add pixman and libpngraylib

1 files changed, 1073 insertions, 0 deletions

diff --git a/libs/pixman-0.40.0/pixman/pixman-matrix.c b/libs/pixman-0.40.0/pixman/pixman-matrix.c
new file mode 100644
index 0000000..81b6e61
--- /dev/null
+++ b/libs/pixman-0.40.0/pixman/pixman-matrix.c
@@ -0,0 +1,1073 @@
+/*
+ * Copyright © 2008 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+/*
+ * Matrix interfaces
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <math.h>
+#include <string.h>
+#include "pixman-private.h"
+
+#define F(x)    pixman_int_to_fixed (x)
+
+static force_inline int
+count_leading_zeros (uint32_t x)
+{
+#ifdef HAVE_BUILTIN_CLZ
+    return __builtin_clz (x);
+#else
+    int n = 0;
+    while (x)
+    {
+        n++;
+        x >>= 1;
+    }
+    return 32 - n;
+#endif
+}
+
+/*
+ * Large signed/unsigned integer division with rounding for the platforms with
+ * only 64-bit integer data type supported (no 128-bit data type).
+ *
+ * Arguments:
+ *     hi, lo - high and low 64-bit parts of the dividend
+ *     div    - 48-bit divisor
+ *
+ * Returns: lowest 64 bits of the result as a return value and highest 64
+ *          bits of the result to "result_hi" pointer
+ */
+
+/* grade-school unsigned division (128-bit by 48-bit) with rounding to nearest */
+static force_inline uint64_t
+rounded_udiv_128_by_48 (uint64_t  hi,
+                        uint64_t  lo,
+                        uint64_t  div,
+                        uint64_t *result_hi)
+{
+    uint64_t tmp, remainder, result_lo;
+    assert(div < ((uint64_t)1 << 48));
+
+    remainder = hi % div;
+    *result_hi = hi / div;
+
+    tmp = (remainder << 16) + (lo >> 48);
+    result_lo = tmp / div;
+    remainder = tmp % div;
+
+    tmp = (remainder << 16) + ((lo >> 32) & 0xFFFF);
+    result_lo = (result_lo << 16) + (tmp / div);
+    remainder = tmp % div;
+
+    tmp = (remainder << 16) + ((lo >> 16) & 0xFFFF);
+    result_lo = (result_lo << 16) + (tmp / div);
+    remainder = tmp % div;
+
+    tmp = (remainder << 16) + (lo & 0xFFFF);
+    result_lo = (result_lo << 16) + (tmp / div);
+    remainder = tmp % div;
+
+    /* round to nearest */
+    if (remainder * 2 >= div && ++result_lo == 0)
+        *result_hi += 1;
+
+    return result_lo;
+}
+
+/* signed division (128-bit by 49-bit) with rounding to nearest */
+static inline int64_t
+rounded_sdiv_128_by_49 (int64_t   hi,
+                        uint64_t  lo,
+                        int64_t   div,
+                        int64_t  *signed_result_hi)
+{
+    uint64_t result_lo, result_hi;
+    int sign = 0;
+    if (div < 0)
+    {
+        div = -div;
+        sign ^= 1;
+    }
+    if (hi < 0)
+    {
+        if (lo != 0)
+            hi++;
+        hi = -hi;
+        lo = -lo;
+        sign ^= 1;
+    }
+    result_lo = rounded_udiv_128_by_48 (hi, lo, div, &result_hi);
+    if (sign)
+    {
+        if (result_lo != 0)
+            result_hi++;
+        result_hi = -result_hi;
+        result_lo = -result_lo;
+    }
+    if (signed_result_hi)
+    {
+        *signed_result_hi = result_hi;
+    }
+    return result_lo;
+}
+
+/*
+ * Multiply 64.16 fixed point value by (2^scalebits) and convert
+ * to 128-bit integer.
+ */
+static force_inline void
+fixed_64_16_to_int128 (int64_t  hi,
+                       int64_t  lo,
+                       int64_t *rhi,
+                       int64_t *rlo,
+                       int      scalebits)
+{
+    /* separate integer and fractional parts */
+    hi += lo >> 16;
+    lo &= 0xFFFF;
+
+    if (scalebits <= 0)
+    {
+        *rlo = hi >> (-scalebits);
+        *rhi = *rlo >> 63;
+    }
+    else
+    {
+        *rhi = hi >> (64 - scalebits);
+        *rlo = (uint64_t)hi << scalebits;
+        if (scalebits < 16)
+            *rlo += lo >> (16 - scalebits);
+        else
+            *rlo += lo << (scalebits - 16);
+    }
+}
+
+/*
+ * Convert 112.16 fixed point value to 48.16 with clamping for the out
+ * of range values.
