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648 lines
22 KiB
C
648 lines
22 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// functions for sample output.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <assert.h>
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#include <stdlib.h>
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#include "../dec/vp8i.h"
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#include "./webpi.h"
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#include "../dsp/dsp.h"
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#include "../dsp/yuv.h"
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#include "../utils/utils.h"
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//------------------------------------------------------------------------------
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// Main YUV<->RGB conversion functions
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static int EmitYUV(const VP8Io* const io, WebPDecParams* const p) {
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WebPDecBuffer* output = p->output;
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const WebPYUVABuffer* const buf = &output->u.YUVA;
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uint8_t* const y_dst = buf->y + io->mb_y * buf->y_stride;
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uint8_t* const u_dst = buf->u + (io->mb_y >> 1) * buf->u_stride;
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uint8_t* const v_dst = buf->v + (io->mb_y >> 1) * buf->v_stride;
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const int mb_w = io->mb_w;
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const int mb_h = io->mb_h;
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const int uv_w = (mb_w + 1) / 2;
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const int uv_h = (mb_h + 1) / 2;
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int j;
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for (j = 0; j < mb_h; ++j) {
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memcpy(y_dst + j * buf->y_stride, io->y + j * io->y_stride, mb_w);
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}
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for (j = 0; j < uv_h; ++j) {
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memcpy(u_dst + j * buf->u_stride, io->u + j * io->uv_stride, uv_w);
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memcpy(v_dst + j * buf->v_stride, io->v + j * io->uv_stride, uv_w);
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}
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return io->mb_h;
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}
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// Point-sampling U/V sampler.
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static int EmitSampledRGB(const VP8Io* const io, WebPDecParams* const p) {
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WebPDecBuffer* const output = p->output;
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WebPRGBABuffer* const buf = &output->u.RGBA;
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uint8_t* const dst = buf->rgba + io->mb_y * buf->stride;
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WebPSamplerProcessPlane(io->y, io->y_stride,
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io->u, io->v, io->uv_stride,
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dst, buf->stride, io->mb_w, io->mb_h,
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WebPSamplers[output->colorspace]);
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return io->mb_h;
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}
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//------------------------------------------------------------------------------
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// YUV444 -> RGB conversion
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#if 0 // TODO(skal): this is for future rescaling.
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static int EmitRGB(const VP8Io* const io, WebPDecParams* const p) {
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WebPDecBuffer* output = p->output;
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const WebPRGBABuffer* const buf = &output->u.RGBA;
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uint8_t* dst = buf->rgba + io->mb_y * buf->stride;
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const uint8_t* y_src = io->y;
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const uint8_t* u_src = io->u;
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const uint8_t* v_src = io->v;
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const WebPYUV444Converter convert = WebPYUV444Converters[output->colorspace];
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const int mb_w = io->mb_w;
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const int last = io->mb_h;
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int j;
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for (j = 0; j < last; ++j) {
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convert(y_src, u_src, v_src, dst, mb_w);
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y_src += io->y_stride;
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u_src += io->uv_stride;
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v_src += io->uv_stride;
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dst += buf->stride;
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}
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return io->mb_h;
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}
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#endif
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//------------------------------------------------------------------------------
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// Fancy upsampling
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#ifdef FANCY_UPSAMPLING
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static int EmitFancyRGB(const VP8Io* const io, WebPDecParams* const p) {
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int num_lines_out = io->mb_h; // a priori guess
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const WebPRGBABuffer* const buf = &p->output->u.RGBA;
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uint8_t* dst = buf->rgba + io->mb_y * buf->stride;
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WebPUpsampleLinePairFunc upsample = WebPUpsamplers[p->output->colorspace];
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const uint8_t* cur_y = io->y;
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const uint8_t* cur_u = io->u;
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const uint8_t* cur_v = io->v;
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const uint8_t* top_u = p->tmp_u;
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const uint8_t* top_v = p->tmp_v;
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int y = io->mb_y;
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const int y_end = io->mb_y + io->mb_h;
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const int mb_w = io->mb_w;
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const int uv_w = (mb_w + 1) / 2;
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if (y == 0) {
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// First line is special cased. We mirror the u/v samples at boundary.
