| // Copyright 2017 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #include "core/fxge/dib/cstretchengine.h" |
| |
| #include <algorithm> |
| #include <utility> |
| |
| #include "core/fxcrt/pauseindicator_iface.h" |
| #include "core/fxge/dib/cfx_dibitmap.h" |
| #include "core/fxge/dib/cfx_dibsource.h" |
| #include "core/fxge/dib/scanlinecomposer_iface.h" |
| #include "core/fxge/fx_dib.h" |
| |
| namespace { |
| |
| const int kMaxDestValue = 16711680; |
| |
| int GetPitchRoundUpTo4Bytes(int bits_per_pixel) { |
| return (bits_per_pixel + 31) / 32 * 4; |
| } |
| |
| } // namespace |
| |
| CStretchEngine::CWeightTable::CWeightTable() |
| : m_DestMin(0), |
| m_ItemSize(0), |
| m_dwWeightTablesSize(0) {} |
| |
| CStretchEngine::CWeightTable::~CWeightTable() {} |
| |
| size_t CStretchEngine::CWeightTable::GetPixelWeightSize() const { |
| return m_ItemSize / sizeof(int) - 2; |
| } |
| |
| bool CStretchEngine::CWeightTable::Calc(int dest_len, |
| int dest_min, |
| int dest_max, |
| int src_len, |
| int src_min, |
| int src_max, |
| int flags) { |
| m_WeightTables.clear(); |
| m_dwWeightTablesSize = 0; |
| const double scale = static_cast<float>(src_len) / dest_len; |
| const double base = dest_len < 0 ? src_len : 0; |
| const int ext_size = flags & FXDIB_BICUBIC_INTERPOL ? 3 : 1; |
| m_ItemSize = |
| sizeof(int) * 2 + |
| static_cast<int>(sizeof(int) * |
| (ceil(fabs(static_cast<float>(scale))) + ext_size)); |
| |
| m_DestMin = dest_min; |
| if (dest_max - dest_min > static_cast<int>((1U << 30) - 4) / m_ItemSize) |
| return false; |
| |
| m_dwWeightTablesSize = (dest_max - dest_min) * m_ItemSize + 4; |
| m_WeightTables.resize(m_dwWeightTablesSize); |
| if ((flags & FXDIB_NOSMOOTH) != 0 || fabs(static_cast<float>(scale)) < 1.0f) { |
| for (int dest_pixel = dest_min; dest_pixel < dest_max; ++dest_pixel) { |
| PixelWeight& pixel_weights = *GetPixelWeight(dest_pixel); |
| double src_pos = dest_pixel * scale + scale / 2 + base; |
| if (flags & FXDIB_INTERPOL) { |
| pixel_weights.m_SrcStart = |
| static_cast<int>(floor(static_cast<float>(src_pos) - 1.0f / 2)); |
| pixel_weights.m_SrcEnd = |
| static_cast<int>(floor(static_cast<float>(src_pos) + 1.0f / 2)); |
| pixel_weights.m_SrcStart = std::max(pixel_weights.m_SrcStart, src_min); |
| pixel_weights.m_SrcEnd = std::min(pixel_weights.m_SrcEnd, src_max - 1); |
| if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) { |
| pixel_weights.m_Weights[0] = 65536; |
| } else { |
| pixel_weights.m_Weights[1] = |
| FXSYS_round(static_cast<float>( |
| src_pos - pixel_weights.m_SrcStart - 1.0f / 2) * |
| 65536); |
| pixel_weights.m_Weights[0] = 65536 - pixel_weights.m_Weights[1]; |
| } |
| } else if (flags & FXDIB_BICUBIC_INTERPOL) { |
| pixel_weights.m_SrcStart = |
| static_cast<int>(floor(static_cast<float>(src_pos) - 1.0f / 2)); |
| pixel_weights.m_SrcEnd = |
| static_cast<int>(floor(static_cast<float>(src_pos) + 1.0f / 2)); |
| int start = pixel_weights.m_SrcStart - 1; |
| int end = pixel_weights.m_SrcEnd + 1; |
| start = std::max(start, src_min); |
| end = std::min(end, src_max - 1); |
| if (pixel_weights.m_SrcStart < src_min) { |
| src_pos += src_min - pixel_weights.m_SrcStart; |
| pixel_weights.m_SrcStart = src_min; |
| } |
| pixel_weights.m_SrcEnd = std::min(pixel_weights.m_SrcEnd, src_max - 1); |
| int weight = FXSYS_round( |
| static_cast<float>(src_pos - pixel_weights.m_SrcStart - 1.0f / 2) * |
| 256); |
| if (start == end) { |
| pixel_weights.m_Weights[0] = |
| (SDP_Table[256 + weight] + SDP_Table[weight] + |
| SDP_Table[256 - weight] + SDP_Table[512 - weight]) |
| << 8; |
| } else if ((start == pixel_weights.m_SrcStart && |
