
+    char filename[LXW_FILENAME_LENGTH];
+
+    STAILQ_INSERT_TAIL(self->image_props, object_props, list_pointers);
+
+    relationship = calloc(1, sizeof(lxw_rel_tuple));
+    RETURN_VOID_ON_MEM_ERROR(relationship);
+
+    relationship->type = lxw_strdup("/image");
+    GOTO_LABEL_ON_MEM_ERROR(relationship->type, mem_error);
+
+    lxw_snprintf(filename, 32, "../media/image%d.%s", image_ref_id,
+                 object_props->extension);
+
+    relationship->target = lxw_strdup(filename);
+    GOTO_LABEL_ON_MEM_ERROR(relationship->target, mem_error);
+
+    self->external_background_link = relationship;
+
+    return;
+
+mem_error:
+    if (relationship) {
+        free(relationship->type);
+        free(relationship->target);
+        free(relationship->target_mode);
+        free(relationship);
+    }
+}
+
 /*
  * Set up chart/drawings.
  */
@@ -3329,7 +3368,7 @@ _process_jpeg(lxw_object_properties *image_props)
         if (!feof(stream)) {
             fseek_err = fseek(stream, offset, SEEK_CUR);
             if (fseek_err)
-                goto file_error;
+                break;
         }
     }
 
@@ -4720,6 +4759,30 @@ _worksheet_write_legacy_drawing_hf(lxw_worksheet *self)
 
 }
 
+/*
+ * Write the <picture> element.
+ */
+STATIC void
+_worksheet_write_picture(lxw_worksheet *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    char r_id[LXW_MAX_ATTRIBUTE_LENGTH];
+
+    if (!self->has_background_image)
+        return;
+    else
+        self->rel_count++;
+
+    lxw_snprintf(r_id, LXW_ATTR_32, "rId%d", self->rel_count);
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("r:id", r_id);
+
+    lxw_xml_empty_tag(self->file, "picture", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
 /*
  * Write the <drawing> element.
  */
@@ -6709,6 +6772,9 @@ lxw_worksheet_assemble_xml_file(lxw_worksheet *self)
     /* Write the legacyDrawingHF element. */
     _worksheet_write_legacy_drawing_hf(self);
 
+    /* Write the picture element. */
+    _worksheet_write_picture(self);
+
     /* Write the extLst element. */
     _worksheet_write_ext_list(self);
 
@@ -8771,7 +8837,7 @@ worksheet_set_default_row(lxw_worksheet *self, double height,
 }
 
 /*
- * Insert an image into the worksheet.
+ * Insert an image with options into the worksheet.
  */
 lxw_error
 worksheet_insert_image_opt(lxw_worksheet *self,
@@ -8864,6 +8930,9 @@ worksheet_insert_image(lxw_worksheet *self,
     return worksheet_insert_image_opt(self, row_num, col_num, filename, NULL);
 }
 
+/*
+ * Insert an image buffer, with options, into the worksheet.
+ */
 lxw_error
 worksheet_insert_image_buffer_opt(lxw_worksheet *self,
                                   lxw_row_t row_num,
@@ -8955,6 +9024,9 @@ worksheet_insert_image_buffer_opt(lxw_worksheet *self,
     }
 }
 
+/*
+ * Insert an image buffer into the worksheet.
+ */
 lxw_error
 worksheet_insert_image_buffer(lxw_worksheet *self,
                               lxw_row_t row_num,
@@ -8966,6 +9038,129 @@ worksheet_insert_image_buffer(lxw_worksheet *self,
                                              image_buffer, image_size, NULL);
 }
 
