webp: Make it a module and unbundle libwebp thirdparty files

Note that there are two Godot-specific changes made to libwebp
for the javascript/HTML5 platform. They are documented in the
README.md.

1 files changed, 0 insertions, 249 deletions

diff --git a/drivers/webp/dsp/upsampling_sse2.c b/drivers/webp/dsp/upsampling_sse2.c
deleted file mode 100644
index b5b668900..000000000
--- a/drivers/webp/dsp/upsampling_sse2.c
+++ /dev/null
@@ -1,249 +0,0 @@
-// Copyright 2011 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.
-// -----------------------------------------------------------------------------
-//
-// SSE2 version of YUV to RGB upsampling functions.
-//
-// Author: somnath@google.com (Somnath Banerjee)
-
-#include "./dsp.h"
-
-#if defined(WEBP_USE_SSE2)
-
-#include <assert.h>
-#include <emmintrin.h>
-#include <string.h>
-#include "./yuv.h"
-
-#ifdef FANCY_UPSAMPLING
-
-// We compute (9*a + 3*b + 3*c + d + 8) / 16 as follows
-// u = (9*a + 3*b + 3*c + d + 8) / 16
-//   = (a + (a + 3*b + 3*c + d) / 8 + 1) / 2
-//   = (a + m + 1) / 2
-// where m = (a + 3*b + 3*c + d) / 8
-//         = ((a + b + c + d) / 2 + b + c) / 4
-//
-// Let's say  k = (a + b + c + d) / 4.
-// We can compute k as
-// k = (s + t + 1) / 2 - ((a^d) | (b^c) | (s^t)) & 1
-// where s = (a + d + 1) / 2 and t = (b + c + 1) / 2
-//
-// Then m can be written as
-// m = (k + t + 1) / 2 - (((b^c) & (s^t)) | (k^t)) & 1
-
-// Computes out = (k + in + 1) / 2 - ((ij & (s^t)) | (k^in)) & 1
-#define GET_M(ij, in, out) do {                                                \
-  const __m128i tmp0 = _mm_avg_epu8(k, (in));     /* (k + in + 1) / 2 */       \
-  const __m128i tmp1 = _mm_and_si128((ij), st);   /* (ij) & (s^t) */           \
-  const __m128i tmp2 = _mm_xor_si128(k, (in));    /* (k^in) */                 \
-  const __m128i tmp3 = _mm_or_si128(tmp1, tmp2);  /* ((ij) & (s^t)) | (k^in) */\
-  const __m128i tmp4 = _mm_and_si128(tmp3, one);  /* & 1 -> lsb_correction */  \
-  (out) = _mm_sub_epi8(tmp0, tmp4);    /* (k + in + 1) / 2 - lsb_correction */ \
-} while (0)
-
-// pack and store two alternating pixel rows
-#define PACK_AND_STORE(a, b, da, db, out) do {                                 \
-  const __m128i t_a = _mm_avg_epu8(a, da);  /* (9a + 3b + 3c +  d + 8) / 16 */ \
-  const __m128i t_b = _mm_avg_epu8(b, db);  /* (3a + 9b +  c + 3d + 8) / 16 */ \
-  const __m128i t_1 = _mm_unpacklo_epi8(t_a, t_b);                             \
-  const __m128i t_2 = _mm_unpackhi_epi8(t_a, t_b);                             \
-  _mm_store_si128(((__m128i*)(out)) + 0, t_1);                                 \
-  _mm_store_si128(((__m128i*)(out)) + 1, t_2);                                 \
-} while (0)
-
-// Loads 17 pixels each from rows r1 and r2 and generates 32 pixels.
