diff --git a/third_party/qcms/src/iccread.c b/third_party/qcms/src/iccread.c
index 36b7011..aca19d3 100644
--- a/third_party/qcms/src/iccread.c
+++ b/third_party/qcms/src/iccread.c
@@ -266,7 +266,7 @@ qcms_bool qcms_profile_is_bogus(qcms_profile *profile)
        if (profile->color_space != RGB_SIGNATURE)
 	       return false;
 
-       if (profile->A2B0 || profile->B2A0)
+       if (qcms_supports_iccv4 && (profile->A2B0 || profile->B2A0))
                return false;
 
        rX = s15Fixed16Number_to_float(profile->redColorant.X);
@@ -297,6 +297,11 @@ qcms_bool qcms_profile_is_bogus(qcms_profile *profile)
        sum[1] = rY + gY + bY;
        sum[2] = rZ + gZ + bZ;
 
+#if defined (_MSC_VER)
+#pragma warning(push)
+/* Disable double to float truncation warning 4305 */
+#pragma warning(disable:4305)
+#endif
        // Build our target vector (see mozilla bug 460629)
        target[0] = 0.96420;
        target[1] = 1.00000;
@@ -310,6 +315,10 @@ qcms_bool qcms_profile_is_bogus(qcms_profile *profile)
        tolerance[1] = 0.02;
        tolerance[2] = 0.04;
 
+#if defined (_MSC_VER)
+/* Restore warnings */
+#pragma warning(pop)
+#endif
        // Compare with our tolerance
        for (i = 0; i < 3; ++i) {
            if (!(((sum[i] - tolerance[i]) <= target[i]) &&
@@ -331,6 +340,7 @@ qcms_bool qcms_profile_is_bogus(qcms_profile *profile)
 #define TAG_A2B0 0x41324230
 #define TAG_B2A0 0x42324130
 #define TAG_CHAD 0x63686164
+#define TAG_desc 0x64657363
 
 static struct tag *find_tag(struct tag_index index, uint32_t tag_id)
 {
@@ -344,6 +354,47 @@ static struct tag *find_tag(struct tag_index index, uint32_t tag_id)
 	return tag;
 }
 
+#define DESC_TYPE 0x64657363 // 'desc'
+#define MLUC_TYPE 0x6d6c7563 // 'mluc'
+
+static bool read_tag_descType(qcms_profile *profile, struct mem_source *src, struct tag_index index, uint32_t tag_id)
+{
+	struct tag *tag = find_tag(index, tag_id);
+	if (tag) {
+		const uint32_t limit = sizeof profile->description;
+		uint32_t offset = tag->offset;
+		uint32_t type = read_u32(src, offset);
+		uint32_t length = read_u32(src, offset+8);
+		uint32_t i, description;
+		if (length && type == MLUC_TYPE) {
+			length = read_u32(src, offset+20);
+			if (!length || (length & 1) || (read_u32(src, offset+12) != 12))
+				goto invalid_desc_tag;
+			description = offset + read_u32(src, offset+24);
+			if (!src->valid)
+				goto invalid_desc_tag;
+		} else if (length && type == DESC_TYPE) {
+			description = offset + 12;
+		} else {
+			goto invalid_desc_tag;
+		}
+		if (length >= limit)
+			length = limit - 1;
+		for (i = 0; i < length; ++i)
+			profile->description[i] = read_u8(src, description+i);
+		profile->description[length] = 0;
+	} else {
+		goto invalid_desc_tag;
+	}
+
+	if (src->valid)
+		return true;
+
+invalid_desc_tag:
+	invalid_source(src, "invalid description");
+	return false;
+}
+
 #define XYZ_TYPE		0x58595a20 // 'XYZ '
 #define CURVE_TYPE		0x63757276 // 'curv'
 #define PARAMETRIC_CURVE_TYPE	0x70617261 // 'para'
@@ -402,7 +453,7 @@ static struct XYZNumber read_tag_XYZType(struct mem_source *src, struct tag_inde
 // present that are not part of the tag_index.
 static struct curveType *read_curveType(struct mem_source *src, uint32_t offset, uint32_t *len)
 {
-	static const size_t COUNT_TO_LENGTH[5] = {1, 3, 4, 5, 7};
+	static const uint32_t COUNT_TO_LENGTH[5] = {1, 3, 4, 5, 7};
 	struct curveType *curve = NULL;
 	uint32_t type = read_u32(src, offset);
 	uint32_t count;
@@ -484,19 +535,23 @@ static void read_nested_curveType(struct mem_source *src, struct curveType *(*cu
 	uint32_t channel_offset = 0;
 	int i;
 	for (i = 0; i < num_channels; i++) {
-		uint32_t tag_len;
+		uint32_t tag_len = ~0;
 
 		(*curveArray)[i] = read_curveType(src, curve_offset + channel_offset, &tag_len);
 		if (!(*curveArray)[i]) {
 			invalid_source(src, "invalid nested curveType curve");
 		}
 
+		if (tag_len == ~0) {
+			invalid_source(src, "invalid nested curveType tag length");
+			return;
+		}
+
 		channel_offset += tag_len;
 		// 4 byte aligned
 		if ((tag_len % 4) != 0)
 			channel_offset += 4 - (tag_len % 4);
 	}
-
 }
 
 static void mAB_release(struct lutmABType *lut)
@@ -657,7 +712,7 @@ static struct lutType *read_tag_lutType(struct mem_source *src, struct tag_index
 	uint16_t num_input_table_entries;
 	uint16_t num_output_table_entries;
 	uint8_t in_chan, grid_points, out_chan;
-	uint32_t clut_offset, output_offset;
+	size_t clut_offset, output_offset;
 	uint32_t clut_size;
 	size_t entry_size;
 	struct lutType *lut;
@@ -979,6 +1034,9 @@ qcms_profile* qcms_profile_sRGB(void)
 		return NO_MEM_PROFILE;
 
 	profile = qcms_profile_create_rgb_with_table(D65, Rec709Primaries, table, 1024);
+	if (profile)
+		strcpy(profile->description, "sRGB IEC61966-2.1");
+
 	free(table);
 	return profile;
 }
@@ -997,6 +1055,9 @@ qcms_profile* qcms_profile_from_memory(const void *mem, size_t size)
 	source.size = size;
 	source.valid = true;
 