+/*
+ * Set an image as a worksheet background.
+ */
+lxw_error
+worksheet_set_background(lxw_worksheet *self, const char *filename)
+{
+    FILE *image_stream;
+    lxw_object_properties *object_props;
+
+    if (!filename) {
+        LXW_WARN("worksheet_set_background(): "
+                 "filename must be specified.");
+        return LXW_ERROR_NULL_PARAMETER_IGNORED;
+    }
+
+    /* Check that the image file exists and can be opened. */
+    image_stream = lxw_fopen(filename, "rb");
+    if (!image_stream) {
+        LXW_WARN_FORMAT1("worksheet_set_background(): "
+                         "file doesn't exist or can't be opened: %s.",
+                         filename);
+        return LXW_ERROR_PARAMETER_VALIDATION;
+    }
+
+    /* Create a new object to hold the image properties. */
+    object_props = calloc(1, sizeof(lxw_object_properties));
+    if (!object_props) {
+        fclose(image_stream);
+        return LXW_ERROR_MEMORY_MALLOC_FAILED;
+    }
+
+    /* Copy other options or set defaults. */
+    object_props->filename = lxw_strdup(filename);
+    object_props->stream = image_stream;
+    object_props->is_background = LXW_TRUE;
+
+    if (_get_image_properties(object_props) == LXW_NO_ERROR) {
+        _free_object_properties(self->background_image);
+        self->background_image = object_props;
+        self->has_background_image = LXW_TRUE;
+        fclose(image_stream);
+        return LXW_NO_ERROR;
+    }
+    else {
+        _free_object_properties(object_props);
+        fclose(image_stream);
+        return LXW_ERROR_IMAGE_DIMENSIONS;
+    }
+}
+
+/*
+ * Set an image buffer as a worksheet background.
+ */
+lxw_error
+worksheet_set_background_buffer(lxw_worksheet *self,
+                                const unsigned char *image_buffer,
+                                size_t image_size)
+{
+    FILE *image_stream;
+    lxw_object_properties *object_props;
+
+    if (!image_size) {
+        LXW_WARN("worksheet_set_background(): " "size must be non-zero.");
+        return LXW_ERROR_NULL_PARAMETER_IGNORED;
+    }
+
+    /* Write the image buffer to a file (preferably in memory) so we can read
+     * the dimensions like an ordinary file. */
+#ifdef USE_FMEMOPEN
+    image_stream = fmemopen(NULL, image_size, "w+b");
+#else
+    image_stream = lxw_tmpfile(self->tmpdir);
+#endif
+
+    if (!image_stream)
+        return LXW_ERROR_CREATING_TMPFILE;
+
+    if (fwrite(image_buffer, 1, image_size, image_stream) != image_size) {
+        fclose(image_stream);
+        return LXW_ERROR_CREATING_TMPFILE;
+    }
+
+    rewind(image_stream);
+
+    /* Create a new object to hold the image properties. */
+    object_props = calloc(1, sizeof(lxw_object_properties));
+    if (!object_props) {
+        fclose(image_stream);
+        return LXW_ERROR_MEMORY_MALLOC_FAILED;
+    }
+
+    /* Store the image data in the properties structure. */
+    object_props->image_buffer = calloc(1, image_size);
+    if (!object_props->image_buffer) {
+        _free_object_properties(object_props);
+        fclose(image_stream);
+        return LXW_ERROR_MEMORY_MALLOC_FAILED;
+    }
+    else {
+        memcpy(object_props->image_buffer, image_buffer, image_size);
+        object_props->image_buffer_size = image_size;
+        object_props->is_image_buffer = LXW_TRUE;
+    }
+
+    /* Copy other options or set defaults. */
+    object_props->filename = lxw_strdup("image_buffer");
+    object_props->stream = image_stream;
+    object_props->is_background = LXW_TRUE;
+
+    if (_get_image_properties(object_props) == LXW_NO_ERROR) {
+        _free_object_properties(self->background_image);
+        self->background_image = object_props;
+        self->has_background_image = LXW_TRUE;
+        fclose(image_stream);
+        return LXW_NO_ERROR;
+    }
+    else {
+        _free_object_properties(object_props);
+        fclose(image_stream);
+        return LXW_ERROR_IMAGE_DIMENSIONS;
+    }
+}
+
 /*
  * Insert an chart into the worksheet.
  */

test/functional/src/test_background01.c

@@ -0,0 +1,20 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_insert_image(worksheet, CELL("E9"), "images/logo.jpg");
+
+    return workbook_close(workbook);
+}

test/functional/src/test_background02.c

@@ -0,0 +1,20 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background02.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_set_background(worksheet, "images/logo.jpg");
+
+    return workbook_close(workbook);
+}

test/functional/src/test_background03.c

@@ -0,0 +1,21 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background03.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_insert_image(worksheet, CELL("E9"), "images/logo.jpg");
+    worksheet_set_background(worksheet, "images/logo.jpg");
+
+    return workbook_close(workbook);
+}

test/functional/src/test_background04.c

@@ -0,0 +1,22 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background04.xlsx");
+    lxw_worksheet *worksheet1 = workbook_add_worksheet(workbook, NULL);
+    lxw_worksheet *worksheet2 = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_set_background(worksheet1, "images/logo.jpg");
+    worksheet_set_background(worksheet2, "images/logo.jpg");
+
+    return workbook_close(workbook);
+}

test/functional/src/test_background05.c

@@ -0,0 +1,22 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background05.xlsx");
+    lxw_worksheet *worksheet1 = workbook_add_worksheet(workbook, NULL);
+    lxw_worksheet *worksheet2 = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_set_background(worksheet1, "images/logo.jpg");
+    worksheet_set_background(worksheet2, "images/red.jpg");
+
+    return workbook_close(workbook);
+}

test/functional/src/test_background06.c

@@ -0,0 +1,24 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background06.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_insert_image(worksheet, CELL("E9"), "images/logo.jpg");
+    worksheet_set_background(worksheet, "images/logo.jpg");
+
+    lxw_header_footer_options header_options = {.image_center = "images/blue.jpg"};
+    worksheet_set_header_opt(worksheet, "&C&G", &header_options);
+
+    return workbook_close(workbook);
+}

test/functional/src/test_background07.c

@@ -0,0 +1,28 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background07.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_insert_image(worksheet, CELL("E9"), "images/logo.jpg");
+    worksheet_set_background(worksheet, "images/logo.jpg");
+
+    lxw_header_footer_options header_options = {.image_center = "images/blue.jpg"};
+    worksheet_set_header_opt(worksheet, "&C&G", &header_options);
+
+    worksheet_write_string(worksheet, CELL("A1"), "Foo" , NULL);
+    worksheet_write_comment(worksheet, CELL("B2"), "Some text");
+    worksheet_set_comments_author(worksheet, "John");
+
+    return workbook_close(workbook);
+}

