1 #include "libscaler-swscaler.h"
2 
Clear()3 void CScalerSW::Clear() {
4     m_pSrc[0] = NULL;
5     m_pSrc[1] = NULL;
6     m_pSrc[2] = NULL;
7     m_pDst[0] = NULL;
8     m_pDst[1] = NULL;
9     m_pDst[2] = NULL;
10 
11     m_nSrcLeft = 0;
12     m_nSrcTop = 0;
13     m_nSrcWidth = 0;
14     m_nSrcHeight = 0;
15     m_nSrcStride = 0;
16     m_nDstLeft = 0;
17     m_nDstTop = 0;
18     m_nDstWidth = 0;
19     m_nDstHeight = 0;
20     m_nDstStride = 0;
21 }
22 
Scale()23 bool CScalerSW_YUYV::Scale() {
24     if (((m_nSrcLeft | m_nSrcWidth | m_nDstWidth | m_nSrcStride) % 2) != 0) {
25         SC_LOGE("Width of YUV422 should be even");
26         return false;
27     }
28 
29     unsigned int h_ratio = (m_nSrcWidth << 16) / m_nDstWidth;
30     unsigned int v_ratio = (m_nSrcHeight << 16) / m_nDstHeight;
31 
32     unsigned int src_x;
33     unsigned int src_y = m_nSrcTop << 16;
34 
35     // Luminance + Chrominance at once
36     for (unsigned int y = m_nDstTop; y < (m_nDstTop + m_nDstHeight); y++) {
37         src_x = m_nSrcLeft << 16;
38         for (unsigned int x = m_nDstLeft; x < (m_nDstLeft + m_nDstWidth); x++) {
39             m_pDst[0][y * (m_nDstStride * 2) + x * 2] =
40                 m_pSrc[0][(src_y >> 16) * (m_nSrcStride * 2) + (src_x >> 16) * 2];
41 
42             if (!(x & 1)) {
43                 unsigned int cx = (src_x >> 16) & ~1;
44 
45                 m_pDst[0][y * (m_nDstStride * 2) + x * 2 + 1] =
46                     m_pSrc[0][(src_y >> 16) * (m_nSrcStride * 2) + cx * 2 + 1];
47                 m_pDst[0][y * (m_nDstStride * 2) + x * 2 + 3] =
48                     m_pSrc[0][(src_y >> 16) * (m_nSrcStride * 2) + cx * 2 + 3];
49 
50             }
51 
52             src_x = LibScaler::min(src_x + h_ratio, (m_nSrcLeft + m_nSrcWidth) << 16);
53         }
54 
55         src_y = LibScaler::min(src_y + v_ratio, (m_nSrcTop + m_nSrcHeight) << 16);
56     }
57 
58     return true;
59 }
60 
Scale()61 bool CScalerSW_NV12::Scale() {
62     if (((m_nSrcLeft | m_nSrcTop | m_nSrcWidth | m_nSrcHeight | m_nSrcStride |
63                     m_nDstLeft | m_nDstTop | m_nDstWidth | m_nDstHeight | m_nDstStride) % 2) != 0) {
64         SC_LOGE("Both of width and height of YUV420 should be even");
65         return false;
66     }
67 
68     unsigned int h_ratio = (m_nSrcWidth << 16) / m_nDstWidth;
69     unsigned int v_ratio = (m_nSrcHeight << 16) / m_nDstHeight;
70 
71     unsigned int src_x;
72     unsigned int src_y = m_nSrcTop << 16;
73 
74     // Luminance
75     for (unsigned int y = m_nDstTop; y < (m_nDstTop + m_nDstHeight); y++) {
76         src_x = m_nSrcLeft << 16;
77         for (unsigned int x = m_nDstLeft; x < (m_nDstLeft + m_nDstWidth); x++) {
78             m_pDst[0][y * m_nDstStride + x] = m_pSrc[0][(src_y >> 16) * m_nSrcStride + (src_x >> 16)];
79 
80             src_x = LibScaler::min(src_x + h_ratio, (m_nSrcLeft + m_nSrcWidth) << 16);
81         }
82 
83         src_y = LibScaler::min(src_y + v_ratio, (m_nSrcTop + m_nSrcHeight) << 16);
84     }
85 
86     // Chrominance
87 
88     // change pointers to 1-byte to pointers to 2-byte storage.
89     unsigned short *src = reinterpret_cast<unsigned short *>(m_pSrc[1]);
90     unsigned short *dst = reinterpret_cast<unsigned short *>(m_pDst[1]);
91 
92     src_y = (m_nSrcTop / 2) << 16;
93     for (unsigned int y = m_nDstTop / 2; y < ((m_nDstTop + m_nDstHeight) / 2); y++) {
94         // Move 2 pixels at once (CbCr)
95         src_x = (m_nSrcLeft / 2) << 16;
96         for (unsigned int x = m_nDstLeft / 2; x < ((m_nDstLeft + m_nDstWidth) / 2); x++) {
97             dst[y * (m_nDstStride / 2) + x] = src[(src_y >> 16) * (m_nSrcStride / 2) + (src_x >> 16)];
98 
99             src_x = LibScaler::min(src_x + h_ratio, ((m_nSrcLeft + m_nSrcWidth) / 2) << 16);
100         }
101 
102         src_y = LibScaler::min(src_y + v_ratio, ((m_nSrcTop + m_nSrcHeight) / 2) << 16);
103     }
104 
105     return true;
106 }
107