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Detect Endian of ARGB image.

Browse Source 
BUG=375
TESTED=libyuv builds, but no test app for it yet
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/32389004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1154 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
fbarchard@google.com 2014-11-05 18:46:06 +00:00
parent bb3a4b41e9
commit b661b3ee0d
3 changed files with 69 additions and 0 deletions
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5
include/libyuv/compare.h
View File

@ -22,6 +22,11 @@ extern "C" {
LIBYUV_API
uint32 HashDjb2(const uint8* src, uint64 count, uint32 seed);
// Scan an opaque argb image and return fourcc based on alpha offset.
// Returns FOURCC_ARGB, FOURCC_BGRA, or 0 if unknown.
LIBYUV_API
uint32 ARGBDetect(const uint8* argb, int stride_argb, int width, int height);
// Sum Square Error - used to compute Mean Square Error or PSNR.
LIBYUV_API
uint64 ComputeSumSquareError(const uint8* src_a,

35
source/compare.cc
View File

@ -19,6 +19,7 @@
#include "libyuv/basic_types.h"
#include "libyuv/cpu_id.h"
#include "libyuv/row.h"
#include "libyuv/video_common.h"
#ifdef __cplusplus
namespace libyuv {
@ -78,6 +79,40 @@ uint32 HashDjb2(const uint8* src, uint64 count, uint32 seed) {
return seed;
}
static uint32 ARGBDetectRow_C(const uint8* argb, int width) {
int x;
for (x = 0; x < width; ++x) {
if (argb[0] != 255) { // First byte is not Alpha of 255, so not ARGB.
return FOURCC_BGRA;
}
if (argb[3] != 255) { // 4th byte is not Alpha of 255, so not BGRA.
return FOURCC_ARGB;
}
argb += 4;
}
return 0;
}
// Scan an opaque argb image and return fourcc based on alpha offset.
// Returns FOURCC_ARGB, FOURCC_BGRA, or 0 if unknown.
LIBYUV_API
uint32 ARGBDetect(const uint8* argb, int stride_argb, int width, int height) {
uint32 fourcc = 0;
int h;
// Coalesce rows.
if (stride_argb == width * 4) {
width *= height;
height = 1;
stride_argb = 0;
}
for (h = 0; h < height && fourcc == 0; ++h) {
fourcc = ARGBDetectRow_C(argb, width);
argb += stride_argb;
}
return fourcc;
}
uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count);
#if !defined(LIBYUV_DISABLE_NEON) && \
(defined(__ARM_NEON__) || defined(LIBYUV_NEON) || defined(__aarch64__))

29
unit_test/compare_test.cc
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@ -17,6 +17,7 @@
#include "libyuv/compare.h"
#include "libyuv/cpu_id.h"
#include "libyuv/row.h"
#include "libyuv/video_common.h"
namespace libyuv {
@ -146,6 +147,34 @@ TEST_F(libyuvTest, BenchmarkDjb2_Unaligned) {
free_aligned_buffer_64(src_a);
}
TEST_F(libyuvTest, BenchmarkARGBDetect_Opt) {
uint32 fourcc;
const int kMaxTest = benchmark_width_ * benchmark_height_ * 4;
align_buffer_64(src_a, kMaxTest);
for (int i = 0; i < kMaxTest; ++i) {
src_a[i] = 255;
}
src_a[0] = 0;
fourcc = ARGBDetect(src_a, benchmark_width_ * 4,
benchmark_width_, benchmark_height_);
EXPECT_EQ(libyuv::FOURCC_BGRA, fourcc);
src_a[0] = 255;
src_a[3] = 0;
fourcc = ARGBDetect(src_a, benchmark_width_ * 4,
benchmark_width_, benchmark_height_);
EXPECT_EQ(libyuv::FOURCC_ARGB, fourcc);
src_a[3] = 255;
for (int i = 0; i < benchmark_iterations_; ++i) {
fourcc = ARGBDetect(src_a, benchmark_width_ * 4,
benchmark_width_, benchmark_height_);
}
EXPECT_EQ(0, fourcc);
free_aligned_buffer_64(src_a);
}
TEST_F(libyuvTest, BenchmarkSumSquareError_Opt) {
const int kMaxWidth = 4096 * 3;
align_buffer_64(src_a, kMaxWidth);