added 2d dft + bmp api (TESTING - may break!)

[my-code/api.git] / bmp / bmp.c

diff --git a/bmp/bmp.c b/bmp/bmp.c
new file mode 100644 (file)
index 0000000..2476140
--- /dev/null
+++ b/bmp/bmp.c
@@ -0,0 +1,141 @@
+/* bmp.c -- bmp write/read api
+ *
+ * author: hackbard@hackdaworld.dyndns.org
+ *
+ */
+
+#include "bmp.h"
+
+int bmp_init(t_bmp *bmp,int outfd) {
+
+  dprintf(outfd,"[bmp] initializing bmp api ...\n");
+
+  memset(bmp,0,sizeof(t_bmp));
+  bmp->outfd=outfd;
+
+  return B_SUCCESS;
+}
+
+int bmp_shutdown(t_bmp *bmp) {
+
+  if(bmp->map!=NULL) {
+    dprintf(bmp->outfd,"[bmp] free pixmap memory\n");
+    free(bmp->map);
+  }
+
+  dprintf(bmp->outfd,"[bmp] shutdown\n");
+
+  return B_SUCCESS;
+}
+
+int bmp_check_header_and_info(t_bmp *bmp) {
+
+  if(bmp->info.compression!=0) {
+    dprintf(bmp->outfd,"[bmp] compression not supported\n");
+    return B_NO_SUPPORT;
+  }
+  
+  if(bmp->info.bpp!=24) {
+    dprintf(bmp->outfd,"[bmp] only true color (24bpp) supported\n");
+    return B_NO_SUPPORT;
+  }
+    
+  if(bmp->hdr.offset!=B_H_SIZE+B_I_SIZE) {
+    dprintf(bmp->outfd,"[bmp] files with %d bytes offset not supported\n",
+            bmp->hdr-offset);
+    return B_NO_SUPPORT;
+  }
+
+  if(bmp->info.size!=BMP_I_SIZE) {
+    dprintf(bmp->outfd,"[bmp] files with %d bytes info size not supported\n",
+            bmp->info.size);
+    return B_NO_SUPPORT;
+  }
+    
+  return B_SUCCESS;
+}
+
+int bmp_write_file(t_bmp *bmp) {
+ 
+  int fill,xsize,size;
+
+  xsize=bmp->width*3;
+  fill=(4-(xsize%4))%4;
+  size=(xsize+fill)*bmp->height;
+
+  /* construct it */
+  bmp->hdr.identifier='B'|('M'<<8);
+  bmp->hdr.size=size+BMP_H_SIZE+BMP_I_SIZE;
+  bmp->hdr.offset=BMP_H_SIZE+BMP_I_SIZE;
+  bmp->info.size=BMP_I_SIZE;
+  bmp->info.width=bmp->width;
+  bmp->info.height=bmp->height;
+  bmp->info.planes=1;
+  bmp->info.bpp=24;
+  bmp->info.imagesize=size;
+  if(bmp->info.xres==0) bmp->info.xres=2048;
+  if(bmp->info.yres==0) bmp->info.yres=2048;
+  bmp->info.noc=0;
+  bmp->info.ic=0;
+
+  /* write it */
+  ...
+
+
+  return B_SUCCESS;
+}
+
+int bmp_read_file(t_bmp *bmp) {
+
+  unsigned char buf[BMP_HI_SIZE];
+  int y,xsize;
+  int crop;
+  unsigned char *data;
+
+  if(!(bmp->mode&READ)) {
+    dprintf(bmp->outfd,"[bmp] read mode not specified");
+    return B_NO_READ_MODE;
+  }
+
+  if((bmp->fd=open(bmp->file,O_RDONLY))<0) {
+    dprintf(bmp->outfd,"[bmp] unable to open file %s\n",bmp->file);
+    return B_NO_FILE;
+  }
+
+  if(read(bmp->fd,buf,BMP_H_SIZE+BMP_I_SIZE)<BMP_H_SIZE+BMP_I_SIZE) {
+    dprintf(bmp->outfd,"[bmp] error reading bmp header & info\n");
+    return B_NO_HI;
+  }
+
+  memcpy(&(bmp->hdr),buf,BMP_H_SIZE);
+  memcpy(&(bmp->info),buf+BMP_H_SIZE,BMP_I_SIZE);
+
+  if(bmp_check_header_and_info(bmp)!=B_SUCCESS) {
+    dprintf(bmp->outfd,"[bmp] header/info check failed\n");
+    return B_HI_FAIL;
+  }
+
+  bmp->map=(t_pixel *)malloc(bmp->info.width*bmp->info.height*sizeof(t_pixel));
+  if(bmp->map==NULL) {
+    dprintf(bmp->outfd,"[bmp] malloc of map memory failed\n");
+    return B_E_MEM;
+  }
+
+  crop=(bmp->info.imagesize/bmp->info.height)%4;
+  xsize=(bmp->info.bpp/8)*bmp->info.width;
+
+  for(y=0;y<bmp->info.height;y++) {
+    if(read(bmp->fd,bmp->map+y*bmp->info.width,xsize)<xsize) {
+      dprintf(bmp->outfd,"[bmp] reading image data of line %d failed\n",y);
+      return B_E_READ_DATA;
+    }
+    if(read(bmp->fd,buf,crop)<crop) {
+      dprintf(bmp->outfd,"[bmp] failed reading rest of line\n");
+      return B_E_READ_DATA;
+    }
+  }
+    
+  close(bmp->fd);
+
+  return B_SUCCESS;
+}