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Diffstat (limited to 'thirdparty/libwebp/dec/io_dec.c')
| -rw-r--r-- | thirdparty/libwebp/dec/io_dec.c | 645 |
1 files changed, 0 insertions, 645 deletions
diff --git a/thirdparty/libwebp/dec/io_dec.c b/thirdparty/libwebp/dec/io_dec.c deleted file mode 100644 index 8bfab86959..0000000000 --- a/thirdparty/libwebp/dec/io_dec.c +++ /dev/null @@ -1,645 +0,0 @@ -// Copyright 2011 Google Inc. All Rights Reserved. -// -// Use of this source code is governed by a BSD-style license -// that can be found in the COPYING file in the root of the source -// tree. An additional intellectual property rights grant can be found -// in the file PATENTS. All contributing project authors may -// be found in the AUTHORS file in the root of the source tree. -// ----------------------------------------------------------------------------- -// -// functions for sample output. -// -// Author: Skal (pascal.massimino@gmail.com) - -#include <assert.h> -#include <stdlib.h> -#include "../dec/vp8i_dec.h" -#include "./webpi_dec.h" -#include "../dsp/dsp.h" -#include "../dsp/yuv.h" -#include "../utils/utils.h" - -//------------------------------------------------------------------------------ -// Main YUV<->RGB conversion functions - -static int EmitYUV(const VP8Io* const io, WebPDecParams* const p) { - WebPDecBuffer* output = p->output; - const WebPYUVABuffer* const buf = &output->u.YUVA; - uint8_t* const y_dst = buf->y + io->mb_y * buf->y_stride; - uint8_t* const u_dst = buf->u + (io->mb_y >> 1) * buf->u_stride; - uint8_t* const v_dst = buf->v + (io->mb_y >> 1) * buf->v_stride; - const int mb_w = io->mb_w; - const int mb_h = io->mb_h; - const int uv_w = (mb_w + 1) / 2; - const int uv_h = (mb_h + 1) / 2; - int j; - for (j = 0; j < mb_h; ++j) { - memcpy(y_dst + j * buf->y_stride, io->y + j * io->y_stride, mb_w); - } - for (j = 0; j < uv_h; ++j) { - memcpy(u_dst + j * buf->u_stride, io->u + j * io->uv_stride, uv_w); - memcpy(v_dst + j * buf->v_stride, io->v + j * io->uv_stride, uv_w); - } - return io->mb_h; -} - -// Point-sampling U/V sampler. -static int EmitSampledRGB(const VP8Io* const io, WebPDecParams* const p) { - WebPDecBuffer* const output = p->output; - WebPRGBABuffer* const buf = &output->u.RGBA; - uint8_t* const dst = buf->rgba + io->mb_y * buf->stride; - WebPSamplerProcessPlane(io->y, io->y_stride, - io->u, io->v, io->uv_stride, - dst, buf->stride, io->mb_w, io->mb_h, - WebPSamplers[output->colorspace]); - return io->mb_h; -} - -//------------------------------------------------------------------------------ -// Fancy upsampling - -#ifdef FANCY_UPSAMPLING -static int EmitFancyRGB(const VP8Io* const io, WebPDecParams* const p) { - int num_lines_out = io->mb_h; // a priori guess - const WebPRGBABuffer* const buf = &p->output->u.RGBA; - uint8_t* dst = buf->rgba + io->mb_y * buf->stride; - WebPUpsampleLinePairFunc upsample = WebPUpsamplers[p->output->colorspace]; - const uint8_t* cur_y = io->y; - const uint8_t* cur_u = io->u; - const uint8_t* cur_v = io->v; - const uint8_t* top_u = p->tmp_u; - const uint8_t* top_v = p->tmp_v; - int y = io->mb_y; - const int y_end = io->mb_y + io->mb_h; - const int mb_w = io->mb_w; - const int uv_w = (mb_w + 1) / 2; - - if (y == 0) { - // First line is special cased. We mirror the u/v samples at boundary. - upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v, dst, NULL, mb_w); - } else { - // We can finish the left-over line from previous call. - upsample(p->tmp_y, cur_y, top_u, top_v, cur_u, cur_v, - dst - buf->stride, dst, mb_w); - ++num_lines_out; - } - // Loop