speed up PNG saving by about factor 4 by using fastest zlib mode, and no filters...

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@9766 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/image_png.c b/image_png.c
index 4dc0fd93072fbc4e559d0de03c5b508b35a10ad6..d194931523c751ca2fafe607d056f7d50c6fd655 100644 (file)
--- a/image_png.c
+++ b/image_png.c
@@ -37,6 +37,7 @@ static void*                  (*qpng_create_write_struct)     (const char*, void*, void(*)(void *pn
 static void*                   (*qpng_create_info_struct)      (void*);
 static void                            (*qpng_read_info)                       (void*, void*);
 static void                            (*qpng_set_compression_level)   (void*, int);
+static void                            (*qpng_set_filter)                      (void*, int, int);
 static void                            (*qpng_set_expand)                      (void*);
 static void                            (*qpng_set_gray_1_2_4_to_8)     (void*);
 static void                            (*qpng_set_palette_to_rgb)      (void*);
@@ -73,6 +74,7 @@ static dllfunction_t pngfuncs[] =
        {"png_create_info_struct",      (void **) &qpng_create_info_struct},
        {"png_read_info",                       (void **) &qpng_read_info},
        {"png_set_compression_level",   (void **) &qpng_set_compression_level},
+       {"png_set_filter",                      (void **) &qpng_set_filter},
        {"png_set_expand",                      (void **) &qpng_set_expand},
        {"png_set_gray_1_2_4_to_8",     (void **) &qpng_set_gray_1_2_4_to_8},
        {"png_set_palette_to_rgb",      (void **) &qpng_set_palette_to_rgb},
@@ -417,13 +419,22 @@ unsigned char *PNG_LoadImage_BGRA (const unsigned char *raw, int filesize)
 =================================================================
 */
 
+#define Z_BEST_SPEED 1
 #define Z_BEST_COMPRESSION 9
+#define PNG_INTERLACE_NONE 0
 #define PNG_INTERLACE_ADAM7 1
 #define PNG_FILTER_TYPE_BASE 0
 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
 #define PNG_COMPRESSION_TYPE_BASE 0
 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
-
+#define PNG_NO_FILTERS     0x00
+#define PNG_FILTER_NONE    0x08
+#define PNG_FILTER_SUB     0x10
+#define PNG_FILTER_UP      0x20
+#define PNG_FILTER_AVG     0x40
+#define PNG_FILTER_PAETH   0x80
+#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
+                         PNG_FILTER_AVG | PNG_FILTER_PAETH)
 
 /*
 ====================
@@ -484,9 +495,11 @@ qboolean PNG_SaveImage_preflipped (const char *filename, int width, int height,
        my_png.outfile = file;
        qpng_set_write_fn(png, ioBuffer, PNG_fWriteData, PNG_fFlushData);
 
-       qpng_set_compression_level(png, Z_BEST_COMPRESSION);
-
+       //qpng_set_compression_level(png, Z_BEST_COMPRESSION);
+       qpng_set_compression_level(png, Z_BEST_SPEED);
        qpng_set_IHDR(png, pnginfo, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_ADAM7, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+       //qpng_set_IHDR(png, pnginfo, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+       qpng_set_filter(png, 0, PNG_NO_FILTERS);
        qpng_write_info(png, pnginfo);
        qpng_set_packing(png);
        qpng_set_bgr(png);
@@ -503,5 +516,6 @@ qboolean PNG_SaveImage_preflipped (const char *filename, int width, int height,
        qpng_destroy_write_struct(&png, &pnginfo);
 
        FS_Close (file);
+
        return true;
 }