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Use bitfields to further reduce data structure size

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This commit is contained in:
Eric Fischer
2016-05-13 15:45:33 -07:00
parent f0e90620e4
commit 331deca4b4
3 changed files with 10 additions and 3 deletions
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CHANGELOG.md
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@@ -1,3 +1,7 @@
## 1.11.6
* Reduce the size of critical data structures to reduce dynamic memory use
## 1.11.5 ## 1.11.5
* Let zoom level 0 have just as much extent and buffer as any other zoom * Let zoom level 0 have just as much extent and buffer as any other zoom
geometry.hpp
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@@ -11,10 +11,13 @@
#define VT_NUMBER 2 #define VT_NUMBER 2
#define VT_BOOLEAN 7 #define VT_BOOLEAN 7
// The bitfield is to make sizeof(draw) be 16 instead of 24
// at the cost, apparently, of a 0.7% increase in running time
// for packing and unpacking.
struct draw { struct draw {
long long x; long long x : 40;
long long y;
signed char op; signed char op;
long long y : 40;
signed char necessary; signed char necessary;
draw(int nop, long long nx, long long ny) { draw(int nop, long long nx, long long ny) {
version.hpp
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@@ -1 +1 @@
#define VERSION "tippecanoe v1.11.5\n" #define VERSION "tippecanoe v1.11.6\n"