over each output pairs of row. - for (; y + 2 < y_end; y += 2) { - top_u = cur_u; - top_v = cur_v; - cur_u += io->uv_stride; - cur_v += io->uv_stride; - dst += 2 * buf->stride; - cur_y += 2 * io->y_stride; - upsample(cur_y - io->y_stride, cur_y, - top_u, top_v, cur_u, cur_v, - dst - buf->stride, dst, mb_w); - } - // move to last row - cur_y += io->y_stride; - if (io->crop_top + y_end < io->crop_bottom) { - // Save the unfinished samples for next call (as we're not done yet). - memcpy(p->tmp_y, cur_y, mb_w * sizeof(*p->tmp_y)); - memcpy(p->tmp_u, cur_u, uv_w * sizeof(*p->tmp_u)); - memcpy(p->tmp_v, cur_v, uv_w * sizeof(*p->tmp_v)); - // The fancy upsampler leaves a row unfinished behind - // (except for the very last row) - num_lines_out--; - } else { - // Process the very last row of even-sized picture - if (!(y_end & 1)) { - upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v, - dst + buf->stride, NULL, mb_w); - } - } - return num_lines_out; -} - -#endif /* FANCY_UPSAMPLING */ - -//------------------------------------------------------------------------------ - -static void FillAlphaPlane(uint8_t* dst, int w, int h, int stride) { - int j; - for (j = 0; j < h; ++j) { - memset(dst, 0xff, w * sizeof(*dst)); - dst += stride; - } -} - -static int EmitAlphaYUV(const VP8Io* const io, WebPDecParams* const p, - int expected_num_lines_out) { - const uint8_t* alpha = io->a; - const WebPYUVABuffer* const buf = &p->output->u.YUVA; - const int mb_w = io->mb_w; - const int mb_h = io->mb_h; - uint8_t* dst = buf->a + io->mb_y * buf->a_stride; - int j; - (void)expected_num_lines_out; - assert(expected_num_lines_out == mb_h); - if (alpha != NULL) { - for (j = 0; j < mb_h; ++j) { - memcpy(dst, alpha, mb_w * sizeof(*dst)); - alpha += io->width; - dst += buf->a_stride; - } - } else if (buf->a != NULL) { - // the user requested alpha, but there is none, set it to opaque. - FillAlphaPlane(dst, mb_w, mb_h, buf->a_stride); - } - return 0; -} - -static int GetAlphaSourceRow(const VP8Io* const io, - const uint8_t** alpha, int* const num_rows) { - int start_y = io->mb_y; - *num_rows = io->mb_h; - - // Compensate for the 1-line delay of the fancy upscaler. - // This is similar to EmitFancyRGB(). - if (io->fancy_upsampling) { - if (start_y == 0) { - // We don't process the last row yet. It'll be done during the next call. - --*num_rows; - } else { - --start_y; - // Fortunately, *alpha data is persistent, so we can go back - // one row and finish alpha blending, now that the fancy upscaler - // completed the YUV->RGB interpolation. - *alpha -= io->width; - } - if (io->crop_top + io->mb_y + io->mb_h == io->crop_bottom) { - // If it's the very last call, we process all the remaining rows! - *num_rows = io->crop_bottom - io->crop_top - start_y; - } - } - return start_y; -} - -static int EmitAlphaRGB(const VP8Io* const io, WebPDecParams* const p, - int expected_num_lines_out) { - const uint8_t* alpha = io->a; - if (alpha != NULL) { - const int mb_w = io->mb_w; - const WEBP_CSP_MODE colorspace = p->output->colorspace; - const int alpha_first = - (colorspace == MODE_ARGB || colorspace == MODE_Argb); - const WebPRGBABuffer* const buf = &p->output->u.RGBA; - int num_rows; - const int start_y = GetAlphaSourceRow(io, &alpha, &num_rows); - uint8_t* const base_rgba = buf->rgba + start_y * buf->stride; - uint8_t* const dst = base_rgba + (alpha_first ? 