test/functional/src/test_background52.c

@@ -0,0 +1,368 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+unsigned char image_buffer[] = {
+    0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
+    0x01, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43,
+    0x00, 0x06, 0x04, 0x05, 0x06, 0x05, 0x04, 0x06, 0x06, 0x05, 0x06, 0x07,
+    0x07, 0x06, 0x08, 0x0a, 0x10, 0x0a, 0x0a, 0x09, 0x09, 0x0a, 0x14, 0x0e,
+    0x0f, 0x0c, 0x10, 0x17, 0x14, 0x18, 0x18, 0x17, 0x14, 0x16, 0x16, 0x1a,
+    0x1d, 0x25, 0x1f, 0x1a, 0x1b, 0x23, 0x1c, 0x16, 0x16, 0x20, 0x2c, 0x20,
+    0x23, 0x26, 0x27, 0x29, 0x2a, 0x29, 0x19, 0x1f, 0x2d, 0x30, 0x2d, 0x28,
+    0x30, 0x25, 0x28, 0x29, 0x28, 0xff, 0xdb, 0x00, 0x43, 0x01, 0x07, 0x07,
+    0x07, 0x0a, 0x08, 0x0a, 0x13, 0x0a, 0x0a, 0x13, 0x28, 0x1a, 0x16, 0x1a,
+    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
+    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
+    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
+    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
+    0x28, 0x28, 0xff, 0xc0, 0x00, 0x11, 0x08, 0x00, 0x50, 0x00, 0xc8, 0x03,
+    0x01, 0x22, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01, 0xff, 0xc4, 0x00,
+    0x1c, 0x00, 0x00, 0x02, 0x02, 0x03, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x04, 0x06, 0x02, 0x03,
+    0x07, 0x01, 0x08, 0xff, 0xc4, 0x00, 0x49, 0x10, 0x00, 0x01, 0x03, 0x03,
+    0x01, 0x03, 0x08, 0x07, 0x04, 0x06, 0x05, 0x0d, 0x00, 0x00, 0x00, 0x00,
+    0x01, 0x02, 0x03, 0x04, 0x00, 0x05, 0x11, 0x06, 0x12, 0x21, 0x31, 0x07,
+    0x13, 0x15, 0x41, 0x51, 0x55, 0x94, 0xd1, 0x14, 0x36, 0x61, 0x71, 0x74,
+    0x81, 0xb2, 0x32, 0x91, 0xb1, 0xc1, 0x22, 0x33, 0x34, 0x72, 0xa1, 0xa2,
+    0x16, 0x23, 0x52, 0x73, 0xc2, 0x24, 0x35, 0x42, 0x43, 0x54, 0x62, 0x64,
+    0x65, 0x82, 0x92, 0x93, 0xd2, 0xf0, 0xff, 0xc4, 0x00, 0x1b, 0x01, 0x00,
+    0x02, 0x03, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x04, 0x05, 0x06, 0x02, 0x07, 0xff,
+    0xc4, 0x00, 0x2b, 0x11, 0x00, 0x02, 0x02, 0x01, 0x03, 0x03, 0x03, 0x03,
+    0x04, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
+    0x11, 0x04, 0x12, 0x21, 0x05, 0x13, 0x31, 0x06, 0x41, 0x51, 0x61, 0x81,
+    0xe1, 0x22, 0x71, 0x91, 0xc1, 0x52, 0xa1, 0xd1, 0xff, 0xda, 0x00, 0x0c,
+    0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00, 0xe8, 0x9a,
+    0x7a, 0xc9, 0x6a, 0x55, 0x82, 0xd8, 0xa5, 0x5b, 0x20, 0x95, 0x18, 0xad,
+    0x12, 0x4c, 0x74, 0x64, 0x9d, 0x81, 0xec, 0xa6, 0x1d, 0x07, 0x69, 0xee,
+    0xb8, 0x1e, 0x1d, 0x1e, 0x54, 0x69, 0xcf, 0x57, 0xad, 0x7f, 0x0a, 0xd7,
+    0xd0, 0x29, 0x8d, 0x00, 0x2e, 0xe8, 0x3b, 0x4f, 0x75, 0xc0, 0xf0, 0xe8,
+    0xf2, 0xa3, 0xa0, 0xed, 0x3d, 0xd7, 0x03, 0xc3, 0xa3, 0xca, 0x98, 0xd5,
+    0x2b, 0x94, 0x4b, 0xb4, 0xc8, 0xca, 0x87, 0x6e, 0xb7, 0x2d, 0x4d, 0xbb,
+    0x27, 0xed, 0x29, 0x27, 0x04, 0x8c, 0xe0, 0x00, 0x7a, 0xb7, 0xd4, 0x95,
+    0x56, 0xed, 0x92, 0x8a, 0x23, 0xb6, 0xc5, 0x54, 0x5c, 0x98, 0xfd, 0xfb,
+    0x65, 0x85, 0x8f, 0xd7, 0xc2, 0xb5, 0xb7, 0xfb, 0xed, 0x36, 0x3f, 0x11,
+    0x51, 0x83, 0x7a, 0x58, 0xab, 0x64, 0x22, 0xc8, 0x55, 0xd8, 0x03, 0x59,