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upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v, dst, NULL, mb_w);
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} else {
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// We can finish the left-over line from previous call.
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upsample(p->tmp_y, cur_y, top_u, top_v, cur_u, cur_v,
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dst - buf->stride, dst, mb_w);
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++num_lines_out;
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}
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// Loop over each output pairs of row.
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for (; y + 2 < y_end; y += 2) {
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top_u = cur_u;
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top_v = cur_v;
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cur_u += io->uv_stride;
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cur_v += io->uv_stride;
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dst += 2 * buf->stride;
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cur_y += 2 * io->y_stride;
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upsample(cur_y - io->y_stride, cur_y,
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top_u, top_v, cur_u, cur_v,
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dst - buf->stride, dst, mb_w);
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}
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// move to last row
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cur_y += io->y_stride;
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if (io->crop_top + y_end < io->crop_bottom) {
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// Save the unfinished samples for next call (as we're not done yet).
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memcpy(p->tmp_y, cur_y, mb_w * sizeof(*p->tmp_y));
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memcpy(p->tmp_u, cur_u, uv_w * sizeof(*p->tmp_u));
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memcpy(p->tmp_v, cur_v, uv_w * sizeof(*p->tmp_v));
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// The fancy upsampler leaves a row unfinished behind
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// (except for the very last row)
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num_lines_out--;
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} else {
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// Process the very last row of even-sized picture
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if (!(y_end & 1)) {
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upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v,
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dst + buf->stride, NULL, mb_w);
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}
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}
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return num_lines_out;
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}
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#endif /* FANCY_UPSAMPLING */
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//------------------------------------------------------------------------------
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static int EmitAlphaYUV(const VP8Io* const io, WebPDecParams* const p) {
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const uint8_t* alpha = io->a;
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const WebPYUVABuffer* const buf = &p->output->u.YUVA;
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const int mb_w = io->mb_w;
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const int mb_h = io->mb_h;
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uint8_t* dst = buf->a + io->mb_y * buf->a_stride;
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int j;
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if (alpha != NULL) {
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for (j = 0; j < mb_h; ++j) {
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memcpy(dst, alpha, mb_w * sizeof(*dst));
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alpha += io->width;
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dst += buf->a_stride;
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}
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} else if (buf->a != NULL) {
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// the user requested alpha, but there is none, set it to opaque.
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for (j = 0; j < mb_h; ++j) {
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memset(dst, 0xff, mb_w * sizeof(*dst));
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dst += buf->a_stride;
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}
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}
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return 0;
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}
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static int GetAlphaSourceRow(const VP8Io* const io,
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const uint8_t** alpha, int* const num_rows) {
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int start_y = io->mb_y;
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*num_rows = io->mb_h;
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// Compensate for the 1-line delay of the fancy upscaler.
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// This is similar to EmitFancyRGB().
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if (io->fancy_upsampling) {
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if (start_y == 0) {
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// We don't process the last row yet. It'll be done during the next call.
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--*num_rows;
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} else {
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--start_y;
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// Fortunately, *alpha data is persistent, so we can go back
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// one row and finish alpha blending, now that the fancy upscaler
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// completed the YUV->RGB interpolation.
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*alpha -= io->width;
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}
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if (io->crop_top + io->mb_y + io->mb_h == io->crop_bottom) {
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// If it's the very last call, we process all the remaining rows!
