The Tor Browser: gfx/qcms/transform-altivec.c@97036ab72558 (annotated)

gfx/qcms/transform-altivec.c@97036ab72558 (annotated)

gfx/qcms/transform-altivec.c

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* vim: set ts=8 sw=8 noexpandtab: */
 //  qcms
 //  Copyright (C) 2009 Mozilla Corporation
 //  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 <altivec.h>
 #include "qcmsint.h"
 #define FLOATSCALE (float)(PRECACHE_OUTPUT_SIZE)
 #define CLAMPMAXVAL (((float) (PRECACHE_OUTPUT_SIZE - 1)) / PRECACHE_OUTPUT_SIZE)
 static const ALIGN float floatScaleX4 = FLOATSCALE;
 static const ALIGN float clampMaxValueX4 = CLAMPMAXVAL;
 inline vector float load_aligned_float(float *dataPtr)
 {
 	vector float data = vec_lde(0, dataPtr);
 	vector unsigned char moveToStart = vec_lvsl(0, dataPtr);
 	return vec_perm(data, data, moveToStart);
 }
 void qcms_transform_data_rgb_out_lut_altivec(qcms_transform *transform,
                                              unsigned char *src,
                                              unsigned char *dest,
                                              size_t length)
 {
 	unsigned int i;
 	float (*mat)[4] = transform->matrix;
 	char input_back[32];
 	/* Ensure we have a buffer that's 16 byte aligned regardless of the original
 	 * stack alignment. We can't use __attribute__((aligned(16))) or __declspec(align(32))
 	 * because they don't work on stack variables. gcc 4.4 does do the right thing
 	 * on x86 but that's too new for us right now. For more info: gcc bug #16660 */
 	float const *input = (float*)(((uintptr_t)&input_back[16]) & ~0xf);
 	/* share input and output locations to save having to keep the
  	 * locations in separate registers */
 	uint32_t const *output = (uint32_t*)input;
 	/* deref *transform now to avoid it in loop */
 	const float *igtbl_r = transform->input_gamma_table_r;
 	const float *igtbl_g = transform->input_gamma_table_g;
 	const float *igtbl_b = transform->input_gamma_table_b;
 	/* deref *transform now to avoid it in loop */
 	const uint8_t *otdata_r = &transform->output_table_r->data[0];
 	const uint8_t *otdata_g = &transform->output_table_g->data[0];
 	const uint8_t *otdata_b = &transform->output_table_b->data[0];
 	/* input matrix values never change */
 	const vector float mat0 = vec_ldl(0, (vector float*)mat[0]);
 	const vector float mat1 = vec_ldl(0, (vector float*)mat[1]);
 	const vector float mat2 = vec_ldl(0, (vector float*)mat[2]);
 	/* these values don't change, either */
 	const vector float max = vec_splat(vec_lde(0, (float*)&clampMaxValueX4), 0);
 	const vector float min = (vector float)vec_splat_u32(0);
 	const vector float scale = vec_splat(vec_lde(0, (float*)&floatScaleX4), 0);
 	/* working variables */
 	vector float vec_r, vec_g, vec_b, result;
 	/* CYA */
 	if (!length)
 		return;
 	/* one pixel is handled outside of the loop */
 	length--;
 	/* setup for transforming 1st pixel */
 	vec_r = load_aligned_float((float*)&igtbl_r[src[0]]);
 	vec_g = load_aligned_float((float*)&igtbl_r[src[1]]);
 	vec_b = load_aligned_float((float*)&igtbl_r[src[2]]);
 	src += 3;
 	/* transform all but final pixel */
 	for (i=0; i<length; i++)
 	{
 		/* position values from gamma tables */
 		vec_r = vec_splat(vec_r, 0);
 		vec_g = vec_splat(vec_g, 0);
 		vec_b = vec_splat(vec_b, 0);
 		/* gamma * matrix */
 		vec_r = vec_madd(vec_r, mat0, min);
 		vec_g = vec_madd(vec_g, mat1, min);
 		vec_b = vec_madd(vec_b, mat2, min);
 		/* crunch, crunch, crunch */
 		vec_r = vec_add(vec_r, vec_add(vec_g, vec_b));
 		vec_r = vec_max(min, vec_r);
 		vec_r = vec_min(max, vec_r);
 		result = vec_madd(vec_r, scale, min);
 		/* store calc'd output tables indices */
 		vec_st(vec_ctu(vec_round(result), 0), 0, (vector unsigned int*)output);
 		/* load for next loop while store completes */
 		vec_r = load_aligned_float((float*)&igtbl_r[src[0]]);
 		vec_g = load_aligned_float((float*)&igtbl_r[src[1]]);
 		vec_b = load_aligned_float((float*)&igtbl_r[src[2]]);
 		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 += 3;
 	}
 	/* handle final (maybe only) pixel */
 	vec_r = vec_splat(vec_r, 0);
 	vec_g = vec_splat(vec_g, 0);
 	vec_b = vec_splat(vec_b, 0);
 	vec_r = vec_madd(vec_r, mat0, min);
 	vec_g = vec_madd(vec_g, mat1, min);
 	vec_b = vec_madd(vec_b, mat2, min);
 	vec_r = vec_add(vec_r, vec_add(vec_g, vec_b));
