The Tor Browser: media/libyuv/source/rotate_argb.cc@b8a032363ba2 (annotated)

media/libyuv/source/rotate_argb.cc@b8a032363ba2 (annotated)

media/libyuv/source/rotate_argb.cc

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  *  Copyright 2012 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE 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.
  */
 #include "libyuv/rotate.h"
 #include "libyuv/cpu_id.h"
 #include "libyuv/convert.h"
 #include "libyuv/planar_functions.h"
 #include "libyuv/row.h"
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
 #endif
 // ARGBScale has a function to copy pixels to a row, striding each source
 // pixel by a constant.
 #if !defined(LIBYUV_DISABLE_X86) && \
     (defined(_M_IX86) || \
     (defined(__x86_64__) && !defined(__native_client__)) || defined(__i386__))
 #define HAS_SCALEARGBROWDOWNEVEN_SSE2
 void ScaleARGBRowDownEven_SSE2(const uint8* src_ptr, int src_stride,
                                int src_stepx,
                                uint8* dst_ptr, int dst_width);
 #endif
 #if !defined(LIBYUV_DISABLE_NEON) && !defined(__native_client__) && \
     (defined(__ARM_NEON__) || defined(LIBYUV_NEON))
 #define HAS_SCALEARGBROWDOWNEVEN_NEON
 void ScaleARGBRowDownEven_NEON(const uint8* src_ptr, int src_stride,
                                int src_stepx,
                                uint8* dst_ptr, int dst_width);
 #endif
 void ScaleARGBRowDownEven_C(const uint8* src_ptr, int,
                             int src_stepx,
                             uint8* dst_ptr, int dst_width);
 static void ARGBTranspose(const uint8* src, int src_stride,
                           uint8* dst, int dst_stride,
                           int width, int height) {
   int i;
   int src_pixel_step = src_stride >> 2;
   void (*ScaleARGBRowDownEven)(const uint8* src_ptr, int src_stride,
       int src_step, uint8* dst_ptr, int dst_width) = ScaleARGBRowDownEven_C;
 #if defined(HAS_SCALEARGBROWDOWNEVEN_SSE2)
   if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(height, 4) &&  // Width of dest.
       IS_ALIGNED(dst, 16) && IS_ALIGNED(dst_stride, 16)) {
     ScaleARGBRowDownEven = ScaleARGBRowDownEven_SSE2;
   }
 #elif defined(HAS_SCALEARGBROWDOWNEVEN_NEON)
   if (TestCpuFlag(kCpuHasNEON) && IS_ALIGNED(height, 4) &&  // Width of dest.
       IS_ALIGNED(src, 4)) {
     ScaleARGBRowDownEven = ScaleARGBRowDownEven_NEON;
   }
 #endif
   for (i = 0; i < width; ++i) {  // column of source to row of dest.
     ScaleARGBRowDownEven(src, 0, src_pixel_step, dst, height);
     dst += dst_stride;
     src += 4;
   }
 }
 void ARGBRotate90(const uint8* src, int src_stride,
                   uint8* dst, int dst_stride,
                   int width, int height) {
   // Rotate by 90 is a ARGBTranspose with the source read
   // from bottom to top. So set the source pointer to the end
   // of the buffer and flip the sign of the source stride.
   src += src_stride * (height - 1);
   src_stride = -src_stride;
   ARGBTranspose(src, src_stride, dst, dst_stride, width, height);
 }
 void ARGBRotate270(const uint8* src, int src_stride,
                     uint8* dst, int dst_stride,
                     int width, int height) {
   // Rotate by 270 is a ARGBTranspose with the destination written
   // from bottom to top. So set the destination pointer to the end
   // of the buffer and flip the sign of the destination stride.
   dst += dst_stride * (width - 1);
   dst_stride = -dst_stride;
   ARGBTranspose(src, src_stride, dst, dst_stride, width, height);
 }
 void ARGBRotate180(const uint8* src, int src_stride,
                    uint8* dst, int dst_stride,
                    int width, int height) {