+    0xaa, 0x7e, 0xbc, 0xe4, 0xf6, 0x6e, 0x97, 0xb5, 0x31, 0x71, 0x91, 0x39,
+    0xa9, 0x61, 0xc7, 0x03, 0x6e, 0x84, 0xa4, 0x82, 0x85, 0x10, 0x4f, 0x12,
+    0x7f, 0x48, 0x6e, 0xe3, 0xbb, 0xdd, 0x54, 0x23, 0x57, 0xab, 0xd0, 0xc2,
+    0x71, 0xdd, 0x19, 0x64, 0xa5, 0x3d, 0x6c, 0xe1, 0x2d, 0xb2, 0x8e, 0x0e,
+    0xee, 0xcd, 0xaa, 0xc6, 0xf8, 0x25, 0x98, 0x16, 0xd7, 0x00, 0xfe, 0xc3,
+    0x28, 0x3f, 0x80, 0xad, 0x9d, 0x07, 0x69, 0xee, 0xb8, 0x1e, 0x1d, 0x1e,
+    0x55, 0xc1, 0x98, 0x90, 0xf4, 0x67, 0x92, 0xec, 0x77, 0x56, 0xd3, 0xa9,
+    0xde, 0x14, 0x85, 0x60, 0x8a, 0xec, 0xda, 0x0a, 0xf8, 0xed, 0xf2, 0xce,
+    0x57, 0x2b, 0x06, 0x53, 0x0a, 0xe6, 0xdc, 0x50, 0xdd, 0xb5, 0xbb, 0x21,
+    0x58, 0xff, 0x00, 0xee, 0x15, 0x06, 0xa3, 0x48, 0xea, 0x5b, 0x93, 0xca,
+    0x26, 0xa3, 0x54, 0xad, 0x7b, 0x5a, 0xc3, 0x19, 0xf4, 0x1d, 0xa7, 0xba,
+    0xe0, 0x78, 0x74, 0x79, 0x51, 0xd0, 0x76, 0x9e, 0xeb, 0x81, 0xe1, 0xd1,
+    0xe5, 0x4c, 0x68, 0xaa, 0x85, 0xb1, 0x77, 0x41, 0xda, 0x7b, 0xae, 0x07,
+    0x87, 0x47, 0x95, 0x1d, 0x07, 0x69, 0xee, 0xb8, 0x1e, 0x1d, 0x1e, 0x54,
+    0xc6, 0xbc, 0x5a, 0xd2, 0x81, 0x95, 0xa8, 0x24, 0x76, 0x93, 0x8a, 0x00,
+    0x5f, 0xd0, 0x76, 0x9e, 0xeb, 0x81, 0xe1, 0xd1, 0xe5, 0x47, 0x41, 0xda,
+    0x7b, 0xae, 0x07, 0x87, 0x47, 0x95, 0x31, 0x1b, 0xc6, 0xea, 0x32, 0x33,
+    0x8c, 0xef, 0xa0, 0x05, 0xdd, 0x07, 0x69, 0xee, 0xb8, 0x1e, 0x1d, 0x1e,
+    0x54, 0x74, 0x1d, 0xa7, 0xba, 0xe0, 0x78, 0x74, 0x79, 0x53, 0x1a, 0x81,
+    0x7e, 0x96, 0xe4, 0x0b, 0x34, 0xd9, 0x4c, 0x6c, 0x97, 0x5a, 0x68, 0xad,
+    0x3b, 0x43, 0x23, 0x22, 0x80, 0x31, 0xe8, 0x3b, 0x4f, 0x75, 0xc0, 0xf0,
+    0xe8, 0xf2, 0xa8, 0x36, 0xd6, 0x34, 0xf5, 0xc9, 0xe9, 0x4d, 0xc3, 0xb7,
+    0xc2, 0x70, 0xc6, 0x56, 0xc3, 0x87, 0xd1, 0x52, 0x00, 0x3b, 0xf7, 0x6f,
+    0x1e, 0xca, 0x97, 0xa5, 0xa6, 0x3d, 0x3e, 0xc1, 0x0e, 0x54, 0xa5, 0x05,
+    0x3c, 0xea, 0x49, 0x51, 0x03, 0x1d, 0x67, 0xaa, 0xab, 0xfc, 0x9d, 0xfe,
+    0xd9, 0xa8, 0x3e, 0x2b, 0xf3, 0x55, 0x00, 0x58, 0xfa, 0x0e, 0xd3, 0xdd,
+    0x70, 0x3c, 0x3a, 0x3c, 0xa8, 0xe8, 0x3b, 0x4f, 0x75, 0xc0, 0xf0, 0xe8,
+    0xf2, 0xa6, 0x34, 0x50, 0x02, 0xee, 0x83, 0xb4, 0xf7, 0x5c, 0x0f, 0x0e,
+    0x8f, 0x2a, 0x3a, 0x0e, 0xd3, 0xdd, 0x70, 0x3c, 0x3a, 0x3c, 0xa9, 0x82,
+    0x56, 0x95, 0x12, 0x12, 0xa0, 0x48, 0xdc, 0x40, 0x3c, 0x2b, 0xda, 0x00,
+    0x5d, 0xd0, 0x76, 0x9e, 0xeb, 0x81, 0xe1, 0xd1, 0xe5, 0x47, 0x41, 0xda,
+    0x7b, 0xae, 0x07, 0x87, 0x47, 0x95, 0x4f, 0x5b, 0x88, 0x6f, 0x1b, 0x6b,
+    0x4a, 0x73, 0xc3, 0x27, 0x15, 0x95, 0x00, 0x57, 0xb5, 0x0d, 0x92, 0xd4,
+    0x9b, 0x05, 0xcd, 0x49, 0xb6, 0x41, 0x0a, 0x11, 0x5d, 0x20, 0x88, 0xe8,
+    0xc8, 0x3b, 0x07, 0xd9, 0x45, 0x30, 0xd4, 0x7e, 0xaf, 0x5d, 0x3e, 0x15,
+    0xdf, 0xa0, 0xd1, 0x40, 0x06, 0x9c, 0xf5, 0x7a, 0xd7, 0xf0, 0xad, 0x7d,
+    0x02, 0x98, 0xd2, 0xed, 0x39, 0xea, 0xf5, 0xaf, 0xe1, 0x5a, 0xfa, 0x05,
+    0x29, 0xd7, 0x3a, 0x81, 0x76, 0x68, 0x6d, 0xb5, 0x10, 0x8f, 0x4b, 0x7f,
+    0x3b, 0x2a, 0x3b, 0xf6, 0x12, 0x38, 0x9c, 0x7e, 0x15, 0xee, 0xba, 0xe5,
+    0x64, 0x94, 0x23, 0xe5, 0x9e, 0x2c, 0xb2, 0x35, 0xc5, 0xca, 0x5e, 0x0b,