+ */
+static force_inline pixman_fixed_48_16_t
+fixed_112_16_to_fixed_48_16 (int64_t hi, int64_t lo, pixman_bool_t *clampflag)
+{
+    if ((lo >> 63) != hi)
+    {
+        *clampflag = TRUE;
+        return hi >= 0 ? INT64_MAX : INT64_MIN;
+    }
+    else
+    {
+        return lo;
+    }
+}
+
+/*
+ * Transform a point with 31.16 fixed point coordinates from the destination
+ * space to a point with 48.16 fixed point coordinates in the source space.
+ * No overflows are possible for affine transformations and the results are
+ * accurate including the least significant bit. Projective transformations
+ * may overflow, in this case the results are just clamped to return maximum
+ * or minimum 48.16 values (so that the caller can at least handle the NONE
+ * and PAD repeats correctly) and the return value is FALSE to indicate that
+ * such clamping has happened.
+ */
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_point_31_16 (const pixman_transform_t    *t,
+                              const pixman_vector_48_16_t *v,
+                              pixman_vector_48_16_t       *result)
+{
+    pixman_bool_t clampflag = FALSE;
+    int i;
+    int64_t tmp[3][2], divint;
+    uint16_t divfrac;
+
+    /* input vector values must have no more than 31 bits (including sign)
+     * in the integer part */
+    assert (v->v[0] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[0] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[1] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[1] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[2] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[2] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+
+    for (i = 0; i < 3; i++)
+    {
+        tmp[i][0] = (int64_t)t->matrix[i][0] * (v->v[0] >> 16);
+        tmp[i][1] = (int64_t)t->matrix[i][0] * (v->v[0] & 0xFFFF);
+        tmp[i][0] += (int64_t)t->matrix[i][1] * (v->v[1] >> 16);
+        tmp[i][1] += (int64_t)t->matrix[i][1] * (v->v[1] & 0xFFFF);
+        tmp[i][0] += (int64_t)t->matrix[i][2] * (v->v[2] >> 16);
+        tmp[i][1] += (int64_t)t->matrix[i][2] * (v->v[2] & 0xFFFF);
+    }
+
+    /*
+     * separate 64-bit integer and 16-bit fractional parts for the divisor,
+     * which is also scaled by 65536 after fixed point multiplication.
+     */
+    divint  = tmp[2][0] + (tmp[2][1] >> 16);
+    divfrac = tmp[2][1] & 0xFFFF;
+
+    if (divint == pixman_fixed_1 && divfrac == 0)
+    {
+        /*
+         * this is a simple affine transformation
+         */
+        result->v[0] = tmp[0][0] + ((tmp[0][1] + 0x8000) >> 16);
+        result->v[1] = tmp[1][0] + ((tmp[1][1] + 0x8000) >> 16);
+        result->v[2] = pixman_fixed_1;
+    }
+    else if (divint == 0 && divfrac == 0)
+    {
+        /*
+         * handle zero divisor (if the values are non-zero, set the
+         * results to maximum positive or minimum negative)
+         */
+        clampflag = TRUE;
+
+        result->v[0] = tmp[0][0] + ((tmp[0][1] + 0x8000) >> 16);
+        result->v[1] = tmp[1][0] + ((tmp[1][1] + 0x8000) >> 16);
+
+        if (result->v[0] > 0)
+            result->v[0] = INT64_MAX;
+        else if (result->v[0] < 0)
+            result->v[0] = INT64_MIN;
+
+        if (result->v[1] > 0)
+            result->v[1] = INT64_MAX;
+        else if (result->v[1] < 0)
+            result->v[1] = INT64_MIN;
+    }
+    else
+    {
+        /*
+         * projective transformation, analyze the top 32 bits of the divisor
+         */
+        int32_t hi32divbits = divint >> 32;
+        if (hi32divbits < 0)
+            hi32divbits = ~hi32divbits;
