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More docs added.

This commit is contained in:
Werner Lemberg 2000-01-07 15:02:05 +00:00
parent edfc0f8ac4
commit 2b94ffad74
1 changed files with 70 additions and 8 deletions
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78
src/base/ftcalc.c
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@ -35,6 +35,21 @@
#include <ftobjs.h> /* for ABS() */
/*************************************************************************/
/* */
/* <Function> */
/* FT_Sqrt32 */
/* */
/* <Description> */
/* Computes the square root of an Int32 integer (which will be */
/* as an unsigned long value). */
/* */
/* <Input> */
/* x :: The value to compute the root for. */
/* */
/* <Return> */
/* The result of `sqrt(x)'. */
/* */
BASE_FUNC
FT_Int32 FT_Sqrt32( FT_Int32 x )
{
@ -48,10 +63,10 @@
do
{
newroot = root + mask;
if (newroot <= val)
if ( newroot <= val )
{
val -= newroot;
root = newroot+mask;
root = newroot + mask;
}
root >>= 1;
@ -72,7 +87,7 @@
/* FT_MulDiv */
/* */
/* <Description> */
/* A very simple function used to perform the computation `(A*B)/C' */
/* A very simple function used to perform the computation `(a*b)/c' */
/* with maximum accuracy (it uses a 64-bit intermediate integer */
/* whenever necessary). */
/* */
@ -113,7 +128,7 @@
/* */
/* <Description> */
/* A very simple function used to perform the computation */
/* `(A*B)/0x10000' with maximum accuracy. Most of the time this is */
/* `(a*b)/0x10000' with maximum accuracy. Most of the time this is */
/* used to multiply a given value by a 16.16 fixed float factor. */
/* */
/* <Input> */
@ -157,7 +172,7 @@
/* */
/* <Description> */
/* A very simple function used to perform the computation */
/* `(A*0x10000)/B' with maximum accuracy. Most of the time, this is */
/* `(a*0x10000)/b' with maximum accuracy. Most of the time, this is */
/* used to divide a given value by a 16.16 fixed float factor. */
/* */
/* <Input> */
@ -205,7 +220,7 @@
/* FT_MulDiv */
/* */
/* <Description> */
/* A very simple function used to perform the computation `(A*B)/C' */
/* A very simple function used to perform the computation `(a*b)/c' */
/* with maximum accuracy (it uses a 64-bit intermediate integer */
/* whenever necessary). */
/* */
@ -281,7 +296,7 @@
/* */
/* <Description> */
/* A very simple function used to perform the computation */
/* `(A*B)/0x10000' with maximum accuracy. Most of the time, this is */
/* `(a*b)/0x10000' with maximum accuracy. Most of the time, this is */
/* used to multiply a given value by a 16.16 fixed float factor. */
/* */
/* <Input> */
@ -341,7 +356,7 @@
/* */
/* <Description> */
/* A very simple function used to perform the computation */
/* `(A*0x10000)/B' with maximum accuracy. Most of the time, this is */
/* `(a*0x10000)/b' with maximum accuracy. Most of the time, this is */
/* used to divide a given value by a 16.16 fixed float factor. */
/* */
/* <Input> */
@ -401,6 +416,21 @@
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Add64 */
/* */
/* <Description> */
/* Add two Int64 values. Will be wrapped by the ADD_64() macro. */
/* */
/* <Input> */
/* x :: A pointer to the first value to be added. */
/* y :: A pointer to the second value to be added. */
/* */
/* <InOut> */
/* z :: A pointer to the result of `x + y'. */
/* */
BASE_FUNC
void FT_Add64( FT_Int64* x,
FT_Int64* y,
@ -416,6 +446,22 @@
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_MulTo64 */
/* */
/* <Description> */
/* Multiplies two Int32 integers. Returns a Int64 integer. Will be */
/* wrapped by the MUL_64() macro. */
/* */
/* <Input> */
/* x :: The first multiplier. */
/* y :: The second multiplier. */
/* */
/* <InOut> */
/* z :: A pointer to the result of `x * y'. */
/* */
BASE_FUNC
void FT_MulTo64( FT_Int32 x,
FT_Int32 y,
@ -463,6 +509,22 @@
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Div64by32 */
/* */
/* <Description> */
/* Divides an Int64 value by an Int32 value. Returns an Int32 */
/* integer. Will be wrapped by the DIV_64() macro. */
/* */
/* <Input> */
/* x :: A pointer to the dividend. */
/* y :: The divisor. */
/* */
/* <Return> */
/* The result of `x / y'. */
/* */
BASE_FUNC
FT_Int32 FT_Div64by32( FT_Int64* x,
FT_Int32 y )