   // Swap first and last row and mirror the content. Uses a temporary row.
   align_buffer_64(row, width * 4);
   const uint8* src_bot = src + src_stride * (height - 1);
   uint8* dst_bot = dst + dst_stride * (height - 1);
   int half_height = (height + 1) >> 1;
   int y;
   void (*ARGBMirrorRow)(const uint8* src, uint8* dst, int width) =
       ARGBMirrorRow_C;
   void (*CopyRow)(const uint8* src, uint8* dst, int width) = CopyRow_C;
 #if defined(HAS_ARGBMIRRORROW_SSSE3)
   if (TestCpuFlag(kCpuHasSSSE3) && IS_ALIGNED(width, 4) &&
       IS_ALIGNED(src, 16) && IS_ALIGNED(src_stride, 16) &&
       IS_ALIGNED(dst, 16) && IS_ALIGNED(dst_stride, 16)) {
     ARGBMirrorRow = ARGBMirrorRow_SSSE3;
   }
 #endif
 #if defined(HAS_ARGBMIRRORROW_AVX2)
   if (TestCpuFlag(kCpuHasAVX2) && IS_ALIGNED(width, 8)) {
     ARGBMirrorRow = ARGBMirrorRow_AVX2;
   }
 #endif
 #if defined(HAS_ARGBMIRRORROW_NEON)
   if (TestCpuFlag(kCpuHasNEON) && IS_ALIGNED(width, 4)) {
     ARGBMirrorRow = ARGBMirrorRow_NEON;
   }
 #endif
 #if defined(HAS_COPYROW_NEON)
   if (TestCpuFlag(kCpuHasNEON) && IS_ALIGNED(width * 4, 32)) {
     CopyRow = CopyRow_NEON;
   }
 #endif
 #if defined(HAS_COPYROW_X86)
   if (TestCpuFlag(kCpuHasX86)) {
     CopyRow = CopyRow_X86;
   }
 #endif
 #if defined(HAS_COPYROW_SSE2)
   if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(width * 4, 32) &&
       IS_ALIGNED(src, 16) && IS_ALIGNED(src_stride, 16) &&
       IS_ALIGNED(dst, 16) && IS_ALIGNED(dst_stride, 16)) {
     CopyRow = CopyRow_SSE2;
   }
 #endif
 #if defined(HAS_COPYROW_ERMS)
   if (TestCpuFlag(kCpuHasERMS)) {
     CopyRow = CopyRow_ERMS;
   }
 #endif
 #if defined(HAS_COPYROW_MIPS)
   if (TestCpuFlag(kCpuHasMIPS)) {
     CopyRow = CopyRow_MIPS;
   }
 #endif
   // Odd height will harmlessly mirror the middle row twice.
   for (y = 0; y < half_height; ++y) {
     ARGBMirrorRow(src, row, width);  // Mirror first row into a buffer
     ARGBMirrorRow(src_bot, dst, width);  // Mirror last row into first row
     CopyRow(row, dst_bot, width * 4);  // Copy first mirrored row into last
     src += src_stride;
     dst += dst_stride;
     src_bot -= src_stride;
     dst_bot -= dst_stride;
   }
   free_aligned_buffer_64(row);
 }
 LIBYUV_API
 int ARGBRotate(const uint8* src_argb, int src_stride_argb,
                uint8* dst_argb, int dst_stride_argb,
                int width, int height,
                enum RotationMode mode) {
   if (!src_argb || width <= 0 || height == 0 || !dst_argb) {
     return -1;
   }
   // Negative height means invert the image.
   if (height < 0) {
     height = -height;
     src_argb = src_argb + (height - 1) * src_stride_argb;
     src_stride_argb = -src_stride_argb;
   }
   switch (mode) {
     case kRotate0:
       // copy frame
       return ARGBCopy(src_argb, src_stride_argb,
                       dst_argb, dst_stride_argb,
                       width, height);
     case kRotate90:
       ARGBRotate90(src_argb, src_stride_argb,
                    dst_argb, dst_stride_argb,
                    width, height);
       return 0;
     case kRotate270:
       ARGBRotate270(src_argb, src_stride_argb,
                     dst_argb, dst_stride_argb,
                     width, height);
       return 0;
     case kRotate180:
       ARGBRotate180(src_argb, src_stride_argb,
                     dst_argb, dst_stride_argb,
                     width, height);
       return 0;
     default:
       break;
   }
   return -1;
 }
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif

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media/libyuv/source/rotate_argb.cc@b8a032363ba2 (annotated)

media/libyuv/source/rotate_argb.cc