+
+        if (hi32divbits == 0)
+        {
+            /* the divisor is small, we can actually keep all the bits */
+            int64_t hi, rhi, lo, rlo;
+            int64_t div = ((uint64_t)divint << 16) + divfrac;
+
+            fixed_64_16_to_int128 (tmp[0][0], tmp[0][1], &hi, &lo, 32);
+            rlo = rounded_sdiv_128_by_49 (hi, lo, div, &rhi);
+            result->v[0] = fixed_112_16_to_fixed_48_16 (rhi, rlo, &clampflag);
+
+            fixed_64_16_to_int128 (tmp[1][0], tmp[1][1], &hi, &lo, 32);
+            rlo = rounded_sdiv_128_by_49 (hi, lo, div, &rhi);
+            result->v[1] = fixed_112_16_to_fixed_48_16 (rhi, rlo, &clampflag);
+        }
+        else
+        {
+            /* the divisor needs to be reduced to 48 bits */
+            int64_t hi, rhi, lo, rlo, div;
+            int shift = 32 - count_leading_zeros (hi32divbits);
+            fixed_64_16_to_int128 (divint, divfrac, &hi, &div, 16 - shift);
+
+            fixed_64_16_to_int128 (tmp[0][0], tmp[0][1], &hi, &lo, 32 - shift);
+            rlo = rounded_sdiv_128_by_49 (hi, lo, div, &rhi);
+            result->v[0] = fixed_112_16_to_fixed_48_16 (rhi, rlo, &clampflag);
+
+            fixed_64_16_to_int128 (tmp[1][0], tmp[1][1], &hi, &lo, 32 - shift);
+            rlo = rounded_sdiv_128_by_49 (hi, lo, div, &rhi);
+            result->v[1] = fixed_112_16_to_fixed_48_16 (rhi, rlo, &clampflag);
+        }
+    }
+    result->v[2] = pixman_fixed_1;
+    return !clampflag;
+}
+
+PIXMAN_EXPORT void
+pixman_transform_point_31_16_affine (const pixman_transform_t    *t,
+                                     const pixman_vector_48_16_t *v,
+                                     pixman_vector_48_16_t       *result)
+{
+    int64_t hi0, lo0, hi1, lo1;
+
+    /* input vector values must have no more than 31 bits (including sign)
+     * in the integer part */
+    assert (v->v[0] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[0] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[1] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[1] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+
+    hi0  = (int64_t)t->matrix[0][0] * (v->v[0] >> 16);
+    lo0  = (int64_t)t->matrix[0][0] * (v->v[0] & 0xFFFF);
+    hi0 += (int64_t)t->matrix[0][1] * (v->v[1] >> 16);
+    lo0 += (int64_t)t->matrix[0][1] * (v->v[1] & 0xFFFF);
+    hi0 += (int64_t)t->matrix[0][2];
+
+    hi1  = (int64_t)t->matrix[1][0] * (v->v[0] >> 16);
+    lo1  = (int64_t)t->matrix[1][0] * (v->v[0] & 0xFFFF);
+    hi1 += (int64_t)t->matrix[1][1] * (v->v[1] >> 16);
+    lo1 += (int64_t)t->matrix[1][1] * (v->v[1] & 0xFFFF);
+    hi1 += (int64_t)t->matrix[1][2];
+
+    result->v[0] = hi0 + ((lo0 + 0x8000) >> 16);
+    result->v[1] = hi1 + ((lo1 + 0x8000) >> 16);
+    result->v[2] = pixman_fixed_1;
+}
+
+PIXMAN_EXPORT void
+pixman_transform_point_31_16_3d (const pixman_transform_t    *t,
+                                 const pixman_vector_48_16_t *v,
+                                 pixman_vector_48_16_t       *result)
+{
+    int i;
+    int64_t tmp[3][2];
+
+    /* input vector values must have no more than 31 bits (including sign)
+     * in the integer part */
+    assert (v->v[0] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[0] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[1] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[1] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[2] <   ((pixman_fixed_48_16_t)1 << (30 + 16)));
+    assert (v->v[2] >= -((pixman_fixed_48_16_t)1 << (30 + 16)));
+
+    for (i = 0; i < 3; i++)
+    {
+        tmp[i][0] = (int64_t)t->matrix[i][0] * (v->v[0] >> 16);
