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+// Copyright 2010 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Speed-critical decoding functions, default plain-C implementations.
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include "./dsp.h"
+#include "../dec/vp8i_dec.h"
+#include "../utils/utils.h"
+
+//------------------------------------------------------------------------------
+
+static WEBP_INLINE uint8_t clip_8b(int v) {
+ return (!(v & ~0xff)) ? v : (v < 0) ? 0 : 255;
+}
+
+//------------------------------------------------------------------------------
+// Transforms (Paragraph 14.4)
+
+#define STORE(x, y, v) \
+ dst[x + y * BPS] = clip_8b(dst[x + y * BPS] + ((v) >> 3))
+
+#define STORE2(y, dc, d, c) do { \
+ const int DC = (dc); \
+ STORE(0, y, DC + (d)); \
+ STORE(1, y, DC + (c)); \
+ STORE(2, y, DC - (c)); \
+ STORE(3, y, DC - (d)); \
+} while (0)
+
+#define MUL1(a) ((((a) * 20091) >> 16) + (a))
+#define MUL2(a) (((a) * 35468) >> 16)
+
+static void TransformOne(const int16_t* in, uint8_t* dst) {
+ int C[4 * 4], *tmp;
+ int i;
+ tmp = C;
+ for (i = 0; i < 4; ++i) { // vertical pass
+ const int a = in[0] + in[8]; // [-4096, 4094]
+ const int b = in[0] - in[8]; // [-4095, 4095]
+ const int c = MUL2(in[4]) - MUL1(in[12]); // [-3783, 3783]
+ const int d = MUL1(in[4]) + MUL2(in[12]); // [-3785, 3781]
+ tmp[0] = a + d; // [-7881, 7875]
+ tmp[1] = b + c; // [-7878, 7878]
+ tmp[2] = b - c; // [-7878, 7878]
+ tmp[3] = a - d; // [-7877, 7879]
+ tmp += 4;
+ in++;
+ }
+ // Each pass is expanding the dynamic range by ~3.85 (upper bound).
+ // The exact value is (2. + (20091 + 35468) / 65536).
+ // After the second pass, maximum interval is [-3794, 3794], assuming
+ // an input in [-2048, 2047] interval. We then need to add a dst value
+ // in the [0, 255] range.
+ // In the worst case scenario, the input to clip_8b() can be as large as
+ // [-60713, 60968].
+ tmp = C;
+ for (i = 0; i < 4; ++i) { // horizontal pass
+ const int dc = tmp[0] + 4;
+ const int a = dc + tmp[8];
+ const int b = dc - tmp[8];
+ const int c = MUL2(tmp[4]) - MUL1(tmp[12]);
+ const int d = MUL1(tmp[4]) + MUL2(tmp[12]);
+ STORE(0, 0, a + d);
+ STORE(1, 0, b + c);
+ STORE(2, 0, b - c);
+ STORE(3, 0, a - d);
+ tmp++;
+ dst += BPS;
+ }
+}
+
+// Simplified transform when only in[0], in[1] and in[4] are non-zero
+static void TransformAC3(const int16_t* in, uint8_t* dst) {
+ const int a = in[0] + 4;
+ const int c4 = MUL2(in[4]);
+ const int d4 = MUL1(in[4]);
+ const int c1 = MUL2(in[1]);
+ const int d1 = MUL1(in[1]);
+ STORE2(0, a + d4, d1, c1);
+ STORE2(1, a + c4, d1, c1);
+ STORE2(2, a - c4, d1, c1);
+ STORE2(3, a - d4, d1, c1);
+}
+#undef MUL1
+#undef MUL2
+#undef STORE2
+
+static void TransformTwo(const int16_t* in, uint8_t* dst, int do_two) {
+ TransformOne(in, dst);