+    0x3d, 0x50, 0xf9, 0x43, 0xb1, 0xdc, 0xae, 0xb7, 0x28, 0xce, 0xdb, 0xe3,
+    0x17, 0x90, 0x86, 0xb6, 0x49, 0x0b, 0x48, 0xc1, 0xda, 0x27, 0xac, 0xd7,
+    0x3f, 0x95, 0x36, 0x54, 0xa7, 0x0a, 0xe4, 0x48, 0x79, 0xd5, 0x93, 0x9c,
+    0xad, 0x64, 0xd4, 0x72, 0xe2, 0xff, 0x00, 0xb6, 0xaf, 0xbe, 0xb5, 0xa9,
+    0xd0, 0xca, 0xa9, 0x6f, 0x52, 0xe7, 0xf6, 0xfc, 0x99, 0x57, 0x6b, 0x63,
+    0x6c, 0x76, 0xb8, 0xf1, 0xfb, 0xfe, 0x0b, 0x95, 0xee, 0x16, 0xb7, 0xbd,
+    0xc6, 0x62, 0x3d, 0xd7, 0xd2, 0x24, 0xb2, 0xc6, 0xf4, 0x25, 0x6e, 0xb7,
+    0xb8, 0xf6, 0x9c, 0x1d, 0xe7, 0x7f, 0x13, 0xbe, 0xaa, 0x97, 0x6b, 0x4c,
+    0xeb, 0x4b, 0x88, 0x45, 0xc1, 0x82, 0xca, 0x9c, 0x1b, 0x49, 0x05, 0x40,
+    0xe4, 0x7c, 0x89, 0xa8, 0xaa, 0x71, 0x7f, 0xdb, 0x57, 0xdf, 0x5a, 0xd4,
+    0xa5, 0x2b, 0xed, 0x12, 0x7d, 0xe6, 0xac, 0xc6, 0x32, 0x8f, 0x1c, 0x63,
+    0xe8, 0xbf, 0x25, 0x69, 0x4a, 0x32, 0xe7, 0x9c, 0xfd, 0x5f, 0xe0, 0xc1,
+    0x55, 0xd3, 0x39, 0x1f, 0xfd, 0x96, 0xe7, 0xfb, 0xe8, 0xfc, 0x0d, 0x73,
+    0x35, 0x57, 0x4b, 0xe4, 0x83, 0xf6, 0x4b, 0x9f, 0xef, 0xa3, 0xf0, 0x35,
+    0x47, 0xaa, 0xdd, 0xd8, 0xd2, 0x4e, 0xdc, 0x67, 0x6a, 0xcf, 0xf0, 0x5b,
+    0xe9, 0xf0, 0xdf, 0xa8, 0x8c, 0x7e, 0x4e, 0x87, 0x45, 0x60, 0x6b, 0x24,
+    0x9c, 0x8a, 0xe4, 0x3a, 0x6f, 0x5b, 0xaf, 0x5d, 0x67, 0x69, 0xc7, 0x6c,
+    0xbd, 0xb9, 0xce, 0x4e, 0x8f, 0x51, 0xa2, 0x95, 0x31, 0xdd, 0x9c, 0xa2,
+    0x25, 0xea, 0x43, 0x91, 0x2c, 0xf3, 0xa4, 0x32, 0x40, 0x75, 0xa6, 0x16,
+    0xe2, 0x09, 0x19, 0xc1, 0x09, 0x24, 0x55, 0x53, 0x4a, 0xd8, 0xa0, 0xde,
+    0xec, 0xcc, 0x5c, 0xaf, 0x09, 0x76, 0x6c, 0xb7, 0xca, 0xf6, 0x94, 0xeb,
+    0xaa, 0xc0, 0xc2, 0x88, 0xc0, 0x00, 0xee, 0x1b, 0xaa, 0xcb, 0xa9, 0x7d,
+    0x5c, 0xba, 0x7c, 0x2b, 0xbf, 0x41, 0xa5, 0x9c, 0x9d, 0x3a, 0xda, 0xf4,
+    0x94, 0x34, 0x21, 0x69, 0x52, 0xd0, 0x56, 0x16, 0x90, 0x72, 0x52, 0x4a,
+    0xd4, 0x77, 0xf6, 0x6e, 0xad, 0xb2, 0x90, 0xaa, 0xdc, 0x55, 0xa6, 0xb5,
+    0xa2, 0x2d, 0x2c, 0xad, 0x66, 0xdb, 0x31, 0x1b, 0x6d, 0xb6, 0xa5, 0x67,
+    0x9b, 0x51, 0xcf, 0x0c, 0xfb, 0x52, 0x47, 0xcc, 0x56, 0xfb, 0x72, 0x94,
+    0x79, 0x51, 0xba, 0x02, 0xa2, 0x42, 0x62, 0x80, 0x01, 0x3c, 0x37, 0x37,
+    0x51, 0x6e, 0x4a, 0x17, 0x4e, 0x52, 0xe0, 0x37, 0x14, 0xed, 0xa6, 0x13,
+    0x60, 0xba, 0xa4, 0xf0, 0x49, 0x04, 0x93, 0xf8, 0x81, 0xef, 0xad, 0xb1,
+    0x9d, 0x44, 0x6e, 0x54, 0xe6, 0xf3, 0xea, 0x08, 0xf4, 0x88, 0xe9, 0x4b,
+    0x64, 0xee, 0xda, 0x3b, 0x28, 0xff, 0x00, 0xd4, 0xd0, 0x03, 0xad, 0x79,
+    0xbb, 0x49, 0x5c, 0x7f, 0x75, 0x3f, 0x58, 0xa5, 0x13, 0xa1, 0x47, 0x97,
+    0xc9, 0xc4, 0x77, 0x24, 0x37, 0xb6, 0xb6, 0x21, 0x87, 0x1b, 0x3b, 0x44,
+    0x6c, 0xab, 0x67, 0x8e, 0xee, 0x3f, 0x3a, 0x69, 0xaf, 0xdc, 0x42, 0x34,
+    0xa4, 0xe4, 0xad, 0x69, 0x4a, 0x96, 0x12, 0x12, 0x09, 0xc1, 0x51, 0xda,
+    0x1b, 0x87, 0x6d, 0x44, 0x20, 0x9e, 0x4c, 0xf0, 0x06, 0x7f, 0xc8, 0x33,
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+    0x4f, 0xa5, 0x05, 0x12, 0x10, 0x33, 0xb3, 0xb3, 0xb3, 0xd4, 0x40, 0xfe,
+    0x14, 0xc1, 0x9b, 0x65, 0xce, 0xcc, 0xc6, 0xa7, 0xba, 0x3c, 0xf4, 0x72,
