From: hackbard <hackbard>
Date: Thu, 7 Oct 2004 15:00:50 +0000 (+0000)
Subject: fixed bmp api, improved dft_2d ... though still seems to be broken
X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fapi.git;a=commitdiff_plain;h=515c7fc6da820714686f9bfc87ccb9743c57d692

fixed bmp api, improved dft_2d ... though still seems to be broken
---

diff --git a/bmp/bmp.c b/bmp/bmp.c
index 4d8c7ac..94e11d1 100644
--- a/bmp/bmp.c
+++ b/bmp/bmp.c
@@ -30,6 +30,9 @@ int bmp_shutdown(t_bmp *bmp) {
 
 int bmp_check_header_and_info(t_bmp *bmp) {
 
+  dprintf(bmp->outfd,"[bmp] magic identifier: %c%c\n",
+          bmp->hdr.identifier&0xff,bmp->hdr.identifier>>8);
+
   if(bmp->info.compression!=0) {
     dprintf(bmp->outfd,"[bmp] compression not supported\n");
     return B_NO_SUPPORT;
@@ -40,9 +43,9 @@ int bmp_check_header_and_info(t_bmp *bmp) {
     return B_NO_SUPPORT;
   }
     
-  if(bmp->hdr.offset!=B_H_SIZE+B_I_SIZE) {
+  if(bmp->hdr.offset!=BMP_H_SIZE+BMP_I_SIZE) {
     dprintf(bmp->outfd,"[bmp] files with %d bytes offset not supported\n",
-            bmp->hdr-offset);
+            bmp->hdr.offset);
     return B_NO_SUPPORT;
   }
 
@@ -55,9 +58,29 @@ int bmp_check_header_and_info(t_bmp *bmp) {
   return B_SUCCESS;
 }
 
+int bmp_alloc_map(t_bmp *bmp) {
+
+  int size;
+
+  size=bmp->width*bmp->height*3;
+
+  dprintf(bmp->outfd,"[bmp] alloc map memory (%d bytes)\n",size);
+
+  if((bmp->map=(t_pixel *)malloc(size))==NULL) {
+    dprintf(bmp->outfd,"[bmp] memory map alloc failed\n");
+    return B_E_MEM;
+  }
+
+  return B_SUCCESS;
+}
+
 int bmp_write_file(t_bmp *bmp) {
  
   int fill,xsize,size;
+  int y;
+  unsigned char buf[3];
+
+  memset(buf,0,3);
 
   if(!(bmp->mode&WRITE)) {
     dprintf(bmp->outfd,"[bmp] write mode not specified\n");
@@ -84,7 +107,7 @@ int bmp_write_file(t_bmp *bmp) {
   bmp->info.ic=0;
 
   /* write it */
-  if((bmp->fd=open(bmp->file,O_WRONLY)<0) {
+  if((bmp->fd=open(bmp->file,O_WRONLY|O_CREAT))<0) {
     dprintf(bmp->outfd,"[bmp] unable to open file %s\n",bmp->file);
     return B_NO_FILE;
   }
@@ -99,19 +122,30 @@ int bmp_write_file(t_bmp *bmp) {
     return B_E_WRITE_DATA;
   }
 
+  for(y=0;y<bmp->height;y++) {
+    if(write(bmp->fd,bmp->map+y*bmp->width,xsize)<xsize) {
+      dprintf(bmp->outfd,"[bmp] unable to write image data line %d\n",y);
+      return B_E_WRITE_DATA;
+    }
+    if(write(bmp->fd,buf,fill)<fill) {
+      dprintf(bmp->outfd,"[bmp] unable to write fill bytes\n");
+      return B_E_WRITE_DATA;
+    }
+  }
+
+  close(bmp->fd);
 
   return B_SUCCESS;
 }
 
 int bmp_read_file(t_bmp *bmp) {
 
-  unsigned char buf[BMP_HI_SIZE];
+  unsigned char buf[BMP_H_SIZE+BMP_I_SIZE];
   int y,xsize;
   int crop;
-  unsigned char *data;
 
   if(!(bmp->mode&READ)) {
-    dprintf(bmp->outfd,"[bmp] read mode not specified");
+    dprintf(bmp->outfd,"[bmp] read mode not specified\n");
     return B_WRONG_MODE;
   }
 
diff --git a/bmp/bmp.h b/bmp/bmp.h
index f25007d..4dd47f5 100644
--- a/bmp/bmp.h
+++ b/bmp/bmp.h
@@ -8,6 +8,10 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
 
 /* defines */
 #define B_SUCCESS 1
@@ -31,7 +35,7 @@ typedef struct s_bmp_hdr {
   unsigned short int reserved1;
   unsigned short int reserved2;
   unsigned int offset; /* <- 14 + 40 bytes = 0x36 */
-} t_bmp_hdr; /* 14 bytes */
+} __attribute__ ((packed)) t_bmp_hdr; /* 14 bytes */
 
 typedef struct s_bmp_info {
   unsigned int size; /* 40 bytes = 0x28 */
@@ -45,13 +49,13 @@ typedef struct s_bmp_info {
   unsigned int yres;
   unsigned int noc;
   unsigned int ic;
-} t_bmp_info; /* 40 bytes */
+} __attribute__ ((packed)) t_bmp_info; /* 40 bytes */
 
 typedef struct s_pixel {
   unsigned char r;
   unsigned char g;
   unsigned char b;
-} t_pixel;
+} __attribute__ ((packed)) t_pixel;
 
 typedef struct s_bmp {
   int outfd;
@@ -68,7 +72,11 @@ typedef struct s_bmp {
 } t_bmp;
 