0 : 3); - const int has_alpha = WebPDispatchAlpha(alpha, io->width, mb_w, - num_rows, dst, buf->stride); - (void)expected_num_lines_out; - assert(expected_num_lines_out == num_rows); - // has_alpha is true if there's non-trivial alpha to premultiply with. - if (has_alpha && WebPIsPremultipliedMode(colorspace)) { - WebPApplyAlphaMultiply(base_rgba, alpha_first, - mb_w, num_rows, buf->stride); - } - } - return 0; -} - -static int EmitAlphaRGBA4444(const VP8Io* const io, WebPDecParams* const p, - int expected_num_lines_out) { - const uint8_t* alpha = io->a; - if (alpha != NULL) { - const int mb_w = io->mb_w; - const WEBP_CSP_MODE colorspace = p->output->colorspace; - const WebPRGBABuffer* const buf = &p->output->u.RGBA; - int num_rows; - const int start_y = GetAlphaSourceRow(io, &alpha, &num_rows); - uint8_t* const base_rgba = buf->rgba + start_y * buf->stride; -#ifdef WEBP_SWAP_16BIT_CSP - uint8_t* alpha_dst = base_rgba; -#else - uint8_t* alpha_dst = base_rgba + 1; -#endif - uint32_t alpha_mask = 0x0f; - int i, j; - for (j = 0; j < num_rows; ++j) { - for (i = 0; i < mb_w; ++i) { - // Fill in the alpha value (converted to 4 bits). - const uint32_t alpha_value = alpha[i] >> 4; - alpha_dst[2 * i] = (alpha_dst[2 * i] & 0xf0) | alpha_value; - alpha_mask &= alpha_value; - } - alpha += io->width; - alpha_dst += buf->stride; - } - (void)expected_num_lines_out; - assert(expected_num_lines_out == num_rows); - if (alpha_mask != 0x0f && WebPIsPremultipliedMode(colorspace)) { - WebPApplyAlphaMultiply4444(base_rgba, mb_w, num_rows, buf->stride); - } - } - return 0; -} - -//------------------------------------------------------------------------------ -// YUV rescaling (no final RGB conversion needed) - -static int Rescale(const uint8_t* src, int src_stride, - int new_lines, WebPRescaler* const wrk) { - int num_lines_out = 0; - while (new_lines > 0) { // import new contributions of source rows. - const int lines_in = WebPRescalerImport(wrk, new_lines, src, src_stride); - src += lines_in * src_stride; - new_lines -= lines_in; - num_lines_out += WebPRescalerExport(wrk); // emit output row(s) - } - return num_lines_out; -} - -static int EmitRescaledYUV(const VP8Io* const io, WebPDecParams* const p) { - const int mb_h = io->mb_h; - const int uv_mb_h = (mb_h + 1) >> 1; - WebPRescaler* const scaler = p->scaler_y; - int num_lines_out = 0; - if (WebPIsAlphaMode(p->output->colorspace) && io->a != NULL) { - // Before rescaling, we premultiply the luma directly into the io->y - // internal buffer. This is OK since these samples are not used for - // intra-prediction (the top samples are saved in cache_y_/u_/v_). - // But we need to cast the const away, though. - WebPMultRows((uint8_t*)io->y, io->y_stride, - io->a, io->width, io->mb_w, mb_h, 0); - } - num_lines_out = Rescale(io->y, io->y_stride, mb_h, scaler); - Rescale(io->u, io->uv_stride, uv_mb_h, p->scaler_u); - Rescale(io->v, io->uv_stride, uv_mb_h, p->scaler_v); - return num_lines_out; -} - -static int EmitRescaledAlphaYUV(const VP8Io* const io, WebPDecParams* const p, - int expected_num_lines_out) { - const WebPYUVABuffer* const buf = &p->output->u.YUVA; - uint8_t* const dst_a = buf->a + p->last_y * buf->a_stride; - if (io->a != NULL) { - uint8_t* const dst_y = buf->y + p->last_y * buf->y_stride; - const int num_lines_out = Rescale(io->a, io->width, io->mb_h, p->scaler_a); - assert(expected_num_lines_out == num_lines_out); - if (num_lines_out > 0) { // unmultiply the Y - WebPMultRows(dst_y, buf->y_stride, dst_a, buf->a_stride, - p->scaler_a->dst_width, num_lines_out, 1); - } - } else if (buf->a != NULL) { - // the user requested alpha, but there is none, set it to opaque. - assert(p->last_y + expected_num_lines_out <= io->scaled_height); - FillAlphaPlane(dst_a, io->scaled_width, expected_num_lines_out, - buf->a_stride); - } - return 