+	if (size < 4)
+		return INVALID_PROFILE;
+
 	length = read_u32(src, 0);
 	if (length <= size) {
 		// shrink the area that we can read if appropriate
@@ -1028,6 +1089,9 @@ qcms_profile* qcms_profile_from_memory(const void *mem, size_t size)
 	if (!src->valid || !index.tags)
 		goto invalid_tag_table;
 
+	if (!read_tag_descType(profile, src, index, TAG_desc))
+		goto invalid_tag_table;
+
 	if (find_tag(index, TAG_CHAD)) {
 		profile->chromaticAdaption = read_tag_s15Fixed16ArrayType(src, index, TAG_CHAD);
 	} else {
@@ -1098,6 +1162,16 @@ invalid_profile:
 	return INVALID_PROFILE;
 }
 
+qcms_bool qcms_profile_match(qcms_profile *p1, qcms_profile *p2)
+{
+    return memcmp(p1->description, p2->description, sizeof p1->description) == 0;
+}
+
+const char* qcms_profile_get_description(qcms_profile *profile)
+{
+    return profile->description;
+}
+
 qcms_intent qcms_profile_get_rendering_intent(qcms_profile *profile)
 {
 	return profile->rendering_intent;
diff --git a/third_party/qcms/src/qcms.h b/third_party/qcms/src/qcms.h
index 7d83623..c69a772 100644
--- a/third_party/qcms/src/qcms.h
+++ b/third_party/qcms/src/qcms.h
@@ -40,6 +40,12 @@ sale, use or other dealings in this Software without written
 authorization from SunSoft Inc. 
 ******************************************************************/
 
+/*
+ * QCMS, in general, is not threadsafe. However, it should be safe to create
+ * profile and transformation objects on different threads, so long as you
+ * don't use the same objects on different threads at the same time.
+ */
+
 /* 
  * Color Space Signatures
  * Note that only icSigXYZData and icSigLabData are valid
@@ -102,6 +108,12 @@ typedef enum {
 	QCMS_DATA_GRAYA_8
 } qcms_data_type;
 
+/* Format of the output data for qcms_transform_data_type() */
+typedef enum {
+	QCMS_OUTPUT_RGBX,
+	QCMS_OUTPUT_BGRX
+} qcms_output_type;
+
 /* the names for the following two types are sort of ugly */
 typedef struct
 {
@@ -136,6 +148,9 @@ qcms_bool qcms_profile_is_bogus(qcms_profile *profile);
 qcms_intent qcms_profile_get_rendering_intent(qcms_profile *profile);
 icColorSpaceSignature qcms_profile_get_color_space(qcms_profile *profile);
 
+qcms_bool qcms_profile_match(qcms_profile *p1, qcms_profile *p2);
+const char* qcms_profile_get_description(qcms_profile *profile);
+
 void qcms_profile_precache_output_transform(qcms_profile *profile);
 
 qcms_transform* qcms_transform_create(
@@ -146,6 +161,7 @@ qcms_transform* qcms_transform_create(
 void qcms_transform_release(qcms_transform *);
 
 void qcms_transform_data(qcms_transform *transform, void *src, void *dest, size_t length);
+void qcms_transform_data_type(qcms_transform *transform, void *src, void *dest, size_t length, qcms_output_type type);
 
 void qcms_enable_iccv4();
 
diff --git a/third_party/qcms/src/qcmsint.h b/third_party/qcms/src/qcmsint.h
index 53a3420..4116ed5 100644
--- a/third_party/qcms/src/qcmsint.h
+++ b/third_party/qcms/src/qcmsint.h
@@ -45,6 +45,11 @@ struct precache_output
 #define ALIGN __attribute__(( aligned (16) ))
 #endif
 
+typedef struct _qcms_format_type {
+	int r;
+	int b;
+} qcms_format_type;
+
 struct _qcms_transform {
 	float ALIGN matrix[3][4];
 	float *input_gamma_table_r;
@@ -88,7 +93,7 @@ struct _qcms_transform {
 	struct precache_output *output_table_g;
 	struct precache_output *output_table_b;
 
-	void (*transform_fn)(struct _qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length);
+	void (*transform_fn)(struct _qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, struct _qcms_format_type output_format);
 };
 
 struct matrix {
@@ -225,6 +230,7 @@ struct tag_value {
 #define LAB_SIGNATURE  0x4C616220
 
 struct _qcms_profile {
+	char description[64];
 	uint32_t class;
 	uint32_t color_space;
 	uint32_t pcs;
@@ -280,18 +286,40 @@ qcms_bool set_rgb_colorants(qcms_profile *profile, qcms_CIE_xyY white_point, qcm
 void qcms_transform_data_rgb_out_lut_sse2(qcms_transform *transform,
                                           unsigned char *src,
                                           unsigned char *dest,
-                                          size_t length);
+                                          size_t length,
+                                          qcms_format_type output_format);
 void qcms_transform_data_rgba_out_lut_sse2(qcms_transform *transform,
                                           unsigned char *src,
                                           unsigned char *dest,
-                                          size_t length);
+                                          size_t length,
+                                          qcms_format_type output_format);
 void qcms_transform_data_rgb_out_lut_sse1(qcms_transform *transform,
                                           unsigned char *src,
                                           unsigned char *dest,
-                                          size_t length);
+                                          size_t length,
+                                          qcms_format_type output_format);
 void qcms_transform_data_rgba_out_lut_sse1(qcms_transform *transform,
                                           unsigned char *src,
                                           unsigned char *dest,
-                                          size_t length);
+                                          size_t length,
+                                          qcms_format_type output_format);
 
