new code for generating hashes

7 files changed, 571 insertions, 0 deletions

diff --git a/new/README b/new/README
new file mode 100644
index 000000000..a01ac2d77
--- /dev/null
+++ b/new/README
@@ -0,0 +1,16 @@
+To generate hashes and store it in the same folder,
+
+	1) sudo make 
+		(set resoluton in DPI by passing argument
+			example: sudo make DPI=100, if not specified,default is 72)
+
+	2) Usage   ./hash <font_file> <pt_size> <render_mode>
+	
+        Hashes will be saved in a file named $(font)_$(pt_size)_$(render_mode).hash 
+
+        By default, hashes of 256-level gray bitmaps will be generated
+
+        Values for render_mode    0 - monochrome
+                                  1 - anti-aliased
+                                  2 - lcd horizontal-RGB
+                                  3 - lcd vertical-RGB
\ No newline at end of file
diff --git a/new/bitmap.c b/new/bitmap.c
new file mode 100644
index 000000000..923d072f3
--- /dev/null
+++ b/new/bitmap.c
@@ -0,0 +1,29 @@
+#include "bitmap.h"
+
+HASH_128 * Generate_Hash_x64_128(FT_Bitmap * bitmap, HASH_128 * murmur)
+{    
+    int seed = 99; // Dont change
+
+    MurmurHash3_x64_128(bitmap->buffer, (bitmap->pitch * bitmap->rows), seed, murmur->hash);
+
+    return murmur;
+}
+
+HASH_128 * Generate_Hash_x86_128(FT_Bitmap * bitmap, HASH_128 * murmur)
+{    
+    int seed = 99; // Dont change
+
+    MurmurHash3_x86_128(bitmap->buffer, (bitmap->pitch * bitmap->rows), seed, murmur->hash);
+
+    return murmur;
+}
+
+HASH_32 * Generate_Hash_x86_32(FT_Bitmap * bitmap, HASH_32 * murmur)
+{    
+    int seed = 99; // Dont change
+
+    MurmurHash3_x86_32(bitmap->buffer, (bitmap->pitch * bitmap->rows), seed, murmur->hash);
+
+    return murmur;
+}
+
diff --git a/new/bitmap.h b/new/bitmap.h
new file mode 100644
index 000000000..fb7ab12e5
--- /dev/null
+++ b/new/bitmap.h
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <ft2build.h>
+#include "murmur3.h"            // MurmurHash3_x64_128 header file
+#include <unistd.h>
+
+#include FT_FREETYPE_H
+#include FT_MODULE_H
+#include FT_LCD_FILTER_H
+#include FT_BITMAP_H
+
+#define BITS_PER_PIXEL_RGBA 32
+
+typedef struct {                // To store 32bit Hash
+    FT_UInt32 hash[1];
+}HASH_32;
+
+typedef struct {                // To store 128bit Hash
+    FT_UInt32 hash[4];
+}HASH_128;
+
+//-------------------------------------------------------------------------------
+
+HASH_32 * Generate_Hash_x86_32(FT_Bitmap * bitmap, HASH_32 * murmur);
+HASH_128 * Generate_Hash_x86_128(FT_Bitmap * bitmap, HASH_128 * murmur);
+HASH_128 * Generate_Hash_x64_128(FT_Bitmap * bitmap, HASH_128 * murmur);
+
+//-------------------------------------------------------------------------------
diff --git a/new/hash_to_file.c b/new/hash_to_file.c
new file mode 100644
index 000000000..64000be80
--- /dev/null
+++ b/new/hash_to_file.c
@@ -0,0 +1,141 @@
+#include "bitmap.h"
+
+int main (int argc, char const *argv[])
+{
+	FT_Library      library;
+    FT_Face         face;
+    FT_GlyphSlot    slot;
+
+    FT_Bitmap*      bitmap;
+
+    FT_Error        error;
+
+    const char*     font_file;
+    int       		size;
+    int     		render_mode; // argument 
+
+    int 			load_flag;	 // FT_LOAD_XXX
+    int             render_flag; // FT_RENDER_MODE_XXX
+    int 			target_flag; // FT_LOAD_TARGET_XXX
+	char* 			render_type; // for file_name 	
+
+	char 			name[100]; // hashes file name
+	int i; // for loop
+
+    if (argc != 4)
+    {
+        printf("\nTo generate MurmurHash3 hash values of all glyphs\n");
+        printf("Hashes will be saved in a file named $(font)_$(pt_size)_$(render_mode).hash \n\n");
+
+        printf("By default, hashes of 256-level gray bitmaps will be generated\n\n");
+
+        printf("Usage   ./<exe> <font_file> <pt_size> <render_mode>\n\n");
+
+        printf("Values for render_mode    0 - monochrome\n");
