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Unified Diff: third_party/qcms/iccread.c

Issue 9702032: Adding qcms to use for handling ICC tagged images. (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: Add qcms to third_party Created 8 years, 9 months ago
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Index: third_party/qcms/iccread.c
diff --git a/third_party/qcms/iccread.c b/third_party/qcms/iccread.c
new file mode 100644
index 0000000000000000000000000000000000000000..36b701179a91d41d1be5fb6dd7b7215bb88d7f3e
--- /dev/null
+++ b/third_party/qcms/iccread.c
@@ -0,0 +1,1204 @@
+/* vim: set ts=8 sw=8 noexpandtab: */
+// qcms
+// Copyright (C) 2009 Mozilla Foundation
+// Copyright (C) 1998-2007 Marti Maria
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the Software
+// is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#include <math.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h> //memset
+#include "qcmsint.h"
+
+/* It might be worth having a unified limit on content controlled
+ * allocation per profile. This would remove the need for many
+ * of the arbitrary limits that we used */
+
+typedef uint32_t be32;
+typedef uint16_t be16;
+
+#if 0
+not used yet
+/* __builtin_bswap isn't available in older gccs
+ * so open code it for now */
+static be32 cpu_to_be32(int32_t v)
+{
+#ifdef IS_LITTLE_ENDIAN
+ return ((v & 0xff) << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | ((v & 0xff000000) >> 24);
+ //return __builtin_bswap32(v);
+ return v;
+#endif
+}
+#endif
+
+static uint32_t be32_to_cpu(be32 v)
+{
+#ifdef IS_LITTLE_ENDIAN
+ return ((v & 0xff) << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | ((v & 0xff000000) >> 24);
+ //return __builtin_bswap32(v);
+#else
+ return v;
+#endif
+}
+
+static uint16_t be16_to_cpu(be16 v)
+{
+#ifdef IS_LITTLE_ENDIAN
+ return ((v & 0xff) << 8) | ((v & 0xff00) >> 8);
+#else
+ return v;
+#endif
+}
+
+/* a wrapper around the memory that we are going to parse
+ * into a qcms_profile */
+struct mem_source
+{
+ const unsigned char *buf;
+ size_t size;
+ qcms_bool valid;
+ const char *invalid_reason;
+};
+
+static void invalid_source(struct mem_source *mem, const char *reason)
+{
+ mem->valid = false;
+ mem->invalid_reason = reason;
+}
+
+static uint32_t read_u32(struct mem_source *mem, size_t offset)
+{
+ /* Subtract from mem->size instead of the more intuitive adding to offset.
+ * This avoids overflowing offset. The subtraction is safe because
+ * mem->size is guaranteed to be > 4 */
+ if (offset > mem->size - 4) {
+ invalid_source(mem, "Invalid offset");
+ return 0;
+ } else {
+ be32 k;
+ memcpy(&k, mem->buf + offset, sizeof(k));
+ return be32_to_cpu(k);
+ }
+}
+
+static uint16_t read_u16(struct mem_source *mem, size_t offset)
+{
+ if (offset > mem->size - 2) {
+ invalid_source(mem, "Invalid offset");
+ return 0;
+ } else {
+ be16 k;
+ memcpy(&k, mem->buf + offset, sizeof(k));
+ return be16_to_cpu(k);
+ }
+}
+
+static uint8_t read_u8(struct mem_source *mem, size_t offset)
+{
+ if (offset > mem->size - 1) {
+ invalid_source(mem, "Invalid offset");
+ return 0;
+ } else {
+ return *(uint8_t*)(mem->buf + offset);
+ }
+}
+
+static s15Fixed16Number read_s15Fixed16Number(struct mem_source *mem, size_t offset)
+{
+ return read_u32(mem, offset);
+}
+
+static uInt8Number read_uInt8Number(struct mem_source *mem, size_t offset)
+{
+ return read_u8(mem, offset);
+}
+
+static uInt16Number read_uInt16Number(struct mem_source *mem, size_t offset)
+{
+ return read_u16(mem, offset);
+}
+
+#define BAD_VALUE_PROFILE NULL
+#define INVALID_PROFILE NULL
+#define NO_MEM_PROFILE NULL
+
+/* An arbitrary 4MB limit on profile size */
+#define MAX_PROFILE_SIZE 1024*1024*4
+#define MAX_TAG_COUNT 1024
+
+static void check_CMM_type_signature(struct mem_source *src)
+{
+ //uint32_t CMM_type_signature = read_u32(src, 4);
+ //TODO: do the check?