| (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd || |
| end == pixel_weights.m_SrcEnd) && |
| start < end) || |
| (start < pixel_weights.m_SrcStart && |
| pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd && |
| end == pixel_weights.m_SrcEnd)) { |
| if (start < pixel_weights.m_SrcStart) { |
| pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8; |
| pixel_weights.m_Weights[1] = |
| (SDP_Table[weight] + SDP_Table[256 - weight] + |
| SDP_Table[512 - weight]) |
| << 8; |
| } else { |
| if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) { |
| pixel_weights.m_Weights[0] = |
| (SDP_Table[256 + weight] + SDP_Table[weight] + |
| SDP_Table[256 - weight]) |
| << 8; |
| pixel_weights.m_Weights[1] = SDP_Table[512 - weight] << 8; |
| } else { |
| pixel_weights.m_Weights[0] = |
| (SDP_Table[256 + weight] + SDP_Table[weight]) << 8; |
| pixel_weights.m_Weights[1] = |
| (SDP_Table[256 - weight] + SDP_Table[512 - weight]) << 8; |
| } |
| } |
| if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) { |
| pixel_weights.m_SrcEnd = end; |
| } |
| if (start < pixel_weights.m_SrcStart) { |
| pixel_weights.m_SrcStart = start; |
| } |
| } else if (start == pixel_weights.m_SrcStart && |
| start < pixel_weights.m_SrcEnd && |
| pixel_weights.m_SrcEnd < end) { |
| pixel_weights.m_Weights[0] = |
| (SDP_Table[256 + weight] + SDP_Table[weight]) << 8; |
| pixel_weights.m_Weights[1] = SDP_Table[256 - weight] << 8; |
| pixel_weights.m_Weights[2] = SDP_Table[512 - weight] << 8; |
| pixel_weights.m_SrcEnd = end; |
| } else if (start < pixel_weights.m_SrcStart && |
| pixel_weights.m_SrcStart < pixel_weights.m_SrcEnd && |
| pixel_weights.m_SrcEnd == end) { |
| pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8; |
| pixel_weights.m_Weights[1] = SDP_Table[weight] << 8; |
| pixel_weights.m_Weights[2] = |
| (SDP_Table[256 - weight] + SDP_Table[512 - weight]) << 8; |
| pixel_weights.m_SrcStart = start; |
| } else { |
| pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8; |
| pixel_weights.m_Weights[1] = SDP_Table[weight] << 8; |
| pixel_weights.m_Weights[2] = SDP_Table[256 - weight] << 8; |
| pixel_weights.m_Weights[3] = SDP_Table[512 - weight] << 8; |
| pixel_weights.m_SrcStart = start; |
| pixel_weights.m_SrcEnd = end; |
| } |
| } else { |
| int pixel_pos = static_cast<int>(floor(static_cast<float>(src_pos))); |
| pixel_weights.m_SrcStart = std::max(pixel_pos, src_min); |
| pixel_weights.m_SrcEnd = std::min(pixel_pos, src_max - 1); |
| pixel_weights.m_Weights[0] = 65536; |
| } |
| } |
| return true; |
| } |
| |
| for (int dest_pixel = dest_min; dest_pixel < dest_max; ++dest_pixel) { |
| PixelWeight& pixel_weights = *GetPixelWeight(dest_pixel); |
| double src_start = dest_pixel * scale + base; |
| double src_end = src_start + scale; |
| int start_i = floor(std::min(src_start, src_end)); |
| int end_i = floor(std::max(src_start, src_end)); |
| start_i = std::max(start_i, src_min); |
| end_i = std::min(end_i, src_max - 1); |
| if (start_i > end_i) { |
| start_i = std::min(start_i, src_max - 1); |
| pixel_weights.m_SrcStart = start_i; |
| pixel_weights.m_SrcEnd = start_i; |
| continue; |
| } |
| pixel_weights.m_SrcStart = start_i; |
| pixel_weights.m_SrcEnd = end_i; |
| for (int j = start_i; j <= end_i; ++j) { |
| double dest_start = (j - base) / scale; |
| double dest_end = (j + 1 - base) / scale; |
| if (dest_start > dest_end) |
| std::swap(dest_start, dest_end); |
| double area_start = std::max(dest_start, static_cast<double>(dest_pixel)); |
| double area_end = std::min(dest_end, static_cast<double>(dest_pixel + 1)); |
| double weight = std::max(0.0, area_end - area_start); |