-#define UPSAMPLE_32PIXELS(r1, r2, out) {                                       \
-  const __m128i one = _mm_set1_epi8(1);                                        \
-  const __m128i a = _mm_loadu_si128((const __m128i*)&(r1)[0]);                 \
-  const __m128i b = _mm_loadu_si128((const __m128i*)&(r1)[1]);                 \
-  const __m128i c = _mm_loadu_si128((const __m128i*)&(r2)[0]);                 \
-  const __m128i d = _mm_loadu_si128((const __m128i*)&(r2)[1]);                 \
-                                                                               \
-  const __m128i s = _mm_avg_epu8(a, d);        /* s = (a + d + 1) / 2 */       \
-  const __m128i t = _mm_avg_epu8(b, c);        /* t = (b + c + 1) / 2 */       \
-  const __m128i st = _mm_xor_si128(s, t);      /* st = s^t */                  \
-                                                                               \
-  const __m128i ad = _mm_xor_si128(a, d);      /* ad = a^d */                  \
-  const __m128i bc = _mm_xor_si128(b, c);      /* bc = b^c */                  \
-                                                                               \
-  const __m128i t1 = _mm_or_si128(ad, bc);     /* (a^d) | (b^c) */             \
-  const __m128i t2 = _mm_or_si128(t1, st);     /* (a^d) | (b^c) | (s^t) */     \
-  const __m128i t3 = _mm_and_si128(t2, one);   /* (a^d) | (b^c) | (s^t) & 1 */ \
-  const __m128i t4 = _mm_avg_epu8(s, t);                                       \
-  const __m128i k = _mm_sub_epi8(t4, t3);      /* k = (a + b + c + d) / 4 */   \
-  __m128i diag1, diag2;                                                        \
-                                                                               \
-  GET_M(bc, t, diag1);                  /* diag1 = (a + 3b + 3c + d) / 8 */    \
-  GET_M(ad, s, diag2);                  /* diag2 = (3a + b + c + 3d) / 8 */    \
-                                                                               \
-  /* pack the alternate pixels */                                              \
-  PACK_AND_STORE(a, b, diag1, diag2, out +      0);  /* store top */           \
-  PACK_AND_STORE(c, d, diag2, diag1, out + 2 * 32);  /* store bottom */        \
-}
-
-// Turn the macro into a function for reducing code-size when non-critical
-static void Upsample32Pixels(const uint8_t r1[], const uint8_t r2[],
-                             uint8_t* const out) {
-  UPSAMPLE_32PIXELS(r1, r2, out);
-}
-
-#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) {                         \
-  uint8_t r1[17], r2[17];                                                      \
-  memcpy(r1, (tb), (num_pixels));                                              \
-  memcpy(r2, (bb), (num_pixels));                                              \
-  /* replicate last byte */                                                    \
-  memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels));          \
-  memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels));          \
-  /* using the shared function instead of the macro saves ~3k code size */     \
-  Upsample32Pixels(r1, r2, out);                                               \
-}
-
-#define CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y,                              \
-                    top_dst, bottom_dst, cur_x, num_pixels) {                  \
-  int n;                                                                       \
-  for (n = 0; n < (num_pixels); ++n) {                                         \
-    FUNC(top_y[(cur_x) + n], r_u[n], r_v[n],                                   \
-         top_dst + ((cur_x) + n) * XSTEP);                                     \
-  }                                                                            \
-  if (bottom_y != NULL) {                                                      \
-    for (n = 0; n < (num_pixels); ++n) {                                       \
-      FUNC(bottom_y[(cur_x) + n], r_u[64 + n], r_v[64 + n],                    \
-           bottom_dst + ((cur_x) + n) * XSTEP);                                \
-    }                                                                          \
-  }                                                                            \
-}
-
-#define CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y,                           \
-                       top_dst, bottom_dst, cur_x) do {                        \
-  FUNC##32(top_y + (cur_x), r_u, r_v, top_dst + (cur_x) * XSTEP);              \
-  if (bottom_y != NULL) {                                                      \
-    FUNC##32(bottom_y + (cur_x), r_u + 64, r_v + 64,                           \
-             bottom_dst + (cur_x) * XSTEP);                                    \
-  }                                                                            \
-} while (0)
-
-#define SSE2_UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP)                             \
-static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y,           \
-                      const uint8_t* top_u, const uint8_t* top_v,              \
-                      const uint8_t* cur_u, const uint8_t* cur_v,              \
-                      uint8_t* top_dst, uint8_t* bottom_dst, int len) {        \
-  int uv_pos, pos;                                                             \
-  /* 16byte-aligned array to cache reconstructed u and v */                    \
-  uint8_t uv_buf[4 * 32 + 15];                                                 \