+
+}
+
+static void check_profile_version(struct mem_source *src)
+{
+
+ /*
+ uint8_t major_revision = read_u8(src, 8 + 0);
+ uint8_t minor_revision = read_u8(src, 8 + 1);
+ */
+ uint8_t reserved1 = read_u8(src, 8 + 2);
+ uint8_t reserved2 = read_u8(src, 8 + 3);
+ /* Checking the version doesn't buy us anything
+ if (major_revision != 0x4) {
+ if (major_revision > 0x2)
+ invalid_source(src, "Unsupported major revision");
+ if (minor_revision > 0x40)
+ invalid_source(src, "Unsupported minor revision");
+ }
+ */
+ if (reserved1 != 0 || reserved2 != 0)
+ invalid_source(src, "Invalid reserved bytes");
+}
+
+#define INPUT_DEVICE_PROFILE 0x73636e72 // 'scnr'
+#define DISPLAY_DEVICE_PROFILE 0x6d6e7472 // 'mntr'
+#define OUTPUT_DEVICE_PROFILE 0x70727472 // 'prtr'
+#define DEVICE_LINK_PROFILE 0x6c696e6b // 'link'
+#define COLOR_SPACE_PROFILE 0x73706163 // 'spac'
+#define ABSTRACT_PROFILE 0x61627374 // 'abst'
+#define NAMED_COLOR_PROFILE 0x6e6d636c // 'nmcl'
+
+static void read_class_signature(qcms_profile *profile, struct mem_source *mem)
+{
+ profile->class = read_u32(mem, 12);
+ switch (profile->class) {
+ case DISPLAY_DEVICE_PROFILE:
+ case INPUT_DEVICE_PROFILE:
+ case OUTPUT_DEVICE_PROFILE:
+ case COLOR_SPACE_PROFILE:
+ break;
+ default:
+ invalid_source(mem, "Invalid Profile/Device Class signature");
+ }
+}
+
+static void read_color_space(qcms_profile *profile, struct mem_source *mem)
+{
+ profile->color_space = read_u32(mem, 16);
+ switch (profile->color_space) {
+ case RGB_SIGNATURE:
+ case GRAY_SIGNATURE:
+ break;
+ default:
+ invalid_source(mem, "Unsupported colorspace");
+ }
+}
+
+static void read_pcs(qcms_profile *profile, struct mem_source *mem)
+{
+ profile->pcs = read_u32(mem, 20);
+ switch (profile->pcs) {
+ case XYZ_SIGNATURE:
+ case LAB_SIGNATURE:
+ break;
+ default:
+ invalid_source(mem, "Unsupported pcs");
+ }
+}
+
+struct tag
+{
+ uint32_t signature;
+ uint32_t offset;
+ uint32_t size;
+};
+
+struct tag_index {
+ uint32_t count;
+ struct tag *tags;
+};
+
+static struct tag_index read_tag_table(qcms_profile *profile, struct mem_source *mem)
+{
+ struct tag_index index = {0, NULL};
+ unsigned int i;
+
+ index.count = read_u32(mem, 128);
+ if (index.count > MAX_TAG_COUNT) {
+ invalid_source(mem, "max number of tags exceeded");
+ return index;
+ }
+
+ index.tags = malloc(sizeof(struct tag)*index.count);
+ if (index.tags) {
+ for (i = 0; i < index.count; i++) {
+ index.tags[i].signature = read_u32(mem, 128 + 4 + 4*i*3);
+ index.tags[i].offset = read_u32(mem, 128 + 4 + 4*i*3 + 4);
+ index.tags[i].size = read_u32(mem, 128 + 4 + 4*i*3 + 8);
+ }
+ }
+
+ return index;
+}
+
+// Checks a profile for obvious inconsistencies and returns
+// true if the profile looks bogus and should probably be
+// ignored.
+qcms_bool qcms_profile_is_bogus(qcms_profile *profile)
+{
+ float sum[3], target[3], tolerance[3];
+ float rX, rY, rZ, gX, gY, gZ, bX, bY, bZ;
+ bool negative;
+ unsigned i;
+
+ // We currently only check the bogosity of RGB profiles
+ if (profile->color_space != RGB_SIGNATURE)
+ return false;
+
+ if (profile->A2B0 || profile->B2A0)
+ return false;
+
+ rX = s15Fixed16Number_to_float(profile->redColorant.X);
+ rY = s15Fixed16Number_to_float(profile->redColorant.Y);
+ rZ = s15Fixed16Number_to_float(profile->redColorant.Z);
+
+ gX = s15Fixed16Number_to_float(profile->greenColorant.X);
+ gY = s15Fixed16Number_to_float(profile->greenColorant.Y);
+ gZ = s15Fixed16Number_to_float(profile->greenColorant.Z);
+
+ bX = s15Fixed16Number_to_float(profile->blueColorant.X);
+ bY = s15Fixed16Number_to_float(profile->blueColorant.Y);
+ bZ = s15Fixed16Number_to_float(profile->blueColorant.Z);
+
+ // Check if any of the XYZ values are negative (see mozilla bug 498245)
+ // CIEXYZ tristimulus values cannot be negative according to the spec.
+ negative =
+ (rX < 0) || (rY < 0) || (rZ < 0) ||
+ (gX < 0) || (gY < 0) || (gZ < 0) ||
+ (bX < 0) || (bY < 0) || (bZ < 0);
+
+ if (negative)
+ return true;
+
+
+ // Sum the values; they should add up to something close to white
+ sum[0] = rX + gX + bX;
+ sum[1] = rY + gY + bY;
+ sum[2] = rZ + gZ + bZ;
+
+ // Build our target vector (see mozilla bug 460629)
+ target[0] = 0.96420;
+ target[1] = 1.00000;
+ target[2] = 0.82491;
+
+ // Our tolerance vector - Recommended by Chris Murphy based on
+ // conversion from the LAB space criterion of no more than 3 in any one
+ // channel. This is similar to, but slightly more tolerant than Adobe's
+ // criterion.