+        tmp[i][1] = (int64_t)t->matrix[i][0] * (v->v[0] & 0xFFFF);
+        tmp[i][0] += (int64_t)t->matrix[i][1] * (v->v[1] >> 16);
+        tmp[i][1] += (int64_t)t->matrix[i][1] * (v->v[1] & 0xFFFF);
+        tmp[i][0] += (int64_t)t->matrix[i][2] * (v->v[2] >> 16);
+        tmp[i][1] += (int64_t)t->matrix[i][2] * (v->v[2] & 0xFFFF);
+    }
+
+    result->v[0] = tmp[0][0] + ((tmp[0][1] + 0x8000) >> 16);
+    result->v[1] = tmp[1][0] + ((tmp[1][1] + 0x8000) >> 16);
+    result->v[2] = tmp[2][0] + ((tmp[2][1] + 0x8000) >> 16);
+}
+
+PIXMAN_EXPORT void
+pixman_transform_init_identity (struct pixman_transform *matrix)
+{
+    int i;
+
+    memset (matrix, '\0', sizeof (struct pixman_transform));
+    for (i = 0; i < 3; i++)
+	matrix->matrix[i][i] = F (1);
+}
+
+typedef pixman_fixed_32_32_t pixman_fixed_34_30_t;
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_point_3d (const struct pixman_transform *transform,
+                           struct pixman_vector *         vector)
+{
+    pixman_vector_48_16_t tmp;
+    tmp.v[0] = vector->vector[0];
+    tmp.v[1] = vector->vector[1];
+    tmp.v[2] = vector->vector[2];
+
+    pixman_transform_point_31_16_3d (transform, &tmp, &tmp);
+
+    vector->vector[0] = tmp.v[0];
+    vector->vector[1] = tmp.v[1];
+    vector->vector[2] = tmp.v[2];
+
+    return vector->vector[0] == tmp.v[0] &&
+           vector->vector[1] == tmp.v[1] &&
+           vector->vector[2] == tmp.v[2];
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_point (const struct pixman_transform *transform,
+                        struct pixman_vector *         vector)
+{
+    pixman_vector_48_16_t tmp;
+    tmp.v[0] = vector->vector[0];
+    tmp.v[1] = vector->vector[1];
+    tmp.v[2] = vector->vector[2];
+
+    if (!pixman_transform_point_31_16 (transform, &tmp, &tmp))
+        return FALSE;
+
+    vector->vector[0] = tmp.v[0];
+    vector->vector[1] = tmp.v[1];
+    vector->vector[2] = tmp.v[2];
+
+    return vector->vector[0] == tmp.v[0] &&
+           vector->vector[1] == tmp.v[1] &&
+           vector->vector[2] == tmp.v[2];
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_multiply (struct pixman_transform *      dst,
+                           const struct pixman_transform *l,
+                           const struct pixman_transform *r)
+{
+    struct pixman_transform d;
+    int dx, dy;
+    int o;
+
+    for (dy = 0; dy < 3; dy++)
+    {
+	for (dx = 0; dx < 3; dx++)
+	{
+	    pixman_fixed_48_16_t v;
+	    pixman_fixed_32_32_t partial;
+	    
+	    v = 0;
+	    for (o = 0; o < 3; o++)
+	    {
+		partial =
+		    (pixman_fixed_32_32_t) l->matrix[dy][o] *
+		    (pixman_fixed_32_32_t) r->matrix[o][dx];
+
+		v += (partial + 0x8000) >> 16;
+	    }
+
+	    if (v > pixman_max_fixed_48_16 || v < pixman_min_fixed_48_16)
+		return FALSE;
+	    
+	    d.matrix[dy][dx] = (pixman_fixed_t) v;
+	}
+    }
+
+    *dst = d;
+    return TRUE;
+}
+
+PIXMAN_EXPORT void
+pixman_transform_init_scale (struct pixman_transform *t,
+                             pixman_fixed_t           sx,
+                             pixman_fixed_t           sy)
+{
+    memset (t, '\0', sizeof (struct pixman_transform));
+
+    t->matrix[0][0] = sx;
+    t->matrix[1][1] = sy;
+    t->matrix[2][2] = F (1);
+}
+
+static pixman_fixed_t
+fixed_inverse (pixman_fixed_t x)
+{
+    return (pixman_fixed_t) ((((pixman_fixed_48_16_t) F (1)) * F (1)) / x);
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_scale (struct pixman_transform *forward,
+                        struct pixman_transform *reverse,