+ if (do_two) {
+ TransformOne(in + 16, dst + 4);
+ }
+}
+
+static void TransformUV(const int16_t* in, uint8_t* dst) {
+ VP8Transform(in + 0 * 16, dst, 1);
+ VP8Transform(in + 2 * 16, dst + 4 * BPS, 1);
+}
+
+static void TransformDC(const int16_t* in, uint8_t* dst) {
+ const int DC = in[0] + 4;
+ int i, j;
+ for (j = 0; j < 4; ++j) {
+ for (i = 0; i < 4; ++i) {
+ STORE(i, j, DC);
+ }
+ }
+}
+
+static void TransformDCUV(const int16_t* in, uint8_t* dst) {
+ if (in[0 * 16]) VP8TransformDC(in + 0 * 16, dst);
+ if (in[1 * 16]) VP8TransformDC(in + 1 * 16, dst + 4);
+ if (in[2 * 16]) VP8TransformDC(in + 2 * 16, dst + 4 * BPS);
+ if (in[3 * 16]) VP8TransformDC(in + 3 * 16, dst + 4 * BPS + 4);
+}
+
+#undef STORE
+
+//------------------------------------------------------------------------------
+// Paragraph 14.3
+
+static void TransformWHT(const int16_t* in, int16_t* out) {
+ int tmp[16];
+ int i;
+ for (i = 0; i < 4; ++i) {
+ const int a0 = in[0 + i] + in[12 + i];
+ const int a1 = in[4 + i] + in[ 8 + i];
+ const int a2 = in[4 + i] - in[ 8 + i];
+ const int a3 = in[0 + i] - in[12 + i];
+ tmp[0 + i] = a0 + a1;
+ tmp[8 + i] = a0 - a1;
+ tmp[4 + i] = a3 + a2;
+ tmp[12 + i] = a3 - a2;
+ }
+ for (i = 0; i < 4; ++i) {
+ const int dc = tmp[0 + i * 4] + 3; // w/ rounder
+ const int a0 = dc + tmp[3 + i * 4];
+ const int a1 = tmp[1 + i * 4] + tmp[2 + i * 4];
+ const int a2 = tmp[1 + i * 4] - tmp[2 + i * 4];
+ const int a3 = dc - tmp[3 + i * 4];
+ out[ 0] = (a0 + a1) >> 3;
+ out[16] = (a3 + a2) >> 3;
+ out[32] = (a0 - a1) >> 3;
+ out[48] = (a3 - a2) >> 3;
+ out += 64;
+ }
+}
+
+void (*VP8TransformWHT)(const int16_t* in, int16_t* out);
+
+//------------------------------------------------------------------------------
+// Intra predictions
+
+#define DST(x, y) dst[(x) + (y) * BPS]
+
+static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
+ const uint8_t* top = dst - BPS;
+ const uint8_t* const clip0 = VP8kclip1 - top[-1];
+ int y;
+ for (y = 0; y < size; ++y) {
+ const uint8_t* const clip = clip0 + dst[-1];
+ int x;
+ for (x = 0; x < size; ++x) {
+ dst[x] = clip[top[x]];
+ }
+ dst += BPS;
+ }
+}
+static void TM4(uint8_t* dst) { TrueMotion(dst, 4); }
+static void TM8uv(uint8_t* dst) { TrueMotion(dst, 8); }
+static void TM16(uint8_t* dst) { TrueMotion(dst, 16); }
+
+//------------------------------------------------------------------------------
+// 16x16
+
+static void VE16(uint8_t* dst) { // vertical
+ int j;
+ for (j = 0; j < 16; ++j) {
+ memcpy(dst + j * BPS, dst - BPS, 16);
+ }
+}
+
+static void HE16(uint8_t* dst) { // horizontal
+ int j;
+ for (j = 16; j > 0; --j) {
+ memset(dst, dst[-1], 16);
+ dst += BPS;
+ }
+}
+
+static WEBP_INLINE void Put16(int v, uint8_t* dst) {
+ int j;
+ for (j = 0; j < 16; ++j) {
+ memset(dst + j * BPS, v, 16);
+ }
+}
+
+static void DC16(uint8_t* dst) { // DC