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*num_rows = io->crop_bottom - io->crop_top - start_y;
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}
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}
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return start_y;
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}
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static int EmitAlphaRGB(const VP8Io* const io, WebPDecParams* const p) {
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const uint8_t* alpha = io->a;
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if (alpha != NULL) {
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const int mb_w = io->mb_w;
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const WEBP_CSP_MODE colorspace = p->output->colorspace;
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const int alpha_first =
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(colorspace == MODE_ARGB || colorspace == MODE_Argb);
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const WebPRGBABuffer* const buf = &p->output->u.RGBA;
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int num_rows;
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const int start_y = GetAlphaSourceRow(io, &alpha, &num_rows);
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uint8_t* const base_rgba = buf->rgba + start_y * buf->stride;
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uint8_t* dst = base_rgba + (alpha_first ? 0 : 3);
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uint32_t alpha_mask = 0xff;
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int i, j;
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for (j = 0; j < num_rows; ++j) {
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for (i = 0; i < mb_w; ++i) {
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const uint32_t alpha_value = alpha[i];
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dst[4 * i] = alpha_value;
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alpha_mask &= alpha_value;
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}
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alpha += io->width;
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dst += buf->stride;
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}
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// alpha_mask is < 0xff if there's non-trivial alpha to premultiply with.
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if (alpha_mask != 0xff && WebPIsPremultipliedMode(colorspace)) {
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WebPApplyAlphaMultiply(base_rgba, alpha_first,
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mb_w, num_rows, buf->stride);
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}
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}
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return 0;
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}
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static int EmitAlphaRGBA4444(const VP8Io* const io, WebPDecParams* const p) {
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const uint8_t* alpha = io->a;
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if (alpha != NULL) {
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const int mb_w = io->mb_w;
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const WEBP_CSP_MODE colorspace = p->output->colorspace;
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const WebPRGBABuffer* const buf = &p->output->u.RGBA;
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int num_rows;
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const int start_y = GetAlphaSourceRow(io, &alpha, &num_rows);
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uint8_t* const base_rgba = buf->rgba + start_y * buf->stride;
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#ifdef WEBP_SWAP_16BIT_CSP
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uint8_t* alpha_dst = base_rgba;
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#else
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uint8_t* alpha_dst = base_rgba + 1;
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#endif
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uint32_t alpha_mask = 0x0f;
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int i, j;
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for (j = 0; j < num_rows; ++j) {
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for (i = 0; i < mb_w; ++i) {
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// Fill in the alpha value (converted to 4 bits).
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const uint32_t alpha_value = alpha[i] >> 4;
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alpha_dst[2 * i] = (alpha_dst[2 * i] & 0xf0) | alpha_value;
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alpha_mask &= alpha_value;
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}
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alpha += io->width;
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alpha_dst += buf->stride;
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}
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if (alpha_mask != 0x0f && WebPIsPremultipliedMode(colorspace)) {
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WebPApplyAlphaMultiply4444(base_rgba, mb_w, num_rows, buf->stride);
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}
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}
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return 0;
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}
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//------------------------------------------------------------------------------
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// YUV rescaling (no final RGB conversion needed)
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static int Rescale(const uint8_t* src, int src_stride,
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int new_lines, WebPRescaler* const wrk) {
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int num_lines_out = 0;
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while (new_lines > 0) { // import new contributions of source rows.
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const int lines_in = WebPRescalerImport(wrk, new_lines, src, src_stride);
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src += lines_in * src_stride;
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new_lines -= lines_in;
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num_lines_out += WebPRescalerExport(wrk); // emit output row(s)
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}
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return num_lines_out;
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}
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static int EmitRescaledYUV(const VP8Io* const io, WebPDecParams* const p) {
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const int mb_h = io->mb_h;
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const int uv_mb_h = (mb_h + 1) >> 1;
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WebPRescaler* const scaler = &p->scaler_y;
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int num_lines_out = 0;
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if (WebPIsAlphaMode(p->output->colorspace) && io->a != NULL) {
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// Before rescaling, we premultiply the luma directly into the io->y
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// internal buffer. This is OK since these samples are not used for
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// intra-prediction (the top samples are saved in cache_y_/u_/v_).
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// But we need to cast the const away, though.