+                        pixman_fixed_t           sx,
+                        pixman_fixed_t           sy)
+{
+    struct pixman_transform t;
+
+    if (sx == 0 || sy == 0)
+	return FALSE;
+
+    if (forward)
+    {
+	pixman_transform_init_scale (&t, sx, sy);
+	if (!pixman_transform_multiply (forward, &t, forward))
+	    return FALSE;
+    }
+    
+    if (reverse)
+    {
+	pixman_transform_init_scale (&t, fixed_inverse (sx),
+	                             fixed_inverse (sy));
+	if (!pixman_transform_multiply (reverse, reverse, &t))
+	    return FALSE;
+    }
+    
+    return TRUE;
+}
+
+PIXMAN_EXPORT void
+pixman_transform_init_rotate (struct pixman_transform *t,
+                              pixman_fixed_t           c,
+                              pixman_fixed_t           s)
+{
+    memset (t, '\0', sizeof (struct pixman_transform));
+
+    t->matrix[0][0] = c;
+    t->matrix[0][1] = -s;
+    t->matrix[1][0] = s;
+    t->matrix[1][1] = c;
+    t->matrix[2][2] = F (1);
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_rotate (struct pixman_transform *forward,
+                         struct pixman_transform *reverse,
+                         pixman_fixed_t           c,
+                         pixman_fixed_t           s)
+{
+    struct pixman_transform t;
+
+    if (forward)
+    {
+	pixman_transform_init_rotate (&t, c, s);
+	if (!pixman_transform_multiply (forward, &t, forward))
+	    return FALSE;
+    }
+
+    if (reverse)
+    {
+	pixman_transform_init_rotate (&t, c, -s);
+	if (!pixman_transform_multiply (reverse, reverse, &t))
+	    return FALSE;
+    }
+    
+    return TRUE;
+}
+
+PIXMAN_EXPORT void
+pixman_transform_init_translate (struct pixman_transform *t,
+                                 pixman_fixed_t           tx,
+                                 pixman_fixed_t           ty)
+{
+    memset (t, '\0', sizeof (struct pixman_transform));
+
+    t->matrix[0][0] = F (1);
+    t->matrix[0][2] = tx;
+    t->matrix[1][1] = F (1);
+    t->matrix[1][2] = ty;
+    t->matrix[2][2] = F (1);
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_translate (struct pixman_transform *forward,
+                            struct pixman_transform *reverse,
+                            pixman_fixed_t           tx,
+                            pixman_fixed_t           ty)
+{
+    struct pixman_transform t;
+
+    if (forward)
+    {
+	pixman_transform_init_translate (&t, tx, ty);
+
+	if (!pixman_transform_multiply (forward, &t, forward))
+	    return FALSE;
+    }
+
+    if (reverse)
+    {
+	pixman_transform_init_translate (&t, -tx, -ty);
+
+	if (!pixman_transform_multiply (reverse, reverse, &t))
+	    return FALSE;
+    }
+    return TRUE;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_bounds (const struct pixman_transform *matrix,
+                         struct pixman_box16 *          b)
+
+{
+    struct pixman_vector v[4];
+    int i;
+    int x1, y1, x2, y2;
+
+    v[0].vector[0] = F (b->x1);
+    v[0].vector[1] = F (b->y1);
+    v[0].vector[2] = F (1);
+
+    v[1].vector[0] = F (b->x2);
+    v[1].vector[1] = F (b->y1);
+    v[1].vector[2] = F (1);
+
+    v[2].vector[0] = F (b->x2);
+    v[2].vector[1] = F (b->y2);
+    v[2].vector[2] = F (1);
+
+    v[3].vector[0] = F (b->x1);
+    v[3].vector[1] = F (b->y2);
+    v[3].vector[2] = F (1);
+
+    for (i = 0; i < 4; i++)
+    {
+	if (!pixman_transform_point (matrix, &v[i]))
+	    return FALSE;
+
+	x1 = pixman_fixed_to_int (v[i].vector[0]);
+	y1 = pixman_fixed_to_int (v[i].vector[1]);
+	x2 = pixman_fixed_to_int (pixman_fixed_ceil (v[i].vector[0]));