 extern qcms_bool qcms_supports_iccv4;
+
+
+#ifdef _MSC_VER
+
+long __cdecl _InterlockedIncrement(long volatile *);
+long __cdecl _InterlockedDecrement(long volatile *);
+#pragma intrinsic(_InterlockedIncrement)
+#pragma intrinsic(_InterlockedDecrement)
+
+#define qcms_atomic_increment(x) _InterlockedIncrement((long volatile *)&x)
+#define qcms_atomic_decrement(x) _InterlockedDecrement((long volatile*)&x)
+
+#else
+
+#define qcms_atomic_increment(x) __sync_add_and_fetch(&x, 1)
+#define qcms_atomic_decrement(x) __sync_sub_and_fetch(&x, 1)
+
+#endif
diff --git a/third_party/qcms/src/qcmstypes.h b/third_party/qcms/src/qcmstypes.h
index 56d8de3..d58f691 100644
--- a/third_party/qcms/src/qcmstypes.h
+++ b/third_party/qcms/src/qcmstypes.h
@@ -22,37 +22,6 @@
 #ifndef QCMS_TYPES_H
 #define QCMS_TYPES_H
 
-#ifdef MOZ_QCMS
-
-#include "prtypes.h"
-
-/* prtypes.h defines IS_LITTLE_ENDIAN and IS_BIG ENDIAN */
-
-#if defined (__SVR4) && defined (__sun)
-/* int_types.h gets included somehow, so avoid redefining the types differently */
-#include <sys/int_types.h>
-#elif defined (_AIX)
-#include <sys/types.h>
-#elif !defined(ANDROID) && !defined(__OpenBSD__)
-typedef PRInt8 int8_t;
-typedef PRUint8 uint8_t;
-typedef PRInt16 int16_t;
-typedef PRUint16 uint16_t;
-typedef PRInt32 int32_t;
-typedef PRUint32 uint32_t;
-typedef PRInt64 int64_t;
-typedef PRUint64 uint64_t;
-
-#ifdef __OS2__
-/* OS/2's stdlib typdefs uintptr_t. So we'll just include that so we don't collide */
-#include <stdlib.h>
-#elif !defined(__intptr_t_defined) && !defined(_UINTPTR_T_DEFINED)
-typedef PRUptrdiff uintptr_t;
-#endif
-#endif
-
-#else // MOZ_QCMS
-
 #if BYTE_ORDER == LITTLE_ENDIAN
 #define IS_LITTLE_ENDIAN
 #elif BYTE_ORDER == BIG_ENDIAN
@@ -75,7 +44,7 @@ typedef PRUptrdiff uintptr_t;
 
 #if defined (_SVR4) || defined (SVR4) || defined (__OpenBSD__) || defined (_sgi) || defined (__sun) || defined (sun) || defined (__digital__)
 #  include <inttypes.h>
-#elif defined (_MSC_VER)
+#elif defined (_MSC_VER) && _MSC_VER < 1600
 typedef __int8 int8_t;
 typedef unsigned __int8 uint8_t;
 typedef __int16 int16_t;
@@ -87,7 +56,12 @@ typedef unsigned __int64 uint64_t;
 #ifdef _WIN64
 typedef unsigned __int64 uintptr_t;
 #else
+#pragma warning(push)
+/* Disable benign redefinition of type warning 4142 */
+#pragma warning(disable:4142)
 typedef unsigned long uintptr_t;
+/* Restore warnings */
+#pragma warning(pop)
 #endif
 
 #elif defined (_AIX)
@@ -96,8 +70,6 @@ typedef unsigned long uintptr_t;
 #  include <stdint.h>
 #endif
 
-#endif
-
 typedef qcms_bool bool;
 #define true 1
 #define false 0
diff --git a/third_party/qcms/src/transform-sse1.c b/third_party/qcms/src/transform-sse1.c
index 2f34db5..aaee1bf 100644
--- a/third_party/qcms/src/transform-sse1.c
+++ b/third_party/qcms/src/transform-sse1.c
@@ -34,7 +34,8 @@ static const ALIGN float clampMaxValueX4[4] =
 void qcms_transform_data_rgb_out_lut_sse1(qcms_transform *transform,
                                           unsigned char *src,
                                           unsigned char *dest,
-                                          size_t length)
+                                          size_t length,
+                                          qcms_format_type output_format)
 {
     unsigned int i;
     float (*mat)[4] = transform->matrix;
@@ -70,6 +71,8 @@ void qcms_transform_data_rgb_out_lut_sse1(qcms_transform *transform,
 
     /* working variables */
     __m128 vec_r, vec_g, vec_b, result;
+    const int r_out = output_format.r;
+    const int b_out = output_format.b;
 
     /* CYA */
     if (!length)
@@ -116,9 +119,9 @@ void qcms_transform_data_rgb_out_lut_sse1(qcms_transform *transform,
         src += 3;
 
         /* use calc'd indices to output RGB values */
-        dest[0] = otdata_r[output[0]];
-        dest[1] = otdata_g[output[1]];
-        dest[2] = otdata_b[output[2]];
+        dest[r_out] = otdata_r[output[0]];
+        dest[1]     = otdata_g[output[1]];
+        dest[b_out] = otdata_b[output[2]];
         dest += 3;
     }
 
@@ -141,9 +144,9 @@ void qcms_transform_data_rgb_out_lut_sse1(qcms_transform *transform,
     result = _mm_movehl_ps(result, result);
     *((__m64 *)&output[2]) = _mm_cvtps_pi32(result);
 
-    dest[0] = otdata_r[output[0]];
-    dest[1] = otdata_g[output[1]];
-    dest[2] = otdata_b[output[2]];
+    dest[r_out] = otdata_r[output[0]];
+    dest[1]     = otdata_g[output[1]];
+    dest[b_out] = otdata_b[output[2]];
 
