/* ======================================= PNG 文件读取 ======================================= */ CR_API sFMT_PIC* load_cr_png ( __CR_IO__ iDATIN* datin, __CR_IN__ const sLOADER* param ) { leng_t nbpl; leng_t sbpp; leng_t dptr; uint_t fcrh; uint_t index; uchar* image; uchar* sdata; uchar* ddata; leng_t dsize; int32u ssize; uint_t ww, hh; byte_t pal[768]; /* ----------- */ fsize_t fsze; sPNG_HDR head; sFMT_PIC* rett; sFMT_FRAME temp; /* 这个参数可能为空 */ if (datin == NULL) return (NULL); /* 读取 & 检查头部 */ if (!(CR_VCALL(datin)->geType(datin, &head, sPNG_HDR))) return (NULL); if (mem_cmp(&head, "\x89PNG\r\n\x1A\n\0\0\0\x0DIHDR", 16) != 0) return (NULL); if (head.info.compr != 0 || head.info.filter != 0 || head.info.interlace != 0) return (NULL); /* 对宽高的截断检查 */ if (cut_int32_u(&ww, DWORD_BE(head.info.w))) return (NULL); if (cut_int32_u(&hh, DWORD_BE(head.info.h))) return (NULL); /* 生成图片对象 */ mem_zero(temp.wh, sizeof(temp.wh)); switch (head.info.color) { case 0: /* 灰度图像 */ if (head.info.depth != 1 && head.info.depth != 2 && head.info.depth != 4 && head.info.depth != 8 && head.info.depth != 16) return (NULL); fcrh = CR_INDEX8; temp.fmt = CR_PIC_GREY; temp.bpp = head.info.depth; temp.clr = "I"; temp.wh[0] = head.info.depth; break; case 2: /* 真彩图像 */ if (head.info.depth != 8 && head.info.depth != 16) return (NULL); fcrh = CR_ARGB888; temp.fmt = CR_PIC_ARGB; temp.bpp = head.info.depth * 3; temp.clr = "BGR"; temp.wh[0] = head.info.depth; temp.wh[1] = head.info.depth; temp.wh[2] = head.info.depth; break; case 3: /* 索引图像 */ if (head.info.depth != 1 && head.info.depth != 2 && head.info.depth != 4 && head.info.depth != 8) return (NULL); fcrh = CR_INDEX8; temp.fmt = CR_PIC_PALS; temp.bpp = head.info.depth; temp.clr = "P"; temp.wh[0] = head.info.depth; break; case 4: /* α灰度图像 */ if (head.info.depth != 8 && head.info.depth != 16) return (NULL); fcrh = CR_ARGB8888; temp.fmt = CR_PIC_GREY; temp.bpp = head.info.depth * 2; temp.clr = "AI"; temp.wh[0] = head.info.depth; temp.wh[1] = head.info.depth; break; case 6: /* α真彩图像 */ if (head.info.depth != 8 && head.info.depth != 16) return (NULL); fcrh = CR_ARGB8888; temp.fmt = CR_PIC_ARGB; temp.bpp = head.info.depth * 4; temp.clr = "ABGR"; temp.wh[0] = head.info.depth; temp.wh[1] = head.info.depth; temp.wh[2] = head.info.depth; temp.wh[3] = head.info.depth; break; default: return (NULL); } sbpp = (temp.bpp - 1) / 8 + 1; temp.pic = image_new(0, 0, ww, hh, fcrh, FALSE, 4); if (temp.pic == NULL) return (NULL); /* 生成灰度调色板 */ if (temp.fmt == CR_PIC_GREY) pal_set_gray8(temp.pic->pal, 256); /* 分配 IDAT 的内存 */ fsze = dati_get_size(datin); if (fsze <= sizeof(sPNG_HDR) + sizeof(sIEND) * 2) goto _failure1; fsze -= sizeof(sPNG_HDR) + sizeof(sIEND) * 2; ddata = (byte_t*)mem_malloc64(fsze); if (ddata == NULL) goto _failure1; dsize = (leng_t)fsze; /* 读取数据块 */ dptr = 0; fcrh = 256; /* 这个保存调色板颜色数 */ do { /* 数据块大小 */ if (!(CR_VCALL(datin)->geType(datin, &head.info, sCHUNK))) goto _failure2; ssize = DWORD_BE(head.info.head.size); if (ssize > fsze) goto _failure2; if (head.info.head.name == mk_tag4("PLTE")) { /* 调色板, 安全检查 */ if (ssize > 768 || ssize % 3 != 0) goto _failure2; if (CR_VCALL(datin)->read(datin, pal, ssize) != ssize) goto _failure2; /* 转换到 4B 格式 */ fcrh = (uint_t)ssize / 3; pal_3b_to_4b_sw(temp.pic->pal, pal, fcrh); } else if (head.info.head.name == mk_tag4("IDAT")) { /* 检查缓冲溢出 */ if (dsize < ssize) goto _failure2; if (CR_VCALL(datin)->read(datin, ddata + dptr, ssize) != ssize) goto _failure2; dptr += ssize; dsize -= ssize; } else if (head.info.head.name == mk_tag4("tRNS")) { /* 透明数据 */ if (head.info.color == 0) { if (ssize != 2) goto _failure2; if (CR_VCALL(datin)->read(datin, pal, 2) != 2) goto _failure2; /* 调色板的这个颜色为透明色 */ if (head.info.depth != 16) temp.pic->pal[pal[1]] &= CDWORD_LE(0x00FFFFFFUL); } else if (head.info.color == 2) { if (ssize != 6) goto _failure2; if (CR_VCALL(datin)->read(datin, pal, 6) != 6) goto _failure2; /* 这个颜色为透明色, 这里只能展开来写 否则 C++Builder 2010 编译器编译时会崩溃 */ if (head.info.depth != 16) { temp.pic->keycolor = pal[1]; temp.pic->keycolor <<= 8; temp.pic->keycolor |= pal[3]; temp.pic->keycolor <<= 8; temp.pic->keycolor |= pal[5]; temp.pic->keycolor |= 0xFF000000UL; temp.pic->keycolor = DWORD_LE(temp.pic->keycolor); } } else if (head.info.color == 3) { if (ssize > fcrh) goto _failure2; if (CR_VCALL(datin)->read(datin, pal, ssize) != ssize) goto _failure2; /* 设置调色板的 Alpha 通道 */ for (fcrh = (uint_t)ssize, index = 0; index < fcrh; index++) ((uchar*)temp.pic->pal)[index * 4 + 3] = pal[index]; } else { goto _failure2; } } else { /* 跳过其他数据块 */ if (!CR_VCALL(datin)->seek(datin, ssize, SEEK_CUR)) goto _failure2; } /* 跳过 CRC-32 */ if (!CR_VCALL(datin)->seek(datin, 4, SEEK_CUR)) goto _failure2; } while (head.info.head.name != mk_tag4("IEND")); /* 无 IDAT 块 */ if (dptr == 0) goto _failure2; /* 分配带 filter 的图形内存 */ if (cut_mad(&dsize, ww, sbpp * hh, hh)) goto _failure2; sdata = (byte_t*)mem_malloc(dsize); if (sdata == NULL) goto _failure2; /* 解压图形数据 */ dptr = uncompr_zlib(sdata, dsize, ddata, dptr); mem_free(ddata); ddata = sdata; if (dptr <= hh) goto _failure2; image = temp.pic->data; /* 文件解码完毕, 解析图片的像素数据 */ if (temp.pic->fmt == CR_INDEX8) { switch (head.info.depth) { case 1: if (ww % 8 == 0) nbpl = ww / 8; else nbpl = ww / 8 + 1; if (!png_filter(ddata, nbpl, 1, hh, dptr)) goto _failure2; for (index = hh; index != 0; index--) { sdata = (uchar*)font1_h2l(image, sdata, ww); image += temp.pic->bpl; } break; case 2: if (ww % 4 == 0) nbpl = ww / 4; else nbpl = ww / 4 + 1; if (!png_filter(ddata, nbpl, 1, hh, dptr)) goto _failure2; for (index = hh; index != 0; index--) { sdata = (uchar*)font2_h2l(image, sdata, ww); image += temp.pic->bpl; } break; case 4: if (ww % 2 == 0) nbpl = ww / 2; else nbpl = ww / 2 + 1; if (!png_filter(ddata, nbpl, 1, hh, dptr)) goto _failure2; for (index = hh; index != 0; index--) { sdata = (uchar*)font4_h2l(image, sdata, ww); image += temp.pic->bpl; } break; case 8: nbpl = ww; if (!png_filter(ddata, nbpl, 1, hh, dptr)) goto _failure2; for (index = hh; index != 0; index--) { mem_cpy(image, sdata, nbpl); sdata += nbpl; image += temp.pic->bpl; } break; default: case 16: nbpl = ww; nbpl *= 2; if (!png_filter(ddata, nbpl, 2, hh, dptr)) goto _failure2; for (index = hh; index != 0; index--) { for (fcrh = 0; fcrh < ww; fcrh++, sdata += 2) image[fcrh] = sdata[0]; image += temp.pic->bpl; } break; } } else { nbpl = ww * sbpp; if (!png_filter(ddata, nbpl, sbpp, hh, dptr)) goto _failure2; nbpl = ww * temp.pic->bpc; switch (head.info.color) { case 2: if (head.info.depth == 8) { /* 直接逐行复制 */ for (index = hh; index != 0; index--) { for (dsize = 0; dsize < nbpl; dsize += 3) { image[dsize + 0] = sdata[2]; image[dsize + 1] = sdata[1]; image[dsize + 2] = sdata[0]; sdata += 3; } image += temp.pic->bpl; } } else { /* 跳开一个像素复制 */ for (index = hh; index != 0; index--) { for (dsize = 0; dsize < nbpl; dsize += 3) { image[dsize + 0] = sdata[4]; image[dsize + 