+ int DC = 16;
+ int j;
+ for (j = 0; j < 16; ++j) {
+ DC += dst[-1 + j * BPS] + dst[j - BPS];
+ }
+ Put16(DC >> 5, dst);
+}
+
+static void DC16NoTop(uint8_t* dst) { // DC with top samples not available
+ int DC = 8;
+ int j;
+ for (j = 0; j < 16; ++j) {
+ DC += dst[-1 + j * BPS];
+ }
+ Put16(DC >> 4, dst);
+}
+
+static void DC16NoLeft(uint8_t* dst) { // DC with left samples not available
+ int DC = 8;
+ int i;
+ for (i = 0; i < 16; ++i) {
+ DC += dst[i - BPS];
+ }
+ Put16(DC >> 4, dst);
+}
+
+static void DC16NoTopLeft(uint8_t* dst) { // DC with no top and left samples
+ Put16(0x80, dst);
+}
+
+VP8PredFunc VP8PredLuma16[NUM_B_DC_MODES];
+
+//------------------------------------------------------------------------------
+// 4x4
+
+#define AVG3(a, b, c) ((uint8_t)(((a) + 2 * (b) + (c) + 2) >> 2))
+#define AVG2(a, b) (((a) + (b) + 1) >> 1)
+
+static void VE4(uint8_t* dst) { // vertical
+ const uint8_t* top = dst - BPS;
+ const uint8_t vals[4] = {
+ AVG3(top[-1], top[0], top[1]),
+ AVG3(top[ 0], top[1], top[2]),
+ AVG3(top[ 1], top[2], top[3]),
+ AVG3(top[ 2], top[3], top[4])
+ };
+ int i;
+ for (i = 0; i < 4; ++i) {
+ memcpy(dst + i * BPS, vals, sizeof(vals));
+ }
+}
+
+static void HE4(uint8_t* dst) { // horizontal
+ const int A = dst[-1 - BPS];
+ const int B = dst[-1];
+ const int C = dst[-1 + BPS];
+ const int D = dst[-1 + 2 * BPS];
+ const int E = dst[-1 + 3 * BPS];
+ WebPUint32ToMem(dst + 0 * BPS, 0x01010101U * AVG3(A, B, C));
+ WebPUint32ToMem(dst + 1 * BPS, 0x01010101U * AVG3(B, C, D));
+ WebPUint32ToMem(dst + 2 * BPS, 0x01010101U * AVG3(C, D, E));
+ WebPUint32ToMem(dst + 3 * BPS, 0x01010101U * AVG3(D, E, E));
+}
+
+static void DC4(uint8_t* dst) { // DC
+ uint32_t dc = 4;
+ int i;
+ for (i = 0; i < 4; ++i) dc += dst[i - BPS] + dst[-1 + i * BPS];
+ dc >>= 3;
+ for (i = 0; i < 4; ++i) memset(dst + i * BPS, dc, 4);
+}
+
+static void RD4(uint8_t* dst) { // Down-right
+ const int I = dst[-1 + 0 * BPS];
+ const int J = dst[-1 + 1 * BPS];
+ const int K = dst[-1 + 2 * BPS];
+ const int L = dst[-1 + 3 * BPS];
+ const int X = dst[-1 - BPS];
+ const int A = dst[0 - BPS];
+ const int B = dst[1 - BPS];
+ const int C = dst[2 - BPS];
+ const int D = dst[3 - BPS];
+ DST(0, 3) = AVG3(J, K, L);
+ DST(1, 3) = DST(0, 2) = AVG3(I, J, K);
+ DST(2, 3) = DST(1, 2) = DST(0, 1) = AVG3(X, I, J);
+ DST(3, 3) = DST(2, 2) = DST(1, 1) = DST(0, 0) = AVG3(A, X, I);
+ DST(3, 2) = DST(2, 1) = DST(1, 0) = AVG3(B, A, X);
+ DST(3, 1) = DST(2, 0) = AVG3(C, B, A);
+ DST(3, 0) = AVG3(D, C, B);
+}
+
+static void LD4(uint8_t* dst) { // Down-Left
+ const int A = dst[0 - BPS];
+ const int B = dst[1 - BPS];
+ const int C = dst[2 - BPS];
+ const int D = dst[3 - BPS];
+ const int E = dst[4 - BPS];
+ const int F = dst[5 - BPS];
+ const int G = dst[6 - BPS];
+ const int H = dst[7 - BPS];