+    0xec, 0xa8, 0xe5, 0xe4, 0x37, 0x1f, 0x68, 0x04, 0x38, 0x94, 0x2b, 0x78,
+    0xcf, 0x6d, 0x37, 0x5c, 0x57, 0x19, 0xe7, 0x81, 0x2b, 0x24, 0xf9, 0xc7,
+    0x03, 0x49, 0x1a, 0xae, 0xda, 0xd4, 0xb7, 0xa3, 0xb5, 0xe9, 0x52, 0x54,
+    0xc1, 0xc3, 0xca, 0x8d, 0x1d, 0x6e, 0xa5, 0xb3, 0xed, 0x20, 0x52, 0x9e,
+    0x4f, 0x24, 0x35, 0x32, 0xe1, 0xa9, 0x24, 0xc7, 0x5e, 0xdb, 0x2e, 0xcd,
+    0xda, 0x42, 0xb1, 0x8c, 0x8c, 0x1c, 0x71, 0xa9, 0x9c, 0x99, 0xb2, 0xd3,
+    0x3a, 0x32, 0x02, 0x9a, 0xc1, 0x2e, 0xed, 0xb8, 0xb5, 0x75, 0x95, 0x6d,
+    0x10, 0x73, 0xee, 0xc6, 0x3e, 0x55, 0xa3, 0x40, 0xef, 0xb8, 0x6a, 0x83,
+    0xff, 0x00, 0x33, 0x70, 0x7d, 0xc6, 0x9b, 0x4a, 0x2a, 0x49, 0x7b, 0x7f,
+    0xd1, 0x26, 0xdb, 0x8b, 0x7e, 0xe3, 0xed, 0x47, 0xea, 0xf5, 0xd3, 0xe1,
+    0x5d, 0xfa, 0x0d, 0x14, 0x6a, 0x3f, 0x57, 0xae, 0x9f, 0x0a, 0xef, 0xd0,
+    0x68, 0xa8, 0x09, 0xc3, 0x4e, 0x7a, 0xbd, 0x6b, 0xf8, 0x56, 0xbe, 0x81,
+    0x4c, 0x6a, 0xbd, 0xa7, 0xaf, 0x76, 0xa4, 0xd8, 0x2d, 0x89, 0x55, 0xce,
+    0x08, 0x50, 0x8a, 0xd0, 0x20, 0xc8, 0x46, 0x41, 0xd8, 0x1e, 0xda, 0x61,
+    0xd3, 0x96, 0x9e, 0xf4, 0x81, 0xe2, 0x11, 0xe7, 0x40, 0x0c, 0x6b, 0x63,
+    0x4a, 0x03, 0x20, 0xf5, 0xd2, 0xae, 0x9c, 0xb4, 0xf7, 0xa4, 0x0f, 0x10,
+    0x8f, 0x3a, 0x3a, 0x72, 0xd3, 0xde, 0x90, 0x3c, 0x42, 0x3c, 0xea, 0xbe,
+    0xaf, 0x4d, 0x1d, 0x55, 0x4e, 0xa9, 0xf8, 0x64, 0x95, 0x58, 0xeb, 0x92,
+    0x92, 0x1c, 0x9a, 0xc4, 0xd2, 0x91, 0x7e, 0xb5, 0x0e, 0x17, 0x58, 0x3e,
+    0x21, 0x1e, 0x75, 0xef, 0x4f, 0xda, 0xbb, 0xd6, 0x07, 0x88, 0x47, 0x9d,
+    0x72, 0x96, 0x7a, 0x6f, 0x50, 0x9f, 0xe8, 0x92, 0x6b, 0xee, 0xbf, 0xa6,
+    0x69, 0x47, 0xa8, 0x43, 0xdd, 0x32, 0xd5, 0x1a, 0xee, 0x86, 0x6d, 0x6a,
+    0x8c, 0x59, 0x25, 0x7b, 0x25, 0x20, 0xf5, 0x1c, 0xe7, 0x8f, 0xdf, 0x49,
+    0x4d, 0x2e, 0xe9, 0xdb, 0x4f, 0x7a, 0x41, 0xf1, 0x08, 0xf3, 0xaf, 0x3a,
+    0x72, 0xd3, 0xde, 0x90, 0x3c, 0x42, 0x3c, 0xeb, 0x73, 0x45, 0xd3, 0xac,
+    0xaa, 0x51, 0xb2, 0xf9, 0xee, 0x71, 0x58, 0x58, 0x5c, 0x25, 0xfd, 0x94,
+    0xee, 0xd4, 0x46, 0x49, 0xc6, 0x0b, 0x09, 0xf2, 0xc6, 0x34, 0x52, 0xee,
+    0x9c, 0xb4, 0xf7, 0xa4, 0x0f, 0x10, 0x8f, 0x3a, 0x3a, 0x72, 0xd3, 0xde,
+    0x90, 0x3c, 0x42, 0x3c, 0xeb, 0x5c, 0xaa, 0x6a, 0xd5, 0xc7, 0x1a, 0x56,
+    0xf0, 0x7f, 0xe1, 0x1d, 0x1f, 0xc8, 0x6a, 0xb7, 0xa7, 0x2d, 0x57, 0xb7,
+    0xb4, 0xb5, 0xbd, 0x10, 0xef, 0x81, 0x88, 0xcf, 0x47, 0x49, 0xc2, 0xa3,
+    0x05, 0x2d, 0xa0, 0x47, 0x04, 0xa8, 0x11, 0xf2, 0xce, 0xf1, 0xdb, 0x56,
+    0x1b, 0x95, 0xc2, 0xcb, 0x70, 0xb7, 0xc8, 0x86, 0xfd, 0xd6, 0x18, 0x69,
+    0xf6, 0xcb, 0x6a, 0x29, 0x92, 0x80, 0x70, 0x46, 0x37, 0x6f, 0xaf, 0x2d,
+    0x77, 0x0b, 0x35, 0xba, 0xdb, 0x1a, 0x1b, 0x57, 0x68, 0x4a, 0x6d, 0x86,
+    0xd2, 0xda, 0x54, 0xa9, 0x08, 0xc9, 0x00, 0x63, 0x7e, 0xfa, 0x92, 0x33,
+    0xdb, 0x1c, 0x22, 0x37, 0x0c, 0xcb, 0x2c, 0x20, 0xe9, 0xab, 0x7c, 0x5d,
+    0x38, 0xab, 0x28, 0x6c, 0xb9, 0x11, 0x69, 0x21, 0xc2, 0xa3, 0xfa, 0x4b,
+    0x27, 0x8a, 0x89, 0xed, 0xcf, 0xdd, 0x81, 0x4b, 0xc6, 0x9c, 0xba, 0x1b,
+    0x77, 0x45, 0xae, 0xf8, 0x4d, 0xb7, 0x67, 0x9b, 0x38, 0x8e, 0x03, 0xc5,