+        printf("                          1 - anti-aliased\n");
+        printf("                          2 - lcd horizontal-RGB\n");
+        printf("                          3 - lcd vertical-RGB\n");
+
+        return 1;
+    }
+
+    font_file 	=     argv[1];
+    size 		=     atof(argv[2]); 
+    render_mode =     atoi(argv[3]); 
+
+    error = FT_Init_FreeType( &library );
+    if(error){
+        printf("Error while initialising library\n");
+    }
+
+    error = FT_New_Face( library, 
+                         font_file, 
+                         0, 
+                         &face );
+    if(error){
+        printf("Error loading new face\n");
+    }
+
+    error = FT_Set_Char_Size( face,
+                              size * 64, 
+                              0, 
+                              DPI,
+                              0 );
+    if(error){
+        printf("Error setting character size\n");
+    }
+
+    switch ( render_mode ) {
+		case 0: render_flag 	= FT_RENDER_MODE_MONO;
+				load_flag 		= FT_LOAD_DEFAULT;
+				target_flag 	= FT_LOAD_TARGET_MONO;
+				render_type     = "mono";
+				break;
+
+		case 1:	render_flag 	= FT_RENDER_MODE_NORMAL;
+				load_flag 		= FT_LOAD_DEFAULT;
+				target_flag 	= FT_LOAD_TARGET_NORMAL;
+				render_type     = "gray";
+				break;
+
+		case 2:	render_flag 	= FT_RENDER_MODE_LCD;
+				load_flag 		= FT_LOAD_DEFAULT;
+				target_flag 	= FT_LOAD_TARGET_LCD;
+				render_type     = "lcd_rgb";
+				break;
+
+		case 3:	render_flag 	= FT_RENDER_MODE_LCD_V;
+				load_flag 		= FT_LOAD_DEFAULT;
+				target_flag 	= FT_LOAD_TARGET_LCD_V;
+				render_type     = "lcd_ver_rgb";
+				break;
+
+		default:render_flag 	= FT_RENDER_MODE_NORMAL;
+				load_flag 		= FT_LOAD_DEFAULT;
+				target_flag 	= FT_LOAD_TARGET_NORMAL;
+				render_type     = "gray";
+	}
+
+	slot = face->glyph;
+
+	FILE* fp;
+
+	sprintf(name,"./hashes/%s_%d_%s.hash",font_file,
+								size,
+								render_type);
+
+	fp = fopen(name,"w");
+
+	for (i = 0; i < face->num_glyphs; ++i)
+	{
+		error = FT_Load_Glyph( face,
+                           i, 
+                           load_flag | target_flag);
+    	if(error){
+        	printf("Error loading glyph\n");
+    	}
+
+    	FT_Render_Glyph( slot, 
+                     	 render_flag);
+    	if(error){
+        	printf("Error rendering the glyph\n");
+    	}
+
+    	bitmap = &slot->bitmap;
+
+    	HASH_128 *  murmur = (HASH_128 *) malloc(sizeof(HASH_128)) ;
+    	murmur = Generate_Hash_x64_128(bitmap,murmur);	
+
+    	fprintf(fp, "%08x %08x %08x %08x\n", murmur->hash[0], // Print hash
+                                    		 murmur->hash[1],
+                                    		 murmur->hash[2], 
+                                    		 murmur->hash[3]);
+	}
+	fclose(fp);
+
+	FT_Done_Face    ( face );
+    FT_Done_FreeType( library );
+
+    return 0;
+    
+}
diff --git a/new/makefile b/new/makefile
new file mode 100644
index 000000000..d60a6d685
--- /dev/null
+++ b/new/makefile
@@ -0,0 +1,22 @@
+# Define required macros here
+
+SHELL = /bin/sh
+
+SRC = hash_to_file.c bitmap.c murmur3.c 
+OBJS = $(src:.c=.o)
+
+CFLAGS = -Wall -g
+CC = gcc
+INCLUDE = -I /usr/local/include/freetype2/ 
+LIBS = -lfreetype
+
+DPI = 72
+
+hash:$(SRC)
+	$(CC) $(CFLAGS) $(INCLUDE) -DDPI=$(DPI) -o $@  $(SRC) $(OBJS) $(LIBS)
+
+.PHONY: clean
+clean:
+	-rm -f *.o
+
+
diff --git a/new/murmur3.c b/new/murmur3.c
new file mode 100644
index 000000000..484ebfd03
--- /dev/null
+++ b/new/murmur3.c
@@ -0,0 +1,312 @@
+//-----------------------------------------------------------------------------
+// Note - The x86 and x64 versions do _not_ produce the same results, as the
+// algorithms are optimized for their respective platforms. You can still
+// compile and run any of them on any platform, but your performance with the
+// non-native version will be less than optimal.
