1 // Copyright 2014 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #include "core/fxcodec/codec/ccodec_bmpmodule.h" 8 9 #include "core/fxcodec/codec/codec_int.h" 10 #include "core/fxcodec/fx_codec.h" 11 #include "core/fxcodec/lbmp/fx_bmp.h" 12 #include "core/fxge/fx_dib.h" 13 14 struct FXBMP_Context { 15 bmp_decompress_struct_p bmp_ptr; 16 void* parent_ptr; 17 18 void* (*m_AllocFunc)(unsigned int); 19 void (*m_FreeFunc)(void*); 20 }; 21 extern "C" { 22 static void* bmp_alloc_func(unsigned int size) { 23 return FX_Alloc(char, size); 24 } 25 static void bmp_free_func(void* p) { 26 FX_Free(p); 27 } 28 }; 29 static void bmp_error_data(bmp_decompress_struct_p bmp_ptr, 30 const FX_CHAR* err_msg) { 31 FXSYS_strncpy((char*)bmp_ptr->err_ptr, err_msg, BMP_MAX_ERROR_SIZE - 1); 32 longjmp(bmp_ptr->jmpbuf, 1); 33 } 34 static void bmp_read_scanline(bmp_decompress_struct_p bmp_ptr, 35 int32_t row_num, 36 uint8_t* row_buf) { 37 FXBMP_Context* p = (FXBMP_Context*)bmp_ptr->context_ptr; 38 CCodec_BmpModule* pModule = (CCodec_BmpModule*)p->parent_ptr; 39 pModule->GetDelegate()->BmpReadScanline(row_num, row_buf); 40 } 41 static bool bmp_get_data_position(bmp_decompress_struct_p bmp_ptr, 42 uint32_t rcd_pos) { 43 FXBMP_Context* p = (FXBMP_Context*)bmp_ptr->context_ptr; 44 CCodec_BmpModule* pModule = (CCodec_BmpModule*)p->parent_ptr; 45 return pModule->GetDelegate()->BmpInputImagePositionBuf(rcd_pos); 46 } 47 48 CCodec_BmpModule::CCodec_BmpModule() { 49 memset(m_szLastError, 0, sizeof(m_szLastError)); 50 } 51 52 CCodec_BmpModule::~CCodec_BmpModule() {} 53 54 FXBMP_Context* CCodec_BmpModule::Start() { 55 FXBMP_Context* p = FX_Alloc(FXBMP_Context, 1); 56 if (!p) 57 return nullptr; 58 59 FXSYS_memset(p, 0, sizeof(FXBMP_Context)); 60 if (!p) 61 return nullptr; 62 63 p->m_AllocFunc = bmp_alloc_func; 64 p->m_FreeFunc = bmp_free_func; 65 p->bmp_ptr = nullptr; 66 p->parent_ptr = (void*)this; 67 p->bmp_ptr = bmp_create_decompress(); 68 if (!p->bmp_ptr) { 69 FX_Free(p); 70 return nullptr; 71 } 72 p->bmp_ptr->context_ptr = (void*)p; 73 p->bmp_ptr->err_ptr = m_szLastError; 74 p->bmp_ptr->bmp_error_fn = bmp_error_data; 75 p->bmp_ptr->bmp_get_row_fn = bmp_read_scanline; 76 p->bmp_ptr->bmp_get_data_position_fn = bmp_get_data_position; 77 return p; 78 } 79 80 void CCodec_BmpModule::Finish(FXBMP_Context* ctx) { 81 if (ctx) { 82 bmp_destroy_decompress(&ctx->bmp_ptr); 83 ctx->m_FreeFunc(ctx); 84 } 85 } 86 int32_t CCodec_BmpModule::ReadHeader(FXBMP_Context* ctx, 87 int32_t* width, 88 int32_t* height, 89 bool* tb_flag, 90 int32_t* components, 91 int32_t* pal_num, 92 uint32_t** pal_pp, 93 CFX_DIBAttribute* pAttribute) { 94 if (setjmp(ctx->bmp_ptr->jmpbuf)) { 95 return 0; 96 } 97 int32_t ret = bmp_read_header(ctx->bmp_ptr); 98 if (ret != 1) { 99 return ret; 100 } 101 *width = ctx->bmp_ptr->width; 102 *height = ctx->bmp_ptr->height; 103 *tb_flag = ctx->bmp_ptr->imgTB_flag; 104 *components = ctx->bmp_ptr->components; 105 *pal_num = ctx->bmp_ptr->pal_num; 106 *pal_pp = ctx->bmp_ptr->pal_ptr; 107 if (pAttribute) { 108 pAttribute->m_wDPIUnit = FXCODEC_RESUNIT_METER; 109 pAttribute->m_nXDPI = ctx->bmp_ptr->dpi_x; 110 pAttribute->m_nYDPI = ctx->bmp_ptr->dpi_y; 111 pAttribute->m_nBmpCompressType = ctx->bmp_ptr->compress_flag; 112 } 113 return 1; 114 } 115 116 int32_t CCodec_BmpModule::LoadImage(FXBMP_Context* ctx) { 117 if (setjmp(ctx->bmp_ptr->jmpbuf)) 118 return 0; 119 return bmp_decode_image(ctx->bmp_ptr); 120 } 121 122 uint32_t CCodec_BmpModule::GetAvailInput(FXBMP_Context* ctx, 123 uint8_t** avail_buf_ptr) { 124 return bmp_get_avail_input(ctx->bmp_ptr, avail_buf_ptr); 125 } 126 127 void CCodec_BmpModule::Input(FXBMP_Context* ctx, 128 const uint8_t* src_buf, 129 uint32_t src_size) { 130 bmp_input_buffer(ctx->bmp_ptr, (uint8_t*)src_buf, src_size); 131 } 132