+    0xbe, 0x1b, 0x1b, 0x79, 0xc7, 0x0d, 0xd9, 0xc5, 0x39, 0xe9, 0xcb, 0x4f,
+    0x7a, 0x40, 0xf1, 0x08, 0xf3, 0xa3, 0xa7, 0x2d, 0x3d, 0xe9, 0x03, 0xc4,
+    0x23, 0xce, 0x92, 0xb2, 0x43, 0xed, 0xc4, 0xde, 0xc5, 0xbe, 0x33, 0x16,
+    0xc4, 0xdb, 0xda, 0x68, 0x26, 0x22, 0x5b, 0xe6, 0x82, 0x3f, 0xdd, 0xc6,
+    0x29, 0x66, 0x8f, 0xd3, 0xcd, 0xe9, 0xbb, 0x5a, 0xa2, 0x21, 0xe2, 0xfa,
+    0xd6, 0xe1, 0x71, 0x6e, 0x14, 0xec, 0xe7, 0x70, 0x00, 0x63, 0xd8, 0x05,
+    0x4c, 0xe9, 0xcb, 0x4f, 0x7a, 0x40, 0xf1, 0x08, 0xf3, 0xa3, 0xa7, 0x2d,
+    0x3d, 0xe9, 0x03, 0xc4, 0x23, 0xce, 0x96, 0xe7, 0x86, 0xbe, 0x47, 0xb5,
+    0x65, 0x32, 0x06, 0x93, 0xd3, 0x2c, 0x69, 0xd5, 0x4f, 0x2c, 0x39, 0xce,
+    0x19, 0x4e, 0xed, 0x8f, 0xd1, 0xc6, 0xc2, 0x01, 0x3b, 0x29, 0xf6, 0xe3,
+    0x27, 0x7d, 0x6b, 0x93, 0xa7, 0x64, 0xb1, 0x78, 0x91, 0x71, 0xb1, 0x4f,
+    0x4c, 0x27, 0x24, 0xe3, 0xd2, 0x19, 0x71, 0x9e, 0x71, 0xb7, 0x08, 0xff,
+    0x00, 0x4b, 0x19, 0x18, 0x34, 0xcf, 0xa7, 0x2d, 0x3d, 0xe9, 0x03, 0xc4,
+    0x23, 0xce, 0x8e, 0x9c, 0xb4, 0xf7, 0xa4, 0x0f, 0x10, 0x8f, 0x3a, 0x7d,
+    0xc9, 0x67, 0x22, 0xed, 0xc7, 0x18, 0x34, 0xb3, 0x6c, 0x98, 0xab, 0x64,
+    0xd8, 0xd3, 0xee, 0x6b, 0x94, 0xf4, 0x96, 0xd4, 0x8e, 0x70, 0xb2, 0x94,
+    0x25, 0xbc, 0x82, 0x3f, 0x45, 0x23, 0xdf, 0xd6, 0x6b, 0x76, 0x9e, 0xb6,
+    0xf4, 0x3d, 0x96, 0x2c, 0x0e, 0x77, 0x9e, 0xe6, 0x13, 0xb3, 0xb7, 0xb3,
+    0xb3, 0xb5, 0xbc, 0x9e, 0x19, 0x3d, 0xb4, 0x74, 0xe5, 0xa7, 0xbd, 0x20,
+    0x78, 0x84, 0x79, 0xd1, 0xd3, 0x96, 0x9e, 0xf4, 0x81, 0xe2, 0x11, 0xe7,
+    0x49, 0xc9, 0xb5, 0x81, 0xa8, 0xa4, 0xf2, 0x2e, 0xb8, 0xe9, 0xe7, 0xfa,
+    0x65, 0x57, 0x5b, 0x2c, 0xe1, 0x06, 0x5b, 0xa8, 0x08, 0x7d, 0x2b, 0x6b,
+    0x9c, 0x6d, 0xe0, 0x38, 0x12, 0x32, 0x30, 0x7d, 0xb4, 0xc2, 0xd7, 0x06,
+    0x6b, 0x29, 0x78, 0xdd, 0x2e, 0x06, 0x72, 0x9d, 0x18, 0xd9, 0xe6, 0x52,
+    0xdb, 0x68, 0x1b, 0xf7, 0x00, 0x32, 0x7a, 0xfa, 0xc9, 0xaf, 0x7a, 0x72,
+    0xd3, 0xde, 0x90, 0x3c, 0x42, 0x3c, 0xe8, 0xe9, 0xcb, 0x4f, 0x7a, 0x40,
+    0xf1, 0x08, 0xf3, 0xa1, 0xcd, 0xb5, 0x86, 0x0a, 0x09, 0x3c, 0xa1, 0x45,
+    0xbb, 0x4e, 0x5c, 0x2d, 0x09, 0x76, 0x35, 0xa2, 0xee, 0x96, 0x6d, 0xeb,
+    0x51, 0x5a, 0x1a, 0x76, 0x3f, 0x3a, 0xa6, 0x73, 0xc4, 0x25, 0x5b, 0x43,
+    0x77, 0xbc, 0x1a, 0x6d, 0x62, 0xb3, 0xc7, 0xb3, 0xb2, 0xf2, 0x58, 0x53,
+    0x8e, 0x3a, 0xfb, 0x85, 0xe7, 0x9d, 0x70, 0xe5, 0x4e, 0x2c, 0xf1, 0x3b,
+    0xb7, 0x0f, 0x70, 0xaf, 0x7a, 0x72, 0xd3, 0xde, 0x90, 0x3c, 0x42, 0x3c,
+    0xe8, 0xe9, 0xcb, 0x4f, 0x7a, 0x40, 0xf1, 0x08, 0xf3, 0xa6, 0xe7, 0x29,
+    0x79, 0x05, 0x04, 0xbc, 0x06, 0xa3, 0xf5, 0x7a, 0xe9, 0xf0, 0xae, 0xfd,
+    0x06, 0x8a, 0x5f, 0xa8, 0x6f, 0x76, 0xa5, 0x58, 0x2e, 0x69, 0x4d, 0xce,
+    0x09, 0x51, 0x8a, 0xe8, 0x00, 0x48, 0x46, 0x49, 0xd8, 0x3e, 0xda, 0x2b,
+    0xc1, 0xe8, 0xff, 0xd9
+};
+
+unsigned int image_size = 4096;
+
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_background52.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_set_background_buffer(worksheet, image_buffer, image_size);
+
+    return workbook_close(workbook);
+}