+ DST(0, 0) = AVG3(A, B, C);
+ DST(1, 0) = DST(0, 1) = AVG3(B, C, D);
+ DST(2, 0) = DST(1, 1) = DST(0, 2) = AVG3(C, D, E);
+ DST(3, 0) = DST(2, 1) = DST(1, 2) = DST(0, 3) = AVG3(D, E, F);
+ DST(3, 1) = DST(2, 2) = DST(1, 3) = AVG3(E, F, G);
+ DST(3, 2) = DST(2, 3) = AVG3(F, G, H);
+ DST(3, 3) = AVG3(G, H, H);
+}
+
+static void VR4(uint8_t* dst) { // Vertical-Right
+ const int I = dst[-1 + 0 * BPS];
+ const int J = dst[-1 + 1 * BPS];
+ const int K = dst[-1 + 2 * BPS];
+ const int X = dst[-1 - BPS];
+ const int A = dst[0 - BPS];
+ const int B = dst[1 - BPS];
+ const int C = dst[2 - BPS];
+ const int D = dst[3 - BPS];
+ DST(0, 0) = DST(1, 2) = AVG2(X, A);
+ DST(1, 0) = DST(2, 2) = AVG2(A, B);
+ DST(2, 0) = DST(3, 2) = AVG2(B, C);
+ DST(3, 0) = AVG2(C, D);
+
+ DST(0, 3) = AVG3(K, J, I);
+ DST(0, 2) = AVG3(J, I, X);
+ DST(0, 1) = DST(1, 3) = AVG3(I, X, A);
+ DST(1, 1) = DST(2, 3) = AVG3(X, A, B);
+ DST(2, 1) = DST(3, 3) = AVG3(A, B, C);
+ DST(3, 1) = AVG3(B, C, D);
+}
+
+static void VL4(uint8_t* dst) { // Vertical-Left
+ const int A = dst[0 - BPS];
+ const int B = dst[1 - BPS];
+ const int C = dst[2 - BPS];
+ const int D = dst[3 - BPS];
+ const int E = dst[4 - BPS];
+ const int F = dst[5 - BPS];
+ const int G = dst[6 - BPS];
+ const int H = dst[7 - BPS];
+ DST(0, 0) = AVG2(A, B);
+ DST(1, 0) = DST(0, 2) = AVG2(B, C);
+ DST(2, 0) = DST(1, 2) = AVG2(C, D);
+ DST(3, 0) = DST(2, 2) = AVG2(D, E);
+
+ DST(0, 1) = AVG3(A, B, C);
+ DST(1, 1) = DST(0, 3) = AVG3(B, C, D);
+ DST(2, 1) = DST(1, 3) = AVG3(C, D, E);
+ DST(3, 1) = DST(2, 3) = AVG3(D, E, F);
+ DST(3, 2) = AVG3(E, F, G);
+ DST(3, 3) = AVG3(F, G, H);
+}
+
+static void HU4(uint8_t* dst) { // Horizontal-Up
+ const int I = dst[-1 + 0 * BPS];
+ const int J = dst[-1 + 1 * BPS];
+ const int K = dst[-1 + 2 * BPS];
+ const int L = dst[-1 + 3 * BPS];
+ DST(0, 0) = AVG2(I, J);
+ DST(2, 0) = DST(0, 1) = AVG2(J, K);
+ DST(2, 1) = DST(0, 2) = AVG2(K, L);
+ DST(1, 0) = AVG3(I, J, K);
+ DST(3, 0) = DST(1, 1) = AVG3(J, K, L);
+ DST(3, 1) = DST(1, 2) = AVG3(K, L, L);
+ DST(3, 2) = DST(2, 2) =
+ DST(0, 3) = DST(1, 3) = DST(2, 3) = DST(3, 3) = L;
+}
+
+static void HD4(uint8_t* dst) { // Horizontal-Down
+ const int I = dst[-1 + 0 * BPS];
+ const int J = dst[-1 + 1 * BPS];
+ const int K = dst[-1 + 2 * BPS];
+ const int L = dst[-1 + 3 * BPS];
+ const int X = dst[-1 - BPS];
+ const int A = dst[0 - BPS];
+ const int B = dst[1 - BPS];
+ const int C = dst[2 - BPS];
+
+ DST(0, 0) = DST(2, 1) = AVG2(I, X);
+ DST(0, 1) = DST(2, 2) = AVG2(J, I);
+ DST(0, 2) = DST(2, 3) = AVG2(K, J);
+ DST(0, 3) = AVG2(L, K);
+
+ DST(3, 0) = AVG3(A, B, C);
+ DST(2, 0) = AVG3(X, A, B);
+ DST(1, 0) = DST(3, 1) = AVG3(I, X, A);
+ DST(1, 1) = DST(3, 2) = AVG3(J, I, X);
+ DST(1, 2) = DST(3, 3) = AVG3(K, J, I);
+ DST(1, 3) = AVG3(L, K, J);
+}
+
+#undef DST
+#undef AVG3
+#undef AVG2
