ee3cf211c6
Note that there are two Godot-specific changes made to libwebp for the javascript/HTML5 platform. They are documented in the README.md.
282 lines
13 KiB
C
282 lines
13 KiB
C
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// YUV to RGB upsampling functions.
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//
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// Author(s): Branimir Vasic (branimir.vasic@imgtec.com)
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// Djordje Pesut (djordje.pesut@imgtec.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_MIPS_DSP_R2)
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#include <assert.h>
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#include "./yuv.h"
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#if !defined(WEBP_YUV_USE_TABLE)
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#define YUV_TO_RGB(Y, U, V, R, G, B) do { \
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const int t1 = MultHi(Y, 19077); \
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const int t2 = MultHi(V, 13320); \
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R = MultHi(V, 26149); \
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G = MultHi(U, 6419); \
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B = MultHi(U, 33050); \
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R = t1 + R; \
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G = t1 - G; \
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B = t1 + B; \
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R = R - 14234; \
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G = G - t2 + 8708; \
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B = B - 17685; \
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__asm__ volatile ( \
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"shll_s.w %[" #R "], %[" #R "], 17 \n\t" \
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"shll_s.w %[" #G "], %[" #G "], 17 \n\t" \
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"shll_s.w %[" #B "], %[" #B "], 17 \n\t" \
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"precrqu_s.qb.ph %[" #R "], %[" #R "], $zero \n\t" \
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"precrqu_s.qb.ph %[" #G "], %[" #G "], $zero \n\t" \
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"precrqu_s.qb.ph %[" #B "], %[" #B "], $zero \n\t" \
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"srl %[" #R "], %[" #R "], 24 \n\t" \
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"srl %[" #G "], %[" #G "], 24 \n\t" \
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"srl %[" #B "], %[" #B "], 24 \n\t" \
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: [R]"+r"(R), [G]"+r"(G), [B]"+r"(B) \
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: \
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); \
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} while (0)
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static WEBP_INLINE void YuvToRgb(int y, int u, int v, uint8_t* const rgb) {
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int r, g, b;
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YUV_TO_RGB(y, u, v, r, g, b);
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rgb[0] = r;
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rgb[1] = g;
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rgb[2] = b;
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}
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static WEBP_INLINE void YuvToBgr(int y, int u, int v, uint8_t* const bgr) {
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int r, g, b;
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YUV_TO_RGB(y, u, v, r, g, b);
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bgr[0] = b;
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bgr[1] = g;
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bgr[2] = r;
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}
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static WEBP_INLINE void YuvToRgb565(int y, int u, int v, uint8_t* const rgb) {
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int r, g, b;
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YUV_TO_RGB(y, u, v, r, g, b);
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{
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const int rg = (r & 0xf8) | (g >> 5);
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const int gb = ((g << 3) & 0xe0) | (b >> 3);
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#ifdef WEBP_SWAP_16BIT_CSP
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rgb[0] = gb;
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rgb[1] = rg;
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#else
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rgb[0] = rg;
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rgb[1] = gb;
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#endif
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}
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}
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static WEBP_INLINE void YuvToRgba4444(int y, int u, int v,
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uint8_t* const argb) {
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int r, g, b;
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YUV_TO_RGB(y, u, v, r, g, b);
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{
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const int rg = (r & 0xf0) | (g >> 4);
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const int ba = (b & 0xf0) | 0x0f; // overwrite the lower 4 bits
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#ifdef WEBP_SWAP_16BIT_CSP
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argb[0] = ba;
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argb[1] = rg;
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#else
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argb[0] = rg;
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argb[1] = ba;
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#endif
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}
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}
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#endif // WEBP_YUV_USE_TABLE
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//-----------------------------------------------------------------------------
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// Alpha handling variants
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static WEBP_INLINE void YuvToArgb(uint8_t y, uint8_t u, uint8_t v,
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uint8_t* const argb) {
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int r, g, b;
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YUV_TO_RGB(y, u, v, r, g, b);
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argb[0] = 0xff;
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argb[1] = r;
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argb[2] = g;
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argb[3] = b;
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}
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static WEBP_INLINE void YuvToBgra(uint8_t y, uint8_t u, uint8_t v,
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uint8_t* const bgra) {
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int r, g, b;
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YUV_TO_RGB(y, u, v, r, g, b);
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bgra[0] = b;
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bgra[1] = g;
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bgra[2] = r;
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bgra[3] = 0xff;
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}
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static WEBP_INLINE void YuvToRgba(uint8_t y, uint8_t u, uint8_t v,
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uint8_t* const rgba) {
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int r, g, b;
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YUV_TO_RGB(y, u, v, r, g, b);
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rgba[0] = r;
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rgba[1] = g;
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rgba[2] = b;
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rgba[3] = 0xff;
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}
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//------------------------------------------------------------------------------
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// Fancy upsampler
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#ifdef FANCY_UPSAMPLING
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// Given samples laid out in a square as:
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// [a b]
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// [c d]
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// we interpolate u/v as:
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// ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16
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// ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16
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// We process u and v together stashed into 32bit (16bit each).
