More tweaks towards colour FAXing

libs/spandsp/src/spandsp/image_translate.h

@@ -74,6 +74,8 @@ SPAN_DECLARE(int) image_translate_get_output_length(image_translate_state_t *s);
     \return 0 for success, else -1. */
 SPAN_DECLARE(int) image_translate_set_row_read_handler(image_translate_state_t *s, t4_row_read_handler_t row_read_handler, void *row_read_user_data);
 
+SPAN_DECLARE(int) image_translate_restart(image_translate_state_t *s, int input_length);
+
 /*! \brief Initialise an image translation context for rescaling and squashing a gray scale
            or colour image to a bi-level FAX type image.
     \param s The image translation context.

libs/spandsp/src/spandsp/private/t4_tx.h

@@ -163,6 +163,10 @@ struct t4_tx_state_s
     } encoder;
 
     image_translate_state_t translator;
+    uint8_t *pack_buf;
+    int pack_ptr;
+    int pack_row;
+    int pack_bit_mask;
 
     int apply_lab;
     lab_params_t lab_params;

libs/spandsp/src/spandsp/t30.h

@@ -479,7 +479,7 @@ typedef struct
     /*! \brief The size of the image, in bytes */
     int image_size;
     /*! \brief The type of compression used between the FAX machines */
-    int encoding;
+    int compression;
     /*! \brief The number of bad pixel rows in the most recent page. */
     int bad_rows;
     /*! \brief The largest number of bad pixel rows in a block in the most recent page. */

libs/spandsp/src/spandsp/t43.h

@@ -41,6 +41,17 @@ typedef struct t43_encode_state_s t43_encode_state_t;
 /*! State of a working instance of the T.43 decoder */
 typedef struct t43_decode_state_s t43_decode_state_t;
 
+enum
+{
+    T43_IMAGE_TYPE_RGB_BILEVEL = 0,
+    T43_IMAGE_TYPE_CMY_BILEVEL = 1,
+    T43_IMAGE_TYPE_CMYK_BILEVEL = 2,
+    T43_IMAGE_TYPE_8BIT_COLOUR_PALETTE = 16,
+    T43_IMAGE_TYPE_12BIT_COLOUR_PALETTE = 17,
+    T43_IMAGE_TYPE_GRAY = 32,
+    T43_IMAGE_TYPE_COLOUR = 48
+};
+
 #if defined(__cplusplus)
 extern "C"
 {
@@ -59,6 +70,8 @@ SPAN_DECLARE(int) t43_encode_set_image_length(t43_encode_state_t *s, uint32_t le
 
 SPAN_DECLARE(void) t43_encode_abort(t43_encode_state_t *s);
 
+SPAN_DECLARE(int) t43_encode_set_image_type(t43_encode_state_t *s, int image_type);
+
 SPAN_DECLARE(void) t43_encode_comment(t43_encode_state_t *s, const uint8_t comment[], size_t len);
 
 /*! \brief Check if we are at the end of the current document page.
@@ -114,8 +127,6 @@ SPAN_DECLARE(int) t43_encode_release(t43_encode_state_t *s);
     \return 0 for OK, else -1. */
 SPAN_DECLARE(int) t43_encode_free(t43_encode_state_t *s);
 
-SPAN_DECLARE(int) t43_create_header(t43_decode_state_t *s, uint8_t data[], size_t len);
-
 SPAN_DECLARE(void) t43_decode_rx_status(t43_decode_state_t *s, int status);
 
 /*! \brief Decode a chunk of T.43 data.

libs/spandsp/src/spandsp/t4_rx.h

@@ -139,14 +139,13 @@ typedef enum
 typedef enum
 {
     T4_X_RESOLUTION_100 = 3937,
-    T4_X_RESOLUTION_R4 = 4016,
+    T4_X_RESOLUTION_R4 = 4020,
     T4_X_RESOLUTION_200 = 7874,
-    T4_X_RESOLUTION_R8 = 8031,
+    T4_X_RESOLUTION_R8 = 8040,
     T4_X_RESOLUTION_300 = 11811,
     T4_X_RESOLUTION_400 = 15748,
-    T4_X_RESOLUTION_R16 = 16063,
+    T4_X_RESOLUTION_R16 = 16080,
     T4_X_RESOLUTION_600 = 23622,
-    T4_X_RESOLUTION_800 = 31496,
     T4_X_RESOLUTION_1200 = 47244
 } t4_image_x_resolution_t;
 

libs/spandsp/src/t30.c

@@ -6704,7 +6704,7 @@ SPAN_DECLARE(void) t30_get_transfer_statistics(t30_state_t *s, t30_stats_t *t)
     t->width = stats.width;
     t->length = stats.length;
 
-    t->encoding = stats.encoding;
+    t->compression = stats.encoding;
     t->image_size = stats.line_image_size;
     t->current_status = s->current_status;
     t->rtn_events = s->rtn_events;

libs/spandsp/src/t4_tx.c

@@ -112,7 +112,6 @@ static const res_table_t x_res_table[] =
     { 400.0f/CM_PER_INCH, T4_X_RESOLUTION_400},
     { 408.0f/CM_PER_INCH, T4_X_RESOLUTION_R16},
     { 600.0f/CM_PER_INCH, T4_X_RESOLUTION_600},
-    { 800.0f/CM_PER_INCH, T4_X_RESOLUTION_800},
     {1200.0f/CM_PER_INCH, T4_X_RESOLUTION_1200},
     {             -1.00f, -1}
 };

libs/spandsp/tests/fax_utils.c

@@ -103,7 +103,7 @@ void fax_log_page_transfer_statistics(t30_state_t *s, const char *tag)
     printf("%s:   Pages in the file %d\n", tag, t.pages_in_file);
     printf("%s:   Bad rows %d, longest bad row run %d\n", tag, t.bad_rows, t.longest_bad_row_run);
     printf("%s:   Bad ECM frames %d\n", tag, t.error_correcting_mode_retries);
-    printf("%s:   Compression type %s (%d)\n", tag, t4_encoding_to_str(t.encoding), t.encoding);
+    printf("%s:   Compression type %s (%d)\n", tag, t4_encoding_to_str(t.compression), t.compression);
     printf("%s:   Compressed image size %d bytes\n", tag, t.image_size);
     printf("%s:   Image type %s (%s in the file)\n", tag, t4_image_type_to_str(t.type), t4_image_type_to_str(t.image_type));
     printf("%s:   Image size %d pels x %d pels (%d pels x %d pels in the file)\n", tag, t.width, t.length, t.image_width, t.image_length);