0; -} - -static int InitYUVRescaler(const VP8Io* const io, WebPDecParams* const p) { - const int has_alpha = WebPIsAlphaMode(p->output->colorspace); - const WebPYUVABuffer* const buf = &p->output->u.YUVA; - const int out_width = io->scaled_width; - const int out_height = io->scaled_height; - const int uv_out_width = (out_width + 1) >> 1; - const int uv_out_height = (out_height + 1) >> 1; - 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 luma rescaler - const size_t uv_work_size = 2 * uv_out_width; // and for each u/v ones - size_t tmp_size, rescaler_size; - rescaler_t* work; - WebPRescaler* scalers; - const int num_rescalers = has_alpha ? 4 : 3; - - tmp_size = (work_size + 2 * uv_work_size) * sizeof(*work); - if (has_alpha) { - tmp_size += work_size * sizeof(*work); - } - rescaler_size = num_rescalers * sizeof(*p->scaler_y) + WEBP_ALIGN_CST; - - p->memory = WebPSafeMalloc(1ULL, tmp_size + rescaler_size); - if (p->memory == NULL) { - return 0; // memory error - } - work = (rescaler_t*)p->memory; - - scalers = (WebPRescaler*)WEBP_ALIGN((const uint8_t*)work + tmp_size); - p->scaler_y = &scalers[0]; - p->scaler_u = &scalers[1]; - p->scaler_v = &scalers[2]; - p->scaler_a = has_alpha ? &scalers[3] : NULL; - - WebPRescalerInit(p->scaler_y, io->mb_w, io->mb_h, - buf->y, out_width, out_height, buf->y_stride, 1, - work); - WebPRescalerInit(p->scaler_u, uv_in_width, uv_in_height, - buf->u, uv_out_width, uv_out_height, buf->u_stride, 1, - work + work_size); - WebPRescalerInit(p->scaler_v, uv_in_width, uv_in_height, - buf->v, uv_out_width, uv_out_height, buf->v_stride, 1, - work + work_size + uv_work_size); - p->emit = EmitRescaledYUV; - - if (has_alpha) { - WebPRescalerInit(p->scaler_a, io->mb_w, io->mb_h, - buf->a, out_width, out_height, buf->a_stride, 1, - work + work_size + 2 * uv_work_size); - p->emit_alpha = EmitRescaledAlphaYUV; - WebPInitAlphaProcessing(); - } - return 1; -} - -//------------------------------------------------------------------------------ -// RGBA rescaling - -static int ExportRGB(WebPDecParams* const p, int y_pos) { - const WebPYUV444Converter convert = - WebPYUV444Converters[p->output->colorspace]; - const WebPRGBABuffer* const buf = &p->output->u.RGBA; - uint8_t* dst = buf->rgba + y_pos * buf->stride; - int num_lines_out = 0; - // For RGB rescaling, because of the YUV420, current scan position - // U/V can be +1/-1 line from the Y one. Hence the double test. - while (WebPRescalerHasPendingOutput(p->scaler_y) && - WebPRescalerHasPendingOutput(p->scaler_u)) { - assert(y_pos + num_lines_out < p->output->height); - assert(p->scaler_u->y_accum == p->scaler_v->y_accum); - WebPRescalerExportRow(p->scaler_y); - WebPRescalerExportRow(p->scaler_u); - WebPRescalerExportRow(p->scaler_v); - convert(p->scaler_y->dst, p->scaler_u->dst, p->scaler_v->dst, - dst, p->scaler_y->dst_width); - dst += buf->stride; - ++num_lines_out; - } - return num_lines_out; -} - -static int EmitRescaledRGB(const VP8Io* const io, WebPDecParams* const p) { - const int mb_h = io->mb_h; - const int uv_mb_h = (mb_h + 1) >> 1; - int j = 0, uv_j = 0; - int num_lines_out = 0; - while (j < mb_h) { - const int y_lines_in = - WebPRescalerImport(p->scaler_y, mb_h - j, - io->y + j * io->y_stride, io->y_stride); - j += y_lines_in; - if (WebPRescaleNeededLines(p->scaler_u, uv_mb_h - uv_j)) { - const int u_lines_in = - WebPRescalerImport(p->scaler_u, uv_mb_h - uv_j, - io->u + uv_j * io->uv_stride, io->uv_stride); - const int v_lines_in = - WebPRescalerImport(p->scaler_v, uv_mb_h - uv_j, - io->v + uv_j * io->uv_stride, io->uv_stride); - (void)v_lines_in; // remove a gcc warning - assert(u_lines_in == v_lines_in); - uv_j += u_lines_in; - } - num_lines_out += ExportRGB(p, p->last_y + num_lines_out); - } - return num_lines_out; -} - -static int ExportAlpha(WebPDecParams* const p, int y_pos, int max_lines_out) { - const WebPRGBABuffer* const buf = &p->output->u.RGBA; - uint8_t* const base_rgba = buf->rgba + 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 non_opaque = 0; - const int width = p->scaler_a->dst_width; - - while (WebPRescalerHasPendingOutput(p->scaler_a) && - num_lines_out < max_lines_out) { - assert(y_pos + num_lines_out < p->output->height); - WebPRescalerExportRow(p->scaler_a); - non_opaque |= WebPDispatchAlpha(p->scaler_a->dst, 0, width, 1, dst, 0); - dst += buf->stride; - ++num_lines_out; - } - if (is_premult_alpha && non_opaque) { - WebPApplyAlphaMultiply(base_rgba, alpha_first, - width, num_lines_out, buf->stride); - } - return num_lines_out; -} - -static int ExportAlphaRGBA4444(WebPDecParams* const p, int y_pos, - int max_lines_out) { - const WebPRGBABuffer* const buf = &p->output->u.RGBA; - uint8_t* const base_rgba = buf->rgba + 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) && - num_lines_out < max_lines_out) { - int i; - assert(y_pos + num_lines_out < p->output->height); - WebPRescalerExportRow(p->scaler_a); - 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, - int expected_num_out_lines) { - if (io->a != NULL) { - WebPRescaler* const scaler = p->scaler_a; - int lines_left = expected_num_out_lines; - const int y_end = p->last_y + lines_left; - while (lines_left > 0) { - const int row_offset = scaler->src_y - io->mb_y; - WebPRescalerImport(scaler, io->mb_h + io->mb_y - scaler->src_y, - io->a + row_offset * io->width, io->width); - lines_left -= p->emit_alpha_row(p, y_end - lines_left, lines_left); - } - } - 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 - rescaler_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, rescaler_size; - WebPRescaler* scalers; - const int num_rescalers = has_alpha ? 4 : 3; - - 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); - rescaler_size = num_rescalers * sizeof(*p->scaler_y) + WEBP_ALIGN_CST; - - p->memory = WebPSafeMalloc(1ULL, total_size + rescaler_size); - if (p->memory == NULL) { - return 0; // memory error - } - work = (rescaler_t*)p->memory; - tmp = (uint8_t*)(work + tmp_size1); - - scalers = (WebPRescaler*)WEBP_ALIGN((const uint8_t*)work + total_size); - p->scaler_y = &scalers[0]; - p->scaler_u = &scalers[1]; - p->scaler_v = &scalers[2]; - p->scaler_a = has_alpha ? &scalers[3] : NULL; - - WebPRescalerInit(p->scaler_y, io->mb_w, io->mb_h, - tmp + 0 * out_width, out_width, out_height, 0, 1, - work + 0 * work_size); - WebPRescalerInit(p->scaler_u, uv_in_width, uv_in_height, - tmp + 1 * out_width, out_width, out_height, 0, 1, - work + 1 * work_size); - WebPRescalerInit(p->scaler_v, uv_in_width, uv_in_height, - tmp + 2 * out_width, out_width, out_height, 0, 1, - work + 2 * work_size); - p->emit = EmitRescaledRGB; - WebPInitYUV444Converters(); - - if (has_alpha) { - WebPRescalerInit(p->scaler_a, io->mb_w, io->mb_h, - tmp + 3 * out_width, out_width, out_height, 0, 1, - 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) { - WebPInitSamplers(); - 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 { - 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, num_lines_out); - } - 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; -} - -//------------------------------------------------------------------------------ |