| if (weight == 0 && j == end_i) { |
| --pixel_weights.m_SrcEnd; |
| break; |
| } |
| size_t idx = j - start_i; |
| if (idx >= GetPixelWeightSize()) |
| return false; |
| |
| pixel_weights.m_Weights[idx] = FXSYS_round(weight * 65536); |
| } |
| } |
| return true; |
| } |
| |
| PixelWeight* CStretchEngine::CWeightTable::GetPixelWeight(int pixel) const { |
| ASSERT(pixel >= m_DestMin); |
| return reinterpret_cast<PixelWeight*>(const_cast<uint8_t*>( |
| m_WeightTables.data() + (pixel - m_DestMin) * m_ItemSize)); |
| } |
| |
| int* CStretchEngine::CWeightTable::GetValueFromPixelWeight(PixelWeight* pWeight, |
| int index) const { |
| if (index < pWeight->m_SrcStart) |
| return nullptr; |
| |
| size_t idx = index - pWeight->m_SrcStart; |
| return idx < GetPixelWeightSize() ? &pWeight->m_Weights[idx] : nullptr; |
| } |
| |
| CStretchEngine::CStretchEngine(ScanlineComposerIface* pDestBitmap, |
| FXDIB_Format dest_format, |
| int dest_width, |
| int dest_height, |
| const FX_RECT& clip_rect, |
| const RetainPtr<CFX_DIBSource>& pSrcBitmap, |
| int flags) |
| : m_DestFormat(dest_format), |
| m_DestBpp(GetBppFromFormat(dest_format)), |
| m_SrcBpp(GetBppFromFormat(pSrcBitmap->GetFormat())), |
| m_bHasAlpha(pSrcBitmap->GetFormat() & 0x200), |
| m_pSource(pSrcBitmap), |
| m_pSrcPalette(pSrcBitmap->GetPalette()), |
| m_SrcWidth(pSrcBitmap->GetWidth()), |
| m_SrcHeight(pSrcBitmap->GetHeight()), |
| m_pDestBitmap(pDestBitmap), |
| m_DestWidth(dest_width), |
| m_DestHeight(dest_height), |
| m_DestClip(clip_rect) { |
| uint32_t size = clip_rect.Width(); |
| if (size && m_DestBpp > static_cast<int>(INT_MAX / size)) |
| return; |
| |
| size *= m_DestBpp; |
| if (size > INT_MAX - 31) |
| return; |
| |
| size = GetPitchRoundUpTo4Bytes(size); |
| m_DestScanline.resize(size); |
| if (dest_format == FXDIB_Rgb32) |
| std::fill(m_DestScanline.begin(), m_DestScanline.end(), 255); |
| m_InterPitch = GetPitchRoundUpTo4Bytes(m_DestClip.Width() * m_DestBpp); |
| m_ExtraMaskPitch = GetPitchRoundUpTo4Bytes(m_DestClip.Width() * 8); |
| if ((flags & FXDIB_NOSMOOTH) == 0) { |
| bool bInterpol = flags & FXDIB_INTERPOL || flags & FXDIB_BICUBIC_INTERPOL; |
| if (!bInterpol && abs(dest_width) != 0 && |
| abs(dest_height) / 8 < static_cast<long long>(m_SrcWidth) * |
| m_SrcHeight / abs(dest_width)) { |
| flags = FXDIB_INTERPOL; |
| } |
| m_Flags = flags; |
| } else { |
| m_Flags = FXDIB_NOSMOOTH; |
| if (flags & FXDIB_DOWNSAMPLE) |
| m_Flags |= FXDIB_DOWNSAMPLE; |
| } |
| double scale_x = static_cast<float>(m_SrcWidth) / m_DestWidth; |
| double scale_y = static_cast<float>(m_SrcHeight) / m_DestHeight; |
| double base_x = m_DestWidth > 0 ? 0.0f : m_DestWidth; |
| double base_y = m_DestHeight > 0 ? 0.0f : m_DestHeight; |
| double src_left = scale_x * (clip_rect.left + base_x); |
| double src_right = scale_x * (clip_rect.right + base_x); |
| double src_top = scale_y * (clip_rect.top + base_y); |
| double src_bottom = scale_y * (clip_rect.bottom + base_y); |
| if (src_left > src_right) |
| std::swap(src_left, src_right); |
| if (src_top > src_bottom) |
| std::swap(src_top, src_bottom); |
| m_SrcClip.left = static_cast<int>(floor(src_left)); |
| m_SrcClip.right = static_cast<int>(ceil(src_right)); |
| m_SrcClip.top = static_cast<int>(floor(src_top)); |
| m_SrcClip.bottom = static_cast<int>(ceil(src_bottom)); |
| FX_RECT src_rect(0, 0, m_SrcWidth, m_SrcHeight); |
| m_SrcClip.Intersect(src_rect); |
| |
| switch (m_SrcBpp) { |
| case 1: |
| m_TransMethod = m_DestBpp == 8 ? TransformMethod::k1BppTo8Bpp |
| : TransformMethod::k1BppToManyBpp; |
| break; |
| case 8: |
| if (m_DestBpp == 8) { |