     _mm_empty();
 }
@@ -151,7 +154,8 @@ void qcms_transform_data_rgb_out_lut_sse1(qcms_transform *transform,
 void qcms_transform_data_rgba_out_lut_sse1(qcms_transform *transform,
                                            unsigned char *src,
                                            unsigned char *dest,
-                                           size_t length)
+                                           size_t length,
+                                           qcms_format_type output_format)
 {
     unsigned int i;
     float (*mat)[4] = transform->matrix;
@@ -187,6 +191,8 @@ void qcms_transform_data_rgba_out_lut_sse1(qcms_transform *transform,
 
     /* working variables */
     __m128 vec_r, vec_g, vec_b, result;
+    const int r_out = output_format.r;
+    const int b_out = output_format.b;
     unsigned char alpha;
 
     /* CYA */
@@ -239,9 +245,9 @@ void qcms_transform_data_rgba_out_lut_sse1(qcms_transform *transform,
         src += 4;
 
         /* use calc'd indices to output RGB values */
-        dest[0] = otdata_r[output[0]];
-        dest[1] = otdata_g[output[1]];
-        dest[2] = otdata_b[output[2]];
+        dest[r_out] = otdata_r[output[0]];
+        dest[1]     = otdata_g[output[1]];
+        dest[b_out] = otdata_b[output[2]];
         dest += 4;
     }
 
@@ -266,9 +272,9 @@ void qcms_transform_data_rgba_out_lut_sse1(qcms_transform *transform,
     result = _mm_movehl_ps(result, result);
     *((__m64 *)&output[2]) = _mm_cvtps_pi32(result);
 
-    dest[0] = otdata_r[output[0]];
-    dest[1] = otdata_g[output[1]];
-    dest[2] = otdata_b[output[2]];
+    dest[r_out] = otdata_r[output[0]];
+    dest[1]     = otdata_g[output[1]];
+    dest[b_out] = otdata_b[output[2]];
 
     _mm_empty();
 }
diff --git a/third_party/qcms/src/transform-sse2.c b/third_party/qcms/src/transform-sse2.c
index 6a5faf9..fa7f2d1 100644
--- a/third_party/qcms/src/transform-sse2.c
+++ b/third_party/qcms/src/transform-sse2.c
@@ -34,7 +34,8 @@ static const ALIGN float clampMaxValueX4[4] =
 void qcms_transform_data_rgb_out_lut_sse2(qcms_transform *transform,
                                           unsigned char *src,
                                           unsigned char *dest,
-                                          size_t length)
+                                          size_t length,
+                                          qcms_format_type output_format)
 {
     unsigned int i;
     float (*mat)[4] = transform->matrix;
@@ -70,6 +71,8 @@ void qcms_transform_data_rgb_out_lut_sse2(qcms_transform *transform,
 
     /* working variables */
     __m128 vec_r, vec_g, vec_b, result;
+    const int r_out = output_format.r;
+    const int b_out = output_format.b;
 
     /* CYA */
     if (!length)
@@ -114,9 +117,9 @@ void qcms_transform_data_rgb_out_lut_sse2(qcms_transform *transform,
         src += 3;
 
         /* use calc'd indices to output RGB values */
-        dest[0] = otdata_r[output[0]];
-        dest[1] = otdata_g[output[1]];
-        dest[2] = otdata_b[output[2]];
+        dest[r_out] = otdata_r[output[0]];
+        dest[1]     = otdata_g[output[1]];
+        dest[b_out] = otdata_b[output[2]];
         dest += 3;
     }
 
@@ -137,15 +140,16 @@ void qcms_transform_data_rgb_out_lut_sse2(qcms_transform *transform,
 
     _mm_store_si128((__m128i*)output, _mm_cvtps_epi32(result));
 
-    dest[0] = otdata_r[output[0]];
-    dest[1] = otdata_g[output[1]];
-    dest[2] = otdata_b[output[2]];
+    dest[r_out] = otdata_r[output[0]];
+    dest[1]     = otdata_g[output[1]];
+    dest[b_out] = otdata_b[output[2]];
 }
 
 void qcms_transform_data_rgba_out_lut_sse2(qcms_transform *transform,
                                            unsigned char *src,
                                            unsigned char *dest,
-                                           size_t length)
+                                           size_t length,
+                                           qcms_format_type output_format)
 {
     unsigned int i;
     float (*mat)[4] = transform->matrix;
@@ -181,6 +185,8 @@ void qcms_transform_data_rgba_out_lut_sse2(qcms_transform *transform,
 
     /* working variables */
     __m128 vec_r, vec_g, vec_b, result;
+    const int r_out = output_format.r;
+    const int b_out = output_format.b;
     unsigned char alpha;
 
     /* CYA */
@@ -231,9 +237,9 @@ void qcms_transform_data_rgba_out_lut_sse2(qcms_transform *transform,
         src += 4;
 
         /* use calc'd indices to output RGB values */
-        dest[0] = otdata_r[output[0]];
-        dest[1] = otdata_g[output[1]];
-        dest[2] = otdata_b[output[2]];
+        dest[r_out] = otdata_r[output[0]];
+        dest[1]     = otdata_g[output[1]];
+        dest[b_out] = otdata_b[output[2]];
         dest += 4;
     }
 
@@ -256,7 +262,7 @@ void qcms_transform_data_rgba_out_lut_sse2(qcms_transform *transform,
 
     _mm_store_si128((__m128i*)output, _mm_cvtps_epi32(result));
 
