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Diffstat (limited to 'drivers/webpold/utils/rescaler.c')
| -rw-r--r-- | drivers/webpold/utils/rescaler.c | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/drivers/webpold/utils/rescaler.c b/drivers/webpold/utils/rescaler.c deleted file mode 100644 index 9825dcbc5f..0000000000 --- a/drivers/webpold/utils/rescaler.c +++ /dev/null @@ -1,152 +0,0 @@ -// Copyright 2012 Google Inc. All Rights Reserved. -// -// This code is licensed under the same terms as WebM: -// Software License Agreement: http://www.webmproject.org/license/software/ -// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ -// ----------------------------------------------------------------------------- -// -// Rescaling functions -// -// Author: Skal (pascal.massimino@gmail.com) - -#include <assert.h> -#include <stdlib.h> -#include "./rescaler.h" - -//------------------------------------------------------------------------------ - -#if defined(__cplusplus) || defined(c_plusplus) -extern "C" { -#endif - -#define RFIX 30 -#define MULT_FIX(x,y) (((int64_t)(x) * (y) + (1 << (RFIX - 1))) >> RFIX) - -void WebPRescalerInit(WebPRescaler* const wrk, int src_width, int src_height, - uint8_t* const dst, int dst_width, int dst_height, - int dst_stride, int num_channels, int x_add, int x_sub, - int y_add, int y_sub, int32_t* const work) { - wrk->x_expand = (src_width < dst_width); - wrk->src_width = src_width; - wrk->src_height = src_height; - wrk->dst_width = dst_width; - wrk->dst_height = dst_height; - wrk->dst = dst; - wrk->dst_stride = dst_stride; - wrk->num_channels = num_channels; - // for 'x_expand', we use bilinear interpolation - wrk->x_add = wrk->x_expand ? (x_sub - 1) : x_add - x_sub; - wrk->x_sub = wrk->x_expand ? (x_add - 1) : x_sub; - wrk->y_accum = y_add; - wrk->y_add = y_add; - wrk->y_sub = y_sub; - wrk->fx_scale = (1 << RFIX) / x_sub; - wrk->fy_scale = (1 << RFIX) / y_sub; - wrk->fxy_scale = wrk->x_expand ? - ((int64_t)dst_height << RFIX) / (x_sub * src_height) : - ((int64_t)dst_height << RFIX) / (x_add * src_height); - wrk->irow = work; - wrk->frow = work + num_channels * dst_width; -} - -void WebPRescalerImportRow(WebPRescaler* const wrk, - const uint8_t* const src, int channel) { - const int x_stride = wrk->num_channels; - const int x_out_max = wrk->dst_width * wrk->num_channels; - int x_in = channel; - int x_out; - int accum = 0; - if (!wrk->x_expand) { - int sum = 0; - for (x_out = channel; x_out < x_out_max; x_out += x_stride) { - accum += wrk->x_add; - for (; accum > 0; accum -= wrk->x_sub) { - sum += src[x_in]; - x_in += x_stride; - } - { // Emit next horizontal pixel. - const int32_t base = src[x_in]; - const int32_t frac = base * (-accum); - x_in += x_stride; - wrk->frow[x_out] = (sum + base) * wrk->x_sub - frac; - // fresh fractional start for next pixel - sum = (int)MULT_FIX(frac, wrk->fx_scale); - } - } - } else { // simple bilinear interpolation - int left = src[channel], right = src[channel]; - for (x_out = channel; x_out < x_out_max; x_out += x_stride) { - if (accum < 0) { - left = right; - x_in += x_stride; - right = src[x_in]; - accum += wrk->x_add; - } - wrk->frow[x_out] = right * wrk->x_add + (left - right) * accum; - accum -= wrk->x_sub; - } - } - // Accumulate the new row's contribution - for (x_out = channel; x_out < x_out_max; x_out += x_stride) { - wrk->irow[x_out] += wrk->frow[x_out]; - } -} - -uint8_t* WebPRescalerExportRow(WebPRescaler* const wrk) { - if (wrk->y_accum <= 0) { - int x_out; - uint8_t* const dst = wrk->dst; - int32_t* const irow = wrk->irow; - const int32_t* const frow = wrk->frow; - const int yscale = wrk->fy_scale * (-wrk->y_accum); - const int x_out_max = wrk->dst_width * wrk->num_channels; - - for (x_out = 0; x_out < x_out_max; ++x_out) { - const int frac = (int)MULT_FIX(frow[x_out], yscale); - const int v = (int)MULT_FIX(irow[x_out] - frac, wrk->fxy_scale); - dst[x_out] = (!(v & ~0xff)) ? v : (v < 0) ? 0 : 255; - irow[x_out] = frac; // new fractional start - } - wrk->y_accum += wrk->y_add; - wrk->dst += wrk->dst_stride; - return dst; - } else { - return NULL; - } -} - -#undef MULT_FIX -#undef RFIX - -//------------------------------------------------------------------------------ -// all-in-one calls - -int WebPRescalerImport(WebPRescaler* const wrk, int num_lines, - const uint8_t* src, int src_stride) { - int total_imported = 0; - while (total_imported < num_lines && wrk->y_accum > 0) { - int channel; - for (channel = 0; channel < wrk->num_channels; ++channel) { - WebPRescalerImportRow(wrk, src, channel); - } - src += src_stride; - ++total_imported; - wrk->y_accum -= wrk->y_sub; - } - return total_imported; -} - -int WebPRescalerExport(WebPRescaler* const rescaler) { - int total_exported = 0; - while (WebPRescalerHasPendingOutput(rescaler)) { - WebPRescalerExportRow(rescaler); - ++total_exported; - } - return total_exported; -} - -//------------------------------------------------------------------------------ - -#if defined(__cplusplus) || defined(c_plusplus) -} // extern "C" -#endif |