cosmetics: fix some typos

Change-Id: I0d6efebd817815139db5ae87236fd8911df4d53c

src/dec/alpha.c

@@ -85,7 +85,7 @@ static int ALPHInit(ALPHDecoder* const dec, const uint8_t* data,
 }
 
 // Decodes, unfilters and dequantizes *at least* 'num_rows' rows of alpha
-// starting from row number 'row'. It assumes that rows upto (row - 1) have
+// starting from row number 'row'. It assumes that rows up to (row - 1) have
 // already been decoded.
 // Returns false in case of bitstream error.
 static int ALPHDecode(VP8Decoder* const dec, int row, int num_rows) {

src/dsp/enc_neon.c

@@ -493,7 +493,7 @@ static int Disto4x4(const uint8_t* const a, const uint8_t* const b,
     // q12/14 tmp[12-15]
 
     // These are still in 01 45 23 67 order. We fix it easily in the addition
-    // case but the subtraction propegates them.
+    // case but the subtraction propagates them.
     "vswp            d3, d27                  \n"
     "vswp            d19, d31                 \n"
 

src/dsp/enc_sse2.c

@@ -644,7 +644,7 @@ static int TTransformSSE2(const uint8_t* inA, const uint8_t* inB,
   __m128i tmp_0, tmp_1, tmp_2, tmp_3;
   const __m128i zero = _mm_setzero_si128();
 
-  // Load, combine and tranpose inputs.
+  // Load, combine and transpose inputs.
   {
     const __m128i inA_0 = _mm_loadl_epi64((__m128i*)&inA[BPS * 0]);
     const __m128i inA_1 = _mm_loadl_epi64((__m128i*)&inA[BPS * 1]);

src/dsp/upsampling_sse2.c

@@ -51,7 +51,7 @@ extern "C" {
   (out) = _mm_sub_epi8(tmp0, tmp4);    /* (k + in + 1) / 2 - lsb_correction */ \
 } while (0)
 
-// pack and store two alterning pixel rows
+// 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 */ \

src/enc/alpha.c

@@ -201,7 +201,7 @@ static uint32_t GetFilterMap(const uint8_t* alpha, int width, int height,
     const int kMinColorsForFilterNone = 16;
     const int kMaxColorsForFilterNone = 192;
     const int num_colors = GetNumColors(alpha, width, height, width);
-    // For low number of colors, NONE yeilds better compression.
+    // For low number of colors, NONE yields better compression.
     filter = (num_colors <= kMinColorsForFilterNone) ? WEBP_FILTER_NONE :
              EstimateBestFilter(alpha, width, height, width);
     bit_map |= 1 << filter;

src/enc/backward_references.c

@@ -156,7 +156,7 @@ static void GetParamsForHashChainFindCopy(int quality, int xsize,
   *window_size = (max_window_size > WINDOW_SIZE) ? WINDOW_SIZE
                : max_window_size;
   *iter_pos = 8 + (quality >> 3);
-  // For lower entropy images, the rigourous search loop in HashChainFindCopy
+  // For lower entropy images, the rigorous search loop in HashChainFindCopy
   // can be relaxed.
   *iter_limit = (cache_bits > 0) ? iter_neg : iter_neg / 2;
 }

src/enc/frame.c

@@ -739,7 +739,7 @@ static double GetPSNR(uint64_t mse, uint64_t size) {
 //------------------------------------------------------------------------------
 //  StatLoop(): only collect statistics (number of skips, token usage, ...).
 //  This is used for deciding optimal probabilities. It also modifies the
-//  quantizer value if some target (size, PNSR) was specified.
+//  quantizer value if some target (size, PSNR) was specified.
 
 static void SetLoopParams(VP8Encoder* const enc, float q) {
   // Make sure the quality parameter is inside valid bounds

src/enc/iterator.c

@@ -285,7 +285,7 @@ void VP8IteratorBytesToNz(VP8EncIterator* const it) {
 #undef BIT
 