-    dest[0] = otdata_r[output[0]];
-    dest[1] = otdata_g[output[1]];
-    dest[2] = otdata_b[output[2]];
+    dest[r_out] = otdata_r[output[0]];
+    dest[1]     = otdata_g[output[1]];
+    dest[b_out] = otdata_b[output[2]];
 }
diff --git a/third_party/qcms/src/transform.c b/third_party/qcms/src/transform.c
index 9a6562b..08db142 100644
--- a/third_party/qcms/src/transform.c
+++ b/third_party/qcms/src/transform.c
@@ -181,11 +181,20 @@ compute_chromatic_adaption(struct CIE_XYZ source_white_point,
 static struct matrix
 adaption_matrix(struct CIE_XYZ source_illumination, struct CIE_XYZ target_illumination)
 {
+#if defined (_MSC_VER)
+#pragma warning(push)
+/* Disable double to float truncation warning 4305 */
+#pragma warning(disable:4305)
+#endif
 	struct matrix lam_rigg = {{ // Bradford matrix
 	                         {  0.8951,  0.2664, -0.1614 },
 	                         { -0.7502,  1.7135,  0.0367 },
 	                         {  0.0389, -0.0685,  1.0296 }
 	                         }};
+#if defined (_MSC_VER)
+/* Restore warnings */
+#pragma warning(pop)
+#endif
 	return compute_chromatic_adaption(source_illumination, target_illumination, lam_rigg);
 }
 
@@ -230,8 +239,11 @@ qcms_bool set_rgb_colorants(qcms_profile *profile, qcms_CIE_xyY white_point, qcm
 }
 
 #if 0
-static void qcms_transform_data_rgb_out_pow(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_rgb_out_pow(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	int i;
 	float (*mat)[4] = transform->matrix;
 	for (i=0; i<length; i++) {
@@ -251,15 +263,19 @@ static void qcms_transform_data_rgb_out_pow(qcms_transform *transform, unsigned
 		float out_device_g = pow(out_linear_g, transform->out_gamma_g);
 		float out_device_b = pow(out_linear_b, transform->out_gamma_b);
 
-		*dest++ = clamp_u8(255*out_device_r);
-		*dest++ = clamp_u8(255*out_device_g);
-		*dest++ = clamp_u8(255*out_device_b);
+		dest[r_out] = clamp_u8(out_device_r*255);
+		dest[1]     = clamp_u8(out_device_g*255);
+		dest[b_out] = clamp_u8(out_device_b*255);
+		dest += 3;
 	}
 }
 #endif
 
-static void qcms_transform_data_gray_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_gray_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	for (i = 0; i < length; i++) {
 		float out_device_r, out_device_g, out_device_b;
@@ -267,13 +283,14 @@ static void qcms_transform_data_gray_out_lut(qcms_transform *transform, unsigned
 
 		float linear = transform->input_gamma_table_gray[device];
 
-                out_device_r = lut_interp_linear(linear, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
+		out_device_r = lut_interp_linear(linear, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
 		out_device_g = lut_interp_linear(linear, transform->output_gamma_lut_g, transform->output_gamma_lut_g_length);
 		out_device_b = lut_interp_linear(linear, transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
 
-		*dest++ = clamp_u8(out_device_r*255);
-		*dest++ = clamp_u8(out_device_g*255);
-		*dest++ = clamp_u8(out_device_b*255);
+		dest[r_out] = clamp_u8(out_device_r*255);
+		dest[1]     = clamp_u8(out_device_g*255);
+		dest[b_out] = clamp_u8(out_device_b*255);
+		dest += 3;
 	}
 }
 
@@ -283,8 +300,11 @@ static void qcms_transform_data_gray_out_lut(qcms_transform *transform, unsigned
 	See: ftp://ftp.alvyray.com/Acrobat/17_Nonln.pdf
 */
 
-static void qcms_transform_data_graya_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_graya_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	for (i = 0; i < length; i++) {
 		float out_device_r, out_device_g, out_device_b;
@@ -293,20 +313,24 @@ static void qcms_transform_data_graya_out_lut(qcms_transform *transform, unsigne
 
 		float linear = transform->input_gamma_table_gray[device];
 
-                out_device_r = lut_interp_linear(linear, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
+		out_device_r = lut_interp_linear(linear, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
 		out_device_g = lut_interp_linear(linear, transform->output_gamma_lut_g, transform->output_gamma_lut_g_length);
 		out_device_b = lut_interp_linear(linear, transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
 
-		*dest++ = clamp_u8(out_device_r*255);
-		*dest++ = clamp_u8(out_device_g*255);
-		*dest++ = clamp_u8(out_device_b*255);
-		*dest++ = alpha;
+		dest[r_out] = clamp_u8(out_device_r*255);
+		dest[1]     = clamp_u8(out_device_g*255);
+		dest[b_out] = clamp_u8(out_device_b*255);
+		dest[3]     = alpha;
+		dest += 4;
 	}
 }
 
 
-static void qcms_transform_data_gray_out_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_gray_out_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	for (i = 0; i < length; i++) {
 		unsigned char device = *src++;
@@ -317,14 +341,19 @@ static void qcms_transform_data_gray_out_precache(qcms_transform *transform, uns
 		/* we could round here... */
 		gray = linear * PRECACHE_OUTPUT_MAX;
 
-		*dest++ = transform->output_table_r->data[gray];
-		*dest++ = transform->output_table_g->data[gray];
-		*dest++ = transform->output_table_b->data[gray];
+		dest[r_out] = transform->output_table_r->data[gray];
+		dest[1]     = transform->output_table_g->data[gray];
+		dest[b_out] = transform->output_table_b->data[gray];
+		dest += 3;
 	}
 }
 
-static void qcms_transform_data_graya_out_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+
+static void qcms_transform_data_graya_out_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	for (i = 0; i < length; i++) {
 		unsigned char device = *src++;
@@ -336,15 +365,19 @@ static void qcms_transform_data_graya_out_precache(qcms_transform *transform, un
 		/* we could round here... */
 		gray = linear * PRECACHE_OUTPUT_MAX;
 
