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Avoid memcpy.

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BUG=176
TEST=NONE
Review URL: https://webrtc-codereview.appspot.com/1081004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@552 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
fbarchard@google.com 2013-01-26 07:29:08 +00:00
parent 573a883dd6
commit 9e4e12352a
1 changed files with 10 additions and 15 deletions
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25
source/mjpeg_decoder.cc
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@ -9,6 +9,7 @@
*/ */
#include "libyuv/mjpeg_decoder.h" #include "libyuv/mjpeg_decoder.h"
#include "libyuv/planar_functions.h" // For CopyPlane().
#ifdef HAVE_JPEG #ifdef HAVE_JPEG
// Must be included before jpeglib // Must be included before jpeglib
@ -254,15 +255,6 @@ bool MJpegDecoder::UnloadFrame() {
return true; return true;
} }
static void CopyRows(uint8* source, int source_stride,
uint8* dest, int pixels, int numrows) {
for (int i = 0; i < numrows; ++i) {
memcpy(dest, source, pixels);
dest += pixels;
source += source_stride;
}
}
// TODO(fbarchard): Allow rectangle to be specified: x, y, width, height. // TODO(fbarchard): Allow rectangle to be specified: x, y, width, height.
bool MJpegDecoder::DecodeToBuffers( bool MJpegDecoder::DecodeToBuffers(
uint8** planes, int dst_width, int dst_height) { uint8** planes, int dst_width, int dst_height) {
@ -313,8 +305,9 @@ bool MJpegDecoder::DecodeToBuffers(
int scanlines_to_copy = GetComponentScanlinesPerImcuRow(i) - int scanlines_to_copy = GetComponentScanlinesPerImcuRow(i) -
rows_to_skip; rows_to_skip;
int data_to_skip = rows_to_skip * GetComponentStride(i); int data_to_skip = rows_to_skip * GetComponentStride(i);
CopyRows(databuf_[i] + data_to_skip, GetComponentStride(i), CopyPlane(databuf_[i] + data_to_skip, GetComponentStride(i),
planes[i], GetComponentWidth(i), scanlines_to_copy); planes[i], GetComponentWidth(i),
GetComponentWidth(i), scanlines_to_copy);
planes[i] += scanlines_to_copy * GetComponentWidth(i); planes[i] += scanlines_to_copy * GetComponentWidth(i);
} }
lines_left -= (GetImageScanlinesPerImcuRow() - skip); lines_left -= (GetImageScanlinesPerImcuRow() - skip);
@ -330,8 +323,9 @@ bool MJpegDecoder::DecodeToBuffers(
} }
for (int i = 0; i < num_outbufs_; ++i) { for (int i = 0; i < num_outbufs_; ++i) {
int scanlines_to_copy = GetComponentScanlinesPerImcuRow(i); int scanlines_to_copy = GetComponentScanlinesPerImcuRow(i);
CopyRows(databuf_[i], GetComponentStride(i), CopyPlane(databuf_[i], GetComponentStride(i),
planes[i], GetComponentWidth(i), scanlines_to_copy); planes[i], GetComponentWidth(i),
GetComponentWidth(i), scanlines_to_copy);
planes[i] += scanlines_to_copy * GetComponentWidth(i); planes[i] += scanlines_to_copy * GetComponentWidth(i);
} }
} }
@ -345,8 +339,9 @@ bool MJpegDecoder::DecodeToBuffers(
for (int i = 0; i < num_outbufs_; ++i) { for (int i = 0; i < num_outbufs_; ++i) {
int scanlines_to_copy = int scanlines_to_copy =
DivideAndRoundUp(lines_left, GetVertSubSampFactor(i)); DivideAndRoundUp(lines_left, GetVertSubSampFactor(i));
CopyRows(databuf_[i], GetComponentStride(i), CopyPlane(databuf_[i], GetComponentStride(i),
planes[i], GetComponentWidth(i), scanlines_to_copy); planes[i], GetComponentWidth(i),
GetComponentWidth(i), scanlines_to_copy);
planes[i] += scanlines_to_copy * GetComponentWidth(i); planes[i] += scanlines_to_copy * GetComponentWidth(i);
} }
} }