+
+VP8PredFunc VP8PredLuma4[NUM_BMODES];
+
+//------------------------------------------------------------------------------
+// Chroma
+
+static void VE8uv(uint8_t* dst) { // vertical
+ int j;
+ for (j = 0; j < 8; ++j) {
+ memcpy(dst + j * BPS, dst - BPS, 8);
+ }
+}
+
+static void HE8uv(uint8_t* dst) { // horizontal
+ int j;
+ for (j = 0; j < 8; ++j) {
+ memset(dst, dst[-1], 8);
+ dst += BPS;
+ }
+}
+
+// helper for chroma-DC predictions
+static WEBP_INLINE void Put8x8uv(uint8_t value, uint8_t* dst) {
+ int j;
+ for (j = 0; j < 8; ++j) {
+ memset(dst + j * BPS, value, 8);
+ }
+}
+
+static void DC8uv(uint8_t* dst) { // DC
+ int dc0 = 8;
+ int i;
+ for (i = 0; i < 8; ++i) {
+ dc0 += dst[i - BPS] + dst[-1 + i * BPS];
+ }
+ Put8x8uv(dc0 >> 4, dst);
+}
+
+static void DC8uvNoLeft(uint8_t* dst) { // DC with no left samples
+ int dc0 = 4;
+ int i;
+ for (i = 0; i < 8; ++i) {
+ dc0 += dst[i - BPS];
+ }
+ Put8x8uv(dc0 >> 3, dst);
+}
+
+static void DC8uvNoTop(uint8_t* dst) { // DC with no top samples
+ int dc0 = 4;
+ int i;
+ for (i = 0; i < 8; ++i) {
+ dc0 += dst[-1 + i * BPS];
+ }
+ Put8x8uv(dc0 >> 3, dst);
+}
+
+static void DC8uvNoTopLeft(uint8_t* dst) { // DC with nothing
+ Put8x8uv(0x80, dst);
+}
+
+VP8PredFunc VP8PredChroma8[NUM_B_DC_MODES];
+
+//------------------------------------------------------------------------------
+// Edge filtering functions
+
+// 4 pixels in, 2 pixels out
+static WEBP_INLINE void do_filter2(uint8_t* p, int step) {
+ const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
+ const int a = 3 * (q0 - p0) + VP8ksclip1[p1 - q1]; // in [-893,892]
+ const int a1 = VP8ksclip2[(a + 4) >> 3]; // in [-16,15]
+ const int a2 = VP8ksclip2[(a + 3) >> 3];
+ p[-step] = VP8kclip1[p0 + a2];
+ p[ 0] = VP8kclip1[q0 - a1];
+}
+
+// 4 pixels in, 4 pixels out
+static WEBP_INLINE void do_filter4(uint8_t* p, int step) {
+ const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
+ const int a = 3 * (q0 - p0);
+ const int a1 = VP8ksclip2[(a + 4) >> 3];
+ const int a2 = VP8ksclip2[(a + 3) >> 3];
+ const int a3 = (a1 + 1) >> 1;
+ p[-2*step] = VP8kclip1[p1 + a3];
+ p[- step] = VP8kclip1[p0 + a2];
+ p[ 0] = VP8kclip1[q0 - a1];
+ p[ step] = VP8kclip1[q1 - a3];
+}
+
+// 6 pixels in, 6 pixels out
+static WEBP_INLINE void do_filter6(uint8_t* p, int step) {
+ const int p2 = p[-3*step], p1 = p[-2*step], p0 = p[-step];
+ const int q0 = p[0], q1 = p[step], q2 = p[2*step];
+ const int a = VP8ksclip1[3 * (q0 - p0) + VP8ksclip1[p1 - q1]];
+ // a is in [-128,127], a1 in [-27,27], a2 in [-18,18] and a3 in [-9,9]
+ const int a1 = (27 * a + 63) >> 7; // eq. to ((3 * a + 7) * 9) >> 7
+ const int a2 = (18 * a + 63) >> 7; // eq. to ((2 * a + 7) * 9) >> 7
+ const int a3 = (9 * a + 63) >> 7; // eq. to ((1 * a + 7) * 9) >> 7
+ p[-3*step] = VP8kclip1[p2 + a3];
+ p[-2*step] = VP8kclip1[p1 + a2];