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WebPMultRows((uint8_t*)io->y, io->y_stride,
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io->a, io->width, io->mb_w, mb_h, 0);
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}
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num_lines_out = Rescale(io->y, io->y_stride, mb_h, scaler);
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Rescale(io->u, io->uv_stride, uv_mb_h, &p->scaler_u);
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Rescale(io->v, io->uv_stride, uv_mb_h, &p->scaler_v);
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return num_lines_out;
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}
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static int EmitRescaledAlphaYUV(const VP8Io* const io, WebPDecParams* const p) {
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if (io->a != NULL) {
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const WebPYUVABuffer* const buf = &p->output->u.YUVA;
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uint8_t* dst_y = buf->y + p->last_y * buf->y_stride;
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const uint8_t* src_a = buf->a + p->last_y * buf->a_stride;
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const int num_lines_out = Rescale(io->a, io->width, io->mb_h, &p->scaler_a);
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if (num_lines_out > 0) { // unmultiply the Y
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WebPMultRows(dst_y, buf->y_stride, src_a, buf->a_stride,
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p->scaler_a.dst_width, num_lines_out, 1);
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}
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}
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return 0;
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}
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static int InitYUVRescaler(const VP8Io* const io, WebPDecParams* const p) {
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const int has_alpha = WebPIsAlphaMode(p->output->colorspace);
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const WebPYUVABuffer* const buf = &p->output->u.YUVA;
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const int out_width = io->scaled_width;
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const int out_height = io->scaled_height;
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const int uv_out_width = (out_width + 1) >> 1;
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const int uv_out_height = (out_height + 1) >> 1;
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const int uv_in_width = (io->mb_w + 1) >> 1;
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const int uv_in_height = (io->mb_h + 1) >> 1;
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const size_t work_size = 2 * out_width; // scratch memory for luma rescaler
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const size_t uv_work_size = 2 * uv_out_width; // and for each u/v ones
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size_t tmp_size;
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int32_t* work;
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tmp_size = (work_size + 2 * uv_work_size) * sizeof(*work);
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if (has_alpha) {
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tmp_size += work_size * sizeof(*work);
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}
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p->memory = WebPSafeCalloc(1ULL, tmp_size);
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if (p->memory == NULL) {
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return 0; // memory error
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}
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work = (int32_t*)p->memory;
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WebPRescalerInit(&p->scaler_y, io->mb_w, io->mb_h,
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buf->y, out_width, out_height, buf->y_stride, 1,
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io->mb_w, out_width, io->mb_h, out_height,
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work);
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WebPRescalerInit(&p->scaler_u, uv_in_width, uv_in_height,
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buf->u, uv_out_width, uv_out_height, buf->u_stride, 1,
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uv_in_width, uv_out_width,
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uv_in_height, uv_out_height,
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work + work_size);
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WebPRescalerInit(&p->scaler_v, uv_in_width, uv_in_height,
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buf->v, uv_out_width, uv_out_height, buf->v_stride, 1,
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uv_in_width, uv_out_width,
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uv_in_height, uv_out_height,
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work + work_size + uv_work_size);
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p->emit = EmitRescaledYUV;
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if (has_alpha) {
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WebPRescalerInit(&p->scaler_a, io->mb_w, io->mb_h,
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buf->a, out_width, out_height, buf->a_stride, 1,
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io->mb_w, out_width, io->mb_h, out_height,
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work + work_size + 2 * uv_work_size);
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p->emit_alpha = EmitRescaledAlphaYUV;
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WebPInitAlphaProcessing();
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}
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return 1;
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}
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//------------------------------------------------------------------------------
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// RGBA rescaling
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static int ExportRGB(WebPDecParams* const p, int y_pos) {
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const WebPYUV444Converter convert =
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WebPYUV444Converters[p->output->colorspace];
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const WebPRGBABuffer* const buf = &p->output->u.RGBA;
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uint8_t* dst = buf->rgba + (p->last_y + y_pos) * buf->stride;
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int num_lines_out = 0;
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// For RGB rescaling, because of the YUV420, current scan position
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// U/V can be +1/-1 line from the Y one. Hence the double test.