+ tolerance[0] = 0.02;
+ tolerance[1] = 0.02;
+ tolerance[2] = 0.04;
+
+ // Compare with our tolerance
+ for (i = 0; i < 3; ++i) {
+ if (!(((sum[i] - tolerance[i]) <= target[i]) &&
+ ((sum[i] + tolerance[i]) >= target[i])))
+ return true;
+ }
+
+ // All Good
+ return false;
+}
+
+#define TAG_bXYZ 0x6258595a
+#define TAG_gXYZ 0x6758595a
+#define TAG_rXYZ 0x7258595a
+#define TAG_rTRC 0x72545243
+#define TAG_bTRC 0x62545243
+#define TAG_gTRC 0x67545243
+#define TAG_kTRC 0x6b545243
+#define TAG_A2B0 0x41324230
+#define TAG_B2A0 0x42324130
+#define TAG_CHAD 0x63686164
+
+static struct tag *find_tag(struct tag_index index, uint32_t tag_id)
+{
+ unsigned int i;
+ struct tag *tag = NULL;
+ for (i = 0; i < index.count; i++) {
+ if (index.tags[i].signature == tag_id) {
+ return &index.tags[i];
+ }
+ }
+ return tag;
+}
+
+#define XYZ_TYPE 0x58595a20 // 'XYZ '
+#define CURVE_TYPE 0x63757276 // 'curv'
+#define PARAMETRIC_CURVE_TYPE 0x70617261 // 'para'
+#define LUT16_TYPE 0x6d667432 // 'mft2'
+#define LUT8_TYPE 0x6d667431 // 'mft1'
+#define LUT_MAB_TYPE 0x6d414220 // 'mAB '
+#define LUT_MBA_TYPE 0x6d424120 // 'mBA '
+#define CHROMATIC_TYPE 0x73663332 // 'sf32'
+
+static struct matrix read_tag_s15Fixed16ArrayType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
+{
+ struct tag *tag = find_tag(index, tag_id);
+ struct matrix matrix;
+ if (tag) {
+ uint8_t i;
+ uint32_t offset = tag->offset;
+ uint32_t type = read_u32(src, offset);
+
+ // Check mandatory type signature for s16Fixed16ArrayType
+ if (type != CHROMATIC_TYPE) {
+ invalid_source(src, "unexpected type, expected 'sf32'");
+ }
+
+ for (i = 0; i < 9; i++) {
+ matrix.m[i/3][i%3] = s15Fixed16Number_to_float(read_s15Fixed16Number(src, offset+8+i*4));
+ }
+ matrix.invalid = false;
+ } else {
+ matrix.invalid = true;
+ invalid_source(src, "missing sf32tag");
+ }
+ return matrix;
+}
+
+static struct XYZNumber read_tag_XYZType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
+{
+ struct XYZNumber num = {0, 0, 0};
+ struct tag *tag = find_tag(index, tag_id);
+ if (tag) {
+ uint32_t offset = tag->offset;
+
+ uint32_t type = read_u32(src, offset);
+ if (type != XYZ_TYPE)
+ invalid_source(src, "unexpected type, expected XYZ");
+ num.X = read_s15Fixed16Number(src, offset+8);
+ num.Y = read_s15Fixed16Number(src, offset+12);
+ num.Z = read_s15Fixed16Number(src, offset+16);
+ } else {
+ invalid_source(src, "missing xyztag");
+ }
+ return num;
+}
+
+// Read the tag at a given offset rather then the tag_index.
+// This method is used when reading mAB tags where nested curveType are
+// 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};
+ struct curveType *curve = NULL;
+ uint32_t type = read_u32(src, offset);
+ uint32_t count;
+ int i;
+
+ if (type != CURVE_TYPE && type != PARAMETRIC_CURVE_TYPE) {
+ invalid_source(src, "unexpected type, expected CURV or PARA");
+ return NULL;
+ }
+
+ if (type == CURVE_TYPE) {
+ count = read_u32(src, offset+8);
+
+#define MAX_CURVE_ENTRIES 40000 //arbitrary
+ if (count > MAX_CURVE_ENTRIES) {
+ invalid_source(src, "curve size too large");
+ return NULL;
+ }
+ curve = malloc(sizeof(struct curveType) + sizeof(uInt16Number)*count);
+ if (!curve)
+ return NULL;
+
+ curve->count = count;
+ curve->type = type;
+
+ for (i=0; i<count; i++) {
+ curve->data[i] = read_u16(src, offset + 12 + i*2);
+ }
+ *len = 12 + count * 2;
+ } else { //PARAMETRIC_CURVE_TYPE
+ count = read_u16(src, offset+8);
+
+ if (count > 4) {
+ invalid_source(src, "parametric function type not supported.");
+ return NULL;
+ }
+
+ curve = malloc(sizeof(struct curveType));
+ if (!curve)
+ return NULL;
+
+ curve->count = count;
+ curve->type = type;
+
+ for (i=0; i < COUNT_TO_LENGTH[count]; i++) {
+ curve->parameter[i] = s15Fixed16Number_to_float(read_s15Fixed16Number(src, offset + 12 + i*4));
+ }
+ *len = 12 + COUNT_TO_LENGTH[count] * 4;
+
+ if ((count == 1 || count == 2)) {