1] = sdata[2]; image[dsize + 2] = sdata[0]; sdata += 6; } image += temp.pic->bpl; } } break; case 4: if (head.info.depth == 8) { /* 直接逐行复制 */ for (index = hh; index != 0; index--) { for (dsize = 0; dsize < nbpl; dsize += 4) { image[dsize + 0] = sdata[0]; image[dsize + 1] = sdata[0]; image[dsize + 2] = sdata[0]; image[dsize + 3] = sdata[1]; sdata += 2; } image += temp.pic->bpl; } } else { /* 跳开一个像素复制 */ for (index = hh; index != 0; index--) { for (dsize = 0; dsize < nbpl; dsize += 4) { image[dsize + 0] = sdata[0]; image[dsize + 1] = sdata[0]; image[dsize + 2] = sdata[0]; image[dsize + 3] = sdata[2]; sdata += 4; } image += temp.pic->bpl; } } break; default: case 6: if (head.info.depth == 8) { /* 直接逐行复制 */ for (index = hh; index != 0; index--) { for (dsize = 0; dsize < nbpl; dsize += 4) { image[dsize + 0] = sdata[2]; image[dsize + 1] = sdata[1]; image[dsize + 2] = sdata[0]; image[dsize + 3] = sdata[3]; sdata += 4; } image += temp.pic->bpl; } } else { /* 跳开一个像素复制 */ for (index = hh; index != 0; index--) { for (dsize = 0; dsize < nbpl; dsize += 4) { image[dsize + 0] = sdata[4]; image[dsize + 1] = sdata[2]; image[dsize + 2] = sdata[0]; image[dsize + 3] = sdata[6]; sdata += 8; } image += temp.pic->bpl; } } break; } } mem_free(ddata); /* 返回读取的文件数据 */ rett = struct_new(sFMT_PIC); if (rett == NULL) goto _failure1; rett->frame = struct_dup(&temp, sFMT_FRAME); if (rett->frame == NULL) { mem_free(rett); goto _failure1; } CR_NOUSE(param); rett->type = CR_FMTZ_PIC; rett->count = 1; rett->infor = "Portable Network Graphics (PNG)"; return (rett); _failure2: mem_free(ddata); _failure1: image_del(temp.pic); return (NULL); }
/* ======================================= TGL CGR 文件读取 ======================================= */ CR_API sFMT_PIC* load_tgl_cgr ( __CR_IO__ iDATIN* datin, __CR_IN__ const sLOADER* param ) { int32u wnh[2]; uint_t ww, hh; /*************/ byte_t* line; fsize_t size; sFMT_PIC* rett; sFMT_FRAME temp; /* 这个参数可能为空 */ if (datin == NULL) return (NULL); /* 只能根据文件大小来判断 */ size = dati_get_size(datin); if (size <= 0x600 + 12) return (NULL); if (!CR_VCALL(datin)->seek(datin, 0x600, SEEK_SET)) return (NULL); if (CR_VCALL(datin)->read(datin, wnh, 8) != 8) return (NULL); wnh[0] = DWORD_LE(wnh[0]); wnh[1] = DWORD_LE(wnh[1]); size = wnh[0]; size *= wnh[1]; size += 0x600 + 12; if (size != dati_get_size(datin)) return (NULL); /* 对宽高的截断检查 */ if (cut_int32_u(&ww, wnh[0])) return (NULL); if (cut_int32_u(&hh, wnh[1])) return (NULL); /* 定位到调色板 */ if (!CR_VCALL(datin)->rewind(datin)) return (NULL); /* 生成图片对象 */ mem_zero(temp.wh, sizeof(temp.wh)); temp.fmt = CR_PIC_PALS; temp.bpp = 8; temp.clr = "P"; temp.wh[0] = 8; temp.pic = image_new(0, 0, ww, hh, CR_INDEX8, FALSE, 4); if (temp.pic == NULL) return (NULL); /* 读取调色板数据 */ if (CR_VCALL(datin)->read(datin, temp.pic->pal, 1024) != 1024) goto _failure; line = temp.pic->data; pal_4b_alp_sw(temp.pic->pal, TRUE, 0xFF, 256); /* 定位到图片数据 */ if (!CR_VCALL(datin)->seek(datin, 0x600 + 12, SEEK_SET)) goto _failure; /* 读取图片数据 */ for (; hh != 0; hh--) { if (CR_VCALL(datin)->read(datin, line, ww) != ww) goto _failure; line += temp.pic->bpl; } /* 返回读取的文件数据 */ rett = struct_new(sFMT_PIC); if (rett == NULL) goto _failure; rett->frame = struct_dup(&temp, sFMT_FRAME); if (rett->frame == NULL) { mem_free(rett); goto _failure; } CR_NOUSE(param); rett->type = CR_FMTZ_PIC; rett->count = 1; rett->infor = "TGL CGR Image File (CGR)"; return (rett); _failure: image_del(temp.pic); return (NULL); }