| m_TransMethod = m_bHasAlpha ? TransformMethod::k8BppTo8BppWithAlpha |
| : TransformMethod::k8BppTo8Bpp; |
| } else { |
| m_TransMethod = m_bHasAlpha ? TransformMethod::k8BppToManyBppWithAlpha |
| : TransformMethod::k8BppToManyBpp; |
| } |
| break; |
| default: |
| m_TransMethod = m_bHasAlpha ? TransformMethod::kManyBpptoManyBppWithAlpha |
| : TransformMethod::kManyBpptoManyBpp; |
| break; |
| } |
| } |
| |
| CStretchEngine::~CStretchEngine() {} |
| |
| bool CStretchEngine::Continue(PauseIndicatorIface* pPause) { |
| while (m_State == State::kHorizontal) { |
| if (ContinueStretchHorz(pPause)) |
| return true; |
| |
| m_State = State::kVertical; |
| StretchVert(); |
| } |
| return false; |
| } |
| |
| bool CStretchEngine::StartStretchHorz() { |
| if (m_DestWidth == 0 || m_InterPitch == 0 || m_DestScanline.empty()) |
| return false; |
| |
| if (m_SrcClip.Height() == 0 || |
| m_SrcClip.Height() > (1 << 29) / m_InterPitch) { |
| return false; |
| } |
| |
| m_InterBuf.resize(m_SrcClip.Height() * m_InterPitch); |
| if (m_pSource && m_bHasAlpha && m_pSource->m_pAlphaMask) { |
| m_ExtraAlphaBuf.resize(m_SrcClip.Height(), m_ExtraMaskPitch); |
| m_DestMaskScanline.resize(m_ExtraMaskPitch); |
| } |
| bool ret = |
| m_WeightTable.Calc(m_DestWidth, m_DestClip.left, m_DestClip.right, |
| m_SrcWidth, m_SrcClip.left, m_SrcClip.right, m_Flags); |
| if (!ret) |
| return false; |
| |
| m_CurRow = m_SrcClip.top; |
| m_State = State::kHorizontal; |
| return true; |
| } |
| |
| bool CStretchEngine::ContinueStretchHorz(PauseIndicatorIface* pPause) { |
| if (!m_DestWidth) |
| return false; |
| if (m_pSource->SkipToScanline(m_CurRow, pPause)) |
| return true; |
| |
| int Bpp = m_DestBpp / 8; |
| static const int kStrechPauseRows = 10; |
| int rows_to_go = kStrechPauseRows; |
| for (; m_CurRow < m_SrcClip.bottom; ++m_CurRow) { |
| if (rows_to_go == 0) { |
| if (pPause && pPause->NeedToPauseNow()) |
| return true; |
| |
| rows_to_go = kStrechPauseRows; |
| } |
| |
| const uint8_t* src_scan = m_pSource->GetScanline(m_CurRow); |
| uint8_t* dest_scan = |
| m_InterBuf.data() + (m_CurRow - m_SrcClip.top) * m_InterPitch; |
| const uint8_t* src_scan_mask = nullptr; |
| uint8_t* dest_scan_mask = nullptr; |
| if (!m_ExtraAlphaBuf.empty()) { |
| src_scan_mask = m_pSource->m_pAlphaMask->GetScanline(m_CurRow); |
| dest_scan_mask = m_ExtraAlphaBuf.data() + |
| (m_CurRow - m_SrcClip.top) * m_ExtraMaskPitch; |
| } |
| // TODO(npm): reduce duplicated code here |
| switch (m_TransMethod) { |
| case TransformMethod::k1BppTo8Bpp: |
| case TransformMethod::k1BppToManyBpp: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col); |
| int dest_a = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return false; |
| |
| int pixel_weight = *pWeight; |
| if (src_scan[j / 8] & (1 << (7 - j % 8))) |
| dest_a += pixel_weight * 255; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) |
| dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue); |
| *dest_scan++ = static_cast<uint8_t>(dest_a >> 16); |
| } |
| break; |
| } |
| case TransformMethod::k8BppTo8Bpp: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col); |
| int dest_a = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return false; |
| |
| int pixel_weight = *pWeight; |
| dest_a += pixel_weight * src_scan[j]; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) |
| dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue); |
| *dest_scan++ = static_cast<uint8_t>(dest_a >> 16); |
| } |
| break; |
| } |
| case TransformMethod::k8BppTo8BppWithAlpha: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col); |
| int dest_a = 0; |