+ /* we have a type 1 or type 2 function that has a division by 'a' */
+ float a = curve->parameter[1];
+ if (a == 0.f)
+ invalid_source(src, "parametricCurve definition causes division by zero.");
+ }
+ }
+
+ return curve;
+}
+
+static struct curveType *read_tag_curveType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
+{
+ struct tag *tag = find_tag(index, tag_id);
+ struct curveType *curve = NULL;
+ if (tag) {
+ uint32_t len;
+ return read_curveType(src, tag->offset, &len);
+ } else {
+ invalid_source(src, "missing curvetag");
+ }
+
+ return curve;
+}
+
+#define MAX_CLUT_SIZE 500000 // arbitrary
+#define MAX_CHANNELS 10 // arbitrary
+static void read_nested_curveType(struct mem_source *src, struct curveType *(*curveArray)[MAX_CHANNELS], uint8_t num_channels, uint32_t curve_offset)
+{
+ uint32_t channel_offset = 0;
+ int i;
+ for (i = 0; i < num_channels; i++) {
+ uint32_t tag_len;
+
+ (*curveArray)[i] = read_curveType(src, curve_offset + channel_offset, &tag_len);
+ if (!(*curveArray)[i]) {
+ invalid_source(src, "invalid nested curveType curve");
+ }
+
+ 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)
+{
+ uint8_t i;
+
+ for (i = 0; i < lut->num_in_channels; i++){
+ free(lut->a_curves[i]);
+ }
+ for (i = 0; i < lut->num_out_channels; i++){
+ free(lut->b_curves[i]);
+ free(lut->m_curves[i]);
+ }
+ free(lut);
+}
+
+/* See section 10.10 for specs */
+static struct lutmABType *read_tag_lutmABType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
+{
+ struct tag *tag = find_tag(index, tag_id);
+ uint32_t offset = tag->offset;
+ uint32_t a_curve_offset, b_curve_offset, m_curve_offset;
+ uint32_t matrix_offset;
+ uint32_t clut_offset;
+ uint32_t clut_size = 1;
+ uint8_t clut_precision;
+ uint32_t type = read_u32(src, offset);
+ uint8_t num_in_channels, num_out_channels;
+ struct lutmABType *lut;
+ int i;
+
+ if (type != LUT_MAB_TYPE && type != LUT_MBA_TYPE) {
+ return NULL;
+ }
+
+ num_in_channels = read_u8(src, offset + 8);
+ num_out_channels = read_u8(src, offset + 8);
+ if (num_in_channels > MAX_CHANNELS || num_out_channels > MAX_CHANNELS)
+ return NULL;
+
+ // We require 3in/out channels since we only support RGB->XYZ (or RGB->LAB)
+ // XXX: If we remove this restriction make sure that the number of channels
+ // is less or equal to the maximum number of mAB curves in qcmsint.h
+ // also check for clut_size overflow.
+ if (num_in_channels != 3 || num_out_channels != 3)
+ return NULL;
+
+ // some of this data is optional and is denoted by a zero offset
+ // we also use this to track their existance
+ a_curve_offset = read_u32(src, offset + 28);
+ clut_offset = read_u32(src, offset + 24);
+ m_curve_offset = read_u32(src, offset + 20);
+ matrix_offset = read_u32(src, offset + 16);
+ b_curve_offset = read_u32(src, offset + 12);
+
+ // Convert offsets relative to the tag to relative to the profile
+ // preserve zero for optional fields
+ if (a_curve_offset)
+ a_curve_offset += offset;
+ if (clut_offset)
+ clut_offset += offset;
+ if (m_curve_offset)
+ m_curve_offset += offset;
+ if (matrix_offset)
+ matrix_offset += offset;
+ if (b_curve_offset)
+ b_curve_offset += offset;
+
+ if (clut_offset) {
+ assert (num_in_channels == 3);
+ // clut_size can not overflow since lg(256^num_in_channels) = 24 bits.
+ for (i = 0; i < num_in_channels; i++) {
+ clut_size *= read_u8(src, clut_offset + i);
+ }
+ } else {
+ clut_size = 0;
+ }
+
+ // 24bits * 3 won't overflow either
+ clut_size = clut_size * num_out_channels;
+
+ if (clut_size > MAX_CLUT_SIZE)
+ return NULL;
+
+ lut = malloc(sizeof(struct lutmABType) + (clut_size) * sizeof(float));
+ if (!lut)
+ return NULL;
+ // we'll fill in the rest below
+ memset(lut, 0, sizeof(struct lutmABType));
+ lut->clut_table = &lut->clut_table_data[0];
+
+ for (i = 0; i < num_in_channels; i++) {
+ lut->num_grid_points[i] = read_u8(src, clut_offset + i);
+ }
+
+ // Reverse the processing of transformation elements for mBA type.
