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alpha_processing*: use WEBP_RESTRICT qualifier

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this helps both auto-vectorization in the C code and the optimized code
generation

Change-Id: Ide570d6be45125ffef7248bdc40e9eb08f00e832
This commit is contained in:
James Zern
2021-07-03 17:43:11 -07:00
parent a2e18f10eb
commit a1e5dae0f0
4 changed files with 54 additions and 37 deletions
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39
src/dsp/alpha_processing.c
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@ -13,6 +13,7 @@
#include <assert.h>
#include "src/dsp/dsp.h"
#include "src/utils/utils.h"
// Tables can be faster on some platform but incur some extra binary size (~2k).
#if !defined(USE_TABLES_FOR_ALPHA_MULT)
@ -157,7 +158,8 @@ void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse) {
}
}
void WebPMultRow_C(uint8_t* const ptr, const uint8_t* const alpha,
void WebPMultRow_C(uint8_t* WEBP_RESTRICT const ptr,
const uint8_t* WEBP_RESTRICT const alpha,
int width, int inverse) {
int x;
for (x = 0; x < width; ++x) {
@ -193,8 +195,8 @@ void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows,
}
}
void WebPMultRows(uint8_t* ptr, int stride,
const uint8_t* alpha, int alpha_stride,
void WebPMultRows(uint8_t* WEBP_RESTRICT ptr, int stride,
const uint8_t* WEBP_RESTRICT alpha, int alpha_stride,
int width, int num_rows, int inverse) {
int n;
for (n = 0; n < num_rows; ++n) {
@ -290,9 +292,9 @@ static void ApplyAlphaMultiply_16b_C(uint8_t* rgba4444,
}
#if !WEBP_NEON_OMIT_C_CODE
static int DispatchAlpha_C(const uint8_t* alpha, int alpha_stride,
static int DispatchAlpha_C(const uint8_t* WEBP_RESTRICT alpha, int alpha_stride,
int width, int height,
uint8_t* dst, int dst_stride) {
uint8_t* WEBP_RESTRICT dst, int dst_stride) {
uint32_t alpha_mask = 0xff;
int i, j;
@ -309,9 +311,10 @@ static int DispatchAlpha_C(const uint8_t* alpha, int alpha_stride,
return (alpha_mask != 0xff);
}
static void DispatchAlphaToGreen_C(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint32_t* dst, int dst_stride) {
static void DispatchAlphaToGreen_C(const uint8_t* WEBP_RESTRICT alpha,
int alpha_stride, int width, int height,
uint32_t* WEBP_RESTRICT dst,
int dst_stride) {
int i, j;
for (j = 0; j < height; ++j) {
for (i = 0; i < width; ++i) {
@ -322,9 +325,9 @@ static void DispatchAlphaToGreen_C(const uint8_t* alpha, int alpha_stride,
}
}
static int ExtractAlpha_C(const uint8_t* argb, int argb_stride,
static int ExtractAlpha_C(const uint8_t* WEBP_RESTRICT argb, int argb_stride,
int width, int height,
uint8_t* alpha, int alpha_stride) {
uint8_t* WEBP_RESTRICT alpha, int alpha_stride) {
uint8_t alpha_mask = 0xff;
int i, j;
@ -340,7 +343,8 @@ static int ExtractAlpha_C(const uint8_t* argb, int argb_stride,
return (alpha_mask == 0xff);
}
static void ExtractGreen_C(const uint32_t* argb, uint8_t* alpha, int size) {
static void ExtractGreen_C(const uint32_t* WEBP_RESTRICT argb,
uint8_t* WEBP_RESTRICT alpha, int size) {
int i;
for (i = 0; i < size; ++i) alpha[i] = argb[i] >> 8;
}
@ -372,8 +376,11 @@ static WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) {
}
#ifdef WORDS_BIGENDIAN
static void PackARGB_C(const uint8_t* a, const uint8_t* r, const uint8_t* g,
const uint8_t* b, int len, uint32_t* out) {
static void PackARGB_C(const uint8_t* WEBP_RESTRICT a,
const uint8_t* WEBP_RESTRICT r,
const uint8_t* WEBP_RESTRICT g,
const uint8_t* WEBP_RESTRICT b,
int len, uint32_t* WEBP_RESTRICT out) {
int i;
for (i = 0; i < len; ++i) {
out[i] = MakeARGB32(a[4 * i], r[4 * i], g[4 * i], b[4 * i]);
@ -381,8 +388,10 @@ static void PackARGB_C(const uint8_t* a, const uint8_t* r, const uint8_t* g,
}
#endif
static void PackRGB_C(const uint8_t* r, const uint8_t* g, const uint8_t* b,
int len, int step, uint32_t* out) {
static void PackRGB_C(const uint8_t* WEBP_RESTRICT r,
const uint8_t* WEBP_RESTRICT g,
const uint8_t* WEBP_RESTRICT b,
int len, int step, uint32_t* WEBP_RESTRICT out) {
int i, offset = 0;
for (i = 0; i < len; ++i) {
out[i] = MakeARGB32(0xff, r[offset], g[offset], b[offset]);