| int dest_r = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return false; |
| |
| int pixel_weight = *pWeight; |
| pixel_weight = pixel_weight * src_scan_mask[j] / 255; |
| dest_r += pixel_weight * src_scan[j]; |
| dest_a += pixel_weight; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_r = pdfium::clamp(dest_r, 0, kMaxDestValue); |
| dest_a = pdfium::clamp(dest_a, 0, 65536); |
| } |
| *dest_scan++ = static_cast<uint8_t>(dest_r >> 16); |
| *dest_scan_mask++ = static_cast<uint8_t>((dest_a * 255) >> 16); |
| } |
| break; |
| } |
| case TransformMethod::k8BppToManyBpp: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col); |
| int dest_r_y = 0; |
| int dest_g_m = 0; |
| int dest_b_c = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return false; |
| |
| int pixel_weight = *pWeight; |
| unsigned long argb_cmyk = m_pSrcPalette[src_scan[j]]; |
| if (m_DestFormat == FXDIB_Rgb) { |
| dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16); |
| dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8); |
| dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk); |
| } else { |
| dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 24); |
| dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16); |
| dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8); |
| } |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue); |
| dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue); |
| dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue); |
| } |
| *dest_scan++ = static_cast<uint8_t>(dest_b_c >> 16); |
| *dest_scan++ = static_cast<uint8_t>(dest_g_m >> 16); |
| *dest_scan++ = static_cast<uint8_t>(dest_r_y >> 16); |
| } |
| break; |
| } |
| case TransformMethod::k8BppToManyBppWithAlpha: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col); |
| int dest_a = 0; |
| int dest_r_y = 0; |
| int dest_g_m = 0; |
| int dest_b_c = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return false; |
| |
| int pixel_weight = *pWeight; |
| pixel_weight = pixel_weight * src_scan_mask[j] / 255; |
| unsigned long argb_cmyk = m_pSrcPalette[src_scan[j]]; |
| if (m_DestFormat == FXDIB_Rgba) { |
| dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16); |
| dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8); |
| dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk); |
| } else { |
| dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 24); |
| dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16); |
| dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8); |
| } |
| dest_a += pixel_weight; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue); |
| dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue); |
| dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue); |
| dest_a = pdfium::clamp(dest_a, 0, 65536); |
| } |
| *dest_scan++ = static_cast<uint8_t>(dest_b_c >> 16); |
| *dest_scan++ = static_cast<uint8_t>(dest_g_m >> 16); |
| *dest_scan++ = static_cast<uint8_t>(dest_r_y >> 16); |
| *dest_scan_mask++ = static_cast<uint8_t>((dest_a * 255) >> 16); |
| } |
| break; |
| } |
| case TransformMethod::kManyBpptoManyBpp: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col); |
| int dest_r_y = 0; |
| int dest_g_m = 0; |
| int dest_b_c = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return false; |
| |
| int pixel_weight = *pWeight; |
| const uint8_t* src_pixel = src_scan + j * Bpp; |
| dest_b_c += pixel_weight * (*src_pixel++); |
| dest_g_m += pixel_weight * (*src_pixel++); |
| dest_r_y += pixel_weight * (*src_pixel); |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue); |
| dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue); |
| dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue); |
| } |
| *dest_scan++ = static_cast<uint8_t>((dest_b_c) >> 16); |
| *dest_scan++ = static_cast<uint8_t>((dest_g_m) >> 16); |
| *dest_scan++ = static_cast<uint8_t>((dest_r_y) >> 16); |
| dest_scan += Bpp - 3; |
| } |
| break; |
| } |
| case TransformMethod::kManyBpptoManyBppWithAlpha: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col); |
| int dest_a = 0; |
| int dest_r_y = 0; |
| int dest_g_m = 0; |
| int dest_b_c = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return false; |
| |
| int pixel_weight = *pWeight; |
| const uint8_t* src_pixel = src_scan + j * Bpp; |
| if (m_DestFormat == FXDIB_Argb) { |
| pixel_weight = pixel_weight * src_pixel[3] / 255; |
| } else { |
| pixel_weight = pixel_weight * src_scan_mask[j] / 255; |
| } |
| dest_b_c += pixel_weight * (*src_pixel++); |
| dest_g_m += pixel_weight * (*src_pixel++); |
| dest_r_y += pixel_weight * (*src_pixel); |
| dest_a += pixel_weight; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue); |
| dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue); |
| dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue); |
| dest_a = pdfium::clamp(dest_a, 0, 65536); |
| } |
| *dest_scan++ = static_cast<uint8_t>((dest_b_c) >> 16); |
| *dest_scan++ = static_cast<uint8_t>((dest_g_m) >> 16); |
| *dest_scan++ = static_cast<uint8_t>((dest_r_y) >> 16); |
| if (m_DestFormat == FXDIB_Argb) |
| *dest_scan = static_cast<uint8_t>((dest_a * 255) >> 16); |
| if (dest_scan_mask) |
| *dest_scan_mask++ = static_cast<uint8_t>((dest_a * 255) >> 16); |
| dest_scan += Bpp - 3; |
| } |
| break; |
| } |
| } |
| rows_to_go--; |
| } |
| return false; |
| } |
| |
| void CStretchEngine::StretchVert() { |
| if (m_DestHeight == 0) |
| return; |
| |
| CWeightTable table; |
| bool ret = table.Calc(m_DestHeight, m_DestClip.top, m_DestClip.bottom, |
| m_SrcHeight, m_SrcClip.top, m_SrcClip.bottom, m_Flags); |
| if (!ret) |
| return; |
| |
| const int DestBpp = m_DestBpp / 8; |
| for (int row = m_DestClip.top; row < m_DestClip.bottom; ++row) { |
| unsigned char* dest_scan = m_DestScanline.data(); |
| unsigned char* dest_scan_mask = m_DestMaskScanline.data(); |
| PixelWeight* pWeights = table.GetPixelWeight(row); |
| switch (m_TransMethod) { |
| case TransformMethod::k1BppTo8Bpp: |
| case TransformMethod::k1BppToManyBpp: |
| case TransformMethod::k8BppTo8Bpp: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| unsigned char* src_scan = |
| m_InterBuf.data() + (col - m_DestClip.left) * DestBpp; |
| int dest_a = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = table.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return; |
| |
| int pixel_weight = *pWeight; |
| dest_a += |
| pixel_weight * src_scan[(j - m_SrcClip.top) * m_InterPitch]; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) |
| dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue); |
| *dest_scan = static_cast<uint8_t>(dest_a >> 16); |
| dest_scan += DestBpp; |
| } |
| break; |
| } |
| case TransformMethod::k8BppTo8BppWithAlpha: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| unsigned char* src_scan = |
| m_InterBuf.data() + (col - m_DestClip.left) * DestBpp; |
| unsigned char* src_scan_mask = |
| m_ExtraAlphaBuf.data() + (col - m_DestClip.left); |
| int dest_a = 0; |
| int dest_k = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = table.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return; |
| |
| int pixel_weight = *pWeight; |
| dest_k += |
| pixel_weight * src_scan[(j - m_SrcClip.top) * m_InterPitch]; |
| dest_a += pixel_weight * |