+
+#include "murmur3.h"
+
+//-----------------------------------------------------------------------------
+// Platform-specific functions and macros
+
+#ifdef __GNUC__
+#define FORCE_INLINE __attribute__((always_inline)) inline
+#else
+#define FORCE_INLINE inline
+#endif
+
+static FORCE_INLINE uint32_t rotl32 ( uint32_t x, int8_t r )
+{
+  return (x << r) | (x >> (32 - r));
+}
+
+static FORCE_INLINE uint64_t rotl64 ( uint64_t x, int8_t r )
+{
+  return (x << r) | (x >> (64 - r));
+}
+
+#define	ROTL32(x,y)	rotl32(x,y)
+#define ROTL64(x,y)	rotl64(x,y)
+
+#define BIG_CONSTANT(x) (x##LLU)
+
+//-----------------------------------------------------------------------------
+// Block read - if your platform needs to do endian-swapping or can only
+// handle aligned reads, do the conversion here
+
+#define getblock(p, i) (p[i])
+
+//-----------------------------------------------------------------------------
+// Finalization mix - force all bits of a hash block to avalanche
+
+static FORCE_INLINE uint32_t fmix32 ( uint32_t h )
+{
+  h ^= h >> 16;
+  h *= 0x85ebca6b;
+  h ^= h >> 13;
+  h *= 0xc2b2ae35;
+  h ^= h >> 16;
+
+  return h;
+}
+
+//----------
+
+static FORCE_INLINE uint64_t fmix64 ( uint64_t k )
+{
+  k ^= k >> 33;
+  k *= BIG_CONSTANT(0xff51afd7ed558ccd);
+  k ^= k >> 33;
+  k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);
+  k ^= k >> 33;
+
+  return k;
+}
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x86_32 ( const void * key, int len,
+                          uint32_t seed, void * out )
+{
+  const uint8_t * data = (const uint8_t*)key;
+  const int nblocks = len / 4;
+  int i;
+
+  uint32_t h1 = seed;
+
+  uint32_t c1 = 0xcc9e2d51;
+  uint32_t c2 = 0x1b873593;
+
+  //----------
+  // body
+
+  const uint32_t * blocks = (const uint32_t *)(data + nblocks*4);
+
+  for(i = -nblocks; i; i++)
+  {
+    uint32_t k1 = getblock(blocks,i);
+
+    k1 *= c1;
+    k1 = ROTL32(k1,15);
+    k1 *= c2;
+    
+    h1 ^= k1;
+    h1 = ROTL32(h1,13); 
+    h1 = h1*5+0xe6546b64;
+  }
+
+  //----------
+  // tail
+
+  const uint8_t * tail = (const uint8_t*)(data + nblocks*4);
+
+  uint32_t k1 = 0;
+
+  switch(len & 3)
+  {
+  case 3: k1 ^= tail[2] << 16;
+  case 2: k1 ^= tail[1] << 8;
+  case 1: k1 ^= tail[0];
+          k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
+  };
+
+  //----------
+  // finalization
+
+  h1 ^= len;
+
+  h1 = fmix32(h1);
+
+  *(uint32_t*)out = h1;
+} 
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x86_128 ( const void * key, const int len,
+                           uint32_t seed, void * out )
+{
+  const uint8_t * data = (const uint8_t*)key;
+  const int nblocks = len / 16;