 	vec_r = vec_max(min, vec_r);
 	vec_r = vec_min(max, vec_r);
 	result = vec_madd(vec_r, scale, min);
 	vec_st(vec_ctu(vec_round(result),0),0,(vector unsigned int*)output);
 	dest[0] = otdata_r[output[0]];
 	dest[1] = otdata_g[output[1]];
 	dest[2] = otdata_b[output[2]];
 }
 void qcms_transform_data_rgba_out_lut_altivec(qcms_transform *transform,
                                               unsigned char *src,
                                               unsigned char *dest,
                                               size_t length)
 {
 	unsigned int i;
 	float (*mat)[4] = transform->matrix;
 	char input_back[32];
 	/* Ensure we have a buffer that's 16 byte aligned regardless of the original
 	 * stack alignment. We can't use __attribute__((aligned(16))) or __declspec(align(32))
 	 * because they don't work on stack variables. gcc 4.4 does do the right thing
 	 * on x86 but that's too new for us right now. For more info: gcc bug #16660 */
 	float const *input = (float*)(((uintptr_t)&input_back[16]) & ~0xf);
 	/* share input and output locations to save having to keep the
 	 * locations in separate registers */
 	uint32_t const *output = (uint32_t*)input;
 	/* deref *transform now to avoid it in loop */
 	const float *igtbl_r = transform->input_gamma_table_r;
 	const float *igtbl_g = transform->input_gamma_table_g;
 	const float *igtbl_b = transform->input_gamma_table_b;
 	/* deref *transform now to avoid it in loop */
 	const uint8_t *otdata_r = &transform->output_table_r->data[0];
 	const uint8_t *otdata_g = &transform->output_table_g->data[0];
 	const uint8_t *otdata_b = &transform->output_table_b->data[0];
 	/* input matrix values never change */
 	const vector float mat0 = vec_ldl(0, (vector float*)mat[0]);
 	const vector float mat1 = vec_ldl(0, (vector float*)mat[1]);
 	const vector float mat2 = vec_ldl(0, (vector float*)mat[2]);
 	/* these values don't change, either */
 	const vector float max = vec_splat(vec_lde(0, (float*)&clampMaxValueX4), 0);
 	const vector float min = (vector float)vec_splat_u32(0);
 	const vector float scale = vec_splat(vec_lde(0, (float*)&floatScaleX4), 0);
 	/* working variables */
 	vector float vec_r, vec_g, vec_b, result;
 	unsigned char alpha;
 	/* CYA */
 	if (!length)
 		return;
 	/* one pixel is handled outside of the loop */
 	length--;
 	/* setup for transforming 1st pixel */
 	vec_r = load_aligned_float((float*)&igtbl_r[src[0]]);
 	vec_g = load_aligned_float((float*)&igtbl_r[src[1]]);
 	vec_b = load_aligned_float((float*)&igtbl_r[src[2]]);
 	alpha = src[3];
 	src += 4;
 	/* transform all but final pixel */
 	for (i=0; i<length; i++)
 	{
 		/* position values from gamma tables */
 		vec_r = vec_splat(vec_r, 0);
 		vec_g = vec_splat(vec_g, 0);
 		vec_b = vec_splat(vec_b, 0);
 		/* gamma * matrix */
 		vec_r = vec_madd(vec_r, mat0, min);
 		vec_g = vec_madd(vec_g, mat1, min);
 		vec_b = vec_madd(vec_b, mat2, min);
 		/* store alpha for this pixel; load alpha for next */
 		dest[3] = alpha;
 		alpha = src[3];
 		/* crunch, crunch, crunch */
 		vec_r = vec_add(vec_r, vec_add(vec_g, vec_b));
 		vec_r = vec_max(min, vec_r);
 		vec_r = vec_min(max, vec_r);
 		result = vec_madd(vec_r, scale, min);
 		/* store calc'd output tables indices */
 		vec_st(vec_ctu(vec_round(result), 0), 0, (vector unsigned int*)output);
 		/* load gamma values for next loop while store completes */
 		vec_r = load_aligned_float((float*)&igtbl_r[src[0]]);
 		vec_g = load_aligned_float((float*)&igtbl_r[src[1]]);
 		vec_b = load_aligned_float((float*)&igtbl_r[src[2]]);
 		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 += 4;
 	}
 	/* handle final (maybe only) pixel */
 	vec_r = vec_splat(vec_r, 0);
 	vec_g = vec_splat(vec_g, 0);
 	vec_b = vec_splat(vec_b, 0);
 	vec_r = vec_madd(vec_r, mat0, min);
 	vec_g = vec_madd(vec_g, mat1, min);
 	vec_b = vec_madd(vec_b, mat2, min);
 	dest[3] = alpha;
 	vec_r = vec_add(vec_r, vec_add(vec_g, vec_b));
 	vec_r = vec_max(min, vec_r);
 	vec_r = vec_min(max, vec_r);
 	result = vec_madd(vec_r, scale, min);
 	vec_st(vec_ctu(vec_round(result), 0), 0, (vector unsigned int*)output);
 	dest[0] = otdata_r[output[0]];
 	dest[1] = otdata_g[output[1]];
 	dest[2] = otdata_b[output[2]];
 }

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gfx/qcms/transform-altivec.c@97036ab72558 (annotated)

gfx/qcms/transform-altivec.c