| src_scan_mask[(j - m_SrcClip.top) * m_ExtraMaskPitch]; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_k = pdfium::clamp(dest_k, 0, kMaxDestValue); |
| dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue); |
| } |
| *dest_scan = static_cast<uint8_t>(dest_k >> 16); |
| dest_scan += DestBpp; |
| *dest_scan_mask++ = static_cast<uint8_t>(dest_a >> 16); |
| } |
| break; |
| } |
| case TransformMethod::k8BppToManyBpp: |
| case TransformMethod::kManyBpptoManyBpp: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| unsigned char* src_scan = |
| m_InterBuf.data() + (col - m_DestClip.left) * DestBpp; |
| int dest_r_y = 0; |
| int dest_g_m = 0; |
| int dest_b_c = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = table.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return; |
| |
| int pixel_weight = *pWeight; |
| const uint8_t* src_pixel = |
| src_scan + (j - m_SrcClip.top) * m_InterPitch; |
| dest_b_c += pixel_weight * (*src_pixel++); |
| dest_g_m += pixel_weight * (*src_pixel++); |
| dest_r_y += pixel_weight * (*src_pixel); |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue); |
| dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue); |
| dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue); |
| } |
| dest_scan[0] = static_cast<uint8_t>((dest_b_c) >> 16); |
| dest_scan[1] = static_cast<uint8_t>((dest_g_m) >> 16); |
| dest_scan[2] = static_cast<uint8_t>((dest_r_y) >> 16); |
| dest_scan += DestBpp; |
| } |
| break; |
| } |
| case TransformMethod::k8BppToManyBppWithAlpha: |
| case TransformMethod::kManyBpptoManyBppWithAlpha: { |
| for (int col = m_DestClip.left; col < m_DestClip.right; ++col) { |
| unsigned char* src_scan = |
| m_InterBuf.data() + (col - m_DestClip.left) * DestBpp; |
| unsigned char* src_scan_mask = nullptr; |
| if (m_DestFormat != FXDIB_Argb) |
| src_scan_mask = m_ExtraAlphaBuf.data() + (col - m_DestClip.left); |
| int dest_a = 0; |
| int dest_r_y = 0; |
| int dest_g_m = 0; |
| int dest_b_c = 0; |
| for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) { |
| int* pWeight = table.GetValueFromPixelWeight(pWeights, j); |
| if (!pWeight) |
| return; |
| |
| int pixel_weight = *pWeight; |
| const uint8_t* src_pixel = |
| src_scan + (j - m_SrcClip.top) * m_InterPitch; |
| int mask_v = 255; |
| if (src_scan_mask) |
| mask_v = src_scan_mask[(j - m_SrcClip.top) * m_ExtraMaskPitch]; |
| dest_b_c += pixel_weight * (*src_pixel++); |
| dest_g_m += pixel_weight * (*src_pixel++); |
| dest_r_y += pixel_weight * (*src_pixel); |
| if (m_DestFormat == FXDIB_Argb) |
| dest_a += pixel_weight * (*(src_pixel + 1)); |
| else |
| dest_a += pixel_weight * mask_v; |
| } |
| if (m_Flags & FXDIB_BICUBIC_INTERPOL) { |
| dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue); |
| dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue); |
| dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue); |
| dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue); |
| } |
| if (dest_a) { |
| int r = static_cast<uint32_t>(dest_r_y) * 255 / dest_a; |
| int g = static_cast<uint32_t>(dest_g_m) * 255 / dest_a; |
| int b = static_cast<uint32_t>(dest_b_c) * 255 / dest_a; |
| dest_scan[0] = pdfium::clamp(b, 0, 255); |
| dest_scan[1] = pdfium::clamp(g, 0, 255); |
| dest_scan[2] = pdfium::clamp(r, 0, 255); |
| } |
| if (m_DestFormat == FXDIB_Argb) |
| dest_scan[3] = static_cast<uint8_t>((dest_a) >> 16); |
| else |
| *dest_scan_mask = static_cast<uint8_t>((dest_a) >> 16); |
| dest_scan += DestBpp; |
| if (dest_scan_mask) |
| dest_scan_mask++; |
| } |
| break; |
| } |
| } |
| m_pDestBitmap->ComposeScanline(row - m_DestClip.top, m_DestScanline.data(), |
| m_DestMaskScanline.data()); |
| } |
| } |