+	y2 = pixman_fixed_to_int (pixman_fixed_ceil (v[i].vector[1]));
+
+	if (i == 0)
+	{
+	    b->x1 = x1;
+	    b->y1 = y1;
+	    b->x2 = x2;
+	    b->y2 = y2;
+	}
+	else
+	{
+	    if (x1 < b->x1) b->x1 = x1;
+	    if (y1 < b->y1) b->y1 = y1;
+	    if (x2 > b->x2) b->x2 = x2;
+	    if (y2 > b->y2) b->y2 = y2;
+	}
+    }
+
+    return TRUE;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_invert (struct pixman_transform *      dst,
+                         const struct pixman_transform *src)
+{
+    struct pixman_f_transform m;
+
+    pixman_f_transform_from_pixman_transform (&m, src);
+
+    if (!pixman_f_transform_invert (&m, &m))
+	return FALSE;
+
+    if (!pixman_transform_from_pixman_f_transform (dst, &m))
+	return FALSE;
+
+    return TRUE;
+}
+
+static pixman_bool_t
+within_epsilon (pixman_fixed_t a,
+                pixman_fixed_t b,
+                pixman_fixed_t epsilon)
+{
+    pixman_fixed_t t = a - b;
+
+    if (t < 0)
+	t = -t;
+
+    return t <= epsilon;
+}
+
+#define EPSILON (pixman_fixed_t) (2)
+
+#define IS_SAME(a, b) (within_epsilon (a, b, EPSILON))
+#define IS_ZERO(a)    (within_epsilon (a, 0, EPSILON))
+#define IS_ONE(a)     (within_epsilon (a, F (1), EPSILON))
+#define IS_UNIT(a)			    \
+    (within_epsilon (a, F (1), EPSILON) ||  \
+     within_epsilon (a, F (-1), EPSILON) || \
+     IS_ZERO (a))
+#define IS_INT(a)    (IS_ZERO (pixman_fixed_frac (a)))
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_is_identity (const struct pixman_transform *t)
+{
+    return (IS_SAME (t->matrix[0][0], t->matrix[1][1]) &&
+	    IS_SAME (t->matrix[0][0], t->matrix[2][2]) &&
+	    !IS_ZERO (t->matrix[0][0]) &&
+	    IS_ZERO (t->matrix[0][1]) &&
+	    IS_ZERO (t->matrix[0][2]) &&
+	    IS_ZERO (t->matrix[1][0]) &&
+	    IS_ZERO (t->matrix[1][2]) &&
+	    IS_ZERO (t->matrix[2][0]) &&
+	    IS_ZERO (t->matrix[2][1]));
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_is_scale (const struct pixman_transform *t)
+{
+    return (!IS_ZERO (t->matrix[0][0]) &&
+            IS_ZERO (t->matrix[0][1]) &&
+            IS_ZERO (t->matrix[0][2]) &&
+
+            IS_ZERO (t->matrix[1][0]) &&
+            !IS_ZERO (t->matrix[1][1]) &&
+            IS_ZERO (t->matrix[1][2]) &&
+
+            IS_ZERO (t->matrix[2][0]) &&
+            IS_ZERO (t->matrix[2][1]) &&
+            !IS_ZERO (t->matrix[2][2]));
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_is_int_translate (const struct pixman_transform *t)
+{
+    return (IS_ONE (t->matrix[0][0]) &&
+            IS_ZERO (t->matrix[0][1]) &&
+            IS_INT (t->matrix[0][2]) &&
+
+            IS_ZERO (t->matrix[1][0]) &&
+            IS_ONE (t->matrix[1][1]) &&
+            IS_INT (t->matrix[1][2]) &&
+
+            IS_ZERO (t->matrix[2][0]) &&
+            IS_ZERO (t->matrix[2][1]) &&
+            IS_ONE (t->matrix[2][2]));
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_is_inverse (const struct pixman_transform *a,
+                             const struct pixman_transform *b)
+{
+    struct pixman_transform t;
+
+    if (!pixman_transform_multiply (&t, a, b))
+	return FALSE;
+
+    return pixman_transform_is_identity (&t);
+}
+
+PIXMAN_EXPORT void
+pixman_f_transform_from_pixman_transform (struct pixman_f_transform *    ft,
+                                          const struct pixman_transform *t)
+{
+    int i, j;
+
+    for (j = 0; j < 3; j++)
+    {
+	for (i = 0; i < 3; i++)
+	    ft->m[j][i] = pixman_fixed_to_double (t->matrix[j][i]);
+    }
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_transform_from_pixman_f_transform (struct pixman_transform *        t,
