// Copyright 2016 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fpdfapi/render/cpdf_dibtransferfunc.h"
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#include <vector>
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#include "core/fpdfapi/parser/cpdf_dictionary.h"
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#include "core/fpdfapi/render/cpdf_transferfunc.h"
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CPDF_DIBTransferFunc::CPDF_DIBTransferFunc(
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const RetainPtr<CPDF_TransferFunc>& pTransferFunc)
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: m_pTransferFunc(pTransferFunc) {
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m_RampR = pTransferFunc->GetSamples();
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m_RampG = &pTransferFunc->GetSamples()[256];
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m_RampB = &pTransferFunc->GetSamples()[512];
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}
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CPDF_DIBTransferFunc::~CPDF_DIBTransferFunc() {}
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FXDIB_Format CPDF_DIBTransferFunc::GetDestFormat() {
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if (m_pSrc->IsAlphaMask())
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return FXDIB_8bppMask;
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#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
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return (m_pSrc->HasAlpha()) ? FXDIB_Argb : FXDIB_Rgb32;
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#else
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return (m_pSrc->HasAlpha()) ? FXDIB_Argb : FXDIB_Rgb;
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#endif
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}
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FX_ARGB* CPDF_DIBTransferFunc::GetDestPalette() {
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return nullptr;
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}
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void CPDF_DIBTransferFunc::TranslateScanline(
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const uint8_t* src_buf,
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std::vector<uint8_t>* dest_buf) const {
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bool bSkip = false;
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switch (m_pSrc->GetFormat()) {
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case FXDIB_1bppRgb: {
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int r0 = m_RampR[0];
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int g0 = m_RampG[0];
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int b0 = m_RampB[0];
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int r1 = m_RampR[255];
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int g1 = m_RampG[255];
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int b1 = m_RampB[255];
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int index = 0;
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for (int i = 0; i < m_Width; i++) {
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if (src_buf[i / 8] & (1 << (7 - i % 8))) {
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(*dest_buf)[index++] = b1;
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(*dest_buf)[index++] = g1;
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(*dest_buf)[index++] = r1;
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} else {
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(*dest_buf)[index++] = b0;
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(*dest_buf)[index++] = g0;
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(*dest_buf)[index++] = r0;
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}
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#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
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index++;
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#endif
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}
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break;
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}
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case FXDIB_1bppMask: {
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int m0 = m_RampR[0];
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int m1 = m_RampR[255];
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int index = 0;
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for (int i = 0; i < m_Width; i++) {
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if (src_buf[i / 8] & (1 << (7 - i % 8)))
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(*dest_buf)[index++] = m1;
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else
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(*dest_buf)[index++] = m0;
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}
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break;
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}
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case FXDIB_8bppRgb: {
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FX_ARGB* pPal = m_pSrc->GetPalette();
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int index = 0;
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for (int i = 0; i < m_Width; i++) {
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if (pPal) {
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FX_ARGB src_argb = pPal[*src_buf];
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(*dest_buf)[index++] = m_RampB[FXARGB_R(src_argb)];
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(*dest_buf)[index++] = m_RampG[FXARGB_G(src_argb)];
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(*dest_buf)[index++] = m_RampR[FXARGB_B(src_argb)];
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} else {
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uint32_t src_byte = *src_buf;
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(*dest_buf)[index++] = m_RampB[src_byte];
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(*dest_buf)[index++] = m_RampG[src_byte];
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(*dest_buf)[index++] = m_RampR[src_byte];
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}
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src_buf++;
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#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
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index++;
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#endif
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}
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break;
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}
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case FXDIB_8bppMask: {
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int index = 0;
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for (int i = 0; i < m_Width; i++)
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(*dest_buf)[index++] = m_RampR[*(src_buf++)];
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break;
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}
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case FXDIB_Rgb: {
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int index = 0;
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for (int i = 0; i < m_Width; i++) {
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(*dest_buf)[index++] = m_RampB[*(src_buf++)];
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(*dest_buf)[index++] = m_RampG[*(src_buf++)];
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(*dest_buf)[index++] = m_RampR[*(src_buf++)];
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#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
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index++;
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#endif
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}
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break;
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}
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case FXDIB_Rgb32:
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bSkip = true;
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case FXDIB_Argb: {
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int index = 0;
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for (int i = 0; i < m_Width; i++) {
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(*dest_buf)[index++] = m_RampB[*(src_buf++)];
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(*dest_buf)[index++] = m_RampG[*(src_buf++)];
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(*dest_buf)[index++] = m_RampR[*(src_buf++)];
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if (!bSkip) {
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(*dest_buf)[index++] = *src_buf;
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#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
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} else {
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index++;
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#endif
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}
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src_buf++;
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}
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break;
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}
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default:
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break;
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}
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}
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void CPDF_DIBTransferFunc::TranslateDownSamples(uint8_t* dest_buf,
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const uint8_t* src_buf,
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int pixels,
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int Bpp) const {
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if (Bpp == 8) {
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for (int i = 0; i < pixels; i++)
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*dest_buf++ = m_RampR[*(src_buf++)];
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} else if (Bpp == 24) {
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for (int i = 0; i < pixels; i++) {
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*dest_buf++ = m_RampB[*(src_buf++)];
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*dest_buf++ = m_RampG[*(src_buf++)];
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*dest_buf++ = m_RampR[*(src_buf++)];
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}
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} else {
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#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
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if (!m_pSrc->HasAlpha()) {
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for (int i = 0; i < pixels; i++) {
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*dest_buf++ = m_RampB[*(src_buf++)];
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*dest_buf++ = m_RampG[*(src_buf++)];
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*dest_buf++ = m_RampR[*(src_buf++)];
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dest_buf++;
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src_buf++;
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}
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} else {
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#endif
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for (int i = 0; i < pixels; i++) {
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*dest_buf++ = m_RampB[*(src_buf++)];
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*dest_buf++ = m_RampG[*(src_buf++)];
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*dest_buf++ = m_RampR[*(src_buf++)];
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*dest_buf++ = *(src_buf++);
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}
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#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
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}
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#endif
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}
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}
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