-		*dest++ = transform->output_table_r->data[gray];
-		*dest++ = transform->output_table_g->data[gray];
-		*dest++ = transform->output_table_b->data[gray];
-		*dest++ = alpha;
+		dest[r_out] = transform->output_table_r->data[gray];
+		dest[1]     = transform->output_table_g->data[gray];
+		dest[b_out] = transform->output_table_b->data[gray];
+		dest[3]     = alpha;
+		dest += 4;
 	}
 }
 
-static void qcms_transform_data_rgb_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_rgb_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	float (*mat)[4] = transform->matrix;
 	for (i = 0; i < length; i++) {
@@ -370,14 +403,18 @@ static void qcms_transform_data_rgb_out_lut_precache(qcms_transform *transform,
 		g = out_linear_g * PRECACHE_OUTPUT_MAX;
 		b = out_linear_b * PRECACHE_OUTPUT_MAX;
 
-		*dest++ = transform->output_table_r->data[r];
-		*dest++ = transform->output_table_g->data[g];
-		*dest++ = transform->output_table_b->data[b];
+		dest[r_out] = transform->output_table_r->data[r];
+		dest[1]     = transform->output_table_g->data[g];
+		dest[b_out] = transform->output_table_b->data[b];
+		dest += 3;
 	}
 }
 
-static void qcms_transform_data_rgba_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_rgba_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	float (*mat)[4] = transform->matrix;
 	for (i = 0; i < length; i++) {
@@ -404,16 +441,21 @@ static void qcms_transform_data_rgba_out_lut_precache(qcms_transform *transform,
 		g = out_linear_g * PRECACHE_OUTPUT_MAX;
 		b = out_linear_b * PRECACHE_OUTPUT_MAX;
 
-		*dest++ = transform->output_table_r->data[r];
-		*dest++ = transform->output_table_g->data[g];
-		*dest++ = transform->output_table_b->data[b];
-		*dest++ = alpha;
+		dest[r_out] = transform->output_table_r->data[r];
+		dest[1]     = transform->output_table_g->data[g];
+		dest[b_out] = transform->output_table_b->data[b];
+		dest[3]     = alpha;
+		dest += 4;
 	}
 }
 
 // Not used
 /* 
-static void qcms_transform_data_clut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length) {
+static void qcms_transform_data_clut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
+{
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	int xy_len = 1;
 	int x_len = transform->grid_size;
@@ -462,15 +504,20 @@ static void qcms_transform_data_clut(qcms_transform *transform, unsigned char *s
 		float b_y2 = lerp(b_x3, b_x4, y_d);
 		float clut_b = lerp(b_y1, b_y2, z_d);
 
-		*dest++ = clamp_u8(clut_r*255.0f);
-		*dest++ = clamp_u8(clut_g*255.0f);
-		*dest++ = clamp_u8(clut_b*255.0f);
-	}	
+		dest[r_out] = clamp_u8(clut_r*255.0f);
+		dest[1]     = clamp_u8(clut_g*255.0f);
+		dest[b_out] = clamp_u8(clut_b*255.0f);
+		dest += 3;
+	}
 }
 */
 
 // Using lcms' tetra interpolation algorithm.
-static void qcms_transform_data_tetra_clut_rgba(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length) {
+static void qcms_transform_data_tetra_clut_rgba(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
+{
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	int xy_len = 1;
 	int x_len = transform->grid_size;
@@ -577,15 +624,20 @@ static void qcms_transform_data_tetra_clut_rgba(qcms_transform *transform, unsig
 		clut_g = c0_g + c1_g*rx + c2_g*ry + c3_g*rz;
 		clut_b = c0_b + c1_b*rx + c2_b*ry + c3_b*rz;
 
-		*dest++ = clamp_u8(clut_r*255.0f);
-		*dest++ = clamp_u8(clut_g*255.0f);
-		*dest++ = clamp_u8(clut_b*255.0f);
-		*dest++ = in_a;
-	}	
+		dest[r_out] = clamp_u8(clut_r*255.0f);
+		dest[1]     = clamp_u8(clut_g*255.0f);
+		dest[b_out] = clamp_u8(clut_b*255.0f);
+		dest[3]     = in_a;
+		dest += 4;
+	}
 }
 
 // Using lcms' tetra interpolation code.
-static void qcms_transform_data_tetra_clut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length) {
+static void qcms_transform_data_tetra_clut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
+{
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	int xy_len = 1;
 	int x_len = transform->grid_size;
@@ -691,14 +743,18 @@ static void qcms_transform_data_tetra_clut(qcms_transform *transform, unsigned c
 		clut_g = c0_g + c1_g*rx + c2_g*ry + c3_g*rz;
 		clut_b = c0_b + c1_b*rx + c2_b*ry + c3_b*rz;
 
-		*dest++ = clamp_u8(clut_r*255.0f);
-		*dest++ = clamp_u8(clut_g*255.0f);
-		*dest++ = clamp_u8(clut_b*255.0f);
-	}	
+		dest[r_out] = clamp_u8(clut_r*255.0f);
+		dest[1]     = clamp_u8(clut_g*255.0f);
+		dest[b_out] = clamp_u8(clut_b*255.0f);
+		dest += 3;
+	}
 }
 
-static void qcms_transform_data_rgb_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_rgb_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	float (*mat)[4] = transform->matrix;
 	for (i = 0; i < length; i++) {
@@ -726,14 +782,18 @@ static void qcms_transform_data_rgb_out_lut(qcms_transform *transform, unsigned
 		out_device_b = lut_interp_linear(out_linear_b, 
 				transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
 
-		*dest++ = clamp_u8(out_device_r*255);
-		*dest++ = clamp_u8(out_device_g*255);
-		*dest++ = clamp_u8(out_device_b*255);
+		dest[r_out] = clamp_u8(out_device_r*255);
+		dest[1]     = clamp_u8(out_device_g*255);
+		dest[b_out] = clamp_u8(out_device_b*255);
+		dest += 3;
 	}
 }
 