test/functional/test_background.py

@@ -0,0 +1,44 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+#
+import os
+import pytest
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_background01(self):
+        self.run_exe_test('test_background01')
+
+    def test_background02(self):
+        self.run_exe_test('test_background02')
+
+    def test_background03(self):
+        self.run_exe_test('test_background03')
+
+    @pytest.mark.skipif(os.environ.get('USE_NO_MD5'), reason="compiled without MD5 support")
+    def test_background04(self):
+        self.run_exe_test('test_background04')
+
+    def test_background05(self):
+        self.run_exe_test('test_background05')
+
+    def test_background06(self):
+        self.ignore_elements = {'xl/worksheets/sheet1.xml': ['<pageSetup']}
+        self.run_exe_test('test_background06')
+
+    def test_background07(self):
+        self.ignore_elements = {'xl/worksheets/sheet1.xml': ['<pageSetup']}
+        self.run_exe_test('test_background07')
+
+    # Same as background02 except with an image buffer.
+    def test_background52(self):
+        self.run_exe_test('test_background52', 'background02.xlsx')
+

test/functional/test_image.py

@@ -14,8 +14,6 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
     Test file created with libxlsxwriter against a file created by Excel.
 
     """
-    # self.ignore_files = ['xl/drawings/drawing1.xml']
-
     def test_image01(self):
         self.run_exe_test('test_image01')