+                                          const struct pixman_f_transform *ft)
+{
+    int i, j;
+
+    for (j = 0; j < 3; j++)
+    {
+	for (i = 0; i < 3; i++)
+	{
+	    double d = ft->m[j][i];
+	    if (d < -32767.0 || d > 32767.0)
+		return FALSE;
+	    d = d * 65536.0 + 0.5;
+	    t->matrix[j][i] = (pixman_fixed_t) floor (d);
+	}
+    }
+    
+    return TRUE;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_f_transform_invert (struct pixman_f_transform *      dst,
+                           const struct pixman_f_transform *src)
+{
+    static const int a[3] = { 2, 2, 1 };
+    static const int b[3] = { 1, 0, 0 };
+    pixman_f_transform_t d;
+    double det;
+    int i, j;
+
+    det = 0;
+    for (i = 0; i < 3; i++)
+    {
+	double p;
+	int ai = a[i];
+	int bi = b[i];
+	p = src->m[i][0] * (src->m[ai][2] * src->m[bi][1] -
+	                    src->m[ai][1] * src->m[bi][2]);
+	if (i == 1)
+	    p = -p;
+	det += p;
+    }
+    
+    if (det == 0)
+	return FALSE;
+    
+    det = 1 / det;
+    for (j = 0; j < 3; j++)
+    {
+	for (i = 0; i < 3; i++)
+	{
+	    double p;
+	    int ai = a[i];
+	    int aj = a[j];
+	    int bi = b[i];
+	    int bj = b[j];
+
+	    p = (src->m[ai][aj] * src->m[bi][bj] -
+	         src->m[ai][bj] * src->m[bi][aj]);
+	    
+	    if (((i + j) & 1) != 0)
+		p = -p;
+	    
+	    d.m[j][i] = det * p;
+	}
+    }
+
+    *dst = d;
+
+    return TRUE;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_f_transform_point (const struct pixman_f_transform *t,
+                          struct pixman_f_vector *         v)
+{
+    struct pixman_f_vector result;
+    int i, j;
+    double a;
+
+    for (j = 0; j < 3; j++)
+    {
+	a = 0;
+	for (i = 0; i < 3; i++)
+	    a += t->m[j][i] * v->v[i];
+	result.v[j] = a;
+    }
+    
+    if (!result.v[2])
+	return FALSE;
+
+    for (j = 0; j < 2; j++)
+	v->v[j] = result.v[j] / result.v[2];
+
+    v->v[2] = 1;
+
+    return TRUE;
+}
+
+PIXMAN_EXPORT void
+pixman_f_transform_point_3d (const struct pixman_f_transform *t,
+                             struct pixman_f_vector *         v)
+{
+    struct pixman_f_vector result;
+    int i, j;
+    double a;
+
+    for (j = 0; j < 3; j++)
+    {
+	a = 0;
+	for (i = 0; i < 3; i++)
+	    a += t->m[j][i] * v->v[i];
+	result.v[j] = a;
+    }
+    
+    *v = result;
+}
+
+PIXMAN_EXPORT void
+pixman_f_transform_multiply (struct pixman_f_transform *      dst,
+                             const struct pixman_f_transform *l,
+                             const struct pixman_f_transform *r)
+{
+    struct pixman_f_transform d;
+    int dx, dy;
+    int o;
+
+    for (dy = 0; dy < 3; dy++)
+    {
+	for (dx = 0; dx < 3; dx++)
+	{
+	    double v = 0;
+	    for (o = 0; o < 3; o++)
+		v += l->m[dy][o] * r->m[o][dx];
+	    d.m[dy][dx] = v;
+	}
+    }
+    
+    *dst = d;
+}
+
+PIXMAN_EXPORT void
+pixman_f_transform_init_scale (struct pixman_f_transform *t,
+                               double                     sx,
+                               double                     sy)
+{
+    t->m[0][0] = sx;
+    t->m[0][1] = 0;
+    t->m[0][2] = 0;
+    t->m[1][0] = 0;
+    t->m[1][1] = sy;
+    t->m[1][2] = 0;
+    t->m[2][0] = 0;
+    t->m[2][1] = 0;
+    t->m[2][2] = 1;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_f_transform_scale (struct pixman_f_transform *forward,
+                          struct pixman_f_transform *reverse,
+                          double                     sx,
+                          double                     sy)
+{
+    struct pixman_f_transform t;
+
+    if (sx == 0 || sy == 0)
+	return FALSE;
+