+ lut->reversed = (type == LUT_MBA_TYPE);
+
+ lut->num_in_channels = num_in_channels;
+ lut->num_out_channels = num_out_channels;
+
+ if (matrix_offset) {
+ // read the matrix if we have it
+ lut->e00 = read_s15Fixed16Number(src, matrix_offset+4*0);
+ lut->e01 = read_s15Fixed16Number(src, matrix_offset+4*1);
+ lut->e02 = read_s15Fixed16Number(src, matrix_offset+4*2);
+ lut->e10 = read_s15Fixed16Number(src, matrix_offset+4*3);
+ lut->e11 = read_s15Fixed16Number(src, matrix_offset+4*4);
+ lut->e12 = read_s15Fixed16Number(src, matrix_offset+4*5);
+ lut->e20 = read_s15Fixed16Number(src, matrix_offset+4*6);
+ lut->e21 = read_s15Fixed16Number(src, matrix_offset+4*7);
+ lut->e22 = read_s15Fixed16Number(src, matrix_offset+4*8);
+ lut->e03 = read_s15Fixed16Number(src, matrix_offset+4*9);
+ lut->e13 = read_s15Fixed16Number(src, matrix_offset+4*10);
+ lut->e23 = read_s15Fixed16Number(src, matrix_offset+4*11);
+ }
+
+ if (a_curve_offset) {
+ read_nested_curveType(src, &lut->a_curves, num_in_channels, a_curve_offset);
+ }
+ if (m_curve_offset) {
+ read_nested_curveType(src, &lut->m_curves, num_out_channels, m_curve_offset);
+ }
+ if (b_curve_offset) {
+ read_nested_curveType(src, &lut->b_curves, num_out_channels, b_curve_offset);
+ } else {
+ invalid_source(src, "B curves required");
+ }
+
+ if (clut_offset) {
+ clut_precision = read_u8(src, clut_offset + 16);
+ if (clut_precision == 1) {
+ for (i = 0; i < clut_size; i++) {
+ lut->clut_table[i] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + 20 + i*1));
+ }
+ } else if (clut_precision == 2) {
+ for (i = 0; i < clut_size; i++) {
+ lut->clut_table[i] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + 20 + i*2));
+ }
+ } else {
+ invalid_source(src, "Invalid clut precision");
+ }
+ }
+
+ if (!src->valid) {
+ mAB_release(lut);
+ return NULL;
+ }
+
+ return lut;
+}
+
+static struct lutType *read_tag_lutType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
+{
+ struct tag *tag = find_tag(index, tag_id);
+ uint32_t offset = tag->offset;
+ uint32_t type = read_u32(src, offset);
+ 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;
+ uint32_t clut_size;
+ size_t entry_size;
+ struct lutType *lut;
+ int i;
+
+ /* I'm not sure why the spec specifies a fixed number of entries for LUT8 tables even though
+ * they have room for the num_entries fields */
+ if (type == LUT8_TYPE) {
+ num_input_table_entries = 256;
+ num_output_table_entries = 256;
+ entry_size = 1;
+ } else if (type == LUT16_TYPE) {
+ num_input_table_entries = read_u16(src, offset + 48);
+ num_output_table_entries = read_u16(src, offset + 50);
+ entry_size = 2;
+ } else {
+ assert(0); // the caller checks that this doesn't happen
+ invalid_source(src, "Unexpected lut type");
+ return NULL;
+ }
+
+ in_chan = read_u8(src, offset + 8);
+ out_chan = read_u8(src, offset + 9);
+ grid_points = read_u8(src, offset + 10);
+
+ clut_size = pow(grid_points, in_chan);
+ if (clut_size > MAX_CLUT_SIZE) {
+ return NULL;
+ }
+
+ if (in_chan != 3 || out_chan != 3) {
+ return NULL;
+ }
+
+ lut = malloc(sizeof(struct lutType) + (num_input_table_entries * in_chan + clut_size*out_chan + num_output_table_entries * out_chan)*sizeof(float));
+ if (!lut) {
+ return NULL;
+ }
+
+ /* compute the offsets of tables */
+ lut->input_table = &lut->table_data[0];
+ lut->clut_table = &lut->table_data[in_chan*num_input_table_entries];
+ lut->output_table = &lut->table_data[in_chan*num_input_table_entries + clut_size*out_chan];
+
+ lut->num_input_table_entries = num_input_table_entries;
+ lut->num_output_table_entries = num_output_table_entries;
+ lut->num_input_channels = read_u8(src, offset + 8);
+ lut->num_output_channels = read_u8(src, offset + 9);
+ lut->num_clut_grid_points = read_u8(src, offset + 10);
+ lut->e00 = read_s15Fixed16Number(src, offset+12);
+ lut->e01 = read_s15Fixed16Number(src, offset+16);
+ lut->e02 = read_s15Fixed16Number(src, offset+20);
+ lut->e10 = read_s15Fixed16Number(src, offset+24);
+ lut->e11 = read_s15Fixed16Number(src, offset+28);
+ lut->e12 = read_s15Fixed16Number(src, offset+32);
+ lut->e20 = read_s15Fixed16Number(src, offset+36);
+ lut->e21 = read_s15Fixed16Number(src, offset+40);
+ lut->e22 = read_s15Fixed16Number(src, offset+44);
+
+ for (i = 0; i < lut->num_input_table_entries * in_chan; i++) {
+ if (type == LUT8_TYPE) {
+ lut->input_table[i] = uInt8Number_to_float(read_uInt8Number(src, offset + 52 + i * entry_size));
+ } else {
+ lut->input_table[i] = uInt16Number_to_float(read_uInt16Number(src, offset + 52 + i * entry_size));
+ }
+ }
+
+ clut_offset = offset + 52 + lut->num_input_table_entries * in_chan * entry_size;
+ for (i = 0; i < clut_size * out_chan; i+=3) {
+ if (type == LUT8_TYPE) {
+ lut->clut_table[i+0] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + i*entry_size + 0));
+ lut->clut_table[i+1] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + i*entry_size + 1));
+ lut->clut_table[i+2] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + i*entry_size + 2));
+ } else {