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#define LOAD_UV(u, v) ((u) | ((v) << 16))
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#define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \
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static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \
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const uint8_t* top_u, const uint8_t* top_v, \
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const uint8_t* cur_u, const uint8_t* cur_v, \
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uint8_t* top_dst, uint8_t* bottom_dst, int len) { \
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int x; \
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const int last_pixel_pair = (len - 1) >> 1; \
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uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \
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uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \
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assert(top_y != NULL); \
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{ \
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const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
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FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \
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} \
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if (bottom_y != NULL) { \
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const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
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FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \
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} \
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for (x = 1; x <= last_pixel_pair; ++x) { \
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const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \
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const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \
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/* precompute invariant values associated with first and second diagonals*/\
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const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \
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const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \
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const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \
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{ \
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const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \
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const uint32_t uv1 = (diag_03 + t_uv) >> 1; \
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FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
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top_dst + (2 * x - 1) * XSTEP); \
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FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \
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top_dst + (2 * x - 0) * XSTEP); \
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} \
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if (bottom_y != NULL) { \
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const uint32_t uv0 = (diag_03 + l_uv) >> 1; \
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const uint32_t uv1 = (diag_12 + uv) >> 1; \
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FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
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bottom_dst + (2 * x - 1) * XSTEP); \
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FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \
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bottom_dst + (2 * x + 0) * XSTEP); \
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} \
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tl_uv = t_uv; \
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l_uv = uv; \
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} \
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if (!(len & 1)) { \
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{ \
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const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
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FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
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top_dst + (len - 1) * XSTEP); \
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} \
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if (bottom_y != NULL) { \
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const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
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FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
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bottom_dst + (len - 1) * XSTEP); \
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} \
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} \
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}
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// All variants implemented.
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UPSAMPLE_FUNC(UpsampleRgbLinePair, YuvToRgb, 3)
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UPSAMPLE_FUNC(UpsampleBgrLinePair, YuvToBgr, 3)
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UPSAMPLE_FUNC(UpsampleRgbaLinePair, YuvToRgba, 4)
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UPSAMPLE_FUNC(UpsampleBgraLinePair, YuvToBgra, 4)
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UPSAMPLE_FUNC(UpsampleArgbLinePair, YuvToArgb, 4)
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UPSAMPLE_FUNC(UpsampleRgba4444LinePair, YuvToRgba4444, 2)
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UPSAMPLE_FUNC(UpsampleRgb565LinePair, YuvToRgb565, 2)
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#undef LOAD_UV
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#undef UPSAMPLE_FUNC
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//------------------------------------------------------------------------------
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// Entry point
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extern void WebPInitUpsamplersMIPSdspR2(void);
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WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersMIPSdspR2(void) {
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WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair;
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WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
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WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair;
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WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
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WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
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WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
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WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
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WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
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WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
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WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
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WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
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}
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#endif // FANCY_UPSAMPLING
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//------------------------------------------------------------------------------
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// YUV444 converter
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#define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \
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static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \
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uint8_t* dst, int len) { \
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int i; \
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for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \
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}
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YUV444_FUNC(Yuv444ToRgb, YuvToRgb, 3)
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YUV444_FUNC(Yuv444ToBgr, YuvToBgr, 3)
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YUV444_FUNC(Yuv444ToRgba, YuvToRgba, 4)
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YUV444_FUNC(Yuv444ToBgra, YuvToBgra, 4)
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YUV444_FUNC(Yuv444ToArgb, YuvToArgb, 4)
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YUV444_FUNC(Yuv444ToRgba4444, YuvToRgba4444, 2)
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YUV444_FUNC(Yuv444ToRgb565, YuvToRgb565, 2)
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#undef YUV444_FUNC
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//------------------------------------------------------------------------------
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// Entry point
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extern void WebPInitYUV444ConvertersMIPSdspR2(void);
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WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void) {
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WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb;
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WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba;
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WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr;
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WebPYUV444Converters[MODE_BGRA] = Yuv444ToBgra;
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WebPYUV444Converters[MODE_ARGB] = Yuv444ToArgb;
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WebPYUV444Converters[MODE_RGBA_4444] = Yuv444ToRgba4444;
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WebPYUV444Converters[MODE_RGB_565] = Yuv444ToRgb565;
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WebPYUV444Converters[MODE_rgbA] = Yuv444ToRgba;
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WebPYUV444Converters[MODE_bgrA] = Yuv444ToBgra;
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WebPYUV444Converters[MODE_Argb] = Yuv444ToArgb;
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WebPYUV444Converters[MODE_rgbA_4444] = Yuv444ToRgba4444;
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}
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#else // !WEBP_USE_MIPS_DSP_R2
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WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersMIPSdspR2)
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#endif // WEBP_USE_MIPS_DSP_R2
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#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2))
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WEBP_DSP_INIT_STUB(WebPInitUpsamplersMIPSdspR2)
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#endif
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