+    if (forward)
+    {
+	pixman_f_transform_init_scale (&t, sx, sy);
+	pixman_f_transform_multiply (forward, &t, forward);
+    }
+    
+    if (reverse)
+    {
+	pixman_f_transform_init_scale (&t, 1 / sx, 1 / sy);
+	pixman_f_transform_multiply (reverse, reverse, &t);
+    }
+    
+    return TRUE;
+}
+
+PIXMAN_EXPORT void
+pixman_f_transform_init_rotate (struct pixman_f_transform *t,
+                                double                     c,
+                                double                     s)
+{
+    t->m[0][0] = c;
+    t->m[0][1] = -s;
+    t->m[0][2] = 0;
+    t->m[1][0] = s;
+    t->m[1][1] = c;
+    t->m[1][2] = 0;
+    t->m[2][0] = 0;
+    t->m[2][1] = 0;
+    t->m[2][2] = 1;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_f_transform_rotate (struct pixman_f_transform *forward,
+                           struct pixman_f_transform *reverse,
+                           double                     c,
+                           double                     s)
+{
+    struct pixman_f_transform t;
+
+    if (forward)
+    {
+	pixman_f_transform_init_rotate (&t, c, s);
+	pixman_f_transform_multiply (forward, &t, forward);
+    }
+    
+    if (reverse)
+    {
+	pixman_f_transform_init_rotate (&t, c, -s);
+	pixman_f_transform_multiply (reverse, reverse, &t);
+    }
+
+    return TRUE;
+}
+
+PIXMAN_EXPORT void
+pixman_f_transform_init_translate (struct pixman_f_transform *t,
+                                   double                     tx,
+                                   double                     ty)
+{
+    t->m[0][0] = 1;
+    t->m[0][1] = 0;
+    t->m[0][2] = tx;
+    t->m[1][0] = 0;
+    t->m[1][1] = 1;
+    t->m[1][2] = ty;
+    t->m[2][0] = 0;
+    t->m[2][1] = 0;
+    t->m[2][2] = 1;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_f_transform_translate (struct pixman_f_transform *forward,
+                              struct pixman_f_transform *reverse,
+                              double                     tx,
+                              double                     ty)
+{
+    struct pixman_f_transform t;
+
+    if (forward)
+    {
+	pixman_f_transform_init_translate (&t, tx, ty);
+	pixman_f_transform_multiply (forward, &t, forward);
+    }
+
+    if (reverse)
+    {
+	pixman_f_transform_init_translate (&t, -tx, -ty);
+	pixman_f_transform_multiply (reverse, reverse, &t);
+    }
+
+    return TRUE;
+}
+
+PIXMAN_EXPORT pixman_bool_t
+pixman_f_transform_bounds (const struct pixman_f_transform *t,
+                           struct pixman_box16 *            b)
+{
+    struct pixman_f_vector v[4];
+    int i;
+    int x1, y1, x2, y2;
+
+    v[0].v[0] = b->x1;
+    v[0].v[1] = b->y1;
+    v[0].v[2] = 1;
+    v[1].v[0] = b->x2;
+    v[1].v[1] = b->y1;
+    v[1].v[2] = 1;
+    v[2].v[0] = b->x2;
+    v[2].v[1] = b->y2;
+    v[2].v[2] = 1;
+    v[3].v[0] = b->x1;
+    v[3].v[1] = b->y2;
+    v[3].v[2] = 1;
+
+    for (i = 0; i < 4; i++)
+    {
+	if (!pixman_f_transform_point (t, &v[i]))
+	    return FALSE;
+
+	x1 = floor (v[i].v[0]);
+	y1 = floor (v[i].v[1]);
+	x2 = ceil (v[i].v[0]);
+	y2 = ceil (v[i].v[1]);
+
+	if (i == 0)
+	{
+	    b->x1 = x1;
+	    b->y1 = y1;
+	    b->x2 = x2;
+	    b->y2 = y2;
+	}
+	else
+	{
+	    if (x1 < b->x1) b->x1 = x1;
+	    if (y1 < b->y1) b->y1 = y1;
+	    if (x2 > b->x2) b->x2 = x2;
+	    if (y2 > b->y2) b->y2 = y2;
+	}
+    }
+
+    return TRUE;
+}
+
+PIXMAN_EXPORT void
+pixman_f_transform_init_identity (struct pixman_f_transform *t)
+{
+    int i, j;
+
+    for (j = 0; j < 3; j++)
+    {
+	for (i = 0; i < 3; i++)
+	    t->m[j][i] = i == j ? 1 : 0;
+    }
+}