+ lut->clut_table[i+0] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + i*entry_size + 0));
+ lut->clut_table[i+1] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + i*entry_size + 2));
+ lut->clut_table[i+2] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + i*entry_size + 4));
+ }
+ }
+
+ output_offset = clut_offset + clut_size * out_chan * entry_size;
+ for (i = 0; i < lut->num_output_table_entries * out_chan; i++) {
+ if (type == LUT8_TYPE) {
+ lut->output_table[i] = uInt8Number_to_float(read_uInt8Number(src, output_offset + i*entry_size));
+ } else {
+ lut->output_table[i] = uInt16Number_to_float(read_uInt16Number(src, output_offset + i*entry_size));
+ }
+ }
+
+ return lut;
+}
+
+static void read_rendering_intent(qcms_profile *profile, struct mem_source *src)
+{
+ profile->rendering_intent = read_u32(src, 64);
+ switch (profile->rendering_intent) {
+ case QCMS_INTENT_PERCEPTUAL:
+ case QCMS_INTENT_SATURATION:
+ case QCMS_INTENT_RELATIVE_COLORIMETRIC:
+ case QCMS_INTENT_ABSOLUTE_COLORIMETRIC:
+ break;
+ default:
+ invalid_source(src, "unknown rendering intent");
+ }
+}
+
+qcms_profile *qcms_profile_create(void)
+{
+ return calloc(sizeof(qcms_profile), 1);
+}
+
+
+
+/* build sRGB gamma table */
+/* based on cmsBuildParametricGamma() */
+static uint16_t *build_sRGB_gamma_table(int num_entries)
+{
+ int i;
+ /* taken from lcms: Build_sRGBGamma() */
+ double gamma = 2.4;
+ double a = 1./1.055;
+ double b = 0.055/1.055;
+ double c = 1./12.92;
+ double d = 0.04045;
+
+ uint16_t *table = malloc(sizeof(uint16_t) * num_entries);
+ if (!table)
+ return NULL;
+
+ for (i=0; i<num_entries; i++) {
+ double x = (double)i / (num_entries-1);
+ double y, output;
+ // IEC 61966-2.1 (sRGB)
+ // Y = (aX + b)^Gamma | X >= d
+ // Y = cX | X < d
+ if (x >= d) {
+ double e = (a*x + b);
+ if (e > 0)
+ y = pow(e, gamma);
+ else
+ y = 0;
+ } else {
+ y = c*x;
+ }
+
+ // Saturate -- this could likely move to a separate function
+ output = y * 65535. + .5;
+ if (output > 65535.)
+ output = 65535;
+ if (output < 0)
+ output = 0;
+ table[i] = (uint16_t)floor(output);
+ }
+ return table;
+}
+
+static struct curveType *curve_from_table(uint16_t *table, int num_entries)
+{
+ struct curveType *curve;
+ int i;
+ curve = malloc(sizeof(struct curveType) + sizeof(uInt16Number)*num_entries);
+ if (!curve)
+ return NULL;
+ curve->type = CURVE_TYPE;
+ curve->count = num_entries;
+ for (i = 0; i < num_entries; i++) {
+ curve->data[i] = table[i];
+ }
+ return curve;
+}
+
+static uint16_t float_to_u8Fixed8Number(float a)
+{
+ if (a > (255.f + 255.f/256))
+ return 0xffff;
+ else if (a < 0.f)
+ return 0;
+ else
+ return floor(a*256.f + .5f);
+}
+
+static struct curveType *curve_from_gamma(float gamma)
+{
+ struct curveType *curve;
+ int num_entries = 1;
+ curve = malloc(sizeof(struct curveType) + sizeof(uInt16Number)*num_entries);
+ if (!curve)
+ return NULL;
+ curve->count = num_entries;
+ curve->data[0] = float_to_u8Fixed8Number(gamma);
+ return curve;
+}
+
+
+//XXX: it would be nice if we had a way of ensuring
+// everything in a profile was initialized regardless of how it was created
+
+//XXX: should this also be taking a black_point?
+/* similar to CGColorSpaceCreateCalibratedRGB */
+qcms_profile* qcms_profile_create_rgb_with_gamma(
+ qcms_CIE_xyY white_point,
+ qcms_CIE_xyYTRIPLE primaries,
+ float gamma)
+{
+ qcms_profile* profile = qcms_profile_create();
+ if (!profile)
+ return NO_MEM_PROFILE;
+
+ //XXX: should store the whitepoint
+ if (!set_rgb_colorants(profile, white_point, primaries)) {
+ qcms_profile_release(profile);
+ return INVALID_PROFILE;
+ }
+
+ profile->redTRC = curve_from_gamma(gamma);
+ profile->blueTRC = curve_from_gamma(gamma);
+ profile->greenTRC = curve_from_gamma(gamma);
+
+ if (!profile->redTRC || !profile->blueTRC || !profile->greenTRC) {
+ qcms_profile_release(profile);
+ return NO_MEM_PROFILE;
+ }
+ profile->class = DISPLAY_DEVICE_PROFILE;
+ profile->rendering_intent = QCMS_INTENT_PERCEPTUAL;
+ profile->color_space = RGB_SIGNATURE;
+ return profile;
+}
+
+qcms_profile* qcms_profile_create_rgb_with_table(
+ qcms_CIE_xyY white_point,
+ qcms_CIE_xyYTRIPLE primaries,
+ uint16_t *table, int num_entries)
+{
+ qcms_profile* profile = qcms_profile_create();
+ if (!profile)
+ return NO_MEM_PROFILE;
+
+ //XXX: should store the whitepoint
+ if (!set_rgb_colorants(profile, white_point, primaries)) {
+ qcms_profile_release(profile);
+ return INVALID_PROFILE;
+ }
+
+ profile->redTRC = curve_from_table(table, num_entries);
+ profile->blueTRC = curve_from_table(table, num_entries);
+ profile->greenTRC = curve_from_table(table, num_entries);
+
+ if (!profile->redTRC || !profile->blueTRC || !profile->greenTRC) {
+ qcms_profile_release(profile);
+ return NO_MEM_PROFILE;
+ }
+ profile->class = DISPLAY_DEVICE_PROFILE;
+ profile->rendering_intent = QCMS_INTENT_PERCEPTUAL;
+ profile->color_space = RGB_SIGNATURE;
+ return profile;
+}
+
+/* from lcms: cmsWhitePointFromTemp */
+/* tempK must be >= 4000. and <= 25000.