+ p[- step] = VP8kclip1[p0 + a1];
+ p[ 0] = VP8kclip1[q0 - a1];
+ p[ step] = VP8kclip1[q1 - a2];
+ p[ 2*step] = VP8kclip1[q2 - a3];
+}
+
+static WEBP_INLINE int hev(const uint8_t* p, int step, int thresh) {
+ const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
+ return (VP8kabs0[p1 - p0] > thresh) || (VP8kabs0[q1 - q0] > thresh);
+}
+
+static WEBP_INLINE int needs_filter(const uint8_t* p, int step, int t) {
+ const int p1 = p[-2 * step], p0 = p[-step], q0 = p[0], q1 = p[step];
+ return ((4 * VP8kabs0[p0 - q0] + VP8kabs0[p1 - q1]) <= t);
+}
+
+static WEBP_INLINE int needs_filter2(const uint8_t* p,
+ int step, int t, int it) {
+ const int p3 = p[-4 * step], p2 = p[-3 * step], p1 = p[-2 * step];
+ const int p0 = p[-step], q0 = p[0];
+ const int q1 = p[step], q2 = p[2 * step], q3 = p[3 * step];
+ if ((4 * VP8kabs0[p0 - q0] + VP8kabs0[p1 - q1]) > t) return 0;
+ return VP8kabs0[p3 - p2] <= it && VP8kabs0[p2 - p1] <= it &&
+ VP8kabs0[p1 - p0] <= it && VP8kabs0[q3 - q2] <= it &&
+ VP8kabs0[q2 - q1] <= it && VP8kabs0[q1 - q0] <= it;
+}
+
+//------------------------------------------------------------------------------
+// Simple In-loop filtering (Paragraph 15.2)
+
+static void SimpleVFilter16(uint8_t* p, int stride, int thresh) {
+ int i;
+ const int thresh2 = 2 * thresh + 1;
+ for (i = 0; i < 16; ++i) {
+ if (needs_filter(p + i, stride, thresh2)) {
+ do_filter2(p + i, stride);
+ }
+ }
+}
+
+static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
+ int i;
+ const int thresh2 = 2 * thresh + 1;
+ for (i = 0; i < 16; ++i) {
+ if (needs_filter(p + i * stride, 1, thresh2)) {
+ do_filter2(p + i * stride, 1);
+ }
+ }
+}
+
+static void SimpleVFilter16i(uint8_t* p, int stride, int thresh) {
+ int k;
+ for (k = 3; k > 0; --k) {
+ p += 4 * stride;
+ SimpleVFilter16(p, stride, thresh);
+ }
+}
+
+static void SimpleHFilter16i(uint8_t* p, int stride, int thresh) {
+ int k;
+ for (k = 3; k > 0; --k) {
+ p += 4;
+ SimpleHFilter16(p, stride, thresh);
+ }
+}
+
+//------------------------------------------------------------------------------
+// Complex In-loop filtering (Paragraph 15.3)
+
+static WEBP_INLINE void FilterLoop26(uint8_t* p,
+ int hstride, int vstride, int size,
+ int thresh, int ithresh, int hev_thresh) {
+ const int thresh2 = 2 * thresh + 1;
+ while (size-- > 0) {
+ if (needs_filter2(p, hstride, thresh2, ithresh)) {
+ if (hev(p, hstride, hev_thresh)) {
+ do_filter2(p, hstride);
+ } else {
+ do_filter6(p, hstride);
+ }
+ }
+ p += vstride;
+ }
+}
+
+static WEBP_INLINE void FilterLoop24(uint8_t* p,
+ int hstride, int vstride, int size,
+ int thresh, int ithresh, int hev_thresh) {
+ const int thresh2 = 2 * thresh + 1;
+ while (size-- > 0) {
+ if (needs_filter2(p, hstride, thresh2, ithresh)) {
+ if (hev(p, hstride, hev_thresh)) {
+ do_filter2(p, hstride);