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while (WebPRescalerHasPendingOutput(&p->scaler_y) &&
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WebPRescalerHasPendingOutput(&p->scaler_u)) {
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assert(p->last_y + y_pos + num_lines_out < p->output->height);
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assert(p->scaler_u.y_accum == p->scaler_v.y_accum);
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WebPRescalerExportRow(&p->scaler_y, 0);
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WebPRescalerExportRow(&p->scaler_u, 0);
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WebPRescalerExportRow(&p->scaler_v, 0);
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convert(p->scaler_y.dst, p->scaler_u.dst, p->scaler_v.dst,
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dst, p->scaler_y.dst_width);
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dst += buf->stride;
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++num_lines_out;
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}
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return num_lines_out;
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}
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static int EmitRescaledRGB(const VP8Io* const io, WebPDecParams* const p) {
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const int mb_h = io->mb_h;
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const int uv_mb_h = (mb_h + 1) >> 1;
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int j = 0, uv_j = 0;
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int num_lines_out = 0;
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while (j < mb_h) {
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const int y_lines_in =
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WebPRescalerImport(&p->scaler_y, mb_h - j,
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io->y + j * io->y_stride, io->y_stride);
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const int u_lines_in =
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WebPRescalerImport(&p->scaler_u, uv_mb_h - uv_j,
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io->u + uv_j * io->uv_stride, io->uv_stride);
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const int v_lines_in =
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WebPRescalerImport(&p->scaler_v, uv_mb_h - uv_j,
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io->v + uv_j * io->uv_stride, io->uv_stride);
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(void)v_lines_in; // remove a gcc warning
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assert(u_lines_in == v_lines_in);
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j += y_lines_in;
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uv_j += u_lines_in;
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num_lines_out += ExportRGB(p, num_lines_out);
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}
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return num_lines_out;
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}
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|
static int ExportAlpha(WebPDecParams* const p, int y_pos) {
|
|
const WebPRGBABuffer* const buf = &p->output->u.RGBA;
|
|
uint8_t* const base_rgba = buf->rgba + (p->last_y + y_pos) * buf->stride;
|
|
const WEBP_CSP_MODE colorspace = p->output->colorspace;
|
|
const int alpha_first =
|
|
(colorspace == MODE_ARGB || colorspace == MODE_Argb);
|
|
uint8_t* dst = base_rgba + (alpha_first ? 0 : 3);
|
|
int num_lines_out = 0;
|
|
const int is_premult_alpha = WebPIsPremultipliedMode(colorspace);
|
|
uint32_t alpha_mask = 0xff;
|
|
const int width = p->scaler_a.dst_width;
|
|
|
|
while (WebPRescalerHasPendingOutput(&p->scaler_a)) {
|
|
int i;
|
|
assert(p->last_y + y_pos + num_lines_out < p->output->height);
|
|
WebPRescalerExportRow(&p->scaler_a, 0);
|
|
for (i = 0; i < width; ++i) {
|
|
const uint32_t alpha_value = p->scaler_a.dst[i];
|
|
dst[4 * i] = alpha_value;
|
|
alpha_mask &= alpha_value;
|
|
}
|
|
dst += buf->stride;
|
|
++num_lines_out;
|
|
}
|
|
if (is_premult_alpha && alpha_mask != 0xff) {
|
|
WebPApplyAlphaMultiply(base_rgba, alpha_first,
|
|
width, num_lines_out, buf->stride);
|
|
}
|
|
return num_lines_out;
|
|
}
|
|
|
|
static int ExportAlphaRGBA4444(WebPDecParams* const p, int y_pos) {
|
|
const WebPRGBABuffer* const buf = &p->output->u.RGBA;
|
|
uint8_t* const base_rgba = buf->rgba + (p->last_y + y_pos) * buf->stride;
|
|
#ifdef WEBP_SWAP_16BIT_CSP
|
|
uint8_t* alpha_dst = base_rgba;
|
|
#else
|
|
uint8_t* alpha_dst = base_rgba + 1;
|
|
#endif
|
|
int num_lines_out = 0;
|
|
const WEBP_CSP_MODE colorspace = p->output->colorspace;
|
|
const int width = p->scaler_a.dst_width;
|
|
const int is_premult_alpha = WebPIsPremultipliedMode(colorspace);
|
|
uint32_t alpha_mask = 0x0f;
|
|
|
|
while (WebPRescalerHasPendingOutput(&p->scaler_a)) {
|
|
int i;
|
|
assert(p->last_y + y_pos + num_lines_out < p->output->height);
|
|
WebPRescalerExportRow(&p->scaler_a, 0);
|
|
for (i = 0; i < width; ++i) {
|
|
// Fill in the alpha value (converted to 4 bits).