-static void qcms_transform_data_rgba_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_rgba_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	unsigned int i;
 	float (*mat)[4] = transform->matrix;
 	for (i = 0; i < length; i++) {
@@ -762,16 +822,20 @@ static void qcms_transform_data_rgba_out_lut(qcms_transform *transform, unsigned
 		out_device_b = lut_interp_linear(out_linear_b, 
 				transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
 
-		*dest++ = clamp_u8(out_device_r*255);
-		*dest++ = clamp_u8(out_device_g*255);
-		*dest++ = clamp_u8(out_device_b*255);
-		*dest++ = alpha;
+		dest[r_out] = clamp_u8(out_device_r*255);
+		dest[1]     = clamp_u8(out_device_g*255);
+		dest[b_out] = clamp_u8(out_device_b*255);
+		dest[3]     = alpha;
+		dest += 4;
 	}
 }
 
 #if 0
-static void qcms_transform_data_rgb_out_linear(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
+static void qcms_transform_data_rgb_out_linear(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
+	const int r_out = output_format.r;
+	const int b_out = output_format.b;
+
 	int i;
 	float (*mat)[4] = transform->matrix;
 	for (i = 0; i < length; i++) {
@@ -787,16 +851,25 @@ static void qcms_transform_data_rgb_out_linear(qcms_transform *transform, unsign
 		float out_linear_g = mat[0][1]*linear_r + mat[1][1]*linear_g + mat[2][1]*linear_b;
 		float out_linear_b = mat[0][2]*linear_r + mat[1][2]*linear_g + mat[2][2]*linear_b;
 
-		*dest++ = clamp_u8(out_linear_r*255);
-		*dest++ = clamp_u8(out_linear_g*255);
-		*dest++ = clamp_u8(out_linear_b*255);
+		dest[r_out] = clamp_u8(out_linear_r*255);
+		dest[1]     = clamp_u8(out_linear_g*255);
+		dest[b_out] = clamp_u8(out_linear_b*255);
+		dest += 3;
 	}
 }
 #endif
 
+/*
+ * If users create and destroy objects on different threads, even if the same
+ * objects aren't used on different threads at the same time, we can still run
+ * in to trouble with refcounts if they aren't atomic.
+ *
+ * This can lead to us prematurely deleting the precache if threads get unlucky
+ * and write the wrong value to the ref count.
+ */
 static struct precache_output *precache_reference(struct precache_output *p)
 {
-	p->ref_count++;
+	qcms_atomic_increment(p->ref_count);
 	return p;
 }
 
@@ -810,12 +883,12 @@ static struct precache_output *precache_create()
 
 void precache_release(struct precache_output *p)
 {
-	if (--p->ref_count == 0) {
+	if (qcms_atomic_decrement(p->ref_count) == 0) {
 		free(p);
 	}
 }
 
-#ifdef HAS_POSIX_MEMALIGN
+#ifdef HAVE_POSIX_MEMALIGN
 static qcms_transform *transform_alloc(void)
 {
 	qcms_transform *t;
@@ -994,13 +1067,15 @@ void qcms_profile_precache_output_transform(qcms_profile *profile)
 	if (profile->color_space != RGB_SIGNATURE)
 		return;
 
-	/* don't precache since we will use the B2A LUT */
-	if (profile->B2A0)
-		return;
+	if (qcms_supports_iccv4) {
+		/* don't precache since we will use the B2A LUT */
+		if (profile->B2A0)
+			return;
 
-	/* don't precache since we will use the mBA LUT */
-	if (profile->mBA)
-		return;
+		/* don't precache since we will use the mBA LUT */
+		if (profile->mBA)
+			return;
+	}
 
 	/* don't precache if we do not have the TRC curves */
 	if (!profile->redTRC || !profile->greenTRC || !profile->blueTRC)
@@ -1078,7 +1153,8 @@ qcms_transform* qcms_transform_precacheLUT_float(qcms_transform *transform, qcms
 	//XXX: qcms_modular_transform_data may return either the src or dest buffer. If so it must not be free-ed
 	if (src && lut != src) {
 		free(src);
-	} else if (dest && lut != src) {
+	}
+	if (dest && lut != dest) {
 		free(dest);
 	}
 
@@ -1157,14 +1233,14 @@ qcms_transform* qcms_transform_create(
                 	return NULL;
             	}
 		if (precache) {
-#ifdef X86
+#if defined(SSE2_ENABLE) && defined(X86)
 		    if (sse_version_available() >= 2) {
 			    if (in_type == QCMS_DATA_RGB_8)
 				    transform->transform_fn = qcms_transform_data_rgb_out_lut_sse2;
 			    else
 				    transform->transform_fn = qcms_transform_data_rgba_out_lut_sse2;
 
-#if !(defined(_MSC_VER) && defined(_M_AMD64))
+#if defined(SSE2_ENABLE) && !(defined(_MSC_VER) && defined(_M_AMD64))
                     /* Microsoft Compiler for x64 doesn't support MMX.
                      * SSE code uses MMX so that we disable on x64 */
 		    } else
@@ -1256,13 +1332,34 @@ qcms_transform* qcms_transform_create(
 	return transform;
 }
 
-#if defined(__GNUC__) && !defined(__x86_64__) && !defined(__amd64__)
+/* __force_align_arg_pointer__ is an x86-only attribute, and gcc/clang warns on unused
+ * attributes. Don't use this on ARM or AMD64. __has_attribute can detect the presence
+ * of the attribute but is currently only supported by clang */
+#if defined(__has_attribute)
+#define HAS_FORCE_ALIGN_ARG_POINTER __has_attribute(__force_align_arg_pointer__)
+#elif defined(__GNUC__) && !defined(__x86_64__) && !defined(__amd64__) && !defined(__arm__) && !defined(__mips__)
+#define HAS_FORCE_ALIGN_ARG_POINTER 1
+#else
+#define HAS_FORCE_ALIGN_ARG_POINTER 0
+#endif
+
+#if HAS_FORCE_ALIGN_ARG_POINTER
 /* we need this to avoid crashes when gcc assumes the stack is 128bit aligned */
 __attribute__((__force_align_arg_pointer__))
 #endif
 void qcms_transform_data(qcms_transform *transform, void *src, void *dest, size_t length)
 {
-	transform->transform_fn(transform, src, dest, length);
+	static const struct _qcms_format_type output_rgbx = { 0, 2 };
+
+	transform->transform_fn(transform, src, dest, length, output_rgbx);
+}
+
+void qcms_transform_data_type(qcms_transform *transform, void *src, void *dest, size_t length, qcms_output_type type)
+{
+	static const struct _qcms_format_type output_rgbx = { 0, 2 };
+	static const struct _qcms_format_type output_bgrx = { 2, 0 };
+
+	transform->transform_fn(transform, src, dest, length, type == QCMS_OUTPUT_BGRX ? output_bgrx : output_rgbx);
 }
 