+ } else {
+ do_filter4(p, hstride);
+ }
+ }
+ p += vstride;
+ }
+}
+
+// on macroblock edges
+static void VFilter16(uint8_t* p, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ FilterLoop26(p, stride, 1, 16, thresh, ithresh, hev_thresh);
+}
+
+static void HFilter16(uint8_t* p, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ FilterLoop26(p, 1, stride, 16, thresh, ithresh, hev_thresh);
+}
+
+// on three inner edges
+static void VFilter16i(uint8_t* p, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ int k;
+ for (k = 3; k > 0; --k) {
+ p += 4 * stride;
+ FilterLoop24(p, stride, 1, 16, thresh, ithresh, hev_thresh);
+ }
+}
+
+static void HFilter16i(uint8_t* p, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ int k;
+ for (k = 3; k > 0; --k) {
+ p += 4;
+ FilterLoop24(p, 1, stride, 16, thresh, ithresh, hev_thresh);
+ }
+}
+
+// 8-pixels wide variant, for chroma filtering
+static void VFilter8(uint8_t* u, uint8_t* v, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ FilterLoop26(u, stride, 1, 8, thresh, ithresh, hev_thresh);
+ FilterLoop26(v, stride, 1, 8, thresh, ithresh, hev_thresh);
+}
+
+static void HFilter8(uint8_t* u, uint8_t* v, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ FilterLoop26(u, 1, stride, 8, thresh, ithresh, hev_thresh);
+ FilterLoop26(v, 1, stride, 8, thresh, ithresh, hev_thresh);
+}
+
+static void VFilter8i(uint8_t* u, uint8_t* v, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ FilterLoop24(u + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
+ FilterLoop24(v + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
+}
+
+static void HFilter8i(uint8_t* u, uint8_t* v, int stride,
+ int thresh, int ithresh, int hev_thresh) {
+ FilterLoop24(u + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
+ FilterLoop24(v + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
+}
+
+//------------------------------------------------------------------------------
+
+static void DitherCombine8x8(const uint8_t* dither, uint8_t* dst,
+ int dst_stride) {
+ int i, j;
+ for (j = 0; j < 8; ++j) {
+ for (i = 0; i < 8; ++i) {
+ const int delta0 = dither[i] - VP8_DITHER_AMP_CENTER;
+ const int delta1 =
+ (delta0 + VP8_DITHER_DESCALE_ROUNDER) >> VP8_DITHER_DESCALE;
+ dst[i] = clip_8b((int)dst[i] + delta1);
+ }
+ dst += dst_stride;
+ dither += 8;
+ }
+}
+
+//------------------------------------------------------------------------------
+
+VP8DecIdct2 VP8Transform;
+VP8DecIdct VP8TransformAC3;
+VP8DecIdct VP8TransformUV;
+VP8DecIdct VP8TransformDC;
+VP8DecIdct VP8TransformDCUV;
+
+VP8LumaFilterFunc VP8VFilter16;
+VP8LumaFilterFunc VP8HFilter16;
+VP8ChromaFilterFunc VP8VFilter8;
+VP8ChromaFilterFunc VP8HFilter8;
+VP8LumaFilterFunc VP8VFilter16i;
+VP8LumaFilterFunc VP8HFilter16i;
+VP8ChromaFilterFunc VP8VFilter8i;
+VP8ChromaFilterFunc VP8HFilter8i;