+ * similar to argyll: icx_DTEMP2XYZ() */
+static qcms_CIE_xyY white_point_from_temp(int temp_K)
+{
+ qcms_CIE_xyY white_point;
+ double x, y;
+ double T, T2, T3;
+ // double M1, M2;
+
+ // No optimization provided.
+ T = temp_K;
+ T2 = T*T; // Square
+ T3 = T2*T; // Cube
+
+ // For correlated color temperature (T) between 4000K and 7000K:
+ if (T >= 4000. && T <= 7000.) {
+ x = -4.6070*(1E9/T3) + 2.9678*(1E6/T2) + 0.09911*(1E3/T) + 0.244063;
+ } else {
+ // or for correlated color temperature (T) between 7000K and 25000K:
+ if (T > 7000.0 && T <= 25000.0) {
+ x = -2.0064*(1E9/T3) + 1.9018*(1E6/T2) + 0.24748*(1E3/T) + 0.237040;
+ } else {
+ assert(0 && "invalid temp");
+ }
+ }
+
+ // Obtain y(x)
+
+ y = -3.000*(x*x) + 2.870*x - 0.275;
+
+ // wave factors (not used, but here for futures extensions)
+
+ // M1 = (-1.3515 - 1.7703*x + 5.9114 *y)/(0.0241 + 0.2562*x - 0.7341*y);
+ // M2 = (0.0300 - 31.4424*x + 30.0717*y)/(0.0241 + 0.2562*x - 0.7341*y);
+
+ // Fill white_point struct
+ white_point.x = x;
+ white_point.y = y;
+ white_point.Y = 1.0;
+
+ return white_point;
+}
+
+qcms_profile* qcms_profile_sRGB(void)
+{
+ qcms_profile *profile;
+ uint16_t *table;
+
+ qcms_CIE_xyYTRIPLE Rec709Primaries = {
+ {0.6400, 0.3300, 1.0},
+ {0.3000, 0.6000, 1.0},
+ {0.1500, 0.0600, 1.0}
+ };
+ qcms_CIE_xyY D65;
+
+ D65 = white_point_from_temp(6504);
+
+ table = build_sRGB_gamma_table(1024);
+
+ if (!table)
+ return NO_MEM_PROFILE;
+
+ profile = qcms_profile_create_rgb_with_table(D65, Rec709Primaries, table, 1024);
+ free(table);
+ return profile;
+}
+
+
+/* qcms_profile_from_memory does not hold a reference to the memory passed in */
+qcms_profile* qcms_profile_from_memory(const void *mem, size_t size)
+{
+ uint32_t length;
+ struct mem_source source;
+ struct mem_source *src = &source;
+ struct tag_index index;
+ qcms_profile *profile;
+
+ source.buf = mem;
+ source.size = size;
+ source.valid = true;
+
+ length = read_u32(src, 0);
+ if (length <= size) {
+ // shrink the area that we can read if appropriate
+ source.size = length;
+ } else {
+ return INVALID_PROFILE;
+ }
+
+ /* ensure that the profile size is sane so it's easier to reason about */
+ if (source.size <= 64 || source.size >= MAX_PROFILE_SIZE)
+ return INVALID_PROFILE;
+
+ profile = qcms_profile_create();
+ if (!profile)
+ return NO_MEM_PROFILE;
+
+ check_CMM_type_signature(src);
+ check_profile_version(src);
+ read_class_signature(profile, src);
+ read_rendering_intent(profile, src);
+ read_color_space(profile, src);
+ read_pcs(profile, src);
+ //TODO read rest of profile stuff
+
+ if (!src->valid)
+ goto invalid_profile;
+
+ index = read_tag_table(profile, src);
+ if (!src->valid || !index.tags)
+ goto invalid_tag_table;
+
+ if (find_tag(index, TAG_CHAD)) {
+ profile->chromaticAdaption = read_tag_s15Fixed16ArrayType(src, index, TAG_CHAD);
+ } else {
+ profile->chromaticAdaption.invalid = true; //Signal the data is not present
+ }
+
+ if (profile->class == DISPLAY_DEVICE_PROFILE || profile->class == INPUT_DEVICE_PROFILE ||
+ profile->class == OUTPUT_DEVICE_PROFILE || profile->class == COLOR_SPACE_PROFILE) {
+ if (profile->color_space == RGB_SIGNATURE) {
+ if (find_tag(index, TAG_A2B0)) {
+ if (read_u32(src, find_tag(index, TAG_A2B0)->offset) == LUT8_TYPE ||
+ read_u32(src, find_tag(index, TAG_A2B0)->offset) == LUT16_TYPE) {
+ profile->A2B0 = read_tag_lutType(src, index, TAG_A2B0);
+ } else if (read_u32(src, find_tag(index, TAG_A2B0)->offset) == LUT_MAB_TYPE) {
+ profile->mAB = read_tag_lutmABType(src, index, TAG_A2B0);
+ }
+ }
+ if (find_tag(index, TAG_B2A0)) {
+ if (read_u32(src, find_tag(index, TAG_B2A0)->offset) == LUT8_TYPE ||
+ read_u32(src, find_tag(index, TAG_B2A0)->offset) == LUT16_TYPE) {
+ profile->B2A0 = read_tag_lutType(src, index, TAG_B2A0);