 qcms_bool qcms_supports_iccv4;
diff --git a/third_party/qcms/src/transform_util.c b/third_party/qcms/src/transform_util.c
index e8447e5..f4338b2 100644
--- a/third_party/qcms/src/transform_util.c
+++ b/third_party/qcms/src/transform_util.c
@@ -36,7 +36,7 @@
 
 /* value must be a value between 0 and 1 */
 //XXX: is the above a good restriction to have?
-float lut_interp_linear(double value, uint16_t *table, int length)
+float lut_interp_linear(double value, uint16_t *table, size_t length)
 {
 	int upper, lower;
 	value = value * (length - 1); // scale to length of the array
@@ -49,11 +49,11 @@ float lut_interp_linear(double value, uint16_t *table, int length)
 }
 
 /* same as above but takes and returns a uint16_t value representing a range from 0..1 */
-uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length)
+uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, size_t length)
 {
 	/* Start scaling input_value to the length of the array: 65535*(length-1).
 	 * We'll divide out the 65535 next */
-	uint32_t value = (input_value * (length - 1));
+	uintptr_t value = (input_value * (length - 1));
 	uint32_t upper = (value + 65534) / 65535; /* equivalent to ceil(value/65535) */
 	uint32_t lower = value / 65535;           /* equivalent to floor(value/65535) */
 	/* interp is the distance from upper to value scaled to 0..65535 */
@@ -67,11 +67,11 @@ uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length)
 /* same as above but takes an input_value from 0..PRECACHE_OUTPUT_MAX
  * and returns a uint8_t value representing a range from 0..1 */
 static
-uint8_t lut_interp_linear_precache_output(uint32_t input_value, uint16_t *table, int length)
+uint8_t lut_interp_linear_precache_output(uint32_t input_value, uint16_t *table, size_t length)
 {
 	/* Start scaling input_value to the length of the array: PRECACHE_OUTPUT_MAX*(length-1).
 	 * We'll divide out the PRECACHE_OUTPUT_MAX next */
-	uint32_t value = (input_value * (length - 1));
+	uintptr_t value = (input_value * (length - 1));
 
 	/* equivalent to ceil(value/PRECACHE_OUTPUT_MAX) */
 	uint32_t upper = (value + PRECACHE_OUTPUT_MAX-1) / PRECACHE_OUTPUT_MAX;
@@ -91,7 +91,7 @@ uint8_t lut_interp_linear_precache_output(uint32_t input_value, uint16_t *table,
 
 /* value must be a value between 0 and 1 */
 //XXX: is the above a good restriction to have?
-float lut_interp_linear_float(float value, float *table, int length)
+float lut_interp_linear_float(float value, float *table, size_t length)
 {
         int upper, lower;
         value = value * (length - 1);
@@ -235,6 +235,21 @@ float u8Fixed8Number_to_float(uint16_t x)
 	return x/256.;
 }
 
+/* The SSE2 code uses min & max which let NaNs pass through.
+   We want to try to prevent that here by ensuring that
+   gamma table is within expected values. */
+void validate_gamma_table(float gamma_table[256])
+{
+	int i;
+	for (i = 0; i < 256; i++) {
+		// Note: we check that the gamma is not in range
+		// instead of out of range so that we catch NaNs
+		if (!(gamma_table[i] >= 0.f && gamma_table[i] <= 1.f)) {
+			gamma_table[i] = 0.f;
+		}
+	}
+}
+
 float *build_input_gamma_table(struct curveType *TRC)
 {
 	float *gamma_table;
@@ -254,7 +269,10 @@ float *build_input_gamma_table(struct curveType *TRC)
 			}
 		}
 	}
-        return gamma_table;
+
+	validate_gamma_table(gamma_table);
+
+	return gamma_table;
 }
 
 struct matrix build_colorant_matrix(qcms_profile *p)
@@ -390,7 +408,7 @@ uint16_fract_t lut_inverse_interp16(uint16_t Value, uint16_t LutTable[], int len
  which has an maximum error of about 9855 (pixel difference of ~38.346)
 
  For now, we punt the decision of output size to the caller. */
-static uint16_t *invert_lut(uint16_t *table, int length, int out_length)
+static uint16_t *invert_lut(uint16_t *table, int length, size_t out_length)
 {
         int i;
         /* for now we invert the lut by creating a lut of size out_length
diff --git a/third_party/qcms/src/transform_util.h b/third_party/qcms/src/transform_util.h
index 8f358a8..de465f4 100644
--- a/third_party/qcms/src/transform_util.h
+++ b/third_party/qcms/src/transform_util.h
@@ -31,9 +31,9 @@
 //XXX: could use a bettername
 typedef uint16_t uint16_fract_t;
 
-float lut_interp_linear(double value, uint16_t *table, int length);
-float lut_interp_linear_float(float value, float *table, int length);
-uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length);
+float lut_interp_linear(double value, uint16_t *table, size_t length);
+float lut_interp_linear_float(float value, float *table, size_t length);
+uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, size_t length);
 
 
 static inline float lerp(float a, float b, float t)