+VP8SimpleFilterFunc VP8SimpleVFilter16;
+VP8SimpleFilterFunc VP8SimpleHFilter16;
+VP8SimpleFilterFunc VP8SimpleVFilter16i;
+VP8SimpleFilterFunc VP8SimpleHFilter16i;
+
+void (*VP8DitherCombine8x8)(const uint8_t* dither, uint8_t* dst,
+ int dst_stride);
+
+extern void VP8DspInitSSE2(void);
+extern void VP8DspInitSSE41(void);
+extern void VP8DspInitNEON(void);
+extern void VP8DspInitMIPS32(void);
+extern void VP8DspInitMIPSdspR2(void);
+extern void VP8DspInitMSA(void);
+
+static volatile VP8CPUInfo dec_last_cpuinfo_used =
+ (VP8CPUInfo)&dec_last_cpuinfo_used;
+
+WEBP_TSAN_IGNORE_FUNCTION void VP8DspInit(void) {
+ if (dec_last_cpuinfo_used == VP8GetCPUInfo) return;
+
+ VP8InitClipTables();
+
+ VP8TransformWHT = TransformWHT;
+ VP8Transform = TransformTwo;
+ VP8TransformUV = TransformUV;
+ VP8TransformDC = TransformDC;
+ VP8TransformDCUV = TransformDCUV;
+ VP8TransformAC3 = TransformAC3;
+
+ VP8VFilter16 = VFilter16;
+ VP8HFilter16 = HFilter16;
+ VP8VFilter8 = VFilter8;
+ VP8HFilter8 = HFilter8;
+ VP8VFilter16i = VFilter16i;
+ VP8HFilter16i = HFilter16i;
+ VP8VFilter8i = VFilter8i;
+ VP8HFilter8i = HFilter8i;
+ VP8SimpleVFilter16 = SimpleVFilter16;
+ VP8SimpleHFilter16 = SimpleHFilter16;
+ VP8SimpleVFilter16i = SimpleVFilter16i;
+ VP8SimpleHFilter16i = SimpleHFilter16i;
+
+ VP8PredLuma4[0] = DC4;
+ VP8PredLuma4[1] = TM4;
+ VP8PredLuma4[2] = VE4;
+ VP8PredLuma4[3] = HE4;
+ VP8PredLuma4[4] = RD4;
+ VP8PredLuma4[5] = VR4;
+ VP8PredLuma4[6] = LD4;
+ VP8PredLuma4[7] = VL4;
+ VP8PredLuma4[8] = HD4;
+ VP8PredLuma4[9] = HU4;
+
+ VP8PredLuma16[0] = DC16;
+ VP8PredLuma16[1] = TM16;
+ VP8PredLuma16[2] = VE16;
+ VP8PredLuma16[3] = HE16;
+ VP8PredLuma16[4] = DC16NoTop;
+ VP8PredLuma16[5] = DC16NoLeft;
+ VP8PredLuma16[6] = DC16NoTopLeft;
+
+ VP8PredChroma8[0] = DC8uv;
+ VP8PredChroma8[1] = TM8uv;
+ VP8PredChroma8[2] = VE8uv;
+ VP8PredChroma8[3] = HE8uv;
+ VP8PredChroma8[4] = DC8uvNoTop;
+ VP8PredChroma8[5] = DC8uvNoLeft;
+ VP8PredChroma8[6] = DC8uvNoTopLeft;
+
+ VP8DitherCombine8x8 = DitherCombine8x8;
+
+ // If defined, use CPUInfo() to overwrite some pointers with faster versions.
+ if (VP8GetCPUInfo != NULL) {
+#if defined(WEBP_USE_SSE2)
+ if (VP8GetCPUInfo(kSSE2)) {
+ VP8DspInitSSE2();
+#if defined(WEBP_USE_SSE41)
+ if (VP8GetCPUInfo(kSSE4_1)) {
+ VP8DspInitSSE41();
+ }
+#endif
+ }
+#endif
+#if defined(WEBP_USE_NEON)
+ if (VP8GetCPUInfo(kNEON)) {
+ VP8DspInitNEON();
+ }
+#endif
+#if defined(WEBP_USE_MIPS32)
+ if (VP8GetCPUInfo(kMIPS32)) {
+ VP8DspInitMIPS32();
+ }
+#endif
+#if defined(WEBP_USE_MIPS_DSP_R2)
+ if (VP8GetCPUInfo(kMIPSdspR2)) {
+ VP8DspInitMIPSdspR2();
+ }
+#endif
+#if defined(WEBP_USE_MSA)
+ if (VP8GetCPUInfo(kMSA)) {
+ VP8DspInitMSA();
+ }
+#endif
+ }
+ dec_last_cpuinfo_used = VP8GetCPUInfo;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 17:05:31 +0000