-  uint8_t* const r_u = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15);             \
-  uint8_t* const r_v = r_u + 32;                                               \
-                                                                               \
-  assert(top_y != NULL);                                                       \
-  {   /* Treat the first pixel in regular way */                               \
-    const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1;                       \
-    const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1;                       \
-    const int u0_t = (top_u[0] + u_diag) >> 1;                                 \
-    const int v0_t = (top_v[0] + v_diag) >> 1;                                 \
-    FUNC(top_y[0], u0_t, v0_t, top_dst);                                       \
-    if (bottom_y != NULL) {                                                    \
-      const int u0_b = (cur_u[0] + u_diag) >> 1;                               \
-      const int v0_b = (cur_v[0] + v_diag) >> 1;                               \
-      FUNC(bottom_y[0], u0_b, v0_b, bottom_dst);                               \
-    }                                                                          \
-  }                                                                            \
-  /* For UPSAMPLE_32PIXELS, 17 u/v values must be read-able for each block */  \
-  for (pos = 1, uv_pos = 0; pos + 32 + 1 <= len; pos += 32, uv_pos += 16) {    \
-    UPSAMPLE_32PIXELS(top_u + uv_pos, cur_u + uv_pos, r_u);                    \
-    UPSAMPLE_32PIXELS(top_v + uv_pos, cur_v + uv_pos, r_v);                    \
-    CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y, top_dst, bottom_dst, pos);    \
-  }                                                                            \
-  if (len > 1) {                                                               \
-    const int left_over = ((len + 1) >> 1) - (pos >> 1);                       \
-    assert(left_over > 0);                                                     \
-    UPSAMPLE_LAST_BLOCK(top_u + uv_pos, cur_u + uv_pos, left_over, r_u);       \
-    UPSAMPLE_LAST_BLOCK(top_v + uv_pos, cur_v + uv_pos, left_over, r_v);       \
-    CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, top_dst, bottom_dst,             \
-                pos, len - pos);                                               \
-  }                                                                            \
-}
-
-// SSE2 variants of the fancy upsampler.
-SSE2_UPSAMPLE_FUNC(UpsampleRgbLinePair,  VP8YuvToRgb,  3)
-SSE2_UPSAMPLE_FUNC(UpsampleBgrLinePair,  VP8YuvToBgr,  3)
-SSE2_UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4)
-SSE2_UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4)
-SSE2_UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4)
-SSE2_UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2)
-SSE2_UPSAMPLE_FUNC(UpsampleRgb565LinePair, VP8YuvToRgb565, 2)
-
-#undef GET_M
-#undef PACK_AND_STORE
-#undef UPSAMPLE_32PIXELS
-#undef UPSAMPLE_LAST_BLOCK
-#undef CONVERT2RGB
-#undef CONVERT2RGB_32
-#undef SSE2_UPSAMPLE_FUNC
-
-//------------------------------------------------------------------------------
-// Entry point
-
-extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
-
-extern void WebPInitUpsamplersSSE2(void);
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE2(void) {
-  WebPUpsamplers[MODE_RGB]  = UpsampleRgbLinePair;
-  WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_BGR]  = UpsampleBgrLinePair;
-  WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
-  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
-  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
-}
-
-#endif  // FANCY_UPSAMPLING
-
-//------------------------------------------------------------------------------
-
-extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];
-extern void WebPInitYUV444ConvertersSSE2(void);
-
-#define YUV444_FUNC(FUNC_NAME, CALL, XSTEP) \
-extern void WebP##FUNC_NAME##C(const uint8_t* y, const uint8_t* u,             \
-                               const uint8_t* v, uint8_t* dst, int len);       \
-static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,    \
-                      uint8_t* dst, int len) {                                 \
-  int i;                                                                       \
-  const int max_len = len & ~31;                                               \
-  for (i = 0; i < max_len; i += 32) CALL(y + i, u + i, v + i, dst + i * XSTEP);\
-  if (i < len) {  /* C-fallback */                                             \
-    WebP##FUNC_NAME##C(y + i, u + i, v + i, dst + i * XSTEP, len - i);         \
-  }                                                                            \
-}
-
-YUV444_FUNC(Yuv444ToRgba, VP8YuvToRgba32, 4);
-YUV444_FUNC(Yuv444ToBgra, VP8YuvToBgra32, 4);
-YUV444_FUNC(Yuv444ToRgb, VP8YuvToRgb32, 3);
-YUV444_FUNC(Yuv444ToBgr, VP8YuvToBgr32, 3);
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersSSE2(void) {
-  WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba;
-  WebPYUV444Converters[MODE_BGRA] = Yuv444ToBgra;
-  WebPYUV444Converters[MODE_RGB]  = Yuv444ToRgb;
-  WebPYUV444Converters[MODE_BGR]  = Yuv444ToBgr;
-}
-
-#else
-
-WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersSSE2)
-
-#endif  // WEBP_USE_SSE2
-
-#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_SSE2))
-WEBP_DSP_INIT_STUB(WebPInitUpsamplersSSE2)
-#endif