+  int i;
+
+  uint32_t h1 = seed;
+  uint32_t h2 = seed;
+  uint32_t h3 = seed;
+  uint32_t h4 = seed;
+
+  uint32_t c1 = 0x239b961b; 
+  uint32_t c2 = 0xab0e9789;
+  uint32_t c3 = 0x38b34ae5; 
+  uint32_t c4 = 0xa1e38b93;
+
+  //----------
+  // body
+
+  const uint32_t * blocks = (const uint32_t *)(data + nblocks*16);
+
+  for(i = -nblocks; i; i++)
+  {
+    uint32_t k1 = getblock(blocks,i*4+0);
+    uint32_t k2 = getblock(blocks,i*4+1);
+    uint32_t k3 = getblock(blocks,i*4+2);
+    uint32_t k4 = getblock(blocks,i*4+3);
+
+    k1 *= c1; k1  = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
+
+    h1 = ROTL32(h1,19); h1 += h2; h1 = h1*5+0x561ccd1b;
+
+    k2 *= c2; k2  = ROTL32(k2,16); k2 *= c3; h2 ^= k2;
+
+    h2 = ROTL32(h2,17); h2 += h3; h2 = h2*5+0x0bcaa747;
+
+    k3 *= c3; k3  = ROTL32(k3,17); k3 *= c4; h3 ^= k3;
+
+    h3 = ROTL32(h3,15); h3 += h4; h3 = h3*5+0x96cd1c35;
+
+    k4 *= c4; k4  = ROTL32(k4,18); k4 *= c1; h4 ^= k4;
+
+    h4 = ROTL32(h4,13); h4 += h1; h4 = h4*5+0x32ac3b17;
+  }
+
+  //----------
+  // tail
+
+  const uint8_t * tail = (const uint8_t*)(data + nblocks*16);
+
+  uint32_t k1 = 0;
+  uint32_t k2 = 0;
+  uint32_t k3 = 0;
+  uint32_t k4 = 0;
+
+  switch(len & 15)
+  {
+  case 15: k4 ^= tail[14] << 16;
+  case 14: k4 ^= tail[13] << 8;
+  case 13: k4 ^= tail[12] << 0;
+           k4 *= c4; k4  = ROTL32(k4,18); k4 *= c1; h4 ^= k4;
+
+  case 12: k3 ^= tail[11] << 24;
+  case 11: k3 ^= tail[10] << 16;
+  case 10: k3 ^= tail[ 9] << 8;
+  case  9: k3 ^= tail[ 8] << 0;
+           k3 *= c3; k3  = ROTL32(k3,17); k3 *= c4; h3 ^= k3;
+
+  case  8: k2 ^= tail[ 7] << 24;
+  case  7: k2 ^= tail[ 6] << 16;
+  case  6: k2 ^= tail[ 5] << 8;
+  case  5: k2 ^= tail[ 4] << 0;
+           k2 *= c2; k2  = ROTL32(k2,16); k2 *= c3; h2 ^= k2;
+
+  case  4: k1 ^= tail[ 3] << 24;
+  case  3: k1 ^= tail[ 2] << 16;
+  case  2: k1 ^= tail[ 1] << 8;
+  case  1: k1 ^= tail[ 0] << 0;
+           k1 *= c1; k1  = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
+  };
+
+  //----------
+  // finalization
+
+  h1 ^= len; h2 ^= len; h3 ^= len; h4 ^= len;
+
+  h1 += h2; h1 += h3; h1 += h4;
+  h2 += h1; h3 += h1; h4 += h1;
+
+  h1 = fmix32(h1);
+  h2 = fmix32(h2);
+  h3 = fmix32(h3);
+  h4 = fmix32(h4);
+
+  h1 += h2; h1 += h3; h1 += h4;
+  h2 += h1; h3 += h1; h4 += h1;
+
+  ((uint32_t*)out)[0] = h1;
+  ((uint32_t*)out)[1] = h2;
+  ((uint32_t*)out)[2] = h3;
+  ((uint32_t*)out)[3] = h4;
+}
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x64_128 ( const void * key, const int len,
+                           const uint32_t seed, void * out )
+{
+  const uint8_t * data = (const uint8_t*)key;
