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Performance improvements for linear encoding and raster output

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- use fixed-length string tables (mostly) instead of (char *) pointer ones
   (saves ~40K)
 - re-use C128Table for CODABLOCKF and CODE16K
   (required removal of Stop character and extra CODE16K-only entry)
 - use pointer to destination and copy (memcpy/strcpy(), bin_append_posn())
   instead of concatenating (strcat()) (mostly)
 - replace last remaining bin_append()s with bin_append_posn();
   bin_append() removed
 - add length arg to toupper() and expand() (avoids strlen())
 - change is_sane() to use table-based flags (avoids an iteration)
 - rename lookup() to is_sane_lookup() and change to check and return posns
   and use in pointer to destination loops (avoids strcat()s)
 - remove special case PHARMA in expand() (dealt with in pharma())
 - make #define SILVER/CALCIUM/TECHNETIUM/KRSET etc static strings
 - replace strchr() -> posn()
 - CODE128: populate destination once in checksum loop; re-use and export
   some more routines (c128_set_a/b/c(), c128_put_in_set()) for sharing;
   prefix defines (SHIFTA -> C128_SHIFTA etc) and existing exported routines
 - use factor XOR toggle trick in checksum calcs (avoids branch)
 - raster.c: fill out single 1-pixel row and copy using new draw_bar_line(),
   copy_bar_line() routines; similarly in buffer_plot compare previous line &
   copy if same (same technique as used to improve non-half-integer scaling,
   significant performance increase, (c) codemonkey82);
   also done for PNG (BMP/GIF/PCX/TIFF not done)
 - raster/vector/output.c: shorten "output_" prefix -> "out_";
   sync vector to other raster changes to try to keep source files similar
 - 2of5.c: prefix "c25_"
JAPANPOST: return error if input data truncated (backward incompatible)
DAFT: max chars 50 -> 100
common.c: istwodigit() -> is_twodigit()
common.c/emf.c/output.c: use some further stripf()s (MSVC6 float variations)
library.c: new check_output_args() helper
zint.h: add BARCODE_LAST marker and use in library.c
QRCODE: remove a NOLINT (requires clang-tidy-13), one remaining
CMake: separate no-optimize from ZINT_DEBUG into new ZINT_NOOPT option
This commit is contained in:
gitlost 2021-10-20 23:05:30 +01:00
parent e8b59aa696
commit fab7435fac
72 changed files with 3501 additions and 2380 deletions
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34
backend/png.c
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@ -46,8 +46,6 @@
#include <zlib.h>
#include <setjmp.h>
#define SSET "0123456789ABCDEF"
/* Note if change this need to change "backend/tests/test_png.c" definition also */
struct wpng_error_type {
struct zint_symbol *symbol;
@ -300,26 +298,34 @@ INTERNAL int png_pixel_plot(struct zint_symbol *symbol, unsigned char *pixelbuf)
pb = pixelbuf;
if (bit_depth == 1) {
for (row = 0; row < symbol->bitmap_height; row++) {
unsigned char *image_data = outdata;
for (column = 0; column < symbol->bitmap_width; column += 8, image_data++) {
unsigned char byte = 0;
for (i = 0; i < 8 && column + i < symbol->bitmap_width; i++, pb++) {
byte |= map[*pb] << (7 - i);
if (row && memcmp(pb, pb - symbol->bitmap_width, symbol->bitmap_width) == 0) {
pb += symbol->bitmap_width;
} else {
unsigned char *image_data = outdata;
for (column = 0; column < symbol->bitmap_width; column += 8, image_data++) {
unsigned char byte = 0;
for (i = 0; i < 8 && column + i < symbol->bitmap_width; i++, pb++) {
byte |= map[*pb] << (7 - i);
}
*image_data = byte;
}
*image_data = byte;
}
/* write row contents to file */
png_write_row(png_ptr, outdata);
}
} else { /* Bit depth 4 */
for (row = 0; row < symbol->bitmap_height; row++) {
unsigned char *image_data = outdata;
for (column = 0; column < symbol->bitmap_width; column += 2, image_data++) {
unsigned char byte = map[*pb++] << 4;
if (column + 1 < symbol->bitmap_width) {
byte |= map[*pb++];
if (row && memcmp(pb, pb - symbol->bitmap_width, symbol->bitmap_width) == 0) {
pb += symbol->bitmap_width;
} else {
unsigned char *image_data = outdata;
for (column = 0; column < symbol->bitmap_width; column += 2, image_data++) {
unsigned char byte = map[*pb++] << 4;
if (column + 1 < symbol->bitmap_width) {
byte |= map[*pb++];
}
*image_data = byte;
}
*image_data = byte;
}
/* write row contents to file */
png_write_row(png_ptr, outdata);