|
|
const uint32_t alpha_value = p->scaler_a.dst[i] >> 4;
|
|
alpha_dst[2 * i] = (alpha_dst[2 * i] & 0xf0) | alpha_value;
|
|
alpha_mask &= alpha_value;
|
|
}
|
|
alpha_dst += buf->stride;
|
|
++num_lines_out;
|
|
}
|
|
if (is_premult_alpha && alpha_mask != 0x0f) {
|
|
WebPApplyAlphaMultiply4444(base_rgba, width, num_lines_out, buf->stride);
|
|
}
|
|
return num_lines_out;
|
|
}
|
|
|
|
static int EmitRescaledAlphaRGB(const VP8Io* const io, WebPDecParams* const p) {
|
|
if (io->a != NULL) {
|
|
WebPRescaler* const scaler = &p->scaler_a;
|
|
int j = 0;
|
|
int pos = 0;
|
|
while (j < io->mb_h) {
|
|
j += WebPRescalerImport(scaler, io->mb_h - j,
|
|
io->a + j * io->width, io->width);
|
|
pos += p->emit_alpha_row(p, pos);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
|
|
const int has_alpha = WebPIsAlphaMode(p->output->colorspace);
|
|
const int out_width = io->scaled_width;
|
|
const int out_height = io->scaled_height;
|
|
const int uv_in_width = (io->mb_w + 1) >> 1;
|
|
const int uv_in_height = (io->mb_h + 1) >> 1;
|
|
const size_t work_size = 2 * out_width; // scratch memory for one rescaler
|
|
int32_t* work; // rescalers work area
|
|
uint8_t* tmp; // tmp storage for scaled YUV444 samples before RGB conversion
|
|
size_t tmp_size1, tmp_size2, total_size;
|
|
|
|
tmp_size1 = 3 * work_size;
|
|
tmp_size2 = 3 * out_width;
|
|
if (has_alpha) {
|
|
tmp_size1 += work_size;
|
|
tmp_size2 += out_width;
|
|
}
|
|
total_size = tmp_size1 * sizeof(*work) + tmp_size2 * sizeof(*tmp);
|
|
p->memory = WebPSafeCalloc(1ULL, total_size);
|
|
if (p->memory == NULL) {
|
|
return 0; // memory error
|
|
}
|
|
work = (int32_t*)p->memory;
|
|
tmp = (uint8_t*)(work + tmp_size1);
|
|
WebPRescalerInit(&p->scaler_y, io->mb_w, io->mb_h,
|
|
tmp + 0 * out_width, out_width, out_height, 0, 1,
|
|
io->mb_w, out_width, io->mb_h, out_height,
|
|
work + 0 * work_size);
|
|
WebPRescalerInit(&p->scaler_u, uv_in_width, uv_in_height,
|
|
tmp + 1 * out_width, out_width, out_height, 0, 1,
|
|
io->mb_w, 2 * out_width, io->mb_h, 2 * out_height,
|
|
work + 1 * work_size);
|
|
WebPRescalerInit(&p->scaler_v, uv_in_width, uv_in_height,
|
|
tmp + 2 * out_width, out_width, out_height, 0, 1,
|
|
io->mb_w, 2 * out_width, io->mb_h, 2 * out_height,
|
|
work + 2 * work_size);
|
|
p->emit = EmitRescaledRGB;
|
|
|
|
if (has_alpha) {
|
|
WebPRescalerInit(&p->scaler_a, io->mb_w, io->mb_h,
|
|
tmp + 3 * out_width, out_width, out_height, 0, 1,
|
|
io->mb_w, out_width, io->mb_h, out_height,
|
|
work + 3 * work_size);
|
|
p->emit_alpha = EmitRescaledAlphaRGB;
|
|
if (p->output->colorspace == MODE_RGBA_4444 ||
|
|
p->output->colorspace == MODE_rgbA_4444) {
|
|
p->emit_alpha_row = ExportAlphaRGBA4444;
|
|
} else {
|
|
p->emit_alpha_row = ExportAlpha;