+ } else if (read_u32(src, find_tag(index, TAG_B2A0)->offset) == LUT_MBA_TYPE) {
+ profile->mBA = read_tag_lutmABType(src, index, TAG_B2A0);
+ }
+ }
+ if (find_tag(index, TAG_rXYZ) || !qcms_supports_iccv4) {
+ profile->redColorant = read_tag_XYZType(src, index, TAG_rXYZ);
+ profile->greenColorant = read_tag_XYZType(src, index, TAG_gXYZ);
+ profile->blueColorant = read_tag_XYZType(src, index, TAG_bXYZ);
+ }
+
+ if (!src->valid)
+ goto invalid_tag_table;
+
+ if (find_tag(index, TAG_rTRC) || !qcms_supports_iccv4) {
+ profile->redTRC = read_tag_curveType(src, index, TAG_rTRC);
+ profile->greenTRC = read_tag_curveType(src, index, TAG_gTRC);
+ profile->blueTRC = read_tag_curveType(src, index, TAG_bTRC);
+
+ if (!profile->redTRC || !profile->blueTRC || !profile->greenTRC)
+ goto invalid_tag_table;
+ }
+ } else if (profile->color_space == GRAY_SIGNATURE) {
+
+ profile->grayTRC = read_tag_curveType(src, index, TAG_kTRC);
+ if (!profile->grayTRC)
+ goto invalid_tag_table;
+
+ } else {
+ assert(0 && "read_color_space protects against entering here");
+ goto invalid_tag_table;
+ }
+ } else {
+ goto invalid_tag_table;
+ }
+
+ if (!src->valid)
+ goto invalid_tag_table;
+
+ free(index.tags);
+
+ return profile;
+
+invalid_tag_table:
+ free(index.tags);
+invalid_profile:
+ qcms_profile_release(profile);
+ return INVALID_PROFILE;
+}
+
+qcms_intent qcms_profile_get_rendering_intent(qcms_profile *profile)
+{
+ return profile->rendering_intent;
+}
+
+icColorSpaceSignature
+qcms_profile_get_color_space(qcms_profile *profile)
+{
+ return profile->color_space;
+}
+
+static void lut_release(struct lutType *lut)
+{
+ free(lut);
+}
+
+void qcms_profile_release(qcms_profile *profile)
+{
+ if (profile->output_table_r)
+ precache_release(profile->output_table_r);
+ if (profile->output_table_g)
+ precache_release(profile->output_table_g);
+ if (profile->output_table_b)
+ precache_release(profile->output_table_b);
+
+ if (profile->A2B0)
+ lut_release(profile->A2B0);
+ if (profile->B2A0)
+ lut_release(profile->B2A0);
+
+ if (profile->mAB)
+ mAB_release(profile->mAB);
+ if (profile->mBA)
+ mAB_release(profile->mBA);
+
+ free(profile->redTRC);
+ free(profile->blueTRC);
+ free(profile->greenTRC);
+ free(profile->grayTRC);
+ free(profile);
+}
+
+
+#include <stdio.h>
+qcms_profile* qcms_profile_from_file(FILE *file)
+{
+ uint32_t length, remaining_length;
+ qcms_profile *profile;
+ size_t read_length;
+ be32 length_be;
+ void *data;
+
+ if (fread(&length_be, 1, sizeof(length_be), file) != sizeof(length_be))
+ return BAD_VALUE_PROFILE;
+
+ length = be32_to_cpu(length_be);
+ if (length > MAX_PROFILE_SIZE || length < sizeof(length_be))
+ return BAD_VALUE_PROFILE;
+
+ /* allocate room for the entire profile */
+ data = malloc(length);
+ if (!data)
+ return NO_MEM_PROFILE;
+
+ /* copy in length to the front so that the buffer will contain the entire profile */
+ *((be32*)data) = length_be;
+ remaining_length = length - sizeof(length_be);
+
+ /* read the rest profile */
+ read_length = fread((unsigned char*)data + sizeof(length_be), 1, remaining_length, file);
+ if (read_length != remaining_length) {
+ free(data);
+ return INVALID_PROFILE;
+ }
+
+ profile = qcms_profile_from_memory(data, length);
+ free(data);
+ return profile;
+}
+
+qcms_profile* qcms_profile_from_path(const char *path)
+{
+ qcms_profile *profile = NULL;
+ FILE *file = fopen(path, "rb");
+ if (file) {
+ profile = qcms_profile_from_file(file);
+ fclose(file);
+ }
+ return profile;
+}
+
+#ifdef _WIN32
+/* Unicode path version */
+qcms_profile* qcms_profile_from_unicode_path(const wchar_t *path)
+{
+ qcms_profile *profile = NULL;
+ FILE *file = _wfopen(path, L"rb");
+ if (file) {
+ profile = qcms_profile_from_file(file);
+ fclose(file);
+ }
+ return profile;
+}
+#endif
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