 /* function prototypes */
-int bmp_init(t_bmp *bmp);
+int bmp_init(t_bmp *bmp,int outfd);
 int bmp_shutdown(t_bmp *bmp);
+int bmp_check_header_and_info(t_bmp *bmp);
+int bmp_alloc_map(t_bmp *bmp);
+int bmp_write_file(t_bmp *bmp);
+int bmp_read_file(t_bmp *bmp);
 
 #endif
diff --git a/fourier/fourier.c b/fourier/fourier.c
index d322bc0..4f395f5 100644
--- a/fourier/fourier.c
+++ b/fourier/fourier.c
@@ -103,7 +103,7 @@ int fourier_fft_1d_shutdown(t_fourier *fourier) {
 
 int fourier_fft_1d(t_fourier *fourier) {
 
-  int i,j;
+  int i;
 
   /* copy src to destination, destination is modified in place */
   memcpy(fourier->ftdata,fourier->data,fourier->data_len[0]*sizeof(t_complex));
@@ -117,7 +117,7 @@ int fourier_fft_1d(t_fourier *fourier) {
 
   for(i=0;i<fourier->data_len[0];i++) 
     dprintf(fourier->outfd,"%f %f\n",
-            fourier->ftdata[i]->r,fourier->revdata[i]->i);
+            fourier->ftdata[i].r,fourier->revdata[i]->r);
 
   return F_NOT_SUPPORTED;
 
@@ -163,32 +163,82 @@ int fourier_dft_2d(t_fourier *fourier) {
   int off_f,off_r;
   int u,v,x,y;
   int X,Y;
+  int size;
   double arg;
+  t_complex *data;
 
   X=fourier->data_len[0];
   Y=fourier->data_len[1];
 
+  size=X*Y;
+
+  data=(t_complex *)malloc(size*sizeof(t_complex));
+  if(data==NULL) {
+    dprintf(fourier->outfd,
+            "[fourier] malloc of %d bytes of temp data failed\n",size);
+    return F_ALLOC_FAIL;
+  }
+  memset(data,0,size*sizeof(t_complex));
+
   if(fourier->type&BWD) return F_NOT_SUPPORTED;
 
-  /* stupid way - actually you would do: ft_on_index_1(ft_on_index_2(f(x,y))) */
-  for(v=0;v<Y;v++) {
-    off=v*X;
+  /* stupid way */
+ 
+  // for(v=0;v<Y;v++) {
+  //   off_f=v*X;
+  //   for(u=0;u<X;u++) {
+  //     dprintf(fourier->outfd,"[fourier] (u=%d,v=%d)\n",u,v);
+  //     fourier->ftdata[off_f+u].r=0;
+  //     fourier->ftdata[off_f+u].i=0;
+  //     for(y=0;y<Y;y++) {
+  //       off_r=y*X;
+  //       for(x=0;x<X;x++) {
+  //        arg=-2.0*M_PI*((1.0*u*x)/X+(1.0*v*y)/Y);
+  //         fourier->ftdata[off_f+u].r+=(cos(arg)*fourier->data[off_r+x].r-sin(arg)*fourier->data[off_r+x].i);
+  //         fourier->ftdata[off_f+u].i+=(sin(arg)*fourier->data[off_r+x].r+cos(arg)*fourier->data[off_r+x].i);
+  //       }
+  //     }
+  //     fourier->ftdata[off_f+u].r/=(X*Y);
+  //     fourier->ftdata[off_f+u].i/=(X*Y);
+  //   }
+  // }
+
+  /* the more clever way ... */
+  // dft on index 1
+  off_f=0;
+  for(y=0;y<Y;y++) {
     for(u=0;u<X;u++) {
-      fourier->ftdata[off+u].r=0;
-      fourier->ftdata[off+u].i=0;
+      //dprintf(fourier->outfd,"[fourier] (u=%d,v=%d)\n",u,y);
+      for(x=0;x<X;x++) {
+        arg=-2.0*M_PI*u*x/X;
+        off_r=off_f+x;
+        data[off_f+u].r+=(cos(arg)*fourier->data[off_r].r-sin(arg)*fourier->data[off_r].i);
+        data[off_f+u].r+=(sin(arg)*fourier->data[off_r].r+cos(arg)*fourier->data[off_r].i);
+      }
+      data[off_f+u].r/=X;
+      data[off_f+u].i/=X;
+    }
+    off_f+=X;
+  }
+  //  dft on index 2 of 'index 1 transformed data'
+  off_f=0;
+  for(x=0;x<X;x++) {
+    for(v=0;v<Y;v++) {
+      //dprintf(fourier->outfd,"[fourier] (u=%d,v=%d)\n",v,x);
       for(y=0;y<Y;y++) {
-        off_r=y*X;
-        for(x=0;x<X;x++) {
-          arg=-2.0*M_PI*((1.0*u*x)/X+(1.0*v*y)/Y);
-          fourier->ftdata[off+u].r+=(cos(arg)*fourier->data[off_r+x].r-sin(arg)*fourier->data[off_r+x].i);
-          fourier->ftdata[off+u].i+=(sin(arg)*fourier->data[off_r+x].r+cos(arg)*fourier->data[off_r+x].i);
-        }
+        arg=-2.0*M_PI*v*y/Y;
+        off_r=off_f+y;
+        fourier->ftdata[off_f+v].r+=(cos(arg)*data[off_r].r-sin(arg)*data[off_r].i);
+        fourier->ftdata[off_f+v].r+=(sin(arg)*data[off_r].r+cos(arg)*data[off_r].i);
       }
-      fourier->ftdata[off_f+u].r/=(X*Y);
-      fourier->ftdata[off_f+u].i/=(X*Y);
+      fourier->ftdata[off_f+v].r/=Y;
+      fourier->ftdata[off_f+v].i/=Y;
     }
+    off_f+=Y;
   }
 
+  free(data);
+
   return F_SUCCESS;
 }