|
|
}
|
|
WebPInitAlphaProcessing();
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Default custom functions
|
|
|
|
static int CustomSetup(VP8Io* io) {
|
|
WebPDecParams* const p = (WebPDecParams*)io->opaque;
|
|
const WEBP_CSP_MODE colorspace = p->output->colorspace;
|
|
const int is_rgb = WebPIsRGBMode(colorspace);
|
|
const int is_alpha = WebPIsAlphaMode(colorspace);
|
|
|
|
p->memory = NULL;
|
|
p->emit = NULL;
|
|
p->emit_alpha = NULL;
|
|
p->emit_alpha_row = NULL;
|
|
if (!WebPIoInitFromOptions(p->options, io, is_alpha ? MODE_YUV : MODE_YUVA)) {
|
|
return 0;
|
|
}
|
|
if (is_alpha && WebPIsPremultipliedMode(colorspace)) {
|
|
WebPInitUpsamplers();
|
|
}
|
|
if (io->use_scaling) {
|
|
const int ok = is_rgb ? InitRGBRescaler(io, p) : InitYUVRescaler(io, p);
|
|
if (!ok) {
|
|
return 0; // memory error
|
|
}
|
|
} else {
|
|
if (is_rgb) {
|
|
p->emit = EmitSampledRGB; // default
|
|
if (io->fancy_upsampling) {
|
|
#ifdef FANCY_UPSAMPLING
|
|
const int uv_width = (io->mb_w + 1) >> 1;
|
|
p->memory = WebPSafeMalloc(1ULL, (size_t)(io->mb_w + 2 * uv_width));
|
|
if (p->memory == NULL) {
|
|
return 0; // memory error.
|
|
}
|
|
p->tmp_y = (uint8_t*)p->memory;
|
|
p->tmp_u = p->tmp_y + io->mb_w;
|
|
p->tmp_v = p->tmp_u + uv_width;
|
|
p->emit = EmitFancyRGB;
|
|
WebPInitUpsamplers();
|
|
#endif
|
|
} else {
|
|
WebPInitSamplers();
|
|
}
|
|
} else {
|
|
p->emit = EmitYUV;
|
|
}
|
|
if (is_alpha) { // need transparency output
|
|
p->emit_alpha =
|
|
(colorspace == MODE_RGBA_4444 || colorspace == MODE_rgbA_4444) ?
|
|
EmitAlphaRGBA4444
|
|
: is_rgb ? EmitAlphaRGB
|
|
: EmitAlphaYUV;
|
|
if (is_rgb) {
|
|
WebPInitAlphaProcessing();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (is_rgb) {
|
|
VP8YUVInit();
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
static int CustomPut(const VP8Io* io) {
|
|
WebPDecParams* const p = (WebPDecParams*)io->opaque;
|
|
const int mb_w = io->mb_w;
|
|
const int mb_h = io->mb_h;
|
|
int num_lines_out;
|
|
assert(!(io->mb_y & 1));
|
|
|
|
if (mb_w <= 0 || mb_h <= 0) {
|
|
return 0;
|
|
}
|
|
num_lines_out = p->emit(io, p);
|
|
if (p->emit_alpha != NULL) {
|
|
p->emit_alpha(io, p);
|
|
}
|
|
p->last_y += num_lines_out;
|
|
return 1;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
static void CustomTeardown(const VP8Io* io) {
|
|
WebPDecParams* const p = (WebPDecParams*)io->opaque;
|
|
WebPSafeFree(p->memory);
|
|
p->memory = NULL;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Main entry point
|
|
|
|
void WebPInitCustomIo(WebPDecParams* const params, VP8Io* const io) {
|
|
io->put = CustomPut;
|
|
io->setup = CustomSetup;
|
|
io->teardown = CustomTeardown;
|
|
io->opaque = params;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|