 //------------------------------------------------------------------------------
-// Advance to the next position, doing the bookeeping.
+// Advance to the next position, doing the bookkeeping.
 
 void VP8IteratorSaveBoundary(VP8EncIterator* const it) {
   VP8Encoder* const enc = it->enc_;

src/enc/quant.c

@@ -25,7 +25,7 @@
 
 #define MID_ALPHA 64      // neutral value for susceptibility
 #define MIN_ALPHA 30      // lowest usable value for susceptibility
-#define MAX_ALPHA 100     // higher meaninful value for susceptibility
+#define MAX_ALPHA 100     // higher meaningful value for susceptibility
 
 #define SNS_TO_DQ 0.9     // Scaling constant between the sns value and the QP
                           // power-law modulation. Must be strictly less than 1.
@@ -292,7 +292,7 @@ static double QualityToCompression(double c) {
   // exponent is somewhere between 2.8 and 3.2, but we're mostly interested
   // in the mid-quant range. So we scale the compressibility inversely to
   // this power-law: quant ~= compression ^ 1/3. This law holds well for
-  // low quant. Finer modelling for high-quant would make use of kAcTable[]
+  // low quant. Finer modeling for high-quant would make use of kAcTable[]
   // more explicitly.
   const double v = pow(linear_c, 1 / 3.);
   return v;
@@ -814,7 +814,7 @@ static int ReconstructUV(VP8EncIterator* const it, VP8ModeScore* const rd,
 
 //------------------------------------------------------------------------------
 // RD-opt decision. Reconstruct each modes, evalue distortion and bit-cost.
-// Pick the mode is lower RD-cost = Rate + lamba * Distortion.
+// Pick the mode is lower RD-cost = Rate + lambda * Distortion.
 
 static void StoreMaxDelta(VP8SegmentInfo* const dqm, const int16_t DCs[16]) {
   // We look at the first three AC coefficients to determine what is the average

src/enc/vp8enci.h

@@ -256,7 +256,7 @@ typedef struct {
   int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_;
 } VP8SegmentInfo;
 
-// Handy transcient struct to accumulate score and info during RD-optimization
+// Handy transient struct to accumulate score and info during RD-optimization
 // and mode evaluation.
 typedef struct {
   score_t D, SD;              // Distortion, spectral distortion

src/enc/webpenc.c

@@ -157,7 +157,7 @@ static void MapConfigToTools(VP8Encoder* const enc) {
 //             non-zero: 196
 //             lf-stats: 2048
 //                total: 68635
-// Transcient object sizes:
+// Transient object sizes:
 //       VP8EncIterator: 352
 //         VP8ModeScore: 912
 //       VP8SegmentInfo: 532

src/utils/bit_writer.c

@@ -256,7 +256,7 @@ void VP8LWriteBits(VP8LBitWriter* const bw, int n_bits, uint32_t bits) {
     uint8_t* p = &bw->buf_[bw->bit_pos_ >> 3];
     const int bits_reserved_in_first_byte = bw->bit_pos_ & 7;
     const int bits_left_to_write = n_bits - 8 + bits_reserved_in_first_byte;
-    // implicit & 0xff is assumed for uint8_t arithmetics
+    // implicit & 0xff is assumed for uint8_t arithmetic
     *p++ |= bits << bits_reserved_in_first_byte;
     bits >>= 8 - bits_reserved_in_first_byte;
     if (bits_left_to_write >= 1) {

src/utils/huffman_encode.c

@@ -27,7 +27,7 @@ static int ValuesShouldBeCollapsedToStrideAverage(int a, int b) {
 }
 
 // Change the population counts in a way that the consequent
-// Hufmann tree compression, especially its RLE-part, give smaller output.
+// Huffman tree compression, especially its RLE-part, give smaller output.
 static int OptimizeHuffmanForRle(int length, int* const counts) {
   uint8_t* good_for_rle;
   // 1) Let's make the Huffman code more compatible with rle encoding.