25 void WebPRescalerInit(WebPRescaler* const wrk, int src_width, int src_height,  in WebPRescalerInit()  argument
29   wrk->x_expand = (src_width < dst_width);  in WebPRescalerInit()
30   wrk->src_width = src_width;  in WebPRescalerInit()
31   wrk->src_height = src_height;  in WebPRescalerInit()
32   wrk->dst_width = dst_width;  in WebPRescalerInit()
33   wrk->dst_height = dst_height;  in WebPRescalerInit()
34   wrk->dst = dst;  in WebPRescalerInit()
35   wrk->dst_stride = dst_stride;  in WebPRescalerInit()
36   wrk->num_channels = num_channels;  in WebPRescalerInit()
38   wrk->x_add = wrk->x_expand ? (x_sub - 1) : x_add - x_sub;  in WebPRescalerInit()
39   wrk->x_sub = wrk->x_expand ? (x_add - 1) : x_sub;  in WebPRescalerInit()
40   wrk->y_accum = y_add;  in WebPRescalerInit()
41   wrk->y_add = y_add;  in WebPRescalerInit()
42   wrk->y_sub = y_sub;  in WebPRescalerInit()
43   wrk->fx_scale = (1 << RFIX) / x_sub;  in WebPRescalerInit()
44   wrk->fy_scale = (1 << RFIX) / y_sub;  in WebPRescalerInit()
45   wrk->fxy_scale = wrk->x_expand ?  in WebPRescalerInit()
48   wrk->irow = work;  in WebPRescalerInit()
49   wrk->frow = work + num_channels * dst_width;  in WebPRescalerInit()
52 void WebPRescalerImportRow(WebPRescaler* const wrk,  in WebPRescalerImportRow()  argument
54   const int x_stride = wrk->num_channels;  in WebPRescalerImportRow()
55   const int x_out_max = wrk->dst_width * wrk->num_channels;  in WebPRescalerImportRow()
59   if (!wrk->x_expand) {  in WebPRescalerImportRow()
62       accum += wrk->x_add;  in WebPRescalerImportRow()
63       for (; accum > 0; accum -= wrk->x_sub) {  in WebPRescalerImportRow()
71         wrk->frow[x_out] = (sum + base) * wrk->x_sub - frac;  in WebPRescalerImportRow()
73         sum = (int)MULT_FIX(frac, wrk->fx_scale);  in WebPRescalerImportRow()
83         accum += wrk->x_add;  in WebPRescalerImportRow()
85       wrk->frow[x_out] = right * wrk->x_add + (left - right) * accum;  in WebPRescalerImportRow()
86       accum -= wrk->x_sub;  in WebPRescalerImportRow()
91     wrk->irow[x_out] += wrk->frow[x_out];  in WebPRescalerImportRow()
95 uint8_t* WebPRescalerExportRow(WebPRescaler* const wrk) {  in WebPRescalerExportRow()  argument
96   if (wrk->y_accum <= 0) {  in WebPRescalerExportRow()
98     uint8_t* const dst = wrk->dst;  in WebPRescalerExportRow()
99     int32_t* const irow = wrk->irow;  in WebPRescalerExportRow()
100     const int32_t* const frow = wrk->frow;  in WebPRescalerExportRow()
101     const int yscale = wrk->fy_scale * (-wrk->y_accum);  in WebPRescalerExportRow()
102     const int x_out_max = wrk->dst_width * wrk->num_channels;  in WebPRescalerExportRow()
106       const int v = (int)MULT_FIX(irow[x_out] - frac, wrk->fxy_scale);  in WebPRescalerExportRow()
110     wrk->y_accum += wrk->y_add;  in WebPRescalerExportRow()
111     wrk->dst += wrk->dst_stride;  in WebPRescalerExportRow()
124 int WebPRescalerImport(WebPRescaler* const wrk, int num_lines,  in WebPRescalerImport()  argument
127   while (total_imported < num_lines && wrk->y_accum > 0) {  in WebPRescalerImport()
129     for (channel = 0; channel < wrk->num_channels; ++channel) {  in WebPRescalerImport()
130       WebPRescalerImportRow(wrk, src, channel);  in WebPRescalerImport()
134     wrk->y_accum -= wrk->y_sub;  in WebPRescalerImport()