+  const int nblocks = len / 16;
+  int i;
+
+  uint64_t h1 = seed;
+  uint64_t h2 = seed;
+
+  uint64_t c1 = BIG_CONSTANT(0x87c37b91114253d5);
+  uint64_t c2 = BIG_CONSTANT(0x4cf5ad432745937f);
+
+  //----------
+  // body
+
+  const uint64_t * blocks = (const uint64_t *)(data);
+
+  for(i = 0; i < nblocks; i++)
+  {
+    uint64_t k1 = getblock(blocks,i*2+0);
+    uint64_t k2 = getblock(blocks,i*2+1);
+
+    k1 *= c1; k1  = ROTL64(k1,31); k1 *= c2; h1 ^= k1;
+
+    h1 = ROTL64(h1,27); h1 += h2; h1 = h1*5+0x52dce729;
+
+    k2 *= c2; k2  = ROTL64(k2,33); k2 *= c1; h2 ^= k2;
+
+    h2 = ROTL64(h2,31); h2 += h1; h2 = h2*5+0x38495ab5;
+  }
+
+  //----------
+  // tail
+
+  const uint8_t * tail = (const uint8_t*)(data + nblocks*16);
+
+  uint64_t k1 = 0;
+  uint64_t k2 = 0;
+
+  switch(len & 15)
+  {
+  case 15: k2 ^= (uint64_t)(tail[14]) << 48;
+  case 14: k2 ^= (uint64_t)(tail[13]) << 40;
+  case 13: k2 ^= (uint64_t)(tail[12]) << 32;
+  case 12: k2 ^= (uint64_t)(tail[11]) << 24;
+  case 11: k2 ^= (uint64_t)(tail[10]) << 16;
+  case 10: k2 ^= (uint64_t)(tail[ 9]) << 8;
+  case  9: k2 ^= (uint64_t)(tail[ 8]) << 0;
+           k2 *= c2; k2  = ROTL64(k2,33); k2 *= c1; h2 ^= k2;
+
+  case  8: k1 ^= (uint64_t)(tail[ 7]) << 56;
+  case  7: k1 ^= (uint64_t)(tail[ 6]) << 48;
+  case  6: k1 ^= (uint64_t)(tail[ 5]) << 40;
+  case  5: k1 ^= (uint64_t)(tail[ 4]) << 32;
+  case  4: k1 ^= (uint64_t)(tail[ 3]) << 24;
+  case  3: k1 ^= (uint64_t)(tail[ 2]) << 16;
+  case  2: k1 ^= (uint64_t)(tail[ 1]) << 8;
+  case  1: k1 ^= (uint64_t)(tail[ 0]) << 0;
+           k1 *= c1; k1  = ROTL64(k1,31); k1 *= c2; h1 ^= k1;
+  };
+
+  //----------
+  // finalization
+
+  h1 ^= len; h2 ^= len;
+
+  h1 += h2;
+  h2 += h1;
+
+  h1 = fmix64(h1);
+  h2 = fmix64(h2);
+
+  h1 += h2;
+  h2 += h1;
+
+  ((uint64_t*)out)[0] = h1;
+  ((uint64_t*)out)[1] = h2;
+}
+
+//-----------------------------------------------------------------------------
+
diff --git a/new/murmur3.h b/new/murmur3.h
new file mode 100644
index 000000000..90878b00d
--- /dev/null
+++ b/new/murmur3.h
@@ -0,0 +1,24 @@
+#ifndef _MURMURHASH3_H_
+#define _MURMURHASH3_H_
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//-----------------------------------------------------------------------------
+
+void MurmurHash3_x86_32 (const void *key, int len, uint32_t seed, void *out);
+
+void MurmurHash3_x86_128(const void *key, int len, uint32_t seed, void *out);
+
+void MurmurHash3_x64_128(const void *key, int len, uint32_t seed, void *out);
+
+//-----------------------------------------------------------------------------
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _MURMURHASH3_H_